What is the hygienic safety distance regulation of sewage treatment plant?

The national standard "Code for Urban Drainage Engineering Planning (GB503 18-2000)" requires that urban sewage treatment plants should keep a certain health and safety protection distance from residential areas and public buildings. Industry practice determines that this health and safety protection distance is 300 meters, that is, about 420 mu of land is directly affected and cannot be reused.

Extended data:

Sewage treatment can be divided into physical method, biological method and chemical method according to its function.

1. Physical method: Insolubles in sewage are mainly separated by physical action, and their chemical properties are not changed during treatment. Commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation and so on. The physical treatment of structures is simple and economical, and it is used in villages and towns with large water volume, strong self-purification ability and low requirements for sewage treatment.

2. Biological method: The organic matter in dissolved or colloidal state in sewage is decomposed and oxidized into stable inorganic matter by using the metabolic function of microorganisms, so that the sewage can be purified. Activated sludge process and biofilm process are commonly used. The treatment degree of biological method is higher than physical method.

3. Chemical method: it is a method to treat or recover dissolved or colloidal substances in sewage through chemical reaction, which is mostly used in industrial wastewater. Coagulation, neutralization, redox and ion exchange are commonly used methods. Chemical treatment has good treatment effect and high cost, and it is mostly used as the effluent after biochemical treatment for further treatment to improve the effluent quality.

Baidu Encyclopedia -GB 503 18-2000 Code for Urban Drainage Engineering Planning

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