Photocatalytic degradation of bagasse pulp wastewater with La-TiO2/Al2O3 as a catalyst

Bagasse pulp wastewater has restricted and disturbed the bagasse pulp industry all the time. In this paper, photocatalytic oxidation technology (O 3 +UV+TiO 2 ) was applied to bagasse pulp wastewater treatment. TiO 2 was prepared into a composite photocatalyst (La-TiO 2 /Al 2 O 3 ) to improve the treatment effect. p-Chlorophenol was chosen as a target compound to evaluate the catalytic activity and study the preparation process of La-TiO 2 /Al 2 O 3 . La-TiO 2 /Al 2 O 3 was finally used in the treatment of real bagasse pulp wastewater with photocatalytic oxidation technology. Under an optimum experiment conditions, chemical oxygen demand (COD) and total organic carbon removal rate of bagasse pulp wastewater reached 80.2% and 77.1%, respectively, and AOX dropped to 2.9 mg/L. Most organic pollutants in the wastewater had been removed. Additionally, in the reusability study, COD removal was maintained at 70.5% at 7th reuse. These findings of present study revealed that La-TiO 2 /Al 2 O 3 held great potential in the practical photocatalytic degradation application of industrial organic wastewater.