Photooxidative Removal of Phenazopyridine by UV/H2O2 Process in a Batch Re-circulated Annular Photoreactor: Influence of Operational Parameters

In this work, efficiency of UV/H2O2 process in the removal of Phenazopyridine (PhP) as a model contaminant from pharmaceutical compounds was investigated. For this purpose, a suitable batch re-circulated annular photoreactor with a replaceable UV-C lamp in the center of photoreactor was used. Effect of operational parameters such as initial PhP concentration, H2O2 concentration, UV-light source power and pH of the solution was investigated. Results indicate UV/H2O2 process is a powerful method for removal of PhP from aqueous solutions so that a considerable removal of this contaminant has been obtained in the short irradiation time.