| Determination of Diffusion Coefficient and Analysis of Diffusion Factors of Cr（Ⅵ） Ion in Clay Soil |
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| 引用本文： | 杨清雷,张金利,杨庆,唐小微,于永鲜,杨钢.Determination of Diffusion Coefficient and Analysis of Diffusion Factors of Cr（Ⅵ） Ion in Clay Soil[J].天津大学学报(英文版),2011,17(1):51-56. |
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| 作者姓名： | 杨清雷 张金利 杨庆 唐小微 于永鲜 杨钢 |
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| 作者单位： | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering,Dalian University of Technology;School of Chemical Engineering, Dalian University of Technology |
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| 基金项目： | Supported by National Natural Science Foundation of China (No. 50679015). |
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| 摘 要： | Some laboratory diffusion tests were conducted with diffusion device to determine the diffusion coefficient of Cr(Ⅵ) ion passing through Dalian red clay samples. The concentrations of Cr(Ⅵ) at different places of the samples were then measured spectrophotometrically after a standing time of 1 000 d. A one-dimensional solute transport equation was used to simulate the transport of Cr(Ⅵ) through clay samples. Back-calculation of diffusion coefficient of Cr(Ⅵ) was made with finite difference method. Parametric analysis was conducted to simulate variations in soil dry density, temperature, pH and standing time. The results show that the method used in this paper is simple and effective. The diffusion coefficient of Cr(Ⅵ) in Dalian red clay varies from 1.50×10-7 cm2/s to 2.08×10-7 cm2/s. After 1 000 d diffusion, the concentration of the source solution drops down to 1.27 mg/L from 62.5 mg/L, and the diffusion distance is only 3.5 cm. Under the assumption that diffusion coefficient is constant, the diffusion effect becomes more obvious with lower density, lower temperature, higher pH value, and much more time.
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| 关 键 词： | landfill Cr(Ⅵ) ion transport clay soil diffusion coefficient |
Determination of diffusion coefficient and analysis of diffusion factors of Cr(VI) ion in clay soil |
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| Qinglei Yang, Jinli Zhang, Qing Yang, Xiaowei Tang, Yongxian Yu and Gang Yang.Determination of diffusion coefficient and analysis of diffusion factors of Cr(VI) ion in clay soil[J].Transactions of Tianjin University,2011,17(1):51-56. |
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| Authors: | Qinglei Yang Jinli Zhang Qing Yang Xiaowei Tang Yongxian Yu and Gang Yang |
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| Institution: | (2) Dept. Automatics and Biomechanics, Geodevelopment International AB, Lund, Sweden |
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| Abstract: | Some laboratory diffusion tests were conducted with diffusion device to determine the diffusion coefficient of Cr(VI) ion
passing through Dalian red clay samples. The concentrations of Cr(VI) at different places of the samples were then measured
spectrophotometrically after a standing time of 1 000 d. A one-dimensional solute transport equation was used to simulate
the transport of Cr(VI) through clay samples. Back-calculation of diffusion coefficient of Cr(VI) was made with finite difference
method. Parametric analysis was conducted to simulate variations in soil dry density, temperature, pH and standing time. The
results show that the method used in this paper is simple and effective. The diffusion coefficient of Cr(VI) in Dalian red
clay varies from 1.50×10−7 cm2/s to 2.08×10−7 cm2/s. After 1 000 d diffusion, the concentration of the source solution drops down to 1.27 mg/L from 62.5 mg/L, and the diffusion
distance is only 3.5 cm. Under the assumption that diffusion coefficient is constant, the diffusion effect becomes more obvious
with lower density, lower temperature, higher pH value, and much more time. |
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| Keywords: | landfill Cr(Ⅵ) ion transport clay soil diffusion coefficient |
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