- Author : Yi Liang
- Publisher :
- Release : 2013
- ISBN :
- Pages : 137 pages
Genetic Analyses of Microbial Polychlorinated Biphenyl Degradation in Natural and Engineered Systems
Download or read book Genetic Analyses of Microbial Polychlorinated Biphenyl Degradation in Natural and Engineered Systems written by Yi Liang and published by . This book was released on 2013 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increased abundance of the biphenyl dioxygenase gene, which is indicative of aerobic PCB degradation, and its transcript were observed after bioaugmentation, suggesting active aerobic PCB degradation. To promote the anaerobic PCB degradation, redox cycling (alternating flooding and non-flooding) was performed. Redox cycling was found to improve the removal of PCB 153 in unplanted soils and to increase the dechlorinating Chloroflexi population. Characterization of the microbial community by T-RFLP and clone library revealed that Proteobacteria and Acidobacteria were dominant. Species that contain dechlorination potential were identified, including Geobacter and Clostridium, suggesting that their possible role in PCB dechlorination. The research described in this thesis provides scientific knowledge and evidence for the feasibility of employing bioremediation including natural attenuation, phytoremediation, and bioaugmentation to clean up PCB contamination. Such information will be critical in selecting and optimizing remediation strategies for PCB contaminated sites.