Bacterial reduction of toxic hexavalent chromium using a fed-batch culture of Enterobacter cloacae strain HOl

Fujii, Eijiro; Toko, Kiyoshi; Ohtake, Hisao

doi:10.1016/0922-338x(90)90246-s

Cited by 36 publications

(9 citation statements)

References 4 publications

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“…Various methods such as oxygen sparging, physical removal (e.g., dredging), chemical treatment, and burial have been used to try to remediate metal contaminated environments (Fujii et al 1990;Spindler 1997). Most of these methodologies are not only expensive, but are also often environmentally detrimental.…”

Section: Introductionmentioning

confidence: 99%

Natural Attenuation of Cr(VI) Contamination in Laboratory Mesocosms

Arias

Obraztsova

Tebo

et al. 2003

Geomicrobiology Journal

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The processes leading to the natural attenuation of hexavalent chromium (Cr(VI)) in marine systems are not well understood. To determine the rate at which Cr(VI) could be reduced and the effect of Cr(VI) on bacterial communities in marine sediments, we performed mesocosm experiments with 37.85 L aquaria containing San Diego Bay sandy sediments and seawater. Constant levels of 0, 0.25 (low), and 1.5 mM (high) Cr(VI) were maintained in the water column for 2 months. Chemical analyses of sediment cores taken from the mesocosms indicated that Cr accumulated in the upper 5 mm of the sandy sediments. In general, the distribution of total Cr did not correlate with Fe, Mn, or total organic carbon. Enrichment cultures of metal (iron and chromium)-and sulfate-reducing bacteria from the upper horizon (0-5 mm) of sediments were performed to look for the potential contributors in the detoxification/removal process. PCR of 16S rRNA genes and denaturing gradient gel electrophoresis (DGGE) was used to examine the microbial community structure in sediment depth profiles. When Cr(VI) was present, the number of DGGE bands decreased only in the upper 5 mm of sediments indicating an inhibition of certain bacterial populations and/or a selection for Cr-resistant bacteria in this region. Analysis of the DGGE bands was not especially helpful as most sequences were related to unknown, unidentified, or uncharacterized bacterial cloned sequences.

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Section: Introductionmentioning

confidence: 99%

Natural Attenuation of Cr(VI) Contamination in Laboratory Mesocosms

Arias

Obraztsova

Tebo

et al. 2003

Geomicrobiology Journal

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“…Microbial reduction of toxic hexavalent chromium to less soluble trivalent form as a normal function of their metabolism seems to be a potential method for the remediation of Cr(VI) contamination. 0304 Many microbes have been reported to reduce Cr(VI) under either aerobic or anaerobic conditions [5][6][7][8][9][10][11][12][13][14]. In addition some species are capable of reducing Cr(VI) both aerobically and anaerobically depending on the oxidation reduction potential (ORP) of the environment [15,16].…”

Section: Introductionmentioning

confidence: 99%

Bioremediation of Cr(VI) in contaminated soils

Krishna

Philip

2005

Journal of Hazardous Materials

138

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“…Various organic pollutants such as aromatic can be exploited by bacteria as electron sources for chromate reduction 204,205 resulting in the simultaneous decontamination of organics and chromium. A chromatereducing strain of Enterobacter cloacae was found to be resistant to high levels of chromate (10 mM) and to reduce CrO 4 2 − to the insoluble Cr 3+ form 206 . Both fed-batch and dialysis reactors have been proposed for remediation processes exploiting this bacterium 207 .…”

Section: Other Metal Transformations Of Bioremediation Significancementioning

confidence: 99%

Bioremediation of Heavy Metal Pollution Exploiting Constituents, Metabolites and Metabolic Pathways of Livings. A Review

Kotrba

Ruml

2000

Collect. Czech. Chem. Commun.

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Removal of heavy metals from the soil and water or their remediation from the waste streams "at source" has been a long-term challenge. During the recent era of environmental protection, the use of microorganisms for the recovery of metals from waste streams as well as employment of plants for landfill applications has generated growing attention. Many studies have demonstrated that both prokaryotes and eukaryotes have the ability to remove metals from contaminated water or waste streams. They sequester metals from soils and sediments or solubilize them to aid their extraction. The proposed microbial processes for bioremediation of toxic metals and radionuclides from waste streams employ living cells and non-living biomass or biopolymers as biosorbents. Microbial biotransformation of metals or metalloids results in an alteration of their oxidation state or in their alkylation and subsequent precipitation or volatilization. Specific metabolic pathways leading to precipitation of heavy metals as metal sulfides, phosphates or carbonates possess significance for possible biotechnology application. Moreover, the possibility of altering the properties of living species used in heavy metal remediation or constructing chimeric organisms possessing desirable features using genetic engineering is now under study in many laboratories. The encouraging evidence as to the usefulness of living organisms and their constituents as well as metabolic pathways for the remediation of metal contamination is reviewed here. A review with 243 references.

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Bacterial reduction of toxic hexavalent chromium using a fed-batch culture of Enterobacter cloacae strain HOl

Cited by 36 publications

References 4 publications

Natural Attenuation of Cr(VI) Contamination in Laboratory Mesocosms

Natural Attenuation of Cr(VI) Contamination in Laboratory Mesocosms

Bioremediation of Cr(VI) in contaminated soils

Bioremediation of Heavy Metal Pollution Exploiting Constituents, Metabolites and Metabolic Pathways of Livings. A Review

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