抄録
Populations of phenol-degrading bacteria in soil and their trichloroethylene (TCE)-degrading capabilities were evaluated to find effective and reasonable in situ bioremediation methods. In eight soil samples, it is observed that bacteria able to grow on inorganic medium including 125 mg·l-1 of phenol accounted for 6 to 20 % of total aerobic heterotrophic bacteria. Further, TCE-degrading capabilities of fourteen phenol-degrading strains including six isolates from the soil samples described above were compared. Under phenol-induced conditions, the majority of the bacteria could reduce 1mg·l-1 of TCE to an undetectable limit, while the rests could not completely remove TCE or at all. However, all the strains with only one exception showed TCE-degrading activity to a certain extent (ultimate TCE removal was 20 to 100%), and their specific degradation rates for TCE corresponded to those for phenol. These results suggest the possibility of TCE removal by in situ biostimulation in the presence of effective native phenol-degrading bacteria.
