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dc.contributor.authorConthe, Monica
dc.contributor.authorLycus, Pawel Michal
dc.contributor.authorArntzen, Magnus Øverlie
dc.contributor.authorda Silva, Aline Ramos
dc.contributor.authorFrostegård, Åsa
dc.contributor.authorBakken, Lars
dc.contributor.authorKleerebezem, Robbert
dc.contributor.authorLoosdrecht, Mark C.M. van
dc.identifier.citationWater Research. 2018, 151 381-387.nb_NO
dc.description.abstractThe strong greenhouse gas nitrous oxide (N2O) can be emitted from wastewater treatment systems as a byproduct of ammonium oxidation and as the last intermediate in the stepwise reduction of nitrate to N2 by denitrifying organisms. A potential strategy to reduce N2O emissions would be to enhance the activity of N2O reductase (NOS) in the denitrifying microbial community. A survey of existing literature on denitrification in wastewater treatment systems showed that the N2O reducing capacity (VmaxN2O/N2) exceeded the capacity to produce N2O (VmaxNO3/N2O) by a factor of 2e10. This suggests that denitrification can be an effective sink for N2O, potentially scavenging a fraction of the N2O produced by ammonium oxidation or abiotic reactions. We conducted a series of incubation experiments with freshly sampled activated sludge from a wastewater treatment system in Oslo and found that the ratio a ¼ VmaxN2O/N2/VmaxNO3/N2O fluctuated between 2 and 5 in samples taken at intervals over a period of 5 weeks. Adding a cocktail of carbon substrates resulted in increasing rates, but had no significant effect on a. Based on these results e complemented with qPCR and metaproteomic data e we discuss whether the overcapacity to reduce N2O can be ascribed to gene/protein abundance ratios (nosZ/nir), or whether in-cell competition between the reductases for electrons could be of greater importance.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleDenitrification as an N2O sinknb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalWater Researchnb_NO
cristin.unitnameKjemi, bioteknologi og matvitenskap

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal