Petroleum hydrocarbon bioventing kinetics determined in soil core, microcosm, and tubing cluster studies
Journal Article
·
· Ground Water Monitoring and Remediation
Aerobic biodegradation of vapor-phase petroleum hydrocarbons was evaluated in an intact soil core from the site of an aviation gasoline release. An unsaturated zone soil core was subjected to a flow of nitrogen gas, oxygen, water vapor, and vapor-phase hydrocarbons in a configuration analogous to a biofilter or an in situ bioventing or sparging situation. The vertical profiles of vapor-phase hydrocarbon concentration in the soil core were determined by gas chromatography of vapor samples. Biodegradation reduced low influent hydrocarbon concentrations by 45 to 92% over a 0.6-m interval of an intact soil core. The estimated total hydrocarbon concentration was reduced by 75% from 26 to 7 parts per million. Steady-state concentrations were input to a simple analytical model balancing advection and first-order biodegradation of hydrocarbons. First-order rate constants for the major hydrocarbon compounds were used to calibrate the model to the concentration profiles. Rate constants for the seven individual hydrocarbon compounds varied by a factor of 4. Compounds with lower molecular weights, fewer methyl groups, and no quaternary carbons tended to have higher rate constants. The first-order rate constants were consistent with kinetic parameters determined from both microcosm and tubing cluster studies at the field site.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 215594
- Journal Information:
- Ground Water Monitoring and Remediation, Journal Name: Ground Water Monitoring and Remediation Journal Issue: 1 Vol. 16; ISSN 1069-3629; ISSN GWMREV
- Country of Publication:
- United States
- Language:
- English
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