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Effects of Soil Temperature on Biodegradation Rate of Diesel Compounds from a Field Pilot Test Using Hot Air Injection Process  

Park Gi-Ho (Daewoo Institute of Construction Technology)
Shin Hang-Sik (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Park Min-Ho (Daewoo Institute of Construction Technology)
Hong Seung-Mo (Daewoo Institute of Construction Technology)
Ko Seok-Oh (Department of Civil and Environmental Engineering, Kyunghee University)
Publication Information
Journal of Soil and Groundwater Environment / v.10, no.4, 2005 , pp. 45-53 More about this Journal
Abstract
The objective of this study is to evaluate the effects of changes in soil temperature on biodegradation rate of diesel compounds from a field pilot test using hot air injection process. Total remediation time was estimated from in-situ biodegradation rate and temperature for optimum biodegradation. All tests were conducted by measuring in-situ respiration rates every about 10 days on highly contaminated area where an accidental diesel release occurred. The applied remediation methods were hot air injection/extraction process to volatilize and extract diesel compounds followed by a bioremediation process to degrade residual diesels in soils. Oxygen consumption rate varied from 2.2 to 46.3%/day in the range of 26 to $60^{\circ}C$, and maximum $O_2$ consumption rate was observed at $32.0^{\circ}C$. Zero-order biodegradation rate estimated on the basis of oxygen consumption rates varied from 6.5 to 21.3 mg/kg-day, and the maximum biodegradation rate was observed at $32^{\circ}C$ as well. In other temperature range, the values were in the decreasing trend. The first-order kinetic constants (k) estimated from in-situ respiration rates measured periodically were 0.0027, 0.0013, and $0.0006d^{-1}$ at 32.8, 41.1, and $52.7^{\circ}C$, respectively. The estimated remediation time was from 2 to 9 years, provided that final TPH concentration in soils was set to 870 mg/kg.
Keywords
Hot air; Soil temperature; In-situ respiration; TPH; Biodegradation rate;
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