问题描述：
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,人类对水资源的需求以惊人的速度扩大；另一方面,日益严重的水污染蚕食大量可供消费的水资源.
中国水资源人均占有量少,空间分布不平衡.随着中国城市化、工业化的加速,水资源的需求缺口也日益增大.在这样的背景下,污水处理行业成为新兴产业,目前与自来水生产、供水、排水、中水回用行业处于同等重要地位.
近几十年来,污水处理技术无论在理论研究方面还是在应用发面,都取得了一定的进步,新工艺、新技术大量涌现,氧化沟系统和高效低耗的污水处理技术,如各种类型的稳定塘、土体处理系统、湿地系统都取得了长足的进步和应用.这些新工艺、新技术已成为水污染防治领域的热门研究课题.
本此设计主要通过研究、对比各种不同的污水处理工艺,针对污水水质,气候,环境等条件选取氧化沟工艺来处理生活污水,尽可能创新改进使污水处理达到处理成本最低,处理效果最好的目标.
关键词：生活污水；氧化沟；活性污泥；成本
问题解答：
我来补答
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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