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Front Microbiol. 2016 Feb 09;7:122. doi: 10.3389/fmicb.2016.00122. eCollection 2016.

New Bio-Indicators for Long Term Natural Attenuation of Monoaromatic Compounds in Deep Terrestrial Aquifers.

Frontiers in microbiology

Thomas Aüllo, Sabrina Berlendis, Jean-François Lascourrèges, Daniel Dessort, Dominique Duclerc, Stéphanie Saint-Laurent, Blandine Schraauwers, Johan Mas, Delphine Patriarche, Cécile Boesinger, Michel Magot, Anthony Ranchou-Peyruse

Affiliations

  1. Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie Pour l'Environnement et les Matériaux UMR 5254, Equipe Environnement et Microbiologie Pau, France.
  2. APESA Pau, France.
  3. TOTAL - Centre-Scientifique-Technique-Jean-Feger Pau, France.
  4. STORENGY - Geosciences Department Bois-Colombes, France.
  5. TIGF - Transport et Infrastructures Gaz France Pau, France.

PMID: 26904000 PMCID: PMC4746249 DOI: 10.3389/fmicb.2016.00122

Abstract

Deep subsurface aquifers despite difficult access, represent important water resources and, at the same time, are key locations for subsurface engineering activities for the oil and gas industries, geothermal energy, and CO2 or energy storage. Formation water originating from a 760 m-deep geological gas storage aquifer was sampled and microcosms were set up to test the biodegradation potential of BTEX by indigenous microorganisms. The microbial community diversity was studied using molecular approaches based on 16S rRNA genes. After a long incubation period, with several subcultures, a sulfate-reducing consortium composed of only two Desulfotomaculum populations was observed able to degrade benzene, toluene, and ethylbenzene, extending the number of hydrocarbonoclastic-related species among the Desulfotomaculum genus. Furthermore, we were able to couple specific carbon and hydrogen isotopic fractionation during benzene removal and the results obtained by dual compound specific isotope analysis (

Keywords: BTEX; Desulfotomaculum; deep aquifer; natural attenuation; sulfate-reduction

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