Reductive dechlorination of PCB-contaminated raisin river sediments by anaerobic microbial granules
✍ Scribed by M. R. Natarajan; J. Nye; W.-M. Wu; H. Wang; M. K. Jain
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 117 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0006-3592
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✦ Synopsis
A polychlorinated biphenyl (PCB)-dechlorinat-pond sediments has been studied extensively and reing anaerobic microbial consortium, developed in a grancently reviewed ular form, demonstrated extensive dechlorination of . Attempts to isolate stable PCBs present in Raisin River sediments at room (20Њ to PCB-dechlorinating anaerobic microorganisms for bio-22ЊC) and at a relatively low (12ЊC) temperature. Highly augmentation or further microbiological studies were chlorinated PCB congeners were dechlorinated and less chlorinated compounds were produced. The homolog unsuccessful. In some instances, enrichments of either comparison showed that tri-, tetra-, penta-, hexa-, and pure or mixed cultures were found to lose their activity heptachlorobiphenyl compounds decreased signifiwhen transferred to another matrix (Champine et al., cantly, and mono-and dichlorobiphenyl compounds in-1995;.
creased. After 32 weeks of incubation at 12ЊC, the predom-Both higher and lower chlorinated PCBs can be effecinant less chlorinated products included 2-, 4-, 2-2/26-, 24-, 2-4-, 24-2-, 26-2-, and 26-4-CB. Among these, 24-and tively dechlorinated and degraded by anaerobic and 24-2-CB did not accumulate at room temperature, sugaerobic sequential processes, respectively (Abramogesting a further dechlorination of these congeners. Pre- wicz, 1990; dominantly meta dechlorination (i.e., pattern M) was cata-1995; . Therefore, in a two-step process, lyzed by the microbial consortium in the granules.
highly chlorinated PCBs were first dechlorinated to less Dechlorination in the control studies without granules was not extensive. This study is the first demonstration chlorinated compounds under anaerobic conditions. In of enhanced reductive dechlorination of sediment PCBs addition, aerobic microorganisms oxidatively dechloriby an exogenous anaerobic microbial consortium.