In situ air sparging for bioremediation of groundwater and soils
- Biogenie, Inc., Sainte-Foy, Quebec (Canada)
Activities at a former petroleum products depot resulted in the hydrocarbon contamination of soil and groundwater over a 30,000-m{sup 2} area. Site remediation activities consisted of three phases: site-specific characterization and treatability study, pilot-scale testing, and full-scale bioremediation. During Phase 1, a series of site/soil/waste characterizations was undertaken to ascertain the degree of site contamination and to determine soil physical/chemical and microbiological characteristics. Treatability studies were carried out to simulate an air sparging process in laboratory-scale columns. Results indicated 42% mineral oil and grease removal and 94% benzene, toluene, ethylbenzene, and xylenes (BTEX) removal over an 8-week period. The removal rate was higher in the unsaturated zone than in the saturated zone. Phase 2 involved pilot-scale testing over a 550-m{sup 2} area. The radius of influence of the air sparge points was evaluated through measurements of dissolved oxygen concentrations in the groundwater and of groundwater mounding. A full-scale air sparging system (Phase 3) was installed on site and has been operational since early 1994. Physical/chemical and microbiological parameters, and contaminants were analyzed to evaluate the system performance.
- OSTI ID:
- 467730
- Report Number(s):
- CONF-950483--; ISBN 1-57477-003-9
- Country of Publication:
- United States
- Language:
- English
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