Question

Assertion (A): Biological treatment of sewage is called bioaugmentation.
Reason (R): Microorganisms cannot break down sewage.

Answer 1

Secondary treatment removes the dissolved organic matter by the use of biological agents and hence, known as biological treatment. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction. This helps to reduce the BOD of the sewage water.

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