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Exploring The Limits Of Aerobic Vinyl Chloride And Cis Dichloroethene Biodegradation Under Suboxic Conditions
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Book Synopsis Exploring the Limits of Aerobic Vinyl Chloride and Cis-dichloroethene Biodegradation Under Suboxic Conditions by : Patrick M. Richards
Download or read book Exploring the Limits of Aerobic Vinyl Chloride and Cis-dichloroethene Biodegradation Under Suboxic Conditions written by Patrick M. Richards and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An improved understanding of VC and cis-DCE biodegradation under low oxygen conditions could increase the efficiency and sustainability of CE remediation and to expand the use of Monitored Natural Attenuation as a remedial alternative. The overall objective of the studies presented here is to better define the role of aerobic VC and cis-DCE degrading bacteria under suboxic conditions, and to provide practical guidance for expanding the role of aerobic CE biodegradation as a site remediation strategy.
Book Synopsis Aerobic Biodegradation of Ethene, Cis-1,2-dichloroethene and Vinyl Chloride in Sediments at the Savannah River Site Sanitary Landfill by : Michael D. Madl
Download or read book Aerobic Biodegradation of Ethene, Cis-1,2-dichloroethene and Vinyl Chloride in Sediments at the Savannah River Site Sanitary Landfill written by Michael D. Madl and published by . This book was released on 2002 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory Evaluation of Natural Attenuation and Enhanced Biodegradation of Trichloroethene, Cis-dichloroethene, and Vinyl Chloride Under Anaerobic Conditions by : William B. Bratt
Download or read book Laboratory Evaluation of Natural Attenuation and Enhanced Biodegradation of Trichloroethene, Cis-dichloroethene, and Vinyl Chloride Under Anaerobic Conditions written by William B. Bratt and published by . This book was released on 2004 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerobic and Anaerobic Transformation of Cis-Dichloroethene (cis-DCE) and Vinyl Chloride (VC): Steps for Reliable Remediation by :
Download or read book Aerobic and Anaerobic Transformation of Cis-Dichloroethene (cis-DCE) and Vinyl Chloride (VC): Steps for Reliable Remediation written by and published by . This book was released on 2003 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable research has focused on the anaerobic transformation of PCE and TCE, two of the most common chlorinated solvents found in groundwater. However, relatively little is known about the types of microorganisms and specific environmental conditions associated with the dechlorination of dichloroethenes (DCEs) and vinyl chloride (VC). For the successful remediation of a contaminated site, the complete reduction to the environmentally benign products (e.g., ethene and inorganic chloride), or complete mineralization must be achieved. Recent research identified four different microbial processes that determine the fate of these compounds in groundwater. These processes include: * Anaerobic energy-yielding reductive dechlorination (chlororespiration) (Process 2) * Anaerobic energy-yielding oxidation (Process 3) * Aerobic cooxidation (Process 4) * Aerobic energy-yielding oxidation (Process 5).
Book Synopsis Mechanisms, Chemistry, and Kinetics of Anaerobic Biodegradation of Cis-dichloroethylene and Vinyl Chloride. 1998 Annual Progress Report by :
Download or read book Mechanisms, Chemistry, and Kinetics of Anaerobic Biodegradation of Cis-dichloroethylene and Vinyl Chloride. 1998 Annual Progress Report written by and published by . This book was released on 1998 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study are to: (1) determine the biochemical pathways for reductive dehalogenation of cis-1,2-dichloroethene (cDCE) and vinyl chloride (VC), including identification of the enzymes involved, (2) determine the chemical requirements, especially the type and quantity of electron donors needed by the microorganisms for reductive dehalogenation, and (3) evaluate the kinetics of the process with respect to the concentration of both the electron donors and the electron acceptors (cDCE and VC). Progress has been made under each of the three primary objectives. One manuscript related to the first objective has been published. Manuscripts related to the other two objectives have been submitted for publication. Findings related to the three objectives are summarized.
Book Synopsis Mechanisms, Chemistry and Kinetics of the Anaerobic Biodegradation of Cis-dichloroethylene and Vinyl Chloride. First Annual Progress Report, September 15, 1996--September 14, 1997 by :
Download or read book Mechanisms, Chemistry and Kinetics of the Anaerobic Biodegradation of Cis-dichloroethylene and Vinyl Chloride. First Annual Progress Report, September 15, 1996--September 14, 1997 written by and published by . This book was released on 1997 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This three-year project is to study the anaerobic biological conversion of cis-1,2- dichloroethene (cDCE) and vinyl Chloride (VC) to ethene. The study is being conducted in three separate phases, the first to better understand the mechanisms involved in cDCE and VC biodegradation, the second to evaluate the chemistry of the processes involved, and the third, to study factors affecting reaction kinetics. Major funding is being provided by the US Department of Energy, but the DuPont Chemical Company has also agreed to directly cost-share on the project at a rate of $75,000 per year for the three year period. Tetrachloroethylene (PCE) and trichloroethylene (TCE) are solvents that are among the most widely occurring organic groundwater contaminants. The biological anaerobic reduction-of chlorinated aliphatic hydrocarbons (CAHs) such as PCE and TCE to cDCE and VC in groundwater was reported in the early 1980s. Further reduction of PCE and its intermediates to ethene was reported in 1989. Several pure cultures of anaerobic bacteria have been found to reductively dehalogenate PCE to cDCE Rates of reduction of PCE and TCE to cDCE are high and the need for electron donor addition for the reactions is small. However, the subsequent reduction of cDCE to VC, and then of VC to the harmless end product, ethene, is much slower and only recently has a pure culture been reported that is capable of reducing cDCE to VC or VC to ethene. There are numerous. reports of such conversions in mixed cultures. The reduction of cDCE and VC to ethene is where basic research is most needed and is the subject of this study.
