title: The influence of the energy absorbed from microwave pretreatment on biogas production from secondary wastewater sludge.
abstract: In this study, microwave treatment is analyzed as a way to accelerate the hydrolysis in anaerobic digestion of municipal wastewater sludge. The influence of the absorbed energy, power and athermal microwave effect on organic matter solubilization and biogas production has been studied. In addition, a novel method that considers the absorbed energy in the microwave system is proposed, in order to obtain comparable experimental results. The absorbed energy is calculated from an energy balance. The highest solubilization was achieved using 0.54 kJ/ml at 1000 W, where an increment of 7.1% was observed in methane production, compared to the untreated sample. Using a higher energy value (0.83 kJ/ml), methane production further increased (to 15.4%), but solubilization decreased. No power influence was found when 0.54 kJ/ml was applied at 1000, 600 and 440 W. Microwave heating was compared to conventional heating in two different experimental setups, providing similar methane yields in all cases.
authors: Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering (Dr. Mergelina)-University of Valladolid, Doctor Mergelina s/n, 47011 Valladolid, Spain.
authors: Katalin
authors: K
authors: Sólyom
authors: Rafael B
authors: RB
authors: Mato
authors: Sara Isabel
authors: SI
authors: Pérez-Elvira
authors: María José
authors: MJ
authors: Cocero
mesh_terms: D000042:Absorption; D001421:Bacteria, Anaerobic; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D001709:Biotechnology / Q000379:methods*; D004867:Equipment Design; D005740:Gases; D006358:Hot Temperature; D006868:Hydrolysis; D008697:Methane / Q000737:chemistry; D008872:Microwaves; D012722:Sewage / Q000032:analysis*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D056804:Biofuels; D005740:Gases; D012722:Sewage; D014867:Water; D008697:Methane