Experimental Study on Photocatalytic pretreatment of Restaurant Wastewater with nano TiO2

The study aims at investigating the performance of nano TiO2 photocatalytic oxidation technology for the pretreatment of restaurant wastewater. The rate of lipids removal depends on conditions, such as irradiation time, TiO2 dosage, aeration and addition of Fe3+ or H2O2.The optimal conditions are determined: proper time of irradiation 10 min, TiO2 dosage 25mg/L,pH6.0, adding 5mL Fe3+. Under this optimum, the removal efficiency of lipids reaches 74.7 similar to 88.6%, and that of CODcr was around 45.2 similar to 76.2%.While using illumination for 10 min, companied with TiO2 and Fe3+/H2O2, the removal efficiency of Grease could increase by 3%similar to 15%.Thus, satisfactory results were achieved for pretreatment of Grease Wastewater from restaurant, and this technique could be used as a pretreatment step for next biological treatment of restaurant wastewater.