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Xie, S,Wu, G,Lawlor, PG,Frost, JP,Zhan, X
Bioresource Technology
Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage
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Co-digestion Energy yield Grass silage Organic loading rate Pig manure BIOGAS PRODUCTION ENERGY CROPS OPTIMIZATION SLURRY SCALE
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 degrees 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. (C) 2011 Elsevier Ltd. All rights reserved.
DOI 10.1016/j.biortech.2011.11.076
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