Environment Studies (Science) (M.Phil./Ph.D.) 2016 Panjab University Entrance Exam With Answers

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44.

Activated sludge is the:

A: Aerated sludge in the aeration unit
B: Sludge settled in the humus tank
C: Sludge in the secondary tank after aeration and rich in microbial mass
D: Sludge in the secondary tank after aeration and rich in nutrients

The answer is: C

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