An electrolytic cell was developed at a microscale with copper working electrodes to evaluate the efficiency of the electrodeposition of arsenic as an alternative for recovering this metalloid from the rejection water of capacitive deionization and reverse osmosis processes. Electrodeposits tests were made with a 23 factorial design. Factors included As concentration, pH and current density. Maximum arsenic removal efficiencies of 96.06%, 82.76% and 67.30%> were obtained with synthetic water, and rejection waters of capacitive deionization and reverse osmosis processes, in concentrations of total As 1.0 mg L~(-1),5.0 mg L~(-1) and 0.198 mg L~(-1) respectively. In electrodeposits with maximum As removal, a higher removal of nitrates (70.36%) was observed compared to SO4~(2-) and PO~(3-) anions. Scanning electron microscopy showed the presence of As deposits on the surface of the electrode with synthetic water, while As deposition was not observed in tests with rejection water.
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