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  • Microbes in Human Welfare Online Quiz
  • When the 'flocs' sediment during secondary treatment they...
Multiple choice

When the 'flocs' sediment during secondary treatment they are called

  1. Primary sludge

  2. Secondary sludge

  3. Deactivated sludge

  4. Activated sludge

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In sewage treatment, the bacterial flocs that settle at the bottom of the settling tank are referred to as activated sludge.

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