Electrodialyzed compositions and method of treating aqueous solutions using electrodialysis

摘要

Disclosed is an electrodialysed composition suitable for human consumption, the composition comprising a total cation (or total anion) concentration of 1.0N or less, individual cation (or individual anion) concentration of 0.6N or less, a free chlorine content of 1 ppm or less, and a pH of 5.0 or less. Also disclosed is the preparation of the electrodialysed composition by a method comprising: contacting an aqueous solution having a total anion or total cation concentration of 1.8N or less with a membrane electrodialysis system, the membrane electrodialysis system including at least one bipolar membrane in between a plurality of cationic membranes or a plurality of anionic membranes, all of the membranes being disposed between a cathode electrode and an anode electrode; applying an electrical potential across the anode and cathode for a time effective for changing the pH of the aqueous solution by at least 2.0 and providing an electrodialysed composition comprising a total cation (or total anion) concentration of 1.0N or less, individual cation (or individual anion) concentration of 0.6N or less, a free chlorine content of 1 ppm or less.