alleryThe sediment settling after secondary treatment is called activated:
ASludge
BCarbon
CFilter
DEffluent
Answer & Solution
Correct answer: A. Sludge
1. The flocs are allowed to settle in a tank.
2. Some of the sediment is pumped back to the aeration tank.
3. That sediment is called activated sludge.
_Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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