Study of chemical oxygen demand (COD ) and Removal of azure B dye from aqueous solution by using Advanced Oxidation Processes

Abstract

Decolorization of azure B dye was studied using UV/H2O2, H2O2/Fe2+ and UV/ H2O2/ Fe+2 processes. The effect of initial dye concentration, , pH, Fenton reagent ,temperature , initial hydrogen peroxide dosage, and irradiation time was studied .It has been found that the removal rate increased as the initial concentration of H2O2 and ferrous ion increase to optimum value. The degradation is fast with UV/H2O2/ Fe2+ system. The best results were obtained from photo Fenton's reagent with efficiency more than 99% at pH = 6 , [H2O2] = 500mg/L , [Fe2+]= 150mg/L . The concentration of undegraded dye was detected by using parameters at λmax=646.5nm.In present study the effect of all above effects on chemical oxygen demand(COD), was studied. The results showed that the removal rate were increased as the initial concentration of H2O2 and ferrous ion increased. The decolourization reaction was found to follow , first order kinetics with respect to the dye concentration.