In situ closed-loop bioremediation: Rapid closure in a northern climate
- Environmental Science and Engineering, Inc., Raleigh, NC (United States)
- Braun Intertec Corp., Mendota Heights, MN (United States)
In situ closed-loop bioremediation was employed to achieve site closure at a former railyard in Minneapolis, Minnesota. Soil and groundwater were contaminated with gasoline. The closed-loop remediation system design incorporated three downgradient groundwater recovery wells and a low-pressure pipe infiltration gallery. Aboveground treatment of recovered groundwater was provided by a fixed-film bioreactor. The total reported benzene, toluene, ethylbenzene, and xylenes (BTEX)-removal efficiency of the bioreactor ranged from 98.8% to 100%. Concentrations of BTEX components in groundwater wells were reduced by 45% to 98%. The cleanup goals set by the Minnesota Pollution Control Agency were met within the first 6 months of treatment, and the remediation system was shut down after 20 months of operation. This project further demonstrates the effectiveness of reactor-based, closed-loop in situ bioremediation at sites with favorable conditions.
- OSTI ID:
- 490932
- Report Number(s):
- CONF-950483--; ISBN 1-57477-007-1
- Country of Publication:
- United States
- Language:
- English
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