Studies on the migration laws of organic pollutants in three-phase medium of contaminated soil

作者：Li Jiang Shan^*; Lu Hai Jun

来源：Electronic Journal of Geotechnical Engineering, 2011, 16 J: 1031-1042.

• Carbon partition coefficients
• Concentration distributions
• Contaminated soils
• Dynamic equilibria
• Environmental assessment
• Environmental risks
• Henry's law
• Henry's Law constant
• Influence mechanism
• Main parameters
• Migration laws
• Numerical modeling
• Oncentration distribution
• Sensitivity
• Simulation result
• Theoretical basis
• Time effect
• Vadose Zone

Migration of contaminants in soil is a dynamic equilibrium process, based on the equations of concentration distribution of organic pollutants, a dynamic model about organic pollutants releasing and transferring in vadose zone was established in this paper, taking benzene for example, numerical modeling the migration laws, concentration distribution laws of benzene in the three-phase medium of soil, and also the influence mechanism of the main parameters was studied. Simulation results showed that benzene- contaminated soil existed a great environmental risk, concentration distribution laws of benzene in the three-phase medium of soil was similar changing with time. Organic carbon partition coefficient and Henry's law constant of benzene both posed a great influence on its migration and transformation in soil, the amount of benzene adsorbed on soil increased as organic carbon partition coefficient increased, but decreased in other two phases, the effect of Henry's law on concentration distribution of benzene showed a significant time effect. Results can provide a theoretical basis for environmental assessment of contaminated soil and pollution control.

• 出版日期2011