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Toxicity and biodegradation of chlorophenols in anaerobic propionate enrichment culture

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The fate of four trichlorophenols (TCP), six dichlorophenols (DCP), and three monochlorophenols (CP), were studied in anaerobic propionate enrichment systems. TCPs were more toxic than DCPs and CPs; 2,4,5-TCP was most toxic to the propionate users among the 13 chlorophenols studied in this research. Most chlorophenols were dechlorinated reductively to less chlorinated compounds and/or phenol. Dechlorination at the ortho position was observed most frequently. The overall removal of the selected chlorophenols by anaerobic propionate enrichment systems were in the following order: 2,3,5-TCP > 2,3,6-TCP > 3,5-DCP > 2,4-DCP > 2-CP > 3,4-DCP; 2,3-DCP; 2,5-DCP > 3-CP > 2,4,5-TCP > 2,6-DCP > 2,4,6-TCP > 4-CP.
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Keywords: ANAEROBIC TREATMENT; BIODEGRADATION; CHLOROPHENOLS; DECHLORINATION; METHANOGENS; PROPIONATE; TOXIC COMPOUNDS

Document Type: Research Article

Publication date: 1997-07-01

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