Interim results of studies of microbial isomerization of gamma-hexachlorocyclohexane

Engst, R.; Fritsche, W.; Knöll, R.; Kujawa, M.; Macholz, R.; Straube, G.

doi:10.1007/bf02027010

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…In most cases, the -isomer of HCH was found to be least susceptible to microbial dechlorination. In soils contaminated with HCH, rapid degradation of the Rand γ-isomer of HCH was found under aerobic conditions by the microbial population naturally present (5,6,8,(14)(15)(16). In soils contaminated with HCH, rapid degradation of the Rand γ-isomer of HCH was found under aerobic conditions by the microbial population naturally present (5,6,8,(14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%

“…This is probably due to the spatial (all equatorial) arrangement of the chlorine atoms as was postulated by Beurskens et al (). In soils contaminated with HCH, rapid degradation of the α- and γ-isomer of HCH was found under aerobic conditions by the microbial population naturally present ( 5 , 6 , 8 , − . α-HCH in contaminated soil was found to be partially (20−40%) mineralized to CO 2 ().…”

Section: Introductionmentioning

confidence: 99%

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Anaerobic Transformation of β-Hexachlorocyclohexane by Methanogenic Granular Sludge and Soil Microflora

Eekert

Ras

Mentink

et al. 1998

Environ. Sci. Technol.

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β-Hexachlorocyclohexane (β-HCH) was microbiologically transformed under anaerobic conditions by methanogenic granular sludges from upflow anaerobic sludge blanket (UASB) reactors fed with methanol, volatile fatty acids (VFA), or sucrose as substrates. These sludges, which had not priorily been exposed to β-HCH transformed β-HCH to benzene and chlorobenzene. Usually 2-3 times as much benzene as chlorobenzene was formed. The transformation rates ranged from 0.37 to 0.46 β-HCH (g of volatile suspended solids (VSS)) -1 day -1 at 30 °C. β-HCH was not transformed by autoclaved (sterile) sludge, indicating the biotic nature of the reaction. βand also R-HCH present in contaminated soil were both found to be converted to chlorobenzene and benzene upon incubation of the soil under anaerobic conditions. Equal amounts of benzene and chlorobenzene were formed. The results show that β-HCH transforming bacteria are present in different anaerobic environments. This finding may be of importance for the application of anaerobic bioremediation on sites contaminated with HCH isomers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anaerobic Transformation of β-Hexachlorocyclohexane by Methanogenic Granular Sludge and Soil Microflora

Eekert

Ras

Mentink

et al. 1998

Environ. Sci. Technol.

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“…Afterwards the hexane (150ml) was passed through a 2µ sterile filter for separating liquid phase and the grown bacteria, biofilm biomass. The 14 C share on the with 50ml hexane rewashed filters was converted into CO 2 with an incinerator Packard Tri Carb sample oxidizer (Model 306) that was transferred into carbosorb scintillator (Packard) and after injection into a Packard Tri Carb Liquid scintillation spectrometer (Model 3380) quantified [29,30]. The 14 C share in liquid flask phase was quantified by adding 10ml 0.1N NaOH to 20ml of the 150ml hexane extract.…”

Section: (U-14 C)-labelled Hcb Experimentsmentioning

confidence: 99%

Biofilm Surrounded Hexachlorobenzene (HCB) Crystals and Wastewater Purification

Benckiser¹

2020

EIMBO

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Recalcitrant aromatic compounds reach the aerobic, anaerobic Wastewater Treatment Plant (WWTP) units. The outflow is discharged into receiving waters and transported into oceans. Recalcitrant aromatic compounds as Di-n-Butyl Phthalate (DBP) or HCB concerning is asked: can they serve denitrifying bacteria and archaea in WWTPs and oceans as electron donators. A special research program, financed by the German Research Foundation, tried giving an answer by adding effluent of the experimental WWTP, Civil Engineering Department, University Stuttgart, Germany, to triplicated, 50ml of a chloridefree, nitrate mineral salt medium containing 200ml flasks for enriching denitrifying bacteria and archaea. On chloride-free, nitrate containing mineral salt medium agar plates which contained Inter alia DBP or HCB as sole carbon source pure cultures were isolated. The with DBP or HCB as pure cultures received strains B20b1 (DBP) and B8a (HCB) served as inoculum for studying in airtight closed, the nitrate mineral salt medium containing, autoclaved, and with about 10 7 cells of the denitrifying, on DBP or HCB agar growing isolates inoculated flasks degradation success. About DBP has been reported [1], about the U-14 Clabeled HCB experiments under a to 10 or 19 Vol% O 2 adjusted Helium (He) atmosphere is reported here. From the in hexane dissolved added U-14 C-labeled HCB hexane evaporated during flask evacuation and afterwards crystalized HCB covered the bottle bottom. During the 5 months of incubation (30 ᵒC) the as Pseudomonas aeruginosa identified strain B 8a formed around the HCB crystals a biofilm and monthly controlled O 2 , CO 2 , N 2 O and N 2 changes in the flask atmosphere, the from the originally added 156mg HCB as 14 CO 2 released 0.084 ± 0.3mg into the flask headspace, and the 13.26 ± 1.03mg accumulated U-14 C-HCB in cells and biofilm of the 10% O 2 flask variant signalized HCB interactions which are discussed.

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Degradation of Xenobiotics by White Rot Fungi

Higson

1991

Reviews of Environmental Contamination and Toxicology

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Interim results of studies of microbial isomerization of gamma-hexachlorocyclohexane

Cited by 12 publications

References 5 publications

Anaerobic Transformation of β-Hexachlorocyclohexane by Methanogenic Granular Sludge and Soil Microflora

Anaerobic Transformation of β-Hexachlorocyclohexane by Methanogenic Granular Sludge and Soil Microflora

Biofilm Surrounded Hexachlorobenzene (HCB) Crystals and Wastewater Purification

Degradation of Xenobiotics by White Rot Fungi

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