污染土壤淋洗液中六氯苯的电化学法处理研究

采用电化学稳定性较好的钛基镀RuO2为阳极,以不锈钢板为阴极,对污染土壤淋洗液中的六氯苯进行电化学处理,研究了溶液初始pH值、HCB初始浓度、电解时间、电解质浓度、外加电压等因素对六氯苯处理效果的影响。所得最佳工艺条件为:用TX-100做增溶剂时,在HCB初始浓度300μg/L、溶液初始pH为3,电解质浓度为1%,外加电压为6V时,电解3hHCB去除率为60.3%。气相色谱分析表明:阴极还原脱氯是HCB电化学降解的主要途径,检出的降解产物有五氯苯、1,2,4,5-四氯苯和1,2,3,4-四氯苯。

Electrochemical Treatment of Hexachlorobenzene in Effluent of Contaminated Soil Washing

Hexachlorobenzene (HCB) in effluent of contaminated soil washing was treated by electrochemical method, with RuO2/Ti as anode and steel electrode as cathode. Effects of initial pH, HCB concentration, electrolysis time, concentration of electrolyte and voltage on removal of HCB were investigated. Results showed that removal of HCB reached 60.3% after 3h with initial HCB concentration 300μg/L, concentration of electrolyte 1%, voltage 6V and TX-100 as solubilizing agents.Detection of degradation products including perchlorobenzene (PeCB), 1,2,4,5-tetrachlorobenzene (1,2,4,5-TetCB) and 1,2,3,4-tetrachlorobenzene (1,2,3,4-TetCB) proved that degradation mechanism is cathodic reduction dechlorination of HCB during the electrochemical process.