Screening and identification of polychlorinated biphenyls degrading bacterium and its application on bioremediation of PCBs-contaminated soil

A bacterium was screened from the sediment of the southern Yellow Sea, which could degrade PCBs as the sole carbon source and was named strain Q. The identification and degradation characteristics of strain Q were studied. The effect and influencing factors of application of strain Q to remedy PCBs-contaminated soil through simulated experiments were also studied in lab. The results showed that the strain was initially identified as the Streptomyces. With the increase of PCBs concentration, the growth of strain Q was inhibited and the removal rate of the PCBs also decreased. The measures such as adding organic nitrogen source, one disturbance every two days, intermediate temperate and high salinity were all conducive to the bioremediation of PCBs-contaminated soil by strain Q. The removal rate of PCBs was higher than forty percent after twenty days. The strain Q was also proved to be halophilic bacterium, which was more suitable for the remediation of PCBs-contaminated soil with high salinity.