Transport parameters for PFOA and PFOS migration through GCL's and composite liners used in landfills

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Farah B. Barakat , R. Kerry Rowe , David Patch , Kela Weber
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Abstract

The effect of applied stress (20, 60, and 150 kPa) on the diffusion of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) through a geosynthetic clay liner (GCL) is examined. The diffusion coefficients deduced from GCL diffusion tests for PFOA and PFOS decrease linearly with decreasing final bulk GCL void ratio (increasing applied stresses). The different components of the same GCL are also tested for PFOA and PFOS sorption. No statistically significant sorption of PFOA is observed for any of the components of the GCL. However, some sorption of PFOS onto the cover and carrier geotextiles of the GCL is observed with in an average distribution coefficient, Kd ∼2.22 ml/g for the GCL. Permeants containing different PFAS compounds are tested to assess their impact on the Geomembrane (GMB) - GCL interface transmissivity in composite liners. Results show PFAS concentrations up to 20 ppm had negligible impact on the GMB-GCL interface transmissivity. Lastly, the GCL specimens extracted from the diffusion tests are tested for hydraulic conductivity. No impact of PFAS is seen on the hydraulic conductivity of GCLs subjected to high applied loads, but a small increase is seen on the GCLs subjected to relatively low applied stresses.

全氟辛烷磺酸和全氟辛烷磺酸通过垃圾填埋场使用的 GCL 和复合衬垫迁移的迁移参数
研究了外加应力(20、60 和 150 kPa)对全氟辛酸(PFOA)和全氟辛烷磺酸(PFOS)在土工合成粘土衬垫(GCL)中扩散的影响。从 GCL 扩散试验中推导出的 PFOA 和 PFOS 扩散系数随着 GCL 最终体积空隙率的降低(外加应力增加)而线性降低。还对同一种 GCL 的不同成分进行了 PFOA 和 PFOS 吸附测试。在 GCL 的任何成分中都没有观察到有统计学意义的 PFOA 吸附现象。不过,在 GCL 的覆盖层和载体土工织物上观察到了一些 PFOS 吸附现象,GCL 的平均分布系数 Kd ∼ 2.22 毫升/克。对含有不同 PFAS 化合物的渗透剂进行了测试,以评估它们对复合衬垫中土工膜 (GMB) - GCL 界面透射率的影响。结果表明,PFAS 浓度达到 20 ppm 时,对 GMB-GCL 界面透射率的影响可以忽略不计。最后,对从扩散测试中提取的 GCL 试样进行了水力传导性测试。结果显示,PFAS 对承受高外加载荷的 GCL 的水力传导性没有影响,但对承受相对较低外加应力的 GCL 的水力传导性有小幅增加。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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