Purification de l’eau dans l’industrie
Enrico Riboni
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Remerciements Ce livre est issus des cours Pr Pratiqu atiques es et ´economie economie de la purification purification de l’eau l’eau dans l’industrie organis´es es par p ar la Fondation Suisse pour p our la Recherche Re cherche en Microtechnique. Ces Ce s cours de formation continue s’adressent a` des praticiens de l’industrie. Tout comme ces cours, le pr´esent esent livre ne s’adresse donc pas a` des personne per sonness ayant d´ej` ej` a des connaissances connaissances approfondies en chimie de l’eau ou en traitement de l’eau, mais a` des ing´enieurs enieurs et techniciens technic iens ayant des de s bases techniques techniqu es g´en´ en´erales erale s mais m ais pas de connaissanc conna issances es particuli` part iculi`eres eres concernant l’eau : ce livre constitue une introduction a` ce domaine. Depuis 1997, je donne do nne ces c es cours co urs en coop´ co op´eration erat ion avec Madame M adame Uta Moersche Mo erschell, ll, Ing´enieur enieu r Chimiste Chimiste Diplˆ om´ om´e de la Haute Hau te Ecol Ec olee sp´ecia ec ialis lis´´ee ee de N¨ urenberg. urenberg. Mes remerciements vont donc tout naturellement a` Madame Uta Moerschell, qui a beaucoup bea ucoup contribu´ contrib u´e au d´eveloppement evelopp ement du cours c ours et en e n particu pa rticuliers liers a` ses chapitres relatifs a` la chimie de l’eau, `a la d´emin´ emi n´eralisa era lisatio tion n de l’ea l ’eau u et les l es ´etudes etu des de d e cas, ca s, et aussi aus si bien bi en sˆ sur ˆ `a la version allemande du cours. Je tiens aussi `a remercier Monsieur Fischer, responsable des cours de formation continue a` la Fondation Suisse pour la Recherche en Microtechnique, qui nous a permis p ermis de faire ces cours et nous a encourag´e a` les am´eliorer elior er continuellement. continuel lement. Mes remerciements vont aussi a` tous les participants des cours de purification de l’eau de la Fondation Suisse pour la Recherche en Microtechnique depuis 1997, qui, par leurs avis et propositions d’am´elioration elioration du cours nous ont permis p ermis d’am´eliorer eliorer le cours et ont donc une part de m´erite erite significative pour ce qui est de la qualit´e du pr´esent esent ouvrage.
L’auteur Ing´ In g´enie en ieur ur m´ecan ec anic icie ien n dipl di plˆ om´ oˆm´e de l’Ecol l’E colee Polytechn Polyt echnique ique F´ed´ ed´erale era le de Lausan Lau sanne, ne, Enrico Enr ico Riboni a acquis sont exp´ erience erience de traitement traitement de l’eau d’abord en travaillan travaillantt comme chef de projet pro jet aupr`es es d’un grand bureau d’ing´enieurs-conseils, enieurs-conseils, puis comme responsable de la filiale Europe Europ e et Moyen-Orient Moyen-Orient d’un fabriquant de mat´eriel eriel de traitement de l’eau pour l’industrie (Osmonics). (Osmon ics). Enrico Riboni est actuellement act uellement g´erant erant de ozone.ch (Boudry, Suisse). Suisse ). Cette soci´ soc i´et´ et´e propose prop ose des services servic es d’ing´enieurs-co enieu rs-conseil nseil et des produits pro duits innovants pour le traitement de l’eau et l’utilisation de l’ozone.
Version Versio n et dispo disponibi nibilit´ lit´e Vous avez entre entr e vos mains mai ns la version vers ion 21.2 21. 2 de ce livre. livr e. Elle Ell e a ´et´ et´e pr´epar´ epa r´ee ee en d´ecembre ece mbre 2002 et am´elior´ elior´ee ee en mars 2003. Des versions futures sont pr´evues. evues. Le manuel est disponible pon ible gratuiteme grat uitement nt en e n t´el´ el´echargement echarg ement en format forma t PDF a` partir du site de ozone.ch : http ://www.ozone.ch. La version imprim´ee ee peut ˆetre etre obtenue contre une participation forfaitaire aux frais d’impression et d’envoi de CHF 100.00 (Suisse) EUR 70.00 (Union Europ´eenne). eenne). Format : classeur A4, noir et blanc. Conditions sp´eciales eciales pour clients de particip´e a` un cours FSRM sur la purification de l’eau sur ozone.chet ceux qui ont particip´ demande.
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Copyright c Enrico Enric o Riboni, Rib oni, Ch´ezard-Saintezar d-Saint-Marti Martin, n, Suisse, Suisse , 1997-2003. 1997- 2003. Le manuel peut pe ut ˆetre etre utilis´e librement librement pour un usage en enseignement enseignement,, entreprise entreprise et en cadre priv´e. e. Il ne peut en aucun auc un cas ˆetre etr e propo pro pos´ s´e a` la vente, sauf par Enrico Riboni, ozone.chet la Fondation Suisse pour la Recherche en Microtechnique.
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Tabl able des des mati` ati` eres
I. In Intr trodu oduct ctio ion n et et rap rappel pelss
1
1. Introdu Introducti ction on 1.1. L’eau : aussi au ssi omnipr´ o mnipr´esente esente que m´econnue econnue . . . . . . . . . . . . . . . . . . 1.2. Rappe Rappell histor historiqu iquee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3. Tendances actuell actuelles es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 2 4 5
2. Introduction `a la chimie de l’eau 2.1. Qu’ Qu’estest-ce ce que l’e l’eau au ? . . . . . . . . . . . . . . . . 2.2. Les class classes es de polluan polluants ts . . . . . . . . . . . . . . . 2.3. Une classifica classification tion alternati alternative ve . . . . . . . . . . . . 2.3.1. Poll Polluants uants primai primaires res . . . . . . . . . . . . . 2.3.2. Poll Polluants uants secondai secondaires res . . . . . . . . . . . . 2.3.3. Poll Polluants uants tertiair tertiaires es . . . . . . . . . . . . . 2.3. 2. 3.4. 4. Les tra traces ces . . . . . . . . . . . . . . . . . . 2.3.5. 2.3. 5. Com Composan posants ts non non permanen permanents ts . . . . . . . . 2.4. Les unit´es es de mesure mesur e . . . . . . . . . . . . . . . . 2.4.1. Unit Unit´´es es de mesure des substances dissoutes 2.4.2. Unit Unit´´es es de mesure des solides en suspension 2.4.3.. Duret´e . . . . . . . . . . . . . . . . . . . . 2.4.3 2.5. pH, acid acides es et base basess . . . . . . . . . . . . . . . . . 2.6. Oxydo Oxydo-r´ -r´eduction educt ion . . . . . . . . . . . . . . . . . . 2.7. Conductivit´e de l’eau . . . . . . . . . . . . . . . . 2.8. Dissolution et pr´ecipitation ecipitation . . . . . . . . . . . . . 2.9. L’´equilibre equilibre calco-carbonique calco-carb onique de l’eau . . . . . . . 3. Les polluan polluants ts dans dans l’eau 3.1. In Introdu troductio ction n . . . . . 3.2. 3. 2. Cal Calci cium um – Ca++ . . 3.3. Magn´esium esium – Mg ++ . 3.4. Bic Bicarbon arbonate ate – HCO HCO3 ++ +++ 3.5. Fer – Fe , Fe . 3.6. 3. 6. Si Sili li SiO Si O −
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21 . . . . . 21 . . . . . 21 . . . . . 21 . . . . . 21 . . . . . 21 22
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Table des mati` mat i` eres ere s
3.7. Gaz carbo carboniq nique ue – CO2 3.8. 3. 8. Ch Chlor loree . . . . . . . . . 3.9. Trihalo rihalom´ m´ethanes ethan es . . . 3.10. Que faut-il analyser analyser ? .
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II. Le Less tec techno hnolog logies ies de la pur purific ificati ation on de l’e l’eau au 4. Filtration Filtration et microfiltra microfiltration tion 4.1. Quelques d´efinitions efinitions . . . . . . . . . . . . 4.2. Filtrat Filtration ion particul particulaire aire . . . . . . . . . . . . 4.2. 4. 2.1. 1. Po Pourq urquo uoii filt filtrer rer ? . . . . . . . . . . 4.2.2. Les m´ecanismes ecanismes de filtration . . . . 4.2.3. 4.2 .3. Ty Types pes de filtr filtres es . . . . . . . . . . . 4.2. 4. 2.4. 4. Fi Filtr ltres es a` cartouches consommables 4.3. Mic Microfil rofiltrat tration ion . . . . . . . . . . . . . . . .
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22 22 23 23
26 . . . . . . .
5. Proc Pr oc´ ´ ed´es ed´ es me membra mbranai naire ress 5.1. In Introdu troductio ction n . . . . . . . . . . . . . . . . . . . . . . 5.2. Osm Osmose ose in inve verse rse . . . . . . . . . . . . . . . . . . . . 5.2.1. 5.2 .1. Pri Principe ncipe de l’osm l’osmose ose inve inverse rse . . . . . . . . . 5.2.2. Equatio Equations ns fondamenta fondamentales les de l’osmos l’osmosee inverse inverse 5.2.3. Exemples d’unit´es es d’osmose inverse . . . . . 5.3. Ult Ultrafil rafiltrat tration ion . . . . . . . . . . . . . . . . . . . . . 5.4. Nan Nanofilt ofiltrati ration on . . . . . . . . . . . . . . . . . . . . .
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6. La maintenance maintenance des osmoseur osmoseurss 6.1. Sui Suivi vi des des performa performances nces . . . . . . . . . . . . . . . . . . . . . 6.1.1.. Param`etres 6.1.1 etre s a` enregistrer . . . . . . . . . . . . . . . . 6.1.2.. Param`etres 6.1.2 etre s a` calculer sur la base des enregistrements 6.2. Netto Nettoyage yage des memb membranes ranes . . . . . . . . . . . . . . . . . . .
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27 . . . . 27 . . . . 27 . . . . 27 . . . . 28 . . . . 31 . . . . 37 . . . . 42
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7. La d´ esinfection de l’eau esinfection
62
8. St´ erili sation U.V. erilisation 8.1. Principe et limit limites es de la d´esinfection esinfection par ultra ultraviolets violets . . . . . . . . . . . 8.1.1. 8.1 .1. Pri Principe ncipe de fonct fonctionn ionnemen ementt . . . . . . . . . . . . . . . . . . . . 8.1.2. Limites de la st´erilisation erilisation par ultraviolet . . . . . . . . . . . . . 8.1.3. 8.1 .3. Long Longueur ueur d’on d’onde de . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1.4. 8.1 .4. Les lam lampe pe ultrav ultraviol iolet et . . . . . . . . . . . . . . . . . . . . . . . . 8.2. Dimensionnement d’un st´erilisateur erilisateur UV . . . . . . . . . . . . . . . . . . 8.2.1. 8.2 .1. Dos Dosee de rayonne rayonnemen mentt UVc . . . . . . . . . . . . . . . . . . . . . 8.3. Doses de rayonnement UV pour diff´erentes erentes classes de micro-organismes micro-organ ismes 8.3.1. Exemples d’estimations de la dose n´ ecessaire ecessaire
63 63 63 63 64 64 65 65 67 69
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Table des de s mati` mat i`eres ere s
8.3.2. 8.3. 2. Biodo Biodosim simetri etriee ou cal calcul cul ? . . . . . . . . . . . . . . . . . . . . . . .
70
9. Chlo Chloratio ration n
73
10.Ozonisation 10.1. Principe . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1.1. 10.1. 1. D´esavantages esavantages de l’ozon l’ozonee . . . . . . . . . . . . . 10.1.2. Avantages de l’ozone . . . . . . . . . . . . . . . 10.1.3 10. 1.3.. Potent Po tentiels iels R´edox edox . . . . . . . . . . . . . . . . . 10.1.4 10. 1.4.. Mat´eriaux eri aux r´esista esi stants nts a` l’ozone . . . . . . . . . . 10.2. Dosage d’ozone . . . . . . . . . . . . . . . . . . . . . . 10.3. 10. 3. Syst` Sys t`emes eme s de m´elange ela nge ozo ozone ne - eau . . . . . . . . . . . . 10.3.1. Colonnes de contact et injecteurs Venturi . . . . 10.3.2. Transfert de masse . . . . . . . . . . . . . . . . 10.3.3. Conclusion sur la dissolution de l’ozone . . . . . 10.3.4. Destruction de l’ozone r´esiduel esiduel en phase liquide 10.3.5. Destruction de l’ozone r´esiduel esiduel en phase gazeuse 10.3.6. Ozone : dimensionnement . . . . . . . . . . . . 10.3.7. Ozone a` partir p artir de l’oxyg`ene ene de l’eau . . . . . . . 10.4. Mesure de l’ozone dans l’air . . . . . . . . . . . . . . . 10.4.1 10. 4.1.. Colo C olorim´ rim´etrie etr ie . . . . . . . . . . . . . . . . . . . . 10.4.2. 10.4. 2. Sonde Sondess ´electrochi elect rochimiques miques . . . . . . . . . . . . . 10.4.3. Capteurs a` semicon semiconducteurs ducteurs . . . . . . . . . . . 10.4.4. Analyseurs d’ozone . . . . . . . . . . . . . . . . 10.4.5. 10.4. 5. Compa Comparaiso raison n des m´ethodes etho des . . . . . . . . . . . 10.4.6. Etude de cas : mesure de l’ozone dans l’air . . . 10.5. Mesure de l’ozone dans l’eau . . . . . . . . . . . . . . . 10.5.1. 10.5. 1. M´ethodes etho des disp disponible onibless . . . . . . . . . . . . . . . 10.5.2 10. 5.2.. Colo C olorim´ rim´etrie etr ie . . . . . . . . . . . . . . . . . . . . 10.5.3. 10.5. 3. Mesur Mesuree du pot potentiel entiel R´edox edox . . . . . . . . . . . . 10.5.4. 10.5. 4. Sonde Sondess ´electrochi elect rochimiques miques . . . . . . . . . . . . . 10.5.5. Capteurs a` semicon semiconducteurs ducteurs . . . . . . . . . . . 10.5.6. Analyseurs d’ozone . . . . . . . . . . . . . . . .
