生物增量诱导的同化硫酸盐减少和链延长减轻了下水道中的H2S和CH4排放
Zheng Qi1, Jinliang Xie1, Tipei Jia1
1State Key Laboratory of Regional Environment and Sustainability, School of Environment, Tsinghua University, Beijing, 100084, China.
Water research
|December 24, 2025
概括
使用 Bacillus subtilis 和 Saccharomyces cerevisiae 的生物增量可显著减少下水道气体排放,为化学处理提供可持续的替代方案. 这种方法降低了硫化和甲水平,提高了安全性,减少了对环境的影响.
科学领域:
- 环境微生物学环境微生物学
- 废水工程 废水工程
- 生物技术是生物技术.
背景情况:
- 控制硫化 (H2S) 和甲 (CH4) 排放对于下水道系统安全至关重要.
- 生物增量为控制排放的化学剂量提供了一个可持续且具有成本效益的替代方案.
- 在下水道环境中生物增强的性能和潜在机制需要进一步研究.
研究的目的:
- 研究使用 Bacillus subtilis 和 Saccharomyces cerevisiae 进行生物增强的有效性,以控制实验室规模下水道反应堆中的 H2S 和 CH4 排放.
- 阐明通过生物增量减少排放的机制.
- 为了比较生物增量对传统化学剂量的环境和经济效益.
主要方法:
- 实验室规模的下水道反应器被注射了细菌和细菌 (107 CFU/mL) 7 天.
- 随着时间的推移,监测了气体排放水平 (H2S和CH4).
- 分析了微生物群落组成 (SRB,MA) 和关键代谢物 (乙酸,中链脂肪酸).
- 进行了生命周期评估和成本分析.
主要成果:
- 经过7天的生物增量注射,H2S和CH4排放量分别减少了86.1%和62.9%.
- 与化学剂量相比,生物增量将有效的H2S控制持续时间延长了20-300%.
- 机制包括增加同化硫酸盐减少 (将SRB丰度从17.5%降低到0.2%) 和链延长 (将MA丰度从17.4%降低到0.5%).
- 生命周期评估显示,运营成本减少了7.4%,温室气体排放减少了60.6%.
结论:
- 用B. subtilis和S. cerevisiae进行生物增量是一种非常有效的策略,用于持续控制下水道系统中的H2S和CH4排放.
- 主要的H2S缓解途径涉及将硫酸转移到氨基酸生物合成,减少SRB的电子受体.
- 通过生物增量诱导的链延长来实现CH4缓解,产生对甲原体古生物不太有利的中链脂肪酸.
- 生物增量比化学剂量提供了显著的环境和经济优势.
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