Studies on the bioaccumulation and microbial degradation of 2,3,7,8-tetrachlorodibenzo-p-dioxin.

Matsumura, Fumio; Benezet, Herman J.

doi:10.1289/ehp.7305253

Cited by 33 publications

(14 citation statements)

References 7 publications

(6 reference statements)

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“…Little is known about dioxin degradation by members of another gram-positive phylogenetic group, low G+C gram-positive bacteria (the phylum Firmicutes). Only a few reports are concerned with 2,3,7,8-TCDD degradation by Bacillus megaterium 120,151) . The biosorption of 1,2,3,4-TCDD and various PCDF congeners by Bacillus pumilis was also reported 90) .…”

Section: Aerobic Degradation Processes and Biodiversity Of Bacteria Imentioning

confidence: 99%

“…Earlier biodegradation studies using laboratory soil systems and model ecosystems showed that the concentration of 2,3,7,8-TCDD incorporated into these systems was decreased to some extent due in part to microbial activity 101,120,151,192) . Probably, indigenous microorganisms in polluted soils have the ability to degrade dioxins more or less 12) .…”

Section: Bioremediation Of Polluted Materials and Model Ecosystemsmentioning

confidence: 99%

“…As microorganisms play important roles in the degradation and mineralization of xenobiotic and aromatic compounds in natural environments, biological methods using particular microorganisms or microbial consortia capable of dioxin transformation and degradation have greater appeal than physicochemical ones in their potential application for environmental remediation. Studies on microbial degradation of dioxins started appearing in 1970's 101,120,192) . Since then, large numbers of microorganisms capable of degrading dioxins and related aromatics have been isolated and characterized.…”

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confidence: 99%

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Biodiversity of Dioxin-Degrading Microorganisms and Potential Utilization in Bioremediation.

Hiraishi

2003

Microb. Environ.

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Dioxins are a group of chloroaromatic compounds known to be toxic and carcinogenic, and persistent environmental pollutants. How to remedy dioxin-polluted environments is one of the most challenging problems in environmental technology. From ecological and economical viewpoints, biological methods using particular microorganisms and microbial consortia capable of dioxin transformation and degradation have greater appeal than physicochemical methods in their application for environmental remediation. Large numbers of microorganisms capable of degrading dioxins and dioxin-like compounds have been isolated and characterized. Information about the biodiversity, ecophysiology and molecular biology of dioxin-degrading microorganisms has accumulated particularly during the past decade. There are three major modes of microbial degradation and transformation of dioxins; that is, oxidative degradation by aerobic bacteria containing aromatic hydrocarbon dioxygenases, reductive dechlorination by anaerobic microorganisms and fungal oxidation with cytochrome P-450, lignin peroxidases and laccases. This article overviews the current knowledge of microbial degradation and transformation of dioxins as well as the biodiversity of microorganisms involved. Strategies directed towards the bioremediation of dioxin-polluted environments are discussed.

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Section: Aerobic Degradation Processes and Biodiversity Of Bacteria Imentioning

confidence: 99%

Section: Bioremediation Of Polluted Materials and Model Ecosystemsmentioning

confidence: 99%

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confidence: 99%

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Biodiversity of Dioxin-Degrading Microorganisms and Potential Utilization in Bioremediation.

Hiraishi

2003

Microb. Environ.

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“…It appeared that mixtures of 2,4,5-T were more rapidly degraded than were the single compounds. Very little work has been done on the microbial degradation of TCDD; however, Matsumura and Benezet (1973), have studied the problem. Using 100 microbial strains, they found that only 5 strains showed some ability to degrade the compound.…”

Section: G Microbial Reduction 1 Description Of Actionmentioning

confidence: 99%

Disposition of Orange Herbicide by Incineration. Revised Draft Environmental Statement

WASHINGTON¹

1974

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“…Several papers have appeared on degradation methods for dioxins. [2][3][4][5][6][7][8] However, the ideas or techniques proposed by researchers for the elimination of dioxins do not appear practical, especially in the case of soil pollution. Removal of dioxins should also serve as an effective method for the detoxification of soils, and as a result of removal, some degradation methods might become applicable to the dioxins that have previously been separated from soils.…”

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confidence: 99%

Possible Remediation of Dioxin-Polluted Soil by Steam Distillation.

Mino

Moriyama

2001

CHEMICAL & PHARMACEUTICAL BULLETIN

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2,7-Dichlorodibenzo-p-dioxin (DCDD) was found to evaporate easily with water vapor from a heated solution. Steam distillation was also effective for the removal of DCDD from DCDD-applied soil; its concentration (250 m mg/50 g soil) in the original soil decreased to less than 5% after steam distillation for only 20 min. Actual dioxin-polluted soil in Tokorozawa City was partially decontaminated using the same method. These results suggest that steam distillation could be a new remedial method for soils contaminated with persistent environmental pollutants, such as dioxins and polychlorinated biphenyls.Key words 2,7-dichlorodibenzo-p-dioxin; dioxin; detoxification; steam distillation Dioxins are highly toxic environmental pollutants, mainly generated incidentally in the combustion process of industrial and general waste. In addition to their high toxicity, long-term persistence in the environment is one reason why these pollutants are serious environmental problems.1) To solve this problem, in addition to the elimination of their generation, it is necessary to degrade and/or detoxify the dioxins that have already accumulated in the environment and will continue to be generated in the future. Several papers have appeared on degradation methods for dioxins. [2][3][4][5][6][7][8] However, the ideas or techniques proposed by researchers for the elimination of dioxins do not appear practical, especially in the case of soil pollution. Removal of dioxins should also serve as an effective method for the detoxification of soils, and as a result of removal, some degradation methods might become applicable to the dioxins that have previously been separated from soils.In the course of our study on the chemical degradation of 2,7-dichlorodibenzo-p-dioxin (DCDD) using oxidative reagents, we incidentally found that the added DCDD disappeared rapidly from a heated solution (100°C) and evaporated with steam. Thus we examined whether steam distillation was useful for remediation of dioxin-polluted soil.Our preliminary experiments revealed that DCDD disappeared from the heated solution even without oxidative reagents like H 2 O 2 .9) Therefore we first examined the evaporation of DCDD from a heated aqueous solution (100°C). Figure 1 shows the volatility of DCDD from an aqueous solution during steam distillation using an essential oil testing apparatus, together with the data from soil to which DCDD had been applied.10) Approximately 200 mg of the 250 mg of DCDD applied evaporated from the aqueous solution during the first 10 min, and almost all the remainder was vaporized during the subsequent 10 min. Steam distillation was then applied for the remediation of DCDD-applied model soil. As shown in Fig. 1, the steam distillation of the model soil resulted in almost perfect remediation; the DCDD originally applied was completely recovered in the reservoir of the testing apparatus after 20 min.Next, we attempted to apply the treatment in the detoxification of the actual dioxin-polluted soil in Tokorozawa City. 11) The original dioxin con...

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Studies on the bioaccumulation and microbial degradation of 2,3,7,8-tetrachlorodibenzo-p-dioxin.

Cited by 33 publications

References 7 publications

Biodiversity of Dioxin-Degrading Microorganisms and Potential Utilization in Bioremediation.

Biodiversity of Dioxin-Degrading Microorganisms and Potential Utilization in Bioremediation.

Disposition of Orange Herbicide by Incineration. Revised Draft Environmental Statement

Possible Remediation of Dioxin-Polluted Soil by Steam Distillation.

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