The incoming water from the sewage treatment plant in Hengshan District, Jixi City meets the discharge standard of Intermediate Level A. According to the query of relevant public information, the environmental functions and protection objectives of urban sewage treatment plants discharged into surface waters, as well as the treatment technology of sewage treatment plants, the standard values ??of conventional pollutants for basic control items are divided into first-level standards, second-level standards, and third-level standards. The first-level standards are divided into A standard and B standard. Some first-class pollutants and selected control items are not classified.