Sewage Treatment is the technique of eliminating pollutants from wastewater and household sewage as well as commercial and institutional effluents. The sewage may contain biological, physical and chemical impurities, and for removing such contaminants corresponding treatment is undertaken. The intention of sewage treatment is to release environmentally safe fluid waste stream (or treated effluent) and a solid waste (or treated sludge) ideal for harmless disposal or reuse (generally as fertilizers). With the advent of modern technology, now it is possible to re-use sewage effluent as drinking water.