Trace element mobility during Corg-enhanced denitrification in two different aquifers

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dc.contributor.authorOrtmeyer, F.
dc.contributor.authorWohnlich, S.
dc.contributor.authorBanning, Andre
dc.contributor.funderRuhr-Universität Bochumen
dc.date.accessioned2021-11-24T12:59:03Z
dc.date.available2021-11-24T12:59:03Z
dc.date.issued2021-06-04
dc.date.updated2021-11-23T14:36:19Z
dc.description.abstractNitrate (NO3−)-polluted groundwater treatment by enhanced denitrification is becoming increasingly important due to rising NO3− concentrations and decreasing degradation capacities in aquifers. Besides evaluating the efficacy of substrates added to trigger denitrification, secondary reactions must be closely monitored. Biodenitrification by applied organic carbon (Corg) can lead to considerable changes in redox potential (Eh) and pH, two decisive parameters for trace element mobility. In this study, two geologically and hydrogeochemically different groundwater catchments important for drinking water production were investigated and compared. Sediments were analyzed for trace elements as well as sulfur (S) and carbon (C) contents. Ongoing hydrogeochemical reactions were evaluated with depth-specific isotope characterization, and the potential for trace element mobilization by Corg addition was determined in column experiments. Results for enhanced denitrification showed up to 3.8 times lower reaction rates with respect to comparable studies, probably due to incomplete formation of the necessary denitrifying bacteria. Concentrations of trace elements such as nickel (Ni) must also be considered when evaluating enhanced denitrification, as these can negatively affect microorganisms. Added ethanol led to Ni concentrations dropping from 0.013 mg/L to below the detection limit. Thus, Corg addition may not only induce denitrification, but also lead to the immobilization of previously released trace elements.en
dc.description.sponsorshipRuhr-Universität Bochum (Open Access Publication Funds of the Ruhr-University Bochum)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid1589en
dc.identifier.citationOrtmeyer, F., Wohnlich, S. and Banning, A. (2021) 'Trace element mobility during Corg-enhanced denitrification in two different aquifers', Water, 13 (11), 1589 (23 pp). doi: 10.3390/w13111589en
dc.identifier.doi10.3390/w13111589en
dc.identifier.endpage23en
dc.identifier.issn2073-4441
dc.identifier.issued11en
dc.identifier.journaltitleWateren
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12257
dc.identifier.volume13en
dc.language.isoenen
dc.publisherMDPIen
dc.relation.urihttps://www.mdpi.com/2073-4441/13/11/1589/htm
dc.rights© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).en
dc.rights.urihttps:// creativecommons.org/licenses/by/ 4.0/en
dc.subjectBiodenitrificationen
dc.subjectGroundwateren
dc.subjectIsotope characterizationen
dc.subjectOrganic carbonen
dc.subjectSediment analysisen
dc.subjectTrace element mobilizationen
dc.titleTrace element mobility during Corg-enhanced denitrification in two different aquifersen
dc.typeArticle (peer-reviewed)en
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