Abstract: It is completely feasible for industrial sewage to be reused in production after effective treatment to meet the standard of surface water. The recycling of industrial wastewater and domestic sewage is an effective measure to reduce environmental pollution and alleviate water shortage. It is the perfect unity of social benefits, environmental benefits and economic benefits, and it is also an important part of China's sustainable development strategy. Key words: high-purity purification and utilization of sewage treatment 1. With the acceleration of industrialization and modernization, ecological environment protection is facing greater pressure and challenges. At present, 82% of the key river sections of the seven major water systems in China are polluted, 63. 1% of the river sections are classified as IV, V or worse than V, and 92% of the cities are threatened by water pollution. According to statistics, in 2002, the discharge of wastewater and sewage reached 620× 108m3/a, which seriously damaged the river water environment. At the same time, China is short of water resources, and it is one of 13 water-poor countries in the world. The per capita water resource is 65438+ 0/4 of the world average. More than 400 cities in China are short of water, and about 150 cities implement regular and quantitative water supply. However, the water shortage situation is more severe in the northern region, which accounts for 4 1% of the urban population and 35% of the city's total industrial output value. The increasingly serious water pollution makes the situation of water shortage more severe. Water pollution not only reduces the use function of water, but also intensifies the contradiction of water shortage, which has a serious negative impact on the sustainable development strategy being implemented in China, and also seriously threatens the drinking water safety of urban and rural residents and the health of the people. Therefore, the recycling of urban sewage is one of the effective ways to increase revenue and reduce expenditure, reduce water pollution, improve the ecological environment and solve the problem of urban water shortage. The purification and reuse of domestic sewage has been put on the agenda of the government. From the perspective of sustainable utilization of water resources, deep purification of sewage is a better way of sewage reuse. For example, the Pearl River Delta in Guangdong Province has formed a vicious circle of "economic development-water pollution-water quality decline"; More than 30 million people in the Taihu Lake basin are guarding the 2300 square kilometers of Taihu Lake, and no amount of water is easy to use. At present, more than 400 cities in China are short of water, and the water shortage in normal years is 60× 108m3. It is predicted that the water shortage will reach (400~500)× 108m3 in 2030. According to the requirements of the tenth five-year plan, by 2005, the centralized treatment rate of urban sewage in China will reach 45%. If the average reuse rate of sewage after deep purification reaches 20%, the reuse amount of sewage at the end of the tenth five-year plan can reach 40× 108m3/a, which can solve the water shortage problem in more than half of the cities in China. Therefore, the development and application of advanced sewage purification and reuse technology with low investment, quick effect and low operating cost has become a major issue to ensure the sustainable development of social economy. This article is transferred from-/mianfeilunwen/Biyelunwenfree/1398855/index.htm.

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