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How many stages are there in the sludge digestion process?

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+1 vote
in Environmental Engineering by (81.4k points)
How many stages are there in the sludge digestion process?

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me in a national level competition.

My question comes from Digestion of Sludge, Sludge Digestion Tank topic in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

1 Answer

+2 votes
by (693k points)
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Best answer
Right choice is (b) 3

Explanation: The sludge digestion process consists of acid fermentation, acid regression and alkaline fermentation.

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