聚乙烯微塑料对污水沉积物中甲生成活性和微生物群落转移的影响取决于度
Lucheng Li1, Ting Xiao1, Zanji He1
1Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Bioresource technology
|March 30, 2025
概括
聚烯微塑料 (PS-MPs) 在下水道系统中显著影响无氧甲生成和甲氧化. 该研究揭示了一个复杂的,非线性剂量反应关系,影响微生物群落和生物气生产.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 废水工程 废水工程
背景情况:
- 微塑料 (MP) 是普遍存在的环境污染物,对无氧微生物过程的影响尚不清楚.
- 甲基生成对于有机物分解和生物气生产至关重要,对环境变化特别敏感.
- 特定的微塑料类型,如聚乙烯 (PS-MPs) 对模拟下水道沉积物中甲基生成的影响需要详细调查.
研究的目的:
- 为了研究不同度的聚乙烯微塑料 (PS-MP) 对模拟下水道沉积物中甲基生成的影响.
- 分析PS-MPs对微生物群落结构和参与甲基生成的关键代谢途径的影响.
- 确定PS-MPs对甲 (CH4) 氧化和相关微生物群落的剂量依赖影响.
主要方法:
- 模拟的下水道沉积系统暴露于聚乙烯微塑料 (PS-MPs) 的度为5,50和250毫克·L-1.1.
- 测量了甲基生成速率,以及辅酶F420和甲基辅酶M减少酶 (Mcr) 的活性.
- 使用分子技术分析了微生物群落结构,包括性甲基生物和甲基类生物.
主要成果:
- PS-MPs对甲基生成表现出非线性,度依赖的影响,在不同暴露水平下观察到显著增加.
- 暴露于PS-MPs增强了辅酶F420的活性,但抑制了Mcr,表明对甲生成途径的复杂影响.
- 较低的PS-MP度促进了性甲原体,而较高的度抑制了整体甲原体活性,并影响了CH4氧化.
结论:
- 在无氧系统中,PS-MP度和CH4动态之间存在明确的剂量反应关系.
- 微塑料对废水环境中的甲基生成和微生物相互作用产生复杂的影响.
- 研究结果为环境生物工程和可持续废物管理提供了关键的见解,特别是关于生物气生产和CH4减缓.
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