During the secondary treatment of the primary effluent how does the significant decrease in BOD occurs?

During the secondary treatment of the primary effluent how does the si

1.	During the secondary treatment of the primary effluent how does the significant decrease in BOD occurs?
Answer» Secondary treatment includes aeration of primary effluent and biological treatment involving microbial treatment. The aerobic microbes grow and oxidize the organic matter. The major part of organic matter is consumed by the microbes so that the BOD of sewage is decreased.

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During the secondary treatment of the primary effluent how does the significant decrease in BOD occurs?

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