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首页> 外文期刊>Water, Air, and Soil Pollution >Mathematical Modeling of Differentiation Processes in Porous Media During Soil Vapor Extraction (SVE) Remediation of Contaminated Soil/Water
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Mathematical Modeling of Differentiation Processes in Porous Media During Soil Vapor Extraction (SVE) Remediation of Contaminated Soil/Water

机译：土壤蒸汽提取（SVE）修复被污染土壤/水过程中多孔介质分化过程的数学模型

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摘要

Soil vapor extraction (SVE) is one of the most effective remediation technologies for soil and groundwater contamination. Soil particles can be mobilized by air perturbation during SVE, resulting in the differentiation of porous media, which has not been well addressed. This paper developed a numerical method to study the flow pattern and quantify the change of porous media for the first time. Based on the mass equilibrium and Darcy's law, a two-phase water-air flow model was constructed with integration of saturation, relative permeability, and capillary pressure during SVE. Relationship between porosity and saturation was deduced and coupled with the two-phase flow model for quantifying change of porous media in real time. Results reveal that both porosity and permeability increase sharply in the early stage of SVE then gradually to a quasi-steady state. These increases in vadose zone tapered off with distance from the SVE screen and the steady period occurred later as well. The influence radius of a single SVE well and the change degree in porosity and permeability of media were proportional to the extraction vacuum and the driving coefficient C, which is more sensitive than extraction vacuum according to the simulation results. Knowledge from this modeling exercise provides a useful tool to estimate the change of remediated zone and assess the environmental risk of remedial activities at real-world contamination sites.
机译：土壤蒸气提取（SVE）是针对土壤和地下水污染的最有效补救技术之一。在SVE过程中，土壤颗粒可以通过空气扰动而动员，导致多孔介质的分化，这一点尚未得到很好的解决。本文首次开发了一种数值方法来研究流动模式并量化多孔介质的变化。基于质量平衡和达西定律，建立了一个两相水-空气流模型，该模型综合了SVE过程中的饱和度，相对渗透率和毛细压力。推导了孔隙度与饱和度之间的关系，并结合两相流模型实时定量分析了多孔介质的变化。结果表明，孔隙度和渗透率在SVE的早期都急剧增加，然后逐渐达到准稳态。渗流区的增加随距SVE筛的距离逐渐减小，并且稳定期也随后出现。单个SVE井的影响半径与介质孔隙度和渗透率的变化程度与抽真空和驱动系数C成正比，根据模拟结果，该系数比抽真空更敏感。该建模练习中的知识提供了一个有用的工具，可以估算补救区域的变化并评估实际污染现场补救活动的环境风险。

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  • 来源
    《Water, Air, and Soil Pollution》 |2013年第4期|8.1-8.8|共8页
  • 作者

    Ying Lu; Wei Fan; Y. S. Yang; X. Q. Du; G. X. Zhang;

  • 作者单位

    Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, People's Republic of China;

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;

    Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, People's Republic of China,School of Earth and Ocean Sciences, Cardiff University, Cardiff CF103 YE, UK;

    Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, People's Republic of China;

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    particles migration; soil vapor extraction; two-phase flow; porous media; mathematical modeling;

    机译：颗粒迁移;土壤蒸气提取;两相流多孔介质数学建模;

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