Kinetic investigation of 1,9-dimethyl-methylene blue zinc chloride double salt removal from wastewater using ferrate (VI) and ultraviolet radiation

Abstract

Ferrate (VI) oxidation process and UV radiation can be used for the removal of dye from wastewater. The aims of this study are 1) investigation of optimal conditions for removal of 1,9-dimethyl-methylene blue zinc chloride double salt from wastewater using ferrate (VI) oxidation process and UV radiation and 2) Study on kinetics coefficient of removal of this compound from wastewater by both ferrate (VI) oxidation and UV radiation. For determination of the optimum conditions for removal of the 1,9-dimethyl-methylene blue zinc chloride double salt, response surface methodology was used. The parameters were pH, temperature, hydraulic retention time (HRT) and initial dye concentration. The results showed that the optimum conditions for the removal of dye by ferrate (VI) oxidation process were at pH of 1.4, temperature of 50 °C, HRT in 50 min and initial dye concentration of 70 mg/L. Also, the optimum conditions for dye removal by UV radiation were at pH 13.5, temperature at 45 °C, HRT in 43 min and initial dye concentration of 66 mg/L. In addition, it is confirmed that the removal of dye from wastewater by both ferrate (VI) oxidation process and UV radiation were first order kinetics. Keywords: Ferrate (VI), Wastewater treatment, Chemical oxidation, UV radiation