Efficiency of Electromembrane Purification of Technological Solutions from Heavy Metal Cations

The work possibilities of practical and theoretical application of the electromembrane method in the process of purifying process waters from heavy metal cations are investigated. The objects of research are considered – these are technological solutions containing iron and nickel cations and semi-permeable polymer membranes with various selectively permeable characteristics. The influence of transmembrane parameters of the electromembrane separation process on the main kinetic characteristics of MGA-95P and OPM-K membranes during the purification of process waters in metalworking production has been studied. An analysis of the influence of transmembrane parameters on the kinetic dependence of the retention coefficient on the output specific flux on semi-permeable cellulose acetate and polyamide membranes is presented. Approximation expressions are obtained for the theoretical calculation of the retention coefficient depending on the physicochemical basis of the polymer of the semipermeable membrane, the transmembrane pressure, the concentration and temperature of the process solution. Numerical values of empirical coefficients have been determined that make it possible to calculate and predict the values of the retention coefficient, which can be used in the design of laboratory, pilot and industrial installations used in production processes for the separation, purification and concentration of technological and waste waters.