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Quantifying Contribution of Synthrophic Acetate Oxidation to Methane Production in Thermophilic Anaerobic Reactors by Membrane Inlet Mass Spectrometry

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Authors:
  • Mulat, Daniel Girma ;
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    Institut for Ingeniørvidenskab - Manure Technology and Biogas
  • Ward, Alastair James ;
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    Institut for Ingeniørvidenskab - Manure Technology and Biogas
  • Adamsen, Anders Peter S. ;
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    Institut for Ingeniørvidenskab - Air Quality Engineering
  • Voigt, Niels Vinther ;
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    unknown
  • Nielsen, Jeppe Lund ;
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    Orcid logo0000-0002-8747-6938
    Department of Chemistry and Bioscience, The Faculty of Engineering and Science, Aalborg University
  • Feilberg, Anders
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    Institut for Ingeniørvidenskab - Air Quality Engineering
DOI:
10.1021/es403144e
Abstract:
A unique method was developed and applied for monitoring methanogenesis pathways based on isotope labeled substrates combined with online membrane inlet quadrupole mass spectrometry (MIMS). In our study, a fermentation sample from a full-scale biogas plant fed with pig and cattle manure, maize silage, and deep litter was incubated with 100 mM of [2-13C] sodium acetate under thermophilic anaerobic conditions. MIMS was used to measure the isotopic distribution of dissolved CO2 and CH4 during the degradation of acetate, while excluding interference from water by applying a cold trap. After 6 days of incubation, the proportion of methane derived from reduction of CO2 had increased significantly and reached up to 87% of total methane, suggesting that synthrophic acetate oxidation coupled to hydrogenotrophic methanogenesis (SAO-HM) played an important role in the degradation of acetate. This study provided a new approach for online quantification of the relative contribution of methanogenesis pathways to methane production with a time resolution shorter than one minute. The observed contribution of SAO-HM to methane production under the tested conditions challenges the current widely accepted anaerobic digestion model (ADM1), which strongly emphasizes the importance of the acetoclastic methanogenesis.
Type:
Journal article
Language:
English
Published in:
Environmental Science and Technology (washington), 2014, Vol 48, Issue 4, p. 2505-2511
Keywords:
Synthrophic Acetate Oxidation; Methane Production; Thermophilic Anaerobic Reactors; Membrane Inlet Mass Spectrometry; Proteomics
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
258656038

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