title: Effect of persulfate and persulfate/H₂O₂ on biodegradability of an anaerobic stabilized landfill leachate.
abstract: The current study investigated the effects of S2O8(2-) and S2O8(2-)/H2O2 oxidation processes on the biodegradable characteristics of an anaerobic stabilized leachate. Total COD removal efficiency was found to be 46% after S2O8(2-) oxidation (using 4.2 g S2O8(2-)/1g COD0, at pH 7, for 60 min reaction time and at 350 rpm shaking speed), and improved to 81% following S2O8(2-)/H2O2 oxidation process (using 5.88 g S2O8(2-) dosage, 8.63 g H2O2 dosage, at pH 11 and for 120 min reaction time at 350 rpm). Biodegradability in terms of BOD5/COD ratio of the leachate enhanced from 0.09 to 0.1 and to 0.17 following S2O8(2-) and S2O8(2-)/H2O2 oxidation processes, respectively. The fractions of COD were determined before and after each oxidation processes (S2O8(2-) and S2O8(2-)/H2O2). The fraction of biodegradable COD(bi) increased from 36% in raw leachate to 57% and 68% after applying S2O8(2-) and S2O8(2-)/H2O2 oxidation, respectively. As for soluble COD(s), its removal efficiency was 39% and 78% following S2O8(2-) and S2O8(2-)/H2O2 oxidation, respectively. The maximum removal for particulate COD was 94% and was obtained after 120 min of S2O8(2-)/H2O2 oxidation. As a conclusion, S2O8(2-)/H2O2 oxidation could be an efficient method for improving the biodegradability of anaerobic stabilized leachate.
authors.affiliation: Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt; Environment Quality Authority, Palestine.
authors.forename: Ahmed H
authors.initials: AH
authors.lastname: Hilles
authors.affiliation: School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, 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: Anwar I
authors.initials: AI
authors.lastname: Arafa
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
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D013431:Sulfates; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide
keywords: Biodegradability; COD fractions; Leachate; Oxidation; Soluble