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Improved bio-energy yields via sequential ethanol fermentation and biogas digestion of steam exploded oat straw
Sveriges lantbruksuniversitet.
Institutionen för Molekylärbiologi, Sveriges Lantbruksuniversitet.ORCID iD: 0000-0002-0468-9664
Sveriges lantbruksuniversitet.
Sveriges lantbruksuniversitet.
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2011 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 102, no 6, 4449-4455 p.Article in journal (Refereed) Published
Abstract [en]

Using standard laboratory equipment, thermochemically pretreated oat straw was enzymatically saccharified and fermented to ethanol, and after removal of ethanol the remaining material was subjected to biogas digestion. A detailed mass balance calculation shows that, for steam explosion pretreatment, this combined ethanol fermentation and biogas digestion converts 85-87% of the higher heating value (HHV) of holocellulose (cellulose and hemicellulose) in the oat straw into biofuel energy. The energy (HHV) yield of the produced ethanol and methane was 9.5-9.8 MJ/(kg dry oat straw), which is 28-34% higher than direct biogas digestion that yielded 7.3-7.4 MJ/(kg dry oat straw). The rate of biogas formation from the fermentation residues was also higher than from the corresponding pretreated but unfermented oat straw, indicating that the biogas digestion could be terminated after only 24 days. This suggests that the ethanol process acts as an additional pretreatment for the biogas process.

Place, publisher, year, edition, pages
2011. Vol. 102, no 6, 4449-4455 p.
National Category
Renewable Bioenergy Research
Identifiers
URN: urn:nbn:se:hkr:diva-12007DOI: 10.1016/j.biortech.2010.12.096ISI: 000288356300024PubMedID: 21256738OAI: oai:DiVA.org:hkr-12007DiVA: diva2:719831
Available from: 2014-05-27 Created: 2014-05-27 Last updated: 2015-01-20Bibliographically approved

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