陈旧的微塑料纤维诱导活性污泥积聚:在序列批量反应器中,一种新的非丝状积聚行为
Yuanling Luo1, Jing Huang2, Yuting Ding3
1School of Ecology and Environment, Central South University of Forestry and Technology, Changsha 410004, China; Changsha Environmental Protection College, Changsha 410004, China.
Water research
|November 20, 2025
概括
陈旧的微塑料纤维 (MPF) 通过改变污泥特性和降低效率,导致废水处理中严重的非丝状污泥积聚. 这凸显了老年MPF带来的风险,以及需要更好的拦截策略.
科学领域:
- 环境科学 环境科学
- 水处理工程水处理工程
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料纤维 (MPF) 可以在活性污泥系统中积累,造成非丝状污泥积聚的风险.
- 陈旧的MPF对废水处理过程的影响在很大程度上仍未得到研究.
研究的目的:
- 为了比较评估原始和老的MPF对测序批量反应堆 (SBR) 性能的影响.
- 为了阐明老化MPF引发污泥积聚的机制.
主要方法:
- 用不同度 (1和10毫克L-1) 的原始和老化MPF对SBR性能进行比较分析.
- 陈旧的MPF的特征 (粗性,水性,生物膜粘附性) 和污泥特性 (SVI,EPS组成,氧气转移) 的分析.
- 光谱分析 (2D-COS) 用于理解细胞外聚合物质 (EPS) 中的功能组转换.
主要成果:
- 10毫克L-1的老化MPF导致了严重的污泥积聚 (SVI=280毫升g-1),并减少了40%的污染物去除.
- 陈旧的MPF增加了纤维的水性和生物膜粘附性,导致污泥中的保留率增加了六倍.
- 陈旧的MPF促进了多糖分泌细菌 (Nakamurella) 的生长和过度的EPS产量,损害了群体凝聚力和氧气转移 (>50%的减少).
结论:
- 陈旧的MPF通过物理-生化相互作用引发严重的非丝状污泥积聚,与丝状积聚机制不同.
- 这些发现强调了改善废水处理中的MPF拦截策略的急需性.
- 对纤维污染物的进一步研究对于保持废水处理效率和保护水生环境至关重要.
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