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This study makes a comparison between UV/Nano-TiO₂, Fenton, Fenton-like, electro-Fenton (EF) and electrocoagulation (EC) treatment methods to investigate the removal of C.I. Acid Blue 9 (AB9), which was chosen as the model organic contaminant. Results indicated that the decolorization efficiency was in order of Fenton>EC>UV/Nano-TiO₂>Fenton-like>EF. Desired concentrations of Fe²⁺ and H₂O₂ for the abatement of AB9 in the Fenton-based processes were found to be 10⁻⁴M and 2×10⁻³M, respectively. In the case of UV/Nano-TiO₂ process, we have studied the influence of the basic photocatalytic parameters such as the irradiation time, pH of the solution and amount of TiO₂ nanoparticles on the photocatalytic decolorization efficiency of AB9. Accordingly, it could be stated that the complete removal of color, after selecting desired operational parameters could be achieved in a relatively short time, about …