Before 2019 the construction of rural small centralized sewage treatment projects and water quality standards, the main reference is the urban sewage treatment plant standards (GB 18918-2002?), last year, many provinces are dealing with local standards, not copying the urban sewage plant standards. The new regulations are based on the province's "rural sewage treatment facilities, water pollution discharge standards", the core control of pollutants including, COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus, mainly for the daily capacity of 500 tons of the project, some of the Nongjiale and food and beverage projects on the fats and oils also have requirements.

Specifically, you can go online to check the relevant water quality standards, as if in the LiDing environmental protection website all the provincial water standards are also available to download, you can go to understand.

Specifically, you can check the relevant water quality standards on the Internet.