With the increasing population as well as all round development in the country,the competing demand for water for irrigation, domestic use and power generation sectors are exerting enormous pressure on our water resources as utilization of water has also been consequently increasing at a fast pace
Treatment of sewage is essential to ensure that the receiving water into which the effluent is ultimately discharged is not significantly polluted. However, the degree of treatment required will vary according to the type of receiving water. Thus, a very high degree of treatment will be required if the effluent discharges to a fishery or upstream of an abstraction point for water supply. A lower level of treatment may be acceptable for discharges to coastal waters where there is rapid dilution and dispersion.