74 74 74 74 75 77 78 79 79 83 87 87 88 89 89 90 91 91 91 92 93 94 95 95 95 95 95 96 96
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Table des mati` mat i` eres ere s
11.2.2. U Une ne unit unit´´e de potabilis potabilisation ation pour r´eseau esea u d’eau pot potable able . . . . . . . 11.2.3. 11. 2.3. Un Un poin pointt d’ea d’eau u potab potable le dans un r´ese seaau ´ele lect ctri riqu quee . . . . . . . . . 11.2.4. Installation de chloration de l’eau 11.2.5. Eau ultrapure, micro-´electronique electronique
maison sans raccordem raccordement ent au . . . . . . . . . . . . . . . . . . 99 endroit endr oit qui n’es n’estt pas rel reli´ i´ e au . . . . . . . . . . . . . . . . . . 101 . . . . . . . . . . . . . . . . . . 101 . . . . . . . . . . . . . . . . . . 101
12.Les biofilms 12.1. Importance des biofilms . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2. Qu’estQu’est-ce ce qu’un biofilm ? . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3. Les facteurs influen¸cant cant la formation et le d´eveloppement eveloppement des biofilm . 12.3.1. Temps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3.2. 12.3. 2. Vitess Vitessee d’´ecoulement ecoul ement . . . . . . . . . . . . . . . . . . . . . . . . 12.3.3. Espaces morts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.3.4 12. 3.4.. Bar Barri` ri`eres ere s anti antibac bact´ t´erienn eri ennes es . . . . . . . . . . . . . . . . . . . . . 12.4. Contrˆ ole des biofilms . . . . . . . . . . . . . . . . . . . . . . . . . . . . ole 12.5. D´esinfection esinfe ction d’inst d’installati allations ons lors de l’insta l ’installatio llation n d’un d’ un st´ s t´erilisateur erilisa teur U.V . 12.5.1. Un cas particulier : les boucles de distribution d’eau ultrapure . 12.6. Biofilms et corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.. L’e 13 L’eau au oz ozon´ on´ee ee 13.1. Pourquoi Pourqu oi l’eau ozon´ee ee ? . . . . . . . . . . . 13.2. Applications . . . . . . . . . . . . . . . . . 13.3. 13. 3. S´ecurit´ ecu rit´e lor lorss de l’e l’empl mploi oi d’e d’eau au ozo ozon´ n´ee ee . . . 13.3.1 13. 3.1.. Pro Probl` bl`emes eme s sp´ecifiqu eci fiques es a` l’util l’utilisatio isation n 13.3.2. Effets de l’ozone . . . . . . . . . . . 13.3.3. Les mesures de pr´ecaution ecaution . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . d’eau ozon´ee ee . . . . . . . . . . . . . . . .
14.La distillation 14.1. Applications . . . . . . . . . . . . . . . . . . . . . 14.2. Principe Principe de fonction fonctionnemen nementt . . . . . . . . . . . . 14.3. 14. 3. Qual Q ualit´ it´e de l’ea l’eau u dist distill´ ill´ee ee . . . . . . . . . . . . . . 14.4. Solution So lutionss pou pourr r´eduire eduir e la conso consommatio mmation n d’´energie ener gie 14.4.1. Effets multiples . . . . . . . . . . . . . . . 14.4.2. Thermocompr Thermocompression ession
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102 102 102 102 102 103 103 103 103 104 105 106
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108 108 108 109 109 110 110
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112 112 112 112 114 114 114
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Table des de s mati` mat i`eres ere s
15.3.4 15. 3.4.. Pourquo Pour quoii l’ea l ’eau u este st-elle elle mei meille lleure ure apr`es es un lit m´elang´ ela ng´e qu’a qu’apr` pr`es es un deux-li deux -lits ts ? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.3.5. R´eg´en´eratio ion n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4. Calcul Ca lcul des ´echangeurs echang eurs d’ions . . . . . . . . . . . . . . . . . . . . . . . . . 15.4 15 .4.1 .1.. Pr Prin inci cip p es g´en´ en´erau er aux x . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4.2. 15.4. 2. Qualit´e de l’eau obtenue par ´echange echange d’ion d’ionss . . . . . . . . . . . .
119 119 120 120 120
16.Les 16. Les anti antitartre tartress ´ ele ctromagn´ electro magn´etique eti quess 121 16.1. Passion Passionss et pol´emique emiqu e . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 16.2. Principe Principe de fonction fonctionnemen nementt . . . . . . . . . . . . . . . . . . . . . . . . . 121 16.3. Limitations d’emploi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 17.Ele 17. Electro ctrod´ d´ eio nisati eionis ation on 17.1. Principe . . . . . . . . . . . . . . . . . . . . 17.2. Avantages et d´esavantages esavantages . . . . . . . . . . 17.2.1. Principaux avantages . . . . . . . . . 17.2.2. 17.2. 2. Princ Principaux ipaux d´esavantages esavantages . . . . . . . 17.3. Prob Probl` l`emes emes r´esultants esult ants d’asp d’aspects ects comme commerciau rciaux x 17.4. Etudes de cas . . . . . . . . . . . . . . . . . 17.4.1. L’osmoseur instable . . . . . . . . . . 17.4.2. 17.4. 2. Cellul Cellulee myst´erieuse erieu se . . . . . . . . . . 17.5. Situation Situation actuell actuellee . . . . . . . . . . . . . . .
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18.. D´egaz 18 eg azag age e 18.1. Applications . . . . . . . . . . . . . . . . . . . . 18.2. La technologie traditionelle : le d´ecarbonateur ecarbonat eur . 18.2.1. Principe . . . . . . . . . . . . . . . . . . 18.2.2. Le dimensionnement des d´ecarbonateurs ecarbonat eurs 18.3. Les nouvelles technologies de d´egazage egazage . . . . . 18.3.1. Principe de fonctionnement . . . . . . . 18.3.2. Calcul . . . . . . . . . . . . . . . . . . .
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III. Con Concep ceptio tion n et opt optimi imisat sation ion de sys syst` t` emes de pur emes purific ificati ation on de l’eau 133
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Table des mati` mat i` eres ere s
19. 6. Qua 19.6. Quantit´ ntit´e d’e d’eau au n´ecessa ece ssaire ire . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 19.7. 19. 7. Autres Autr es par param` am`etres etr es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 19.8 19 .8.. Conc Co ncep epti tion on du pr proo c´ed´ ed´e . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
20.. Sp´ecifi 20 ec ifica cati tion on de dess pri princ ncip ipau auxx ´ el´emen el´ em ents ts 20.1. Introducti Intro duction on aux sp´ecification ecific ationss . . . . . . . . . 20.2. Osmose inverse . . . . . . . . . . . . . . . . . 20.3. Echangeurs Echangeurs d’ions . . . . . . . . . . . . . . . . 20.4 20 .4.. G´en´ en´erat er ateu eurs rs d’ d’oz ozon onee . . . . . . . . . . . . . . 20.5. Distillateurs . . . . . . . . . . . . . . . . . . . 20.6. Elect Electro rod´ d´eionisation eionis ation . . . . . . . . . . . . . . . 20.7. Sp´ecification ecification des filtres et cartouches filtrantes 20.7.1. 20.7. 1. Carto Cartouches uches de p´efiltration efiltr ation . . . . . . . 20.7.2. Cartouches de microfiltration . . . . . 20.7.3. D´ebits ebits : ordres de grandeur . . . . . .
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21.Optimis 21. Optimisation ation de syst`emes emes exista existants nts 21.1 21 .1.. M´ M ´etho et hode de . . . . . . . . . . . . . . . . . . . . . . . . . . 21.2. Osmoseurs : optimisation de la maintenance . . . . . . 21.3. Cartouches filtrantes . . . . . . . . . . . . . . . . . . . 21.4. Etude de cas : cartouche c artouche de pr´efiltration efiltration d’un osmoseur 21.5. Osmose Osmoseur ur en pr´etraiteme etra itement nt d’´echange echange d’ion . . . . . . . 21.6. 21. 6. Cap Capaci acit´ t´e des r´esines esi nes d’´echange echa ngeurs urs d’i d’ions ons . . . . . . . .
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141 141 141 142 142 143 143 144 144 144 144
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145 145 145 145 145 146 147
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Table des figures 1.1. Le traiteme traitement nt de l’eau, l’eau, un sujet sujet a` la fronti`ere ere de plusieurs disciplines . . . 1.2. Les dom domaine ainess du traitemen traitementt de l’eau . . . . . . . . . . . . . . . . . . . .
3 3
2.1. La mol´ecule ecule d’eau . . . . . . . . . . . . . . . . . . . . . . 2.2. Classification des impuret´es es . . . . . . . . . . . . . . . . 2.3. Conducti Conductivit´ vit´ e de l’eau en fonction de la concentration de (TDS). [12 [12]] . . . . . . . . . . . . . . . . . . . . . . . . . 2.4. Le gaz carboni carbonique que dans dans l’eau l’eau . . . . . . . . . . . . . . . . 2.5. Nom Nomogra ogramme mme de Langelie Langelierr et Ryz Ryznard nard[[12 12]] . . . . . . . . 2.6. Interpr´etation etation de l’indice de Ryznar[ Ryznar[12 12]] . . . . . . . . . .
7 7
. . . . . . . . . . . . . . . . . . solidess dissous solide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15 16 18 20
3.1. 3. 1. Le CO2 dans l’eau, sous sou s diff´ d iff´erentes erentes formes f ormes en fonction du pH . . . . . . .
23
4.1. 4.2. 4.3. 4.4. 4.5. 4.6. 4. 6.
29 29 30 30 32
Intercepti Interc eption on directe directe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mouvement Mouve ment brown brownien ien . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adsorpt Ads orption ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . La format formation ion d’un d’un gˆ gateau aˆteau de filtration . . . . . . . . . . . . . . . . . . . Principe Prin cipe de fonctionne fonctionnemen mentt d’un filtre a` poche . . . . . . . . . . . . . . . Change Cha ngeme ment nt d’ d’un unee poch poche. e. Ce Cess poch poches es peu peuve vent nt se cas casse ser, r, cau causa sant nt des d´egats aˆts importants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7. Filtre autonettoy autonettoyant. ant. Principe Principe de fonctionnement. fonctionnement. Image Image : Filters Srl . . 4.8. Filtre autonetto autonettoyan yant. t. Photo : Filters Filters Srl Srl . . . . . . . . . . . . . . . . . . 4.9. Montag Montagee d’un filtre autonettoy autonettoyant. ant. Photo Photo : Filters Srl Srl . . . . . . . . . . . 4.10. Filtre `a sable `a pression. Photo : Osmonics . . . . . . . . . . . . . . . . . 4.11. Corps de filtres pour filtres a` cartouche. Photo : Osmonics . . . . . . . . 4.12. Cartouche Cartouche a` fil b ob obin´ in´e
33 34 34 35 36 37 38
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Table des figures
5.4. Membrane d’osmose inverse : le mod` mo d`ele ele avec pores. pores. Image : Osmonics . . 47 5.5. Membrane d’osmose inverse : le mod` mo d`ele ele sans pores . . . . . . . . . . . . . 47 5.6. Repr´esentation esentat ion sch´ematique ematiq ue d’un d ’un osmoseu o smoseurr . . . . . . . . . . . . . . . . . 48 5.7. Sch´ema ema d’un petit osmoseur industriel. Sch´ ema : Osmonics . . . . . . . . 52 ema 5.8. Exemple d’unit´ d’unit´e d’osmos d’osmosee inv inverse erse pour p our laboratoir laboratoire. e. Photo : Electrol Electrolux ux . 53 5.9. Sch´ema ema de princ principe ipe de l’unit´e montr´ee ee sur la figure 5.8 . . . . . . . . . . 53 5.10. Osmoseur industriel de taille moyenne, muni de membranes 4”. Photo : Osmonics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.11. Exemple de grand osmoseur industriel, muni de membranes 8”. Photo : Osmonics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.12. Exemple d’unit´e d’ultrafiltration au point d’utilisation [20 20]] . . . . . . . . 55 5.13. Sch´ema ema d’une unit´e d’ultr d’ultrafiltr afiltration ation au poi point nt d’utilis d ’utilisation ation [20 20]] . . . . . . 56 5.14. Machine d’ultrafiltration pour la potabilisation de l’eau . . . . . . . . . . 56 8.1. Absorption Absorption du rayonnemen rayonnementt ultraviolet ultraviolet par l’eau et par l’ADN l’ADN . . . . . . 63 8.2. Comparaison des spectres d’´emission emission d’une lampe basse pression et d’une lampe moyenne pression [13 [13]] . . . . . . . . . . . . . . . . . . . . . . . . . 64 8.3. R´eduction educ tion du rayonnement rayonn ement ´emis emis au a u bout b out de d e 7 jours, j ours, en fonctio fo nction n de la duret´ dur et´e 65 8.4. Dose de rayonnement rayonne ment U.V. n´ecessaire eces saire pour p our r´eduire eduir e de 99.99% 99.99 % divers micromicro organismes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 8.5. Exemple de st´erilisateur erilisateur U.V. [23 [23]] . . . . . . . . . . . . . . . . . . . . . . 71 10.1. L’ozone : un d´esinfectant esinfectant plus puissant que le chlore [2 [2] . . . . . 10.2. Les principaux princ ipaux composants d’un syst`eme eme d’ozonisation de l’eau . 10.3. 10. 3. G´en´ en´eratio era tion n d’o d’ozon zonee par d´echarge echa rge Cor Corona ona.. Pri Princi ncipe pe . . . . . . . . 10.4. 10. 4. Exem E xemple ple de sys syst` t`eme eme de g´en´ en´eratio era tion n d’o d’ozon zonee . . . . . . . . . . . . 10.5. principe de fonctionnement d’une colonne de contact
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75 76 77 78 79
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Table des figures
10.20.Principe Principe de fonction fonctionnemen nementt d’un analys analyseur eur d’ozone utili utilisant sant la loi de Henry . Dessin : InUSA Corporation . . . . . . . . . . . . . . . . . . . . . 10.21..Analyseur 10.21 Analys eur d’ozone d’o zone `a mesure directe dans l’eau. Le capteur, a` travers lequel l’eau passe, est `a droite sur la photo. Photo : InUSA Corporation . . . .
