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Home > Archive>Volume 48, Issue 01, 2020 >24-32. DOI:10.11908/j.issn.0253-374x.19093
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Numerical Analysis of Vertical Migration of Dense Nonaqueous-phase Liquids in Saturated Clay
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    Abstract:

    An analytical module based on the COMSOL Multiphysics software was developed to consider the effects of two-phase flow and convective dispersion. Using chlorobenzen as the material and choosing typical parameter values, the numerical analysis of vertical migration of DNAPL in homogeneous saturated clay was conducted. The convective diffusion analysis shows that the migration speed of the dissolved DNAPL by molecular diffusion is very slow，only about several centimeter per year. The DNAPL - water two-phase flow coupled convective diffusion analysis indicates that for saturated cohesive soil with a larger permeability coefficient (k=1×10-6 cm?s-1), The DNAPL migration velocity caused by the two-phase flow is large, about tens of centimeters per year. The dissolution of liquid DNAPL leads to the concentration of dissolved DNAPL in pore-liquid quickly and achieves solubility. These results suggest that two - phase flow is likely to be the main mechanism for the deep migration of DNAPL in saturated clay observed in some sites.

    Reference
    Fetter C W. Contaminant hydrogeology[M]. New York: Macmillan Publishing Company, 1992.
    胡黎明, 劳敏慈, 濮家骝,等. LNPALs在非饱和土中迁移的离心试验模拟[J]. 岩土工程学报, 2002, 24(6):690-694.
    胡黎明, 邢巍巍, 吴照群,等. 多孔介质中非水相流体运移的数值模拟[J]. 岩土力学, 2007, 28(5):951-955.
    施小清, 吴吉春, 刘德朋,等. 饱和介质中重非水相液体运移的数值模拟及敏感性分析[J]. 南京大学学报(自然科学), 2011, 47(3):299-307.
    Essaid H I, Bekins B A, Cozzarelli I M. Organic contaminant transport and fate in the subsurface: Evolution of knowledge and understanding[J]. Water Resources Research, 2015, 51(7):4861-4902.
    O''Hara S K, Parker B L, J?rgensen P R, et al. Trichloroethene DNAPL flow and mass distribution in naturally fractured clay: Evidence of aperture variability[J]. Water Resources Research, 2000, 36(1):135–147.
    Parker B L, Cherry J A, Chapman S W. Field study of TCE diffusion profiles below DNAPL to assess aquitard integrity[J]. Journal of Contaminant Hydrology, 2004, 74(1-4):197-230.
    [8]余梅. 氯苯类化合物在低渗透黏性土介质中的迁移规律研究[D].武汉：中国地质大学(武汉), 2016.
    [9]Bowman C W, Ward D M, Johnson A I, O. Trans, Mass transfer from fluid and solid spheres at low Reynolds numbers, Can. J.Chem. Eng. 1961.9–13.
    [10]Wakao N, Kagei S D. Heat and mass transfer in packed beds[J]. Aiche Journal, 1982, 1(2):193-199.
    [11]Miller C T, Poiriermcneill M M, Mayer A S. Dissolution of trapped nonaqueous phase liquids: mass transfer characteristics.[J]. Water Resources Research, 1990, 26(11):2783-2796.
    [12]Parker J C, Lenhard R J, and Kuppusamy T. A parametric model for constitutive properties governing multiphase flow in porous media. Water Resour. Res. 1987.23 (4), 618–624.
    [13]van Genuchten, M.Th. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc.Am. J., 1980, 44, 892–898.
    [14]Mualem, Y. A new model for predicting the hydraulic conductivity of unsaturated porous media. Water Resources Research, 1976, 12, 513–522.
    [15]上海市场地环境健康风险评估筛选值. 2015, 上海市环境保护局.
    [16]Lu N, Likos W J. Unsaturated soil mechanics[M]. J. Wiley, 2004.
    Bowman C W, Ward D M, Johnson A I, O. Trans, Mass transfer from fluid and solid spheres at low Reynolds numbers, Can. J.Chem. Eng. 1961.9–13.
    Wakao N, Kagei S D. Heat and mass transfer in packed beds[J]. Aiche Journal, 1982, 1(2):193-199.
    Miller C T, Poiriermcneill M M, Mayer A S. Dissolution of trapped nonaqueous phase liquids: mass transfer characteristics.[J]. Water Resources Research, 1990, 26(11):2783-2796.
    [20]Mott H V, Weber Jr W J. Factors influencing organic contaminant diffusivities in soil-bentonite cutoff barriers[J]. Environmental Science Technology, 1991, v. 25(10):1708-1715.
    [21]Barone F S, Rowe R K, Quigley R M. A laboratory estimation of diffusion and adsorption coefficients for several volatile organics in a natural clayey soil[J]. Journal of Contaminant Hydrology, 1992, 10(3):225-250.
    [22]Myrand D, Gillham R W, Sudicky E A, et al. Diffusion of volatile organic compounds in natural clay deposits: Laboratory tests[J]. Journal of Contaminant Hydrology, 1992, 10(2):159-177.
    [23]Lenczewski M, Mckay L, Pitner A, et al. Pure-phase transport and dissolution of TCE in sedimentary rock saprolite[J]. Ground Water, 2006, 44(3):406-414.
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GAO Yanbin, ZHANG Songbo, LI Tao, SHEN Chao. Numerical Analysis of Vertical Migration of Dense Nonaqueous-phase Liquids in Saturated Clay[J].同济大学学报(自然科学版),2020,48(01):24~32

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History
  • Received:March 17,2019
  • Revised:November 20,2019
  • Adopted:October 09,2019
  • Online: January 20,2020
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