Degradation of furfural (2- furaldehyde) to methane and carbon dioxide by an anaerobic consortium |
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Authors: | Rivard Christopher j Grohmann karel |
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Institution: | 1.Applied Biological Sciences Section, Biotechnology Research Branch, Solar Fuels Research Division, Solar Energy Research Institute, 1617 Cole Boulevard, 80401, Golden, CO ; |
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Abstract: | Furfural, a byproduct formed during the thermal/chemical pre-treatment of hemicellulosic biomass, was degraded to methane
and carbon dioxide under anaerobic conditions. The consortium of anaerobic microbes responsible for the degradation was enriched
using small continuously stirred tank reactor (CSTR) systems with daily batch feeding of biomass pretreatment liquor and continuous
addition of furfural. Although the continuous infusion of furfural was initially inhibitory to the anaerobic CSTR system,
adaptation of the consortium occurred rapidly with high rates of furfural addition. Addition rates of 7.35 mg furfural/700-mL
reactor/d resulted in biogas productions of 375%, of that produced in control CSTR systems, fed the biomass pretreatment liquor
only. The anaerobic CSTR system fed high levels of furfural was stable, with a sludge pH of 7.1 and methane gas composition
of 69%, compared to the control CSTR, which had a pH of 7.2 and 77% methane. CSTR systems in which furfural was continuously
added resulted in 80% of the theoretically expected biogas. Intermediates in the anaerobic biodegradation of furfural were
determined by spike additions in serum-bottle assays using the enriched consortium from the CSTR systems. Furfural was converted
to several intermediates, including furfuryl alcohol, furoic acid, and acetic acid, before final conversion to methane and
carbon dioxide. |
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Keywords: | Index Entries" target="_blank">Index Entries Anaerobic digestion CSTR furfural furfuryl alcohol furoic acid methane production |
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