Design of Mixing Basin Round end bafe. Bafe Type Over and under ow bafes bafes Mechanically agitated type basins. Design o MB’s or bafe bafe type type MB’s MB’s ollow ollowing ing point points s are are to be noted. noted. Based Based on conven conventio tional nal practice. !. "eloc elocit ity y o ow in the chann channel els s bet bet n bafes bafes # $.!%&$.' $.!%&$.' ()sec *$.% to !.$ !.$ t)sec+ ,. Mi-ing Mi-ing period period or detent detention ion ti(e ti(e # ,$ to %$ (ins. (ins. '. Distance Distance betwee between n bafes bafes # %$ c( c( # $.% ( *! *! inches inches++ /. Re0ui e0uirred dept depth h o chann channel el or or bafe bafes s o the the roun round d the the end end type type (ay be calculated ro( Depth o channel #
1&2ectional area o each channel Distance between bafes.
%. Re0uir e0uired ed width width o the channe channell or bafes o over over and under under type (ay be calculated ro(. 3idth o channel #
1&2ectional area o each channel Distance between bafes.
P-26, M.A.Aziz Book Example. 4 (i-ing basin with a round the end bafes is to treat '(gd o raw water. water. The basin is to be divided into two si(ilar parts by longitudinal partition wall so that each hal will have a clear width o l$t. 3hat should be *a+ the depth o the basin *b+ the nu(ber o channels channels and over over all inside inside length o the tan56
Soln. 7et us 4ssu(e8 Distance bet n bafes bafes # ! inch 8 Mi-ing Mi-ing period period # ,$ (ins "elocity "elocity o ow # $. t)sec 9lea 9leara ranc nce e betw betwee een n end end o eac each h bafe bafe and and wal walll # !.% !.% 1 n distance bet bafes. :nlet
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Outlet
"elocity o ow # $. )sec # / t)(in *a+ Total distance the water will travel travel # (i-ing period 1 "el. o ow # ,$ 1 / # ;<$ t "olu(e o water to be (i-ed with coagulant in each period o ,$ (ins. #
' 1 !$< 1 ,$ <$ 1 ,/
# /!<=$ gallons # %%=$.% ct
>=./ gal#! ct?
%%=$.% 1 @ 2ectional area o each channel bet n bafes # ;<$
# %.$ t,
2o8 Depth o each basin # %.$)!.% # '.< t A / t. 4ns. *b+ 9learance 9learance bet betn end o each bafe and the wall # ,= inch # ,.,% t Cective length o each channel is # !$ @ ,.,% # =.=% t o o channels # ;<$)=.=% # !,'.= A !,/ 4ns. *c+ o. o channels channels at each hal hal o basin # !,/), # <, o o bafes at each hal o basin #
Soln Daily ow rate # ,$$ 1<$ 1 <$ 1 ,/ # !=., 1 !$ < 7 4lu( re0uire(ent re0uire(ent ' (7 o !$ g)7 # '$ (g 1 !=., 1 !$ <7)d # %!./ Ig)d 7i(e re0uire(ent re0uire(ent !. (7 o % g)7# ; (g)7 1 !=., 1 !$ <7)d # !%%.% 5g)d Jolyelectrolyte Jolyelectrolyte # $., (g)7 1 !=., 1 !$<7)d # './< 5g)d
KEx-11-6 G kiely p-461. 4 water water treat treat(en (entt plant plant consi consists sts o the ollow ollowing ing unit unit proce process ssesL esL coagul coagulati ation on
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co(plete reaction o alu( or alu(inu( hydro-ide occurs and ; total solids are re(oved by sedi(entation) ltration.
Soln of 4lu( P # $./, (')2 9! # %$ %$$ $ (g)7 (g)7
TJ
P # $./, (')2 2ludge udge Treat eated wate waterr 9 $ # $.$, 1 9!#!$ (g)7 0 9s
Material balance or 22L 4ccu(ulation 4ccu(ulation # :nput&Output E Qeneration @ 9onsu(ption 3ithin 3ithin 2yste( 2yste( 3ithin 3ithin 2yste 2yste( (
$
# :nput @ Output $
$
Thereore8 Thereore8 :nput # Output P9! # P9$ E 0cs or 0cs # P *9!&9$+ # $./, *%$$&!$+ or 0cs # $./, 1 /;$ # ,$%. g)s Material balance or 4lu(inu( hydro-ide 4l,*2O/+'.!/ N,O E 6 ,4l *ON+' E 6 E 6 %;/ g()(ol !%< g()(ol i8e
%;/ g( o alu( produces !%< g( alu( hydro-ide *2ludge+ 156 594
!
156 594 1 ,! # %./< g()s *P 1 9+ %$ (g)7 *,! g()s+ Thereore Thereore Total Total 2olid # 2 2 re(oved E alu( hydroo-ide hydroo-ide 2ludge 2ludge # ,$%. E %./< # ,!!.,< g()s # ,!!.,< 1 '<$$ 1 ,/)!$ <# t)day
5g)d 5g)day ay
#
F or a 3TJ o raw water ow '
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Design a slow sand lter to treat a ow o $$ ( ')day. )day. 4ssu(e a ltration rate o $.!% ()h and 7LB # ' L , 800
Soln
4rea o tan5 # 3idth #
√
24 × 0.15
222.22 3
=
=
222.22m
2
12.17 m
2
7ength # !.% 3 # !.,% (
2o8 net area #!,.,%( 1 !.,%(
7et us assu(e Neight Neight o under under drain drain syste( syste( # $.% ( R2 Neight o ilter bed # $.; ( 2upernatent water # ! ( R2 Total Total Neight o tan5 # ,./ ( A ,.% (
*$.= ( or R2+
Design a R2 a R Qravity to treat t reat '
4rea # 24 × 12 N# ,., (
Soln
= 126.39m
2
3#;., ( A ;.,% (8
7# !'.=< A !/.$$(8
Page age !2" !2" Pea Pea#y #y $ %o& %o&e e P'o( P'o(le lem m 6-2 6-2 Deter(ining 2torage reservoir capacity Mon)* %+n o o % Mon)* %+n o % 6 ! 1/ m 1/6m! ! , ' / % < = ;
;.$ !$. /., ,. !., !.! $.; $.% $.<
!$ !! !, !' !/ !% !< != !
$./ $.% $.; !.! ,.$ %.% !$.% '.% ,.%
2oln Mont h
Run oC PR 1 !$<('
9u(ulative Run Run oC
!
;.$
;.$
3ater 2upply P2 1 !$<(' ,
Decit *PR @ 9u(ulative P3+ 1 Decit !$<(' =.$ $.$ *=+
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Detn the capacity o a 2torage reservoir read to (aintenance a constant 32 *drat+ o , 1 !$<(')(onth given the ollowing (onthly (ean run oC valves.
Sedimentation Tank Design Problem: Design
a rectangular sedimentation tank to treat 2.4 million litres of raw water per day. !e detention period may "e assumed to "e 3 !ours.
Solution: #aw
water flow per day is 2.4 $ 106 l. Detention period is 3!.
%olume of tank & 'low $ Detention period & 2.4 $ 103 $ 3(24 & 300 m3 )ssume dept! of tank & 3.0 m. *urface area & 300(3 & 100 m2 +(, & 3 -assumed. + & 3,. 3,2 & 100 m2 i.e. , & 5.8 m + & 3, & 5.8 / 3 & 1.4 m ence surface loading -erflow rate & 2.4 $ 106 & 24000 l(d(m2 40000 l(d(m2 -
