Anaerobic dechlorination and redox activities after full-scale Electrical Resistance Heating (ERH) of a TCE-contaminated aquifer

Friis, Anne Kirketerp; Heron, Gorm; Albrechtsen, Hans‐Jørgen; Udell, Kent S.; Bjerg, Poul Løgstrup

doi:10.1016/j.jconhyd.2006.07.001

Cited by 26 publications

(13 citation statements)

References 24 publications

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“…For example, increased temperatures after heating can heighten metabolic activity and thereby stimulate biological transformation in the vicinity of thermal treatment zones and inside these zones during cool-down, as demonstrated by this study. Furthermore, redox conditions which will be reached after a thermal treatment may be similar to those observed prior to heating, and organic matter can be released during heating which has been demonstrated in closed microcosms (Friis et al 2005;Friis et al 2006b). Although microbial activity and the potential for complete dechlorination to ethene can be decreased or postponed after a thermal treatment (Friis et al 2007a), bioaugmentation can, as shown in this study, be applied to obtain postthermal biodegradation.…”

Section: Implications For Bioremediationmentioning

confidence: 86%

“…Sediment was transferred into diffusion-proof aluminum bags coated inside with Teflon (Friis et al 2005). Groundwater used for all microcosms was sampled at one location (B09) between 6.3 to 8.0 mbs using pre-sterilized and Ar-flushed serum bottles, as previously described (Friis et al 2006b). Location B09 was approximately 10 m downgradient the thermally treated area.…”

Section: Site Description and Samplingmentioning

confidence: 99%

“…After thermal treatments are performed, elevated temperatures and unfavorable geochemical conditions (e.g., more oxic conditions), (Friis et al 2005) which have been reached during heating could limit the survival and activity of microorganisms (Friis et al 2006b). Therefore, there is a need for investigations on the sensitivity of dechlorinating microorganisms in order to establish the optimal time and conditions for bioaugmentation.…”

mentioning

confidence: 99%

“…Previous work focused on redox processes and anaerobic dechlorination in samples heated under controlled conditions in the laboratory (Friis et al 2005(Friis et al , 2007a, and field samples heated by ERH (Friis et al 2006b). In addition, the temperature optima of dechlorination were determined in the diluted mixed culture KB-1 TM (Friis et al 2007b).…”

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confidence: 99%

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Microcosm evaluation of bioaugmentation after field-scale thermal treatment of a TCE-contaminated aquifer

et al. 2007

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This paper investigates effects of combining thermal and biological remediation, based on laboratory studies of trichloroethene (TCE) degradation. Aquifer material was collected 6 months after terminating a full-scale Electrical Resistance Heating (ERH), when the site had cooled from approximately 100 degrees C to 40 degrees C. The aquifer material was used to construct bioaugmented microcosms amended with the mixed anaerobic dechlorinating culture, KB-1(TM), and an electron donor (5 mM lactate). Microcosms were bioaugmented during cooling at 40, 30, 20, and 10 degrees C, as temperatures continually decreased during laboratory incubation. Redox conditions were generally methanogenic, and electron donors were present to support dechlorination. For microcosms bioaugmented at 10 degrees C and 20 degrees C, dechlorination stalled at cis-dichloroethene (cDCE) and vinyl chloride (VC) 150 days after bioaugmentation. However, within 300 days of incubation ethene was produced in the majority of these microcosms. In contrast, dechlorination was rapid and complete in microcosms bioaugmented at 30 degrees C. Microcosms bioaugmented at 40 degrees C also showed rapid dechlorination, but stalled at cDCE with partial VC and ethene production, even after 150 days of incubation when the temperature had decreased to 10 degrees C. These results suggest that sequential bioremediation of TCE is possible in field-scale thermal treatments after donor addition and bioaugmentation and that the optimal bioaugmentation temperature is approximately 30 degrees C. When biological and thermal remediations are to be applied at the same location, three bioremediation approaches could be considered: (a) treating TCE in perimeter areas outside the source zone at temperatures of approximately 30 degrees C; (b) polishing TCE concentrations in the original source zone during cooling from approximately 30 degrees C to ambient groundwater temperatures; and (c) using bioremediation in downgradient areas taking advantages of the higher temperature and potential release of organic matter.

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Section: Implications For Bioremediationmentioning

confidence: 86%

Section: Site Description and Samplingmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Microcosm evaluation of bioaugmentation after field-scale thermal treatment of a TCE-contaminated aquifer

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“…Lower temperatures will also require less infrastructure, because the collection of vapor and NAPL phases can be avoided. Heating to lower temperatures may also enhance microbial activity or promote abiotic degradation, further enhancing remediation Friis et al, 2006;Rossman et al 2006;U.S.EPA, 2004). In addition, low temperature ERH may still take advantage of less aggressive mass removal, since boiling of immiscible mixtures occurs at a temperature below the boiling point of either water or the organic compound; sometimes referred to as the heteroazeotropic boiling point, as it relates to immiscible liquids (Kiva et al, 2003).…”

Section: Low Temperature Erh Subsurface Flow and Transport In Homogementioning

confidence: 99%

In Situ Thermal Remediation of DNAPL Source Zones

Johnson¹,

Tratnyek²,

Sleep³

et al. 2011

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Report Documentation PageForm Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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Groundwater Remediation

Bjerg¹,

Broholm²,

Lemming³

et al. 2012

Encyclopedia of Environmetrics

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This article focuses on off‐site, on‐site, and in situ treatment methods for chlorinated solvent and petroleum hydrocarbon source and plume zones at contaminated sites. Physical remediation methods often include in situ contaminant mass transfer followed by an on‐site treatment. Chemical and biological remediation methods provide contaminant mass destruction, which is preferable. However, physical methods such as thermal remediation technologies have shown very high efficiency within short time frames. The major challenges for chemical and biological methods are contaminations in low‐permeability settings and source zones with dense nonaqueous phase liquids, which cause long remediation time frames. Finally, considerations for choice of remediation technologies and the recent development in the use of decision support tools for environmental comparison of remedial alternatives and their life cycle impacts are addressed.

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Anaerobic dechlorination and redox activities after full-scale Electrical Resistance Heating (ERH) of a TCE-contaminated aquifer

Cited by 26 publications

References 24 publications

Microcosm evaluation of bioaugmentation after field-scale thermal treatment of a TCE-contaminated aquifer

Microcosm evaluation of bioaugmentation after field-scale thermal treatment of a TCE-contaminated aquifer

In Situ Thermal Remediation of DNAPL Source Zones

Groundwater Remediation

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