KINETICS OF WET AIR OXIDATION OF HIGH-STRENGTH INDUSTRIAL WASTE-WATER

Treatment of high-strength desizing wastewater obtained from a textile dyeing and finishing plant by wet air oxidation (WAO) is studied. Exp eriments were conducted to investigate the effects of the operating pr essure, temperature, and airflow rate on the chemical oxygen demand re moval, Catalytic effects of copper sulfate (CuSO4) and copper nitrate [Cu(NO3)(2)] on the WAO treatment efficiency were also examined. It wa s found that more than 70% of chemical oxygen demand removal can be ea sily realized in I h of WAO oxidation. Two kinetic models (the two-sta ge, first-order type and the generalized type) were used to represent the WAO treatment reaction and fits of those models to the experimenta l kinetic data were compared. The rate coefficients and other kinetic parameters of the two models were experimentally determined. Test resu lts indicate that the generalized kinetic model yields a more faithful fit to the kinetic data than the two-stage, first-order alternative w hile the latter has the advantage of being much easier to use.