This research presents an experimental design study to statistically optimize electrocoagulation (EC) technology with the use of aluminum (Al) and iron (Fe) electrodes applied in the treatment of cosmetic industry wastewater. The experimental design was conducted according to the rotational central compound design, composed of 12 trials to evaluate the joint influence of two independent variables, current density and operation time. Considering the efficiency of the variable responses obtained through the analysis of variance (ANOVA) in relation to the removal of chemical oxygen demand (COD), turbidity, apparent color and absorbance at λ-350 nm, the experimental results demonstrated with 95% significance of the independent variables. The operating conditions optimized for the EC technology corresponded to: 1,672 A m-2 with operation time of 18.98 min for the Al electrode and 996 A m-2 with operation time of 29.54 min for the Fe electrode. These conditions were considered promising alternatives for the maximization of COD (66.12% Al and 61.35% Fe), turbidity (90.96% Al and 92.31% Fe), apparent color (97.07% Al and 93.69% Fe) and absorbance at λ-350 nm (97.83% Al and 92.69% Fe).
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