Abstract The bentonite and ocean-floor clay used in hydraulic barriers for on-land and ocean waste disposal sites, respectively, act as the last defense against environmental pollution, and therefore must have high chemical resistivity and long-term stability. The primary factors that determine the hydraulic conductivity of bentonite and ocean-floor clay are the polarity and functional groups of their organic compounds as well as their concentration and hydration characteristics in solution. However, it is not known which of the organic compounds reduce the hydraulic barrier performance of clay liners, and the extent of degradation has not been quantified. Recently, high concentrations of 1,4-dioxane and bisphenol A have been detected in some waste leachates. Although these low-polarity compounds hinder the hydration reaction of clay minerals and increase the hydraulic conductivity of clay liners, the magnitude of their impact in the limited concentrations found in leachates remains unclear. In this study, long-term hydraulic conductivity tests are conducted on a bentonite liner and ocean-floor clay samples, where the permeation liquid contains 1,4-dioxane or bisphenol A. The hydraulic barrier performance is evaluated based on the hydraulic conductivity and the distribution coefficient.

中文翻译：

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1,4-二恶烷和双酚A对垃圾围堵设施粘土底衬水力阻隔性能的影响

摘要 分别用于陆地和海洋垃圾处理场液压屏障的膨润土和海底粘土是抵御环境污染的最后一道防线，因此必须具有高耐化学性和长期稳定性。决定膨润土和海底粘土导水率的主要因素是其有机化合物的极性和官能团，以及它们在溶液中的浓度和水合特性。然而，尚不清楚哪些有机化合物会降低粘土衬垫的水力屏障性能，并且降解程度尚未量化。最近，在一些垃圾渗滤液中检测到高浓度的 1,4-二恶烷和双酚 A。尽管这些低极性化合物阻碍了粘土矿物的水化反应并增加了粘土衬垫的导水率，但它们在渗滤液中发现的有限浓度下的影响程度仍不清楚。在这项研究中，对膨润土衬里和海底粘土样品进行了长期水力传导率测试，其中渗透液含有 1,4-二恶烷或双酚 A。水力屏障性能是根据水力传导率和分配系数。