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EnglishA PCB dechlorinating community occurring in a contaminated sediment of the Venice lagoon was enriched and characterized under slurry-phase anaerobic conditions by using sterile sediment and water coming from the site in the presence of 5 spiked coplanar PCB congeners at 500 mg/kg. In the primary microcosm, the dechlorination activity started after a five-month lag phase, after which all spiked PCBs were markedly transformed into lower chlorinated congeners with a dechlorination rate of 112±26 Cl/kg of sediment/week. No lag phase and significantly higher dechlorination rates, as well as a marked increase in sulfate-reduction and a progressive decrease in the methanogenic activity, were detected after serial transfers of the culture. Consistently, T-RFLP analysis of 16S rDNA showed a progressive reduction in the complexity of the archaeal community and an enrichment of several eubacterial taxons during the culture transfer process. Preliminary cloning and sequencing operations indicate that sulfate-reducing bacteria are among the forms mostly enriched in the last enrichment culture. This suggests that such a group of bacteria contributes to the PCB dechlorination activity detected.
| Titolo: | Enrichment and characterization of a PCB dechlorinating community in a contaminated sediment of Venice lagoon |
| Autore/i: | ZANAROLI, GIULIO; J. R. Perez Jimenez; L. Y. Young; FAVA, FABIO |
| Autore/i Unibo: | |
| Anno: | 2005 |
| Titolo del libro: | Atti del 7° Convegno FISV - Federazione Italiana Scienze della Vita |
| Pagina iniziale: | D10.2 |
| Pagina finale: | D10.2 |
| Abstract: | A PCB dechlorinating community occurring in a contaminated sediment of the Venice lagoon was enriched and characterized under slurry-phase anaerobic conditions by using sterile sediment and water coming from the site in the presence of 5 spiked coplanar PCB congeners at 500 mg/kg. In the primary microcosm, the dechlorination activity started after a five-month lag phase, after which all spiked PCBs were markedly transformed into lower chlorinated congeners with a dechlorination rate of 112±26 Cl/kg of sediment/week. No lag phase and significantly higher dechlorination rates, as well as a marked increase in sulfate-reduction and a progressive decrease in the methanogenic activity, were detected after serial transfers of the culture. Consistently, T-RFLP analysis of 16S rDNA showed a progressive reduction in the complexity of the archaeal community and an enrichment of several eubacterial taxons during the culture transfer process. Preliminary cloning and sequencing operations indicate that sulfate-reducing bacteria are among the forms mostly enriched in the last enrichment culture. This suggests that such a group of bacteria contributes to the PCB dechlorination activity detected. |
| Data prodotto definitivo in UGOV: | 11-ott-2005 |
| Appare nelle tipologie: | 4.02 Riassunto (Abstract) |
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