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The detention period of the Sheffield mechanical aeration tank is ___________

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The detention period of the Sheffield mechanical aeration tank is ___________

(a) 15 hours

(b) 1minute

(c) 1 hour

(d) 4 hours

The question was asked during a job interview.

This intriguing question comes from Mechanical Aeration System, Treatment of Sludge topic in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct answer is (a) 15 hours

Explanation: The detention period of a Sheffield mechanical aeration tank is 15 hours. Its return sludge is 15-20% of sewage flow.

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