title: Wastewater sludges pretreated by different oxidation systems at mild conditions to promote the biogas formation in anaerobic processes.
abstract: The effect of different oxidation processes at mild conditions including the coupled-Fenton (sono-Fenton, photo-Fenton, and sono-photo-Fenton) and their blank systems (ultrasound, ultraviolet, zero valent iron, and Fenton) on anaerobic digestion of the sludge for biogas production was investigated. Ultrasounds led to the highest organic matter solubilization (3.8 up to 5.2 g chemical oxygen demand (COD)/L, for the raw and treated sludge, respectively), while for the rest, organic matter transformation was observed resulting in an almost soluble COD net balance. Results indicated that for the most oxidative processes, the released organic matter was probably mineralized by the hydroxyl radicals produced during the treatments. It is interesting to remark that even if the biochemical methane potential was barely enhanced by the different methods applied, all the methods demonstrated to enhance the overall kinetics of the biomethanation processes, increasing the rapidly biodegradable fraction of the sludge.
authors.affiliation: Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933, Madrid, Spain. yolanda.segura@urjc.es.
authors.forename: Y
authors.initials: Y
authors.lastname: Segura
authors.affiliation: Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933, Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Puyol
authors.affiliation: Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933, Madrid, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Ballesteros
authors.affiliation: Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933, Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Martínez
authors.affiliation: Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933, Madrid, Spain.
authors.forename: J A
authors.initials: JA
authors.lastname: Melero
mesh_terms: D056804:Biofuels / Q000032:analysis*; D057919:Biological Oxygen Demand Analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D008697:Methane / Q000032:analysis*; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D012722:Sewage / Q000032:analysis / Q000737:chemistry*; D000069453:Ultrasonic Waves; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D056804:Biofuels; D006861:Hydrogen Peroxide; D007501:Iron; D008697:Methane; D012722:Sewage; D062065:Wastewater; C045076:Fenton's reagent
keywords: Advanced oxidation processes; Biogas formation; Wastewater sludges