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《High Voltage Engineering》 2007-02
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Degradation of Phenol in Aqueous Solution by High Voltage Pulsed Discharge Plasma

WANG Fangzheng,LI Jie,WU Yan,WANG Huijuan,LI Guofeng(Institute of Electrostatics & Specific Power,Dalian University of Technology,Dalian 116024,China)  
In order to realize the degradation of biorefractory organic compounds in aqueous solutions and to develop some new techniques for wastewater treatment,a multi-needle-to-plate high voltage pulsed discharge plasma system was established in the paper.In the research,phenol was chosen as the target pollutant due to its toxicity for environment and human being,and corresponding degradation rates of phenol under the different experimental conditions as well as the byproducts generated during the process of phenol oxidation were investigated.The obtained results reveal that the degradation efficiency of phenol in the multi-needle-to-plate high voltage pulsed discharge plasma system is high.Many factors,such as electrodes distance,gas bubbling rate and solution electric conductivity,affect the degradation efficiency of phenol in the pulsed discharge plasma system,while the initial solution pH values has little effect on phenol degradation in the pulsed discharge system.The degradation rate of phenol increases with the decrease of solution conductivity and electrode distance,but with the increase of gas bubbling.The main intermediates are formed during phenol decomposition process including pyrocatechol,hydroquinone,1,4-benzoquinone,and little resorcinol.In the case of 100 mL/min solution circulation rate,20 kV peak pulsed voltage,50 Hz pulsed frequency,and 15 mm electrodes distance,the degradation rate of 100 mg/L phenol solution with pH value of 6.4 and electric conductivity of 100 μS/cm reached 86.2% after 60 min treatment.These results provide an experimental foundation for further study on treating toxic organic compound in water or wastewater using the technique of high-voltage pulsed discharge plasma.
【Fund】: 国家自然科学基金项目(20377006);; 高等学校博士学科点专项科研基金项目(2005141002)
【CateGory Index】: X703
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