||Biosorption of Dichlorodiphenyltrichloroethane and Hexachlorobenzene in Groundwater and Its Implications for Facilitated Transport.
Lindqvist, R. ;
Enfield, C. G. ;
||Lund Univ. (Sweden). Dept. of Ecology. ;Rice Univ., Houston, TX. Dept. of Environmental Science and Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Chemical water pollutants ;
Ground water ;
Soil microbiology ;
Microbial colony count ;
Liquid chromatography ;
Mathematical models ;
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||The potential for enhanced mobility of hydrophobic pollutants by cotransport with bacteria in saturated soils was evaluated from measurements of biosorption of (14)C-labeled hexachlorobenzene and dichlorodiphenyl-trichloroethane (DDT) to five strains of soil and sewage bacteria. The sorption process could be described by a linear partition equation and appeared to be reversible, but desorption kinetics were slow and/or partly irreversible. The DDT partition coefficients varied with equilibration time, possibly reflecting DDT-induced changes in the physiology of the bacteria. The partition coefficients, normalized to the masses of the bacteria, ranged from 250 to 14,000 for live cells, but the largest coefficients were associated with autoclaved cells of a Pseudomonas sp. The sorptive capacity of the bacterial biomass was greater for DDT than for hexachlorobenzene but was not correlated to overall bacterial hydrophobicity, measured by hydrophobic interaction chromatography. In a column study, 1.2 X 10(9) cells of a Bacillus sp. strain per ml enhanced DDT transport about 8-fold, whereas an advective-dispersive-sorptive equilibrium model for two mobile phases, water and free-living bacteria, suggested a 14-fold enhancement, based on the DDT partition coefficient. The disagreement was in part due to a retarded nonequilibrium movement of the bacteria. (Copyright (c) 1992, American Society for Microbiology.)
||Pub. in Applied and Environmental Microbiology, v58 n7 p2211-2218 Jul 92. See also PB-241 293. Prepared in cooperation with Rice Univ., Houston, TX. Dept. of Environmental Science and Engineering. Sponsored by Robert S. Kerr Environmental Research Lab., Ada, OK.
|NTIS Title Notes
||Reprint: Biosorption of Dichlorodiphenyltrichloroethane and Hexachlorobenzene in Groundwater and Its Implications for Facilitated Transport.
||68D; 57K; 99F
||PC A02/MF A01