Where is the major part of sludge pumped in secondary treatment?(a) Aeration tank(b) Anaerobic sludge digesters(c) Rivers(d) DrainsThis question was addressed to me during an internship interview.My enquiry is from Microbes in Sewage Treatment topic in section Microbes in Human Welfare of Biology – Class 12

Where is the major part of sludge pumped in secondary treatment?(a) Ae

1.	Where is the major part of sludge pumped in secondary treatment?(a) Aeration tank(b) Anaerobic sludge digesters(c) Rivers(d) DrainsThis question was addressed to me during an internship interview.My enquiry is from Microbes in Sewage Treatment topic in section Microbes in Human Welfare of Biology – Class 12
Answer» Correct OPTION is (b) ANAEROBIC SLUDGE digesters To explain I WOULD say: In the secondary treatment, a small part of the activated sludge is pumped back into the aeration tank to serve as inoculum. The remaining major part of the sludge is pumped into large anaerobic sludge digesters.

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