Enhanced biogas production from rice straw, triticale straw and softwood spruce by NMMO pretreatment

Anna Teghammar, Keikhosro Karimi, Ilona Sárvári Horváth, Mohammad J. Taherzadeh

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

Softwood spruce (chips and milled), rice straw and triticale (a hybrid of rye and wheat) straw, were pretreated with N-methylmorpholine-N-oxide (NMMO or NMO) prior to anaerobic digestion to produce biogas. The pretreatments were performed at 130 °C for 1-15 h, and the digestions continued for six weeks. The digestions of untreated chips (10 mm) and milled (<1 mm) spruce, rice straw and triticale straw resulted in 11, 66, 22 and 30 Nml CH 4/g raw material. However, the pretreatments have improved these methane yields by 400-1200%. The best digestion results of the pretreated chips and milled spruce, rice straw and triticale straw were 125, 245, 157 and 203 Nml CH 4/g raw material (or 202, 395, 328 and 362 Nml CH 4/g carbohydrates) respectively, which correspond to 49, 95, 79 and 87% of the theoretical yield of 415 Nml CH 4/g carbohydrates. Although the experiments were carried out for six weeks, one and a half weeks was enough to digest the materials.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalBiomass and Bioenergy
Volume36
DOIs
Publication statusPublished - Jan 2012

Bibliographical note

Funding Information:
This work was financially supported by the Swedish Excellence Centre Waste Refinery . We appreciate Dr. Ria Millati who collected the rice straw in Indonesia and sent it to us.

Keywords

  • Biogas
  • N-methylmorpholine-N-oxide
  • Pretreatment
  • Rice straw
  • Spruce
  • Triticale straw

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