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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare2 Marks
Question
During the secondary treatment of the primary effluent, how does the significant decrease in BOD occur?
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Answer

During the secondary treatment of the primary affluent (Primary effluents are passed into a large aeration tank, where it is constantly agitated, and air is pumped into it) vigorous growth of useful aerobic microbes, into flocs takes place, these microbes use major part of the organic matter, and this reduces BOD.

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