Multiple choice

Secondary sludge uses

  1. gravitational sedimentation

  2. primary clarifier

  3. non-biodegradable materials

  4. micro-organism to consume waste organic matter
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Secondary sludge, or activated sludge, consists of a mass of bacteria and other microorganisms that consume the organic waste present in the sewage during the secondary treatment stage.

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