英语翻译20世纪50年代以后,全球人口急剧增长,工业发展迅速.全球水资源状况迅速恶化,“水危机”日趋严重.一方面,人类对
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Increased sharply since the 1950 s, the world's population, industrial development is rapid. Global water situation to deteriorate rapidly, "water crisis" has become increasingly serious. On the one hand, human demand for water resources expanding at an alarming rate; On the other hand, the increasingly serious water pollution, eating into a large number of water resources available for consumption. China's water resources per capita is less, the space distribution imbalance. With the acceleration of China's urbanization, industrialization, water demand gap is growing. In such a background, the sewage treatment industry become a new industry, at present, and tap water production, water supply, drainage, water reuse industry in the equally important position. In recent decades, sewage treatment technology both in theoretical research and the application of yeast, has made certain progress, the new craft, new technology, oxidation ditch system and high efficient low consumption of sewage treatment technology, such as various types of soil stabilization pond, the processing system, wetland system has made great progress and the application. These new techniques, new technology has become a hot research topic in the field of water pollution prevention and control. This this design mainly through research, compare different kinds of wastewater treatment process, in view of the wastewater quality, climate, environment condition such as selecting oxidation ditch technology to process the sewage, innovation to improve the sewage treatment as soon as possible to deal with lowest cost, best target treatment effect. Key words: sewage; Oxidation ditch. Activated sludge; The cost of

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