The total number of filter beds required will be GATE CIVIL Engg 2018

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## The total number of filter beds required will be (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 by:naikaumprakash

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Answers
Flow rate = 99 MLD
Rate of filteration = 6 m/h
Water lost in backwashing=5%
Total water to be produced per day=99*1000 m3
Hence, water to be filtered per day =99*1000/0.95
=104210.526
water to be filtered per hour= 104210.526/24
=723.684 m2
L:B=1.35 and B=5.2m
Surface area of one filter bed = 1.35 B2
=1.35*(5.2)2
=36.504m2
No of filter bed required - 723.684/30.504+1
=20.825
=21(approx)

Answerd By:gokilapriya

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