微塑料通过调节碳气合中的电子传输来增强糖原积聚生物的脱化
Yuchao Liu1, Jinrui Cao2, Sheng Li1
1College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, China; Military Medical Sciences Academy, Academy of Military Sciences, Tianjin, China.
Journal of hazardous materials
|February 26, 2025
概括
微塑料颗粒大小显著影响了由糖原积聚生物 (GAO) 产生的废水脱. 较大的微塑料 (100μm PVC) 提高了效率,而较小的 (100nm PVC) 抑制了效率,揭示了尺寸依赖的机制.
科学领域:
- 环境微生物学环境微生物学
- 废水处理技术 废水处理技术
- 微塑料的污染 微塑料的污染
背景情况:
- 微塑料 (MP) 越来越多地污染废水处理系统,影响微生物代谢.
- 对于MPs对糖原积聚生物体 (GAO) 脱过程的具体影响尚不清楚.
研究的目的:
- 调查不同类型和大小的MP如何影响GAO脱.
- 阐明MP诱导的GAO代谢和基因表达的变化的潜在机制.
主要方法:
- 在GAO活性污泥中引入各种微塑料类型和度.
- 评估脱效率,聚基酸盐 (PHB) 降解,活性氧物种 (ROS) 水平,电子输送链 (ETC) 活性和细胞内尼古丁胺胺氨酸二核酸 (NADH) 含量.
- 转基因组分析以确定参与碳-代谢和氧化酸化的差异表达基因.
主要成果:
- 添加100微米的PVC将GAO脱效率提高了14.6%,而100纳米的PVC则降低了8.4%.
- 100纳米的PVC抑制了PHB降解,而100微米的PVC则促进了降解.
- 观察到MP大小对ROS,ETC活性和NADH含量的差异性影响,以及关键代谢基因 (例如,phaC,CS,nuoL) 的改变表达.
结论:
- 100微米的PVC通过促进PHB分解和增加NADH电子捐赠能力来增强GAO脱.
- 100纳米的PVC抑制了脱,可能是通过对代谢途径的负面影响.
- 微塑料颗粒大小在调节活性污泥中碳-联的过程中起着至关重要的作用,为工艺控制提供了一个新的机制.
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