In-situ bioventing and air sparging for remediation of LUST sites
- Dames and Moore Inc., Salt Lake City, UT (United States)
- Wyoming Dept. of Environmental Quality, Lander, WY (United States)
The Wyoming Department of Environmental Quality administers a program for investigation and remediation of leaking underground storage tank (LUST) sites in Wyoming. Soil and groundwater have been contaminated with gasoline and/or diesel at these sites. Minor amounts of free product are present and the contaminated ground water plume extends for large distances downgradient. Geology consists primarily of sands and gravels. Field scale studies and bench tests were conducted to determine the feasibility of soil vapor extraction, bioventing, and air sparging at these sites. Microcosm CO{sub 2} evolution and column bioventing tests were performed on collected soil samples to assess the feasibility of biodegradation and determine the nutrient requirements. Soil vapor extraction/bioventing field scale tests were conducted with horizontal and vertical extraction wells. Air sparging field scale tests were conducted to assess the feasibility of this remediation alternative at several sites. Tests included sites with typical air sparge completions with the screened interval placed approximately 10 to 15 feet below the water table and sites with the screened interval only several feet below the ground water table. Off-gas concentrations produced by air sparging were also measured. The results from the bench scale bioremediation tests indicated that bioventing was feasible to reduce the concentrations of total petroleum hydrocarbons (TPH) and benzene to below the clean-up criteria.
- OSTI ID:
- 124590
- Report Number(s):
- CONF-940499--; ISBN 1-56590-014-6
- Country of Publication:
- United States
- Language:
- English
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