Friederike Marie Luise Grundger

Accelerated methanogenesis from aliphatic and aromatic hydrocarbons under iron- and sulfate-reducing conditions

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Michael Siegert, Federal Institute for Geosciences and Natural Resources
  • ,
  • Danuta Cichocka, Instituut voor Kern- en Stralingsfysica
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  • Steffi Herrmann, Instituut voor Kern- en Stralingsfysica
  • ,
  • Friederike Gründger
  • Stefan Feisthauer, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Hans Hermann Richnow, Helmholtz-Zentrum für Umweltforschung GmbH
  • ,
  • Dirk Springael, Instituut voor Kern- en Stralingsfysica
  • ,
  • Martin Krüger, Federal Institute for Geosciences and Natural Resources

The impact of four electron acceptors on hydrocarbon-induced methanogenesis was studied. Methanogenesis from residual hydrocarbons may enhance the exploitation of oil reservoirs and may improve bioremediation. The conditions to drive the rate-limiting first hydrocarbon-oxidizing steps for the conversion of hydrocarbons into methanogenic substrates are crucial. Thus, the electron acceptors ferrihydrite, manganese dioxide, nitrate or sulfate were added to sediment microcosms acquired from two brackish water locations. Hexadecane, ethylbenzene or 1-13C-naphthalene were used as model hydrocarbons. Methane was released most rapidly from incubations amended with ferrihydrite and hexadecane. Ferrihydrite enhanced only hexadecane-dependent methanogensis. The rates of methanogenesis were negatively affected by sulfate and nitrate at concentrations of more than 5 and 1 mM, respectively. Metal-reducing Geobacteraceae and potential sulfate reducers as well as Methanosarcina were present in situ and in vitro. Ferrihydrite addition triggered the growth of Methanosarcina-related methanogens. Additionally, methane was removed concomitantly by anaerobic methanotrophy. ANME-1 and -2 methyl coenzyme M reductase genes were detected, indicating anaerobic methanotrophy as an accompanying process [Correction added 16 December after online publication: 'methyl coenzyme A' changed to 'methyl coenzyme M' in this sentence]. The experiments presented here demonstrate the feasibility of enhancing methanogenic alkane degradation by ferrihydrite or sulfate addition in different geological settings.

TidsskriftFEMS Microbiology Letters
Sider (fra-til)6-16
Antal sider11
StatusUdgivet - 1 feb. 2011
Eksternt udgivetJa

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