Sorption of organic contaminants by Oxford Clay and Mercia Mudstone landfill liners
Sorption of organic contaminants by Oxford Clay and Mercia Mudstone landfill liners
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牛津粘土和麦西亚泥岩垃圾填埋场衬垫对有机污染物的吸附
DOI：
10.1144/1470-9236/09-003
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发表时间：
2011
影响因子：
1.4
通讯作者：
Simoes A
中科院分区：
文献类型：
--
作者：
Simoes A
AbstractThis研究提供了一个评估的吸附能力的两个对比矿物衬垫或障碍广泛使用在英国的一系列不同的疏水性的有机污染物通常发现在垃圾渗滤液。批量测试（涉及甲苯，三氯苯，三氯乙烯和萘）表明，牛津粘土的吸附能力不仅显着大于麦西亚泥岩，但也大于许多土壤或粘土的吸附能力在文献中报道。麦西亚泥岩的有机碳标准化吸附系数（Koc）与已发表的和经验推导的Koc值相当，但牛津粘土的Koc被文献值低估了几个数量级。仅基于有机碳含量的估计也低估了牛津粘土对这些污染物的阻滞作用。无定形有机物（使用“煤岩学”方法表征的牛津粘土中有机物的主要成分）被认为是牛津粘土衬垫吸附能力提高的原因。在渗滤液中溶解的有机碳的存在下，吸附系数降低，这表明在合成地下水中得到的koc值可能高估了在填埋场的情况下的吸附能力。在这项研究中确定的吸附系数andKoc-Kow相关性可用于模拟有机污染物吸附在牛津粘土和麦西亚泥岩衬垫的填埋场风险评估的一部分，在没有现场的具体数据，特别是牛津粘土，已公布的相关性被证明是过于保守。对于其他类型的粘土衬垫材料，谨慎的做法是在确定有机碳特征后确定特定场地的吸附系数。渗滤液溶解有机碳和粘土衬垫有机碳组成对疏水性有机物吸附的影响有待进一步研究。
AbstractThis study provides an evaluation of the sorption capacity of two contrasting mineral liners or barriers widely used in the UK for a range of organic contaminants of varying hydrophobicity commonly found in landfill leachate. Batch tests (involving toluene, trichlorobenzene, trichloroethene and naphthalene) showed that the sorption capacity of Oxford Clay was not only significantly greater than that of Mercia Mudstone, but was also greater than the sorption capacity of many soils or clays reported in the literature. The organic carbon normalized sorption coefficients (Koc) for Mercia Mudstone were comparable with both published and empirically derivedKocvalues, but theKocfor Oxford Clay was underestimated by literature values by several orders of magnitude. Retardation of these contaminants by Oxford Clay was also under-predicted by estimates based solely on organic carbon content. Amorphous organic matter (the main component of the organic matter in the Oxford Clay as characterized using ‘coal petrography’ methods) was believed to be responsible for the elevated sorption capacity of the Oxford Clay liner. Sorption coefficients were reduced in the presence of dissolved organic carbon in leachate, suggesting that publishedKocvalues derived in synthetic groundwater may overestimate the sorption capacity in landfill scenarios. Sorption coefficients andKoc–Kowcorrelations determined in this study can be used for modelling organic contaminant sorption in Oxford Clay and Mercia Mudstone liners as part of landfill risk assessments in the absence of site-specific data, in particular for Oxford Clay, for which published correlations were shown to be too conservative. For other types of clay liner material, the cautious approach would be to determine site-specific sorption coefficients following characterization of the organic carbon. Further research is needed into the effects of leachate dissolved organic carbon and the composition of clay liner organic carbon on sorption of hydrophobic organic compounds.
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