通过Fe (III) 暴露来抑制活性污泥中的去除性能:主导代谢途径中的过渡
Yiyihui Hong1, Hong Cheng1, Xiaoliu Huangfu1
1Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, China.
Frontiers in microbiology
|June 27, 2024
概括
废水处理中的铁 (III) 通过将微生物代谢从聚酸盐积累转向糖原积累来抑制生物去除. 这降低了活性污泥系统中吸收效率.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生物技术是生物技术.
背景情况:
- 同时的化学和生物除对于废水处理至关重要.
- 铁 (III) 盐用于化学去除,但它们对生物系统的影响仍有争议.
- 了解铁的抑制机制是优化废水处理的关键.
研究的目的:
- 研究铁对生物去除的抑制作用.
- 阐明铁 (III) 如何影响聚酸盐积聚生物 (PAO) 的机制.
- 评估慢性铁 (III) 暴露对活性污泥中微生物代谢的影响.
主要方法:
- 使用六个测序批量反应器 (SBR) 进行了为期155天的实验.
- 使用的合成废水含有不同的铁 (III) /比率 (Fe/P = 1-2).
- 评估了急性和慢性铁 (III) 暴露对PAO生长和代谢的影响.
主要成果:
- 长时间的铁 (III) 暴露减少了PAO (26.01-64.13%的对照组) 中的细胞内储存.
- 高剂量的铁 (III) 显著抑制了的释放和吸收,尽管存在PAO.
- 在铁 (III) 压力下观察到糖原代谢基因丰度增加和聚酸盐代谢基因丰度减少.
结论:
- 暴露于铁 (III) 转移了占主导地位的微生物新陈代谢,从聚酸盐积累到糖原积累.
- 这种代谢转移降低了活性污泥中生物去除的效率.
- 这些发现强调了需要管理铁 (III) 的添加,以避免损害生物去除性能.
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