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Issue
Korean Journal of Chemical Engineering,
Vol.34, No.10, 2631-2640, 2017
Treatment of hydrocyanic galvanic effluent by electrocoagulation: Optimization of operating parameters using statistical techniques and a coupled polarity inverter
Pertile TS, Birriel EJ
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.
Keywords: Aluminum Electrodes; Electrocoagulation; Electrolysis; Hydrocyanic Galvanic Effluent; Polarity Inverter
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