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中文摘要：
应用A/O中试装置处理实际生活污水,研究了低DO浓度下系统对有机物、氨氮和总氮的去除效果.研究结果表明,低DO浓度下COD和氨氮的平均去除率分别为85%和92%.由于进水C/N比仅为2.93,总氮平均去除率仅为64%,但提高亚硝酸氮积累率可以提高总氮去除率,当亚硝化率从15%增加到85%,总氮去除率将增加12%.氨氮去除率和硝化速率、总氮去除率具有较好的相关性.维持低DO浓度可以实现亚硝酸型同步硝化反硝化反应,基于氮的物料平衡可知它占系统总氮去除率的5%～12%,增加DO浓度将破坏同步硝化反硝化（SND）现象.
英文摘要：
The COD, ammonia and total nitrogen （TN） removal efficiency were studied in the paper at low DO concentration in a pilot-scale A/O nitrogen removal plant treating domestic wastewater. The experimental resnlts showed that the COD and ammonia removal efficiency reach 85% and 92%, respectively. Because of the low influent COD/TN ratio （2.93）, the average TN removal efficiency was only 64% , while TN removal efficiency could be increased by 12% with the nitrite accumulation ratio increased from 15% to 85%. A good correlation of ammonia removal efficiency, nitrification rate and TN removal efficiency was found. Simultaneous nitrification and denitrification （SND） with nitrite at low DO level could be realized, which contributed to 5% - 12% TN nitrogen removal based on nitrogen mass balance, The SND would be damaged with the DO increased, and the mechanism of SND with nitrite was presented.
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