Electrochemical Removal Cyanide in Wastewater by Ti/RuO₂-Pt Electrodes

Abstract:

A laboratory-scale electrolytic cell with a Ti/RuO₂-Pt anode and a Ti cathode was developed to treat high concentration cyanide-contained wastewater. The effects of the different electrode distances, concentration of chlorine anion and current densities, on the CN^- removal were investigated. The results shown the too short and long electrode distance resulted in high energy consumption and low current, the appropriate electrode distance was essential. The CN^- removal was very significant at the electrode distance was 9 cm, and the removal efficiency reached 99.2%. The removal CN^- electrochemical oxidation was mainly attributed the success to in direct oxidation effect of chlorine /hypo-chlorite produced during the electrochemical reaction process. The CN^- removal efficiency increased with increasing the concentration of chloride ion and operating current density. The optimum experimental condition was set at the electrode distance of 9 cm, NaCl dosage of 0.5 g/L, the current density of 10 mA/cm², and pH of 12. At the optimum experimental condition, the CN^- concentration in the solution decreased from 150.33 mg/L to 1.20 mg/L, and the CN^- removal efficiency reached 99.2%.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 2290-2293
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.2290
• Online since: June 2014
• Authors: Chang Hang Wu
• Keywords: Cyanide, Electrochemical Removal, Electrode, Indirect Oxidation

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