Investigation of the removal of reactive blue 19 (rb19) from wastewaters by fenton process

The increased complexity in the manufacture of synthetic compounds makes them more resistant and long-term stable in natural environments. Dyestuffs, which are mostly produced synthetically, are also composed of complex aromatic molecules with high stability and difficult to biodegrate. Some dyestuffs and their decomposition products are carcinogenic. In addition, dyes cause discharge problems in wastewater in terms of color and organic matter content. In this study, the removal of Reactive Blue 19 (RB19) dyestuff from wastewaters by Fenton (H2O2/Fe2+) process, which is one of the advanced oxidation processes, was investigated. In experimental studies, the effects of initial H2O2, Fe2+, RB19 concentrations and pH parameters on Fenton process were investigated. Treatment efficiency was monitored by decolorization and reduction in total organic carbon (TOC) concentration. Optimal conditions for color removal were determined as initial concentrations of 100 mg/L H2O2, 10 mg/L Fe2+ and 100 mg/L RB19 at pH 3. The highest TOC removal was optained at initial concentrations of 25 mg/L RB19, 100 mg/L H2O2 and 10 mg/L Fe2+ at pH 3. Color removal of RB19 dyestuff by Fenton process was found to be suitable for pseudo second order kinetics. On the other hand, it was observed that the reaction kinetics give high correlation coefficients in the Bahnajady-Modirdhahla-Ghanbery (BMG) model and followed the BMG kinetic model.