title: Methane production from cattle manure supplemented with crude glycerin from the biodiesel industry in CSTR and IBR.
abstract: The aim of the present research work was to optimise biogas production from cattle manure by adding crude glycerin from the biodiesel industry. For this purpose, 6%v/v crude glycerin (the optimum amount according to previous research) was added to ground manure and the mixture was sonicated to enhance biodegradability prior to anaerobic co-digestion at 55 °C. Two different reactors were used: continuously stirred (CSTR) and induced bed (IBR). The methanol and pure glycerin contents of the crude glycerin used in this study were 5.6% and 49.4% (w/w), respectively. The best results when operating in CSTR were obtained for an organic loading rate (OLR) of 5.4 kg COD/m(3) day, obtaining 53.2m(3) biogas/t wet waste and 80.7% COD removal. When operating in IBR, the best results were obtained for an OLR of 6.44 kg COD/m(3)day, obtaining 89.6% COD removal and a biogas production of 56.5m(3)/t wet waste.
authors.affiliation: Chemical Engineering and Environmental Technology Department, University Technology Institute of Asturias, University of Oviedo, Campus of Gijón, 33203 Gijón, Spain. cleonor@uniovi.es
authors.forename: L
authors.initials: L
authors.lastname: Castrillón
authors.forename: Y
authors.initials: Y
authors.lastname: Fernández-Nava
authors.forename: P
authors.initials: P
authors.lastname: Ormaechea
authors.forename: E
authors.initials: E
authors.lastname: Marañón
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002417:Cattle; D002849:Chromatography, Gas; D005990:Glycerol / Q000378:metabolism*; D007700:Kinetics; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000096:biosynthesis*; D013010:Sonication
chemical_list: D056804:Biofuels; D008372:Manure; D008697:Methane; D005990:Glycerol