Waste water refers to all effluent from household, commercial establishments and institutions, hospitals, industries and so on. It also includes storm water and urban runoff, agricultural, horticultural and aquaculture effluent. Waste water treatment is the process of converting waste water that is no longer needed or is no longer suitable for use into bilge water that can be discharged back into the environment. It’s formed by a number of effluents from Industries, Domestic waste etc.