Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 6, Pages 4449-4455Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.12.096
Keywords
Biofuel; Biogas digestion; Ethanol fermentation; Lignocellulose; Steam explosion
Funding
- Faculty for Natural Resources and Agricultural Sciences, SLU
- Swedish Energy Agency
- Swedish Farmers Research Foundation (SLF)
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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. (C) 2010 Elsevier Ltd. All rights reserved.
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