Book Synopsis Microbial Mineralization of Cis-dichloroethene and Vinyl Chloride as a Component of Natural Attenuation of Chloroethene Contaminants Under Conditions Identified in the Field as Anoxic by : Paul M. Bradley
Download or read book Microbial Mineralization of Cis-dichloroethene and Vinyl Chloride as a Component of Natural Attenuation of Chloroethene Contaminants Under Conditions Identified in the Field as Anoxic written by Paul M. Bradley and published by . This book was released on 2012 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dichloroethene and Vinyl Chloride Degradation Potential in Wetland Sediments at Twin Lakes and Pen Branch, Savannah River National Laboratory, South Carolina by :
Download or read book Dichloroethene and Vinyl Chloride Degradation Potential in Wetland Sediments at Twin Lakes and Pen Branch, Savannah River National Laboratory, South Carolina written by and published by . This book was released on 2007 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of 14C-radiotracer-based microcosm experiments was conducted to assess the mechanisms and products of degradation of dichloroethene (DCE) and vinyl chloride (VC) in wetland sediments at the Department of Energy (DOE) Savannah River National Laboratory. This project investigated the potential for biotic and abiotic DCE and VC degradation in wetland sediments from the Twin Lakes area of the C-BRP investigative unit and from the portion of Pen Branch located directly down gradient from the CMP investigative unit. Substantial degradation of [1,2-14C] DCE and [1,2-14C] VC to 14CO2 was observed in all viable sediment microcosms prepared under oxic conditions. These results indicate that microbial mineralization processes, involving direct oxidation or cometabolic oxidation, are the primary mechanisms of DCE and VC biodegradation in Twin Lake and Pen Branch sediments under oxic conditions. Substantial degradation of [1,2-14C] DCE and [1,2-14C] VC was observed in all viable sediment microcosms incubated under anoxic conditions. Production of 14CO2 was observed in all sediment microcosms under anoxic conditions. In general, the accumulation of mineralization products (14CO2 and 14CH4) was comparable to the accumulation of those reduced daughter products (14C-VC, 14C-ethene or 14C-ethane) traditionally identified with chloroethene reductive dechlorination. These results indicate that microbial mineralization processes can be an important component of DCE and VC degradation in Twin Lake and Pen Branch sediments under anoxic conditions. These results demonstrate that an evaluation of the efficiency of in situ DCE and VC biodegradation in Twin Lakes and Pen Branch that is based solely on the observed accumulation of reduced daughter products may underestimate substantially the total extent of contaminant biodegradation and, thus, the contribution of biodegradation to overall contaminant attenuation.
Book Synopsis Mechanisms, Chemistry, and Kinetics of Anaerobic Biodegradation of Cis-Dichloroethene and Vinyl Chloride by :
Download or read book Mechanisms, Chemistry, and Kinetics of Anaerobic Biodegradation of Cis-Dichloroethene and Vinyl Chloride written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anaerobic biological processes can result in PCE and TCE destruction through conversion to cis-dichloroethene (cDCE) then to vinyl chloride (VC), and finally to ethene. Here, the chlorinated aliphatic hydrocarbons (CAHs) serve as electron acceptors in energy metabolism, requiring electron donors such as hydrogen from an external source. The purpose of this study was to learn more about the biochemistry of cDCE and VC conversion to ethene, to better understand the requirements for electron donors, and to determine factors affecting the rates of CAH degradation and organism growth. The biochemistry of reductive dehalogenation of VC was studied with an anaerobic mixed culture enriched on VC. In other studies on electron donor needs for dehalogenation of cDCE and VC, competition for hydrogen was found to occur between the dehalogenators and other microorganisms such as methanogens and homoacetogens in a benzoate-acclimated dehalogenating methanogenic mixed culture. Factors affecting the relative rates of destruction of the solvents and their intermediate products were evaluated. Studies using a mixed PCE-dehalogenating culture as well as the VC enrichment for biochemical studies suggested that the same species was involved in both cDCE and VC dechlorination, and that cDCE and VC competitively inhibited each other's dechlorination rate.
