employee
Russian Federation
employee
Russian Federation
In production processes, solutions are formed, which must be purified and concentrated for their subsequent use for industrial purposes. To perform these technological operations, the possibilities of using nanofiltration separation are being considered, where semi-permeable membranes capable of sorbing metal ions contained in industrial solutions are used. The aim of the work was to perform experimental studies of the sorption capacity of OPMN-P, OFAM-K and AMN-P nanofiltration membranes in industrial solutions containing metal ions of iron, zinc, nickel, cadmium, copper and manganese. The results of experimental studies and calculated values for evaluating the sorption efficiency of nanofiltration membranes of the OPMN-P, OFAM-K and AMN-P types when removing metal ions of different concentrations from industrial wastewater solutions are presented. The results of the sorption tank analysis showed the heterogeneous behavior of the membranes relative to different metal ions. Among the studied samples, the OPMN-P membrane showed the highest efficiency of purification from metal cations compared to the OPAM-K and AMN-P membranes. The maximum extraction of ions was achieved for manganese on the OPMN-P and AMN-P membranes, while the best removal of copper ions was observed on the OPAM-K membrane. The distribution coefficients of metal ions are calculated according to the Freundlich equation, and specific empirical coefficients for each membrane and ion type are determined, which makes it possible to predict the distribution of ions of other metals. The difference between theoretical calculations and experimental data is less than 6% in the vast majority of cases, which confirms the accuracy of the selected computational models and the validity of the mechanisms used to describe the sorption process.
NANOFILTRATION MEMBRANES, METAL IONS, CONCENTRATION OF SOLUTIONS, PARTITION COEFFICIENT, FREUNDLICH EQUATION
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