Enhanced electrochemical treatment of copper cyanide wastewater by hydrogen peroxide and peroxymonosulfate
ZHAN Junge1,2,, WANG Hua1,,, ZHANG Feng1,2, ZHAO Shen2, ZHANG Rusan3, LIU Xinbing3, ZHAO Xu2 1.College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China 2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Tianjin Dagang Galvanizing Plant, Tianjin 301800, China
Abstract:Copper and cyanide in the wastewater discharged from surface treatment industry are the difficulties. Electrochemical oxidation is a kind of conventional common approach in water treatment and can effectively treat the common pollutants in water. The hydrogen peroxide (H2O2) and monosulfate (KHSO5, PMS) are the green and clean oxidants. Based on electrooxidation, the strengthening effect of electrochemical treatment of copper and cyanide effluent by H2O2 and PMS was explored. The result showed that the removal rate of cyanide (CN?) and copper ion (Cu2+) increased with the increase of H2O2 and PMS addition. When the current density, H2O2 concentration and reaction time were 10 A·m?2, 0.4 mol·L?1 and 30 min, respectively, the removal rates of cyanide and copper ion is 96.12% and 81.93%, respectively, and the recovery rate of cathode copper reached 75.60%. When the PMS concentration and reaction time were 0.2 mol·L?1 and 30 min, the removal rate of cyanide approximated 100%, the removal rate of copper ion was 94.83%, and the recovery rate of cathode copper reached 93.51%. The above results showed that the addition of suitable reagents could improve the treatment efficiency of copper and cyanide through electrooxidation. Key words:copper cyanide complex/ H2O2/ peroxymonosulfate/ electrochemical oxidation.
图1电流密度对铜氰废水中总氰及总铜去除率的影响 Figure1.Effect of current density on the removal rates of total cyanide and total copper in copper cyanide wastewater
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1.College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China 2.State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Tianjin Dagang Galvanizing Plant, Tianjin 301800, China Received Date: 2021-02-08 Accepted Date: 2021-04-30 Available Online: 2021-07-23 Keywords:copper cyanide complex/ H2O2/ peroxymonosulfate/ electrochemical oxidation Abstract:Copper and cyanide in the wastewater discharged from surface treatment industry are the difficulties. Electrochemical oxidation is a kind of conventional common approach in water treatment and can effectively treat the common pollutants in water. The hydrogen peroxide (H2O2) and monosulfate (KHSO5, PMS) are the green and clean oxidants. Based on electrooxidation, the strengthening effect of electrochemical treatment of copper and cyanide effluent by H2O2 and PMS was explored. The result showed that the removal rate of cyanide (CN?) and copper ion (Cu2+) increased with the increase of H2O2 and PMS addition. When the current density, H2O2 concentration and reaction time were 10 A·m?2, 0.4 mol·L?1 and 30 min, respectively, the removal rates of cyanide and copper ion is 96.12% and 81.93%, respectively, and the recovery rate of cathode copper reached 75.60%. When the PMS concentration and reaction time were 0.2 mol·L?1 and 30 min, the removal rate of cyanide approximated 100%, the removal rate of copper ion was 94.83%, and the recovery rate of cathode copper reached 93.51%. The above results showed that the addition of suitable reagents could improve the treatment efficiency of copper and cyanide through electrooxidation.