Based on the two-film mass transfer theory, a model for SO2 absorption in flue gas with landfill leachate coupled with ammonia desorption was put forward, which includes diffusion and reaction processes, and assumes that thermodynamic equilibrium among the reacting species exists in the bulk liquid. The rigorous numerical approach only requires the definition of individual reactions in the system, and the solution is independent of specific assumptions made, or operational variables. The model was validated using experimental conditions in packed column. The equations in the model could be solved using Maple 8.0 with boundary conditions obtained by rational estimation of the parameters involved. Then the model was used to calculate concentration profiles in the liquid film, partial pressure, mass transfer rate, pH profiles, enhancement factor and individual film resistances along the column. The calculated results were compared to experimental data and a good agreement was achieved.The study provided a basic study for theoretical analysis and engineering design of the process of SO2 absorption into flue gas with landfill leachate coupled with ammonia desorption and other wet FGD process.
