Select the correct statement regarding a...

Select the correct statement regarding activated sludge formed during secondary sewage treatment.

A

A small part of it is rapidly pumped back from sedimentation to aeration tank

B

It absorbs pathogenic bacteria present in waste water while sinking to the bottom of the settling tank

C

A major part of it is anaerobically digested

D

Both (a) and (c)

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The correct Answer is:

D

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