Abstract:

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.

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COD_Cr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15 mA·cm^-2，pH值10.0，4BS染料初始浓度100 mg·L^-1，支持电解质浓度3000 mg·L^-1，臭氧流量06 L·h^-1，20 ℃下反应50 min后4BS脱色率达94％以上。COD_Cr去除符合拟二级动力学。