Question

During the secondary treatment of the primary effluent how does the significant decrease in bod occur?

Answer 1

During the secondary treatment of primary effluents, the BOD level decreases because useful microbes consume a major part of the organic matter. Reduction in the organic matter leads to lowering of BOD.

Answer 2

The BOD decreases after secondary treatment.

Explanation:

The BOD can be defined as the oxygen which is needed by the aerobic organism to break the organic material present in the given sample.

This BOD has to be decreased in the secondary treatment of the primary effluent.

The secondary treatment of the sample is done by introducing microbes which consumes a major part of the oxygen from the sample, resulting in the decreased BOD.

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