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Received October 26, 2016
Accepted July 2, 2017
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Treatment of hydrocyanic galvanic effluent by electrocoagulation: Optimization of operating parameters using statistical techniques and a coupled polarity inverter
1University of Caxias do Sul (UCS), 1130 Francisco Getúlio Vargas st., Caxias do Sul, RS, Brazil 2Laboratory of Corrosion and Surface Protection (LCOR), Brazil
jbirrie@ucs.br
Korean Journal of Chemical Engineering, October 2017, 34(10), 2631-2640(10), 10.1007/s11814-017-0178-y
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Abstract
The treatment of hydrocyanic galvanic effluent with Zn, Ni and Cu ions by electrocoagulation (EC) using aluminum electrodes and a polarity inverter was evaluated. 32 experiments were performed and the optimal operating conditions were obtained using statistical analysis: 30minutes, 5.00 g/L NaCl, 1 cm between electrodes, electrode surface area of 104cm2/L and current density of 8mA/cm2. The results for removal with the polarity inverter were: 99.55% total cyanide, 22.49% total nickel, 52.66% total copper and 100% total zinc. After the EC experiments, localized and general corrosion of the aluminum electrodes was evaluated both internally and externally by SEM. Contaminant removal was confirmed by X-Ray powder diffraction (XRD) and Fourier transform infrared (FT-IR) which demonstrated the presence of contaminants in the galvanic sludge generated in the process.
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