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Question
In a water treatment, the optimum time of flocculation is usually given as 30 minutes. In case the time of flocculation is increased beyond this value, then the flocs will
A.
become heavy and settle down in flocculation itself
B.
entrap air and will float in the sedimentation tank
C.
break up and defeat the purpose of flocculation
D.
stick to the paddles
Answer ( Option B)

entrap air and will float in the sedimentation tank

Solution

Excessive time of flocculation than its optimum time of 30 minutes leads to entrapment of air and floc will float in sedimentation tank.

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