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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:1896  下载量:632
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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