Download or read book Assessment of in Situ Reductive Dechlorination of Polychlorinated Biphenyls PCBs as a Monitored Natural Attenuation Process in Contaminated Sediment from Lake Hartwell South Carolina written by Usarat Pakdeesusuk and published by . This book was released on 2002 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Risk Management Strategy for PCB Contaminated Sediments written by National Research Council and published by National Academies Press. This book was released on 2001-06-07 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a risk-based framework for developing and implementing strategies to manage PCB-contaminated sediments at sites around the country. The framework has seven stages, beginning with problem definition, continuing through assessment of risks and management options, and ending with an evaluation of the success of the management strategy. At the center of the framework is continuous and active involvement of all affected parties-particularly communities-in the development, implementation, and evaluation of the management strategy. A Risk-Management Strategy for PCB-Contaminated Sediments emphasizes the need to consider all risks at a contaminated site, not just human health and ecological effects, but also the social, cultural, and economic impacts. Given the controversy that has arisen at many PCB-contaminated sites, this book provides a consistent, yet flexible, approach for dealing with the many issues associated with assessing and managing the risks at Superfund and other contaminated sites.
Download or read book Collaborative Research Microbal Reductive Dechlorination of Polychlorinated Biphenyls PCBs in Estuarine and Marine Coastal Sediments written by and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many years researchers have tried to identify and monitor PCB dechlorinating bacteria. Strains o-17 and DF-1 are the first PCB dechlorinating bacteria to be identified. These organisms have proven to be very difficult to grow in pure culture thus far. However, for the first time molecular approaches (165 rDNA analysis) has ben combined with enrichment culture technique to identify these organisms. This is a significant breakthrough that will advance the application of bioremediation and it proves that such an approach can be used to identify difficult to culture environmental microorganisms, which is to say most microorganisms. Now for the first time these organisms can be monitored in order to better understand their physiology and to track the organisms in situ, before, during and after active and passive remediation attempts.
Download or read book Biostimulation of Polychlorinated Biphenyl pcb Dechlorination in Sediments of Escambia Bay Florida written by Brittany Elise Young and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Polychlorinated biphenyls (PCBs) contaminate the sediments of Escambia Bay in Pensacola, Florida. Given the right conditions anaerobic bacteria in sediments are capable of degrading PCBs by dechlorinating the molecule. The objective of this study is to assess, in the laboratory, conditions that may stimulate the naturally occurring bacteria in Escambia Bay to degrade the PCBs. The study may have implications for in situ treatment of contaminated sediments like these in Escambia Bay. Sediments were treated with three different electron donors (pyruvate, iron sulfide and elemental iron) that would stimulate the microbes to use the PCBs as an electron acceptor. Each treatment was tested in triplicate and allowed to dechlorinate for five months in an anaerobic environment. After five months, all three treatments resulted in a decrease in PCB concentration in sediment spiked with 2,3'4,4'5-pentachlorobiphenyl (congener 118) and in sediment spiked with Aroclor 1254. Unspiked PCB contaminated sediments showed a less consistent decrease in total PCB concentration for the various treatments. These results show that the bacteria found in Escambia Bay sediments can be stimulated to remediate the PCB contamination. Further research could develop this method into a viable in situ remediation strategy to address the contamination in Escambia Bay.