Book Synopsis Cometabolic and Growth-linked Biodegradation of Vinyl Chloride Under Aerobic Conditions by : Matthew Francis Verce
Download or read book Cometabolic and Growth-linked Biodegradation of Vinyl Chloride Under Aerobic Conditions written by Matthew Francis Verce and published by . This book was released on 2001 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alternatives for Managing the Nation's Complex Contaminated Groundwater Sites by : National Research Council
Download or read book Alternatives for Managing the Nation's Complex Contaminated Groundwater Sites written by National Research Council and published by National Academies Press. This book was released on 2013-02-27 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Across the United States, thousands of hazardous waste sites are contaminated with chemicals that prevent the underlying groundwater from meeting drinking water standards. These include Superfund sites and other facilities that handle and dispose of hazardous waste, active and inactive dry cleaners, and leaking underground storage tanks; many are at federal facilities such as military installations. While many sites have been closed over the past 30 years through cleanup programs run by the U.S. Department of Defense, the U.S. EPA, and other state and federal agencies, the remaining caseload is much more difficult to address because the nature of the contamination and subsurface conditions make it difficult to achieve drinking water standards in the affected groundwater. Alternatives for Managing the Nation's Complex Contaminated Groundwater Sites estimates that at least 126,000 sites across the U.S. still have contaminated groundwater, and their closure is expected to cost at least $110 billion to $127 billion. About 10 percent of these sites are considered "complex," meaning restoration is unlikely to be achieved in the next 50 to 100 years due to technological limitations. At sites where contaminant concentrations have plateaued at levels above cleanup goals despite active efforts, the report recommends evaluating whether the sites should transition to long-term management, where risks would be monitored and harmful exposures prevented, but at reduced costs.
Download or read book Redox written by J. Schüring and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few processes are as important for environmental geochemistry as the interplay between the oxidation and reduction of dissolved and solid species. The knowledge of the redox conditions is most important to predict the geochemical behaviour of a great number of components, the mobilities of which are directly or indirectly controlled by redox processes. The understanding of the chemical mechanisms responsible for the establishment of measurable potentials is the major key for the evaluation and sensitive interpretation of data. This book is suitable for advanced undergraduates as well as for all scientists dealing with the measurement and interpretation of redox conditions in the natural environment.
Book Synopsis Scientific Investigations Report by : Sharon E. Kroening
Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Hydrocarbon and Lipid Microbiology by : Terry McGenity
Download or read book Handbook of Hydrocarbon and Lipid Microbiology written by Terry McGenity and published by Springer. This book was released on 2010-03-01 with total page 4699 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides a comprehensive overview of microbial interactions with the major forms of hydrocarbons, oils, and lipids in or entering the biosphere. It is the definitive resource on the physiological mechanisms and adaptive strategies characteristic of the microbial lifestyle that plays out at hydrophobic material: aqueous liquid interfaces.
Book Synopsis Organohalide-Respiring Bacteria by : Lorenz Adrian
Download or read book Organohalide-Respiring Bacteria written by Lorenz Adrian and published by Springer. This book was released on 2016-08-03 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the current state of knowledge concerning bacteria that use halogenated organic compounds as respiratory electron acceptors. The discovery of organohalide-respiring bacteria has expanded the range of electron acceptors used for energy conservation, and serves as a prime example of how scientific discoveries are enabling innovative engineering solutions that have transformed remediation practice. Individual chapters provide in-depth background information on the discovery, isolation, phylogeny, biochemistry, genomic features, and ecology of individual organohalide-respiring genera, including Dehalococcoides, Dehalogenimonas, Dehalobacter, Desulfitobacterium and Sulfurospirillum, as well as organohalide-respiring members of the Deltaproteobacteria. The book introduces readers to the fascinating biology of organohalide-respiring bacteria, offering a valuable resource for students, engineers and practitioners alike.
Book Synopsis Bioaugmentation for Groundwater Remediation by : Hans F. Stroo
Download or read book Bioaugmentation for Groundwater Remediation written by Hans F. Stroo and published by Springer Science & Business Media. This book was released on 2012-10-02 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a review of the past 10 to 15 years of intensive research, development and demonstrations that have been on the forefront of developing bioaugmentation into a viable remedial technology. This volume provides both a primer on the basic microbial processes involved in bioaugmentation, as well as a thorough summary of the methodology for implementing the technology. This reference volume will serve as a valuable resource for environmental remediation professionals who seek to understand, evaluate, and implement bioaugmentation.
Book Synopsis Aquatic Redox Chemistry by : Paul Tratnyek
Download or read book Aquatic Redox Chemistry written by Paul Tratnyek and published by OUP USA. This book was released on 2012-06-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive overview of aquatic redox chemistry through chapters contributed by many of the leading investigators in the field.
