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The electro-Fenton process was used to assess the decoloration of Orange II in aqueous solutions. Hydrogen peroxide (H₂O₂) was electro-generated by reduction of dissolved oxygen (DO) in acidic solutions containing dilute supporting electrolyte. This oxidation process allows the production of active intermediates, which react on the organic compounds, leading to their mineralization. Decoloration experiments were performed in the presence of perchlorate, chloride and sulfate electrolyte media at pH 3.0 under potential controlled electrolysis conditions. Effect of operational parameters such as cathodic potential, oxygen mass flow rate and inert supporting electrolyte type and concentration were investigated to find the best experimental conditions for achieving overall dye decoloration. Complete decoloration of Orange II occurs in less than 90min. In addition, effect of cathode surface area and electrolyte …