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Membrane Water Treatment Volume 11, Number 3, May 2020 , pages 217-222 DOI: https://doi.org/10.12989/mwt.2020.11.3.217 |
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Operational conditions of electrochemical oxidation process for removal of cyanide (CN-) in real plating wastewater |
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Xin Zhao, Minsik Jang, Jin Woo Cho and Jae Woo Lee
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| Abstract | ||
| An electrochemical oxidation process was applied to remove cyanide (CN-) from real plating wastewater. CN- removal efficiencies were investigated under various operating factors: current density and electrolyte concentration. Electrolyte concentration positively affected the removal of both CN- and Chemical Oxygen Demand (COD). As the electrolyte concentration increased from 302 to 2,077 mg Cl-/L, removal efficiency of CN- and COD increased from 49.07% to 98.30% and from 23.53% to 49.50%, respectively, at 10 mA/cm2. Current density affected the removal efficiency in a different way. As current density increased at a fixed electrolyte concentration, CN- removal efficiency increased while COD removal efficiency decreased, this is probably due to lowered current efficiency caused by water electrolysis. | ||
| Key Words | ||
| electrochemical oxidation; cyanide; current density; electrolyte | ||
| Address | ||
| Xin Zhao, Minsik Jang and Jae Woo Lee: Department of Environmental Engineering, college of Science and Technology, Korea University, Republic of Korea Jin Woo Cho: Department of Environmental, Energy & Geoinformatics, college of Engineering, Sejong University, Republic of Korea | ||