97 97
11.1. Syst`eme eme compact d’ozonisation de l’eau [23 23]] . . . . . . . . . . . . . . . . 100 11.2. Syst`eme eme de potabilisation d’eau de pluie pour maison isol´ee ee [23 23]] . . . . . 1 0 0 12.1. Un Un biofilm biofilm.. Le biofilm est form´ e de micro-o micro-organism rganismes, es, mais aussi par un r´eseau ese au de po polym` lym`eres ere s extr e xtra-c a-cell ellula ulaire iress [21 [21]] . . . . . . . . . . . . . . . . . . 102 12.2. Contrˆ o le de bio ole biofil films ms [21 21]] . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 12.3. La corrosion favoris´ee ee par les biofilms. Principe P rincipe [21 21]] . . . . . . . . . . . . 107 13.1. Syst` S yst`eme eme por portable table de pro product duction ion d’eau ozon´ee ee [23 23]] . . . . . . . . . . . . . 109 13.2. Syst` Sys t`eme eme pou pourr refro r efroidisse idissement ment a` l’eau (Hydrocooling (Hydrocooling )) de viande de poulet, avec eau ozon´ee. ee. Image : GDT Corporation [23 23]] . . . . . . . . . . . . . . 110 14.1. Sch´ema ema de principe d’un distillateur [9] . . . . . . . . . . . . . . . . . . 113 14.2. Principe de la thermocompression [2 [2] . . . . . . . . . . . . . . . . . . . . 115 15.1. Sch´ema ema de principe d’un adoucisseur . . . . . . . . . . . . . . . . . . . . 118 16.1. 16. 1. Anti Antitar tartre tre ´electr ele ctroma omagn´ gn´etique eti que . . . . . . . . . . . . . . . . . . . . . . . . . 123 17. 1. Princi 17.1. Pri ncipe pe de l’´electr ele ctrod´ od´eionis eio nisati ation on . . . . . . . . . . . . . . . . . . . . . . . 124 17.2. 17. 2. Princip Prin cipee de d e l’´ l ’´electr ele ctrod´ od´eionis eio nisati ation( on(2) 2) . . . . . . . . . . . . . . . . . . . . . 125 17.3. 17. 3. Exe Exempl mplee d’´elecro ele crod´ d´eionis eio nisate ateur ur . . . . . . . . . . . . . . . . . . . . . . . . . 126 18.1. Sch´ S ch´ema ema de princ principe ipe d’un d´ecarbon ecar bonateu ateurr [8]
130
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Liste des tableaux 2.1. Facteurs de conversi conversion on pour les ions les plus courants courants . . . . . . . . . . . 2.2. Conversio Conversion n des d es degr´es es de dure duret´ t´e . . . . . . . . . . . . . . . . . . . . . . .
11 13
4.1. Seui Seuils ls de filtrati filtration on usuels usuels . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
5.1. Taux de rejets rejet s de diff´erents erents sels, relativement au NaCl . . . . . . . . . . .
50
6.1. D´ebits ebits et volumes de solution de nettoyage recommand´ re command´es es . . . . . . . . .
61
8.1. 8.2. 8.3. 8.4. 8.5. 8.6.
Doses d’inact d’inactiv ivation ation D10 pour quelqu quelques es micromicro-organism organismes es comm communs uns . . Doses de rayonnement UV pour pou r l’inactivation de bact´eries eries . . . . . . . Doses de rayonnemen rayonnementt UV pour l’inactivation l’inactivation de moisissures moisissures et spores . Doses de rayonnemen rayonnementt UV pour l’inactivation l’inactivation d’algues d’algues et protozoa . . . Doses de rayonnemen rayonnementt UV pour l’inactivation l’inactivation de virus . . . . . . . . . Doses de rayonnemen rayonnementt UV pour l’inactivation l’inactivation de levures levures . . . . . . . .
. . . . . .
67 68 69 69 69 70
10.1. Potentiels Potentie ls R´edox edox de quelques quelqu es prod p roduits uits oxydants utilis´es es dans l’indu l’industrie strie . 10.2. Demi-vie de l’ozone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
75 76
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Prem Premi` i` ere ere parti partie e. Introduction et rappels
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1. Intr Introduc oducti tion on 1.1. 1.1 . L’eau L’ea u : aussi auss i omnipr´ omni pr´ esente esente que m´ econnue econ nue L’eau est omnipr´esente esente dans l’industrie. Il n’y a pas de produit qui n’est pas au moins rinc´ rinc´e avec avec de l’eau l’eau au cours cours de sa productio production, n, et l’eau l’eau est un composan composantt essen essentiel tiel de la production pro duction de bien des produits alimentaires et chimiques, par exemple. Les qualit´es es thermodynamiques de l’eau en font un fluide caloporteur de choix : elle a une enthalpie d’´ d’ ´evap eva porati ra tion on tr` tr `es es ´elev el ev´´ee et un unee chal ch aleu eurr sp´ sp ´ecifi ec ifiqu quee tr` tr `es es ´elev´ le v´ee ee ´egale ga leme ment nt.. Pourtant, Pourta nt, le praticien prat icien confront´ confr ont´e a` la conception du syst`eme eme de traitement de l’eau pour p our l’industrie devait jusqu’`a pr´esent esent se tourner vers des ouvrages en anglais, ang lais, par ailleurs souvent excelle e xcellents, nts, ou se r´esoudre esoud re a` utiliser des ouvrages en fran¸cais cais destin´ desti n´es es au traitement trait ement de l’eau potable. Cette situation n’´etant etant pas satisfaisante, j’ai entrepris l’´ecriture ecriture de cet ouvrage, sur la base du cours qui existe depuis de puis 1997 aupr`es es de la FSRM et e t des nouveaux cours avanc´ avanc´es es de la FSRM introduits en 2002. Le traitement de l’eau est un domaine a` la fronti` ere ere de plusieurs disciplines. La chimie joue un rˆ ole ole primordial, mais aussi la m´ecanique ecanique et, e t, pour p our les installations d’une certaine importance, aussi le g´enie enie civil. civil. La conception conception d’une nouvelle nouvelle installation installation requiert requiert en principe la collaboration d’au moins un chimiste et un ing´enieur enieur en m´ecanique. ecanique.
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´ ´ 1.1. L’EAU L’EAU : AUSSI AUSSI OMNIPR OMNIPR ESENTE QUE M ECONNUE
Fig.
1.1.: Le traitement de l’eau, un sujet a` la fronti`ere ere de plusieurs disciplines
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CHAPITRE CHAPITRE 1. 1. INTRODUCT INTRODUCTION ION
de l’eau. Enfin, dans la 3e partie de l’ouvrage, nous mettrons en pratique les connaissances acquises pour la conception de nouvelles installation et l’analyse et l’optimisation d’installations existantes. Comme bien des branches industrielles, la purification de l’eau utilise des technologies parfois fort anciennes. Certaines, comme l’ozone, on connu un d´eveloppement eveloppement rapide avant avant de retomber retomber dans l’oubli, l’oubli, pour faire ensuite un retour en force a` une ´epoq ep oque ue tr`es es r´ecente. ece nte. D’autr D’a utres, es, comme com me l’osmo l’o smose, se, sont r´ecentes ece ntes,, ´etaient eta ient d’une d’u ne utilisation assez complexe mais se se sont aujourd’hui aujo urd’hui popularis´ p opularis´ees. ees. e La 3 partie de l’ouvrages l’ouvrages est consacr´ consacr´ee ee a` la conception de nouvelles installations et l’optimisati l’optimisation on d’installatio d’installations ns existantes. existantes. Ces sujets sont trait´es es du point de vue de l’utilisateur d’installation.
1.2. Rappel histo historique rique La s´edimentation edime ntation date de l’antiquit´ l’antiqui t´e classique class ique : des d es documents doc uments en grec d´ecrivent ecrivent des e techn te chniqu iques es empl em ploy´ oy´ees ee s dans da ns l’Egy l’E gypt ptee Ptol´ Pt ol´ema em a¨ıque ıqu e d´ej` eja` au 2 si`ecle ecl e avant notre not re ˆere. ere . La filtration filtration par tamisage tamisage avec avec un textile textile est encore plus ancienne : elle ´etait etait connue en e Gr`ece ece au 5 si`ecle ecle avant avant notre notr e ˆere. ere. Le filtre a` sable, qui est utilis´ utilis´e aujourd’hui aujourd’hui dans
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1.3. TENDANCES TENDANCES ACTUEL ACTUELLES LES
des installation instal lationss d’osmose d’osmo se inverse soient r´ealis´ ealis´ee ee a` l’´ l ’´echelle eche lle du labora lab oratoi toire. re. Les premi` pre mi`eres ere s installations industrielles datent des ann´ees ees 1960, et il faut f aut attendre les ann´ees ees 1980 pour la technologie se g´en´ en´eralise, eralise, d’abord aux USA puis en Europe.
1.3. Tendances endances actuelles actuelles Les ann ann´´ees ees 1990 ont ont vu une baisse baisse de prix des instal installat lations ions a` membrane (Osmose inverse) inverse) et des syst` syst`emes emes d’ozonisation d’ozonisation de l’eau, ce qui fait que ces technologies technologies sont de plus en plus fr´equemment equemment utilis´ees. ees. Cette p´eriode eriode a aussi vu des fournisseurs proposer des ´equipements equip ements stand s tandard, ard, sur su r catalogu cat alogue, e, a` des prix pri x tr`es es comp´ com p´etitif eti tifss aussi aus si pour po ur des d´ebits ebi ts 1 tr`es es import imp ortants ants . e La 2 moiti´e des ann´ees ees 1990 a aussi vu l’apparition de membranes d’osmose inverse a` pression plus faible, qui ont r´eduit eduit le coˆ c oˆ ut d’exploitation des osmoseurs de 20 `a 30%, ut favorisant ainsi encore une fois cette technologie. Les technol tech nologi ogies es membr m embrana anaire iress se sont s ont imp i mpos´ os´ees ees contre cont re la l a d´emin´ emi n´eralisa era lisatio tion n par pa r ´echange echa nge d’ions. d’ions. Un domaine domaine ou l’´ echange echange d’ions se maintien maintientt actuellement actuellement est l’adoucissemen l’adoucissementt de l’eau. l’eau. Il existe existe une technol technologi ogiee membran membranaire aire,, la nan nanofilt ofiltrati ration, on, qui constit constitue ue une
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2. Introduction ` a la chimie de l’eau 2.1. 2.1. Qu’e Qu’est st-c -ce e que l’eau l’eau ? Il est usuel de croire que l’eau est H2 O. En fait, une description description plus pr´ecise ecise de ce liquide serait : l’eau, c’est H 2O plus une s´erie erie d’impuret´es. es. Le praticien du traitement de l’eau doit connaˆıtre ıtre ces impuret´ impure t´es, es, leurs cons´equences equen ces sur les propri´ prop ri´et´ et´es es de l’eau, l’eau , et aussi les unit´es es de mesures mesur es employ´ees ees pou pourr exprimer expri mer ces impuret´ impure t´es es afin de comprendre compr endre les analyses d’eau. Cet ouvrage s’adressant a` des praticiens de l’industrie, nous ne traiterons pas ici des
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2.2. LES CLASSES CLASSES DE DE POLLUANTS POLLUANTS
Fig.
2.1.: La mol´ecule ecule d’eau
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` LA CHIMIE DE L’EAU CHAPITRE CHAPITRE 2. 2. INTRODUCT INTRODUCTION ION A
• • • •
Les ´el´ el´ements eme nts solubl sol ubles es : on o n pour p ourra ra les ´elimin eli miner er par osmose osm ose inverse inver se ou ´echange echa nge d’ions d’io ns1 Les micro-orga micro -organismes nismes : on pou pourra rra les d´etruire etru ire par des m´ethodes etho des de d´esinfectio esinf ection n Les compos´ comp os´es es insolubles insolu bles : il faudra faudr a pr´ p r´ecipiter ecipit er ou filtrer filtre r Les compo co mposants sants organiqu or ganiques es : ils constit co nstituent uent une nourriture nourr iture pou pourr d’´eventuelles eventuell es bact´ bac t´eries, eries , il faudra faudr a d donc onc les ´eliminer, elimin er, en g´en´ en´eral eral par oxydation oxydatio n ou o u par p ar absorption absor ption sur charbon charb on actif
2.3. Une classificati classification on alternativ alternative e
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2.3. UNE CLASSIFICATION CLASSIFICATION ALTERNA ALTERNATIVE TIVE
• • • • • • • • •
Arsenic Baryum Bromide Cuivre Plomb Lithium Man Ma ngan` ga n`ese es e Phosphate Zinc
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` LA CHIMIE DE L’EAU CHAPITRE CHAPITRE 2. 2. INTRODUCT INTRODUCTION ION A
2.4. Les unit´ es es de mesure L’eau est un produit complexe. il n’est donc pas ´etonnant etonnant que l’on utilise un nombre nombre important impo rtant d’unit´es es de mesure mesur e pou pourr le d´ecrire. ecrir e. Les Le s un unit´ it´es es de mesu me sure re g´en´ en´eral er alem ement ent util ut ilis´ is´ees ee s sont so nt :
Mesure de concentrations : ppm, mg/l, grains pH : exprim´ exp rim´e sans s ans dimens dim ension ion ex prim´ im´e en mV Potenti Pote ntiel el r´ edox ed ox : expr
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´ DE MESURE 2.4. 2.4. LES UNIT UNIT ES
enlever enlever de l’eau. Hormis Hormis ces deux cas il vaut mieux ne pas utiliser les ppm comme CaCO3 . Pour obtenir le facteur de conversion pour passer de la concentration comme ion a` la concentration comme CaCO3 , il faut diviser la masse molaire du carbonate de calcium par la ”masse ”mass e ´equivalente”, equivalente” , qui q ui est la masse molaire molair e divis´ee ee par la valence. Cette unit´e est pratique pour exprimer la duret´ d uret´e, e, c’est plus facile ensuite pour calculer la capacit´ c apacit´e de l’adoucisseur l’adoucisseur.. Les chimistes chimiste s utilisent ut ilisent aussi les unit´es es mMol/l m Mol/l et mV m Val/l, qui exprim e xpriment ent la quantit´e de mol´ecules ecule s - resp r espectivem ectivement ent la quantit´e de charges charge s ´electriques elect riques - contenues c ontenues dans l’eau. l’eau . Une Un e Mole d’une substance a la meme masse en grammes que sa masse mol´eculaire eculaire relative. relative.
