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Effect of the N-methylmorpholine-N-oxide (NMMO) pretreatment on anaerobic digestion of forest residues
University of Borås, Sweden.
RISE., SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
University of Borås, Sweden.
University of Borås, Sweden.
2013 (Engelska)Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 8, nr 4, s. 5409-5423Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Pretreatment of forest residues using N-methylmorpholine-N-oxide (NMMO or NMO) prior to anaerobic digestion was investigated, where the effects of particle size, NMMO concentration, and pretreatment time were the primary focus. The pretreatments were carried out on forest residues; with different particle sizes of 2, 4 and 8 mm, at 120 °C for 3, 7, and 15 h in two different modes of NMMO-treatment: dissolution by 85% NMMO and swelling without dissolution using 75% NMMO solution in water. The pretreatment process led to minor changes in the composition of the forest residues. The best improvement in methane yield of the forest residues was achieved by pretreatment using 85% NMMO for 15 h at 120 °C. This treatment resulted in 0.17 Nm3/kg VS methane yield, which corresponds to 83% of the expected theoretical yield of carbohydrates present in the material. Additionally, the accumulated methane yield and the rate of the methane production were highly affected by the amounts of remaining NMMO when it was not well separated during the washing and filtration steps after the treatment. The presence of concentrations even as low as 0.008% NMMO resulted in a decrease in the final methane yield by 45%, while the presence of 1% of this solvent in the digester completely terminated the anaerobic digestion process.

Ort, förlag, år, upplaga, sidor
2013. Vol. 8, nr 4, s. 5409-5423
Nyckelord [en]
Anaerobic digestion, Biogas, Degradation, Forest residues, Inhibition, Lignocelluloses, NMMO
Nationell ämneskategori
Lantbruksvetenskap, skogsbruk och fiske
Identifikatorer
URN: urn:nbn:se:ri:diva-2409DOI: 10.15376/biores.8.4.5409-5423Scopus ID: 2-s2.0-84887168436OAI: oai:DiVA.org:ri-2409DiVA, id: diva2:959999
Tillgänglig från: 2016-09-07 Skapad: 2016-09-07 Senast uppdaterad: 2020-12-01Bibliografiskt granskad

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