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_________ is the time at which sewage is detained in the aeration tank.

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_________ is the time at which sewage is detained in the aeration tank.

(a) Average time

(b) Detention time

(c) Aeration period

(d) Reaeration period

The question was asked by my school principal while I was bunking the class.

This intriguing question comes from Design of Activated Sludge Plant in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Right choice is (c) Aeration period

For explanation I would say: Aeration period decides the loading rate at which sewage is introduced in the aeration tank.

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