title: Optimization of semi-aerobic stabilized leachate treatment using ozone/Fenton's reagent in the advanced oxidation process.
abstract: The objective of this study was to investigate the performance of employing Fenton's reagent in the advanced oxidation of ozone to treat stabilized landfill leachate in an ozone reactor. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables, such as ozone and Fenton dosage, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following four responses proved to be significant with very low probabilities (<0.0001): chemical oxygen demand (COD), color, NH-N, and ozone consumption (OC). The obtained optimum conditions included a reaction time of 90 min, 30 g/m³ ozone, 0.01 mol/L₂H₂O,0.02 mol/L Fe²⁺, and pH 5. COD, color, and NH₃-N removal rates of 79%, 100%, and 20%, respectively, and 0.18 kg O₃/kg COD OC were obtained. The predictions correspond well with experimental results (COD, color, and NH-N removal rates of 78%, 98.5%, and 19%, respectively, and 0.29 kg O₃/kg COD OC). This method reduces the treatment time and improves the treatment efficiency relative to a previously published method that used Fenton's reagent prior to ozonation.
authors: School of Civil Engineering, Engineering Campu , Universiti Sains Malaysia, Penang , Malaysia.
authors: Salem S
authors: SS
authors: Abu Amr
authors: Hamidi Abdul
authors: HA
authors: Aziz
authors: Mohd Nordin
authors: MN
authors: Adlan
authors: Mohammed J K
authors: MJ
authors: Bashir
mesh_terms: D000641:Ammonia / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D003116:Color; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010126:Ozone / Q000032:analysis / Q000737:chemistry*; D011930:Reaction Time; D013053:Spectrophotometry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; D010126:Ozone; D000641:Ammonia; D006861:Hydrogen Peroxide; D007501:Iron