Abstract: The characteristic of the o-chlorophenol degradation by pulsed high voltage discharge was investigated in present work.The concentration of o-chlorophenol declined faster by a shortening distance, increasing peak voltage or frequency.A degradation efficiency of 98.7% for o-CP is achieved after degradation for 30 min under the conditions of 2 cm of the electrode distance, 30 kV of the peak voltage and 150 Hz of the frequency.It was found that the discharge form was determined not only by the peak voltage and the electrode distance, but also by the salt content in the solution. The increase in salinity could cause a transition from spark discharge to stream discharge and then to corona discharge. The concentration of o-chlorophenol declined faster in the spark and stream discharge than in the corona discharge. The degradation of o-chlorophenol is attacked by hydroxyl radical to form 2-chloro- hydroguinone.The later is oxidized to 2-chloro-benzoquinone.Therefore, the ring is opened to form simple organic acids such as metacetonic acid, oxalic acid, acetic acid and formic acid.

Key words: 高压脉冲, 液相放电, 邻氯苯酚, 降解

摘要： 研究了高压脉冲液相放电降解水中邻氯苯酚的特性脉冲峰压的升高、电极距离的缩短、脉冲频率的加大均使邻氯苯酚的降解速率增加.在脉冲峰压为30 kV、电极距离为2 cm、脉冲频率为150 Hz条件下，o-CP的降解率约为98.7%.较高输入电压下，溶液初始离子含量的增加，会使放电形式由火花放电→流柱放电→电晕放电转变.在火花放电和流柱放电条件下，邻氯苯酚降解率无明显变化，但在电晕放电时，降解率有所降低.邻氯苯酚受羟基的攻击，生成2-氯-对苯二酚，并进一步被氧化生成2-氯-1,4-对苯醌，2-氯-1,4-对苯醌开环后，进一步被氧化，自由基最终生成丙酸、草酸、乙酸以及甲酸等低分子有机酸.

关键词: 高压脉冲, 液相放电, 邻氯苯酚, 降解