COD and Color Removal from Wastewaters: Optimization of Fenton Process

Abstract

In this study, COD and color removal from wastewaters by Fenton’s oxidation were investigated. In the study the response variables of Y1 and Y2 were selected as COD removal rate (%) and color removal rate(%), and efficacy variables of A, B, anc C were selected as H2O2 concentration (mmol/L), reaction time (h) and H2O2/Fe2+. The experimental design was used as a two-level factorial design. In the corner points 23 = 8, in the center points 3 and a total of 3(8+3)=33 experiments were conducted. Effect of H2O2 concentration (mmol/L), reaction time (h) and H2O2/Fe2+ molar ratio on COD removal rate and color removal rate were investigated. The optimum conditions for maximum COD removal rate and color removal rate were at H2O2 concentration 8 mmol/L, reaction time 3 h and H2O2/Fe2+ molar ratio 2.6. At optimum conditions 82% COD removal rate and 93% color removal rate were achieved.