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The separation of monovalent (Na+, K+) and divalent ions (Ca2+, Mg2+) from binary and ternary mixtures by electrodialysis was compared using various salt combinations (NaCl, NaNO3, KCl, KNO3, K2SO4, Na2SO4, CaCl2, Ca(NO3)2, MgCl2, Mg(NO3)2) at room temperature using a constant flow rate. The efficiencies of each run were evaluated as specific power consumption with the electrical energy consumed only in stack. At 5 V, percent removal of monovalent cations from salt solutions containing monovalent anions (chloride, nitrate) was performed with a higher efficiency than from the salt solutions containing divalent anions (sulfate). When the applied voltage increased to 10 V, the effect of anion charge on percent removal of cations disappeared.

Percent removal of monovalent and divalent ions from binary and ternary mixtures having This study was supported by Ege University Research Foundation (2005 MÜH 034). The authors wish to thank Mr. T. Kobayashi, Toku- yama Corp., Japan, for his efforts in the modification of their standard product and Mr. M. Akcay for spectroscopic analyses. We thank senior student Ms. Arzu Başturk for her help during the experimental study. We acknowledge the useful critics and comments of the referee for the revision of this manuscript.