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Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage

Journal Article


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/m3/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/m3/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.

UOW Authors


  •   Xie, Sihuang
  •   Wu, Guangxue (external author)
  •   Lawlor, Peadar G. (external author)
  •   Frost, J P. (external author)
  •   Zhan, Xinmin (external author)

Publication Date


  • 2012

Citation


  • Xie, S., Wu, G., Lawlor, P. G., Frost, J. P. & Zhan, X. (2012). Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage. Bioresource Technology, 104 289-297.

Scopus Eid


  • 2-s2.0-84655169782

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6235

Number Of Pages


  • 8

Start Page


  • 289

End Page


  • 297

Volume


  • 104

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/m3/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/m3/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.

UOW Authors


  •   Xie, Sihuang
  •   Wu, Guangxue (external author)
  •   Lawlor, Peadar G. (external author)
  •   Frost, J P. (external author)
  •   Zhan, Xinmin (external author)

Publication Date


  • 2012

Citation


  • Xie, S., Wu, G., Lawlor, P. G., Frost, J. P. & Zhan, X. (2012). Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage. Bioresource Technology, 104 289-297.

Scopus Eid


  • 2-s2.0-84655169782

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6235

Number Of Pages


  • 8

Start Page


  • 289

End Page


  • 297

Volume


  • 104