摘要
为了满足有机物难生化降解的特殊处理要求,研究建立了多针-板电极形式的高压脉冲放电等离子体体系,以苯酚作目标物,考察该体系中影响苯酚降解的因素并分析了降解产物。结果表明,脉冲放电等离子体体系对苯酚废水的降解效果明显,苯酚降解的中间产物主要有邻苯酚二酚、对苯二酚、对苯醌和间苯二酚;在相同脉冲电压下,电极间距、曝气量和溶液的电导率等因素对苯酚降解效果有影响,溶液初始pH值影响很小;在脉冲电压20kV、脉冲频率50 Hz、电极间距15 mm、pH6.4、电导率10 mS/m、初始质量浓度100 mg/L、水样循环流量100 mL/min的实验条件下,反应体系放电60min对苯酚降解率可达86.2%。
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 100μS/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 highvoltage pulsed discharge plasma.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第2期124-127,共4页
High Voltage Engineering
基金
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)
关键词
脉冲放电等离子体
多针-板电极
苯酚
降解
影响因素
pulsed discharge plasma
multi-needle-to-plate electrode
phenol
degradation
affecting factors
