摘要:氧化溝是一種簡易的活性污泥系統，由活性污泥在閉合的曝氣渠道中循環流動，通過活性污泥中的微生物對污水中的有機污染物不斷地進行降解和去除，達到凈化污水的目的。氧化溝由于其出水水質好、運行穩定、管理方便等技術特點，在我國污水處理廠中有著較為廣泛的應用。本文首先闡述了城市污水處理的重要性，其次介紹了氧化溝工藝在污水處理中的發展、應用,以及幾種典型的氧化溝工藝。最后結合江寧污水廠實際，簡要分析了其氧化溝的運行情況。

　　　江寧污水處理廠分三期建設，采用了三種不同的氧化溝工藝。其中一期工程采用奧貝爾氧化溝工藝,二期工程采用A2/O法氧化溝工藝,本文簡要對一二期的氧化溝進行了介紹，三期工程日處理污水能力為4萬噸，采用雙溝氧化溝。

　　　雙溝系統，設有獨立的二沉池和回流污泥系統，通過兩溝內轉刷交替處于高速和低速運行，可使兩溝交替處于缺氧和好氧狀態，氧化溝內只是交替行著硝化和反硝化，是專為生物脫氮而開發的工藝。兩個氧化溝相互連通，串聯運行，可交替進出水。在氧化溝前設置厭氧段，污泥回流到厭氧段，可實現生物除磷，最終隨剩余污泥排除。整個系統去除有機物的同時達到脫氮除磷的效果。

關鍵詞：污水處理；氧化溝；運行

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