Long-term biodegradation of trichloroethylene influenced by bioaugmentation and dissolved oxygen in aquifer microcosms
Article Abstract:
Aquifer microcosms fed with phenol over a 280-day period showed decreasing trichloroethylene (TCE) cometabolism by indigenous microorganisms. They also demonstrated enhanced cometabolism through bioaugmentation with two strains of Burkholderia cepacia. Initially, however, addition of the microorganisms to microcosms led to significant TCE degradation, but later resulted in the eventual depletion of dissolved oxygen and a decline in TCE transformation. Dissolved oxygen levels recovered at the end of bioaugmentation, with those phenol-fed microcosms returning to or even exceeding previous transformation levels. The strains did not seem to account for the recovered TCE degradation in the phenol-fed, formerly bioaugmented microorganisms.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Effects of high pH on arsenic mobility in a shallow sandy aquifer and on aquifer permeability along the adjacent shoreline, Commencement Bay Superfund Site, Tacoma, Washington
Article Abstract:
Arsenic mobility was greatly enhanced by high-pH groundwater, while aquifer permeability has declined near the shore from about 2 mL/g or higher to about 0.2 mL/g as pH increased from 8.5 to 11. These were observed from a groundwater arsenic plume derived from arsenite wastes at a chemical facility in Tacoma, WA, which extends to the shore of the Hylebos Waterway. The plume has high-pH, high-silica concentrations from past disposal of high-pH brines on site. Aquifer sands are cemented near the shore, caused by precipitation reactions which, in turn, have resulted from the mixing of the high-pH, high-silica groundwater with seawater from the waterway.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Stable carbon isotope evidence of biodegradation zonation in a shallow jet-fuel contaminated aquifer
Article Abstract:
Stable carbon isotopes in dissolved inorganic carbon (DIC) provide evidence of the zonation of 13C-depleted hydrocarbon biodegradation processes under the influence of hydrologically controlled electron-acceptor availability. A four-year study of biodegradation zonation in a sandy, noncarbonate shallow aquifer contaminated with jet-fuel petroleum hydrocarbons showed a range from -28 to +11.9% in (delta)13C values in DIC.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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