聚乙烯微塑料干扰基于MICP的整治:对微生物性能和环境反应的双系统评估
Huayan Huang1, Maohang Jia1, Dinghua Peng1
1Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610065, PR China.
Journal of hazardous materials
|August 19, 2025
概括
聚乙烯微塑料 (PE-MPs) 通过压力细菌和改变矿物学,对修复产生微生物诱导的石沉 (MICP) 有负面影响. 然而,PE-MPs还降低了土壤中的流动性,表明了污染环境中的复杂相互作用.
科学领域:
- 环境微生物学 环境微生物学
- 生物修复是一种生物修复.
- 环境化学环境化学
背景情况:
- 微生物诱导的石沉 (MICP) 是一种有前途的技术,用于在受污染的地点固定重金属,如 (Cd).
- 越来越多的微塑料 (MPs),特别是聚乙烯微塑料 (PE-MPs) 的普及,引发了人们对它们对环境修复过程的潜在干扰的担忧.
- 对于PE-MPs对MICP介导的重金属整治的影响尚不清楚.
研究的目的:
- 研究不同尺寸 (1微米和50微米) 的PE-MPs对基于MICP的整治的影响.
- 评估PE-MPs对细菌生理学,矿物质形成和Cd固定在液体培养和土壤系统中的影响.
主要方法:
- 在水培养和土壤系统中使用Stenotrophomonas maltophila Z-6进行实验,用于MICP.
- 引入了不同度的1微米和50微米PE-MPs.
- 评估了细菌氧化应激 (CAT,SOD活动),生长 (OD600),Cd2+固定,矿产产品 (SEM,XRD),土壤物理化学性质 (pH,EC),酶活性,微生物群落结构和Cd流动性/生物可用性.
主要成果:
- PE-MPs诱导氧化应激并抑制水系统中的细菌生长,延迟Cd2+固定.
- SEM和XRD揭示了从瓦特里特转向石的转变,增强了Cd固定,特别是低度的1μmPE-MPs.
- 在土壤中,PE-MPs改变了土壤特性和微生物群落,但促进了矿化,降低了Cd的流动性和生物可用性.
结论:
- PE-MP对MICP表现产生复杂的影响,影响微生物生理学和矿物沉.
- 虽然PE-MPs可以在短期内抑制MICP,但它们可能会导致Cd在土壤环境中的流动性减少.
- 这些发现强调了在设计和实施基于MICP的修复策略时考虑PE-MP等新兴污染物的必要性.
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