Activated sludge is the

1.	Activated sludge is the
A.	resultant sludge removable from the aeration unit
B.	sludge settled in the humus tank
C.	sludge in the secondary tank post-aeration rich in microbial mass
D.	sludge.in the secondary tank post aeration, rich in nutrients.
Answer» D. sludge.in the secondary tank post aeration, rich in nutrients.

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