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Enhanced dissolution of multiple-component nonaqueous phase organic liquids in porous media using Cyclodextrin : theoretical, laboratory, and field investigations

机译:使用环糊精增强多组分非水相有机液体在多孔介质中的溶解:理论,实验室和现场调查

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摘要

The effectiveness of a cyclodextrin (sugar-based) solution for enhancedsolubilization removal of multicomponent nonaqueous phase organic liquid (NAPL) contamination from an aquifer is tested in a pilot-scale field experiment. This effort is the first field test of this innovative technology, termed a "Complexing Sugar Flush" (CSF). The saturated zone within an enclosed cell was flushed with 8 pore volumes of 10wt% cyclodextrin solution. The cyclodextrin solution increased the aqueous concentrations of all the target contaminants to values from about 100 to more than 20,000 times the concentrations obtained during a water flush conducted immediately prior to the CSF. The degree of solubility enhancement was greater for the morehydrophobic contaminants. Conversely, the relative mass removal was greater for the less-hydrophobic compounds due to their generally higher apparent solubilities. The average reduction in NAPL mass for the target contaminants was about 41%. A relationship is developed to describe enhanced dissolution of a multiple-component NAPL, and is used to analyze the field data. The effluent concentrations for most of the target contaminants during the cyclodextrin flush were within a factor of two of the equilibrium values predicted using this theory. Deviations from ideal dissolution behavior were also observed. Finally, the cyclodextrin solution appeared to significantly enhance both the magnitude and the rate of NAPL dissolution compared to a water flush conducted prior to the cyclodextrin flush. These results contribute to a better understanding of the important physicochemical processes involved in using enhancedsolubilization agents for the remediation of multiple-component NAPLs.
机译:在中试规模的田间试验中测试了环糊精(糖基)溶液从水层中增溶去除多组分非水相有机液体(NAPL)污染的有效性。这项工作是这项创新技术的首次现场测试,被称为“复杂糖冲洗”(CSF)。用8孔体积的10wt%环糊精溶液冲洗封闭的室内饱和区域。环糊精溶液将所有目标污染物的水溶液浓度提高到大约CSF前进行的水冲洗过程中获得的浓度的100到20,000倍以上。对于疏水性更高的污染物,溶解度的提高程度更大。相反,由于疏水性较低的化合物通常具有较高的表观溶解度,因此其相对质量去除量较大。目标污染物的NAPL质量平均降低约41%。建立了一种关系来描述多组分NAPL的增强溶出度,并用于分析现场数据。在环糊精冲洗过程中,大多数目标污染物的废水浓度在使用该理论预测的平衡值的两倍之内。还观察到与理想溶解行为的偏差。最后,与在环糊精冲洗之前进行的水冲洗相比,环糊精溶液似乎显着提高了NAPL的溶解度和溶解速率。这些结果有助于更好地理解使用增强的增溶剂修复多组分NAPL所涉及的重要物理化学过程。

著录项

  • 作者

    McCray John Emory.;

  • 作者单位
  • 年度 1998
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  • 原文格式 PDF
  • 正文语种 en
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