Natural gradient experiment on transport of jet fuel derived hydrocarbons in an unconfined sandy aquifer |
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Authors: | Maciej R. Kłonowski Gijs D. Breedveld Per Aagaard |
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Affiliation: | (1) Department of Geosciences, University of Oslo, P.O. Box 1047, 0316 Oslo, Norway;(2) Polish Geological Institute, Lower Silesian Branch, Jaworowa 19, 53-122 Wrocław, Poland;(3) Norwegian Geotechnical Institute, P.O. Box 3930, 0806 Oslo, Norway |
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Abstract: | This paper deals with a field experiment, combining the push–pull and tracer tests, conducted under natural gradient conditions at the international Oslo airport. The studied aquifer, showing very complex hydrogeological settings, has been contaminated by a jet fuel spill. The tracer solutes—bromide, toluene, o-xylene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene and naphthalene, have been injected into the plume. Their migration and changes in concentration of the electron acceptors and metabolic by-products have been monitored. Fast removal of both the non-reactive tracer as well as the aromatic organics has been observed. The tracer pulse could only be detected 2 m downgradient from the injection points. At this point, toluene and o-xylene have been completely removed, however, trimethylbenzenes and naphthalene have been detected. Their depletion, based on calculations of available electron acceptors, can, to a large extent, be accounted for intrinsic biodegradation, with Fe(III) and sulphate reductions as the major controlling processes. |
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Keywords: | Groundwater contamination Jet fuel biodegradation Tracer and push– pull tests SE Norway— Gardermoen airport |
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