NEET Biology question

During secondary treatment of sewage, once the BOD is reduced significantly, the effluent is passed into a settling tank where

(A)bacterial "flocs" (masses of bacteria associated with fungal filaments) are allowed to sediment, forming activated sludgeCorrect
(B)all water evaporates instantly
(C)chlorine gas is bubbled through the tank
(D)the effluent is converted entirely into biogas

Answer: (A)

Solution

After biological oxidation, bacterial flocs (comprising masses of bacteria entangled with fungal filaments) sediment out

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Question ID VK-124712