微生物群落在无氧消化过程中适应低和中等盐度
Claribel Buenaño-Vargas1, M Cristina Gagliano2, Lara M Paulo1
1Microbial Ecology Laboratory, School of Biological and Chemical Sciences and Ryan Institute, University of Galway, University Road, Ireland.
The Science of the total environment
|October 1, 2023
概括
这项研究表明,如何利用混合反应器将无氧消化 (AD) 生物质适应到盐废水中,从而实现高效的处理. 适应生物质形成了稳定的聚合物,保持了工艺性能,并揭示了耐受性的关键微生物群落.
科学领域:
- 环境生物技术环境生物技术
- 微生物生态学 微生物生态学
- 污水处理 污水处理 污水处理
背景情况:
- 无氧消化 (AD) 是一种有前途的生物技术,用于处理高盐度废水.
- 无菌种的适应对于在盐水条件下AD的稳定性至关重要,因为未适应的生物质可以分解.
研究的目的:
- 用混合扩展颗粒式污泥床 (EGSB) - 无氧过器 (AF) 反应器研究生物质适应盐度.
- 评估混合反应堆配置在盐度适应过程中保留生物质的有效性.
- 分析微生物群落结构及其在发展耐受性中的作用.
主要方法:
- 使用了两个实验室规模的混合EGSB-AF反应堆,使用非适应的注射剂养5g Na+/L的合成废水.
- 监控生物质分解,聚合物形成和Na+/Ca2+积累.
- 将适应生物质转移到上游无氧污泥毯 (UASB) 反应堆,以评估颗粒形成和性能.
- 使用分子技术对核心微生物群进行了表征.
主要成果:
- 最初的生物质分解之后,在95天内迅速形成新的聚合物,表明微生物适应成功.
- 新形成的聚合物以 (Ca2+) 的代价积累了 (Na+),而不影响生物质保留或工艺性能.
- 混合反应堆设计和低上流速度对于生物质保留至关重要.
- 转移的生物质在UASB反应堆中形成了密集的颗粒,实现了与全尺寸适应污泥相当的性能.
- 一个包含特定细菌和古生物的核心微生物组被确定为耐受性和AD稳定性的关键.
结论:
- 混合EGSB-AF反应堆提供了一种低成本,有效的方法,用于将AD生物质与盐水排水相适应.
- 已确定的核心微生物群落对于建立耐受性和确保盐水环境中稳定的AD性能至关重要.
- 这种方法促进了AD技术的应用,用于处理具有挑战性的盐废水流.
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