通过动力选择的低溶解氧化
Jose Jimenez1, Kayla Bauhs1, Mark Miller1
1Brown and Caldwell, Walnut Creek, CA, USA.
Water research
|September 26, 2025
概括
污水处理中的低溶解氧 (DO) 转移了微生物群落,有利于comammox细菌有效去除氨,并可能减少氧化 (N2O) 排放.
科学领域:
- 环境微生物学 环境微生物学
- 废水处理工程 废水处理工程
- 生物地质化学循环的过程
背景情况:
- 活性污泥厂可以通过低溶氧 (DO) 运行来提高能源和碳效率.
- 了解微生物适应低DO对于优化化过程至关重要.
- 化是废水处理的一个关键过程,将氨转化为酸盐.
研究的目的:
- 调查微生物群落适应长期低DO条件的情况.
- 评估低DO对化率,微生物结构和N2O产生的影响.
- 为了评估comammox细菌 (CMX) 在低DO环境中的效率.
主要方法:
- 从实验室规模和实验室规模的废水处理实验中得出的结合结果.
- 分析微生物群落结构在不同DO水平下发生的变化.
- 测量化速率和氧化 (N2O) 的产生.
主要成果:
- 低DO受益于comammox细菌 (CMX) 和氨氧化古生物 (AOA) 而不是氨氧化和氧化细菌 (AOB,NOB).
- 在低DO系统中,酸盐生产与氨去除的比率接近1.0,表明CMX占主导地位.
- 适应的微生物群体表现出更高的氧 afinity,N2O 排放可能由于减少了 AOB / NOB 丰度而减少.
结论:
- 长期的低DO运行促进CMX主导,提高完全氨氧化效率.
- 微生物群落通过增加氧的亲和力来适应低DO.
- 低DO运行可以通过抑制参与其生产的关键微生物群体来减少N2O排放.
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