非生物降解的聚乙烯四甲酸微塑料和可生物降解的聚乳酸微塑料对活性污泥系统中去除的反应机制
1College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
The Science of the total environment
|February 2, 2024
概括
生物降解的微塑料 (MPs),如聚乳酸 (PLA),比非生物降解的微塑料 (如聚乙烯四甲 (PET)) 显著损害废水处理. 酸破坏氨氧化细菌,降低了去除效率.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 微塑料 (MP) 越来越多地被认为是环境污染物.
- 它们对生物废水处理过程的影响仍未得到充分研究.
- 了解MP影响对于保持水质至关重要.
研究的目的:
- 为了比较非生物降解 (聚乙烯二甲,PET) 和生物降解 (聚乳酸,PLA) 微塑料对生物废水处理的影响.
- 阐明PLA在测序批量反应器 (SBR) 中影响氨氧化的机制.
主要方法:
- 使用测序批量反应器 (SBR) 进行废水处理效率的比较分析.
- 暴露于聚乙烯二甲酸 (PET) 和聚乳酸 (PLA) 微塑料.
- 结构方程建模 (SEM) 来分析PLA对氨氧化通路的影响.
- 评估氨一氧化酶 (AMO) 活性,活性氧物种 (ROS),抗氧化酶活性和氨氧化细菌 (AOB) 丰富度.
主要成果:
- 无论是PET还是PLA,都降低了氨 (NH4+-N) 的去除效率.
- 与PET (1.7%) 相比,PLA导致了显著更大的减少 (21.2%).
- PLA抑制了氨一氧化酶 (AMO) 活性,增加了活性氧物种 (ROS) 和抗氧化酶活性,并减少了氨氧化细菌 (AOB) 的丰富性.
结论:
- 可生物降解的微塑料,特别是PLA,对生物废水处理构成的威胁比PET等非生物降解的MP更大.
- PLA对氨氧化的抑制作用与AOB活动和丰度的减少有关.
- 需要进一步的研究,以充分了解和减轻可生物降解的MPs对废水处理系统的影响.
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