Based on the source and nature of pollutants, pollutant control programs are divided into two categories of basic control programs and selective control programs. Basic control items mainly include conventional pollutants that can be removed by general treatment processes affecting the water environment and urban wastewater treatment plants, as well as some of the class I pollutants, ****19 items. Selection of control items include pollutants that have a longer-term impact on the environment or are more toxic, *** counting 43 items.
Standard grading: according to the urban sewage treatment plant discharged into the surface waters of the environmental functions and protection objectives, as well as sewage treatment plant treatment process, the standard value of conventional pollutants of the basic control items are divided into first-class standards, second-class standards, third-class standards. The primary standard is divided into A standard and B standard. A class of heavy metal pollutants and selective control projects are not graded.
1. A standard A standard is the basic requirements of urban sewage treatment plant effluent as water reuse. When the sewage treatment plant effluent into the dilution capacity of small rivers and lakes as urban landscape water and general reuse of water and other purposes, the implementation of the first level of standard A standards; urban sewage treatment plant effluent discharged into the national and provincial key watersheds and lakes, reservoirs and other closed, semi-enclosed waters, the implementation of the first level of standard A standards.
2. B standards for primary standards: discharged into GB 3838 surface water Class III functional waters (except for the delineation of the drinking water source protection zones and swimming areas), GB 3097 seawater Class II functional waters, the implementation of a standard B standards;
3. Secondary standards: urban sewage treatment plant effluent discharged into the GB 3838 surface water Ⅳ, Ⅴ functional waters or GB 3097 seawater Class III, IV functional waters. 3097 seawater three, four types of functional waters, the implementation of secondary standards.
4. tertiary standards: non-focus on controlling the watershed and non-water protection area of the town of sewage treatment plant, according to local economic conditions and water pollution control requirements, the use of primary enhanced treatment process, the implementation of tertiary standards. However, the location of secondary treatment facilities must be reserved to achieve secondary standards in stages.
Legal basis
Article 42 of the Environmental Protection Law
Enterprises, institutions and other production operators that discharge pollutants shall take measures to prevent and control waste gas, waste water, waste residue, medical waste, dust, foul-smelling gases, radioactive substances, as well as noise, vibration, optical radiation, electromagnetic radiation and other activities generated in production and construction or other activities on environmental Pollution and hazards. Enterprises and institutions discharging pollutants shall establish a responsibility system for environmental protection and clarify the responsibilities of unit heads and relevant personnel. Key emission units shall install and use monitoring equipment in accordance with relevant state regulations and monitoring specifications, ensure the normal operation of monitoring equipment, and keep original monitoring records. It is strictly prohibited to discharge pollutants illegally through concealed pipes, seepage wells, seepage pits, irrigation or tampering, falsification of monitoring data, or improper operation of pollution prevention and control facilities to avoid supervision.