Category I pollutants

Garbage must be classified, and the first type of pollutant is the most serious. It often requires special treatment, otherwise it will cause harm to the body. Generally, this kind of pollutant is discharged into nature, thus causing impact on people's health. Wastewater must be discharged to a designated location and must not be discharged directly into rivers. Not only is it harmful to the fish and shrimp inside, it can also easily cause algae to grow rampantly.

The first category of pollutants are all seriously harmful substances that can easily cause great damage to the environment, so they must be strictly controlled.

Wastewater containing such harmful pollutants shall be sampled at the outlet of the workshop or workshop treatment facility, regardless of the industry and wastewater discharge method, or the functional category of the receiving water body, and its maximum allowable emission concentration must comply with the provisions of "Maximum allowable emission concentration of first category pollutants" listed in this standard. No new sewage outlets shall be built in the first-level protection areas of urban centralized drinking water sources, key scenic spots and historic water bodies designated by the state, precious fish protection areas and other water protection areas with special economic and cultural values, as well as bathing beaches and aquaculture farms. Existing sewage discharge units shall be strictly controlled by local environmental protection departments to ensure that the water quality of the receiving waters meets the water quality standards for the specified purposes.

Category I pollutants refer to those that can accumulate in the environment or in animals and plants and have long-term adverse effects on human health . Wastewater containing such harmful pollutants shall be sampled at the outlet of the workshop or workshop treatment facility, regardless of the industry and wastewater discharge method, or the functional category of the receiving water body, and its maximum allowable emission concentration must comply with the provisions of "Maximum allowable emission concentration of first category pollutants" listed in this standard.

Category II pollutants refer to pollutants whose long-term impact is less than that of Category I pollutants . When samples are taken at the discharge outlet of the pollutant discharge unit, their maximum allowable emission concentration must comply with the provisions of "Maximum allowable emission concentration of Category II pollutants" listed in this standard.

This standard stipulates that sewage discharged into surface waters and urban sewers shall be implemented according to the first, second and third level standards respectively according to the functional requirements of surface water areas and the destination of wastewater discharge.