对NaClO诱导的聚乙烯微塑料的新见解影响了活性污泥中的污水处理
Jin Xu1, Xiuhong Liu1, Yimai Zhou1
1Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China; National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China.
Journal of environmental management
|May 30, 2025
概括
低化物 (NaClO) 和微塑料 (MPs) 一起对废水处理中的活性污泥造成伤害. 这种共同暴露会抑制关键的酶和细菌,损害营养物质的去除和损害细胞膜.
科学领域:
- 环境科学 环境科学
- 环境化学环境化学
- 微生物学 微生物学
背景情况:
- 微塑料 (MP) 在废水处理厂 (WWTP) 生物反应堆中积累,特别是膜生物反应堆 (MBR).
- 在MBR膜清洁过程中,常见的清洁剂二 (NaClO) 与MP接触.
- 了解NaClO和MP在活性污泥上的联合毒性对于WWTP运行至关重要.
研究的目的:
- 调查活性污泥对NaClO和MPs同时暴露的毒性机制.
- 评估对营养去除效率和关键微生物酶的影响.
- 阐明氧化应激和添加剂释放在毒性中的作用.
主要方法:
- 在模拟的MBR条件下,活性污泥暴露于NaClO和PVC-MPs.
- 监测了化学氧气需求 (COD),总 (TN) 和总 (TP) 的去除效率.
- 分析了与营养代谢和微生物社区组成相关的酶活动.
- 研究了氧化应激水平和微塑料液成分.
主要成果:
- 同时暴露于NaClO和MPs最初减少了COD,TN和TP的去除,在NaClO应激下没有恢复.
- 参与代谢的关键酶 (AMO,NXR,NIR,NAR) 和占主导地位的去除的细菌受到抑制.
- NaClO压力改变了MP液,增强了BPA等添加剂的释放.
- 联合暴露增加了氧化应激,导致活性污泥细胞膜损伤.
结论:
- NaClO和MPs的同时暴露显著损害了活性污泥的性能和微生物群落结构.
- 主要毒性机制涉及增强的氧化应激,独立于添加剂释放.
- 这凸显了需要管理WWTP中的MP积累和NaClO使用,以防止操作中断的必要性.
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