A stochastic model is proposed to calculate efficiency indices for the treatment of liquid mixtures by electrodialysis using methods of queuing theory. Electrodialysis demineralization of an ammonium sulfate solution is experimentally studied. Comparison between the experimental and theoretical data confirms the validity of the model.

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The results of the thermal modification of AG OV 1 and SKD 515 activated carbons under varied conditions (by atmospheric oxygen and in an atmosphere of nitrogen) are reported. It was determined that, on the thermal oxidation under selected conditions, the formation of surface oxygen compounds predomi nated over the process of their destruction. Upon thermal treatment in an inert atmosphere, oxygen contain ing acid type groups were removed from the surface of activated carbons or converted into pyrone (basic) and ether structures. It was shown that a change in the porous structure and the surface functional group compo sition of the activated carbons depends on not only the conditions of modification but also the properties of the initial carbon adsorbents. Heating in an atmosphere of air led to an increase in the adsorption of both ben zene and water vapors, whereas the heat treatment of activated carbons in the inert atmosphere increased the adsorption of only the nonpolar compound (benzene).