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微电极探测单级自养脱氮生物膜内N2O的产生
发表时间：2016-06-30 浏览量：1921 下载量：642
| 全部作者： | 王西西，方芳，陈猷鹏 |
| 作者单位： | 重庆大学城市建设与环境工程学院 |
| 摘 要： | 利用化学抑制剂区分生物脱氮过程中N2O的产生途径，采用微电极探测单级自养脱氮生物膜微区N2O的产生。研究显示，生物膜微区溶解氧（dissolved oxygen，DO）的消耗主要在生物膜约400 μm以内区域，NH4+和NO2-浓度沿生物膜深度方向逐渐降低，NO3-浓度呈先升高后降低的趋势，生物膜微区多种氮转化途径共存。生物膜微区N2O主要来自氨氧化细菌（ammonium-oxidizing bacteria，AOB）反硝化作用和异养反硝化作用，且推测AOB反硝化是最主要的N2O产生途径。 |
| 关 键 词： | 水污染防治工程；单级自养脱氮；微电极；氮转化；N2O |
| Title： | Detecting N2O production in biofilm from one-stage completely autotrophic nitrogen removal system by microelectrodes |
| Author： | WANG Xixi, FANG Fang, CHEN Youpeng |
| Organization： | School of Urban Construction and Environmental Engineering, Chongqing University |
| Abstract： | We used chemical inhibitor to distinguish N2O production pathway in nitrogen removal process, and utilized microelectrodes to investigate the N2O production from one-stage completely autotrophic nitrogen removal system. The results show that dissolved oxygen (DO) is mainly consumed over the outer 400 μm of the biofilm, NH4+ and NO2-concentrations decrease considerably along the depth of the biofilm, NO3- concentration increases firstly and then decreases, and multiple nitrogen transformation pathways are active in the biofilm. The main sources of N2O production are ammonium-oxidizing bacteria (AOB) denitrification and heterotrophic denitrification. It is speculated that AOB denitrification is the most important pathway for N2O production from the biofilm. |
| Key words： | water pollution prevention engineering; one-stage completely autotrophic nitrogen removal; microelectrodes; nitrogen transformation; N2O |
| 发表期数： | 2016年6月第12期 |
| 引用格式： | 王西西，方芳，陈猷鹏. 微电极探测单级自养脱氮生物膜内N2O的产生[J]. 中国科技论文在线精品论文，2016，9（12）：1226-1233. |
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