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Kinetic Study on Clogging of a Geothermal Pumping Well Triggered by Mixing-Induced Biogeochemical Reactions.
Burté, Luc; Cravotta, Charles A; Bethencourt, Lorine; Farasin, Julien; Pédrot, Mathieu; Dufresne, Alexis; Gérard, Marie-Françoise; Baranger, Catherine; Le Borgne, Tanguy; Aquilina, Luc.
Afiliación
  • Burté L; Géosciences Rennes , Univ Rennes, CNRS , UMR 6118, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Cravotta CA; Antea Group , ZAC du Moulin 803 boulevard Duhamel du Monceau , 45160 Olivet , France.
  • Bethencourt L; U.S. Geological Survey , 215 Limekiln Road. , New Cumberland , Pennsylvania 17070 , United States.
  • Farasin J; Géosciences Rennes , Univ Rennes, CNRS , UMR 6118, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Pédrot M; Écobio , Univ Rennes, CNRS , UMR 6553, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Dufresne A; Géosciences Rennes , Univ Rennes, CNRS , UMR 6118, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Gérard MF; Géosciences Rennes , Univ Rennes, CNRS , UMR 6118, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Baranger C; Écobio , Univ Rennes, CNRS , UMR 6553, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Le Borgne T; Géosciences Rennes , Univ Rennes, CNRS , UMR 6118, Avenue Général Leclerc , F-35042 Rennes Cedex , France.
  • Aquilina L; Antea Group , ZAC du Moulin 803 boulevard Duhamel du Monceau , 45160 Olivet , France.
Environ Sci Technol ; 53(10): 5848-5857, 2019 05 21.
Article en En | MEDLINE | ID: mdl-31038936
The sustainability of ground-source geothermal systems can be severely impacted by microbially mediated clogging processes. Biofouling of water wells by hydrous ferric oxide is a widespread problem. Although the mechanisms and critical environmental factors associated with clogging development are widely recognized, effects of mixing processes within the wells and time scales for clogging processes are not well characterized. Here we report insights from a joint hydrological, geochemical, and metagenomics characterization of a geothermal doublet in which hydrous ferric oxide and hydrous manganese oxide deposits had formed as a consequence of mixing shallow groundwater containing dissolved oxygen and nitrate with deeper, anoxic groundwater containing dissolved iron (FeII) and manganese (MnII). Metagenomics identify distinct bacteria consortia in the pumping well oxic and anoxic zones, including autotrophic iron-oxidizing bacteria. Batch mixing experiments and geochemical kinetics modeling of the associated reactions indicate that FeII and MnII oxidation are slow compared to the residence time of water in the pumping well; however, adsorption of FeII and MnII by accumulated hydrous ferric oxide and hydrous manganese oxide in the well bore and pump riser provides "infinite" time for surface-catalyzed oxidation and a convenient source of energy for iron-oxidizing bacteria, which colonize the surfaces and also catalyze oxidation. Thus, rapid clogging is caused by mixing-induced redox reactions and is exacerbated by microbial activity on accumulated hydrous oxide surfaces.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua Subterránea / Hierro Tipo de estudio: Prognostic_studies Idioma: En Revista: Environ Sci Technol Año: 2019 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua Subterránea / Hierro Tipo de estudio: Prognostic_studies Idioma: En Revista: Environ Sci Technol Año: 2019 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos