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Activated sludge should have the ability to settle quickly, so that it can

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be rapidly pumped back from sedimentation tank to aeration tank

absorb pathogenic bacteria present in waste water, while sinking to the bottom of the settling tank

be discarded and anaerobically digested

absorb colloidal organic matter

answer is A.

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Detailed Solution

Activated sludge should have the ability to settle quickly, so that it can be readily pumped back from sedimentation tank to aeration tank because a small part of the activated sludge is used as inoculum in the aeration tank.

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