尼特罗斯皮拉 主导的针点,具有颗粒状的沉降性,在动反应堆中具有氧/低氧/氧气区域
Hussain Aqeel1, Bruke Asefa1, Steven N Liss1,2,3
1Chemistry and Biology, Toronto Metropolitan University, Toronto, ON, Canada.
Frontiers in microbiology
|December 19, 2023
概括
在自营化过程中,生物质沉积得到改善,观察到颗粒型污泥的特性. 微生物群落的转变,特别是尼特洛斯皮拉的占主导地位,与废水处理反应堆中沉积和氨氧化的增强相关.
科学领域:
- 环境微生物学环境微生物学
- 废水处理工程 废水处理工程
- 生物反应器的设计和运行
背景情况:
- 自营化对于废水中的氨去除至关重要.
- 生物质的特性,包括沉性质,显著影响处理效率.
- 了解微生物社区动态是优化化过程的关键.
研究的目的:
- 调查自营化过程中的生物质特征和微生物社区动态.
- 为了将这些动态与混合反应堆 (STR) 中生物质的沉积特性相关联.
- 确定参与化过程中的关键微生物参与者及其对氨荷载的反应.
主要方法:
- 两个20升式反应堆 (STR) 的运行,有氧/低氧/氧区.
- 在自化阶段,合成废水中的氨度逐步增加.
- 对生物质沉性质 (SVI),细胞外聚合物质 (EPS) 比率 (PN:PS,TB:LB) 和微生物群体结构 (dd-PCR,16S rRNA基因测序) 的分析.
主要成果:
- 生物质沉特性在自营性阶段得到改善,R1呈现颗粒状沉 (SVI30改善至29毫升/克MLSS).
- 蛋白质与多糖的比率 (PN:PS) 和紧密结合 (TB) 与松散结合 (LB) 的EPS比率在自营化过程中增加,与改善的沉相关.
- 尼特罗斯皮拉被确定为主要的化细菌,在低氨水平下,Comammox Nitrospira占主导地位. 规范性氨氧化细菌的丰富性随着氨度的增加而增加.
结论:
- 随着氨荷重的增加,自身化可以增强生物质的沉特性,从而产生类似颗粒污泥的特性.
- PN:PS和TB:LB的EPS比率是生物质在化过程中的沉降性指标.
- 尼特洛斯皮拉,包括康马莫克斯,在氨氧化中起着重要作用,社区结构适应氨负荷.
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