Use of exogenous specialized bacteria in the biological detoxification of a dump site-polychlorobiphenyl-contaminated soil in slurry phase conditions
- Univ. of Bologna (Italy). Dept. of Applied Chemistry and Material Science
The possibility of biologically detoxifying a contaminated soil from an Italian dump site containing about 1500 mg/kg (in dry soil) of polychlorinated biphenyls was studied in the laboratory in this work. The soil, which contained indigenous aerobic bacteria capable of growing on biphenyl or on monochlorobenzoic acids at concentration of about 300 CFU per g of air-dried soil, was amended with inorganic nutrients, saturated with water and treated in aerobic 3-L batch slurry reactors (soil suspension at 20% w/v). Either Pseudomonas sp. CPE1 strain, capable of cometabolizing low-chlorinated biphenyls into chlorobenzoic acids, or a bacterial coculture capable of aerobically dechlorinating polychlorobiphenyls constituted by this bacterium and the two chlorobenzoic acid degrading bacteria Pseudomonas sp. CPE2 strain and Alcaligenes sp. CPE3 strain, were used as inocula, in the absence and in the presence of biphenyl (4 g/kg of air dried soil). Significant soil polychlorobiphenyl depletions were observed in all the reactors after 119 days of treatment. The soil inoculation with the sole CPE1 was found to slightly enhance the polychlorobiphenyl depletions (about 20%) and the soil detoxification; the effect was higher in the presence of biphenyl.
- OSTI ID:
- 6168692
- Journal Information:
- Biotechnology and Bioengineering, Vol. 64:2; ISSN 0006-3592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIODEGRADATION
BIOREACTORS
ITALY
POLYCHLORINATED BIPHENYLS
REMEDIAL ACTION
SOILS
AROMATICS
CHEMICAL REACTIONS
CHLORINATED AROMATIC HYDROCARBONS
DECOMPOSITION
DEVELOPED COUNTRIES
EUROPE
HALOGENATED AROMATIC HYDROCARBONS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
WESTERN EUROPE
540250* - Environment
Terrestrial- Site Resource & Use Studies- (1990-)