Expanded reading: sewage treatment plant refers to the sewage (wastewater) discharged from the source of pollution, due to the total amount of pollutants contained in the pollutant or the concentration of high, unable to meet the requirements of the discharge standards or do not adapt to the environmental capacity requirements, thereby reducing the quality of the water environment and the function of the target, it is necessary to go through artificial intensive treatment of the place, this place is the sewage treatment plant, also known as the sewage treatment station.