According to the nearly two years of taiyuan city sewage plant operation data (2013～2015),the transformation of pollutants in improved type A2O process space distribution,such as COD,ammonia nitrogen,TP,were analyzed.The way and contribution proportion of nitrogen were quantitative analyzed.Nitrogen remoual mainly happens in the anoxic zone and sludge lead denitrifying region.Through further experiment ruled out the degree of nitration,reflux point location,anoxic zone volume (HRT) on nitrogen limitation,reflux ratio and reflux into the DO for inhibition of denitrification efficiency,and by adjusting the reflux ratio the effluent TN reach level reached A standard.%结合太原市某污水厂近二年运行数据(2013～2015年),分析了改良型A2O工艺中污染物转化的空间分布规律,如COD、NH3-N、TP,定量分析了脱氮的途径和贡献比例,提出脱氮主要发生在缺氧区以及污泥前置反硝化区.通过进一步实验排除了硝化程度、回流点位置、缺氧区容积(HRT)对脱氮限制,提出内回流比、回流带入DO对反硝化效率的抑制,并通过调整内回流比使出水TN达到一级A标准.
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