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` LA CHIMIE DE L’EAU CHAPITRE CHAPITRE 2. 2. INTRODUCT INTRODUCTION ION A
mais c’est un param`etre etre moins fiable pour pr´edire edire le risque d’entartrage des membranes. En cas de litige avec avec le fournisseur fournisseur de membranes, membranes, cela peut ˆetre etre un probl` probl`eme. eme. Un laboratoire d’analyse devrait ˆetre etre capable de mesurer le SDI, mais ce n’est pas toujours le cas. Par contre, l’on trouve dans le commerce des kits pour la mesure du SDI. Le SDI doit do it im imp´ p´erat er ative iveme ment nt ˆetre et re mesu me sur´ r´e sur su r plac pl ace. e. Les valeurs valeu rs du SDI peuvent pe uvent ˆetres etr es interpr´ inte rpr´et´ et´ees ees comme com me suit sui t : • Inf´ In f´erie er ieur ur a` 3 : pas `a peu d’entartrage de la membrane • Entre 3 et 5 : conditions normales d’utilisation
Su Sup´ p´ ie
a` 5 : entartrage excessif `
´ oi
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2.5. 2.5. PH, ACID ACIDES ES ET BASES BASES
F
UK
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` LA CHIMIE DE L’EAU CHAPITRE CHAPITRE 2. 2. INTRODUCT INTRODUCTION ION A
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´ 2.9. 2.9. L’ EQUILIBRE CALCO-CARBONIQUE DE L’EAU
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` LA CHIMIE DE L’EAU CHAPITRE CHAPITRE 2. 2. INTRODUCT INTRODUCTION ION A
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´ 2.9. 2.9. L’ EQUILIBRE CALCO-CARBONIQUE DE L’EAU
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´ ES ´ MEMBRANAIRES CHAPIT CHAPITRE RE 5. 5. PROC PROC ED
affirmations affirma tions de fabrica fa bricants, nts, et aussi d’´evaluer evaluer le fonctionne fonct ionnement ment d’un d’u n osmoseur osmo seur : les ´ecarts ecart s de d´ebits ebits et de conductivit´ condu ctivit´e seront incompr´ incomp r´ehensibles ehens ibles si l’on ne connaˆıt ıt pas les lois qui les le s r´egis eg isse sent. nt.
Quelqu Que lques es d´ efiniti efin itions ons Il est e st usuel de repr´esenter esenter un osmoseur dans un sch´ ema ema sous la forme f orme d’un rectangle avec une diagonale qui repr´ re pr´esente esente la membrane, comme dans la figure figur e 5.6 5.6..
Fig.
5.6.: Repr´esentation esentation sch´ ematique ematique d’un osmoseur ou d’une membrane d’osmose inverse
Qe : d´ebit ebit d’eau entrant dans l’osmoseur l’osmo seur Q p : d´ebit eb it perm´ pe rm´eat, ea t, ou d´ebit eb it d’ea d’ eau u pass pa ssant ant a` travers la membrane Qc : d´ebit ebi t de concent con centrat rat ce : concentration de solides dissous dans l’eau entrant dans l’osmoseur c p : concentration de solides dissous dans le perm´eat eat de l’osmoseur l’osmoseu r cc : concentration de solides dissous dans le concentrat de l’osmoseur
D´ ebit ebit en fonction foncti on des pressions Qe = K T [(P 1m − P 2m ) − (P osm T × [(P osm1 − P osm osm2 )]
(5.1)
Avec : bi t a` travers la membrane • Qe : d´ebit • K T ee ee par le fabricant de la membrane. La valeur de cette cet te constante const ante T : constante donn´ • • • •
varie avec la temp´erature. erat ure. P 1m : pression moyenne en amont de la membrane P 2m :pression moyenne en aval de la membrane P osm osm1 :pression osmotique moyenne en amont de la membrane P 2 : pression osmotique moyenne en aval de la membrane
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5.2. OSMOSE INVERSE INVERSE
En pratique on admet les approximations suivantes : P 1m =
1 × (P e + P c ) 2
P 2m = P p
(5.2) (5.3)
P e ´etant etant la pression press ion a` l’entr´ee ee de la membrane, membran e, P c la pression du concentrat et P p la pressio pre ssion n du perm´ pe rm´eat. eat . De D e la mˆeme eme fa¸con, con, on admet que : P osm osm1 =
1 × (P osme osme + P osmc osmc ) 2
P osm osm2 = P osmp osmp
(5.4) (5.5)
P osme etant etant la pression osmotique de l’eau d’alimentation de l’osmoseur, P osmc osme ´ osmc la pression osmotique du concentrat et P osmp eat. eat. osmp la pression osmotique du perm´ En pratique, P osmp osmp P osme osme , donc P osm osm2 P osm osm1 , donc (P osm osm1 − P osm osm2 ) ≈ P osm osm1 L’on calcule calcu le donc en g´en´ en´eral eral en utilisant utilisa nt P osm (P osm osm1 en lieu et place de (P osm1 − P osm osm2 ). Il faut par contre prendre garde a` ne pas confondre P osm erence eren ce peut peu t osm1 avec P osme osme : la diff´ ˆetre etre importante et conduire a` des erreurs importantes.
Estimation de la pression osmotique La pression osmotique est une fonction des solides dissous dans l’eau. En pratique l’on peut utiliser l’approximation suivante : P osm osm = T DS × 0.0008
(5.6)
TDS ´etant etant le total tota l des solides solide s dissous disso us dans l’eau. Les unit´es es utilis´ees ees ´etant etant : • [P osm osm ] = bar • [T DS ] = ppm
Rejet et recouvrement Pour l’utilisateur, l’utilisateur, un ”bon” osmoseur osmoseur est un osmoseur osmoseur qui r´eduira eduira le plus possibl p ossiblee la min´eralisation eralisation de l’eau et consommera le moins d’eau possible. Ces deux param`etres etres sont mesur´es es par le taux de recouvrement recouvrement et le taux de rejet :
D´efini efi niti tion onss : Taux de recouvrement : R =
Qp Qe
Taux de rejet (rejet) : Rej = 1 − avec C =
1
× (C + C )
C p C ec ec
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´ ES ´ MEMBRANAIRES CHAPIT CHAPITRE RE 5. 5. PROC PROC ED
Effet Effe t de la temp´erature era ture Corr( Corr(T ) T ) = 1.03(T
−
25)
(5.7)
o`u T est la temp´erature eratu re de l’eau en degr´es es Celcius. Celciu s. Le d´ebit ebit d’une membrane membran e ayant un d´ebit ebi t nomina nom inall QN a` 25 C sera a` une temp´erature erature T quelconque : ◦
Q(T ) T ) = Corr( Corr(T ) T ) × QN
(5.8)
Bilans Il est important de rappeler que les bilans de masse de l’eau et des solides dissous s’appliquent : Qe = Qc + Q p
(5.9)
Qe × C e = [Qc × C c ] + [Q [ Q p × C p ]
(5.10)
L’ensemble L’ensemble des ´equations equations permettent permettent de faire les calculs courant concernant concernant la performance formance de votre votre osmoseu osmoseur, r, comme comme par exemple exemple la qualit qualit´´e de l’eau l’eau a` la sortie, en connaissant connaissant le taux de rejet et la qualit´ qualit´e de l’eau en entr´ entr´ee, ee, ou bien les variations ariations de performances a` attendre atten dre d’une variation de la qualit´e de l’eau, du taux de recouvrement, etc. D’autre D’aut re part, il est essentiel essenti el de connaˆıtre ıtre ces ´equations equat ions pou pourr ´evaluer evaluer l’efficacit´ l’effica cit´e de la maintenance d’un osmoseur.
Taux de rejet de diff´ erents erents sels Le taux de rejet d’une membrane membrane ou d’un osmoseur est toujours donn´ e par les fabricants pour du NaCl. Bien sˆ ur l’eau comporte aussi d’autres sels dissous, et les taux de ur rejet peuvent varier fortement d’un sel a` l’autre. [4] donne a` la page 88 une liste compl`ete ete des taux de rejet des diff´ diff´erents erents sels. Nous citons ici quelques quelques exemples exemples dans le tableau 5.2.2 a` la page 50 50.. Sel Sel CaSO4 MgCL2 Ca(NO3 )2 Mg(NO3 )2 Tab.
Tau aux x de passage age (rel relativ tivement au NaCl) 30% 60% 500% 500%
5.1.: Taux de rejets de diff´erents erents sels, relativement au NaCl
Les fabricants de membranes fournissent des programmes de calculs qui, utilisant ces taux de passage diff´erents erents pour chaque chaque sel, calculent la concentration concentration ion par ion dans le perm´ p erm´eat eat pour une eau e au d’alimentation donn´ee. ee. Au moins un fabricant [20 20]] permet a` tout un chacun de t´el´ el´echarger echarg er ce programme progr amme depuis depui s son s on site Web.
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5.2. OSMOSE INVERSE INVERSE
Ordres de grandeur Taux de rejet, pour NaCl : Polyamide : 98 a` 99.7 % Ac´ etate etate de cellulose cellulose : 93 a` 98 %
Taux de recouvrement : Pour une memb Pour membran ranee : 13 a` 20 % Pour une unit´e : 33 a` 75 % Dans une machine d’osmose inverse, l’on combine plusieurs membranes, et l’on peut aussi recycler une partie du concentrat, pour obtenir des taux de recouvrement recouvrement beaucoup plus pl us ´elev´ el ev´es es que qu e les le s 13 a` 20% . Bien sˆur ur cela a pour corollaire que le taux de rejet d’une machine d’osmose inverse sera toujours plus bas que le taux de rejet d’une membrane seule. En pratique, les taux de rejet pour le NaCl d’un osmoseur seront de l’ordre de 95 a` 99%.
D´ ebits ebi ts par membrane membr ane (` a enviro env iron n 16 bar) : Mat´ at´ eria e riau u
Diam Diam` ` etre e tre
D´ ebit e bit
Polyamide Polyamide Ac´etate de cellulose Ac´etate de cellulose
4” 8” 4” 4” 8” 8”
0.25 m3 /h 1 m3/h 0.15 m/3 h 0.60 m/3 h
Les dimensions des membranes pour les osmoseurs industriels sont plus ou moins standardis´es es : pratiquement tous les fabricants proposent des modules de diam`etre etre de 4” et de 8”, et d’une d’une longueu longueurr de 40” (envir (environ on un m` etre). etre). Pa Parr contre, contre, pour les peti p etits ts osmoseurs commerciaux ou de laboratoire, laboratoire , il existe un tr`es es grand nombre de diam`etres etres de membranes (1.8”, 2”, 2.5”, etc.) et un choix presque infini de longueurs de modules. Pour les membranes en e n ac´etate etate de cellulose, le d´ebit ebit varie avec le taux de passage : les membranes membran es avec un taux de rejet ´elev´ elev´e ont un d´ebit ebit plus faible. faible .
Les mat´ eriaux eriaux de membranes d’osmose inverse : Mat´ eriaux
Polyamide
Rejet NaCl pH Rejet Reje t compos´ comp os´es es organiques orga niques Chlore C l2 libre Temp´ Temp ´erat er atur uree
98 a` 99.7 % 93 a` 98 % 3 a` 10 4 a` 8 > 150 mass massee mol. mol. > 200 a` 250 250 mass massee mol. mol. < 0.1 ppm > 0.2 pp ppm m et < 2.0 ppm < 40 C < 40 C ◦
Ac´ etate de cellulose
◦
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´ ES ´ MEMBRANAIRES CHAPIT CHAPITRE RE 5. 5. PROC PROC ED
Il existe des modules pour p our hautes temp´eratures eratures avec des membranes membranes en polyamide polyamide : pourr la membrane pou membran e elle-mˆ e lle-mˆeme, eme, une temp´erature erat ure de l’eau jusqu’` jusqu ’` a 90 C ne pose po se pas p as r´eellem eel lement ent un probl` pro bl`eme, eme , mais ma is par p ar contre cont re le prob p robl` l`eme eme est au niveau nive au de la colle c olle et des autres aut res ´el´ el´ements eme nts en plastique (tubes, grilles, joints) employ´ es es pour p our la construction des modules. mo dules. ◦
5.2.3. Exemples d’unit´es es d’osmose d’ osmose inverse
Fig.
5.7.: Sch´ema ema d’un petit pet it osmoseu o smoseurr industriel. indust riel. Sch´ema ema : Osmonics Os monics
Le sch´ema ema de la figure figur e 5.7 est typique d’un petit osmoseur industriel. On remarque en particulier :
Le pr´ efilt efi ltre re : il prot` pr ot`ege ege les membranes me mbranes des particules en suspension La pompe Les membranes : le concentrat sortant de 2 membranes alimente la 3e membrane. Le concentrat conce ntrat de cette cett e derni`ere ere est en partie parti e recycl´ recyc l´e Vannes de r´ eglage eglage concentrat et recyclage : en ajustant ces deux vannes, l’on peut ajuster le taux de recouvrement de la machine
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5.2. OSMOSE INVERSE INVERSE
Fig.
5.8.: Exemple d’unit´e d’osmose inverse pour laboratoire. laboratoire . Photo : Electrolux Elect rolux
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´ ES ´ MEMBRANAIRES CHAPIT CHAPITRE RE 5. 5. PROC PROC ED
Fig.
5.10.: Osmoseur industriel de taille moyenne, muni de membranes 4”. Photo : Osmonics
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5.3. ULTRAFIL ULTRAFILTRA TRATION TION
5.3. Ultrafiltra Ultrafiltration tion Comme l’osmose inverse, l’ultrafiltration est une technique de filtration tangentielle. Contraireme Contra irement nt aux membranes d’osmose d’os mose inverse, les membranes membra nes d’ultrafiltr d’ultr afiltration ation n’enl` n’e nl`event event aucun ion de l’eau. Les membranes d’ultrafiltration ont des pores : c’est incontestable, ils sont observables au microscope. il s’agit d’une technologie assez mˆ ure. ure. Il y a un grand choix de mat´eriaux eriau x de membrane membran e : polysulph poly sulphone, one, polypropyl` pol ypropyl`ene, ene, polyamide, pol yamide, ac´etate etat e de cellulose, cellulose, etc. L’utilisation principale de l’ultrafiltration est la filtration au point d’utilisation dans les syst`emes emes de prod p roductio uction n d’eau ultrap u ltrapure, ure, surtout sur tout en e n pharmaceut pharm aceutique ique et en e n micro´electroniqu elect ronique. e. depuis depu is quelques que lques ann´ees, ees, l’on voit aussi des machines m achines d’ultrafiltr d’ultr afiltration ation destin´ desti n´ees ees a` la potabilisation bilisa tion de d e l’eau. l’ea u. Les taux de d e recouvre rec ouvrement ment sont beaucoup bea ucoup plus ´elev´ elev´es es en ultrafiltra ultra filtration tion que en osmose inverse : l’on parle de 80 a` 90% avec de l’eau de ville ou en potabilisation de l’eau, et plus de 95% en filtration de finition d’eau ultrapure.
Fig.
5.12.: Exemple d’unit´e d’ultrafiltration au point d’utilisation [20 20]]
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´ ES ´ MEMBRANAIRES CHAPIT CHAPITRE RE 5. 5. PROC PROC ED
Fig.
