UV-H_2O_2系统对水中2,4-二氯酚氧化降解研究  

Oxidation and degradation of 2,4-dichlorophenol in water by UV-H_2O_2 system

作　　者：朱琨[1] 王海涛[2] 谢春娟[1] 王恩鹏[1] 

机构地区：[1]兰州交通大学环境工程与科学学院,兰州730070 [2]厦门大学化学及化工学院,福建厦门361005

出　　处：《工业用水与废水》2006年第1期27-31,共5页Industrial Water & Wastewater

基　　金：国家自然科学基金项目(29977015);瑞典政府国际发展署(SIDA)资助项目(20040231)

摘　　要：研究了用UV-H2O2体系对水中2,4-二氯酚氧化降解。结果表明,UV-H2O2体系中H2O2的投加量主要由UV光强度和有机物初始浓度来确定,酸性和中性条件下有利于UV-H2O2体系对2,4-二氯酚的降解;最佳反应温度在20～25℃;UV-H2O2光氧化技术适用于低浊度水的深度处理,降解效果以浊度6 NTU为分界点。在Fenton试验中,向质量浓度为20mg/L的2,4-二氯酚溶液加入2.0mg/L的Fe2+,同时把H2O2的投加量减为0.204mg/L,pH值3.0左右,此时UV-H2O2-Fenton体系对2,4-二氯酚的氧化效率大大提高,比单纯Fenton体系的降解率提高1倍,达到95.6%。用UV-Fenton体系去除有机污染物在效果和经济上均具有明显的优越性。The oxidation and degradation of 2,4-dichlorophenol in water by UV-H2O2 system was studied. The results indicated that, the dosage of H2O2 in UV-H2O2 system mainly depended on the strength of UV radiation and the initial concentration of organic contaminants, acid and neutral conditions were in favor of the degradation of 2,4- dichlorophenol by UV-H2O2 system; the optimal reaction temperature was ranged between 20 - 25 ℃; UV-H2O2 photo-oxidation technology was only available for the advanced treatment of low-turbidity water with a critical limitation of 6 NTU turbidity. In the Fenton experiment, under the condition that, 2.0 mg/L of Fe^2＋ was added into the 2,4-dichlorophenol solution with the mass concentration of 20 mg/L, the dosage of H2O2 decreased to 0.204 mg/ L, the pH value was about 3.0, the efficiency of the UV-H2O2-Fenton system on 2,4-dichlorophenol oxidation was improved greatly; the degradation rate of 2,4-dichlorophenol by the said system was twice higher than by Fenton system only, reached 95.6%. It was proved that UV-Fenton system had obvious superiority both in effect and in economic benefits for removal of the organic contaminants.

关 键 词：紫外光 过氧化氢 2 4-二氯酚 氧化还原 水处理 

分 类 号：X703.1[环境科学与工程—环境工程]