Skip to main content
placeholder image

Effects of thermo-chemical pre-treatment of grass silage on methane production by anaerobic digestion

Journal Article


Abstract


  • Dried grass silage (GS) was pre-treated at different NaOH loading rates (1%, 2.5%, 5% and 7.5% by volatile solids (VS) mass in grass silage) and temperatures (20 C, 60 C, 100 C and 150 C) to determine effects on its bio-degradability in terms of the hydrolysis yield and degradation of ligno-cellulosic materials for biogas production. At 100 C and the four NaOH loadings, up to 45% of the total COD was solubilised and up to 65.6%, 36.1% and 21.2% of lignin, hemicellulose and cellulose were removed, respectively; biological methane production potentials obtained were 359.5, 401.8, 449.5 and 452.5 ml CH4/g VS added, respectively, being improved by 10–38.9% in comparison with untreated GS. VS removals following anaerobic digestion were 67.6%, 76.9%, 85.3%, 95.2% and 96.7% for untreated GS and GS treated at the four NaOH loadings, respectively. 100 C and the NaOH loading rate of 5% is recommended as a proper GS pre-treatment condition.

UOW Authors


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

Publication Date


  • 2011

Citation


  • Xie, S., Frost, J. P., Lawlor, P. G., Wu, G. & Zhan, X. (2011). Effects of thermo-chemical pre-treatment of grass silage on methane production by anaerobic digestion. Bioresource Technology, 102 (19), 8748-8755.

Scopus Eid


  • 2-s2.0-80052536808

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6233

Number Of Pages


  • 7

Start Page


  • 8748

End Page


  • 8755

Volume


  • 102

Issue


  • 19

Abstract


  • Dried grass silage (GS) was pre-treated at different NaOH loading rates (1%, 2.5%, 5% and 7.5% by volatile solids (VS) mass in grass silage) and temperatures (20 C, 60 C, 100 C and 150 C) to determine effects on its bio-degradability in terms of the hydrolysis yield and degradation of ligno-cellulosic materials for biogas production. At 100 C and the four NaOH loadings, up to 45% of the total COD was solubilised and up to 65.6%, 36.1% and 21.2% of lignin, hemicellulose and cellulose were removed, respectively; biological methane production potentials obtained were 359.5, 401.8, 449.5 and 452.5 ml CH4/g VS added, respectively, being improved by 10–38.9% in comparison with untreated GS. VS removals following anaerobic digestion were 67.6%, 76.9%, 85.3%, 95.2% and 96.7% for untreated GS and GS treated at the four NaOH loadings, respectively. 100 C and the NaOH loading rate of 5% is recommended as a proper GS pre-treatment condition.

UOW Authors


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

Publication Date


  • 2011

Citation


  • Xie, S., Frost, J. P., Lawlor, P. G., Wu, G. & Zhan, X. (2011). Effects of thermo-chemical pre-treatment of grass silage on methane production by anaerobic digestion. Bioresource Technology, 102 (19), 8748-8755.

Scopus Eid


  • 2-s2.0-80052536808

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6233

Number Of Pages


  • 7

Start Page


  • 8748

End Page


  • 8755

Volume


  • 102

Issue


  • 19