In a sewage treatment plant, microbial flocs are formed during-

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Primary treatment

Secondary treatment

Filteration of sewage

Tertiary treatment treatment

answer is B.

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Detailed Solution

During secondary 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 (masses of bacteria associated with fungal filaments to form mesh like structures).

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