Enhanced Reductive Dechlorination of TCE in a Basalt Aquifer

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A field evaluation of enhanced reductive dechlorination of trichloroethene (TCE) in groundwater has been in progress since November 1998 to determine whether in situ biodegradation can be significantly enhanced through the addition of an electron donor (lactate). An in situ treatment cell was established in the residual source area of a large TCE plume in a fractured basalt aquifer utilizing continuous ground water extraction approximately 150 meters downgradient of the injection location. After a 1-month tracer test and baseline sampling period, the pulsed injection of lactate was begun. Ground water samples were collected from 11 sampling points on a biweekly ... continued below

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37 Kilobytes pages

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Sorenson, K. S.; Peterson, L. N. & Ely, R. April 1, 1999.

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A field evaluation of enhanced reductive dechlorination of trichloroethene (TCE) in groundwater has been in progress since November 1998 to determine whether in situ biodegradation can be significantly enhanced through the addition of an electron donor (lactate). An in situ treatment cell was established in the residual source area of a large TCE plume in a fractured basalt aquifer utilizing continuous ground water extraction approximately 150 meters downgradient of the injection location. After a 1-month tracer test and baseline sampling period, the pulsed injection of lactate was begun. Ground water samples were collected from 11 sampling points on a biweekly basis and in situ water quality parameters were recorded every 4 hours at two locations. Within 2 weeks after the initial lactate injection, dissolved oxygen and redox potential were observed to decrease substantially at all sampling locations within 40 m of the injection well. Decreases in nitrate and sulfate concentrations were also observed. Both quantitative in situ rate estimation methods and qualitative measures such as changes in redox conditions, decreases in chlorine number, and changes in biomass indicator parameters are being used throughout the test to evaluate the extent to which biodegradation of TCE is enhanced.

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37 Kilobytes pages

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OSTI as DE00009805

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  • In Situ and On-Site Bioremediation, San Diego, CA (US), 09/19/1999--04/22/1999

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  • Report No.: INEEL/CON-99-00244
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 9805
  • Archival Resource Key: ark:/67531/metadc792990

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  • April 1, 1999

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  • Dec. 19, 2015, 7:14 p.m.

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  • July 13, 2017, 11:25 a.m.

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Sorenson, K. S.; Peterson, L. N. & Ely, R. Enhanced Reductive Dechlorination of TCE in a Basalt Aquifer, article, April 1, 1999; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc792990/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.