Comparison of denitrification induced by various organic substances - reaction rates, microbiology and temperature effect

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dc.contributor.authorOrtmeyer, F.
dc.contributor.authorBegerow, D.
dc.contributor.authorGurreiro, M. A.
dc.contributor.authorWohnlich, S.
dc.contributor.authorBanning, Andre
dc.contributor.funderDeutsche Forschungsgemeinschaften
dc.date.accessioned2021-11-24T12:30:52Z
dc.date.available2021-11-24T12:30:52Z
dc.date.issued2022-11-08
dc.date.updated2021-11-23T14:32:43Z
dc.description.abstractWidespread groundwater pollution with nitrate (NO3−) and the finite and decreasing geogenic NO3− degradation capacity in aquifers require a better understanding of potential treatment methods. This project aimed at exploring and comparing the efficiency of four organic substances as electron donors for heterotrophic denitrification. Circulation column experiments using sediment without NO3− degradation capacity and high agricultural NO3− groundwater were conducted. Acetate, glucose, ascorbic acid, and ethanol were added to these columns in three concentration steps to induce biological denitrification, whereby also temperature dependence of denitrification rates (room temperature and typical groundwater temperature of 10°C) was taken into account. Results show denitrification with all four carbon (C) sources with intensities varying considerably between electron donors. Comparison of the two temperature approaches shows substantial differences between applied organic substances and indicates T as an important variable for denitrification. Ethanol is clearly the most effective electron donor for biodenitrification in groundwater investigated in this study, with a stronger and more effective NO3− degradation at 10°C than at room temperature. In contrast, much higher reaction rates are achieved with glucose at room temperature, compared to 10°C. Denitrification with ascorbic acid is very low at both temperatures; its addition produces biomass which repeatedly led to column clogging. In the entire test series, nitrite (NO2−) accumulation occurred more frequently and in higher concentrations at 10°C. Analysis of microorganisms shows a strong modification in microbial community in reaction to the addition of different organic C as well as between the two temperature approaches.en
dc.description.sponsorshipDeutsche Forschungsgemeinschaft (DFG PE 1673/6-1)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleide2021WR029793en
dc.identifier.citationOrtmeyer, F., Begerow, D., Guerreiro, M. A., Wohnlich, S., & Banning, A. (2021). Comparison of denitrification induced by various organic substances—Reaction rates, microbiology, and temperature effect. Water Resources Research, 57, e2021WR029793 (15 pp). doi: 10.1029/2021WR029793en
dc.identifier.doi10.1029/2021WR029793en
dc.identifier.eissn1944-7973
dc.identifier.endpage15en
dc.identifier.issn0043-1397
dc.identifier.journaltitleWater Resources Researchen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12255
dc.identifier.volume57en
dc.language.isoenen
dc.publisherWileyen
dc.relation.urihttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021WR029793
dc.rights© 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectGroundwater pollutionen
dc.subjectGroundwateren
dc.subjectNitrateen
dc.subjectDenitrificationen
dc.subjectNitrificationen
dc.titleComparison of denitrification induced by various organic substances - reaction rates, microbiology and temperature effecten
dc.typeArticle (peer-reviewed)en
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