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The purpose of biological treatment of w...

The purpose of biological treatment of waste water is to ________ .

A

reduce BOD

B

increase BOD

C

reduce sedimentation

D

increase sedimentation

Text Solution

Verified by Experts

The correct Answer is:
A
Secondary treatment of sewage (or biological treatment) deplets `90- 95%` of the `BOD` and may pathogens are removed. Reduction of `BOD` by `90%` is achieved through mineralisation of small fraction of organic matter and convertion of large proportion to removable solids.
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