Effect of influent C/N ratio on N2O emissions from anaerobic/anoxic/oxic biological nitrogen removal processes
文献类型：期刊论文
| 作者 | Han, Yunping; Zheng, Jiaxi; Yan, Xu; Liu, Jianwei; Sun, Jianhui |
| 刊名 | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
 |
| 出版日期 | 2017-10-01 |
| 卷号 | 24期号:30页码:23714-23724 |
| 关键词 | Biological Nitrogen Removal Greenhouse Gas Nitrous Oxide C/n Ratio Anaerobic/anoxic/oxic Process Nosz Gene |
| 英文摘要 | The problem of producing strong greenhouse gas of nitrous oxide (N2O) from biological nitrogen removal (BNR) process in wastewater treatment plants (WWTP) has elicited great concern from various sectors. In this study, three laboratory-scale wastewater treatment systems, with influent C/N ratios of 3.4, 5.4, and 7.5, were set up to study the effect of influent C/N ratio on N2O generation in anaerobic/anoxic/oxic (A(2)O) process. Results showed, with the increased influent C/N ratio, N2O generation from both nitrification and denitrification process was decreased, and the N2O-N conversion ratio of the process was obviously reduced from 2.23 to 0.05%. Nitrification rate in oxic section was reduced, while denitrification rate in anaerobic and anoxic section was elevated and the removal efficiency of COD, NH4+-N, TN, and TP was enhanced in different extent. As the C/N ratio increased from 3.4 to 7.5, activities of three key denitrifying enzymes of nitrate reductase, nitrite reductase, and nitrous oxide reductase were increased. Moreover, microorganism analysis indicated that the relative abundance of ammonium-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) were positively correlated with N2O generation, which was reduced from (8.42 +/- 3.65) to (3.61 +/- 1.66)% and (10.38 +/- 4.12) to (4.67 +/- 1.62)%, respectively. NosZ gene copy numbers of the A(2)O system were increased from (1.19 +/- 0.49) x 10(7) to (2.84 +/- 0.54) x 10(8) copies/g MLSS with the influent C/N ratio elevated from 3.4 to 7.5. Hence, appropriate influent C/N condition of A(2)O process could optimize the microbial community structure that simultaneously improve treatment efficiency and decrease the N2O generation. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/39170]  |
| 专题 | 生态环境研究中心_大气环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Han, Yunping,Zheng, Jiaxi,Yan, Xu,et al. Effect of influent C/N ratio on N2O emissions from anaerobic/anoxic/oxic biological nitrogen removal processes[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2017,24(30):23714-23724. |
| APA | Han, Yunping,Zheng, Jiaxi,Yan, Xu,Liu, Jianwei,&Sun, Jianhui.(2017).Effect of influent C/N ratio on N2O emissions from anaerobic/anoxic/oxic biological nitrogen removal processes.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,24(30),23714-23724. |
| MLA | Han, Yunping,et al."Effect of influent C/N ratio on N2O emissions from anaerobic/anoxic/oxic biological nitrogen removal processes".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 24.30(2017):23714-23724. |
入库方式： OAI收割
来源：生态环境研究中心
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