303375224-Design-of-Slow-Sand-Filter-Final.xls

 Adavisomanal  Adavisomanal and 30 Villages Villages

Jal NIrmal Project

Design of Slow sand filter  Adavisomanal & 30 Villages  As per CP!!" man#al cla#se the economical cost design o$ slo% sand $ilter to &e adopted 'otal (#antit) o$ %ater per da) to &e treated

3*00

C#m + da)

Since slo% sand $ilters %ork $or ,- hrs a da) the (#antit) to &e $ilter per ho#r  .

3*00 ,-

.

/0

C#m + per ho#r  

'he rate o$ $iltration $or slo% sand varies &et%een 01/ 2 to 01, sedimentation process $ollo%ed &) Ra% %ater s torage tank 3 hrs 4 s torage5 has &een provided6 the the rate rate o$ $iltr $iltrat atio ion n in this this can can &e adop adopte ted d 01/ 01/0 0 2 + hr1 hr1 .

'here$ore6 'he area o$ slo% sand $ilter &ed re(#irement

/0 01/0

.

/000

2

per ho#r1 Since

S(m

 As per CP!!" man#al * Nos o$ $ilter &eds are to &e provided1  As per economical cost design page 4 ,-/5 l, . n &

.

, A 8

/

 n

8

/ 5

7here l . & . A . n .

l

, n  A

.

n

l

&

 As s#r$ace %orks o#t 9ess than /,00 S(m1  As per CP!!" man#al6 n#m&er n#m&er $ilter &eds re(#ired is

'here$ore6 l

l

9ength o$ %all &readth o$ %all 'otal s#r$ace area o$ $ilter &ed Nos o$ $ilter &eds

A

.

;

l

,

.

, ;

< 8

,

.

l . Sa) . 'here$ore6 A . /000 & . & . Sa) &

<

.

;

& /000

/

,000 . = /-1=0>//=; /100 ; < l .



,,,1,,,,,,,,

2 <

< /100 /000 / < ; ;13333333333 ;1 2

& <

&

:#t provide

; Nos1

 Adavisomanal and 30 Villages

Jal NIrmal Project

'here$ore6Area provided is /100 < ;1 'here$ore6 !ach &ed %ill have 9ength &readth . ;1

S#r$ace area o$ each &ed

m .

;

No o$ :eds 2

2

.

'otal S#r$ace area o$

; /

/,>1

&ed

.

S(m /,>1

<

;

.

/0,0

?

/000 S(m

ence "k Cheak for Over loading 9et #s ass#me / @ilter &ed is 7ashed at a time @ilteration capacit) o$ each $ilter

. /



/0 ;1

. 01, C#m +hr <

> ence "k

'he schematic la) o#t o$ slo% s and $ilter &ed &e as #nder  Design of Filter Bed

Let filter bed be as under with over all depth of filter bed =

0.20mt Free board

1.0mt supernatant water  2.7 1.0mt Initial loading of filter Sand

0.40 mt ravel

0.10 mt !nder drain

Sand Sp"ifi"ation Si#e of sand

= 0.2$ 0.% mm

!niformit& "o$ef =

'

raval Sp"ifi"at = '.0 la&ers (0.4 m) Si#e of garval

= 2.0 mm 40 mm

Si#e o f garv al i

= 2.0

'

depth in mm

= *0

*0

10 *0

20 *0

40 *0

2.70 mt

. 1, C#m +hr  

 Adavisomanal and 30 Villages

Jal NIrmal Project

Design of under Drain

+rea of ea"h filter

=

1'.00 ,

*.'

ratio of area of perforation to area of filter rovide area of perforation

=

=

0.1'/ to 0.% /

0.112'

S-m

112.' S-"m

3atio of total perforation to total S area of latral for perforation of 12 mm

= 2 to 1 / "ross se"tional area

5otal ross se"tional area of latrals

= =

+rea of "entral manifold

=

1.'

=

1.'

