Biodegradation

, Volume 18, Issue 5, pp 625–636

Benzene oxidation under sulfate-reducing conditions in columns simulating in situ conditions

  • Carsten Vogt
  • Stefan Gödeke
  • Hanns-Christian Treutler
  • Holger Weiß
  • Mario Schirmer
  • Hans-Hermann Richnow
Original Paper
  • 332 Downloads

Abstract

The oxidation of benzene under sulfate-reducing conditions was examined in column and batch experiments under close to in situ conditions. Mass balances and degradation rates for benzene oxidation were determined in four sand and four lava granules filled columns percolated with groundwater from an anoxic benzene-contaminated aquifer. The stoichiometry of oxidized benzene, produced hydrogen carbonate and reduced sulfate correlated well with the theoretical equation for mineralization of benzene with sulfate as electron acceptor. Mean retention times of water in four columns were determined using radon (222Rn) as tracer. The retention times were used to calculate average benzene oxidation rates of 8–36 μM benzene day−1. Benzene-degrading, sulfide-producing microcosms were successfully established from sand material of all sand filled columns, strongly indicating that the columns were colonized by anoxic benzene-degrading microorganisms. In general, these data indicate a high potential for Natural Attenuation of benzene under sulfate-reducing conditions at the field site Zeitz. In spite of this existing potential to degrade benzene with sulfate as electron acceptor, the benzene plume at the field site is much longer than expected if benzene would be degraded at the rates observed in the column experiment, indicating that benzene oxidation under sulfate-reducing conditions is limited in situ.

Keywords

Benzene Degradation Natural attenuation Sulfate-reducing conditions 

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Carsten Vogt
    • 1
  • Stefan Gödeke
    • 2
  • Hanns-Christian Treutler
    • 3
  • Holger Weiß
    • 2
  • Mario Schirmer
    • 4
  • Hans-Hermann Richnow
    • 1
  1. 1.Department of Isotope BiogeochemistryHelmholtz Centre for Environmental Research - UFZLeipzigGermany
  2. 2.Department of Groundwater RemediationHelmholtz Centre for Environmental Research - UFZLeipzigGermany
  3. 3.Department of Analytical ChemistryHelmholtz Centre for Environmental Research - UFZLeipzigGermany
  4. 4.Department of HydrogeologyHelmholtz Centre for Environmental Research - UFZLeipzigGermany

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