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The maximum aeration period for a conventional activated sludge system is ___________

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The maximum aeration period for a conventional activated sludge system is ___________

(a) 2 hours

(b) 3 hours

(c) 4 hours

(d) 6 hours

I have been asked this question by my college director while I was bunking the class.

This key question is from Design of Activated Sludge Plant in portion Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
The correct option is (d) 6 hours

Easiest explanation: The detention period for a conventional activated sludge system is between 4 to 6 hours.

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