title: Biogas production from wheat straw and manure--impact of pretreatment and process operating parameters.
abstract: Non-treated or steam-exploded straw in co-digestion with cattle manure was evaluated as a substrate for biogas production compared with manure as the sole substrate. All digestions were performed in laboratory-scale CSTR reactors (5L) operating with an organic loading late of approximately 2.8 g VS/L/day, independent of substrate mixture. The hydraulic retention was 25 days and an operating temperature of 37, 44 or 52°C. The co-digestion with steam exploded straw and manure was evaluated with two different mixtures, with different proportion. The results showed stable performance but low methane yields (0.13-0.21 N L CH4/kg VS) for both manure alone and in co-digestion with the straw. Straw appeared to give similar yield as manure and steam-explosion treatment of the straw did not increase gas yields. Furthermore, there were only slight differences at the different operating temperatures.
authors.affiliation: Department of Microbiology, Swedish University of Agricultural Science, Uppsala BioCenter, P.O. Box 7025, SE-750 07 Uppsala, Sweden.
authors.forename: Kajsa
authors.initials: K
authors.lastname: Risberg
authors.forename: Li
authors.initials: L
authors.lastname: Sun
authors.forename: Lotta
authors.initials: L
authors.lastname: Levén
authors.forename: Svein Jarle
authors.initials: SJ
authors.lastname: Horn
authors.forename: Anna
authors.initials: A
authors.lastname: Schnürer
mesh_terms: D000818:Animals; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002417:Cattle; D008372:Manure; D008697:Methane / Q000378:metabolism; D013227:Steam; D014908:Triticum / Q000737:chemistry*; D014866:Waste Products
chemical_list: D056804:Biofuels; D008372:Manure; D013227:Steam; D014866:Waste Products; D008697:Methane
keywords: Biogas; C/N ratio; Cattle manure; Steam explosion; Wheat straw