Parameteric Optimization of Dye Removal by Electrocoagulation Using Taguchi Methodology

Abstract

This paper utilizes a statistical approach, the Taguchi optimization methodology (L16 orthogonal array), to determine the optimum conditions for the orange-G (OG) dye removal from aqueous solution by electrocoagulation (EC) using iron plate electrodes. The experimental parameters investigated were initial dye concentration (C0): 50-200 mg/l; initial pH (pH0): 2-8; supporting electrolyte (NaCl) concentration (m): 0-1.5 g/l; electrode gap (g):1-2.5 cm; and applied voltage (Vap): 6-24 V. These parameters were varied at four levels to see their effects on the removal efficiency (RE). Vap was found to be the most significant factor with a 24.6 percent contribution, followed by parameter C0 with 20.2 percent contribution to the RE. The predicted optimum value of RE for C0 = 200 mg/l was found to be 84.9 percent. Confirmation experiments have been performed to prove the effectiveness of the Taguchi technique after the optimum levels of process parameters are determined.