Monitoring nitrate reduction: hydrogeochemistry and clogging potential in raw water wells.

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dc.contributor.authorOrtmeyer, F.
dc.contributor.authorVolkova, K.
dc.contributor.authorWisotzky, F.
dc.contributor.authorWohnlich, S.
dc.contributor.authorBanning, Andre
dc.date.accessioned2021-11-24T14:20:45Z
dc.date.available2021-11-24T14:20:45Z
dc.date.issued2021-02-05
dc.date.updated2021-11-23T15:12:36Z
dc.description.abstractThe mainly agricultural input of NO3- and compliance with drinking water guideline values pose major challenges for many water suppliers. Additionally, associated changes in hydrochemistry, especially concerning products of NO3- reduction (Fe2+/3+, Mn2+/4+, Ca2+, Mg2+, SO42-, HCO3-) and subsequent reactions, can have a major influence on mineral saturation states and well yield: well productivity can be strongly reduced by mineral precipitation and silting. To evaluate hydrogeochemical evolution and clogging potential for a given well field, thorough hydrochemical and geochemical investigations are required. Therefore, time-dependent and depth-specific ion concentrations in water samples (n = 818) were analysed in a catchment area of a waterworks in western Germany. The sediments of the aquifers were extensively investigated for their geochemistry (CS, scanning electron microscope, aqua regia digestion and dithionite solution; n = 253). In addition, PhreeqC was used to model saturation indices in order to identify possible mineral precipitation in the wells. Results show a high NO3- input into deep wells screened in Tertiary sediments due to an admixture of Quaternary groundwater. Directly at the Quaternary-Tertiary boundary, chemolithotrophic NO3- reduction consuming pyrite occurs. Protons released during the process are pH-buffered by dissolving carbonate minerals. Overall, the hydrochemistry and especially the saturation indices are strongly influenced by NO3- reduction and its degradation products. A change in well yield has not yet been observed, but future clogging by ochre formation or sintering cannot be excluded.en
dc.description.sponsorshipOpen Access funding enabled and organized by Projekt DEALen
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid112en
dc.identifier.citationOrtmeyer, F., Volkova, K., Wisotzky, F., Wohnlich, S. and Banning, A. (2021) ‘Monitoring nitrate reduction: hydrogeochemistry and clogging potential in raw water wells’, Environmental Monitoring and Assessment , 193, 112 (17 pp). doi: 10.1007/s10661-021-08880-yen
dc.identifier.doi10.1007/s10661-021-08880-yen
dc.identifier.endpage17en
dc.identifier.issn1573-2959
dc.identifier.issued3en
dc.identifier.journaltitleEnvironmental Monitoring and Assessmenten
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12260
dc.identifier.volume193en
dc.language.isoenen
dc.publisherSpringeren
dc.relation.urihttps://link.springer.com/article/10.1007%2Fs10661-021-08880-y
dc.rights© The Authors 2021. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International Licenseen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectHydrochemistryen
dc.subjectNitrate degradationen
dc.subjectWell cloggingen
dc.subjectAdmixtureen
dc.subjectGermanyen
dc.titleMonitoring nitrate reduction: hydrogeochemistry and clogging potential in raw water wells.en
dc.typeArticle (peer-reviewed)en
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