中文关键词生物脱氮微气泡曝气生物膜反应器厌氧氨氧化功能菌群 英文关键词biological nitrogen removalmicrobubble aerationbiofilm reactorANAMMOXfunctional bacterial population

作者	单位	E-mail
刘春	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018	liuchun@hebust.edu.cn
王聪聪	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018
陈晓轩	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018
张静	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018
张瑞娜	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018
张磊	河北科技大学环境科学与工程学院, 河北省污染防治生物技术重点实验室, 石家庄 050018

中文摘要 微气泡曝气生物膜反应器是微气泡曝气技术与好氧生物处理相结合的新型处理工艺.本研究采用微气泡曝气生物膜反应器在低气水比下处理低C/N比废水，考察了生物脱氮过程和性能，并分析了脱氮功能菌群变化.结果表明，通过低气水比（小于1：2）控制DO浓度并降低进水C/N比，可以实现生物脱氮过程从同步硝化-反硝化向同步短程硝化-厌氧氨氧化-反硝化（SNAD）过程转变，并可获得较高的低C/N比废水生物脱氮性能.DO浓度低于1.0 mg·L^-1、进水C/N比为1：2.8时，SNAD过程成为生物脱氮的主要途径，TN平均去除率可达到76.3%，TN平均去除负荷为1.42 kg·（m³·d）^-1，厌氧氨氧化过程对TN去除的贡献率为86.0%.随着进水C/N比降低，生物膜中亚硝化菌群和厌氧氨氧化菌群的相对丰度逐渐增加，而硝化菌群和反硝化菌群的相对丰度逐渐降低.生物脱氮功能菌群变化与脱氮过程转变为SNAD过程相一致. 英文摘要 The microbubble-aerated biofilm reactor as a new treatment process combines microbubble aeration technology with aerobic biological treatment. A microbubble aerated biofilm reactor was used in this study to treat low C/N ratio wastewater at a low air/water ratio. The process and performance of biological nitrogen removal were investigated, and the functional bacterial populations for nitrogen removal in the biofilm were analyzed. The results showed that the biological nitrogen removal process was converted from simultaneous nitrification-denitrification to simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) processes when DO concentration was controlled by an air/water ratio of lower than 1:2 and the influent C/N ratio was reduced. As a result, the efficient biological nitrogen removal performance was achieved when treating low C/N ratio wastewater. When the DO concentration was lower than 1.0 mg·L^-1 and the influent C/N ratio was 1:2.8, the SNAD process became dominant for biological nitrogen removal. In this case, the average total nitrogen (TN) removal efficiency was 76.3%, and the average TN loading rate removed was 1.42 kg·(m³·d)^-1. In addition, it was estimated that 86.0% of TN removal was attributed to the ANAMMOX process. The relative abundances of ammonia-oxidizing bacteria populations and ANAMMOX bacteria populations in the biofilm increased gradually, while the relative abundances of nitrite-oxidizing bacteria populations and denitrifying bacteria populations decreased gradually, with a decrease in influent C/N ratio. The variation of functional bacterial populations for nitrogen removal was consistent with the conversion of nitrogen removal process to SNAD process.

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