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Objective Question & Answer

QUESTION

Objective Question

Q.1

A rapid sand filter for a town with water requirement of 1 MLD is to be provided with rate of filtration at 4000 //hr/m² with backwash system.

What would be the size of the filter and its underdrainage system to the nearest approximation?

A
10 and 0.032 sq.m
B
11 and 0.022 sq.m
C
12 and 0.045 sq.m
D
15 and 0.062 sq.m
Answer ( Option B)

11 and 0.022 sq.m

Solution

Q = 1 MLD = 1 × 106 l / d

Rate of filtration = 4000 l/hr/m²

Size of filter =


=10.42 m2 =11 m2

Size of underdrainage system = 0.2% of size of filter = 0.022 m²

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