A Long-Term Field Study of In Situ Bioremediation in a Fractured Conglomerate Trichloroethene Source Zone

Autor: Anja Verce, Edmund P. Salazar, Paul J. Jackson, Victor M. Madrid, Rolf U. Halden, Matthew F. Verce, Steven D. Gregory, Zafer Demir, Michael J. Singleton
Rok vydání: 2015
Předmět:
Zdroj: Bioremediation Journal. 19:18-31
ISSN: 1547-6529
1088-9868
Popis: 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, t...
Databáze: OpenAIRE
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