With the development of China's social economy and the improvement of people's living standards, the consumption of water resources is increasing day by day, and the problem of sewage discharge is becoming increasingly serious. As an important part of environmental protection, sewage treatment plays a vital role in ensuring water health and maintaining ecological environment balance. To this end, the state has formulated a series of strict sewage treatment standards and environmental protection norms, aiming at reducing pollutant emissions and promoting the recycling of water resources through scientific and reasonable management measures and technical means.

First, the basic principles of sewage treatment

1. Source control: emphasize the treatment from the source of pollution to reduce the possibility of direct discharge of industrial wastewater and domestic sewage into natural water bodies.

2. Classified treatment: adopt corresponding treatment methods according to the characteristics of different types of sewage. For example, heavy metal wastewater can only be discharged after removing harmful substances through special processes.

3. Comprehensive utilization: The reclaimed water with treated water quality reaching a certain standard is encouraged to be used in agricultural irrigation, urban greening and other fields to maximize the utilization of resources.

4. Continuous monitoring: establish a perfect online monitoring system, and regularly test the effluent quality to ensure that it meets the requirements of national standards.

Second, the main technical path

-Physical methods: including precipitation, filtration, air flotation, etc., which are mainly used to remove suspended solids and grease impurities;

-Chemical method: using chemical reagent reaction to eliminate specific pollutants, such as using coagulant to aggregate and settle tiny particles;

-Biological method: decomposing organic matter by the metabolic process of microorganisms is one of the most commonly used and effective methods at present;

-Advanced oxidation technology: It can efficiently degrade refractory organic matter by combining various principles such as photocatalysis and electrochemistry.

Third, the support of laws and regulations

In order to strengthen the legal level of sewage treatment, People's Republic of China (PRC) Water Pollution Prevention Law clearly stipulates the responsibilities of governments at all levels and their relevant departments in water environment management, and sets severe penalties for illegal sewage discharge. In addition, the Regulations on Urban Drainage and Sewage Treatment further details the specific requirements for the construction and operation management of urban sewage treatment facilities.

In short, establishing a sound sewage treatment system is not only related to people's quality of life and physical health, but also the key to promoting the construction of ecological civilization and achieving the goal of sustainable development. future, with the progress of science and technology and the joint efforts of all walks of life, we have reason to believe that the sewage treatment industry in China will have a brighter future.