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In which secondary treatment of sewage treatment sludge is broken down in an anaerobic digester?

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In which secondary treatment of sewage treatment sludge is broken down in an anaerobic digester?

(a) Oxidation pool

(b) Activated sludge process

(c) Trickling filter

(d) Bed filter

I have been asked this question in class test.

Enquiry is from Effects and Control Measures of Marine Pollution topic in section Environmental Pollution of Energy Management

1 Answer

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Right answer is (b) Activated sludge process

The explanation: In sedimentation tank, during sludge treatment sludge is broken down in an anaerobic digester. The digester sludge is pumped onto sludge drying beds. The dried sludge is a good source of manure.

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