Method for in situ or ex situ bioremediation of hexavalent chrom

Details Method for in situ or ex situ bioremediation of hexavalent chrom Method for in situ or ex situ bioremediation of hexavalent chrom

1995-05-25

1997-10-28

Paden, Carolyn

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Destruction of hazardous or toxic waste

435253, C12N 120

Patent

active

056817398

ABSTRACT:
A method of reducing the concentration of Cr(VI) in a liquid aqueous residue comprises the steps of providing anaerobic Cr(VI) reducing bacteria, mixing the liquid aqueous residue with a nutrient medium to form a mixture, and contacting the mixture with the anaerobic Cr(VI) reducing bacteria such that Cr(VI) is reduced to Cr(III). The anaerobic Cr(VI) reducing bacteria appear to be ubiquitous in soil and can be selected by collecting a soil sample, diluting the soil sample with a sterile diluent to form a diluted sample, mixing the diluted sample with an effective amount of a nutrient medium and an effective amount of Cr(VI) to form a mixture, and incubating the mixture in the substantial absence of oxygen such that growth of Cr(VI) sensitive microorganisms is inhibited and growth of the anaerobic Cr(VI) reducing bacteria is stimulated. A method of in situ bioremediation of Cr(VI) contaminated soil and/or groundwater is also disclosed.

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"Chromium Remediated by Biological Treatment", Egnineering and Mining Journal, Aug. 1994 (Maclean Hunger Publishing Company (1994).
Witmer, Charlotte, "Panel Discussion: Exposure, Remediation, and Related Research Needs", Environmental Health Perspectives, vol. 92, pp. 139-140 (1991).

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