dc.contributor.author | Conthe, Monica | |
dc.contributor.author | Lycus, Pawel Michal | |
dc.contributor.author | Arntzen, Magnus Øverlie | |
dc.contributor.author | da Silva, Aline Ramos | |
dc.contributor.author | Frostegård, Åsa | |
dc.contributor.author | Bakken, Lars | |
dc.contributor.author | Kleerebezem, Robbert | |
dc.contributor.author | Loosdrecht, Mark C.M. van | |
dc.date.accessioned | 2019-02-21T11:54:23Z | |
dc.date.available | 2019-02-21T11:54:23Z | |
dc.date.created | 2019-01-07T18:52:53Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Water Research. 2018, 151 381-387. | nb_NO |
dc.identifier.issn | 0043-1354 | |
dc.identifier.uri | http://hdl.handle.net/11250/2586741 | |
dc.description.abstract | The 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.language.iso | eng | nb_NO |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.title | Denitrification as an N2O sink | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | publishedVersion | nb_NO |
dc.source.pagenumber | 381-387 | nb_NO |
dc.source.volume | 151 | nb_NO |
dc.source.journal | Water Research | nb_NO |
dc.identifier.doi | 10.1016/j.watres.2018.11.087 | |
dc.identifier.cristin | 1651874 | |
dc.relation.project | EC/FP7/316472 | nb_NO |
cristin.unitcode | 192,12,0,0 | |
cristin.unitname | Kjemi, bioteknologi og matvitenskap | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |