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Q.

Which of the following is used in secondary treatment of sewage water?

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a

Detoxification tanks

b

Digester tanks

c

Fermentation tanks

d

Aeration tanks

answer is C.

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Detailed Solution

Aeration tanks used in secondary treatment of sewage water. The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs.

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