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首页> 外文期刊>Environmental Science & Technology: ES&T >Aerobic Bioaugmentation to Decrease Polychlorinated Biphenyl(PCB)Emissions from Contaminated Sediments to Air
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Aerobic Bioaugmentation to Decrease Polychlorinated Biphenyl(PCB)Emissions from Contaminated Sediments to Air

机译：Aerobic Bioaugmentation to Decrease Polychlorinated Biphenyl(PCB)Emissions from Contaminated Sediments to Air

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We conducted experiments to determine whether bioaugmentation with aerobic,polychlorinated biphenyl(PCB)-degrading microorganisms can mitigate polychlorinated biphenyl(PCB)emissions from contaminated sediment to air.Para-burkholderia xenovorans strain LB400 was added to bioreactors containing PCB-contaminated site sediment.PCB mass in both the headspace and aqueous bioreactor compartments was measured using passive samplers over 35 days.Time-series measurements of all 209 PCB congeners revealed a 57% decrease in total PCB mass accumulated in the vapor phase of bioaugmented treatments relative to non-bioaugmented controls,on average.A comparative congener-specific analysis revealed preferential biodegradation of lower-chlorinated PCBs(LC-PCBs)by LB400.Release of the most abundant congener(PCB 4[2,2'-dichlorobiphenyl])decreased by over 90%.Simulations with a PCB reactive transport model closely aligned with experimental observations.We also evaluated the effect of the phytogenic biosurfactant,saponin,on PCB bioavailability and biodegradation by LB400.Time-series qPCR measurements of biphenyl dioxygenase(bphA)genes showed that saponin better maintained bphA abundance,compared to the saponin-free treatment.These findings indicate that an active population of bioaugmented,aerobic PCB-degrading microorganisms can effectively lower PCB emissions and may therefore contribute to minimizing PCB inhalation exposure in communities surrounding PCB-contaminated sites.

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