title: Comparison of start-up strategies and process performance during semi-continuous anaerobic digestion of sugarcane filter cake co-digested with bagasse.
abstract: The anaerobic digestion of sugarcane filter cake and the option of co-digestion with bagasse were investigated in a semi-continuous feeding regime to assess the main parameters used for large-scale process designing. Moreover, fresh cattle manure was considered as alternative inoculum for the start-up of biogas reactors in cases where digestate from a biogas plant would not be available in remote rural areas. Experiments were carried out in 6 lab-scale semi-continuous stirred-tank reactors at mesophilic conditions (38±1°C) while the main anaerobic digestion process parameters monitored. Fresh cattle manure demonstrated to be appropriate for the start-up process. However, an acclimation period was required due to the high initial volatile fatty acids concentration (8.5gL(-1)). Regardless the mono-digestion of filter cake presented 50% higher biogas yield (480mLgVS(-1)) than co-digestion with bagasse (320mLgVS(-1)) during steady state conditions. A large-scale co-digestion system would produce 58% more biogas (1008m(3)h(-1)) than mono-digestion of filter cake (634m(3)h(-1)) due to its higher biomass availability for biogas conversion. Considering that the biogas production rate was the technical parameter that displayed the most relevant differences between the analyzed substrate options (0.99-1.45m(3)biogasm(3)d(-1)). The decision of which substrate option should be implemented in practice would be mainly driven by the available construction techniques, since economically efficient tanks could compensate the lower biogas production rate of co-digestion option.
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Department 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: Marcell
authors.initials: M
authors.lastname: Nikolausz
authors.affiliation: Laboratório de Remediação Ambiental, Universidade do Vale do Itajaí, Rua Uruguai 458, 88302-202 Itajaí, Brazil.
authors.forename: Claudemir M
authors.initials: CM
authors.lastname: Radetski
authors.affiliation: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Department 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; D000818:Animals; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D002417:Cattle; D002482:Cellulose; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000378:metabolism; D008372:Manure; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D031786:Saccharum
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D008372:Manure; D002482:Cellulose; C027433:bagasse
keywords: Anaerobic digestion; Biogas process; Reactor performance; Start-up; Sugarcane waste