Hydrocarbon biodegradation kinetics in an intact unsaturated zone soil core

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:467761

Moyer, E E ^[1]; Ostendorf, D W; Richards, R J; Goodwin, S ^[2]

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1. ENSR Consulting and Engineering, Acton, MA (United States)
2. Univ. of Massachusetts, Amherst, MA (United States)

Aerobic biodegradation of vapor-phase petroleum hydrocarbons was evaluated in an intact soil core from the site of an aviation gasoline release. A mid-depth 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. Steady-state concentrations were input to a simple analytical model balancing advection and first-order biodegradation of hydrocarbons. First-order rate constants for each major hydrocarbon compound were used to calibrate the model to the concentration profiles. 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 microcosm studies at the same field site, suggesting that both estimation methods were effective.

• Sponsoring Organization: Environmental Protection Agency, Washington, DC (United States)
• OSTI ID: 467761
• Report Number(s): CONF-950483--; ISBN 1-57477-003-9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BIODEGRADATION
HYDROCARBONS
IN-SITU PROCESSING
OIL SPILLS
REMEDIAL ACTION