title: Landfill leachate treatment by electrochemical oxidation.
abstract: This study investigated the electrochemical oxidation of stabilized leachate from Pulau Burung semi-aerobic sanitary landfill by conducting laboratory experiments with sodium sulfate Na(2)SO(4) (as electrolyte) and graphite carbon electrodes. The control parameters were influent COD, current density and reaction time, while the responses were BOD removal, COD removal, BOD:COD ratio, color and pH. Na(2)SO(4) concentration was 1 g/L. Experiments were conducted based on a three-level factorial design and response surface methodology (RSM) was used to analyze the results. The optimum conditions were obtained as 1414 mg/L influent COD concentration, 79.9 mA/cm(2) current density and 4 h reaction time. This resulted in 70% BOD removal, 68% COD removal, 84% color removal, 0.04 BOD/COD ratio and 9.1 pH. Electrochemical treatment using graphite carbon electrode was found to be effective in BOD, COD and color removal but was not effective in increasing the BOD/COD ratio or enhancing biodegradability of the leachate. The color intensity of the treated samples increased at low influent COD and high current density due to corrosion of electrode material.
authors.affiliation: School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
authors.forename: Mohammed J K
authors.initials: MJ
authors.lastname: Bashir
authors.forename: Mohamed Hasnain
authors.initials: MH
authors.lastname: Isa
authors.forename: Shamsul Rahman Mohamed
authors.initials: SR
authors.lastname: Kutty
authors.forename: Zarizi Bin
authors.initials: ZB
authors.lastname: Awang
authors.forename: Hamidi Abdul
authors.initials: HA
authors.lastname: Aziz
authors.forename: Soraya
authors.initials: S
authors.lastname: Mohajeri
authors.forename: Izharul Haq
authors.initials: IH
authors.lastname: Farooqi
mesh_terms: D000704:Analysis of Variance; D002244:Carbon / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006108:Graphite; D007700:Kinetics; D009930:Organic Chemicals / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D013431:Sulfates / Q000737:chemistry; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D013431:Sulfates; D014874:Water Pollutants, Chemical; C012036:sodium sulfate; D002244:Carbon; D006108:Graphite; D010100:Oxygen