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(B) In the secondary treatment of sewage,the primary effluent is passed into large aeration tanks. Mechanical agitation allows for the constant pumpin

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Aerobic bacteria

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(B) In the secondary treatment of sewage,the primary effluent is passed into large aeration tanks. Mechanical agitation allows for the constant pumping of air into this effluent. This vigorous aeration promotes the rapid growth of aerobic microbes into flocs (masses of bacteria associated with fungal filaments). These aerobic bacteria consume the major part of the organic matter in the effluent,thereby significantly reducing the Biological Oxygen Demand $(BOD)$.

Which organisms grow when air is passed through primary effluent using mechanical agitation?

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