Kinetics of Wet Air Oxidation of High-Strength Industrial Wastewater

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Abstract
Treatment of high-strength desizing wastewater obtained from a textile dyeing and finishing plant by wet air oxidation (WAO) is studied. Experiments were conducted to investigate the effects of the operating pressure, temperature, and airflow rate on the chemical oxygen demand removal. Catalytic effects of copper sulfate (CuSO4) and copper nitrate [Cu(NO3)2] on the WAO treatment efficiency were also examined. It was found that more than 70 of chemical oxygen demand removal can be easily realized in 1 h of WAO oxidation. Two kinetic models (the two-stage, first-order type and the generalized type) were used to represent the WAO treatment reaction and fits of those models to the experimental kinetic data were compared. The rate coefficients and other kinetic parameters of the two models were experimentally determined. Test results indicate that the generalized kinetic model yields a more faithful fit to the kinetic data than the two-stage, first-order alternative while the latter has the advantage of being ...