The process of secondary enhanced treatment of domestic sewage refers to a process that can effectively remove carbon pollutants and has strong phosphorus and nitrogen removal capabilities for the treatment process.

In areas where nitrogen and phosphorus pollutants need to be controlled, sewage treatment plants with a daily processing capacity greater than 100000 cubic meters generally use A/O method, A/A/O method or other methods. Carefully choose equally effective methods.

In addition to the A/A/O method, in sewage treatment facilities with a daily processing capacity of less than 100000 cubic meters, oxidation ditch method, ABR method, and good hydrolysis process can also be used to achieve phosphorus and nitrogen removal. Oxygen measurement and biofilter.

If necessary, physical and chemical methods can also be used to improve the phosphorus removal effect.

Natural purification process for domestic sewage treatment equipment:

1. If strict environmental impact assessment is conducted and relevant standards are met, and the self purification capacity of water is required, domestic sewage treatment methods such as discharge into rivers or deep sea should be used with caution.

2. In areas where conditions permit, existing conditions can be utilized, such as wasteland and idle land, as well as land treatment and natural purification technologies such as stabilization ponds.

If the secondary treatment of domestic sewage cannot meet the water environment requirements, natural purification technologies (such as land treatment systems and stabilization tanks) can be further adopted.

4. When using land treatment technology, strict measures should be taken to prevent groundwater pollution.