Improved bio-energy yields via sequential ethanol fermentation and biogas digestion of steam exploded oat straw

Debebe Yilma Dererie, Stefan Trobro, Majid Haddad Momeni, Henrik Hansson, Johanna Blomqvist, Volkmar Passoth, Anna Schnürer, Mats Sandgren, Jerry Ståhlberg

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4449-4455
Number of pages6
JournalBioresource Technology
Volume102
Issue number6
DOIs
Publication statusPublished - 2011
Externally publishedYes

Swedish Standard Keywords

  • Other Agricultural Sciences not elsewhere specified (40599)

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