Study Of Contamination Migration Through Soft Bangkok Clay

Diffusion is known to be the main transport mechanism of contaminants in fine-gained soils. To date, it is still common practice to estimate contaminant migration in the Bangkok Clay by means of pure advection models. A series of experiments with various chemical species was performed to determine transport parameters such as the diffusion coefficients and the distribution coefficients. The soil used was saturated undisturbed Soft Bangkok Clay. Column experiments were utilized in a number of laboratory tests involving advective-diffusive migration. Effective diffusion coefficients of different ions were back calculated from the test results. The distribution coefficients were determined from the results of the column tests and batch test. The results indicate that the evaluated parameters are in the range of values obtained from other researchers on similar kinds of soil. Based on this results contaminant migration by diffusion in the Soft Bangkok Clay can now be performed.