Bioremediation of PCB-Contaminated Soil at the Y-12 Plant.

摘要

The technical feasibility of bioremediation of soils contaminated with polychlorinated biphenyls (PCBs) was investigated using six in-situ lysimeters and two slurry bioreactors during the summer and fall of 1987. Microbial degradation of PCBs was characterized, and microbial cultures were isolated and characterized. Indigenous microorganisms present in contaminated soils from the floodplain of Bear Creek were shown to be capable of degrading monochlorinated biphenyl. Evidence included production of radiolabeled carbon dioxide from radiolabeled substrate and microbial characterization using gene probes and signature lipid analyses. Evidence was also obtained for dechlorination of highly chlorinated PCBs under laboratory conditions by microbial cultures isolated from other contaminated soils. These results are quite encouraging for further development of bioremediation technologies for PCBs. In-situ treatment of the soils in lysimeters by aeration/mixing and water appeared to stimulate growth of microorganisms and increase the biodegradation of monochlorinated biphenyl in laboratory experiments using soil samples from the lysimeters. The effects of additional nutrients, carbon source, and inocula were unclear from these tests; only one condition for each parameter was tested in the limited number of lysimeters. 12 refs., 11 figs., 14 tabs. (ERA citation 13:057497)