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Which of the following is the cause of rising sludge?

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in Environmental Engineering by (81.4k points)
Which of the following is the cause of rising sludge?

(a) Sedimentation

(b) Denitrification

(c) Chlorination

(d) Flocculation

I have been asked this question during an interview.

My question comes from High Rate Trickling Filter and Secondary Clarifier in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

1 Answer

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Best answer
Correct answer is (b) Denitrification

To explain: When nitrogen is formed in the sludge, the rise of the sludge mass takes place. These phenomena is called as rising sludge.

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