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Q.

After secondary treatment a part of activated sludge is passed back to aeration tank as inoculum while most of the part of activated sludge passed to

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a

Rivers and streams

b

Aeration tank

c

Anaerobic sludge digester

d

Settling tank

answer is A.

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Detailed Solution

After secondary treatment a part of activated sludge is passed back to aeration tank as inoculum while most of the part of activated sludge passed to anaerobic sludge digester.

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After secondary treatment a part of activated sludge is passed back to aeration tank as inoculum while most of the part of activated sludge passed to