How is BOD reduced in sewage treatment? | vedclass

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(B) During secondary treatment,the sewage is constantly agitated and air is forced into it. This promotes the rapid growth of aerobic microbes into fl

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By constant agitation and forced aeration to promote the growth of aerobic microbes.

Vedclass · Answer

(B) During secondary treatment,the sewage is constantly agitated and air is forced into it. This promotes the rapid growth of aerobic microbes into flocs (masses of bacteria associated with fungal filaments). During their growth,these microbes consume the major part of the organic matter in the effluent. This significantly reduces the $BOD$ (Biochemical Oxygen Demand) of the effluent.

How is $BOD$ reduced in sewage treatment?

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