Sewage Treatment Plant (STP) Sewage treatment is the process of removing contaminants from domestic and municipal wastewater, containing mainly household sewage plus some industrial wastewater. The waste water from residential/commercial complexes are unstable poly dispense system. These can have coarse and fine particles along with high COD and BOD. Sewage treatment (STP Plant) refers to the process of removing contaminants, micro-organisms & other type of pollutants from household sewage. Sewage waste is generated in high amount which is polluting many water bodies. Our latest technology based STP system not only purify liquid waste but also produce chemical free sludge which can be used as manure in horticulture. The main purpose of a sewage treatment system is to remove waste water from points of origin to a treatment facility or place of disposal. When you look to set up a sewage water treatment plant so I think you need to know that a sewage water treatment plant is performed physically as well as biological process and sometimes it also performs chemical processes to remove pollutants from water.