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1. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source | |||
ZHANG Shiyang,WANG Xiaoli,ZHU Ruili,Li Hui,WANG Ping,YANG Jie,LIN Kuangfei,GU Jidong,LIU Yongdi | |||
Environmental Science and Techology 04 June 2014 | |||
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Abstract:In this study, a bacterial community was enriched to aerobically degrade trichloroethylene (TCE) by using hydrogen peroxide (H2O2) as the sole oxygen source. The enriched bacterial community could degrade 120 mg/L TCE within 12 d in the presence of 8 mM H2O2, which was found to be the optimum concentration, and the efficiency of TCE degradation reached up to 80.6%. The bacterial community adapted to 2-8 mM H2O2 by increasing the activities of key enzymes, including catalase, superoxide dismutase, and peroxidase. 16S rRNA gene cloning and sequencing showed that the dominant species in the community belonged to Bordetella, Stenotrophomonas, Sinorhizobium, Variovorax, and Sphingobium. Polymerase chain reaction analysis revealed that phenol hydroxylase (Lph) gene was involved in TCE degradation in the presence of H2O2. Phenol induced the bacterial Lph gene, which catalyzed epoxidation of TCE. Our study findings might contribute to the in situ bioremediation of TCE-contaminated groundwater. | |||
TO cite this article:ZHANG Shiyang,WANG Xiaoli,ZHU Ruili, et al. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source[OL].[ 4 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4599609 |
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