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  Evidence of anaerobic syntrophic acetate oxidation in biogas batch reactors by analysis of 13C carbon isotopes

Polag, D., Heuwinkel, H., Laukenmann, S., Greule, M., & Keppler, F. (2013). Evidence of anaerobic syntrophic acetate oxidation in biogas batch reactors by analysis of 13C carbon isotopes. Isotopes in Environmental and Health Studies, 49(3), 365-377.

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 Creators:
Polag, D.1, Author              
Heuwinkel, H., Author
Laukenmann, S.1, Author              
Greule, M.1, Author              
Keppler, F.1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: Between 2008 and 2010 various batch experiments were carried out to study the stable carbon isotopic composition of biogas (CH4 and CO2) produced from (i) pure sludge and (ii) sludge including maize. From the evolution of the natural isotopic signature, a temporal change of methanogenic pathways could be detected for the treatment with maize showing that a dominance in acetotrophic methanogenesis was replaced by a mixture of hydrogenotrophic and acetotrophic methanogenesis. For pure sludge, hydrogenotrophic methanogenesis was the dominant or probably exclusive pathway. Experiments with isotopically labelled acetate (99% (CH3COONa)-C-13 and 99% (CH3COONa)-C-13) indicated a significant contribution of syntrophic acetate oxidation (SAO) for all the investigated treatments. In the case of pure sludge, experiments from 2008 showed that acetate was almost entirely oxidised to CO2, i.e. acetotrophic methanogenesis was negligible. However, in 2010, the sludge showed a clear dominance in acetotrophic methanogenesis with a minor contribution by SAO indicating a significant change in the metabolic character. Our results indicate that SAO during anaerobic degradation of maize might be a significant process that needs to be considered in biogas research.

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Language(s): eng - English
 Dates: 2013-08-20
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 675651
ISI: 000328015600010
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Title: Isotopes in Environmental and Health Studies
Source Genre: Journal
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Pages: - Volume / Issue: 49 (3) Sequence Number: - Start / End Page: 365 - 377 Identifier: ISSN: 1025-6016