The oxidation of fresh and saline wastewater containing an endocrine disrupting chemical (butylated hydroxyanisole, BHA) under different reaction conditions by ozonation and O-3/H2O2 Was investigated at various pH levels. The observed pseudo-first-order reaction kinetics was justified through a combined direct ozone and indirect radical oxidation approach for the ozonation process. The BHA decay rates increased with the increase of the solution pH, but decreased as the NaCl concentration increased because of the consumption of ozone by chloride. A kinetic model was therefore derived for predicting BHA degradation at various initial pH levels and NaCl concentrations. For the O-3/H2O2 and O-3/H2O2/Cl- processes, the rate of BHA removal was investigated at hydrogen peroxide concentration ranged from 0.5 to 5 mM at pH 7. Different optimal H2O2 dosages and decay rates were found for both processes due to the participation of reactions among O-3, H2O2, OH center dot and Cl- as discussed in the paper. (c) 2006 Elsevier B.V. All rights reserved.