Microbial hexachlorobenzene dechlorination under three reducing conditions
The potential dechlorination of hexachlorobenzene (HCB) in medium by 1,2,3-trichlorobenzene (TCB)-adapted mixed culture under three reducing conditions was investigated. It was found that strongest to weakest HCB dechlorination occurred in the order of methanogenic conditions > sulfate-reducing c...
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| Veröffentlicht in: | Chemosphere (Oxford) 1998-06, Vol.36 (13), p.2721-2730 |
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| creator | Chang, Bea-Ven Su, Chung-Jen Yuan, Shaw-Ying |
| description | The potential dechlorination of hexachlorobenzene (HCB) in medium by 1,2,3-trichlorobenzene (TCB)-adapted mixed culture under three reducing conditions was investigated. It was found that strongest to weakest HCB dechlorination occurred in the order of methanogenic conditions > sulfate-reducing conditions > denitrifying conditions. Under denitrifying conditions, no dechlorination was observed during the first 20 days of incubation. Biotransformation occurred in this order: HCB → pentachlorobenzene (PCB) → 1,2,3,5-tetrachlorobenzene (TeCB) → 1,3,5-TCB + 1,2,4-TCB → 1,3-dichlorobenzene (DCB). HCB dechlorination was delayed following treatment with ferric chloride and manganese dioxide, but enhanced by the addition of lactate and pyruvate under methanogenic or sulfate-reducing conditions; the addition of acetate had no significant effect on HCB dechlorination under any of the three reducing conditions. Sequential dechlorination was observed at concentrations of 2–50 mg/L, but a significantly slower rate at the highest concentrations. |
| doi_str_mv | 10.1016/S0045-6535(97)10231-4 |
| format | Article |
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It was found that strongest to weakest HCB dechlorination occurred in the order of methanogenic conditions > sulfate-reducing conditions > denitrifying conditions. Under denitrifying conditions, no dechlorination was observed during the first 20 days of incubation. Biotransformation occurred in this order: HCB → pentachlorobenzene (PCB) → 1,2,3,5-tetrachlorobenzene (TeCB) → 1,3,5-TCB + 1,2,4-TCB → 1,3-dichlorobenzene (DCB). HCB dechlorination was delayed following treatment with ferric chloride and manganese dioxide, but enhanced by the addition of lactate and pyruvate under methanogenic or sulfate-reducing conditions; the addition of acetate had no significant effect on HCB dechlorination under any of the three reducing conditions. Sequential dechlorination was observed at concentrations of 2–50 mg/L, but a significantly slower rate at the highest concentrations.</description><identifier>ISSN: 0045-6535</identifier><identifier>EISSN: 1879-1298</identifier><identifier>DOI: 10.1016/S0045-6535(97)10231-4</identifier><identifier>PMID: 9745704</identifier><identifier>CODEN: CMSHAF</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Biodegradation of pollutants ; Biodegradation, Environmental ; Biological and medical sciences ; Biological and physicochemical properties of pollutants. Interaction in the soil ; Biotechnology ; Chlorides ; Chlorobenzenes - chemistry ; Environment and pollution ; Exact sciences and technology ; Ferric Compounds - chemistry ; Fundamental and applied biological sciences. Psychology ; Fungicides, Industrial - chemistry ; Hexachlorobenzene - chemistry ; Industrial applications and implications. 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It was found that strongest to weakest HCB dechlorination occurred in the order of methanogenic conditions > sulfate-reducing conditions > denitrifying conditions. Under denitrifying conditions, no dechlorination was observed during the first 20 days of incubation. Biotransformation occurred in this order: HCB → pentachlorobenzene (PCB) → 1,2,3,5-tetrachlorobenzene (TeCB) → 1,3,5-TCB + 1,2,4-TCB → 1,3-dichlorobenzene (DCB). HCB dechlorination was delayed following treatment with ferric chloride and manganese dioxide, but enhanced by the addition of lactate and pyruvate under methanogenic or sulfate-reducing conditions; the addition of acetate had no significant effect on HCB dechlorination under any of the three reducing conditions. Sequential dechlorination was observed at concentrations of 2–50 mg/L, but a significantly slower rate at the highest concentrations.</description><subject>Applied sciences</subject><subject>Biodegradation of pollutants</subject><subject>Biodegradation, Environmental</subject><subject>Biological and medical sciences</subject><subject>Biological and physicochemical properties of pollutants. Interaction in the soil</subject><subject>Biotechnology</subject><subject>Chlorides</subject><subject>Chlorobenzenes - chemistry</subject><subject>Environment and pollution</subject><subject>Exact sciences and technology</subject><subject>Ferric Compounds - chemistry</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Fungicides, Industrial - chemistry</subject><subject>Hexachlorobenzene - chemistry</subject><subject>Industrial applications and implications. 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Interaction in the soil</topic><topic>Biotechnology</topic><topic>Chlorides</topic><topic>Chlorobenzenes - chemistry</topic><topic>Environment and pollution</topic><topic>Exact sciences and technology</topic><topic>Ferric Compounds - chemistry</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Fungicides, Industrial - chemistry</topic><topic>Hexachlorobenzene - chemistry</topic><topic>Industrial applications and implications. 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It was found that strongest to weakest HCB dechlorination occurred in the order of methanogenic conditions > sulfate-reducing conditions > denitrifying conditions. Under denitrifying conditions, no dechlorination was observed during the first 20 days of incubation. Biotransformation occurred in this order: HCB → pentachlorobenzene (PCB) → 1,2,3,5-tetrachlorobenzene (TeCB) → 1,3,5-TCB + 1,2,4-TCB → 1,3-dichlorobenzene (DCB). HCB dechlorination was delayed following treatment with ferric chloride and manganese dioxide, but enhanced by the addition of lactate and pyruvate under methanogenic or sulfate-reducing conditions; the addition of acetate had no significant effect on HCB dechlorination under any of the three reducing conditions. Sequential dechlorination was observed at concentrations of 2–50 mg/L, but a significantly slower rate at the highest concentrations.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><pmid>9745704</pmid><doi>10.1016/S0045-6535(97)10231-4</doi><tpages>10</tpages></addata></record> |
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| subjects | Applied sciences Biodegradation of pollutants Biodegradation, Environmental Biological and medical sciences Biological and physicochemical properties of pollutants. Interaction in the soil Biotechnology Chlorides Chlorobenzenes - chemistry Environment and pollution Exact sciences and technology Ferric Compounds - chemistry Fundamental and applied biological sciences. Psychology Fungicides, Industrial - chemistry Hexachlorobenzene - chemistry Industrial applications and implications. Economical aspects Manganese Compounds - chemistry Methanobacterium Oxides - chemistry Pollution Soil and sediments pollution Sulfur-Reducing Bacteria |
| title | Microbial hexachlorobenzene dechlorination under three reducing conditions |
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