Select the correct statement regarding activated sludge formed during secondary sewage…
Biology · Class 12 · CBSE — Microbes in Human Welfare
Select the correct statement regarding activated sludge formed during secondary sewage treatment.
- A small part of it is rapidly pumped back from sedimentation to aeration tank.
- It absorbs pathogenic bacteria present in waste water while sinking to the bottom of the settling tank.
- A major part of it is anaerobically digested.
Both (a) and (c)
Answer
(D) Both (a) and (c)
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