What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.

Explanation

Sewage contains human and animal excreta, food residues, detergents and other organic wastes. It is always rich in bacteria and other biological pollutants. Discharge of sewage into a river, raise the BOD, leading to the killing of fishes and other aquatic life. Water polluted with sewage also become a potent source of many water borne diseases.