5.13.: Sch´ema ema d’une unit´e d’ultr d ’ultrafiltr afiltration ation au point poi nt d’utilisat d’u tilisation ion [20 20]]
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5.4. NANOFILTRA NANOFILTRATION TION
5.4. Nanofiltra Nanofiltration tion La nanofiltrat nanofi ltration ion enl`eve eve 30 a` 50 % des ions monovalents et plus de 90% des ions divalents. valents. Cette caract´eristique eristique fait de la nanofiltration une alternative int´ eressante eressante a` la d´emin´ em in´eral er alisa isati tion on part pa rtie iell llee et e t a` l’adoucissement par ´echange echange d’ions. Il s’agit d’une technologie relativement jeune. je une. Les ´ecarts ecarts de performances performance s entre membranes non n´egligeables. egligeables. Les membranes sont faites dans les mˆemes emes mat´eriaux eriaux que les membranes d’osmose inverse (polyamide et ac´etate etate de cellulose), et sont utilis´ees ees a` des pressions un peu plus basses que les membranes d’osmose inverse : des pressions de 8 `a 10 bar sont typiques. En tout cas au d´ebut, ebut, certains fabricants fabricants proposaient comme membranes membranes de nanofiltration les ´ecarts ecarts de d e production pro duction de membranes d’osmose inverse. Depuis, la nanofiltration s’est impos´ee ee comme m´ethode ethode de traitement de l’eau dans l’industrie, surtout comme alternative aux adoucisseurs pour des applications en agro-alimentaire, et des fabricants ont don doncc d´evelopp´ evel opp´e des membran memb ranes es sp´ecifiqu eci fiques es a` la nanofiltration. Jusqu’`a pr´esent, esent, les facteurs facte urs suivants ont limit´e le d´eveloppement evelopp ement de la nanofiltrat nanofi ltration ion comme remplacement des adoucisseurs : • Le coˆ ut ut de d e l’eau l’ eau rejet´ reje t´ee ee (concentrat (conc entrat))2 • Les coˆ uts uts d’investissement, d’investiss ement, beaucou bea ucoup p plus ´elev´ elev´es es a` l’heure actuelle que pour un
adoucisseur a` ´echange echa nge d’ions d’i ons La nanofiltration nan ofiltration n’est donc utilis´ee ee que dans les situations o` ou` le fait que elle enl`eve eve aussi a ussi des bact´eries eries et des substances substances organiques et qu’il n’y a pas de saumure saumure a` ´elimin eli miner er est un avantage.
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6. La main mainte tena nanc nce e des des osmo osmose seur urss Notre exp´erience erience est que la maintenance des osmoseurs est trop souvent n´eglig´ eglig´ee. ee. Il en r´esulte esu lte une produc pro ductio tion n d’ea d ’eau u de d e qual q ualit´ it´e inf´ i nf´erieur eri euree a` celle que l’on pourrait obtenir, et une dur´ee ee de vie r´eduite eduite des membranes. C’est C ’est pourquoi nous consacrons ici un chapitre s´epar´e a` ce sujet. Bien que ce chapitre chapitr e se s e r´ef` ef`ere ere sp´ecifiquement ecifiqu ement aux osmoseurs, osmos eurs, tout ce qui y est e st dit est applicable aussi aux machines a` nanofiltration, et dans une certaine mesure aux machines a` ultrafiltration. ultrafiltration.
6.1. 6.1. Suivi Suivi des des performa performance ncess La maintenance maintenance d’un osmoseur est plus simple que celle d’un ´echangeur echangeur d’ion par exemple. L’essentiel du travail de maintenance, a` l’e l ’exc xcep epti tion on d’op´ d’o p´erat er atio ions ns asse as sezz sp´ s p´ecia ec ialis´ lis´ees ee s mais peu fr´equentes equentes comme le changement des membranes par exemple, peut ˆetre etre fait par le personnel de maintenance sans faire appel a` des d es fournisseur fourn isseurss ext´ e xt´erieurs. erieu rs.
6.1. 6.1.1. 1. Param` etres etres ` a enreg enr egis istre trerr
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6.1. SUIVI DES DES PERFORMAN PERFORMANCES CES
Ces param` param`etres etres ne sont pas en eux-mˆ eux-mˆemes emes une mesure directe des performance de l’osmoseur. l’osmoseur. Comme nous l’avons l’avons vu au paragraphe paragraphe 5.2.2 5.2.2,, le d´ebit ebit varie en fonction fonct ion de la temp´erature erat ure par exemple exemp le et la qualit´e de l’eau produite pro duite varie en fonction fonct ion de la la l a qualit´ q ualit´e de l’eau d’alimentation : or ces param`etres etres varient au cours du temps dans pratiquement toutes les installations installations.. Il est donc essentiel essentiel de proc´eder eder a` quelques calculs a` partir des valeurs valeu rs enregi enr egistr´ str´ees. ees .
6.1.2. Param` Param` etres etres ` a calculer sur la base des enregistrements enregist rements Taux de recouvrement en % : En principe ce taux ne devrait pas varier. Il peut varier au cours co urs de d e l’ann´ l’an n´ee ee si la temp´ te mp´erature eratu re de l’eau d’alimentatio d’alim entation n varie. Il faudrait fau drait alors utiliser les vannes permettant d’ajuster d’ajust er les d´ebits ebits de concentrat et de recyclage rec yclage D´ebit bi t de perm´ rm´ eat ea t ` a T= 25 C et P moy parlee souv souven entt de normalisamoy = P nominale nominale : on parl tion tio n du d´ebit ebit . Comme Comme nous l’avo l’avons ns vu plus plus haut, haut, le d´ebit ebit varie en fonction fonction de la temp´erature erature de l’eau et de la diff´erence erence de pression a` travers la membrane. On ne peut peu t donc comparer compa rer directement direc tement les d´ebits ebits mesur´es. es. Si le d´ebit ebit de perm´ pe rm´eat eat est rest´e constant const ant alors que la temp´erature eratu re de l’eau a augment´ augme nt´e de 8 C par exemple, alors les perform pe rformances ances se son d´egrad´ egra d´es es d’avantage que si a` temp´ te mp´erat er atur uree ´egal eg alee et a` une diff´erence eren ce de pression pres sion a` travers trave rs la membran memb ranee qui aurait aur ait l´eg` eg`erement ere ment augment´ aug ment´e le d´ebit ebit de perm´ per m´eat eat ´etait etait rest´e constant. const ant. Il faut donc calculer, calcu ler, avec les ´equations equat ions du paragraphe 5.2.2 5.2.2,, de combien serait serai t le d´ebit ebit de perm´ pe rm´eat eat si la temp´erature eratu re ◦
◦
Conduc Con ductiv tivit´ it´ e moyenne moyenn e : C moy moy = Taux de rejet : Rej = 1 −
Calim+C c
2
C p C moy moy
erence entre la pression Perte de charge, cˆ ot´ ot´e conc co ncen entr trat at,, ` a d´ebit eb it cons co nsta tant nt : la diff´erence en aval de la pompe haute pression et la sortie du concentrat des membranes
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CHAPITRE CHAPITRE 6. LA MAINTENAN MAINTENANCE CE DES OSMOSEURS OSMOSEURS
donc conseill´ conse ill´e de tracer trac er des graphiques grap hiques donnant donna nt le d´ebit ebit de perm´ per m´eat eat a` 25 C (et P moy moy = P nominale ∆P norm nominale ) , le taux de rejet des membranes et ∆P norm . ◦
6.2. Nettoy Nettoyage des membrane membraness Il est in´evitable evita ble que qu e apr`es es un certain cert ain temps te mps les le s perfor p erformance mance d’un osmoseu o smoseurr diminuent. dim inuent. Il faut alors nettoyer nett oyer les membranes. de d e combien faut-il que les performances p erformances se d´egradent egradent pour qu’un nettoyage soit justifi´e ? L’ensemble de la litt´erature erature et plusieurs fabricants1 conseillent de nettoyer lorsque lor sque les performances se sont d´egrad´ egrad´ees ees comme suit : 1. Le d´ebit ebi t de perm´ pe rm´eat eat a` 25 C et P moy bai ss´e de 10 a` 15% moy = P nominale nominale a baiss´ ◦
2. ∆P norm augme nt´e de 10 a` 15% norm a augment´ 3. Le taux de rejet a baiss´e de 1 a` 2 % Les produits a` employer employer pour p our le nettoyage nettoyage sont fonction fonction de la nature du d´epˆ epˆ ot que l’on trouve sur la membrane. [4 [4] affirme qu’il faut proc´eder eder a` une analyse de la nature du tartre que l’on trouve sur la surface de la membrane avant de choisir le produit nettoyant. Cette m´ethode ethode implique que l’on extrait une membrane de la machine avant avant de proc´ pro c´eder eder au premier premi er nettoyage et qu’on la d´etruit etrui t pou pourr effectuer effect uer un pr´el` el`evement evement : elle n’est n ’est donc ´economiquem econo miquement ent d´efendable efen dable que si s i l’on utilise un osmoseur osm oseur avec un grand gr and 2 nombre de membranes , ce qui est rarement rar ement le cas des de s osmoseurs utilis´es es dans dan s l’industrie. En pratiq pra tique, ue, il est don doncc g´en´ en´eralem era lement ent pr´ef´ ef´erable era ble de proc´ pro c´eder ede r par essais ess ais succes suc cessif sifs. s. On trouve tro uve diff´erents ere nts type typ e de d´epˆ epˆ ots sur les membranes des osmoseurs : ots
D´ epots o ˆts inorganique : ils r´esultent esult ent de d e la concentratio conce ntration n des d es diff´erents erents sels dissous dissou s dans d ans l’eau et du changement de l’´equilib equi libre re calco-carboniqu calco-carbon iquee de l’eau. La meilleure fa¸con c on de
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6.2. NETTOY NETTOYAGE AGE DES MEMBRANES MEMBRANES
Diam`etre etr e 4” 8” Tab.
D´ebit ebi t max. 40 l/min 120 l/min
Vol. solut so lution ion par pa r ´el´ el´ement eme nt 20 litres 80 litres
6.1.: D´ebits ebits et volumes de solution soluti on de nettoyage nett oyage recommand´ reco mmand´es es
Sp´ ecification ecificati on des produits produit s de nettoyage Les fabricants fabr icants de membranes donnent des sp´ecifications ecifications des produits pro duits a` employer pour les diff´erents erents types de nettoyages (acide, croissance biologique, etc.). Ces sp´ecifications ecifications font fo nt g´en´ en´eral er alem ement ent app ap p els el s a` des produits que l’on trouve facilement en droguerie dr oguerie ou aupr`es es d’un distributeur de produits chimiques, comme l’acide nitrique, l’EDTA, etc. Il arrive que des fournisseurs d’installations d’osmose inverse proposent des produits nettoyant prˆets, g´en´eralem le ment a` des de s prix pr ix prohi pr ohibit bitifs ifs.. Notre Not re exp´ e xp´erienc eri encee est es t que qu e en g´en´ en´eral era l il n’es n ’estt pas pa s ´economique economique de les utiliser. utiliser. Il existe aussi des cartouches cartouches que l’on place a` la place de la cartouche cartouche filtrante filtrante de l’osmoseur, l’osmoseur, et qui relarguent une solution solution nettoyante nettoyante lorsque l’eau les traverse. traverse. Cette solution solution est tr`es es pratique pratique et ´economique economique pour les petits osmoseurs osmoseurs 3 (jusqu’`a environ 3 m /h).
Quel Quel produit produit utiliser utiliser ? En pratique, dans environ 80% des cas, la baisse des performances est due essentiellement a` des de s d´epˆ epots oˆts inorganiques. Il est donc pr´ef´ ef´erable erable de commencer par un nettoyage acide. acide . Si S i les l es r´esultats esult ats sont insuffisants, insuffis ants, proc´ pro c´eder eder alors a` un nettoyage avec une solution e basique, puis `a un 2 nettoyage acide, car si il y a un biofilm, il et probable que sous celui-ci celui -ci se trouve un d´epˆ epˆot ot de substances inorganiques.
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7. La d´ esinfection esinfection de l’eau Il existe actuellement 5 m´ethodes ethodes courantes pour la d´esinfection esinfection de l’eau dans l’industrie : 1. La chlorati chloration on de l’eau l’eau 2. La st´erilisation erilisation par les rayons r ayons U.V. 3. L’ozonisation L’ozonisation 4. La microfiltrati microfiltration on 5. L’ultrafiltratio L’ultrafiltration n La distillation distillation n’est plus utilis´ utilis´ee ee que dans des cas exceptionnels, exceptionnels, comme l’industrie l’industrie pharmaceu phar maceutique tique.. Elle sera tout de mˆeme eme trait´ee ee s´epar´ epar´ement, ement, dans le chapitre chapitr e 14 a` la page 112 112.. La chloration et la st´erilisation erilisation par UVc sont des m´ethodes ethodes tr`es es simples a` mettre en œuvre, alors que l’ozonisation est e st plus complexe, mais aussi plus int´ eressante. eressante. La microfiltration est int´ eressante eressante uniquement dans des cas tr`es es particuliers en raison des ses coˆ uts uts ´elev´ ele v´es es de foncti fon ctionn onneme ement. nt. L’ultrafiltration L’ultrafiltration est utilis´ee ee depuis depui s longte lo ngtemps mps en micro´electronique electronique pour la st´erilisation erilisation finale au point d’utilisation et est utilis´ee ee aussi en eau potab p otable. le. La destruction de struction des biofilms biofi lms est trait´ee ee dans da ns le chapitre 12 a` la page 102
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8. St´ eril erilis isat ation ion U.V. U.V. 8.1. Principe et limites de la d´ esinfection esinfection par ultraviolets 8.1.1. Principe Principe de fonctionnement fonctionnement Le principe princ ipe de la l a st´erilisation erilis ation de l’eau l ’eau par ultraviolet ultravio let est tr`es es simple s imple : on ´eclaire eclai re l’eau avec des rayons UVc, qui ont un effet germicide ge rmicide par destruction des mol´ecules ecules d’ADN.
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´ CHAPIT CHAPITRE RE 8. ST ERILISATION U.V.
d’application d’applications, s, cela ne pose pas de probl` probl`emes, emes, mais dans certains cas, comme en micro-´electronique, electronique, par exemple, il faut combiner la st´erilisation erilisation par ultraviolet avec la microfiltration ou l’ultrafiltration pour ´eliminer eliminer les particules que sont devenues les bact´eries eries inactiv´ inact iv´ees ees par le st´erilisateur erilisa teur U.V. de l’eau utilis´ee ee pou pourr laver les Wafers par exemple. bac t´eries eri es sont d´ej` ej`a pr´esentent esente nt en aval du st´erilisateur erilis ateur Pas d’effet d’e ffet r´ emanent eman ent : si des bact´ UV, elles resterons actives. La st´erilisation erilisation U.V. n’a donc absolument aucun effet sur les biofilms
8.1.3. Longueur Longueur d’onde d’onde Longueur d’onde utilis´ee ee pour st´eriliser eriliser l’eau est de : 254 nm. A 185 nm l’ultraviolet produit de l’ozone, l’ozone, dans l’eau et dans l’air : m´ethode ethode pour produire l’ozone, de moins en moins moi ns utilis´ uti lis´ee, ee, sauf sau f pour p our des tr`es es petit pe titss g´en´ en´erateu era teurs rs d’ozon d’o zone. e. Par contre, cont re, a` 254 nm, le rayonnement rayonneme nt ultraviole ult raviolett d´etruit etrui t l’ozone l’ ozone : il s’agit de la seule s eule m´ethode etho de fiable pou pourr d´etruire etru ire l’ozone. l’ozo ne. Elle est d´ecrite ecrit e en d´etail etail a` la page 87 87..
