Multiple choice

Activated sludge has the ability to settle quickly this enables it to

  1. be rapidly pumped back from sedimentation to aeration tank.

  2. absorb pathogenic bacteria while sinking to the bottom of the settling-tank

  3. anaerobically digested and be discarded.

  4. absorb colloidal organic matter.
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A Correct answer
Explanation

Activated sludge consists of a mass of bacteria and fungi that settle quickly. This allows a portion of it to be recycled back into the aeration tank as an inoculum for further treatment.

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