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The need for "detoxification" sewage treatment

Author: Source: Time: 2020-01-16 Category: News

Medical institutions such as hospitals are responsible for medical, teaching, scientific research, and prevention. The sources and components of the sewage discharged by these units are very complex. The sewage may contain a large number of toxic and harmful substances such as infectious bacteria, viruses, and chemical agents. Harmful and contagious. If medical sewage does not undergo strict innocuous treatment and enters urban sewers or environmental water bodies, it is likely to cause water pollution and infectious disease outbreaks, which will seriously endanger people's health.

The World Health Organization requires that only when a well-run urban sewage plant is built downstream of the hospital, and the secondary biological treatment system of the sewage plant can effectively remove more than 95% of pathogenic microorganisms; the sludge of the sewage plant is effectively treated by anaerobic biology Later, when the parasite eggs in the sludge are less than 1 per liter, the hospital sewage can be discharged into the municipal sewage pipe only after disinfection. If the above conditions cannot be met, the hospital needs to establish a separate laboratory sewage treatment equipment . The process of hospital sewage treatment includes: primary treatment, secondary biological treatment and disinfection. The sludge produced in the hospital sewage treatment contains a large number of pathogenic bacteria and parasite eggs, which need to be anaerobic digested, and can also be dried and burned with the hospital solid waste.

Although the requirements of the World Health Organization are strict, they have not reached the level of developed countries. Developed countries have very strict management of medical sewage. Not only have they established a health and safety management system in hospitals, but they also have clear regulations for the treatment of hospital sewage under different conditions. In contrast, China's medical wastewater treatment is still at a relatively low level. Although most of the existing hospitals have sewage treatment equipment, the treatment process is basically simple chlorination disinfection. Only a few hospitals have secondary biochemical treatment facilities, and the level of construction and management of hospital sewage treatment facilities varies. Controlling the spread of pathogenic bacteria with sewage and preventing the spread of infectious diseases are extremely disadvantageous.

According to the relevant provisions of the Law on the Prevention and Control of Environmental Pollution by Solid Wastes, the Law on the Prevention and Control of Water Pollution, and the Law on the Prevention and Control of Infectious Diseases, hospital clinical waste generated by hospitals, especially infectious disease hospitals, and medical wastewater containing pathogens must be disinfected Harmful treatment, the discharge of untreated medical waste and waste water is prohibited, and infectious disease hospitals should form an independent sewage treatment system.

According to the characteristics of medical wastewater, the combination of efficient bacterial inactivation technology and immobilized microorganism technology can effectively solve the problems of degradation of organic matter, ammonia nitrogen and inactivation of pathogenic microorganisms in wastewater. Its main principle is to apply advanced immobilization technology to immobilize mutant bacteria and enzyme preparations on the macroporous mesh carrier, so that its biological load is tens of times that of the traditional biological treatment process, which can efficiently degrade the current traditional biological method and consider it impossible Degradation of pollutants. This process has the advantages of good effluent water quality, small footprint, and stable operation. The integrated fully enclosed structure eliminates air pollution caused by aerosol macromolecules carrying pathogenic microorganisms, and the process basically produces no residual sludge, greatly reducing the number of pathogens discharged from the system and avoiding sludge during biological treatment. The problem of secondary pollution.


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