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

In this research degradation and mineralization of OrthoToluidine (OT) in the wastewater of petrochemical industries was investigated by UV/TiO 2 process in a batch recirculating photo reactor. The influence of different variables such as initial pH, amount of TiO 2 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 LangmuirHinshelwood was found to follow pseudo firstorder kinetics. Degradation and mineralization of the OT were tested by HPLC and COD tests.