从激活到稳定:决定性选择和适应机制重塑微生物群体,以在批量到连续污泥发酵过程中高效地生产挥发性脂肪酸
Liwei Wang1, Fanyun Meng1, Xupeng Li1
1National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, School of Environmental Science and Engineering, Beijing University of Technology, Beijing, 100124, PR China.
Environmental research
|October 2, 2025
概括
从批量到半连续模式的废物活性污泥 (WAS) 发酵过渡可以增强挥发性脂肪酸 (VFA) 的产生. 短时间的污泥保留时间 (SRT) 驱动微生物群体的聚集,有利于产生酸的细菌,并改善反应器的稳定性.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 废水处理 废水处理
背景情况:
- 废物活性污泥 (WAS) 的无氧发酵是一种可持续的废水处理方法.
- 批量到连续的操作策略可以最大限度地提高挥发性脂肪酸 (VFA) 的生产.
- 这一策略对微生物代谢和社区继承的影响尚不清楚.
研究的目的:
- 调查一批到半连续运行策略对微生物代谢活动和WAS发酵期间社区继承的影响.
- 了解在短污泥保留时间 (SRT) 下控制微生物群体聚集的机制.
主要方法:
- 一个WAS发酵系统在批量模式下运行了12天,随后进行了半连续运行,4天SRT.
- 分析了使用零模型分析的VFA生产,酸性比,生态网络结构和微生物社区组合.
主要成果:
- 半连续运行使VFA产量稳定在70%的酸化比率上,并且具有更稳定的生态网络.
- 微生物的代谢活动,最初被模式转换抑制,通过适应机制恢复.
- 简短的SRT充当了环境过器,促进了水解和酸性细菌,同时排除了VFA消费者.
结论:
- 批量阶段建立了高效的新陈代谢,而半连续阶段的短短的SRT驱动有益的微生物继承.
- 短期SRT下的决定性选择规范了社区集会,增强了稳定性和VFA生产.
- 结果提供了关于污泥发酵机制的见解,支持反应器调节和微生物社区设计.
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