摘要:氧化沟是一种简易的活性污泥系统，由活性污泥在闭合的曝气渠道中循环流动，通过活性污泥中的微生物对污水中的有机污染物不断地进行降解和去除，达到净化污水的目的。氧化沟由于其出水水质好、运行稳定、管理方便等技术特点，在我国污水处理厂中有着较为广泛的应用。本文首先阐述了城市污水处理的重要性，其次介绍了氧化沟工艺在污水处理中的发展、应用,以及几种典型的氧化沟工艺。最后结合江宁污水厂实际，简要分析了其氧化沟的运行情况。

　　　江宁污水处理厂分三期建设，采用了三种不同的氧化沟工艺。其中一期工程采用奥贝尔氧化沟工艺,二期工程采用A2/O法氧化沟工艺,本文简要对一二期的氧化沟进行了介绍，三期工程日处理污水能力为4万吨，采用双沟氧化沟。

　　　双沟系统，设有独立的二沉池和回流污泥系统，通过两沟内转刷交替处于高速和低速运行，可使两沟交替处于缺氧和好氧状态，氧化沟内只是交替行着硝化和反硝化，是专为生物脱氮而开发的工艺。两个氧化沟相互连通，串联运行，可交替进出水。在氧化沟前设置厌氧段，污泥回流到厌氧段，可实现生物除磷，最终随剩余污泥排除。整个系统去除有机物的同时达到脱氮除磷的效果。

关键词：污水处理；氧化沟；运行

Abstract:The oxidation ditch is one kind of simple active sludge system, by the circulatory flowing of the active sludge in the closed aeration channel, through  the microbes in the active sludge to degradation and remove the  organic pollutant in the sewage unceasingly , to achieves the purification sewage the goal. because of its good water quality,stable operation,, easy management,and other technical features .it has a wide range of applications in the sewage treatment plant in China. This paper frist describes the important of urban sewage treatment . Then introduces the development and application of the oxidation ditch process in sewage treatment,and several typical  oxidation ditch process. Finally, combine with the actual of Jiangning Wastewater treatment plant ,make a brief analysis of the operation of the oxidation ditch.

　　　Jiangning sewage treatment plant built in three phases, using three different kinds of oxidation ditch process. The first phase of the uses Orbal oxidation ditch process, the second phase uses A2/O oxidation ditch process. This paper introduces the them briefly, The processing of sewage of the phase is 4 million tons a day,it adapt DE oxidation ditch process.

　DE oxidation ditch system, with a separate secondary sedimentation tank and return sludge system.The brush in the ditch runed in turn at high speed and low speed, will enable the two ditches in the anoxic and aerobic states in turn. Oxidation ditch with only alternate lines Nitrification and denitrification,it was the process. developed specifically for biological nitrogen removal. The two oxidation ditches connected with each other,and run in series, the water follow in and out of.in turn. Set the anaerobic in the former of the oxidation ditch, sludge back to the anaerobic part, biological phosphorus removal can be achieved, and phosphorus removed with the sludge ultimately. The whole system remove nitrogen and phosphoru while achieve the effect of removal.of Organic pollutants.

Key words: Sewage Treatment; oxidation ditch; operation