In sewage treatment,after the BOD is reduced | vedclass

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

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Settling tank

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(B) In the process of 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 aerobic microbes into flocs. These microbes consume the major part of the organic matter in the effluent,which significantly reduces the $BOD$ (Biochemical Oxygen Demand). Once the $BOD$ of sewage or waste water is reduced significantly,the effluent is then passed into a settling tank where the bacterial 'flocs' are allowed to sediment. This sediment is called activated sludge.

In sewage treatment,after the $BOD$ is reduced to the required level,the effluent is passed into which of the following?

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