8.1.4. Les lampe lampe ultraviolet ultraviolet
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´ 8.2. DIMENSIONN DIMENSIONNEMEN EMENT T D’UN ST ERILISATEUR UV
Fig.
8.3.: R´eduction educ tion du rayonnement rayonneme nt ´emis emis au bou boutt de d e 7 jours, j ours, en fonction fonct ion de la duret´e [24 24]. ]. Ce graphique graphique confirme que l’entartrage l’entartrage du quartz est un d´esavantag esavantagee
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´ CHAPIT CHAPITRE RE 8. ST ERILISATION U.V.
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´ 8.3. DOSES DE RAYONNE RAYONNEMENT MENT UV POUR POUR DIFF ERENTES CLASSES DE MICRO-ORGANISMES
Tab.
Micro-organisme D10 en mJ/ mJ/cm2 Escherichia Coli 3.0 Pseudomonas Auroginosas 5.0 Staphylloco ccus Aureus 2.18 Moisissures 30 a` 300 Algues 300 a` 600 8.1.: Doses d’inactivation D10 pour quelques micro-organismes communs
La dose de rayonnement UVc n´ecessaire ecessaire est fonction fo nction du micro-organisme a` ´elimi el imine ner. r. L’on trouve trouve dans la litt´ litt´erature erature des tableaux donnant les Doses D10 pour divers microorganismes. Cette dose est d´efinie efinie comme suit :
Dose D10 : dose de rayonnement UVc qui permet d’inactiver 90.0% des micro-organismes pr´ pr ´ese es ents nt s Une fois D10 connue, connue, l’on peut calculer calculer facilement facilement la dose n´ecessaire ecessaire pour inactiver inactiver des pou pourcenta rcentages ges plus ´elev´ elev´es es de micro-orga micro -organismes nismes :
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´ CHAPIT CHAPITRE RE 8. ST ERILISATION U.V.
Micro-organisme Bacillus anthracis B. enteritidis B. Megatherium sp. (vegatative) B. Megatherium sp. (spores) B. paratyphosus B. subtilis (vegatative) B. subtilis (sp ores) Clostridium tetani
Dose D1000 en mJ/ mJ/cm2 8,700 7,600 2,500 52,000 6,100 11,000 58,000 22 0 00
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´ 8.3. DOSES DE RAYONNE RAYONNEMENT MENT UV POUR POUR DIFF ERENTES CLASSES DE MICRO-ORGANISMES
Micro-organisme Asp ergillus flavus Asp ergillus glaucus Asp ergillus niger Mucor racemosus A Mucor racemosus B Oospora lactis Penicillium digitatum Penicillium expansum
Dose D1000 en mJ/ mJ/cm2 99,000 88,000 330,000 35,200 35,200 11,000 88,000 2 2 000
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´ CHAPIT CHAPITRE RE 8. ST ERILISATION U.V.
Tab.
Micro-organisme Dose D1000 en mJ/ mJ/cm2 Virus : Baker’s yeast 8,800 Brewer’s yeast 6,600 Common yeast cake 13,200 Saccharomyces cerevisiae 13,200 Saccharomyces ellipsoideus 13,200 Saccharomyces sp. 17,600 8.6.: Doses de rayonnement UV pour l’inactivation de levures
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´ 8.3. DOSES DE RAYONNE RAYONNEMENT MENT UV POUR POUR DIFF ERENTES CLASSES DE MICRO-ORGANISMES
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´ CHAPIT CHAPITRE RE 8. ST ERILISATION U.V.
Il est donc important lors des comparaison d’offres de plusieurs fournisseurs de savoir comment com ment chaque chaq ue st´erilis eri lisate ateur ur propo pro pos´ s´e est calcul´ cal cul´e. e. Les st´erilisa eri lisateu teurs rs calcul´ cal cul´es es par biodobio dosim´etrie etrie seront sero nt toujours tou jours plus chers a` p perfor erformance mancess ´egales, egale s, puisque puis que le coˆ ut ut de cette mesure tr`es couteuse uˆteuse doit ˆetre etre amorti par la vente des appareils.
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10.1. 10.1. PRINCIPE PRINCIPE
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CHAPITRE CHAPITRE 10. 10. OZONISA OZONISATION
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13. 13. L’ea L’eau u ozon´ ozon´ ee ee 13.1. Pourquoi l’eau l ’eau ozon´ ee ee ? L’eau ozon´ee ee est un d´esinfectant esinfectant trop peu connu, mais qui gagne en popularit´e dans l’industrie depuis quelques ann´ees. ees. Les motifs de ces gains en popularit´e sont essentiele ssentiellement :
La p ossi os sibi bililit´ t´ e tech te chni nique que donn´ do nn´ee ee par les le s g´ en´ en´erat er ateu eurs rs ` a haute hau te conc co ncen entra trati tion on La recherche de substituts du chlore , le chlore restant un produit dangereux a` stocker et a` manipuler
Avantages : Les avantage avantagess de l’ozone l’ozon e comme substitut subst itut du chlore ont ´et´ et´es es discut´ discu t´es es au chapitre chapitr e 10 10.. • D´esinfe esi nfecta ctant nt puissa pui ssant nt • Ne laisse pas de r´ esidus esidu s • Pas de stockage
Lorsque l’on parle d’eau d’eau ozon´ oz on´ee, ee, l’on parle de concentrations d’ozone beaucoup plus ´elev´ elev´ees ees que lors d’applicat d’app lications ions de d´esinfection esinfe ction de l’eau : alors que pour po ur la d´esinfection esinfe ction 3 de l’eau on emploie des dosages pouvant atteindre dosage 2 a` 3 g/m , on parle d’eau ozon´ee ee pour p our des concentrations d’ozone d’oz one de l’ordre de 10 a` 15 g/ g/m3 , voire 20 g/ g/m3 . L’eau ozon´ee ee est un d´esinfectant esinf ectant puissant, puiss ant, produit pro duit sur place a` coˆ ut ut r´edui ed uit, t, et, et , ´etan et antt donn do nn´´e que qu e l’ozone l’ozo ne est instable, instab le, elle ne pose pos e pas p as de probl`emes emes pou pourr son s on ´elimination elimina tion apr`es es utilisat u tilisation. ion. Elle est donc la solution pour toutes les situations o` u l’on veut d´esinfecte esi nfecterr sans s ans laisse lai sser r de traces. traces.
13.2. Applicatio Applications ns Ozonisation de l’eau Flux partiel : on utilise une partie de l’eau pour produire un d´esinfectant esinf ectant qu’on m´elange elang e avec le reste de l’eau Lavage Lav age de pi`eces ec es m´ etall eta lliq ique uess m icro´electroniq elect ronique ue : important impo rtant car une bact´erie erie est une particule parti cule Lavage de Wafers : en micro´
Lavage de r´
irs, condui
contrˆ ole des biofilms (voir page 102 ole 102))
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´ ´ LORS DE L’EMPLOI D’EAU OZON EE ´ 13.3 13.3.. S ECURIT E
Lavage de bouteilles, fˆ uts, murs et sols de caves : ces applications gagnent de l’imuts, portance dans l’industrie l’industr ie du vin, qui a pouratnt p ouratnt une r´eputation eputation de conservatisme. con servatisme. Ceux qui visitent les caveaux `a Napa, en Californie, Califo rnie, sont g´en´ en´eralement erale ment surpris surpr is ne ne pas voir de champignons sur les murs des caves, caves o`u l’on ne sent pas du tout l’odeur caract´etistiques etistiques de ces pi`eces eces humides en sous-sol : le motif mot if en est que a` Napa l’utilisatio l’utili sation n de l’eau ozon´ee ee pou pourr le nettoyage nett oyage des caves s’est g´en´ en´eralis´ eralis´e d´eja` a` la fin des ann´ eess eess 1990. Les r´esultats esultats sont des caves caves plus propres, et des ´economies economies importantes, en particulier au niveau des fˆ uts : avant l’introduction de uts l’eau ozon´ee, ee, l’on jetait 14 a` 13 des fˆ uts uts chaque ann´eee eee : on peut d´esormais esormais en sauver le 100% grˆ ace ace au lavage avec l’eau ozon´ee ee Lavage de l´ egumes, egumes , fruits, fruits , poissons pois sons Production Prod uction de glace ozon´ee ee employ´ee ee pour p our la conser c onservation vation d’alime d ’aliments nts
Fig.
13.1.: Syst`eme eme portable por table de product pro duction ion d’eau ozon´ee ee [23 23]]
13.3 13.3.. S´ ecur ecurit´ it´e lors lor s de l’em l’empl ploi oi d’ea d’eau u ozon´ ozon´ee ee 13.3 13.3.1 .1.. Probl` Pro bl`emes eme s sp´ecifiq ecifique uess ` a l’ut l’utililisa isati tion on d’eau d’eau ozon´ ozo n´ ee ee Par rapport a` une installation classique d’ozonisation de l’eau, une installation de producti pro duction on d’eau ozone pose pos e des d es probl` prob l`emes emes sp´ecifiques ecifiqu es : evitablement evitablement des personnes a` proxi pr oximit mit´´e de l’eau l’e au ozon´ oz on´ee ee • Il y a in´ • On utilise utilis e des concentrat conc entrations ions d’ozone d’ozo ne ´elev´ elev´ees ees Les effets e ffets de l’ozone sur l’organisme l’org anisme humain sont d´
dans la
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´ CHAPITRE CHAPITRE 13. 13. L’EAU L’EAU OZON EE
Fig.
13.2.: Syst`eme eme pour refroidissement a` l’eau (Hydrocooling (Hydrocooling )) de viande de poulet, avec eau ozon´ee. ee. Image : GDT Corporation C orporation [23 23]]
13.3.2 13.3.2.. Effets Effets de l’ozon l’ozone e L’ozo L’ozone ne est est moin moinss dan danger gereux eux que que le chlo chlore, re, puisque puisque on ne le stock stockee pas. pas. Il reste reste n´eanmoins eanmoins un gaz irritant et e t toxique, donc il faut fa ut ˆetre etre conscient des risques d’une exposition `a l’ozone. Ceux-ci sont d´ecrits ecrits dans le tableau 13.3.2 13.3.2..
13.3.3. 13.3.3 . Les mesures de pr´ ecaution ecaution Pour utiliser l’eau ozon´ee ee sans danger, il faut prendre des pr´ecautions ecautions : asp ect semble semb le ´evident, evid ent, mais mai s est souvent sou vent n´eglig´ egl ig´e. e. Mat´ Ma t´eria er iaux ux r´esis es ista tant ntss ` a l’oz l’ ozon one e : cet aspect 1 Il est critique surtout pour la phase gazeuse etecteurs sont aujourd’hui D´ etecte ete cteur ur d’ozone d’o zone contrˆ con trˆ olant olant l’air en continu : de tels d´etecteurs 2 b on marc ma rch´ h´e 1 2
Voir page 77 pour une liste de mat´eriaux eriaux r´esistants esistants `a l’ozone
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´ ´ LORS DE L’EMPLOI D’EAU OZON EE ´ 13.3 13.3.. S ECURIT E Concentration
Effet
0.01 a` 0.04 ppm en-dessous de 0.05 ppm 0.1 ppm plus de 0.1 ppm, exposition e xposition prolong´ p rolong´ee ee
Odeur Aucun danger (consensus) L´eg`eres irritations Maux de tˆete, ete, fonction fonc tion pulmonaire pulmon aire affect´ee ee si activit´ act ivit´e physiqu phys iquee (r´eversib ever sible) le) Fonction pulmonaire affect´ee Toux s`eche, douleurs dans la cage thoracique Facult´e de discernement affect´ee Pneumonie grave, danger de mort, perte de conscience d`es es env. 15 min.
< 0.6 ppm, 2 heures 1.5 ppm, 2 heures 9 ppm, intermittent d`es 10 ppm
Tab.
