碳氮比对AOA-SBR同步脱氮除磷性能及N<sub>2</sub>O释放的影响

任丽芳; 巩有奎; 孙洪伟

doi:10.13205/j.hjgc.202405001

碳氮比对AOA-SBR同步脱氮除磷性能及N₂O释放的影响

doi: 10.13205/j.hjgc.202405001

1. 烟台职业学院建筑工程系, 山东烟台 264670;
2. 烟台大学环境与材料工程学院, 山东烟台 264005

基金项目:

烟职博士基金2018002号

国家自然科学基金项目(51668031)

详细信息

作者简介:
任丽芳(1977-),女,副教授,研究方向为水污染控制。260943813@qq.com

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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-12
- 网络出版日期: 2024-07-11

CHARACTERISTICS OF DENITRIFYING PHOSPHORUS REMOVAL AND N₂O EMISSION OF AN AOA-SBR UNDER DIFFERENT CARBON TO NITROGEN RATIOS (C/N)

1. Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China;
2. School of Environmental and Material Engineering, Yantai University, Yantai 264005, China

摘要

摘要: 通过逐步减少外加碳源降低进水碳氮比(C/N)、降低好氧曝气速率、延长好氧和缺氧阶段停留时间的方式,在厌氧/好氧/缺氧交替运行的SBR反应器(AOA-SBR)内,成功实现了生活污水同步脱氮除磷过程(SNDPR),并利用化学计量学方法考察了不同反应条件下AOA-SBR内PAOs、GAOs间竞争特性,确定了系统脱氮除磷性能及N₂O释放。结果表明:C/N降低同时减少好氧曝气量,增加好氧停留时间,有利于AOA-SBR内PAOs增殖,促进了反硝化除磷过程;C/N由7.0降至3.3,反应器平均TN去除率均达到80%以上,平均TP去除率则由65.2%增至81.2%。不同C/N条件下,AOA-SBR内厌氧、缺氧、好氧阶段微生物内源物质变化均呈现PAOs-GAOs共存特性,高COD/N条件下(COD/N=7.0),AOA-SBR倾向于富集GAOs的内源物质变化特性。高C/N条件促进了DGAOs内源反硝化过程,N₂O释放量增加,低COD/N条件下(COD/N=3.0),DPAOs大量增殖,DGAOs-DGAOs两者耦合内源反硝化过程,促进了N₂O还原,减少了N₂O释放;C/N由7.0降至3.3,N₂O释放量由2.23 mg/L降至1.05 mg/L,产率由7.21%降至3.94%。DGAOs内源反硝化与DPAOs反硝化除磷过程协同,能够充分利用原水中碳源,破解城市生活污水脱氮瓶颈。
- 碳氮比 /
- AOA-SBR /
- 同步脱氮除磷 /
- N₂O释放
Abstract: In the paper, the simultaneous nitrogen and phosphorus removal process (SNDPR) of domestic sewage was accomplished in the anaerobic/aerobic/anaerobic SBR (AAO-SBR) by gradually reducing the external carbon source addition, to reduce the carbon nitrogen ratio (C/N) of influent water, reducing the aerobic aeration rate, and increasing the residence time of aerobic and anoxic stages. The competition between PAOs and GAOs in AOA-SBR under different reaction conditions was investigated by the stoichiometric method, and the nitrogen and phosphorus removal performance, as well as the N₂O emission ratio of the system were determined. The results showed that reducing the aerobic aeration rate and increasing the aerobic residence time were conducive to the proliferation of PAOs in AOA-SBR under the condition of low carbon to nitrogen ratio, which promoted denitrification and phosphorus removal. When the C/N ratio decreased from 7.0 to 3.3, the average TN removal rate reached more than 80%, and the average TP removal rate increased from 65.2% to 81.2%. Under different C/N conditions, the changes of microbial endogenous substances in AOA-SBR at anaerobic, anoxic and aerobic stages showed the coexistence characteristics of PAOs-GAO. AOA-SBR tended to enrich the characteristics of GAOs endogenous substances at a higher C/N. Higher C/N condition promoted the endogenous denitrification process of DGAOs and increased the release of N₂O, and lower C/N promoted the proliferation of DPAOs. The coupled endogenous denitrification process of DGAOs-DGAOS promoted the reduction of N₂O, which reduced the emission of N₂O. As the C/N decreased from 7.0 to 3.3, the N₂O release decreased from 2.23 to 1.05 mg/L, and the emission ratio decreased from 7.21% to 3.94%. The collaboration between DGAOs endogenous denitrification and DPAOs endogenous denitrification phosphorus removal processes can make full use of carbon sources in raw domestic sewage, which may break the bottleneck of nitrogen removal in urban domestic sewage.
- carbon to nitrogen ratio /
- AOA-SBR /
- simultaneous nitrification and denitrification phosphorous removal process (SNDPR) /
- N₂O emission

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参考文献(33)

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