In which of the following are flocs formed?

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(B) Flocs are masses of bacteria associated with fungal filaments to form mesh-like structures.These flocs are formed in the $Aeration 	ext{ } tank$

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Aeration tank

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(B) Flocs are masses of bacteria associated with fungal filaments to form mesh-like structures.These flocs are formed in the $Aeration 	ext{ } tank$ during the secondary treatment of sewage.In the $Aeration 	ext{ } tank$, the effluent is constantly agitated mechanically and air is pumped into it, which allows vigorous growth of aerobic microbes into flocs.These microbes consume the major part of the organic matter in the effluent, thereby reducing the $BOD$ (Biochemical Oxygen Demand).

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