ABSTRACT
In the present work, degradation of three commercial azo-dyes in the presence of hydrodynamic cavitation (HC) and hydrogen peroxide based hybrid advanced oxidation process (HAOP) has been investigated. The 284influence of quantitative addition of hydrogen peroxide (H2O2) for the degradation of dyes was examined. H2O2 has been used as an oxidizing agent to improve the degradation efficiency through cavitating device. UV-Visible scanning spectrophotometer analysis has been carried for the investigation of decolorization of mixture of dyes. It was observed that 39% of decolorization was obtained using HC alone and 25% of decolorization was achieved using H2O2 alone. With the use of hybrid process 65% of decolorization was obtained. The mineralization of dye solution was also evaluated by measuring the total organic carbon (TOC) of the dye solution. 28% of mineralization rate of tertiary dye mixture were attained using HC alone and it is increases to 51% by combining HC with 100 mmol/L of H2O2. Synergetic effect of HAOP based on kinetic data was also investigated for the degradation of dye solution in the presence of hydrodynamic cavitation and H2O2. Kinetic studies of the HAOP that followed the pseudo first-order reaction kinetics. HC+H2O2 have suggested that the combination of HC with other oxidizing agents is better than the individual processes for the degradation of dye solution. Synergistic effect of combined techniques has been found based on the rate kinetics of decolorization and degradation reaction.
