Abstract
The processes of electrodialysis and diffusion dialysis were tested to recover water and acid from model solutions containing hydrochloric acid and ferric ions. The electrodialysis process was run with domestic ion-exchange membranes of AESD-2a and KESD-2 type. Dialysis was conducted with anion-selective Selemion AMV (Asahi Glass) membranes. Electrodialysis yielded acid removal of 93 to 96% at current densities ranging from 100 to 300 A/m 2 and an energy consumption approaching 50 Wh/val H +. Diffusion dialysis provided acid removal of 56 to 67% and 38 to 46% at a volume of ratios of 4/40 and 4/6, respectively. The experiments were carried out for 10 days. The retention of ferric ions was very high throughout amounting to 98–99%.
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