1, physical treatment method:
Through the physical action of separation, recovery of wastewater in the insoluble suspended state of the pollutants (including oil film and oil beads) wastewater treatment method, can be divided into gravity separation method, centrifugal separation method and sieve filtration retention method. The treatment method based on the principle of heat exchange also belongs to the physical treatment method.
2, chemical treatment method:
Through chemical reaction and mass transfer to separate, remove the wastewater in the dissolved, colloidal state of the pollutants or convert them into harmless substances in the wastewater treatment method.
3, biological treatment:
Through the metabolism of microorganisms, the wastewater solution, colloid and micro-suspension of organic pollutants, into a stable, harmless substances in the wastewater treatment method. According to the role of different microorganisms, biological treatment method can be divided into aerobic biological treatment and anaerobic biological treatment of two types.
Expanded Information
Note on sewage treatment:
From the point of view of water quality and treatment technology, urban sewage, especially the sewage does not contain toilet flushing drainage water quality is better, and the content of organic matter is higher.
Many uses of water in the city, such as cooling water, flushing water, construction water, irrigation water, etc., do not require high water quality. Sewage utilization technology has been developed and matured, and water treatment technology can fully meet its technical support.
Two, from the water point of view, the amount of urban sewage and water consumption is almost equal, rainwater with seasonal and random characteristics, can be used as urban recycled water.
Three, from the engineering construction point of view, urban sewage and rainwater utilization requires pro-use equipment than the use of tap water is much smaller than the amount of work required.
Four, from the economic point of view, not only saves pure water resources, but also reduces the cost of sewage and other costs, reducing costs, there are significant economic benefits.
Baidu Encyclopedia - Domestic Wastewater Treatment