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Which of the following is obtained in the secondary tank in two stage sludge digester?

(a) Partially digested sludge

(b) Partially digested sludge and supernatant liquor

(c) Digested sludge and supernatant liquor

(d) supernatant liquor

I had been asked this question in a job interview.

I want to ask this question from Digestion of Sludge, Sludge Digestion Tank topic in division Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct answer is (c) Digested sludge and supernatant liquor

The best I can explain: In two stage sludge digester, the partially digested sludge is obtained in primary tank, whereas digested sludge is obtained in the secondary tank along with supernatant liquor.

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