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CHAMPION INTERNATIONAL SUPERFUND SITE, LIBBY MONTANA FIELD PERFORMANCE EVALUATION BIOREMEDIATION UNIT: IN SITU BIOREMEDIATION OF THE UPPER AQUIFER
Citation:
Sims, R. C., J. L. Sims, AND D. L. Sorensen. CHAMPION INTERNATIONAL SUPERFUND SITE, LIBBY MONTANA FIELD PERFORMANCE EVALUATION BIOREMEDIATION UNIT: IN SITU BIOREMEDIATION OF THE UPPER AQUIFER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-97/044, 1997.
Impact/Purpose:
publish information
Description:
The field performance evaluation of the in-situ bioremediation system at Libby, Montana Superfund Site indicated that treatment appears to have occurred in the water phase under the influence of the treatment injection system. Reduced inorganic compounds may have exerted a demand on the oxygen supplied by the peroxide, and some of the oxygen degassed into the unsaturated zone. Contamination remaining in the Upper Aquifer in the form of pure phase represents a potentially significant long term contamination source via transfer of contaminants to the water phase. Detection of high concentrations of contaminants in the area of influence of the treatment (injection) wells after approximately three years (full-scale injection system) and five years (pilot injection system) of treatment may indicate a lack of rapid response in parts of the site to in-situ bioremediation. The laboratory study indicated mineralization of phenanthrene but very little mineralization of pentachlorophenol (PCP). The effects of temperature, oxygen, and mineral nutrients on biodegradation were also evaluated.