The purpose of biological treatment of waste-water is to
Reduce BOD
Increase BOD
Reduce sedimentation
Increase sedimentation
A
Increase BOD
B
Reduce BOD
C
Reduce sedimentation
D
Increase sedimentation
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Solution
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Decomposition of organic matter by microbes require oxygen. The degree of impurity of water due to organic matter is measured in terms of Biological Oxygen Demand (BOD). BOD is the oxygen required by microorganisms to metabolise organic wastes in the water. Biological treatment of wastewater will reduce the organic impurities or an organic load of polluted water, thus curtail the level of BOD.
So, the correct answer is option A.
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