Kim S B
School of Biological Resources and Materials Engineering, Seoul National University, Seoul 151-742, Korea.
Environ Technol. 2004 Aug;25(8):873-80. doi: 10.1080/09593330.2004.9619380.
Mathematical models were developed in this study based on equilibrium sorption approaches to simulate transport and retardation of organic contaminants such as polycyclic aromatic hydrocarbons in a multi-phase groundwater system. In a model development, the Langmuir or Freundlich sorption isotherms were incorporated into a retardation factor to account for nonlinear sorption of contaminants and colloids on solid matrix. Numerical solutions of model equations were obtained using a fully implicit finite difference method. Simulation results showed that the contaminant retardation factor varied temporally and spatially in a multi-phase system (dissolved phase, solid phase, and two mobile colloidal phases). Simulation also indicated that colloidal concentration and mobility would be key factors in controlling the contaminant transport in a multi-phase system. Sensitivity analysis demonstrated that the models were sensitive to changes of nonlinear isotherm coefficients and equilibrium distribution coefficients.
本研究基于平衡吸附方法建立了数学模型，以模拟多相地下水系统中有机污染物（如多环芳烃）的迁移和阻滞。在模型开发过程中，将朗缪尔或弗伦德里希吸附等温线纳入阻滞因子，以考虑污染物和胶体在固体基质上的非线性吸附。使用全隐式有限差分法获得模型方程的数值解。模拟结果表明，在多相系统（溶解相、固相和两个可移动胶体相）中，污染物阻滞因子随时间和空间变化。模拟还表明，胶体浓度和迁移率将是控制多相系统中污染物迁移的关键因素。敏感性分析表明，模型对非线性等温线系数和平衡分配系数的变化敏感。
