1. The importance of sewage treatment
The harm of sewage to human beings is multifaceted, sewage may contain various pathogens, in the process of urbanization, the discharge of domestic and industrial sewage is increasing, if these sewage is directly discharged into natural water bodies without treatment, it will cause great harm to the environment and human health. Therefore, sewage treatment is of great significance for protecting the environment, ensuring people's health and sustainable development.
Second, the process of sewage treatment
Sewage treatment is divided into: pretreatment, primary treatment, secondary treatment and ** treatment, the sewage first passes through the coarse grid to intercept large floating and suspended solids, and then enters the grit tank to remove heavy metals and other particles. Physical treatment method: mainly uses physical action to separate non-soluble substances in sewage, and commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation, etc. The physical treatment structure is relatively simple and economical, and is used in the case of large water capacity, strong self-purification capacity and low sewage treatment degree requirements in villages and towns.
Disinfection: Treated sewage needs to be disinfected to kill pathogenic microorganisms and prevent the spread of disease.
Discharge or reuse: Treated wastewater can be discharged or reused, e.g. for agricultural irrigation, urban landscape, etc.
3. Sewage treatment
technology
Activated sludge method: The activated sludge method is one of the commonly used biological treatment methods to remove pollutants through microbial metabolism in an aeration tank. A2O process: The A2O process is a high-efficiency biological nitrogen and phosphorus removal process, which removes pollutants through the microbial metabolism of anaerobic, anoxic and aerobic.
MBR process: MBR process is a membrane separation technology that separates microorganisms from water through the filtration action of membranes to improve the efficiency of wastewater treatment.
Advanced Oxidation Technology: Advanced Oxidation Technology is an emerging wastewater treatment technology that produces strong oxidants through chemical reactions to convert pollutants such as organic matter and ammonia nitrogen in sewage into harmless substances.
In addition to these, there are some other sewage treatment technologies, such as precision filtration technology, radioactive membrane technology, ultraviolet and reverse osmosis technology, ion exchange technology, etc. Each of these technologies has its own characteristics, and the right combination of technologies can be selected according to different processing needs and scenarios.
The importance of wastewater treatment technology is to reduce the discharge of pollutants, protect water resources, and improve the quality of water bodies. With the improvement of environmental protection awareness and the strengthening of laws and regulations, the application and development of sewage treatment technology will receive more and more attention.
Fourth, the reuse of sewage
The water quality has been significantly improved after the treatment of water, which can be used for agricultural irrigation, urban landscape, industrial cooling, and more. In water-scarce areas, wastewater reuse has become an important way to use water resources. However, in the process of reuse, it is necessary to pay attention to the quality of the effluent, its use and how it is used to avoid adverse effects on the environment and human health.
Wastewater treatment is an important means to protect the environment, protect people's health and promote sustainable development. With the development of science and technology and the improvement of environmental awareness, we need to continuously improve and innovate sewage treatment technology to improve the efficiency and quality of sewage treatment. At the same time, strengthening the reuse of sewage is also one of the important ways to alleviate water shortage.