,

2*6*.* S-"mt

,

2*6*.7'

4%0%.12' S-"mt

ross se"tion of "enter manifold with depth of 100 "mt therefore width of "entral manifold

=

4%0% m

Provide central manifold of 60 cmt depth ,75 cmt wide Design of Lateral:

+ssuming 6% mm dia of  "mt latral  8ow internal 9ia of 6% mm dia  ipe =

'*.1 mm

5otal +rea of laterls S +rea of one Lateral =

2*.6*7'

=

110 8os.

0.7*',0.0'*12 Spa"ing of Laterals=

1'

=

'' Length of Laterals on ea"h side =

0.27% m Sa&

2'0mm 

:idth of filter bed $ :idth of anifold 2 =

*.'

$

0.7'

=

%.*7'm

2 :hi"h is Less 5han %.7*(60,.06%=%.7*m)

;en"e < 

Design of !rifice:

+rea of
0.2

>

1'

>

*.'

100 =

0.112'

S-m

+dopting Spa"ing
%.*7'

=  8o. of
,

100 ,

S- ts

= 0.1'  100 , 127.' =

 8o. of Laterals =

127.'

,

100

%*7.' m

,

100 2

=

 8os.

11%

 Adavisomanal and 30 Villages

5hus provide mm
Jal NIrmal Project

 Adavisomanal And 30 Villages

Jal Nirmal Project

 Design !f "edimentation tan# 5otal demand :ith 20 hrs pumping

= = =

9etention provide =

%600 um9a& 1*0 um9a& %

;rs

apa"it& Sedimentation 5an =

%>

1*0

= '40 um

If two units provided "apa"it& of ea"h unit

=

 '40 2

= 270

um

with average water depth in tan as %.0 mts? Surfa"e area of tan

=

 270 %

= 0

S-m

Length to :idth ratio is 1 @ % =

%A2 = 0 S-m A = '.4* Sa& '.'  L = % , '.'0 = 16.'ts So? rovide 16.' ts > '.' ts of ea"h unit 5otal +rea rovided = 0.7' S-m B 0 S-m < 5otal area provided = 2 (16.' , '.' , %.0) = '44.'"um B '40 um ;en"e?
!nit 1 '.' ts

!nit 2

'.' ts

16.' ts

he" for Surfa"e loading =

%600 0.7' , 2.0

=

1.*40

umS-m9a&

D

%6 umS-m9a&

;en"e < 
= =

% E 0.% 0 (FA) E 0.% (Sluddge) E %.6 ts

$nlet %nd out let &eir

Inlet weir (Influent "hannel with bottom openings ) eeping velo"it& of water in "hannel

=

0.% mse"

and eeping width of "hannel as

=

For dis"harge of 1*0 umhr i.e.

=

9epth of "hannel in ea"h unit

0.% m 0.0' umse" 0 0'

=

0 2* ts

 Adavisomanal And 30 Villages

Jal Nirmal Project

5he "ross se"tion of Influent "hannel = 0.%, 0.% m he" for weir loading Length of wier in eah unit = '.' ts Flow per unit per da& = %600 2 = 1*0 um hr   5herefore weir loading = 1*00 '.' = %27.27 "um  mt da& Aetween 100 $%00 "um mt  da& +s it ismore %00umm da& Let us in"rseth length of weir to 6.' m  8ow 5he odified dimension for the Sedimentation 5an is Length of Sedimentation 5an = +rea of s 0 1%.*46 = = Areadth 6.' Sa& 14  he" for weir loading Length of wier in eah unit = 6.'m Flow per unit per da& = %600 2 = 1*0 umhr   5herefore weir loading = 1*00 6.' = 276.% "um  mt da& Aetween 100 $%00 "um mt  da& ;en"e <  %600 he" for Surfa"e loading = = 1.7*0 umS-m9a& D %6 umS-m9a& 1 , 2.0 ;en"e <  'hus the Final Dimension %re ( ) "ets *+ m  6-5m *+-0 .ts

6-5 .ts

6-5 .ts *+-0 .ts

Aottom floor slope 1 @ 12 For Sludge removal? let is divide the Ao, Slab in ea"h tan into 2 halves longitudinall& and slope be provided in word to mae into to two hopper of %0 , %0 m in the "enter and sludge removed b& b& sludge pipe. 5o e"onomies "onstru"tion "ost? let the tans be "onstru"ted ba" to ba" longitudinall& to ensure e-ual flow into sedimentation tan a distribution bo, with re"tangular weir and flush t&pe inlet valve to ea"h tan.

