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在高密度聚乙烯地质膜中对多多醇基物质 (PFAS) 的吸附和扩散

Aamir Ahmad¹, Kuo Tian¹, Burak Tanyu¹

¹Department of Civil and Environmental Engineering, George Mason University, Fairfax, VA, 22030, USA.

Waste management (New York, N.Y.)

|November 23, 2023

概括

这项研究表明,per-和多醇基物质 (PFAS) 通过高密度聚乙烯 (HDPE) 地质膜吸收和扩散. 含有胺和硫基组的PFAS被更强烈地吸收,随着分子重量的增加,扩散率下降.

科学领域:

环境科学环境科学
地质技术工程地质技术工程
化学工程是化学工程的重要组成部分.

背景情况:

和多醇基物质 (PFAS) 是持久性有机污染物.
垃圾填埋场复合系统通常使用高密度聚乙烯 (HDPE) 地质膜 (GM).
通过HDPE GM了解PFAS的命运和运输对于环境保护至关重要.

研究的目的:

通过HDPE研究各种PFAS的吸附和扩散.
评估PFAS链条长度和功能组对运输的影响.
在垃圾填埋系统中估计PFAS质量流量和突破时间.

主要方法:

实验室测试测量多个PFAS的分区系数 (Kd) 和扩散系数 (Dg).
对PFAS的分析包括PFCAs,PFSAs,FOSAAs,FtSAs,FOSA和X世代的分析.
数学建模以估计质量流和扩散突破时间.

主要成果:

分割系数 (Kd) 在3.8到98.3L/kg之间.
含有胺和硫基的PFAS比含有碳酸基的PFAS更强烈地吸附.
PFCA和PFSA的扩散系数 (Dg) 为10^-18到10^-17 m2/s,随着分子质量而下降.
据估计,完整的1.5毫米HDPE GM的扩散突破时间超过了1526年.

结论:

HDPE GM为PFAS迁移提供了一个重要的障碍.
PFAS的吸附和扩散受分子量和功能群的影响.
在垃圾填埋场长期制PFAS是可行的,完好无损的HDPE GM.

关键词:

扩散系数扩散系数第X代,第X世代的人.这是一种HDPE.在PFAS中,我们可以使用PFAS.对于PFCAs来说,这是一个很好的选择.金融金融管理局 (PFSAs) 的吸附吸附方式吸附吸附方式

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