2023 Volume 18 Issue 4 Pages 381-393
The DF—Kd model considering both adsorption—desorption and intra-particle diffusion in the solid phase has been developed to evaluate solute transport more realistic. Since the applicability of the DF—Kd model has yet to be investigated based on experimental results, the differences between experiments and numerical analysis were discussed. Firstly, a method for obtaining parameters used in the model was established. Herein, partition or diffusion coefficients were obtained against arsenic contamination. Partition coefficients assuming instantaneous equilibrium were obtained at 0.25—0.60 L/kg, while diffusion coefficients in the solid phase on the order of 10-15 to 10-14 m2/s were obtained from serial batch sorption tests. Secondly, the results of batch tests and simulations were compared. When the obtained parameters were applied to the DF—Kd model to simulate the experimental results of batch tests, a relative error of less than 77% was obtained. These results support that the DF—Kd model can reasonably simulate the solute transport on soils more realistic.
