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.