title: Effect of ultrasound pre-treatment in the anaerobic co-digestion of cattle manure with food waste and sludge.
abstract: This paper presents a study of the effect of applying ultrasound pre-treatment in the production of methane when co-digesting mixtures of cattle manure with food waste and sludge. A series of experiments were carried out under mesophilic and thermophilic conditions in continuously stirred-tank reactors containing 70% cattle manure, 20% food waste and 10% sewage sludge. Ultrasound pre-treatment allows operating at lower HRT, achieving higher volumetric methane yields: 0.85 L CH4/L day at 36°C and 0.82 CH4/L day at 55°C, when cattle manure and sewage sludge were sonicated. With respect to the non-sonicated waste, these values represent increases of up to 31% and 67% for mesophilic and thermophilic digestion, respectively.
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: G
authors.initials: G
authors.lastname: Quiroga
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Castrillón
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: Y
authors.initials: Y
authors.lastname: Fernández-Nava
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain. Electronic address: emara@uniovi.es.
authors.forename: E
authors.initials: E
authors.lastname: Marañón
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Negral
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez-Iglesias
authors.affiliation: Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Ormaechea
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D002417:Cattle; D005502:Food; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000032:analysis; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D014465:Ultrasonics / Q000295:instrumentation / Q000379:methods*; D014835:Volatilization; D014866:Waste Products / Q000032:analysis*
chemical_list: D056804:Biofuels; D008372:Manure; D012722:Sewage; D014866:Waste Products; D008697:Methane
keywords: Anaerobic co-digestion; Cattle manure; Food waste; Sewage sludge; Ultrasound