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Aerobic degradation and dechlorination of 2–chlorophenol, 3‐chlorophenol and 4‐chlorophenol by a Pseudomonas pickettii strain

F. FAVA, P.M. ARMENANTE AND D. KAFKEWITZ. 1995. A Gram‐negative aerobic bacterium capable of using 2–chlorophenol (2–CP), 3–chlorophenol (3–CP) and 4–chlorophenol (4–CP) as sole carbon sources was isolated and characterized. The bacterium, designated LD1, was identified to be a Pseudomonas pickettii strain. LD1 was able to totally degrade and dechlorinate 2–CP (initial concentration: 1.51 mmol I‐1), 3–CP (initial concentration: 0.57 mmol I‐1) and 4–CP (initial concentration: 0.75 mmol I‐1) within 30, 30 and 40 h of incubation, respectively, under growing‐cell batch conditions. LD1 was also found to be able to metabolize chlorocatechols in growing‐ and resting‐cell conditions. This suggests that the bacterium degrades monochlorophenols through a chlorocatechol pathway. In addition, LD1 was found to be capable of readily metabolizing other organic compounds such as phenol, benzoic acid, hydroxybenzoic acids and hydroquinone.