硫化物对DNRA分布和微生物群落结构在硫化物驱动的酸盐减少过程中的作用
Xiaoling Li1, Jianqiang Zhao2, Zhaolin Lu3
1Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-Rural Development, School of Civil Engineering, Chang'an University, Xi'an, 710054, China.
概括
在硫驱动的自脱过程中,与硫化物/酸盐比率的增加一起,分散性酸盐降解为 (DNRA) 成为主导性. 这种微生物过程为增强生物去除提供了见解,特别是在anammox.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学循环的过程
- 废水处理 废水处理
背景情况:
- 微生物酸盐降解涉及竞争性脱化 (DEN) 和异型酸盐降解 (DNRA) 途径.
- 了解DNRA在硫驱动过程中的作用对于优化去除至关重要.
研究的目的:
- 调查DNRA在硫驱动的自无化过程中的分布和主导地位.
- 为了确定不同硫化物/酸盐 (S/N) 比率对DNRA患病率的影响.
主要方法:
- 实验室规模的生物膜批量反应器 (SBBR) 测序实验.
- 批量测试采用受控的,增加的S/N比率 (1.5:1, 1.7:1, 2:1).
- 监测氧化降解潜力 (ORP) 和16S rRNA基因测序,用于微生物社区分析.
主要成果:
- 随着S/N比率的增加,DNRA的主导地位增加,在1.5:1比率上达到35.3%.
- 只有SOAD条件下的酸盐/酸盐消费的明显ORP拐点,在DNRA共存时重叠.
- 确定了Ignavibacterium,Hydrogenophaga和Geobacter作为关键的DNRA种类.
结论:
- 在较高的S/N比率下,DNRA成为硫化物氧化自脱 (SOAD) 的重要途径.
- 通过ORP模式和微生物社区分析,可以监测DNRA分歧.
- 结果为改善生物去除提供了洞察力,特别是与anammox过程结合使用.
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