A small part of the activated sludge is pumpe | vedclass

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(B) In sewage treatment,the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into i

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Aeration tank

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(B) In sewage treatment,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. After this,the mixture is passed into a settling tank where the bacterial flocs are allowed to sediment. This sediment is called activated sludge. $A$ small part of this activated sludge is pumped back into the aeration tank to serve as the inoculum.

$A$ small part of the activated sludge is pumped back into which tank?

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