Fe/Cu催化还原去除饮用水消毒副产物三氯乙酸  

Removal of Halogenated Disinfection By-products Trichloroacetic Acid by Fe/Cu Catalytic Reduction in Drinking Water

作　　者：楚文海[1] 高乃云[1] 赵世嘏[1] 董秉直[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2009年第10期1355-1359,共5页Journal of Tongji University:Natural Science

基　　金：国家科技重大专项资助项目(2008ZX07421-002);国家"十一五"科技支撑计划资助项目(2006BAJ08B06);上海市科委资助项目(072312001;08230707000)

摘　　要：以高致癌风险的饮用水卤化消毒副产物(halogenated disinfection by-products,HDBPs)三氯乙酸(TCAA)为去除目标物,研究了Fe/Cu催化还原去除TCAA的效果,包括Fe/Cu质量比、Fe/Cu混合物投加量、pH值、有机物浓度和摇床转速等因素对Fe/Cu催化还原去除TCAA的影响.结果表明,Fe/Cu能够有效脱除TCAA,m(Fe)∶m(Cu)为10∶1时的TCAA去除效果最佳;Fe/Cu最佳投加量为30 g.L-1;Fe/Cu还原脱氯去除TCAA最佳pH值在4～8之间;有机物浓度对Fe/Cu还原脱氯存在负面影响;在摇床转速、反应时间、投加量、pH值和UV254分别为200 r.min-1,160min,30 g.L-1,6.82和0.117 cm-1的条件下,Fe/Cu催化还原对TCAA的去除率达到97.39%,并且Cu未被消耗,外扩散Fe/Cu催化还原反应的影响可以忽略,Fe/Cu对TCAA的催化还原脱氯降解过程符合拟一级反应.Trichloroacetic acid（TCAA）which has relatively high concentration and carcinogenic risk,one of the most common disinfection by-products（DBPs）in drinking water,seriously endangers the physical health of mankind and eco-environment.Zero-valent iron（ZVI）reductive process is used in water treatment extensively for the removal of THMs by ZVI.However,little information is available on the removal of TCAA by low-cost Fe/Cu catalytic reduction technology.Some factors affecting the removal of TCAA by Fe/Cu catalytic reduction in a negative way. 97. 39% of TCAA can be effectively removed by Fe/Cu catalytic reduction on the condition that the rotate speed of shaker is 200 r·min^-1 , the reaction time 160 min,Fe/Cu dosage 30 g·L^-1, pH 6.82 and UV254 0. 117 cm^-1. The influence of external diffusion on Fe/ Cu catalytic reductive reaction may be neglected. The degradation process of TCAA by Fe/Cu catalytic reduction is consistent with pseudo first order reaction.

关 键 词：铁/铜催化还原 卤化消毒副产物 三氯乙酸 饮用水 

分 类 号：X703[环境科学与工程—环境工程] TU991.2[建筑科学—市政工程]