Question

explain the process of sewage water treatment before it can be discharged into natural bodies. why this treatment is essential? explain in brief ​

Answer 1

Answer:

Thus aerobic microbes grow vigorously consuming a major part of the organic effluent reducing Biological Oxygen Demand (BOD) of the effluent. The sewage is then passed into the settling tank where bacteria settle and now it is known as activated sludge. ... This effluent can then be released into natural water bodies.