Reductive dechlorination of all trichloro- and dichlorobenzene isomers

Bosma, Tom N. P.; Meer, Jan Roelof van der; Schraa, G.; Tros, M.E.; Zehnder, Alexander J. B.

doi:10.1111/j.1574-6968.1988.tb02668.x

Cited by 99 publications

(57 citation statements)

References 19 publications

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“…There was no evidence for further reduction of 1,3,5-TrCBz. In contrast, Bosma et al (1988) observed reductive dechlorination of all tri-and dichlorobenzene isomers in anaerobic sediment columns.…”

Section: Degradation Of Halogenated Benzenesmentioning

confidence: 64%

Degradation of halogenated aromatic compounds

1990

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Due to their persistence, haloaromatics are compounds of environmental concern. Aerobically, bacteria degrade these compounds by mono- or dioxygenation of the aromatic ring. The common intermediate of these reactions is (halo)catechol. Halocatechol is cleaved either intradiol (ortho-cleavage) or extradiol (meta-cleavage). In contrast to ortho-cleavage, meta-cleavage of halocatechols yields toxic metabolites. Dehalogenation may occur fortuitously during oxygenation. Specific dehalogenation of aromatic compounds is performed by hydroxylases, in which the halo-substituent is replaced by a hydroxyl group. During reductive dehalogenation, haloaromatic compounds may act as electron-acceptors. Herewith, the halosubstituent is replaced by a hydrogen atom.

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Section: Degradation Of Halogenated Benzenesmentioning

confidence: 64%

Degradation of halogenated aromatic compounds

1990

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“…The inhibition of ethane production by 1,2-DCA is probably due to competition of the two chlorinated compounds for the same electrons. Such a dechlorination pattern, where the dechlorination of a lower chlorinated compound is inhibited by the higher chlorinated compound, has also been observed in mixed microbial systems like sewage sludge or soil for as well aromatic compounds (Suflita et al 1982;Boyd & Shelton 1984;Mikesell & Boyd 1986;Bosma et al 1988) as aliphatic compounds (Barrio-Lage et al 1986;Parsons & Lage 1985;Vogel & McCarty 1985). These sequential dechlorination reactions in pure cultures and in mixed microbial systems indicate that the dechlorination pattern observed in complex communities could also be due to a competition for the same electrons in one kind of organism.…”

Section: Discussionmentioning

confidence: 99%

Reductive dechlorination of 1,2-dichloroethane and chloroethane by cell suspensions of methanogenic bacteria

et al. 1990

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Concentrated cell suspensions of methanogenic bacteria reductively dechlorinated 1,2-dichloroethane via two reaction-mechanisms: a dihalo-elimination yielding ethylene and two hydrogenolysis reactions yielding chloroethane and ethane, consecutively. The transformation of chloroethane to ethane was inhibited by 1,2-dichloroethane. Stimulation of methanogenesis caused an increase in the amount of dechlorination products formed, whereas the opposite was found when methane formation was inhibited. Cells of Methanosarcina barkeri grown on H2/CO2 converted 1,2-dichloroethane and chloroethane at higher rates than acetate or methanol grown cells.

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“…A large number of chlorinated benzene congeners were susceptible to biotransformation under anaerobic conditions in sediment or sand columns (Bosma et al 1988(Bosma et al , 1996Van Der Meer et al 1992). Laboratory columns packed with Rhine River sediments or sand were capable of transforming most congeners of chlorinated benzenes under methanogenic conditions by 90 to over 99% with the exception of CB (Bosma et al 1988(Bosma et al , 1996. CB was the main biotransformation product of DCBs, whereas 1,3-and/or 1,4-DCB were the main biotransformation products of TCBs, TeCBs, QCB and HCB.…”

Section: Biodegradation In Engineered Systemsmentioning

confidence: 97%

Microbial degradation of chlorinated benzenes

2007

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Chlorinated benzenes are important industrial intermediates and solvents. Their widespread use has resulted in broad distribution of these compounds in the environment. Chlorobenzenes (CBs) are subject to both aerobic and anaerobic metabolism. Under aerobic conditions, CBs with four or less chlorine groups are susceptible to oxidation by aerobic bacteria, including bacteria (Burkholderia, Pseudomonas, etc.) that grow on such compounds as the sole source of carbon and energy. Sound evidence for the mineralization of CBs has been provided based on stoichiometric release of chloride or mineralization of (14)C-labeled CBs to (14)CO(2). The degradative attack of CBs by these strains is initiated with dioxygenases eventually yielding chlorocatechols as intermediates in a pathway leading to CO(2) and chloride. Higher CBs are readily reductively dehalogenated to lower chlorinated benzenes in anaerobic environments. Halorespiring bacteria from the genus Dehalococcoides are implicated in this conversion. Lower chlorinated benzenes are less readily converted, and mono-chlorinated benzene is recalcitrant to biotransformation under anaerobic conditions.

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Reductive dechlorination of all trichloro- and dichlorobenzene isomers

Cited by 99 publications

References 19 publications

Degradation of halogenated aromatic compounds

Degradation of halogenated aromatic compounds

Reductive dechlorination of 1,2-dichloroethane and chloroethane by cell suspensions of methanogenic bacteria

Microbial degradation of chlorinated benzenes

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