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The mineralization of C.I. Acid Orange 7 (AO7) azo dye by UV/H2O2 Advanced Oxidation Process was studied in a flux through annular photoreactor. An experimental design based on Response Surface Methodology (RSM) was applied to evaluate the simple and combined effects of influencing independent parameters on mineralization efficiency and optimising the operating conditions of the treatment process. A 2 3  full factorial Central Composite Face centred (CCF) experimental design was employed. Analysis of variance showed a high coefficient of determination value and satisfactory prediction second-order regression model was derived. Graphical response surface and contour plots were used to locate the optimum point. Maximal dye mineralization performance was predicted and experimentally validated. The optimum dye initial concentration, relative initial concentration of H 2 O 2  and time of UV irradiation were found to be 20.01 (mg l -1 ), 54.24 and 179.94 (min), respectively. Under optimal value of process parameters, high mineralization of AO7 dye (87.07 %) was obtained

Application of Response Surface Methodology to Optimise C.I. Acid Orange 7 Azo Dye Mineralization by UV/H 2 O 2 Process