A long-term field study of in situ bioremediation in a fractured conglomerate trichloroethene source zone

Matthew F. Verce, Victor M. Madrid, Steven D. Gregory, Zafer Demir, Michael J. Singleton, Edmund P. Salazar, Paul J. Jackson, Rolf Halden, Anja Verce

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

An 8-year bioremediation field study was conducted in a trichloroethene (TCE)-contaminated, highly indurated (i.e., hard), recharge-limited (i.e., contains little water) conglomerate where common remediation strategies, such as groundwater recirculation and direct push installation of a large well network, could not be used. A tracer test using isotopically distinct water from the Hetch Hetchy Reservoir indicated that remediation fluids mainly flowed through fractures and sand lenses in the conglomerate. This was confirmed during in situ bioremediation of the site, in which Dehalococcoides (from a bioaugmentation culture) and volatile fatty acids (from injection of lactate) were the most accurate indicators of transport between wells. Some contaminants were also displaced out of the area due to injection of tracer water. Despite these difficulties, dissolved contaminant mass decreased by an estimated 80% by the end of the test, reaching the lowest values ever recorded at this site. Furthermore, the persistence of ethene 4 years after bioaugmentation suggests that the dechlorinating capacity of the remaining microbial community is comparable to the matrix diffusion of TCE into the dissolved phase.

Original languageEnglish (US)
Pages (from-to)18-31
Number of pages14
JournalBioremediation Journal
Volume19
Issue number1
DOIs
StatePublished - Jan 2 2015

Fingerprint

trichloroethylene
bioremediation
conglomerate
remediation
tracer
pollutant
water
ethylene
microbial community
recharge
fatty acid
persistence
well
matrix
sand
groundwater
fluid
in situ
field study
test

Keywords

  • bioremediation
  • Dehalococcoides
  • groundwater
  • isotopes
  • preferential flow
  • rebound
  • rock
  • tracer
  • trichloroethene

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Verce, M. F., Madrid, V. M., Gregory, S. D., Demir, Z., Singleton, M. J., Salazar, E. P., ... Verce, A. (2015). A long-term field study of in situ bioremediation in a fractured conglomerate trichloroethene source zone. Bioremediation Journal, 19(1), 18-31. https://doi.org/10.1080/10889868.2014.978836

A long-term field study of in situ bioremediation in a fractured conglomerate trichloroethene source zone. / Verce, Matthew F.; Madrid, Victor M.; Gregory, Steven D.; Demir, Zafer; Singleton, Michael J.; Salazar, Edmund P.; Jackson, Paul J.; Halden, Rolf; Verce, Anja.

In: Bioremediation Journal, Vol. 19, No. 1, 02.01.2015, p. 18-31.

Research output: Contribution to journalArticle

Verce, MF, Madrid, VM, Gregory, SD, Demir, Z, Singleton, MJ, Salazar, EP, Jackson, PJ, Halden, R & Verce, A 2015, 'A long-term field study of in situ bioremediation in a fractured conglomerate trichloroethene source zone', Bioremediation Journal, vol. 19, no. 1, pp. 18-31. https://doi.org/10.1080/10889868.2014.978836
Verce, Matthew F. ; Madrid, Victor M. ; Gregory, Steven D. ; Demir, Zafer ; Singleton, Michael J. ; Salazar, Edmund P. ; Jackson, Paul J. ; Halden, Rolf ; Verce, Anja. / A long-term field study of in situ bioremediation in a fractured conglomerate trichloroethene source zone. In: Bioremediation Journal. 2015 ; Vol. 19, No. 1. pp. 18-31.
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