Abstract
Studies on electrodialysis concentration/desalination of concentrated salt solutions (NaCl) as a model of soft highly mineralized liquid waste have been carried out. The apparatus of the EMA line manufactured by JSC «Membranines Technologijos LT» were used as electro-membrane devices. Apparatus are distinguished by reliable operation in concentrated mineral solutions under high currents. IONSEP-HC/MC ion-selective cation- and anion-exchange membranes intended for work with highly mineralized sewage was used. Studies have shown the possibility of utilization of concentrated electrolyte solutions, as models of highly mineralized VPU waste with high efficiency. To a residual electrolyte concentration in dialysate at a level of 0.2-0.25 g/l, the unit cost of electricity for salt transfer is approximately 1 kWh/kg, the desalination ratio is 100-150. When the concentration of electrolyte in dialysate is less than 0.1 g/l, the process practically stops due to the increasing influence of the reverse diffusional salt transfer. The calculated maximum salt (NaCl) concentration in the concentrate is 15-16 mass. %
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