Civil Engineering - UPSC Civil Service Exam Questions - Discussion

40. 

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: Option C

Explanation:

No answer description available for this question.

Rishabh Katiyar said: (Mar 2, 2019)  
Activated sludge is a thick soft substance used for removing pollutants from waste water by a biological reaction that involves oxygen. The activated sludge is then separated from the treated wastewater and disposed of or returned to the process as needed.

Yempee said: (Sep 29, 2019)  
Thank you @Rishabh.

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