Optimization of Electrochemical Oxidation of Textile Dye Wastewater Using Response Surface Methodology (RSM)

Abstract

The electrochemical treatment of textile dye wastewater containing Levafix Blue CA, Levafix Red CA and Levafix Yellow CA reactive dyes was studied on iron electrodes in the presence of NaCl electrolyte in a batch electrochemical reactor. The wastewater was synthetically prepared in relatively high dye concentrations between 400 and 2,000 mg/L. The effects of initial dye concentration, electrolyte concentration and current density on dye removal, turbidity removal and pH change were studied at 28°C reaction temperature. In the study, complete dye removal and effective turbidity removal achieved; the rate of dye removal obtained as Levafix Yellow CA>Levafix Blue CA>Levafix Red CA at all reaction conditions. The flow pattern was analyzed, mass transfer coefficients and mass fluxes were evaluated. At optimized conditions, mean energy consumption were calculated as 8.3, 9.0 and 7.7 kWh/kg COD removed for Levafix Blue CA, Levafix Red CA and Levafix Yellow CA reactive dyes, respectively.