Enrichment and properties of an anaerobic mixed culture reductively dechlorinating 1,2,3-trichlorobenzene to 1,3-dichlorobenzene

Article Abstract:

Enrichment cultures inoculated with Rhine River sediment showed reductive dechlorination of di- and tri-chlorobenzene as well as other highly chlorinated benzenes. Reductive dechlorination of tri-chlorobenzene to di-chlorobenzene was was shown to occur optimally between 25 and 30 degrees celcius and at pH 7.2. Lactate and ethanol were suitable substrates, with dechlorination occurring only in the presence of an electron donor. Findings also suggested that different bacteria are present in the sediment catalyzing different dechlorination reactions.

Oxidation-reduction reaction, Oxidation-reduction reactions, River sediments, Chlorobenzene, Chlorobenzenes

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Reductive dechlorination of tetrachloroethene to cis-1,2-dichloroethene by a thermophilic anaerobic enrichment culture

Article Abstract:

Studies with fumarate-grown bacteria cultures have revealed the significant amounts of methanogens. These substances are believed to be the end products of thermophilic anaerobic biodegradation of tetrachloroethene (PCE), an organic solvent used in the dry cleaning of textiles and degreasing of machines. These toxic compounds have been found to contaminate soils and groundwater sources. Methanogenic cultures and acetogenic cultures were found to contain low-performance cometabolic dechlorination of tetrachloroethene to trichloroethene.

Bacteria, Thermophilic, Bacteria, Thermophiles

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Degradation and fate of carbon tetrachloride in unadapted methanogenic granular sludge

Article Abstract:

Methanogenic granular sludge from upflow anaerobic sludge blanket (UASB) reactors and carbon tetrachloride (CT) were used to examine the specific dechlorinating property of unadapted acetogenic and methanogenic bacteria. Degradation of CT by UASB reactors occurred without prior adaptation and the main products formed were CO2 and Cl-. Biological catalysts and abiotic mechanisms may have influenced the degradation of the CT.

Carbon tetrachloride

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