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Divergent organohalide-respiring consortia in PCB-contaminated sediments
Mikešová, Martina ; Brennerová, Maria (advisor) ; Uhlík, Ondřej (referee) ; Stachová Sejáková, Zuzana (referee)
This study is focused on one particular group of the halogenated molecules called polychlorinated biphenyls (PCBs) - synthetic, organic compounds derived from biphenyl with bound chlorine atoms. Depending on the position and number of the chlorine atoms, there are theoretically 209 individual PCB congeners. Although PCBs production was brought to a halt thirty years ago, recalcitrance to degradation makes them a major environmental pollutant at a global scale. Large amounts of PCBs were produced in several countries, and former Czechoslovakia belonged to the ten major world producers. Despite the PCB congener resistance to chemical modification, bacterial process of reductive dechlorination, named organohalide respiration (OHR), was shown to be efficient in the dechlorination of extensively chlorinated PCB congeners and a prerequisite step towards their subsequent complete mineralization by aerobic bacteria. In our study, reductive dechlorination of polychlorinated biphenyls (PCBs) was assessed using long term anaerobic microcosms. The microcosms were inoculated with highly contaminated with weathered Delor sediments, sampled from the efflux channel of the former PCB manufacturer Chemko Strazske. After one year of cultivation the chemical analysis showed a degradation of up to 36 % of the highly...
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