A Markov process coupled with the Langmuir adsorption isotherm is developed to simulate bisolute adsorption kinetics. Estimates of all model parameters were obtained from a single-solute experiment for the adsorption of 1,1,1-trichloroethane (TCEA) and trichloroethylene (TCE) from dilute aqueous solutions onto granular activated carbon (GAC). The model verifications indicate that the representation of the rate mechanisms are adequate. The solution of the resultant model equations, which are ordinary differential equations, is simpler than the solution of the partial differential equations involved in the deterministic formulations. This model approach can be extended for the modeling of multicomponent adsorption in fixed-beds.

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