臭氧强化电絮凝处理直接耐晒大红4BS模拟染料废水  

Ozonation-enhanced electrocoagulation for removal of C.I.Direct Red 23 in aqueous solution

作　　者：何志桥[1] 裘建平[1] 宋爽[1] 陈建孟[1] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310032

出　　处：《化工学报》2007年第10期2573-2579,共7页CIESC Journal

基　　金：国家自然科学基金项目(50408024);浙江省自然科学基金项目(Y505036)~~

摘　　要：采用臭氧强化电絮凝法处理直接耐晒大红4BS模拟染料废水,研究了染料脱色的影响因素及其CODCr去除动力学。考察了电流密度、溶液初始pH值、染料初始浓度、支持电解质浓度、反应温度和臭氧流量对臭氧强化电絮凝法处理4BS染料脱色效率的影响。结果表明,电流密度15mA.cm-2,pH值10.0,4BS染料初始浓度100mg·L-1,支持电解质浓度3000mg·L-1,臭氧流量0.6L·h-1,20℃下反应50min后4BS脱色率达94%以上。CODCr去除符合拟二级动力学。The removal of C.I. Direct Red 23 （4BS） in aqueous solution with ozonation-enhanced electrocoagulation was investigated by laboratory-scale experiments. Operation parameters were optimized based on the decolorization efficiency of 4BS. Analysis of 4BS in aqueous solution was performed by using an ultraviolet-visible spectrophotometer equipped with a photoelectric detector at 500 nm. Experimental results showed that, ozonation combined with electrocoagulation process was effective for the decolorization of 4BS, and up to 94% of color decay was obtained at 20℃ after 50 min reaction with a current density of 15 mA · cm^-2 , a pH of 10.0, an initial dye concentration of 100 mg · L^-1 , a supporting electrolyte concentration of 3000 mg · L^-1 , and an ozone flux of 0.6 L· h^-1. The removal of chemical oxygen demand （COD） followed pseudo-second order kinetics. A simplified model for COD reduction was derived by accounting for the contribution of initial COD in the system.

关 键 词：电絮凝 臭氧 4BS染料 

分 类 号：O646[理学—物理化学] X703[理学—化学]