CBSE Class 12-science Answered

Most of the sewage water from urban as well as rural areas was discharged directly into the rivers resulting in their pollution. In order to protect the major rivers in India from sewage pollution, the Ministry of Environment and Forests has initiated development of sewage treatment plants under the National River Conservation Authority, e.g. Ganga Action Plan, Yamuna Action Plan etc. Under these plans, a large number of sewage treatment plants were built so that only treated sewage is discharged in the rivers. Importance of microbial treatment of sewage was then realized and more sewage treatment plants were established.