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Activated sludge should have the ability...

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

A

be rapidly pumped back from sedimentation tank to aeration tank

B

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

C

be discarded and anaerobically digested

D

absorb colloidal oraganic matter

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The correct Answer is:
A
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