Optimization of stabilized leachate treatment using ozone/persulfate in the advanced oxidation process

► Ozone and persulfate reagent (O3/S2O82-) was used to treat stabilized leachate. ► Central composite design (CCD) with response surface methodology (RSM) was applied. ► Operating variables including ozone and persulfate dosage, pH variance, and reaction time. ► Optimum removal of COD, color, and NH3-N was 72%, 96%, and 76%, respectively. ► A good value of ozone consumption (OC) obtained with 0.60 (kg O3/kg COD).