对微塑料纤维在多孔介质中的运输和保留进行孔尺度洞察
Nirrit Cohen1, Yaniv Edery1, Adi Radian1
1Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
Environmental science & technology
|December 8, 2025
概括
农业土壤捕获微塑料纤维 (MPF). 较大,更硬的纤维被保留更多,而较小的纤维移动更快,改变了土壤的水流. 了解MPF的行为是土壤健康的关键.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 材料科学 材料科学 材料科学
背景情况:
- 农业土壤充当了微塑料纤维 (MPF) 的沉池.
- 对于MPF的运输和在土壤环境中的行为,人们的理解有限.
- 聚烯微纤维 (MPF) 是常见的环境污染物.
研究的目的:
- 研究微塑料纤维在类似土壤的多孔介质中的运输和保留机制.
- 确定MPF尺寸和弹性对其移动性的影响.
- 评估纤维捕获如何影响孔尺度流动力学.
主要方法:
- 利用微流体细胞模拟土壤多孔介质.
- 在受控流量条件下,有轨聚烯微纤维 (20-150微米).
- 分析了纤维大小和灵活性对运输和保留的影响.
主要成果:
- 光纤运输高度依赖于尺寸和灵活性.
- 长于50微米的纤维表现出显著的保留.
- 较短的纤维遵循优先流路径,经历更高的速度.
- 被捕获的纤维改变了孔尺度的流动模式,与球形粒子的行为不同.
结论:
- 微塑料纤维在多孔介质中的行为是复杂的,并受到物理性质的影响.
- 纤维的保留机制与球形颗粒的保留机制不同.
- 即使是少量的被困纤维也会对土壤的液压性能产生重大影响.
- 需要进一步的研究来改进预测土壤系统中MPF行为的模型.
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