title: Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage.
abstract: Anaerobic co-digestion of the solid fraction of separated pig manure (SPM) with dried grass silage (DGS) was evaluated in three identical continuously stirred tank reactors (CSTRs) at 35±1 °C. The feedstock contained 20% DGS in CSTR1, 30% DGS in CSTR2 and 40% DGS in CSTR3 on a volatile solids (VS) basis. Organic loading rates (OLR) of 1.0, 1.5, 2.0 and 3.0 kg VS/m(3)/d were studied and it was found that the OLR affected the digester performance more than the DGS proportion in the feedstock. Tripling the OLR increased volumetric methane yields by 88% and decreased specific methane yields by 38%. At the OLR of 3 kg VS/m(3)/d, post-methane production potentials of digestates ranged from 38% to 41% of total methane production potentials of the feedstock. An energy yield estimation on a 654-sow pig unit showed that 268-371 MWh/a electricity and 383-530 MWh/a heat would be generated.
authors.affiliation: Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
authors.forename: S
authors.initials: S
authors.lastname: Xie
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: P G
authors.initials: PG
authors.lastname: Lawlor
authors.forename: J P
authors.initials: JP
authors.lastname: Frost
authors.forename: X
authors.initials: X
authors.lastname: Zhan
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D005591:Chemical Fractionation; D005374:Filtration / Q000379:methods*; D007220:Industrial Waste / Q000517:prevention & control; D008372:Manure / Q000382:microbiology*; D008697:Methane / Q000378:metabolism*; D006109:Poaceae / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012820:Silage / Q000382:microbiology*; D013552:Swine
chemical_list: D007220:Industrial Waste; D008372:Manure; D008697:Methane