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/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 langmuir-hinshelwood was found to follow pseudo first-order kinetics. degradation and mineralization of the ot were tested by hplc and cod tests.