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Ammonia, a selective agent for methane production by syntrophic acetate oxidation at mesophilic temperature
RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.ORCID iD: 0000-0002-1662-9730
2008 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 57, no 5, p. 735-740Article in journal (Refereed) Published
Abstract [en]

In biogas processes, methane production from acetate proceeds by either aceticlastic methanogenesis or through syntrophic acetate oxidation (SAO). In the present study, the pathway for methane production from acetate was analysed; i) during a gradual increase of the ammonia concentration (final concentration 7 g NH4+ - N/L) in a semi-continuous lab-scale anaerobic digester (4.3 L), operating at mesophilic temperature (37°C) or ii) in diluted enrichment cultures (100 ml) experiencing a gradual increase in ammonia, sodium, potassium and propionic acid. The pathway for methane formation was determined by calculating the 14CO2/14CH 4 ratio after incubating samples with 14C-2-acetate. In the anaerobic digester, as well as in the enrichment cultures, the 14CO2/14CH4 ratio clearly increased with increasing ammonium-nitrogen concentration, i.e. as the ammonia concentration increased, a shift from the aceticlastic mechanism to the syntrophic pathway occurred. The shift was very distinct and occurred as the NH4+ - N concentration rose above 3 g/l. No shift in pathway was seen during increasing concentrations of sodium, potassium or propionic acid. The shift to SAO in the biogas digester resulted in a twofold decrease in the specific gas and methane yield. © IWA Publishing 2008.

Place, publisher, year, edition, pages
2008. Vol. 57, no 5, p. 735-740
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Agricultural Science, Forestry and Fisheries
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URN: urn:nbn:se:ri:diva-2457DOI: 10.2166/wst.2008.097PubMedID: 18401146Scopus ID: 2-s2.0-43949126872OAI: oai:DiVA.org:ri-2457DiVA, id: diva2:960047
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2018-08-17Bibliographically approved

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Nordberg, Åke

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