Abstract
Numbers of protozoa in the subsurface of aviation gasoline and jet fuel spill areas at a Coast Guard base at Traverse City, Mich., were determined. Boreholes were drilled in an uncontaminated location, in contaminated but untreated parts of the fuel plumes, and in the aviation gasoline source area undergoing H2O2 biotreatment. Samples were taken from the unsaturated zone to depths slightly below the floating free product in the saturated zone. Protozoa were found to occur in elevated numbers in the unsaturated zone, where fuel vapors mixed with atmospheric oxygen, and below the layer of floating fuel, where uncontaminated groundwater came into contact with fuel. The same trends were noted in the biotreatment area, except that numbers of protozoa were higher. Numbers of protozoa in some contaminated areas equalled or exceeded those found in surface soil. The abundance of protozoa in the biotreatment area was high enough that it would be expected to significantly reduce the bacterial community that was degrading the fuel. Little reduction in hydraulic conductivity was observed, and no bacterial fouling of the aquifer was observed during biotreatment.
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Selected References
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- Balkwill D. L., Ghiorse W. C. Characterization of subsurface bacteria associated with two shallow aquifers in oklahoma. Appl Environ Microbiol. 1985 Sep;50(3):580–588. doi: 10.1128/aem.50.3.580-588.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Harvey R. W., George L. H. Growth determinations for unattached bacteria in a contaminated aquifer. Appl Environ Microbiol. 1987 Dec;53(12):2992–2996. doi: 10.1128/aem.53.12.2992-2996.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Madsen E. L., Sinclair J. L., Ghiorse W. C. In situ biodegradation: microbiological patterns in a contaminated aquifer. Science. 1991 May 10;252(5007):830–833. doi: 10.1126/science.2028258. [DOI] [PubMed] [Google Scholar]
- Shaw J. C., Bramhill B., Wardlaw N. C., Costerton J. W. Bacterial fouling in a model core system. Appl Environ Microbiol. 1985 Mar;49(3):693–701. doi: 10.1128/aem.49.3.693-701.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sinclair J. L., Ghiorse W. C. Distribution of protozoa in subsurface sediments of a pristine groundwater study site in oklahoma. Appl Environ Microbiol. 1987 May;53(5):1157–1163. doi: 10.1128/aem.53.5.1157-1163.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Vandevivere P., Baveye P. Effect of bacterial extracellular polymers on the saturated hydraulic conductivity of sand columns. Appl Environ Microbiol. 1992 May;58(5):1690–1698. doi: 10.1128/aem.58.5.1690-1698.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]