单层和双层衬垫对垃圾填埋场中全氟辛烷磺酸对地下含水层影响的影响

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-09-20 DOI:10.1016/j.geotexmem.2024.09.009
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引用次数: 0

摘要

研究了全氟辛酸(PFOA)在含水层下通过单层或双层复合衬垫系统衬垫的城市固体废物填埋场底部的迁移情况。介绍了为获得 PFOA(和其他 PFAS)在不同应力水平下通过高密度聚乙烯和 GCL 的渗透系数而进行的实验,并给出了实验结果。介绍了实验得出的 PFAS 溶液渗透界面渗透率和 GCL 水导率。然后将实验得出的 PFOA 参数与有限元软件一起用于模拟 PFOA 通过垃圾填埋场孔状皱纹的扩散和扩散-平流传输。报告了建模含水层中全氟辛烷磺酸的峰值浓度,并将其与不同辖区的全氟辛烷磺酸最高允许饮用水规定进行了比较。进行了敏感性分析,以评估不同参数对含水层污染程度的影响。在土工膜无孔的情况下(纯扩散传输),单层和双层阻隔系统均符合所有法规限值。PFOA 通过有孔皱褶的渗漏量超过监管限值的情况各不相同,这取决于 PFOA 的初始浓度和辖区允许的限值。大多数结果表明,所研究的单层复合衬垫阻隔系统不太可能将 PFOA 控制在可接受的水平。如果通过主衬垫收集到大部分泄漏物,双衬垫系统更有可能满足监管要求。
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Implications of single and double liners on the impact of PFOA in landfills on an underlying aquifer

The transport of perfluorooctanoic acid (PFOA) through the base of a municipal solid waste landfill lined by a single or double composite liner system underlain by an aquifer is examined. Experiments conducted to obtain permeation coefficients for PFOA (and other PFAS) through HDPE and a GCL at different stress levels are described and the results presented. Experimentally derived interface transmissivity and GCL hydraulic conductivity permeated by a PFAS solution are presented. The experimentally derived parameters for PFOA are then used together with finite element software to model diffusive and diffusive-advective transport of PFOA through holed wrinkles from a landfill. The peak concentrations of PFOA in the modelled aquifer are reported and compared to the maximum allowable drinking water regulations for PFOA in different jurisdictions. A sensitivity analysis is performed to assess the effect of different parameters on the degree of contamination of the aquifer. With no holes in the geomembrane (pure diffusive transport), all regulatory limits are met for both single and double-lined barrier systems. The amount of leakage through holed wrinkles required for PFOA to exceed regulatory limits varies depending on the initial concentration of PFOA and jurisdictional allowable limits. Most results showed that the single composite liner barrier system examined is unlikely to be sufficient to contain PFOA to an acceptable level. The double liner system is more likely to meet regulatory requirements if most of the leakage through the primary is collected.

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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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