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首页> 外文期刊>Environmental Science & Technology >Micellar Solubilization of Polynuclear Aromatic Hydrocarbons In Coal Tar-Contaminated Soils
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Micellar Solubilization of Polynuclear Aromatic Hydrocarbons In Coal Tar-Contaminated Soils

机译：煤焦油污染土壤中多核芳烃的胶束增溶

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摘要

Solubilization of PAHs from a coal tar-contaminated soil obtained from a manufactured gas plant (MGP) site was evaluated using nonionic polyoxyethylene surfactants at dosages greater than cmc. Up to 25% of Soxhlet-extractable PAHs could be solubilized at surfactant loadings of 0.3 g/g of soil in 16 days in completely stirred batch reactors. Longer periods were required to reach equilibrium at higher surfactant dosages. Raoult's law satisfactorily described the partitioning of constituent PAHs between the weathered coal tar and the micellar solution. An equilibrium model was developed to predict the Solubilization of PAHs from coal tar-contaminated soils for given properties of the soil, surfactant, and component PAHs. The model predicted Solubilization of constituent PAHs reasonably well at low surfactant dosages. At extremely high surfactant dosages, the model failed to reliably predict Solubilization. Presumably, mass transfer limitations prevented attainment of equilibrium during the duration (380 h) of Solubilization experiments.
机译：使用大于cmc的剂量的非离子型聚氧乙烯表面活性剂评估了从人造煤气厂（MGP）场所获得的煤焦油污染土壤中的PAHs增溶作用。在完全搅拌的分批反应器中，在表面活性剂负载量为0.3 g / g土壤的情况下，在16天内最多可溶解25％的索氏提取性PAHs。在较高的表面活性剂剂量下，需要更长的时间才能达到平衡。拉乌尔定律令人满意地描述了风化煤焦油和胶束溶液之间的多环芳烃的分配。针对土壤，表面活性剂和组分PAHs的给定特性，开发了一个平衡模型来预测从煤焦油污染的土壤中溶解的PAHs。该模型预测在低表面活性剂剂量下，成分PAHs的溶解效果相当好。在极高的表面活性剂剂量下，该模型无法可靠地预测增溶作用。据推测，传质限制限制了增溶实验持续时间（380 h）的平衡。

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