Requirements and classification of domestic sewage testing

Domestic sewage testing requirements: control water pollution, protect rivers, lakes, canals, canals, reservoirs and oceans and other surface water and groundwater in good condition, ensure human health, maintain ecological balance, and promote the development of the national economy and urban and rural construction. The state implements 'Environmental Protection Law of the People's Republic of China', 'Water Pollution Prevention and Control Law of the People's Republic of China', 'Marine Environmental Protection Law of the People's Republic of China' and 'Comprehensive Wastewater Discharge Standards' and other regulations and standards. Domestic sewage contains a large amount of organic matter; it also often contains pathogenic bacteria, viruses and parasite eggs; inorganic salts mainly include chloride, sulfate, phosphate, bicarbonate and sodium, potassium, calcium, magnesium, etc. Domestic sewage is generally characterized by high nitrogen and phosphorus content. Domestic sewage comes from residential, office buildings, institutions or similar sewage; sanitary sewage; sewer sewage, including industrial wastewater mixed with domestic sewage in the sewer system. With the improvement of people's living standards, domestic sewage discharge is becoming more and more serious. It has an increasing impact on our lives. Therefore, domestic sewage must be treated or discharged to a certain standard after being treated by a municipal sewage plant. Classification of domestic sewage: According to the environmental function and protection objectives of urban sewage treatment plants discharged into surface waters, as well as the treatment process of sewage treatment plants, the standards of conventional pollutants for basic control items are divided into primary standards, secondary standards, and tertiary standards. The primary standard is divided into A standard and B standard. Class I raw metal pollution and selection control items are not graded. a. Standard A of the first-class standard is the basic requirement for the effluent of urban sewage treatment plants to be used as reused water. When the effluent of the sewage treatment plant is introduced into rivers and lakes with a small dilution capacity for urban landscape water and general reuse water, the A standard of the first-class standard shall be implemented. b. When the effluent of urban sewage treatment plants is discharged into the second-class functional waters of GB3838 surface water (except for the designated drinking water source protection area and swimming area), the second-class functional waters of GB3097 seawater, and closed or semi-closed waters such as lakes and reservoirs, the implementation Class B standard of the first class standard. c. The effluent of urban sewage treatment plants is discharged into the functional waters of GB3838 surface water IV and V or GB3097 sea water of third and fourth functional waters, and the secondary standard shall be implemented. d. For the sewage treatment plants of non-key controlled river basins and non-water source protected areas, the sewage treatment plants of the towns that use the first-level enhanced treatment process shall implement the third-level standard according to the local economic conditions and water pollution control requirements, but the second-level treatment must be reserved The location of the facilities, staged to meet the secondary standard.