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Mineralogical characterization of scalings formed in geothermal sites in the Upper Rhine Graben before and after the application of sulfate inhibitors

Haas-Nüesch, Ruth 1,2; Heberling, Frank ORCID iD icon 2; Schild, Dieter ORCID iD icon 2; Rothe, Jörg ORCID iD icon 2; Dardenne, Kathy ORCID iD icon 2; Jähnichen, Sabine; Eiche, Elisabeth 1; Marquardt, Christian 2; Metz, Volker 2; Schäfer, Thorsten 2
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)
2 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Scale formation processes in the surface installations of geothermal power plants may have a negative effect on
power plant performance. In addition, scales formed within the geothermal water circuit frequently accumulate
natural radionuclides. Consequently, scale formation may lead to radiation dose rates, which are of radiological
concern, and deposits, which may have to be disposed as radioactive waste. In order to minimize these problems
and to foster geothermal power plant availability, it is of major interest to understand scale formation processes
and to develop methods for their inhibition. One important pre-requisite towards this goal is a sound mineralogical
and geochemical characterization of the formed material.
Geothermal brines at sites in the Upper Rhine Graben are in general highly mineralized and become, upon
cooling in the heat exchanger, supersaturated with respect to sulfate solid-solutions, e.g. (Ba,Sr)SO4, and other
mineral phases. Some geothermal power plants very successfully tested the application of sulfate scaling inhibitors.
Here we present mineralogical analyses of scale samples from geothermal power plants in the Upper
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Postprint §
DOI: 10.5445/IR/1000077988
Veröffentlicht am 09.06.2022
DOI: 10.1016/j.geothermics.2017.10.006
Zitationen: 12
Web of Science
Zitationen: 11
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Nukleare Entsorgung (INE)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 0375-6505, 1879-3576
KITopen-ID: 1000077988
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Weitere HGF-Programme 54.01.01 (POF III, LK 01) ps- und fs-Strahlen
Erschienen in Geothermics
Verlag Elsevier
Band 71
Seiten 264-273
Vorab online veröffentlicht am 16.10.2017
Schlagwörter Geothermal scaling, Sulfate inhibitor, Galena, Elemental lead, Arsenic, Antimony
Nachgewiesen in Dimensions
Web of Science
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