Nitrogen removal via nitrite from municipal wastewater at low temperatures using real-time control to optimize nitrifying communities.
Nitrogen removal via nitrite from municipal wastewater at low temperatures using real-time control to optimize nitrifying communities.
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DOI：
10.1021/es070850f
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发表时间：
2007-11
影响因子：
11.4
通讯作者：
Qing Yang;Yongzhen Peng;Xiuhong Liu;W. Zeng;T. Mino;H. Satoh
中科院分区：
文献类型：
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作者：
Qing Yang;Yongzhen Peng;Xiuhong Liu;W. Zeng;T. Mino;H. Satoh
尽管已经进行了许多关于通过亚硝酸盐脱氮的研究，但对低温下通过亚硝酸盐脱氮进行的研究非常有限。本研究为提高城市污水脱氮效率，采用工作容积为54 m3的序批式反应器中试装置，对常温和低温下城市污水中亚硝酸盐脱氮进行了研究。结果表明，脱氮效率较高，出水总氮低于3mg/L。采用实时控制，温度11.9~26.5℃，正常溶氧条件（≥2.5mg/L）下，成功、稳定地实现了长时间（180天）亚硝酸盐脱氮，亚硝酸盐平均累积率在95%以上。采用荧光原位杂交技术研究活性污泥中硝化微生物群落的数量变化。荧光原位杂交结果证实硝化微生物群落得到优化；氨氧化细菌成为主要硝化细菌，亚硝酸氧化细菌被从活性污泥中洗掉。
Although many studies regarding nitrogen removal via nitrite have been carried out, very limited research has been undertaken on nitrogen removal via nitrite at low temperatures. In this study, to improve the nitrogen removal efficiency from municipal wastewater, a pilot-plant of sequencing batch reactor with a working volume of 54 m3 was used to investigate nitrogen removal via nitrite from municipal wastewater at normal and low water temperature. The obtained results showed that high nitrogen removal efficiency with effluent total nitrogen below 3 mg/L could be achieved. Using real-time control with temperature ranging from 11.9 to 26.5 degrees C under normal dissolved oxygen condition (> or =2.5 mg/L), nitrogen removal via nitrite was successfully and stably achieved for a long period (180 days) with average nitrite accumulation rate above 95%. Fluorescence in situ hybridization was carried out to investigate the quantitative changes of nitrifying microbial community in the activated sludge. Fluorescence in situ hybridization results approved that the nitrifying microbial communities were optimized; ammonia oxidizing bacteria became the dominant nitrifying bacteria and nitrite oxidizing bacteria had been washed out of the activated sludge.