In this Investigation, photocatalytic process of COD reduction for a real spent caustic wastewater sample(Red Oil),were used with Design of Experiment(DOE)Method. In this Method, Response surface model(RSM) was obtained in the view of a Box-Behnken design (BBD) with four variables as the input factors, i.e. TiO2 loading (g/l), pH, oxidant amount (ppm) and aeration rate (l/min). The optimum quantity of every factor was calculated according to the experimental settings and statistical model parameters. Finally, High COD removal in 90 min (93%) were obtained under optimum conditions.
Keywords: COD, DOE, Photocatalytic Removal, Red Oil Wastewater, TiO2
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