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Microbes In Human Welfare

Question

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List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment.

Solution

After the primary treatment, the primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it.This leads to the vigorous growth of useful aerobic microbes (Flocs of bacteria and fungi). The microbes consume a major portion of the organic matter of the effluent and thus reduce the BOD significantly.

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