For uniform dispersal of flow of water provide perforated baffle wall in front of inlet pipe at 1.2  awa& from the wall.

/draulic Design of 1affle wall

Flow in ea"h 5an = 1*0 umhr = 0.0' umSe" elo"it& of Flow of flow of water for dispersal = 0.1' Se" +rea of opening re-uired  in baffle wall = %

0.1'

= 0.%%% S-m

0.1'


= 6.2' $ (0.2,%) =

+rea of opening available

=

'.6'  '.6' , 0.2 = 1.1% S-m.

 Adavisomanal And 30 Villages

Jal Nirmal Project

Let us provide 1' , 1' m S-uare opening in the wall as under.

 Adavisomanal and 30 Villages

Jal Nirmal Project

Design of Pipe from Raw Water Smp !o Distri"tion #o$ No1 o$ @ilter :eds. ; Nos Bt) o$ %ater to &e 'reated. /0 C#m+r  Bt) o$ %ater to &e 'reated &) pipe. /0 C#m+r   010-/*> C#m+Sec =  Ass#ming the Velocit) o$ $lo% In the pipe as. 01 2+sec Dia o$ pipe. 010-/*> < 01 < 31/-, 013,> = Provide ,0 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V. 010-/*> 01>;  01,  01, 01; 2+sec = ence "k Cal%lation Of ead 'osses in pipe( 9ength o$ pipe. 30 m aen 7illam Constant. /00  Area o$ Cross Section in pipe A. 31/-,  ,0  ,0 = 7etted perimeter . 31/-, < ,0 >;1 mm = )dra#lic 2ean Radi#s r . *,1 mm 010*, m = 1*3 01No%6 Accroding to aen 7illams @orm#la V. B+A.01;-C r 
-=0=- mm,

01*3

010*,

<

01-

S

Design Of inter%onne%ting )rom Distri"tion tank*+nlet ,-idistr"tion Retanglar Weir. )or Slow sand )ilters Since Separate pipes Are 'o&e ive @rom Distri&#tion 'ank to SS@ Dischage In each @ilter. 0100,/ C#m+Sec  Ass#ming the Velocit) o$ $lo% In the pipe as. 01 2+sec Dia o$ pipe. 0100,/ < 01 < 31/-, 01//, = Provide /00 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V. 0100,/ 01>;  01/  01/ 01** = ence "k Cal%lation Of ead 'osses in pipe( )or SS) /SS) 1 on either side 9ength o$ pipe. 30 m aen 7illam Constant. /00  Area o$ Cross Section in pipe A.

31/-, 

/00 

/00

=

7etted perimeter . 31/-, < /00 3/-1, mm = )dra#lic 2ean Radi#s r . , mm 010, m = 1*3 01No%6 Accroding to aen 7illams @orm#la V. B+A.01;-C r 
>; mm,

01*3

010,

<

01-

S

 Adavisomanal and 30 Villages

Jal Nirmal Project

)or SS) 2SS) 3 on either side 9ength o$ pipe. / m aen 7illam Constant.  Area o$ Cross Section in pipe A.

/00 31/-, 

/00 

/00

=

>; mm,

7etted perimeter . 31/-, < /00 3/-1, mm = )dra#lic 2ean Radi#s r . , mm 010, m = 1*3 01No%6 Accroding to aen 7illams @orm#la V. B+A.01;-C r  m "#t let R9 at Distri&#tion :o<. =103 2 inlet R9 at Distri&#tion Cham&er. =-1=-; 2

01*3

010,

<

01-

S

Design Of inter%onne%ting )rom Slow sand )ilters Ot let to Rre Water Smp "ne o$ Slo% Sand @ilter . ; Nos1 Bt) o$ %ater to &e 'reated. /-31> C#m+r   Bt) o$ %ater to &e 'reated &) each pipe. />1=*;; C#m+r  0100-== C#m+Sec = a )rom SS) / to 4n%tion SS)2 Since pipes Are inter connceted $rom SS@ / to SS@, Discharge in pipe . 0100-==/3 C#m+Sec  Ass#ming the Velocit) o$ $lo% In the pipe as. 01 2+sec Dia o$ pipe. 0100-== < 01 < 31/-, 01//,> = Provide /00 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V. 0100-== 01>;  01/  01/ 01*3* 2+sec = ence "k Cal%lation Of ead 'osses in pipe( 9ength o$ pipe. / m aen 7illam Constant.  Area o$ Cross Section in pipe A.

