Removal of Congo Red dye from aqueous solution by ozonation combined sonolysis
Subject Areas : Chemistry and Chemical Engineering of all specializations
Keywords: pH, Ultrasonic, ozonation, Congo red color, O3/US ( combined ozone and sonolysis), AOPs(Advanced oxidation processes),
Abstract :
In this study, the destruction of Congo Red dye was studied using a combined O3/US technique. In dyeing and textile complexes a considerable amount of wastewater is produced in different stages of processing. The wastewater of such units are treated by techniques of low efficiency. Most of dyes, as Congo red, are nonbiodegradable and can not be removed through prevalent techniques. The AOPs methods have been found to be a suitable method for removing the dye; e. g. O3/US. It was known that when O3/US method applied, the degradation time reduced very significantly compared with that of ozone alone. Furthermore, it was found that the maximum degradation occurred at pH=11. Ultrasonic experiments indicated the fact that as the intensity of irradiation increased, the more degradation of dye happened. At 12 minute duration of experiment, the Congo Red dye was completely removed with trace concentration of 50-100 ppm.
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