Removal of Ortho-Toluidine from Industrial Wastewater by UV/TiO2 Process

In this research degradation and mineralization of Ortho-Toluidine (OT) in the wastewater of petrochemical industries was investigated by UV/TiO2 process in a batch recirculating photo reactor. The influence of different variables such as initial pH, amount of TiO2 and initial concentration of OT on the reaction rate was investigated. In optimum conditions (1.75 g/l of catalyst, pH at 7 and initial concentration of OT at 20 mg/l), 93.5% of pollutant and 57% of COD were removed in 180 min of reaction. The reaction rate represented by the mechanism of Langmuir-Hinshelwood was found to follow pseudo first-order kinetics. Degradation and mineralization of the OT were tested by HPLC and COD tests.