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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 675651.0, MPI für Chemie / Publikationen MPI für Chemie
Evidence of anaerobic syntrophic acetate oxidation in biogas batch reactors by analysis of 13C carbon isotopes
Authors:Polag, D.; Heuwinkel, H.; Laukenmann, S.; Greule, M.; Keppler, F.
Date of Publication (YYYY-MM-DD):2013-08-20
Title of Journal:Isotopes in Environmental and Health Studies
Issue / Number:3
Start Page:365
End Page:377
Review Status:Internal review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N. N.
Affiliations:MPI für Chemie
Identifiers:ISI:000328015600010 [ID No:1]
ISSN:1025-6016 [ID No:2]
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