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Main Title Biodegradation of Aromatic Hydrocarbons by Aquifer Microorganisms under Denitrifying Conditions.
Author Hutchins, S. R. ; Sewell, G. W. ; Kovacs, D. A. ; Smith, G. A. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;NSI Technology Services Corp., Ada, OK.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/003;
Stock Number PB91-171892
Additional Subjects Biological treatment ; Aquifers ; Biodeterioration ; Oil pollution ; Denitrification ; Water pollution control ; Aquatic microorganisms ; Aromatic hydrocarbons ; Jet engine fuels ; Underground storage ; Storage tanks ; Hazardous materials ; Benzenes ; Toluene ; Xylenes ; Oil spills ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-171892 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
Laboratory tests were conducted to evaluate whether denitrification would be a suitable alternative for biorestoration of an aquifer contaminated with JP-4 jet fuel. Microcosms were prepared from uncontaminated and contaminated aquifer material, amended with nitrate, nutrients, and aromatic hydrocarbons, and incubated under a nitrogen atmosphere at 12 C. With uncontaminated core material, there was no observable lag period prior to removal of toluene whereas 30 days was required before biodegradation commenced for xylenes, ethylbenzene, and 1,2,4-trimethylbenzene. An identical test with contaminated aquifer material exhibited not only much longer lag periods but decreased rates of biodegradation; benzene, ethylbenzene, and o-xylene were not significantly degraded within the 6-month time period even though active denitrification occurred at this time. First-order biodegradation rate constants ranged from 0.016 to 0.38/day for uncontaminated core material and from 0.022 to 0.067/day for contaminated core material. Tests with individual compounds in uncontaminated core indicated that benzene and m-xylene inhibited the basal rate of denitrification. These data demonstrate that several aromatic compounds are degraded under denitrifying conditions, but rates of biodegradation may be lower in material contaminated with JP-4 jet fuel. (Copyright (c) 1990 American Chemical Society.)