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中文摘要：
A2N（厌氧／缺氧和硝化）反硝化除磷脱氮工艺是基于反硝化聚磷菌缺氧吸磷理论开发的新工艺。介绍了AzN工艺的原理和特点，对其影响因素诸如水力停留时间、溶解氧、NO3^-和NO2^-的浓度、原水中COD与TN的质量比、容积交换比及出水SS等进行讨论和分析，并综合国内外的研究结果给出工艺关键影响参数的设定范围。
英文摘要：
A2N （anaerobic/anoxic/nitrifying） denitrifying phosphorus and nitrogen removal process is a new process developed based on the theory of phosphorus uptake by denitrifying phosphorus accumulating organisms under anoxic condition. The principle and the characteristics of A2N process was introduced, the influencing factors such as hydraulic retention time, dissolved oxygen, mass concentration of NO3^- and NO2^-, mass ratio between COD and TN in the raw water, volumetric exchange rate, effluent SS etc. were discussed and analyzed. The design ranges of the key influencing parameters of the process were proposed consulted with the study results in China and aboard.
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