可生物降解和不可生物降解的微塑料对有氧颗粒污泥的性能和微生物群体表征的影响
Xiaoying Guo1,2, Xiaohang Ma3, Xiangyu Niu1,2
1School of Ecology and Environment, Zhengzhou University, Zhengzhou, China.
Frontiers in microbiology
|June 4, 2024
概括
微塑料 (MPs) 影响废水处理. 高度的MP阻碍了COD的去除,但生物降解和非生物降解的MP增强了和的去除,尽管非生物降解的MP对有氧颗粒性泥 (AGS) 系统构成更大的风险.
科学领域:
- 环境科学 环境科学
- 环境工程 环境工程
- 微生物学 微生物学
背景情况:
- 微塑料 (MP) 是新出现的污染物,环境中的存在越来越大.
- 国会议员可以吸附污染物并进入食物链,对生态系统和人类健康构成风险.
- 有氧颗粒污泥 (AGS) 是一个关键的废水处理技术,但其对MP污染的反应还没有得到充分研究.
研究的目的:
- 研究可生物降解 (聚乳酸,PLA) 和不可生物降解 (聚乙烯基四甲酸,PET) 微塑料对AGS性能的影响.
- 探索MP对AGS运营效率和微生物社区影响的潜在机制.
- 为了比较AGS对不同类型和不同度的MP的抗性.
主要方法:
- AGS系统暴露于不同度 (10,50,100毫克/升) 的PLA和PET.
- 监测了关键性能指标,如化学氧气需求 (COD) 清除,营养物质 (和) 清除以及污泥沉降性.
- 微生物群落分析的重点是关键品种如 *Candidatus_Competibacter* 和 *Acinetobacter* 的丰富性,以及像 *Thiothrix* 等细菌的存在.
主要成果:
- 高MP度 (100 mg/L) 通过阻断营养物质运输通道,显著降低了COD去除.
- PLA和PET都提高了和的去除效率,增加了总无机 (TIN) 和总 (TP) 的去除效率.
- 非生物降解PET对污泥沉降能力产生了负面影响,而高度的PLA和PET也促进了有害的*Thiothrix*生长,影响了反应堆的运行.
结论:
- 污染MP对AGS构成双重威胁,在高度下抑制COD去除,同时可能增强营养去除.
- 与生物降解PLA相比,像PET这样的非生物降解MP对AGS的稳定性和性能构成更大的风险.
- 进一步的研究对于了解和减轻非生物降解MPs对废水处理系统的长期影响至关重要.
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