/00 31/-, 

/00 

/00

=

< /00 3/-1, mm = , mm 010, m = 1*3 01V. B+A.01;-C r  m "#t let R9 at Slo% Sand @ilter . =31;; 2  R9 at "#tlet o$ SS@ , . =31>=; 2

>; mm,

7etted perimeter . 31/-, )dra#lic 2ean Radi#s r .

" )rom SS) 2 to 4n%tion SS)3 Since pipes Are inter connceted $rom SS@ ,to SS@3 Discharge in pipe . 0100==;,* C#m+Sec  Ass#ming the Velocit) o$ $lo% In the pipe as. Dia o$ pipe. =

01 2+sec 0100==; 01 01/=-

< <

31/-,

01*3

010,

<

01-

S

 Adavisomanal and 30 Villages

Jal Nirmal Project

Provide /0 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V.

0100==; 01>;  01/ 01* 2+sec ence "k

=



01/

Cal%lation Of ead 'osses in pipe( 9ength o$ pipe. / m aen 7illam Constant.  Area o$ Cross Section in pipe A.

/00 31/-, 

/0 

/0

=

/>*>- mm,

7etted perimeter . 31/-, )dra#lic 2ean Radi#s r .

< 3>1

->/13 mm = 0103> m = 1*3 01No%6 Accroding to aen 7illams @orm#la V. B+A.01;-C r  01;< /00 < = S 0100-=; m+m = @rictional 9osses. 010;,/> m  R9 at "#tlet o$ SS@ , . =31>=; 2  R9 at "#tlet o$ SS@ 3. =31>/* 2 % )rom SS) 3 to 4n%tion SS)1 Since pipes Are inter connceted $rom SS@3 to SS@Discharge in pipe . 010/-=>- C#m+Sec  Ass#ming the Velocit) o$ $lo% In the pipe as. Dia o$ pipe. =

/0 mm

01 2+sec 010/-=> 01 01/=3

< <

31/-,



01/

01*3

0103>

<

01-

S

Provide /0 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V. =

010/-=> 01>;  01/ 01;-; 2+sec ence "k

Cal%lation Of ead 'osses in pipe( 9ength o$ pipe. 30 m aen 7illam Constant.  Area o$ Cross Section in pipe A.

/00 31/-, 

/0 

/0

=

/>*>- mm,

7etted perimeter . 31/-, )dra#lic 2ean Radi#s r .

< /0 ->/13 mm = 3>1 mm 0103> m = 1*3 01V. B+A.01;-C r  /* 2 inlet R9 at Distri&#tion Cham&er. =31/ 2

01*3

0103>

<

01-

S

 Adavisomanal and 30 Villages

Jal Nirmal Project

d )rom SS) 1 to pre Water Smp Since pipes Are inter connceted $rom SS@3 to SS@Discharge in pipe . 010/==*3 C#m+Sec  Ass#ming the Velocit) o$ $lo% In the pipe as. Dia o$ pipe. =

01 2+sec 010/==> 01 01,,

< <

31/-,



01,

Provide ,00 mm Dia CI Pipe No%6 Velocit) in pipe V.B+A V. =

010/==> 01>;  01, 01*3* 2+sec ence "k

Cal%lation Of ead 'osses in pipe( 9ength o$ pipe. 30 m aen 7illam Constant.

/00

 Area o$ Cross Section in pipe A.

31/-, 

,00 

,00

=

3/-,0 mm,

7etted perimeter . 31/-, )dra#lic 2ean Radi#s r .

< 0

,00 mm

*,;1mm = 010 m = No%6 Accroding to aen 7illams @orm#la V. B+A.01;-C r 1*3 2

01*3

010

<

01-

S