Biodegradation of Jet Fuel in Vented Columns of Water-Unsaturated Sandy Soil
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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The effect of soil water content on the rate of jet fuel JP-4 biodegradation in air-vented, water-unsaturated columns of sandy soil was investigated. The contaminated soil was obtained from a spill site located on Tyndall AFB, Fla. The initial soil loading was 4590 mg of JP-4kg of dry soil. Three laboratory columns were packed with the contaminated soil, saturated and drained for periods of 81-89 days. Two columns were continuously vented with air, and the third, intended to provide an anaerobic control, was vented with nitrogen. The venting gas flows were maintained between 1 and 2.5 soil pore volume changeouts per day. The total JP-4 removal in the air-vented columns averaged 44 of the mass originally present. Biodegradation and volatilization accounted for 93 and 7 of the total removal, respectively. A maximum biodegradation rate of 14.3 mg of JP-4kg of moist soil per day was observed at a soil water content of approximately 72 saturation. Soil drainage characteristics indicated that this water content may have corresponded to 100 of the in situ field capacity water content. Theses.
- Soil Mechanics