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Modeling volatilization of residual VOCs in unsaturated zones: A moving boundary problem

机译：模拟非饱和区中残留VOC的挥发：运动边界问题

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摘要

It is of practical interest to investigate the natural evaporation of volatile organic compounds (VOCs) after the removal of a leaking tank situated on the top of the soil. This study aims to develop a mathematical model to predict mole fraction distributions and migration of evaporation front for two VOCs emanating from residual non-aqueous phase liquid (NAPL) due to the leak from the tank in a homogeneous soil. Considering the location of the front and the regions above and below the front, a numerical model for the diffusive transport of VOCs in unsaturated soils was developed using the finite difference method with a moving grid approach. The model was further simplified to the case of single VOC and solved analytically by Boltzmann's transformation with a moving boundary. Analytical expressions for the depth and moving speed of the front for a single VOC were then obtained for practical use. Finally, the developed model was used to predict the concentration distributions of VOCs below the land surface and examine the factors affecting the location and moving speed of the evaporation front.
机译：拆除位于土壤顶部的泄漏箱后，研究挥发性有机化合物（VOC）的自然蒸发是具有实际意义的。这项研究旨在建立一个数学模型，以预测由于均质土壤中储罐泄漏造成的残留非水相液体（NAPL）产生的两种VOC的摩尔分数分布和蒸发锋面迁移。考虑到前缘的位置以及前缘上下的区域，采用移动网格法的有限差分法建立了VOCs在非饱和土壤中扩散扩散的数值模型。该模型被进一步简化为单一VOC的情况，并通过具有移动边界的Boltzmann变换进行了解析求解。然后获得了单个VOC的前端深度和移动速度的解析表达式，以供实际使用。最后，利用开发的模型预测了地表以下挥发性有机化合物的浓度分布，并研究了影响蒸发锋面位置和移动速度的因素。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第15期|p.231-239|共9页
  • 作者

    Talib R. Abbas; Jung-Hau Yu; Chiu-Shia Fen; Hund-Der Yeh; Li-Ming Yeh;

  • 作者单位

    Water Treatment Technology Directorate, Ministry of Science and Technology, Baghdad, Iraq;

    Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan;

    Department of Environmental Engineering and Science, Feng Chia University, Taichung, Taiwan;

    Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, Taiwan;

    Department of Applied Mathematics, National Chiao Tung University, Hsinchu, Taiwan;

  • 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
  • 关键词

    analytical solution; finite difference model; NAPL; vadose zone; VOC;

    机译：分析溶液;有限差分模型NAPL;渗流区;挥发性有机物;

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