Journal article
Upgrading of straw hydrolysate for production of hydrogen and phenols in a microbial electrolysis cell (MEC)
Bioenergy and Biomass, Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
In a microbial electrolysis cell (MEC), hydrolysate produced by hydrothermal treatment of wheat straw was used for hydrogen production during selective recovery of phenols. The average H2 production rate was 0.61 m3 H2/m3 MEC·day and equivalent to a rate of 0.40 kg COD/m3 MEC·day. The microbial community in the anode biofilm was adapted by establishment of xylose-degrading bacteria of the Bacteriodetes phylum (16%) and Geobacter sulfurreducens (49%).
During the process, 61% of the chemical oxygen demand was removed as hydrogen at 64% yield. The total energy production yield was 78% considering the energy content in the consumed compounds and the cell voltage of 0.7 V. The highest hydrogen production was equivalent to 0.8 kg COD/m3 MEC·day and was obtained at pH 7–8 and 25°C.
Accumulation of 53% w/v phenolic compounds in the liquor was obtained by stepwise addition of the hydrolysate during simultaneous production of hydrogen from consumption of 95% for the hemicellulose and 100% of the fatty acids. Final calculations showed that hydrolysate produced from 1 kg wheat straw was upgraded by means of the MEC to 22 g hydrogen (266 L), 8 g xylan, and 9 g polyphenolics for potential utilization in biobased materials.
Language: | English |
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Publisher: | Springer-Verlag |
Year: | 2011 |
Pages: | 855-865 |
ISSN: | 14320614 and 01757598 |
Types: | Journal article |
DOI: | 10.1007/s00253-010-3068-3 |
ORCIDs: | Thygesen, Anders |
Bacteria Bioelectric Energy Sources Biotechnology Chemistry Cluster Analysis DNA, Bacterial DNA, Ribosomal Electrolysis Electrophoresis, Polyacrylamide Gel Hemicellulose Hydrogen Hydrothermal treatment Microbial Genetics and Genomics Microbiology Molecular Sequence Data Nucleic Acid Denaturation Phenolic compounds Phenols Phylogeny Plant Stems RNA, Ribosomal, 16S Sequence Analysis, DNA Triticum Wheat straw