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Volume 45 Issue 2
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JIANG Wenhao, LI Jiangshan, HUANG Xiao, HAN Lijun. Analytical model for one-dimensional transport of organic contaminants in multi-layered media considering advection-diffusion-adsorption-degradation[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(2): 262-272. DOI: 10.11779/CJGE20211462
Citation: JIANG Wenhao, LI Jiangshan, HUANG Xiao, HAN Lijun. Analytical model for one-dimensional transport of organic contaminants in multi-layered media considering advection-diffusion-adsorption-degradation[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(2): 262-272. DOI: 10.11779/CJGE20211462
shu

Analytical model for one-dimensional transport of organic contaminants in multi-layered media considering advection-diffusion-adsorption-degradation

  • 1.

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Wuhan 430071, China

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  • Received Date: December 07, 2021
  • Available Online: February 23, 2023
    Graphical Abstract
    • Abstract
  • For the problem of one-dimensional transport of organic contaminants in multi-layered media, a one-dimensional organic contaminants transport model in multi-layered media considering advection-diffusion-adsorption-degradation is established, and the analytical solution for the model is obtained by using the separation variable method. The correctness of the established one-dimensional transport analytical model is verified by comparing the calculated results with those of the existing analytical solution and the numerical method. Based on the established analytical model, the one-dimensional transport process of organic contaminants in a four-layer soil is taken as an example to conduct the parameter analysis. The results show that the advection caused by the leachate head hw will accelerate the transport process and increase the bottom flux. Compared with that at hw of 0.0 m, the bottom flux at 2.0 m can be increased by more than one order of magnitude. The degradation will reduce the concentration and bottom flux. When the transport process reaches the steady state, the bottom flux at degradation half-life t1/2 of 100 a can be reduced by about 45% compared with that at t1/2 of infinity. The increase of the Robin boundary constant α will reduce the concentration in the bottom region, and also will increase the bottom flux, which varies in the same order of magnitude under different α.
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