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

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

VMMC MedicalVMMC Medical 2013

Solution:

Degree of impurity of water due to organic matter is measured in terms of BOD (Biological Oxygen Demand). Biological treatment of waste-water or sewage treatment is very necessary in order to decompose sewage thereby increasing the dissolved oxygen in water and decreasing the BOD.