WTP Design 3.12 MLD

8/16/2019 WTP Design 3.12 MLD

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1 Treatment Plant Ca

Design Wa

OperationRaw Water

2 Inlet tank

3 Horizontal Flow ar


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4 Design of Rectangula

Loadi ! o"er#ow r

"s = "o =

For ideal settling #asi

o$er(ow rate for )**


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n=

$imen%ion o& Tank

urface ar

hec! against resusp

Flow $elocity ,$ / that

Howe$er& due to shore5ciency of minimu

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In#uent %tructure

9n(uent channelPro$ide *.8m

*.2m

That runs across thePro$ide -in the inside wall of i

: #a;e wall of )m de

Efuent 'tructure The components of ee;uent weire;uent launderoutlet pipe

Weir length and num

Weir loadingpacing #etween $ n

>um#er of ?*@ " not

To a$oid resuspensio#e less than critical d

The in(uent structurewidth and throughoutan in(uent channel& s


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Pro$ide an e;uent laWidth of the laundercritical depth at the e

Depth of water at up

:mounting for head lPro$ide the diameter

'low 'and Filter

6nclosure Tan!0 Beds

i%e of each Filter #e

Depth of tan! =

=2 y


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Filter (edia )'and*sand layer placed o$eCecti$e si%e ,D)*/ ouniformity coe5cient

The top *.)2 m layer

+a%e (aterial ),ra#ase material is gra$si%e of gra$el in the #in the intermediate lain the top most layer

-nder draina e %y%: entral Drain of si%

Clear .ater /e%er"

i%e of the

C0emical 'tore!Ho:lum mi ing and dosi:de'uate space for 8

raded gra$el of *.-a#sorption of


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$e%i n o& lum 'ol

lumC0lorine


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pacity

ter Demand for the ultimate design year = 8)-**** Eit0day= 8.)- ED

Hrs. of WTP = -4 HrsFlow = 83.)))))))))) Eit0 ec

ay = 83 Eit0 ec

Hydraulic Retantion Time = )* inutes"olume re'uired = ,*.**4 cumec )*min 3*sec/

-).3 cu#ic met

Water depth in tan! ,assumed/ - m:rea re'uired )*.1 s'. m.

i%e of s'uare tan! 8.-?

Dimensions of 9nlet Tan! , 'uare si%e/= 2m 4m -.2mpro$ided 3m 2m 8m

Free #oard *.2 m und and End bafed Flocculator

Total "olume to #e treated = 8))*4** Eit0DayDetention Time in the #asin = )2 to 8* inutes

Ta!e 8* inutes

"ol of water treated in 8* minutes= 341** Eiter34.1 cu#. eter

"elocity of (ow in the (occulator *.- m0secEength of (ow ,in 8* minutes/ 83* meter

*.)1 s' meterDistance #0t the #a;es *.2* mWater depth in channel *.83 mPro$ide water depth ) m

Hence& $elocity in the channel *.*3G 0 ,) *.2/ *.*G-

*.G2 m

>ow& length of (ow )-?.3 m

Re'uired ross ection of channel #0w the #a;es,)-*.3 0 83*/

lear opening #etween the end of each #a;es andthe wall may #e ta!en as

The tan! is di$ided in to two compartments #y pro$iding a longitudinal partition*.- m and each half may ha$e a clear width of 4 m ,assumed/


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6Cecti$e length of each channel =).-2 m

>um#er of channel re'uired = )*8.G nos.Hence& num#er of channels in each half = 2).1 nos.

-2.? m:ssuming the thic!ness of each #a;e = *.) m

The o$erall length of the of the tan! = 8) mFree #oard = *.8 m

Dimension ,inside/ of the Tan! = ,-- m 4.- m ).2 m/

edimentation Tan!

Design (ow rate = 8))*4** Eit 0 day)-?.3 cum 0 hr

:$erage particle si%e to #e remo$ed= *.*- mm:ssumed performance of ettling tan! = good ,n=*.-2/6 pected remo$al e5ciency of minimum si%e particles G2+ ,as per ma>ature of particles = discrete non (oating

peci


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65ciency of remo$al of suspended particles G2+

coe5cient that identi


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for unigranular particles ,!/ = *.*4Darcy weis#ach friction factor ,f/ = *.*8

$= *.*2? m0s

*.***38

M 2.11 )

widedeep

idth of the tan!su#merged ori


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nder of 2.- m length with connected " notches in one side of the launder*.8m

nd of e;uent launder).G4 m

er end of trough is

8.*G m

ss& the critical depth of the launder channel *.8 m of outlet pipe )2* mm

Total inlet (ow for o. of #ed


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r gra$el supportthe sand $aries from *.- to *.4 mm

,D3*0D)*/ $aries from ).1 to -.2of sand is !ept


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for 4 months 8*G*.*1 !g

Total re'uirement in a year 3142.-1 !g3.12 ton

wastage in handling 2 + Total alum re'uired in a year G.)? ton0year

Hence& :lumfor 8 months storage ).G?G ton 0 8 moHeight of stac! maintained - m

pace re'uired for accommodate alum 3m 8m 8mOne weighing machine shall #e pro$ided -** !g capacit

tion Tank%operation hours -4 hrs in a da

onsidering a imum dose 1 mg0lDaily re'uirement of :lum -4.?3 !g"olume of :lum olution Tan! *.2* cum ,2+ strength #y weight/:dded $olume of sludge of :lum ,)*+/ *.22 cumDepth of tan! ) msi%e of tan! *.G4 mPro"ide 2 no% tank% o& 'ize 1 1m 4 1 1m 4 1m

Platform width #etween each tan! *.G2 mfor handling the chemicals and preparing the solutionHeight of the railing in the platform *.G2 mEength of platform 8.G8 mwidth of platform -.4? m

Pro$ide one 6le$ated R platforms 4.-3 m -.G3 mPro$ide one 6le$ated R platforms


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*.*83 cumec

r

,from 3G Eit0sec/

:s per manualM)m,as per manual pg -*1/

m0sec

,as per manual ).2 distance #tw #a;es/

all of width


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nual not less than G*+& page

nual& page no.)-G -8*/

m0sec

M)

f the tan! K - L theg

tween each

o theoretical surface


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nual 87) to 27)& page no. --3/

)) m8) m

,#etween 8 4 hrs as per man

-.8m

ected remo$al


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- m0s O.I.

s'm area

r 0 day 0m, PH66O& pg --1/

ow in the #asin shouldow.

iformly across thetructure. 9t consists of


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, PH66O& pg -83/, PH66O& pg -83/, PH66O& pg -8G/

,)- units/

ntral drain

system

)1

2

y


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t

.I. arg& page no.418

uniform


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thsmanual& page -**

y

WTP Design 3.12 MLD

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