Question

A small filter of 0.05m depth removes 90%of particles present in warter. If the particles removal required is 99%, what should be the depth of filter?

Answer 1

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Answer 2

Answer:

0.1m

Explanation:

two beds are in series. so over all efficiency is given by

(1-n) = (1-n1)(1-n2)

given n=0.99, n1= 0.9

=>n2= 0.9

we know for 90% efficiency 0.05m depth is required.

so total depth = 0.05+0.05 = 0.1m