The so-called domestic sewage refers to the sewage generated by people in their daily life, mainly including some kitchen wastewater, washing wastewater, and discharge wastewater. The foul odor in domestic sewage is one of the serious pollution hazards. It not only pollutes the water environment, but also causes troubles to residents' lives

The sewage treated by domestic sewage treatment equipment, whether used for industry, agriculture, or recharge groundwater, must comply with the relevant water quality standards issued by the country. How many treatment methods are there for domestic sewage treatment equipment?

1. Physical treatment method: A wastewater treatment method that separates and recovers insoluble suspended pollutants (including oil films and oil droplets) from wastewater through physical action. It can be divided into gravity separation method, centrifugal separation method, and screen filtration interception method.

2. Chemical treatment method: A wastewater treatment method that separates and removes dissolved and colloidal pollutants from wastewater through chemical reactions and mass transfer, or converts them into harmless substances

3. Biological treatment method: A wastewater treatment method that converts organic pollutants in solution, colloid, and micro suspended states into stable and harmless substances through the metabolic action of microorganisms. According to the different microorganisms involved, biological treatment methods can also be divided into aerobic biological treatment

4. There are two types of anaerobic biological treatment. The aerobic biological treatment method is widely used in wastewater biological treatment. According to tradition, aerobic biological treatment methods are divided into two categories: activated sludge method and biofilm method. The activated sludge method itself is a treatment unit, anaerobic biological treatment method, also known as biological reduction treatment method, mainly used to treat high concentration organic wastewater and sludge. The main treatment equipment used is a digestion tank.

5. Biological contact oxidation method: Wastewater treatment is carried out using the biological contact oxidation process, which involves filling the biological reaction tank with fillers and immersing all the fillers in the oxygenated wastewater.