Effluent is generally considered to be water pollution The sources of wastewater may vary from municipal and sewage to industrial and agricultural. Wastewater is any water that is affected in quality by human impact on the environment. 

 Sewage is one of the biggest sources of wastewater. Sewage water is contaminated with human waste and makes its way through the pipes, pumps and screens which doesn’t contribute positively to the water quality. Additional sources of wastewater can be wash water that is a result of washing dishes, cars, or clothes. Urban rainfall is considered wastewater as well since it contains oils, rubber and gasoline washed from the streets and building roofs. 

 A large source of wastewater is produced in numerous industrial applications such as metal finishing and plating, chemicals production, mining, refining, pulp and paper manufacturing, oil and gas production and many others.

The image of the Electro Oxidation is Self Explanatory