在实验台规模的导热加热实验中,采用气体促进的NAPL运输
Liam M Price1, Kevin G Mumford1
1Department of Civil Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada.
Journal of hazardous materials
|December 17, 2025
概括
导热加热 (TCH) 在地下修复过程中可以移动三乙烯 (TCE) 和酸盐等污染物. 仔细的现场调查和整个区域的加热对于防止污染物传播至关重要.
科学领域:
- 环境工程 环境工程
- 地质技术工程 地质技术工程
- 整治技术 整治技术
背景情况:
- 导热加热 (TCH) 是一种地下修复技术,用于去除挥发性和半挥发性非水相液体 (NAPL).
- 在TCH过程中产生的气体有助于消除NAPL,但也可能导致NAPL在源区内外重新分布.
研究的目的:
- 在实验室TCH实验中,研究三乙烯 (TCE) 和酸盐在粗沙和中等沙子中的再分配.
- 了解不同土壤条件下NAPL运输和移除的机制.
主要方法:
- 在粗沙和中等沙子矩阵上使用TCH进行了实验.
- 引入三乙烯 (TCE) 和克酸盐作为代表性的NAPLs.
- 在加热过程中监控NAPL运输和相变 (例如,共同沸).
主要成果:
- 在粗沙中,不连续的气流通过双重排位和扩散促进了NAPL上升的运输.
- 在中等沙子中,连续的气体通道导致了有限的TCE再分配,但显著的向上和横向的石运输.
- 通过共同沸进行了TCE的去除,而只有具有较高挥发力的酸盐成分被耗尽.
结论:
- TCH 构成 NAPL 运输远离加热区的风险,需要进行彻底的现场调查和潜在的周边加热器.
- 必须对整个处理区进行完全加热,以确保移除流离失所的NAPLs.
- 了解土壤特性对于预测和减轻TCH修复期间NAPL再分配至关重要.
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