Mother liquid discharged from a salt-manufacturing plant was electrodialyzed at 25 and 40 o C in a continuous process integrated with SO 4 2ion low-permeable anion-exchange membranes to remove Na 2 SO 4 and recover NaCl in the mother liquid. Performance of electrodialysis was evaluated by measuring ion concentration in a concentrated solution, permselectivity coefficient of SO 4 2ions against Clions, current efficiency, cell voltage, energy consumption to obtain one ton of NaCl and membrane pair characteristics. The permselectivity coefficient of SO 4 2ions against Clions was low enough particularly at 40 o C and SO 4 2transport across anion-exchange membranes was prevented successfully. Applying the overall mass transport equation, Clion and SO 4 2ion transport across anion-exchange membranes is evaluated. SO 4 2ion transport number is decreased due to the decrease of electro-migration of SO 4 2ions across the anion-exchange membranes. SO 4 2ion concentration in desalting cells becomes higher than that in concentration cells and SO 4 2ion diffusion is accelerated across the anion-exchange membranes from desalting cells toward concentrating cells.
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