Download or read book Natural and Induced Transformations of Polychlorinated Biphenyls PCBs in Sediments written by Douglas B. McLaughlin and published by . This book was released on 1994 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment Quality and Polychlorinated Biphenyls in the Lower Neponset River Massachusetts and Implications for Urban River Restoration written by Robert F. Breault and published by . This book was released on 2004 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial Reductive Dechlorination of Polychlorinated Biphenyls PCBs in Anaerobic Freshwater Sediments written by Qingzhong Wu and published by . This book was released on 1996 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of rates and extent of dechlorination in PCB contaminated sediments during monitored natural recovery written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Polychlorinated Biphenyls PCBs in Sediment and Biota written by Lynda Webster and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technology Alternatives for the Remediation of PCB contaminated Soil and Sediment written by B. Dávila and published by . This book was released on 1994 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Polyethylene Passive Sampling to Assess Transport of Polychlorinated Biphenyls PCBs Between Contaminated Sediments Water and Biota written by Jennifer Nicole Apell and published by . This book was released on 2017 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polychlorinated biphenyls (PCBs), which were a widely used group of chemicals before their manufacture was banned in 1979 in the United States, still contaminate numerous aquatic systems. Although there are ongoing efforts to remediate these sites, our ability to implement effective remediation strategies has been hindered by a limited understanding of how PCBs are transported in the environment as well as how they bioaccumulate into aquatic animals. Investigations of contaminated sites often rely on sediment measurements since PCB concentrations are highest in the sediment phase. However, previous research has shown that sediment concentrations are a poor predictor of contaminant fate and effects, whereas freely dissolved water concentrations were able to predict the extent of bioaccumulation and the onset of toxicological effects more accurately. Additionally, the concentration gradient between the porewater (i.e., the interstitial water in sediment beds) and the overlying water is thought to be a major driver in PCB transport from the sediment bed. Passive samplers, which are made of polymers like polyethylene (PE), accumulate PCBs when they are deployed into environmental media, can be used to estimate freely dissolved water concentrations. When used in the laboratory by mixing with sediment samples, they provide a measure of the sediment-water equilibrium porewater concentration. When deployed in the field, they can provide measures of the in situ porewater and overlying water concentrations. In this work, PE samplers were deployed at two Superfund sites contaminated with PCBs to investigate if in situ porewater and sediments were at equilibrium with each other. In situ porewater concentrations were consistently found to be lower than equilibrium concentrations at both sites, an effect that was likely caused by water flow through the sediment bed. At one of the sites, measurements of a geochemical tracer also showed that the exchange of porewater with overlying water was occurring and that the transport of PCBs from sediments was affected by more than just the concentration gradient. Lastly, the sorptive disequilibria between environmental media and the spatial heterogeneity of contamination were shown to affect the extent of bioaccumulation in aquatic animals at one of the sites.
Download or read book Rates of Microbial Dechlorination of Polychlorinated Biphenyls PCBs in Anaerobic Sediments from Waukegan Harbor by J B Risatti Prepared for the Illinois Hazardous Waste Research and Information Center written by James Bruno Risatti and published by . This book was released on 1992 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reductive Dechlorination of Polychlorinated Biphenyls PCBS in Marine Harbor Sediments written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the first time reductive dechlorination of PCBs was shown to occur in marine and estuarine microcosms from sites with ambient temperatures below 10 degrees centigrade. It was shown that the types of activities are influenced by the location of the site and the ambient temperature. In addition, it is now clear that non-indigenous dechlorinating organisms can be added to sediments microcosms to dechlorinate PCBs. These studies suggest that reductive dechlorination of PCBs has the potential to occur in coastal regions with lower ambient temperatures. The result also suggest that active biotreatment of PCB impacted dredge spoils by augmentation may be possible in colder climates.
Download or read book PCB in Water written by Water Resources Scientific Information Center and published by . This book was released on 1973 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Influencing the Development of a Biostimulant for the In Situ Anaerobic Dechlorination of Polychlorinated Biphenyls in Fox River Wisconsin Sediments written by WC. Boyle and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polychlorinated biphenyl (PCB) contaminated sediments were collected from the Fox River, Wisconsin, and analyzed for the possible occurrence of reductive dechlorination. Evidence of in-situ dechlorination was observed. However, the extent of this in-situ dechlorination was less than that typically reported in the literature, suggesting that stimulation of further dechlorination was possible.
Download or read book Polychlorinated Biphenyls PCB written by United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Fisheries and Wildlife Conservation and the Environment and published by . This book was released on 1976 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Public Health Assessment for Bloomington PCB Sites Bloomington Monroe County Indiana Spencer Owen County Indiana written by and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
