RESEARCH PROGRESS ON EFFECTS OF TYPICAL HEAVY METAL IONS ON ANAMMOX DENITRIFICATION SYSTEM
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摘要: 厌氧氨氧化工艺具有无须外加碳源、产泥量少和能耗低等优势,应用前景较为广阔。但厌氧氨氧化菌对环境条件敏感,阻碍了该工艺的推广应用。重金属离子是影响厌氧氨氧化工艺的重要环境影响因子,且不同种类、价态和浓度的重金属离子造成的影响存在较大差异。选取含氮废水中的4种典型重金属离子(Cu2+、Zn2+、Fe2+和Fe3+),综述了其对厌氧氨氧化工艺脱氮效能的长短期影响,并从抗性基因和功能基因响应、胞外聚合物生成与微生物群落动态3个方面系统分析了重金属离子作用于厌氧氨氧化微生物菌群的内在机制。旨在全面分析重金属离子对厌氧氨氧化工艺及微生物菌群的影响,为提升厌氧氨氧化生物脱氮效能提供参考依据。Abstract: Anammox (anaerobic ammonium oxidation) is regarded as the most promising biological denitrification technique, due to its advantages such as no necessity for additional carbon, low sludge yield and low energy consumption. However, anammox bacteria are highly sensitive to external environmental factors, which hinders its large-scale application. Heavy metal ions in industrial sewage are important environmental factors affecting the biological denitrification efficiency of anammox system. Moreover, the effect of heavy metal ions with different types, concentrations and valence state varies significantly. In this paper, the recent research results on the long and short term impact of typical heavy metal ions(Cu2+、Zn2+、Fe2+ and Fe3+) on anammox denitrification system were comprehensively summarized, and the internal mechanism of heavy metal ions acting on anammox microbial community was also systematically analyzed, to provide reference for improving denitrification efficiency.
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Key words:
- heavy metal ions /
- anammox /
- resistance gene /
- extracellular polymeric substance /
- microbial community
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