Dechlorination of polychlorinated biphenyl congeners by an anaerobic microbial consortium |
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Authors: | M R Natarajan W-M Wu J Nye H Wang L Bhatnagar M K Jain |
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Institution: | (1) MBI International, 3900 Collins Road, P. O. Box 27609, Lansing, MI 48909–0609, USA. Fax: (517) 337–2122 e-mail: jain@mbi.org, US |
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Abstract: | An anaerobic methanogenic microbial consortium, developed in a granular form, exhibited extensive dechlorination of defined
polychlorinated biphenyl (PCB) congeners. A 2,3,4,5,6-pentachlorobiphenyl was dechlorinated to biphenyl via 2,3,4,6-tetrachlorobiphenyl,
2,4,6-trichlorobiphenyl, 2,4-dichlorobi-phenyl and 2-chlorobiphenyl (CB). Removal of chlorine atoms from all three positions
of the biphenyl ring, i.e., ortho, meta and para, was observed during this reductive dechlorination process. Biphenyl was identified as one of the end-products of the reductive
dechlorination by GC-MS. After 20 weeks, the concentrations of the dechlorination products 2,4,6-CB, 2,4-CB, 2-CB and biphenyl
were 8.1, 41.2, 3.0 and 47.8 μM respectively, from an initial 105 μM 2,3,4,5,6-CB. The extent and pattern of the dechlorination
were further confirmed by the dechlorination of lightly chlorinated congeners including 2-CB, 3-CB, 4-CB, 2,4-CB and 2,6-CB
individually. This study indicates that the dechlorination of 2,3,4,5,6-CB to biphenyl is due to ortho, meta and para dechlorination by this anaerobic microbial consortium.
Received: 30 April 1996 / Received revision: 26 July 1996 / Accepted: 5 August 1996 |
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