Secondary sewage treatment is mainly a

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(C) Secondary sewage treatment is primarily a biological process. In this stage,the primary effluent is passed into large aeration tanks where it is c

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Biological process

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(C) Secondary sewage treatment is primarily a biological process. In this stage,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 (masses of bacteria associated with fungal filaments to form mesh-like structures). While growing,these microbes consume the major part of the organic matter in the effluent,significantly reducing the Biochemical Oxygen Demand $(BOD)$ of the sewage.

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