Water
Treatment
We have seen that water and sewage harbour a variety of organisms responsible for diseases in man. It is thus necessary to remove or rather interrupt the disease cycle in nature through treatment of water and sewage. Water purification and sanitary sewage disposal are two major methods for interrupting disease cycle.
In water purification organisms are prevented from reaching the body whereas in sewage disposal, they are removed from body waste products. The various steps in the purification of drinking water in municipal water supplies are, It may be seen that there are three basic steps in the purification of drinking water: sedimentation, filtration and chlorination.
