A) be rapidly pumped back from sedimentation to aeration tank.
B) absorb pathogenic bacteria while sinking to the bottom of the settling-tank.
C) anaerobically digested and be discarded.
D) absorb colloidal organic matter.
Correct Answer: A
Solution :
[a] Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation to aeration tank.
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