I. Basic methods of sewage treatment according to the nature of the treatment method is divided into:
1, physical methods: grid filtration, precipitation, flotation, centrifugal separation, membrane separation method, etc.
2, chemical methods: coagulation, chemical precipitation, neutralization, extraction, oxidation reduction, electrolysis, etc.
3, biological methods: aerobic, anaerobic method
II, Sewage can be divided into different degrees of treatment and treatment tasks:
1, primary treatment: mechanical treatment
2, secondary treatment: the main process of biochemical treatment
3, tertiary treatment: control of eutrophication and reuse
Legal basis: "Regulations on Urban Drainage and Wastewater Disposal" Article 5 of the State Council, the competent department of housing and urban-rural construction department to guide and supervise the The national urban drainage and sewage treatment work.
The competent department for urban drainage and sewage treatment of the local people's governments at or above the county level (hereinafter referred to as the competent department for urban drainage) is responsible for the supervision and management of urban drainage and sewage treatment in the administrative area.
Other relevant departments of the people's governments at or above the county level in accordance with the provisions of these regulations and other relevant laws and regulations, in their respective areas of responsibility for the supervision and management of urban drainage and sewage treatment work.