1. Physical treatment method:

Wastewater treatment methods that separate and recover insoluble pollutants (including oil film and oil beads) in wastewater by physical action can be divided into gravity separation method, centrifugal separation method and sieve filtration interception method. The treatment method based on heat exchange principle also belongs to physical treatment method.

2. Chemical treatment method:

A wastewater treatment method that separates and removes dissolved and colloidal pollutants in wastewater or converts them into harmless substances through chemical reaction and mass transfer.

3. Biological treatment method:

Through the metabolism of microorganisms, organic pollutants in solution, colloid and fine suspension in wastewater are transformed into stable and harmless substances. According to the different microorganisms, biological treatment can be divided into aerobic biological treatment and anaerobic biological treatment.

Extended information

Precautions for sewage treatment:

1. From the point of view of water quality and treatment technology, urban domestic sewage, especially domestic sewage without toilet flushing drainage, has good water quality and high organic matter content.

many uses of water in cities, such as cooling water, washing water, building water and irrigation water, have low requirements on water quality. Sewage utilization technology has been developed, and water treatment technology can fully meet its technical support.

second, from the point of view of water quantity, the amount of urban sewage is almost equal to that of water consumption, and rainwater has the characteristics of seasonality and randomness, which can be used as reclaimed water in cities.

third, from the perspective of engineering construction, the equipment required for the utilization of urban sewage and rainwater is far less than the amount of work required for the use of tap water.

fourth, from the economic point of view, it not only saves pure water resources, but also reduces the cost of sewage discharge and so on, which has obvious economic benefits.

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