alleryIn secondary treatment the effluent goes into large tanks that are:
AKept very cold
BBoiled away
CKept aerated
DSealed right off
Answer & Solution
Correct answer: C. Kept aerated
1. Useful aerobic microbes must be encouraged to grow.
2. They need oxygen to do their work.
3. So air is pumped into large aeration tanks.
_Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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