1.

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, the flocs will

A. become heavy and settle down in the flocculation tank 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» C. Break up and defeat the purpose of flocculation


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