During which stage of sewage treatment is the | vedclass

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(B) In the biological treatment (secondary treatment) of sewage,the primary effluent is passed into large aeration tanks. In these tanks,the effluent

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Biological treatment

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(B) In the biological treatment (secondary treatment) of sewage,the primary effluent is passed into large aeration tanks. In these tanks,the effluent is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form mesh-like structures). These microbes consume the major part of the organic matter in the effluent,thereby significantly reducing the Biochemical Oxygen Demand $(BOD)$.

During which stage of sewage treatment is the effluent mechanically agitated continuously?

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