The performance of the electrocoagulation treatment of synthetic food dye waste industry was studied using iron anode. The influence of several parameters as electrolysis current, chloride concentration, electrolysis time and pH was investigated. In order to verify these factors and their impact on the discoloration efficiency, an experimental design model was established. The mathematical model was created using a rotatable, uniform and central composite design. This model described the color removal efficiency and the energy consumption according to the studied parameters. The graphical representation of the model according to the parameters allowed us to define optimal treatment conditions. The optimal values of electrolysis current, chloride concentration, electrolysis time and pH were respectively 14.4 mA/cm 2 , 5.76 g/L, 39 mn and 7. 94.52% of color removal efficiency is achieved with an energy consumption of 3.90 KWh/m 3 .
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