微塑料会影响膜生物污染和微生物群落在重力驱动的膜过的初级废水
Selina Hube1, Stefanie Veronelli2, Tian Li3
1Faculty of Civil and Environmental Engineering, University of Iceland, Hjardarhagi 2-6, IS-107, Reykjavik, Iceland.
Chemosphere
|March 10, 2024
概括
重力驱动膜 (GDM) 废水处理系统中的微塑料通过增加蛋糕形成来减少透流. 然而,它们改变了微生物群落,增强了特定的微生物和代谢功能,特别是在更小的尺寸和更高的度下.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 微生物学 微生物学
背景情况:
- 重力驱动膜 (GDM) 过是一种可持续的分散的废水处理方法.
- 微塑料是新兴的环境污染物,对GDM系统的影响尚不清楚.
- 了解微塑料的影响对于优化GDM性能和微生物生态至关重要.
研究的目的:
- 调查微塑料大小和度对GDM性能的影响.
- 分析微塑料对GDM系统中微生物社区结构和功能的影响.
- 评估微塑料对蛋糕层特性和膜污染的影响.
主要方法:
- 使用GDM系统进行初级城市废水处理的实验设置.
- 不同尺寸 (0.5-0.8μm,40-48μm) 和数量 (0.1,0.2g/L) 的微塑料的剂量.
- 通过测序和代谢功能分析,分析透流,蛋糕形成,细胞外聚合物 (EPS),双价和微生物群落组成 (核细胞前生物,核细胞前生物,病毒).
主要成果:
- 微塑料的添加使透流量减少了9-54%,这是由于蛋糕形成的增加 (高达6.4倍) 和EPS/双价离子沉积.
- 微塑料通过减少EPS-双价离子相互作用,创造了更多孔的,异质的蛋糕层.
- 微塑料改变了生物膜,减少了物种多样性,但增强了特定的原核生物,真核生物,病毒和氨基酸/脂质代谢,高度的小尺寸导致了最大的变化.
结论:
- 微塑料通过增强污染对GDM透流产生负面影响.
- 微塑料显著重塑了GDM系统中的微生物社区和代谢功能.
- 微塑料的尺寸和度是影响GDM废水处理中的膜性能和微生物生态学的关键因素.
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