Wastewater is the combination of the liquid or water carried wastes removed from residences, institutions, and commercial and industrial establishments, together with such groundwater, surface water, and storm water as may be present.

The ultimate goal of the wastewater management is the protection of the environment in a manner commensurate with economic, social and political concerns. If untreated wastewater is allowed to accumulate, the Decomposition of the organic material’s it contains can lead to the production of large quantities of malodorous gasses.  Untreated water usually contains numerous Pathogenic-or disease-causing microorganisms that dwell in the human intestinal tract or that may be Present in certain industrial wastes.

It contains nutrient’s which cab stimulate the growth of aquatic plants, and it may contain toxic compound. The major contaminants commonly found in a raw medium strength domestic wastewater, Some of the pathogenic infectious, microorganisms usually found in this type of waste water.