高压电晕放电对五氯酚的降解研究  

Study on Degradation of Pentachlorophenol by High-Voltage Corona

作　　者：任大军[1] 张元元[1] 张莉[1] 许琴[1] 吴高明[2] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]武汉钢铁(集团)公司,湖北武汉430083

出　　处：《环境保护科学》2014年第2期14-17,89,共5页Environmental Protection Science

基　　金：国家支撑计划项目(2012BAC02B04);湖北省教育厅基金项目(NO.B20071107)资助

摘　　要：研究了放电电压、溶液pH等因素对高压电晕放电降解PCP效果的影响,并对高压电晕放电处理PCP的动力学进行了初步探讨,同时对高压电晕放电降解PCP的COD和TOC的变化进行了分析。结果表明:放电电压和溶液pH值对PCP降解性能影响很大,放电电压和溶液pH值越高,PCP的降解速度越快。当溶液pH值为11.2、PCP初始质量浓度40 mg/L、电晕放电电压为25 kV时,经30 min电晕放电,PCP的降解率达90%以上,电晕放电降解PCP的反应符合一级反应动力学。在氧化过程中PCP可能转化为苯醌等中间产物,TOC几乎无变化,PCP分解成的小分子有机物使COD升高,可生化性提高。The influences of discharge voltage and solution pH on PCP degradation by high-volatage corona were researched,and the kinetics of PCP degradation was discussed.At the same time,the changes of COD and TOC in PCP degradation process by corona were also investigated.The results indicated that the pH values and the discharge voltage had great influences on the oxidation.The higher the discharge voltage and solution pH values,the faster the degradation of PCP.When the solution pH value was 11.2,and the PCP initial concentration was 40mg/L and corona discharge voltage was 25 kV,PCP degradation rate was more than 90% after 30min.Corona discharge degradation of PCP followed the first order reaction kinetics.In the oxidation process,PCP might translate into the middle production of benzoquinone and TOC had no change.Small molecule organics from PCP degradation made COD increase to improve the biodegradability.

关 键 词：电晕放电 五氯酚 臭氧 自由基 

分 类 号：X703[环境科学与工程—环境工程]