Effect of subsurface electrical heating and steam injection on the indigenous microbial community

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Since the potential for contaminant bioremediation in steam treated subsurface environments has not been explored, the thermal remedial treatment of a gasoline spill at Lawrence Livermore National Laboratory`s (LLNL) Livermore site provided an opportunity to study microbial community changes in the subsurface environment. Many terrestrial microorganisms die or become metabolically inactive if heated for a sufficient time at temperatures of 62-100{degrees}C thus thermal remediation techniques are expected to significantly alter the microbial community structure. We studied changes in community structure and population abundance as well as the characteristics of indigenous heat-tolerant microorganisms before and after steam treatment. Using fatty acid ... continued below

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8 p.

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Krauter, P.; MacQueen, D.; Horn, J. & Bishop, D. November 1, 1995.

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Description

Since the potential for contaminant bioremediation in steam treated subsurface environments has not been explored, the thermal remedial treatment of a gasoline spill at Lawrence Livermore National Laboratory`s (LLNL) Livermore site provided an opportunity to study microbial community changes in the subsurface environment. Many terrestrial microorganisms die or become metabolically inactive if heated for a sufficient time at temperatures of 62-100{degrees}C thus thermal remediation techniques are expected to significantly alter the microbial community structure. We studied changes in community structure and population abundance as well as the characteristics of indigenous heat-tolerant microorganisms before and after steam treatment. Using fatty acid profiles from culturable microorganisms obtained from sediment cores before and after thermal treatment, a 90-98% decline in total microorganism populations in hot subsurface sediments (up to 94{degrees}C) was found. Surviving heat-tolerant microorganisms were found to possess elevated concentrations of saturated fatty acids in their lipid membranes. We also observed that some heat-tolerant microorganisms were capable of degrading gasoline compounds.

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8 p.

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OSTI as DE96010702

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  • SPECTRUM `96: international conference on nuclear and hazardous waste management, Seattle, WA (United States), 18-23 Aug 1996

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  • Other: DE96010702
  • Report No.: UCRL-JC--122299
  • Report No.: CONF-960804--25
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 251605
  • Archival Resource Key: ark:/67531/metadc667229

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 19, 2015, 10:13 p.m.

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Krauter, P.; MacQueen, D.; Horn, J. & Bishop, D. Effect of subsurface electrical heating and steam injection on the indigenous microbial community, article, November 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc667229/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.