title: Enhancing biogas production from vinasse in sugarcane biorefineries: Effects of urea and trace elements supplementation on process performance and stability.
abstract: In this study, the effects of nitrogen, phosphate and trace elements supplementation were investigated in a semi-continuously operated upflow anaerobic sludge blanket system to enhance process stability and biogas production from sugarcane vinasse. Phosphate in form of KH2PO4 induced volatile fatty acids accumulation possibly due to potassium inhibition of the methanogenesis. Although nitrogen in form of urea increased the reactor's alkalinity, the process was overloaded with an organic loading rate of 6.1gCODL(-1)d(-1) and a hydraulic retention time of 3.6days. However, by supplementing urea and trace elements a stable operation even at an organic loading rate of 9.6gCODL(-1)d(-1) and a hydraulic retention time of 2.5days was possible, resulting in 79% higher methane production rate with a stable specific methane production of 239mLgCOD(-1).
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany. Electronic address: leandro.janke@dbfz.de.
authors.forename: Leandro
authors.initials: L
authors.lastname: Janke
authors.affiliation: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany.
authors.forename: Athaydes F
authors.initials: AF
authors.lastname: Leite
authors.affiliation: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany.
authors.forename: Karla
authors.initials: K
authors.lastname: Batista
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany.
authors.forename: Witan
authors.initials: W
authors.lastname: Silva
authors.affiliation: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318 Leipzig, Germany.
authors.forename: Marcell
authors.initials: M
authors.lastname: Nikolausz
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nelles
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Stinner
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000378:metabolism; D008697:Methane / Q000096:biosynthesis; D009584:Nitrogen / Q000378:metabolism; D010710:Phosphates / Q000737:chemistry / Q000378:metabolism; D017680:Potassium Compounds / Q000737:chemistry / Q000378:metabolism; D031786:Saccharum / Q000737:chemistry* / Q000378:metabolism; D012722:Sewage; D014131:Trace Elements / Q000737:chemistry / Q000378:metabolism; D014508:Urea / Q000737:chemistry* / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D010710:Phosphates; D017680:Potassium Compounds; D012722:Sewage; D014131:Trace Elements; D014508:Urea; C013216:potassium phosphate; D009584:Nitrogen; D008697:Methane
keywords: Anaerobic digestion; Biogas productivity; Process stability; Sugarcane vinasse