What is Waste water treatment ? Waste Water Treatment describes the processes used to make water more acceptable for a desired end-use. Waste Water Treatment can include water, for use in industrial processes or to allow discharge into the environment without adverse ecological impact. Waste Water Treatment processes may be physical, chemical or biological, slow sand filtration or activated sludge. Waste Water Treatment include bacteria, algae, viruses, fungi, and man-made chemical pollutants. Substances that are removed during the process. Reference :Wikipedia, the free encyclopedia