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Objective Question & Answer

QUESTION

Objective Question

Q.1

A water treatment plant has a flow rate of 0.6 m³/s. The settling basin at the plant has effective settling volume dimensions

of length 20 m, depth 3 m and width 6 m. What percentage of the particles having  settling velocity of 0.004 m/sec is

removed?

A
75%
B
80%
C
100%
D
92%
Answer ( Option B)

80%

Solution

          

Surface overflow rate

                                           = 5 × 10–3 m/sec

Settling velocity of particle (Vs) = 0.004 m / sec

                                      % removal = 

                                       = 80%

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