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Ethylenediaminetetraacetic acid (EDTA) forms a stable complex with copper. Electrodialysis treatment accompanied by electrochemical reaction was studied for the regeneration of EDTA and Cu from a solution of the complex. The electrodialysis stack consisted of three units of two cells containing cathode and anode compartments, and bipolar electrodes set between the units. The cells in a unit were separated by a cation-exchange membrane. Electrochemical reactions for the regeneration of EDTA and Cu were successfully achieved by electrodialysis with one unit in a stack. Both the rate of EDTA-Cu disappearance and the rate of EDTA formation were almost proportional to the current density. The Cu deposition on the cathode also proceeded well. Experiments were also conducted using electrodialysis with bipolar electrodes in a stack, and the rates of EDTA formation and EDTA-Cu disappearance were faster than those for the single unit experiments, and increased with the current density. The current efficiency of the electrochemical reaction on the cathode was close to 100%, and the current leakage from the bipolar electrode in the stack was negligibly small under the conditions employed. The results suggest that electrodialysis with bipolar electrodes enables the effective regeneration of Cu and EDTA from a solution of the complex. All the experimental results were analyzed using a mathematical model that considered electrochemical reaction on the cathode, ionic flux in the cation-exchange membrane, and the material balances of EDTA, EDTA-Cu, and sodium. The simulated results were in good agreement with the experimental results.

Recovery of Cu and EDTA from EDTA-Cu Solution by use of Electrodialysis Accompanied by Electrochemical Reaction