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首页> 外文期刊>Environmental Science & Technology >Compositional Evolution of the Emplaced Fuel Source in the Vadose Zone Field Experiment at Airbase Vaerlose,Denmark
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Compositional Evolution of the Emplaced Fuel Source in the Vadose Zone Field Experiment at Airbase Vaerlose,Denmark

机译：丹麦空军基地沃洛斯渗流区野外实验中所含燃料源的成分演变

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摘要

A field experiment was performed in a sandy vadose zone,studying the fate of an emplaced fuel-NAPL source,composed of 13 hydrocarbons and a tracer.The UNIFAC model was used to test the nonideal behavior of the source,and the numerical model MIN3P was used for assessing the effect of biodegradation on source evolution.The diffusive loss to the surrounding vadose zone and the atmosphere created temporary gradients in mole fractions of the individual compounds within the source NAPL.The evolution of the source composition corresponded in general with expectations based on Raoult's Law,with the exception that the mole fractions of aromatic compounds in the source NAPL decreased faster than fractions of aliphatic compounds of similar volatility.Calculation of activity coefficients(gamma)using the UNIFAC model implied nonideal conditions,with composition-dependent gamma's different from 1.Positive deviations were calculated for the aromatic compounds.The effect of biodegradation on source depletion,evaluated by numerical modeling,was greater for the aromatic as compared to the aliphatic compounds.Hence,the faster depletion of the aromatic relative to aliphatic compounds of similar volatility is both a result of the nonideality of the mixture and a result of partitioning and biodegradation in the pore-water.Vapor concentrations of the compounds in the source were in reasonable agreement with predictions based on the modified Raoult's Law with the UNIFAC predicted gamma's and the NAPL composition for the most volatile compounds.For the less volatile compounds,the measured vapor concentrations were lower than predicted with the largest deviations for the least volatile compounds.This field experiment illustrated that nonideal behavior and bioenhanced source depletion need to be considered at multicomponent NAPL spill sites.
机译：在沙质渗流区进行了现场试验，研究了由13种碳氢化合物和示踪剂组成的NAPL燃料源的命运。使用UNIFAC模型测试该源的非理想行为，数值模型MIN3P为用于评估生物降解对来源演变的影响。对周围渗流区和大气的扩散损失在来源NAPL中的单个化合物的摩尔分数上产生了暂时的梯度。来源组成的演变总体上与基于拉乌尔定律（Raoult's Law），不同之处在于源NAPL中芳族化合物的摩尔分数下降速度快于具有类似挥发性的脂族化合物的分数。使用UNIFAC模型计算活度系数（γ）表示非理想条件，与成分有关的γ与1计算出芳香族化合物的正偏差生物降解对源头的影响通过数值模型评估，芳香族化合物比脂肪族化合物具有更大的丰度。因此，相对于挥发性相似的脂肪族化合物而言，芳香族化合物的耗竭更快是由于混合物的不理想性以及分配和源中化合物的蒸气浓度与基于修改后的拉乌尔定律的预测与UNIFAC预测的γ值和最易挥发化合物的NAPL组成的预测合理吻合。对于挥发性较低的化合物，应进行测量现场实验表明，在多组分NAPL泄漏现场应考虑非理想行为和生物增强的源耗竭。

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  • 来源
    《Environmental Science & Technology》 |2005年第21期|p.8251-8263|共13页
  • 作者

    METTE M.BROHOLM; METTE CHRISTOPHERSEN; ULI MAIER; ERLING H.STENBY; PATRICK HOHENER;

  • 作者单位

    Institute of Environment and Resources DTU,Technical University of Denmark,Bygningstorvet B115,DTU,DK-2800 Kgs.Lyngby,Denmark,Center for Applied Geoscience,University of Tubingen,Sigwartstrasse 10,D-72076 Tubingen,Germany,Department of Chemical Engin;

    Institute of Environment and Resources DTU,Technical University of Denmark,Bygningstorvet B115,DTU,DK-2800 Kgs.Lyngby,Denmark,Center for Applied Geoscience,University of Tubingen,Sigwartstrasse 10,D-72076 Tubingen,Germany,Department of Chemical Engin;

    Institute of Environment and Resources DTU,Technical University of Denmark,Bygningstorvet B115,DTU,DK-2800 Kgs.Lyngby,Denmark,Center for Applied Geoscience,University of Tubingen,Sigwartstrasse 10,D-72076 Tubingen,Germany,Department of Chemical Engin;

    Institute of Environment and Resources DTU,Technical University of Denmark,Bygningstorvet B115,DTU,DK-2800 Kgs.Lyngby,Denmark,Center for Applied Geoscience,University of Tubingen,Sigwartstrasse 10,D-72076 Tubingen,Germany,Department of Chemical Engin;

    Institute of Environment and Resources DTU,Technical University of Denmark,Bygningstorvet B115,DTU,DK-2800 Kgs.Lyngby,Denmark,Center for Applied Geoscience,University of Tubingen,Sigwartstrasse 10,D-72076 Tubingen,Germany,Department of Chemical Engin;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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