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GATE-Civil-Engg-2018-->View question

A rapid sand filter comprising a number of filter beds is required to produce 99 MLD of potable water. (GATE Civil engg 2018)

A rapid sand filter comprising a number of filter beds is required to produce 99 MLD of
potable water. Consider water loss during backwashing as 5%, rate of filtration as 6.0 m/h
and length to width ratio of filter bed as 1.35. The width of each filter bed is to be kept
equal to 5.2 m. One additional filter bed is to be provided to take care of break-down,
repair and maintenance. The total number of filter beds required will be
(A) 19 (B) 20 (C) 21 (D) 22


Asked On2019-06-05 01:14:30 by:gokilapriya

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Ans. (C) 
Sol. 
Given :
 Flow rate = 99 MLD 
 Rate of filtration = 6 m/h. 
 Total water to be filtered   99 
1.05MLD 103.95 MLD [Addition of 5% to be used for backwashing] 
L = 7.02 m 
Surface area of each filter = 36.504 m2
Total surface area required 3 Discharge through filter / Rateof filtration =  721.875m3
Total no. of filter beds required = 19.77 filters = 20 filters
1 unit is to be added as standby, thus total no. of units(filter beds) required = 21 

Answerd on:2019-06-07 Answerd By:Jaynil-Gaglani

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