Optimization of Biosorption Conditions for Color Removal by Taguchi DOE Methodology



The biosorption conditions for the removal of Maxilon Red GRL (MR GRL) dye by walnut shell were optimized using the Taguchi technique. This study adopted an L9 orthogonal array based on the Taguchi method to conduct a series of experiments and statistically evaluated the experimental data by the analysis of variance (ANOVA). The main operating parameters including biosorbent dosage, initial dye concentration, and contact time were chosen to achieve the maximum dye removal. The best conditions were found as initial dye concentration of 80 mg L−1, contact time of 120 min and biosorbent dose of 1 g L−1 for the larger is better response category. The biosorbent dosage was found to be the most important factor on the dye removal. The optimal conditions predicted were further validated by the confirmation experiments. In this way, the Taguchi approach proved to bea reliable tool in the optimizing biosorption conditions. ©2012 American Institute of Chemical Engineers Environ Prog, 32: 1129–1133, 2013