微生物群结构在不同的有机载荷率下发生变化,以及它们对废水处理厂中聚酸酸盐生产的影响
Ylenia Di Leto1, Antonio Mineo2, Fanny Claire Capri1,3
1Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Palermo University, Viale Delle Scienze, 90128, Palermo, Italy.
Biodegradation
|August 9, 2025
概括
在废水处理中增加有机载荷率通过选择有益的微生物来促进聚酸酸盐 (PHA) 生物塑料前体的生产. 较高的比率可以提高循环生物炼油厂的PHA产量和微生物群落.
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
- 生物精炼是生物精炼的一种方式.
背景情况:
- 传统的废水处理厂 (WWTP) 正在向循环生物炼油厂过渡,以回收资源.
- 污水污泥 (SS) 微生物群可以将有机物质发酵成挥发性脂肪酸 (VFA).
- 微型酸盐是聚化酸盐 (PHAs) 的前体,是一种可持续的生物塑料替代品.
研究的目的:
- 在试点规模的废水处理系统中,研究有机载荷率 (OLR) 对PHA生产的影响.
- 了解SS微生物结构与不同OLR下PHA生产效率之间的关系.
- 为了确定与增强的PHA产量相关的微生物转移.
主要方法:
- 一个选择测序批量反应堆 (S-SBR) 在两个不同的OLR (0.8和1.3克COD L-1d-1) 下运行,使用合成VFA混合物.
- 一个盛宴-饥荒 (F/F) 周期被用来丰富产生PHA的微生物.
- 使用元类学分析来描述SS微生物群中的结构变化.
主要成果:
- 较高的OLR显著增加了PHA产量,在1.3gCOD L-1d-1下达到生物质含量的20%,而在0.8gCOD L-1d-1下达到15%.
- 基因组学分析显示,PHA产生细菌的选择,特别是在Proteobacteria类 (Rhodocyclaceae家族) 中,在较高的OLR.
- 增加特定细菌群的丰富性与增强的PHA生产和有机物质降解相关.
结论:
- 有机载荷率是优化废水生物炼油厂PHA生产的关键参数.
- 由OLR驱动的SS微生物群结构的变化直接影响PHA产量.
- 这些发现支持开发全面的生物炼油系统,以从废物中生产可持续的生物塑料.
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