Abstract： The solution-diffusion model was used to predict the behavior of reverse osmosis membrane,when used for the removal of cobalt from radioactive wastewater.System mass balances together with solutiondiffusionmass transfer models were used to simulate the separation process of low concentrations of cobalt.Model equation constants were obtained when the cobalt concentration was high, and  the experimental data were then compared with simulated data when the cobalt concentration was low. The results show that the relative error between experimental data and simulated data does not exceed 15%. Good agreement between the experimental and the predicted cobalt concentrations suggests that the solutiondiffusion model can be used to well predict osmotic concentration even when the concentration of cobalt is low.
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