13.1.: Effets de l’ozone sur la sant´ e humaine
Transfert de masse efficace : avec un syst`eme eme Venturi-R´ enturi- R´eacteur-Cy eact eur-Cyclon, clon, l’on dissous disso us facilement plus de 95% d’ozone. Il ne faut donc pas accepter accep ter des syst`emes emes avec des efficacit´es es de transfert de masse plus faible. l’on ne fait fait pas cette cette s´ eparatio eparation, n, l’on l’on S´ eparation eparation des phases avant utilisation : si l’on aura des bulles de gaz au niveau du bac ou de l’appareil de lavage. Cela posera des probl`emes emes de s´ecurit´ ecur it´e pou pourr le personne per sonnel. l. Bulles d’ozone d’ozo ne dans l’eau et humains sont tout simplement incompatibles. Dans les contacteurs municipaux, personne n’est a` cˆot´ ot´e du bassin, bassin, l’on peut p eut donc avoir avoir des bulles d’ozone dans l’eau. Lorsque l’on produit de l’eau ozon´ee ee pour le lavage, lavage, il est essentiel de d e pr´evoir evoir un cyclon pour l’extraction des bulles de gaz
Contrˆ ole de la phase gazeuse : le gaz contenant l’ozone r´esiduel ole esiduel doit ˆetre etre conduit a` travers un destructeur catalytique d’ozone r´esiduel esiduel Destruction de l’ozone r´ esiduel esiduel en phase liquide : imp´eratif era tif,, sinon si non on d´etruit etr uit les condui con duites tes d’ea d’ eau u us´ee, ee , qui qu i en g´en´ en´eral er al ne sont so nt pas pa s r´esist es istant antes es a` l’ozone. Cette destruction peut se faire avec un simple filtre au charbon actif. Sortie Sorti e azote azot e du concen con centrat trateur eur d’oxyg` d’oxy g` ene ene dans la mˆ eme eme pi`ece ece : une erreur aussi classique que dangereuse consiste a` placer place r le concentrate conce ntrateur ur d’oxyg`ene ene dans une pi`ece ece s´epar ep ar´´ee ee de cell ce llee ou` a lieu le lavage. lavage. Avec le temps, la concentration conc entration d’oxyg`ene ene dans l’air augmente dans le local de lavage. Cela augmente le risque d’incendie, et peut causer des symptˆ omes omes semblables a` l’ivres l ’ivresse se chez les op´erateurs erate urs A´erat er atio ion n appro ap propri pri´ ´ ee ee de la pi` pi` ece ec e : c’est a` dire avec une sortie en bas, puisque l’ozone est plus lourd que l’air. le fait fa it qu’une q u’une entreprise ou une u ne collectiv co llectivit´ it´e pr´ef` ef`ere ere mettre m ettre en danger da nger la vie v ie de ces collab co llaborateurs orateurs qu’investir une somme de l’ordre du millier de francs suisses pour p our les prot´ eger eger est d’autant plus difficile `a comprendre comprend re que le prix pri x de tels d´etecteurs etecteu rs ne repr´esente esente qu’un qu ’un pourcentage p ourcentage faible de l’investissement l’i nvestissement
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14. 14. La disti distill llat atio ion n 14.1. Applicatio Applications ns La distillation de l’eau est une tr`es es vieille m´ethode ethode de traitement de l’eau, qui remonte a` l’antiquit´e. e. De nos jours, elle est de moins en moins utilis´ee, ee, essentiellement pour p our pour des raisons de coˆ ut. ut. La consom con sommat mation ion ´electr ele ctrique ique est ´elev´ ele v´ee, ee, ce qui signifi sig nifiee que qu e les le s coˆ couts ˆ de fonctionne fonct ionnement ment sont tr`es es ´elev´ elev´es. es. Et l’investissement l’investiss ement est important impo rtant pou pourr les installation instal lationss de taille significative. Aujourd’hui, cette m´ethode ethode n’est plus utilis´ee ee que dans l’industrie pharmaceutique et les laboratoires. La distillation reste la m´ethode etho de pou pourr la l a prod p roductio uction n des injectables injectables : les normes europ´ europ´eennes eennes exigent que lors de la production d’eau pour injectables la derni`ere ere ´etape etape de traitement soit la distillation. Hors industrie pharmaceutique, l’on trouve des distillateurs dans les laboratoires : un petit pet it distillateur distill ateur aliment´e en eau potable pot able repr´esente esente un investissement investisse ment limit´e — moins de 5’000.00 Francs suisses en g´en´ en´eral eral . La maintenance de ces appareil est simple, ce c e qui fait qu’ils sont int´ eressants eressants si l’on consomme co nsomme peu d’eau.
14.2. Principe Principe de fonctionnemen fonctionnementt Le principe de fonctionnemen fonctionnementt de la distillation distillation est tr`es es simple : l’on fait ´evaporer evaporer l’eau, l’e au, puis pui s on la conden con dense. se. L’eau L’e au est en mˆeme eme temps tem ps d´emin´ emi n´eralis´ era lis´ee ee et d´esinfe esi nfect´ ct´ee. ee. G´en´ en´eralement erale ment les distillateu distil lateurs rs sont des appareils appar eils assez fragiles, frag iles, employ´es es pratiqueme prat iquement nt uniquement en laboratoire et dans l’industrie pharmaceutique.
14.3. 14.3. Quali Qualit´ t´ e de l’eau l’eau disti distill´ ll´ee ee Souvent l’on imagine imagin e que l’eau distill´ distil l´ee ee repr´esente esente le nec plus ultra de l’eau l’e au purifi´ pur ifi´ee. ee. Cela n’est pas le cas. c as. Une s´erie erie de facteurs facte urs influencent influe ncent la qualit´ q ualit´e de d e l’eau l’ eau distill´ distil l´ee ee :
Chicane Chi canes, s, ´ el´ el´ ements eme nts de coalesc coal escenc ence e : ces ce s ´el´ el´ement em entss p erme er mett ttent ent de r´eduir ed uiree la quant qu antit´ it´e de gouttelettes entraˆ entraˆın´ees ees avec la vapeur. Les distillateurs ne donnent pas tous la mˆeme em e qual qu alit it´´e d’ea d’ eau. u. eter minante pou pourr la qualit´e de d e l’eau l ’eau produite pro duite : La vitesse verticale de la vapeur est d´eterminante une vitesse vites se basse r´eduit eduit la quantit´e de particules part icules et autres autr es impuret´ impur et´es es entraˆın´ ın´ees ees la ermet d’obtenir de l’eau de meill qualit´ qualit´
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´ DE L’EAU DISTILL EE ´ 14.3. 14.3. QUALIT QUALIT E
Fig.
14.1.: Sch´ema ema de principe d’un distillateur [9]
Mat´ eriaux eriaux de construction constr uction : les verre est employ´e pour p our les distillateur en laboratoire laboratoire. laboratoire. La production d’eau pour injectables injectables pr´esuppose esuppose l’emploi l’emploi d’acier inoxydable. La distillation est populaire dans l’industrie pharmaceutique car elle reste le meilleur moyen moye n d’´ d ’´elimi el imine nerr les l es pyrog` pyr og`enes en es..
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CHAPITRE CHAPITRE 14. LA DISTILLA DISTILLATION TION
Les distillateurs `a basse vitesse permettent d’obtenir l’eau disti is till l´ee ee sans sa ns d´emin em in´´erali ra lise serr avant. Les qualit´es es d’eau d’ea u produite pro duitess restent reste nt assez loin lo in de l’eau l’e au a` 18 MΩ/ MΩ/cm (ma ( max x th´eori eo riqu quee 18. 18.3 MΩ/ MΩ/cm) requise par l’industrie micro´electronique. electronique.
14.4. 14.4. Solutio Solutions ns pour pour r´ eduire edui re la consomma consommation tion d’´ energie energie Il y a deux technologies pour r´eduire eduire la consommation d’´energie energie des distillateurs : • La thermocompression thermocompression • L’utilisation d’effets multiples
14.4.1. 14.4.1. Effets multip multiples les L’´energe energe consomm´ee ee par un distillateur diminue lorsque le nombre d’effets augmente selon l’´equation equat ion suivante : Energie =
K N
(14.1)
Dans laquelle : • L’Energie L’Energie : souvent donn´ do nn´ee ee en kg de vapeur par kg de condensat c ondensat • K est une constante constante qui d´epend epend du distillateur, distillateur, dont la valeur est de l’ordre de 1.1 a` 1.2. • N est nombre d’effets du distillateur
Economi Eco nomie e d’´energi ene rgie e: Nombre Nombre d’effets d’effets 1 2 3 4
14.4.2. 14.4.2. Thermocomp Thermocompress ression ion
Energie Energie 1 0 0% 5 5% 3 9% 3 2%
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14.5. 14.5. LIMITES LIMITES DE LA DISTILLA DISTILLATION
Fig.
14.2.: Principe de la thermocompression [2 [2]
pharmaceutique, pharmaceutique, o` ou` le souci primordial primord ial est la croissance croissanc e des bact´eries, eries, l’on emploie l’acier inoxydable. inoxydab le. La n´ecessit´ ecess it´e d’employer d’empl oyer du d u m´etal etal limite l’emploi l’empl oi de la distillation distil lation.. En effet, il est impossible de produire de l’eau destin´ d estin´ee ee a` l’industr l’in dustrie ie micro´ mic ro´electroniqu elect roniquee en utilisant utilisa nt des appareils appareils en m´etal. etal. Il faudrait utiliser utiliser du plastique plastique inerte come le T´eflon, eflon, ce qui en pratique n’est pas possible. Cela explique que l’on n’utilise pas la distillation en micro´ mic ro´electr ele ctroni onique que..
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15. Proc´ ed´ es par ´ echange d’ions
15.1. 15.1. Intro Int roduc ducti tion on ` a l’´echan echange ge d’ion d’i on Le terme ´echa ec hang ngee d’io d’ ions ns regroupe un ensemble de technologie assez diverses, qui ont pour point commun d’utiliser des r´esines ne s qui ont la propri´ propr i´et´ et´e d’avoir des adh dh´´esio es ions ns pr´ef´eren rentiel ti ellles connues : un ion adh`ere ere plus ou moins a` la r´esin es inee : cett ce ttee prop pr opri´ ri´et´ et´e p erme er mett de construire const ruire des syst`emes emes o` u l’on l ’on ´echange echa nge des ions ion s contr c ontree d’au d ’autre tress de d e mani` m ani`ere ere cibl´ cib l´ee ee afin de changer change r la la p propr ropri´ i´et´ et´e de d e l’eau. l ’eau. Les ions que l’on veut relarguer relar guer dans l’eau sont app apport´ ort´es es a` la r´esine esi ne lors lor s de la r´eg´ eg´en´ en´eratio era tion n de cellecel le-ci. ci. Selon Sel on la r´esine et le produit r´eg´en´erant choisi, choi si, l’on l’o n obtient obt ient des syst` sys t`emes eme s aux propri´ pro pri´et´ et´es es diff´erentes ere ntes : ma gn´esium esium de l’eau Les adoucisseurs adoucisseurs permettent d’enlever le calcium et le magn´ permette nt de remplacer les ions pr´esent esent dans Les ´ echangeurs echang eurs d’ions proprement dits permettent + l’eau avec des ions H et OH , ce qui permet de d´emin´eral ra liser l’eau. −
Adh´ Ad h´esion si on pr´ef´ ef ´ erent re ntie iellle ` a la r´esin es ine e´ echa ec hang ngeu euse se d’i d’ ions on s : Cations Fer Alum Alumin iniu ium m Calcium Magn´esium esium
Anions Fe Phosphate PO34 Al3+ Sulfate SO24 Ca2+ Nitrate NO3 2+ Mg Nitrite NO2 3+
−
−
−
−
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15.2. 15.2. ADOUCISSEUR ADOUCISSEURS S D’EAU D’EAU
15.2. Adoucisseu Adoucisseurs rs d’eau d’eau Equations fondamentales Adoucissement 2RNa + MgSO4 → R2Mg + Na2 SO4
(15.1)
2RNa + Ca(HCO3 )2 → R2 Ca + 2NaHCO3
(15.2)
R´ eg´ en´ eration De l’eau sal´ee ee (saumure) (saumur e) est amen´ee ee au contact contac t de la r´esine esine ´echangeuse echang euse d’ions d’ion s : R2Ca + 2NaCl → 2RNa + CaCl2
(15.3)
C’est la vanne multivoies (ou tˆete ) de l’adoucisse l’ado ucisseur ur qui se charge des r´eg´ eg´en´ en´erations erat ions p´eriodiques erio diques de la r´esine esine en aspirant aspira nt de la saumure. saumure .
15.3 15 .3.. D´ emi emin´ eral eralis isat atiion par ´ echa ec hang nge e d’io d’ions ns 15.3.1. 15.3.1. Equations Equations fondamental fondamentales es Pour d´emin´ emi n´eralise era liserr l’eau, l’ea u, les ´echange echa ngeurs urs d’ions d’io ns emploie emp loient nt 2 types typ es de r´esine esi ne : anionique et cationique. cationique .
Cations ne utra ralilit´ t´e ´elect el ectrrique iq ue doit doi t ˆetre etr e resp r espect´ ect´ee ee : les l es cation cat ionss (+ ) sont remD´emin´ mi n´eral er alis isat atio ion n : la neut plac´es es par des ions hydrog`ene, ene, alors que les anions anion s ( ) rempla r emplac´ c´es es par des ions hydroxyde. Les ions hydrog`ene ene et hydroxyde r´eagissent eagis sent et donnent donne nt de l’eau. l’eau . Danss la premi` Dan pre mi`ere ere ´etape eta pe de la d´emin´ emi n´eralisa era lisatio tion, n, les cation cat ionss sont rempla rem plac´ c´es es par des ions ion s hydrog`ene ene : le ph de l’eau baisse. −
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´ ES ´ PAR ECHANGE ´ CHAPIT CHAPITRE RE 15. 15. PROC PROC ED D’IONS
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´ ´ ´ 15.3 15.3.. DEMIN ERALISATION PAR ECHANGE D’IONS
15.3 15 .3.2 .2.. R´ eg´ eg´ en´ en´ erat er atio ion n des de s ´ echa ec hang ngeu eurs rs d’io d’ ions ns ` a 2 lits li ts La r´eg´ eg´en´ en´eratio era tion n peut pe ut se faire fai re a` co-courant ou a` contre-courant . La r´eg´ eg ´en´ en ´erat ra tion io n a` contre-courant donne une meilleure qualit´e d’eau et permet d’´economiser economiser jusqu’` a 10% de r´eg´en´erant (a` dosa do sage ge ´elev´ le v´e). e) .
15.3 15 .3.3 .3.. Echa Ec hang ngeu eurr d’io d’ ions ns ` a lit lit m´ elan el ang´ g´ e Dans un ´echanger echanger d’ions a` lit m´elang´e, les 2 r´esines esine s sont m´elang´ elang´ees ees dans une seule colo co lonn nne. e. Le syst` sy st`eme em e de d e r´eg´ eg´en´ en´erat er atio ion n de d e la l a r´ r ´esin es inee est e st plus pl us comp co mple lexe xe.. Par Pa r cont c ontre re,, la l a qua q ualit lit´´e de l’eau obtenue est meilleure.
15.3.4 15. 3.4.. Pourquoi Pourqu oi l’eau l’ea u est-elle est- elle meilleur meil leure e apr` es es un lit m´ elang´ elan g´ e qu’apr` es es un deux-lits deux-li ts ? Les Le s r´eact ea ctio ions ns d’´ d ’´echan ech ange ge d’io d ’ions ns sont s ont des de s r´eact ea ctio ions ns a` ´equilib equ ilibre. re. Les L es subst su bstanc ances es ne r´eagisse eag issent nt pas compl`etement, eteme nt, mais m ais seulement seulem ent jusqu’au jusqu’ au point poi nt d’´ d ’´equilibre equili bre entre la d´eionisatio eioni sation n et e t la r´eg´ eg´en´ en´eratio era tion. n. Durant Dur ant la d´eionis eio nisati ation, on, la r´esine esi ne ´echange echa ngeuse use de cation cat ionss lib`ere ere de l’acide l’ac ide.. Dans un ´echangeur echange ur a` 2 lits, cet acide est `a disposition pour la r´eaction eaction en sens inverse inverse (r´ (r ´eg´ eg ´en´ en´erat er atio ion) n).. Da Dans ns un lit li t m´elan el ang´ g´e, e, l’ac l’ acid idee lib´ li b´er´ er ´ee ee est es t tout to ut de suit su itee neut ne utra ralilis´ s´e et enle en lev´ v´e par une bou boule le de r´esine esine ´echangeuse echang euse d’anions d’ani ons a` proximit´e. e. De mˆeme, eme, la soude produite pro duite par la r´esine esine anionique anion ique est tout de suite neutralis´ neutr alis´ee ee et enlev´ee ee par une boule bo ule de r´esine esine cationique a` proximit´ prox imit´e. e. Don Donc, c, dan danss un u n lit m´elang´ ela ng´e, e, la contrecont re-r´ r´eactio eac tion n ne n e se produi pro duitt pas, pas , a` d´efaut efa ut de r´eactant eac tants. s. L’´equilib equ ilibre re n’est n’e st pas atteint att eint avant la d´eionis eio nisati ation on presqu pre squee compl` com pl`ete ete de l’eau. l’eau . Du point poi nt de vue conceptue conce ptuel, l, un lit m´elang´ elang´e peut peu t aussi ˆetre etre d´ecrit ecrit comme une s´erie er ie infin in finie ie d’´echan ech ange geur urss a` deux lits.
