1998 Volume 23 Issue 5 Pages 229-234
Ion exchange membranes technology for acid and base recovery is reviewed. Diffusion dialysis is advanced for its low investment cost and high recovery of both waste acid and waste base. On the other hand, it has disadvantages of low concentration of recovered liquid and increase of total quantity of liquid. To improve such disadvantage of diffusion dialysis, a combination process of a diffusion dialysis and electrodialysis is proposed. A newly developed hydrogen ion selective membrane enabled an electrodialysis process to recover concentrated acid from acid waste at the same time separating dissolved metal ion from free acid. Regeneration of acid and base with a bipolar membrane electrodialysis is also introduced.
