Characterization and biotreatability of petroleum contaminated soils in a coral atoll in the Pacific Ocean
- Oak Ridge National Lab., TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
On Kwajalein Island in the Republic of the Marshall Islands, studies were conducted to characterize subsurface petroleum contamination and assess the potential for bioremediation of contaminated soils and sediments. Because of its remote location and problems with shipment of sample materials off-site, characterization and biotreatability studies were conducted on the Island during a 12-d site visit. Analyses were made of soil contamination levels, physical/chemical properties, and microbial densities, while microcosm studies were made of biodegradation potential. It was found that the coral-derived sands on Kwajalein Island were alkaline (e.g., pH > 8) and deficient in nutrients (e.g., low N, P). Microorganisms were abundant (10[sup 3]-10[sup 7] org[center dot]g[sup [minus]1]) and included numerous hydrocarbon degraders. Diesel fuel contamination ranged from below detection limits to nearly 9000 mg TPH kg[sup [minus]1], with the highest levels in the capillary fringe and upper saturated zone of a freshwater lens beneath the island. Biodegradation of fresh diesel fuel added to clean soil occurred very slowly (e.g., < 0.5 mg TPH kg[sup [minus]1]d[sup [minus]1]). Biodegradation of diesel fuel added to previously contaminated soils that were also supplemented with nutrients, proceeded at higher but still relatively low rates (e.g., < 2 mg TPH kg[sup [minus]1] d[sup [minus]1]). It was concluded that bioremediation of diesel fuel contaminated soils by indigeneous organisms was feasible on Kwajalein Island, although degradation rates were very low, with some enhancement possible by the addition of nutrients. 14 refs., 2 figs., 5 tabs.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6762279
- Journal Information:
- Applied Biochemistry and Biotechnology; (United States), Vol. 45-46; ISSN 0273-2289
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DIESEL FUELS
BIODEGRADATION
REMEDIAL ACTION
FEASIBILITY STUDIES
SEDIMENTS
SOILS
CHEMICAL REACTIONS
DECOMPOSITION
DISTILLATES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS OILS
LIQUID FUELS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)