TREATMENT OF OILY WASTEWATER BY THE FENTON REAGENT AND WET HYDROGEN PEROXIDE OXIDATION

The Fenton reagent was applied to treat oily wastewater at room temperature. The optimum conditions for the treatment were investigated. As a result, when the chemical oxygen demand (COD) is 8000 mg/l in the inflow, the optimum parameters were 2.0 and 0.075 for H2O2/COD (w/w) and Fe2+/COD (w/w), respectively. The COD could be removed by approximately 92%. An induction period was observed in the process. Apparent kinetics of first order was used to explain fast and slow oxidation process, respectively. Furthermore, the role of H2O2 was studied in the wet air oxidation process, where the air was replaced partially or completely by H2O2. The dosage of ferrousion (50 mg/l of Fe2+) was significantly decreased due to the addition of H2O2; COD removal is 83% at 310 degrees C. The COD removal reached 53% at 280 degrees C by using H2O2 (H2O2/COD = 0.05) as the initiator, suggesting an effectively catalytic oxidation.