The secondary treatment of sewage waste is also known as _________.

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chemical treatment

physical treatment

biological treatment

detoxification

answer is C.

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Detailed Solution

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. This significantly reduces the BOD (biochemical oxygen demand) of the effluent. involvement of microbes in the secondary treatment can be called as biological treatment.

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