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´ ES ´ PAR ECHANGE ´ CHAPIT CHAPITRE RE 15. 15. PROC PROC ED D’IONS
5. Lavage, Lavage, avec avec sortie a` mi hauteur, a` la limite entre les deux r´esines esines 6. M´elange ela nge de la r´esine esi ne avec de l’air l’ai r compri com prim´ m´e 7. Lavage Lavage co-courant pour stabiliser la r´esine esine 8. Remise Remise en service service Certains fabricants proposent des variantes de ce cycle.
15.4. Calcul des ´ echangeurs echangeurs d’ions 15.4 15 .4.1 .1.. Prin Princi cip p es g´ en´ en´erau erauxx Le calcul d’un ´echangeur echangeur d’ions se base sur 2 param`etres etres : • Le d´ebit ebi t maximum max imum • La capa ca paci cit´ t´e n´eces ec essa sair iree entr entree deux de ux r´eg´ eg´en´ en ´erat er atio ions ns
Le d´ebit ebi t d´etermi ete rmine ne une sectio sec tion n ou o u un u n volum vo lumee minimu m inimum m de d e r´esine, esi ne, alors alo rs que la capaci cap acit´ t´e d´etermine eter mine le volume minimum de la r´esine. esine . La capacit´ capac it´e de la r´esine esine et les d´ebits ebits surfaciques maximum admissibles sont donn´es es par fabricants de r´esine. esine. Il est raisonnable de demander demander aux fournisseurs fournisseurs la fiche de sp´ ecification ecification du fabricant fabricant de la r´esine, esine, et de v´erifi er ifier er que qu e l’´echan ech ange geur ur d’io d’ ions ns a ´et´ et´e dime di mens nsion ionn´ n´e en conf co nfor ormi mit´ t´e avec les le s sp´ecifi ec ifica cati tion onss du fournisseur fourn isseur de r´esine. esine.
15.4.2. 15.4.2 . Qualit´e de l’eau obtenue par ´ echange echange d’ions La qualit´e de l’eau que l’on peut obtenir en aval aval d’un ´echangeur echangeur d’ions d´epend epend du type typ e d’´echange echa ngeur ur :
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16. 16. Les Les anti antitar tartr tres es ´ elec electr trom omag agn´ n´ etiq etique uess 16.1. Passions et pol´emique emique Il est impossible de mentionner les antitartres ´electromagn´ electromagn´etiques etiques a` un praticien du traitement de l’eau sans d´eclencher eclencher les passions les plus vives. Alors que certains cert ains lancent des regards regar ds incr´edules edule s a` celui qui explique qu’il utilise un adoucisseur — Vous utilisez encor encoree les adoucisseurs adoucisseurs ? m’a lanc´ lanc´e une fois un entousiaste entousiaste des antitartres antitartres alors que nous discutions de l’alimentation d’une chaudi`ere ere a` vapeur — alors que les d´etracteurs etracteurs de ces appareils appareils aiment aiment se lancer dans de longues diatribes sur l’impossibili l’impossibilit´ t´e physique physique du fonctionnemen fonctionnementt des antitartres. antitartres. Le nombre nombre d’´ etudes etudes publi´ publi´ees ees sur ces appareils appareils est beaucoup moins important imp ortant que pour d’autres technologies de traitement traiteme nt de l’eau. D’apr`es es [17 17], ], cela peut s’expliquer en partie par le fait que cette technologie fut initialement d´evvelopp´ evvelopp´ ee ee surtout en Russie, et en Occident l’on tend a` ˆetre etre sceptique concernant toute tout e technologie techno logie provenant de l’Est. Pourtant Pourta nt plusieurs plusie urs ´etudes etude s ont montr´e l’efficacit´ l’effica cit´e de ces appareils appareils depuis les ann´ ees ees 1950 [31 31]] [32 32]. ]. Plus Pl usie ieur urss ´etud et udes es ont ´et´ et´es es pu publ bli´ i´ees ee s au cours des ann´ees ees 1990 concernant l’utilisation des antitratres ´electromagn´ electromagn´etiques etiques pour les eaux eau x us´ees ees [17 17]] [30 30]. ]. D’autre D’autr e part il y a aussi des ´etudes etude s r´ealis´ ealis´ees ees sur des bancs d’essai d’essa i qui ont montr´ montr´ les antitartres antitartres test´ n’avaien n’avaientt effet l’eau,
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´ ´ CHAPITRE CHAPITRE 16. LES ANTITAR ANTITARTRES TRES ELECTROMAGN ETIQUES
durant durant leur s´ejour ejour dans les canalisations canalisations.. Ils n’ont n’ont aucune tendance a` s’incruster ni dans les canalisations, canalisations, ni dans les installations installations ni dans les appareils a` prot´ pr ot´eger eg er.. 1. Une fois l’eau l’e au trait´ trai t´ee, ee, les ions io ns Ca++ et HCO3 se fixent fix ent pr´ef´ ef´erent er entie ielle lleme ment nt sur les germes de CaCO3 g´en´ en´er´ er´es es par l’appar l’ap pareil, eil, au lieu de former for mer de nouveaux cristaux sur les parois des canalisations (o` u des ph´enom en om``enes en es ´electro elect rochimique chimiquess peuvent p euvent conduir c onduiree a` une ´el´ el´evation evati on local lo calee de pH de l’eau, l’e au, la rendant r endant ainsi tr`es es fortement entartrante). Les Le s installations inst allations sont donc prot´ pr ot´eg´ eg´ees ee s contr co ntree de nouve no uveau aux x d´epˆ epots oˆts de calcaire incrustant, et les microcri cro crista staux ux seront ser ont v´ehicul´ ehi cul´es es a` travers l’installation jusqu’`a leur sortie lors de soutirages −
2. Un d´etartr eta rtrage age g´en´ en´eral era l de toutes tou tes les parois par ois m´etalliq eta lliques ues est induit ind uit par ces appareils qui d´etachent etachent le calcaire incrust´e sur les vieilles installations n’ayant pas ´et´ et´e prot´eg´ eg´ees. ees. Cette Cett e action actio n est progressive progr essive ; il demeure demeu re cependant un fin voile blanchˆatre atre protec p rotecteur teur constit c onstitu´ u´e d’ions positif p ositifss naturellement relle ment attir´es es par les parois paro is m´etalliques etall iques (` a cara ca ract ct``ere er e ´elec el ectr tron on´´egat eg atif if ). Ce voile isole et rend ´electropositive electropositive la paroi par oi en contact avec l’eau. Ceci contribue a` la long´evit´ evit´e de l’installation en limitant les effets de la corrosion.
Description Une s´erie erie de bobinages moul´es es autour de la chambre de traitement dans laquelle circule l’eau a` traiter re¸coit coit en permanence des impulsions ´electriques electriques d´eliv el ivr´ r´ees ee s par pa r le g´en´ en´erat er ateu eurr ´elec el ectr tron oniq ique ue,, a` une tension et une fr´equence equence d´etermin´ etermin´ees. ees. Un champ impulsionnel se trouve ainsi transmis par induction
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16.3. LIMITA LIMITATIONS D’EMPLOI D’EMPLOI
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17. Elec Electro trod´ d´ eioni eionisa sati tion on 17.1. 17.1. Princi Principe pe L’´electrod´ electrod´eionisation eionisation est pratiquement l’inverse l’inverse de l’osmose inverse. Des ´electrodes electrode s attirent les ions `a travers des membranes. Il y aussi un concentrat , comme pour l’osmose inverse, inverse, mais peu p eu (5-10%). La qualit´ qualit´e d’eau obtenue obtenue est excellente excellente : meilleure meilleure que celle obtenue obte nue avec un ´echangeur echang eur a` deux lits, mais pas tout `a fait aussi bonne que avec un lit m´elang´e.
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´ 17.2. AVANTAGES ANTAGES ET D ESAVANTAGES
3. Les ions hydrog`ene ene et hydroxyle sont amen´es es par force ´electrostatique electrostatique dans la chambre ”C”. La product pro duction ion continuelle continue lle de ces ions r´eg´ eg´en` en`ere ere en continu les lits de r´esin es inee ´echa ec hang ngeeuse us e 4. Les ions i ons pr´ p r´esents ese nts dans da ns l’eau l’ eau sont abso a bsorb´ rb´es es par pa r la r´esine esi ne ´echange echa ngeuse use d’ions d’io ns et e t migrent mig rent dans la chambre ”C”. 5. Dans la chambre chambre ”C”, les ions hydrog` ene ene et hydroxyle hydroxyle se combinent combinent pour p our former de l’eau 6. 90% a` 95% de l’eau entrant dans la cellule sort de la cellule `a travers la chambre ”D”” sous ”D so us form fo rmee d’ea d’ eau u d´emin´ em in´eral er alis´ is´ee ee 7. Le concentrat conc entrat est recircul´e, e, comme souvent dans les osmoseurs 8. le concent con centrat rat peut pe ut ˆetre etr e r´einjec ein ject´ t´e en d´ebut ebu t de chaˆ chaˆıne de traite tra itement ment
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´ CHAPITRE CHAPITRE 17. 17. ELECTROD ELECTRODEIONISATION
Fig.
17.3.: Exemple Exemp le d’´elecrod´ elecr od´eionisateu eionis ateurr pou pourr 6 m3 /h. Dimensions 117 × 134 × 214
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` ´ 17.3. 17.3. PROBL PROBLEMES RESULT ESUL TANTS D’ASPECTS COMMERCIAUX COMMERCIAUX
17.3. 17.3. Probl` Probl` emes emes r´ esultant esul tantss d’aspe d’as pects cts commerci comm erciaux aux L’´electro elect rod´ d´eionisation eionis ation fut longtemps longt emps un brevet de la soci´ soc i´et´ et´e US-Filter US-Filt er (Aujourd’hui (Aujou rd’hui int´egr´ egr´ee ee dans Vivendi Waters). ater s). Lorsque Lors que le brevet est tomb´e dans le domaine domai ne public au d´ebut eb ut des de s ann a nn´´ees ee s 199 1 990, 0, plus pl usie ieur urss so s o ci´et´ et´es es ont ont com c omme menc nc´´e a` produi pro duire re des ´electr ele ctrod´ od´eionis eio nisate ateurs urs.. La technologie techno logie ´etant etant difficile a` maˆ maˆıtrise ıtr iser, r, une seule seu le soci´ so ci´et´ et´e a acquis acq uis une part par t de march´ mar ch´e importante : il s’agit de E-Cell, filiale de General Electrics. E-Cell produit essentiellement les cellules, laissant `a des int´egrateur egra teurss le soin so in de construire const ruire la machine mach ine compl` co mpl`ete. ete. Pour pouvoir p ouvoir prop p roposer oser une machine m achine avec une cellule c ellule E-Cell, E-Cell , l’int´egrateur egra teur doit d’abord acheter une licence E-Cell et suivre une formation assez coˆ uteuse. Les int´egrateurs egra teurs avec licence licenc e E-Cell sont donc tr`es es motiv´es es a` vendre un grande nombre d’´electrod´ elect rod´eionisateu eioni sateurs, rs, Cette situation situat ion cause aussi un autre autr e probl` p robl`eme, eme, que peu de clients remarquent rema rquent : l’´eletronique eletr onique de puissance puiss ance d’un ´electro elect rod´ d´eionisateu eionis ateurr est tr`es es complexe comple xe : la plupart des clients d’E-Cell d ’E-Cell ach`etent etent donc leur ´electronique electronique de puissance aux USA, chez E-Cell. E-Cell . Cela Ce la peut peu t poser p oser un probl` p robl`eme eme en cas de pannes, panne s, puisque p uisque ces ´electrod´ elect rod´eionisateur eionis ateurss sont ´equip´ equ ip´es es de d e de compo com posant santss d’´electr ele ctroni onique que de puis p uissan sance ce am´ a m´ericai eri cains ns aux a ux norm n ormes es NEMA N EMA,, que l’on ne trouve trouve pas ou difficilemen difficilementt en Europe : la panne peut donc ˆetre etre prolong´ prolong´ee ee de pi` de rechange.
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´ CHAPITRE CHAPITRE 17. 17. ELECTROD ELECTRODEIONISATION
de conduc con ductiv tivit´ it´e d´eclench ecl enchant ant l’alarm l’al armee ”con ” conduc ductiv tivit´ it´e” e” de l’alime l’a limentat ntation ion de la chaudi` chau di`ere ere de 1 µS/cm a` 3 µS/cm.
17.4.2 17. 4.2.. Cellule Cell ule myst´ my st´ erieuse erie use Une soci´ so ci´et´ et´e de micro´ mic ro´electr ele ctroni onique que avait choisi choi si l’´electr ele ctrod´ od´eionis eio nisati ation on sur la base bas e du coˆ cout ˆ d’inves d’investisseme tissement. nt. Un fournisseur fournisseur de mat´ eriel eriel de traitement traitement d’eau proposait un nouvel ´elecrod´ elecr od´eionisateu eioni sateur, r, avec des cellules cellu les d’´electro elect rod´ d´eionisation eionis ation de fabricatio fabri cation n propre. propr e. Au bout de 6 mois de fonctionnement, les cellules d’´electrod´ electrod´eionisation eionisation se bloqu`erent. erent. Au
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18. D´ egazage
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´ CHAPIT CHAPITRE RE 18. DEGAZAGE
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´ 18.3. 18.3. LES NOUVELLE NOUVELLES S TECHNOLOGIE TECHNOLOGIES S DE D EGAZAGE
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´ CHAPIT CHAPITRE RE 18. DEGAZAGE
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´ 19.2 19.2.. DELAIS
19.2 19 .2 D´ elai el ai
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CHAPITRE CHAPITRE 19. 19. INTRODUCT INTRODUCTION ION
19.3. Caract´ eristique eristique de l’eau d’alimentation d’aliment ation
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´ D’EAU N ECESSAIRE ´ 19.4. 19.4. QUALIT QUALIT E
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