| Degradation of chlorophenol by in-situ electrochemically generated oxidant |
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| 作者姓名： | 丛燕青 吴祖成 叶倩 谭天恩 |
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| 作者单位： | Department of Environmental Engineering，Zhejiang University，Hangzhou 310027，China，Department of Environmental Engineering，Zhejiang University，Hangzhou 310027，China，Department of Environmental Engineering，Zhejiang University，Hangzhou 310027，China，Department of Environmental Engineering，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project supported partially by the Hi-Tech Research and Devel-opment Program (863) of China (No. 2002AA529182) and the Foundation of Education Ministry of China (No. 98679) andZhejiang Provincial Natural Science Foundation of China (No. 200043) |
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| 摘 要： | INTRODUCTION With the development of industry, more and more pollutants are discharged into environment, among them, phenolic wastes are typical contami-nants considered to be hazardous and top priority toxic pollutants listed by the USEPA. They are toxic even at low concentration. Due to their biorefractory, bioaccumulation and carcinogenic potential, the treatment of these contaminants is very important in environmental protection. Various technologies and processes have been tried …
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Degradation of chlorophenol by in-situ electrochemically generated oxidant |
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| CONG Yan-qing,WU Zu-cheng YE Qian,TAN Tian-en.Degradation of chlorophenol by in-situ electrochemically generated oxidant[J].Journal of Zhejiang University Science,2004(2). |
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| Authors: | CONG Yan-qing WU Zu-cheng YE Qian TAN Tian-en |
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| Abstract: | A novel in-situ electrochemical oxidation method was applied to the degradation of wastewater containing chlorophenol. Under oxygen sparging, the strong oxidant, hydrogen dioxide, could be in-situ generated through the reduction of oxygen on the surface of the cathode. The removal rate of chlorophenol could be increased 149% when oxygen was induced in the electrochemical cell. The promotion factor was estimated to be about 82.63% according to the pseudo-first-order reaction rate constant (min-1). Important operating parameters such as current density, sparged oxygen rate were investigated. Higher sparged oxygen rate could improve the degradation of chlorophenol. To make full use of oxygen, however, sparged oxygen rate of 0.05 m3/h was adopted in this work. Oxidation-reduction potential could remarkably affect the generation of hydrogen peroxide. It was found that the removal rate of chlorophenol was not in direct proportion to the applied current density. The optimum current density was 3.5 mA/cm2 when initial chlorophenol concentration was 100 mg/L and sparged oxygen rate was 0.05 m3/h. |
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| Keywords: | In-situ electrochemical oxidation Chlorophenol Oxygen Hydrogen peroxide |
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