title: Performance of combined sodium persulfate/H2O2 based advanced oxidation process in stabilized landfill leachate treatment.
abstract: A combination of persulfate and hydrogen peroxide (S2O8(2-)/H2O2) was used to oxidizelandfill leachate. The reaction was performed under varying S2O8(2-)/H2O2 ratio (g/g), S2O8(2-)/H2O2 dosages (g/g), pH, and reaction time (minutes), so as to determine the optimum operational conditions. Results indicated that under optimum operational conditions (i.e. 120 min of oxidation using a S2O8(2-)/H2O2 ratio of 1 g/1.47 g at a persulfate and hydrogen peroxide dosage of 5.88 g/50 ml and8.63 g/50 ml respectively, at pH 11) removal of 81% COD and 83% NH3-N was achieved. In addition, the biodegradability (BOD5/COD ratio) of the leachate was improved from 0.09 to 0.17. The results obtained from the combined use of (S2O8(2-)/H2O2) were compared with those obtained with sodium persulfate only, hydrogen peroxide only and sodium persulfate followed by hydrogen peroxide. The combined method (S2O8(2-)/H2O2) achieved higher removal efficiencies for COD and NH3-N compared with the other methods using a single oxidizing agent. Additionally, the study has proved that the combination of S2O8(2-)/H2O2 is more efficient than the sequential use of sodium persulfate followed by hydrogen peroxide in advanced oxidation processes aiming at treatingstabilizedlandfill leachate.
authors.affiliation: Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt.
authors.forename: Ahmed H
authors.initials: AH
authors.lastname: Hilles
authors.affiliation: Malaysian Institute of Chemical and Bioengineering Technology, Universiti Kuala Lumpur (UniKL, MICET), Melaka, Malaysia. Electronic address: sabuamr@hotmail.com.
authors.forename: Salem S
authors.initials: SS
authors.lastname: Abu Amr
authors.affiliation: Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt.
authors.forename: Rim A
authors.initials: RA
authors.lastname: Hussein
authors.affiliation: Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt.
authors.forename: Olfat D
authors.initials: OD
authors.lastname: El-Sebaie
authors.affiliation: Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt.
authors.forename: Anwaar I
authors.initials: AI
authors.lastname: Arafa
mesh_terms: D001673:Biodegradation, Environmental; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D017670:Sodium Compounds / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D017670:Sodium Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; C024625:sodium persulfate
keywords: Advanced oxidation; Biodegradability; Landfill leachate; Persulfate