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Enhancing Reductive Dechlorination Of Chlorinated Ethenes And Ethanes In A Natural Treatment System
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Book Synopsis Enhancing Reductive Dechlorination of Chlorinated Ethenes and Ethanes in a Natural Treatment System by : Caroline Burda
Download or read book Enhancing Reductive Dechlorination of Chlorinated Ethenes and Ethanes in a Natural Treatment System written by Caroline Burda and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessment of Potential for Natural Attenuation of Chlorinated Ethenes and Ethanes in Ground Water at a Petrochemical Reclamation Site, Harris County, Texas by : Glenn F. Huff
Download or read book Assessment of Potential for Natural Attenuation of Chlorinated Ethenes and Ethanes in Ground Water at a Petrochemical Reclamation Site, Harris County, Texas written by Glenn F. Huff and published by . This book was released on 2000 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural Attenuation of Chlorinated Ethenes by Anaerobic Reductive Dechlorination Coupled with Aerobic Cometabolism by : DEREK. VEERKAMP
Download or read book Natural Attenuation of Chlorinated Ethenes by Anaerobic Reductive Dechlorination Coupled with Aerobic Cometabolism written by DEREK. VEERKAMP and published by . This book was released on 1999-03-01 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorinated solvents and their daughter products are the most common contaminants of groundwater at industrial and military facilities in the United States. Limitations of conventional technologies have intensified efforts to find alternative methods to remediate contaminated sites to regulatory goals set by CERCLA. Natural attenuation of chlorinated solvents is a promising alternative to traditional pump and treat methods but has not been well understood or widely accepted. This modeling study investigated the ability of TCE to completely degrade under various aquifer conditions and rate order constants. It also examined a case study of a former landfill site at Moody AFB. We found unusually high flow of ground water by advection or dispersion inhibits the complete degradation of TCE. High concentrations of sulfate or nitrate inhibit the creation of methanogenic conditions and therefore inhibit reductive dechlorination of TCE. We also found an electron donor co-contaminant a critical factor for the complete destruction of TCE because it creates anaerobic conditions. The model illustrated a possible explanation for the lack of down gradient contaminants at the landfill site may be the coupling of reductive dechlorination and cometabolism naturally attenuation the contaminants.
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 Development and Characterization of a Rapid Dechlorinating Enrichment Stimulated from an Aquifer Contaminated with Chlorinated Ethenes and Ethanes by : Haekyung Kim
Download or read book Development and Characterization of a Rapid Dechlorinating Enrichment Stimulated from an Aquifer Contaminated with Chlorinated Ethenes and Ethanes written by Haekyung Kim and published by . This book was released on 2004 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural and Enhanced Remediation Systems by : Suthan S. Suthersan
Download or read book Natural and Enhanced Remediation Systems written by Suthan S. Suthersan and published by CRC Press. This book was released on 2001-08-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of bioremediation and phytoremediation technologies, Natural and Enhanced Remediation Systems explores remediation techniques that use the beneficial effects provided by Mother Nature. Written by a leader in the industry, the book provides state-of-the-art information on natural and enhanced remediation techniques such as mo
Book Synopsis Natural Attenuation of Chlorinated Ethenes by Anaerobic Reductive Dechlorination Coupled with Aerobic Cometabolism by : Derek D. Veerkamp (1LT, USAF.)
Download or read book Natural Attenuation of Chlorinated Ethenes by Anaerobic Reductive Dechlorination Coupled with Aerobic Cometabolism written by Derek D. Veerkamp (1LT, USAF.) and published by . This book was released on 1999 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigations of Reductive Dechlorination Reactions of Chlorinated Ethenes and Ethanes on Zero-valent Metals Using Compound Specific Isotopic Analysis by : Nancy Anne VanStone
Download or read book Investigations of Reductive Dechlorination Reactions of Chlorinated Ethenes and Ethanes on Zero-valent Metals Using Compound Specific Isotopic Analysis written by Nancy Anne VanStone and published by . This book was released on 2006 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reductive dechlorination reactions occurring on zero-valent metal surfaces for chlorinated ethenes and chlorinated ethanes are investigated using compound specific isotopic analysis (CSIA) to measure carbon isotopic fractionation and carbon kinetic isotope effects (KIE). Reductive dechlorination of chlorinated contaminants on zero-valent iron (Fe0) is used for remediation purposes at over 100 sites worldwide employing permeable reactive barrier (PRB) technology. Degradation can occur via 3 main pathways: (1) alpha-elimination, (2) beta-elimination and (3) hydrogenolysis. Experiments documenting carbon isotopic fractionation observed during degradation of a suite of chlorinated ethenes are described, and it is demonstrated that reproducible carbon isotopic fractionation occurs for perchloroethene (PCE), trichloroethene (TCE), cis-dichloroethene (cis-DCE) and vinyl chloride (VC). The results for Fe0 from two different sources show distinct differences in both rates of reaction and isotopic fractionation factors (epsilon), particularly for the cis-DCE and VC. Using ground water samples from pre- and post-treatment of a Fe0 PRB at F.E. Warren Air Force Base, it is established that carbon isotopic fractionation of chlorinated ethenes follows the same principles under field conditions, and it is shown that CSIA, in combination with traditional compositional analysis, can help to resolve complex performance-related problems for PRBs. Finally, it is demonstrated that reaction pathways and mechanisms can be investigated using CSIA and ranges of epsilon and KIE are established for the investigated reactions on different zero-valent metals. In batch experiments monitoring dichloroethane (DCA) degradation on Zn0, CSIA was used to determine that a common rate limiting step occurs for hydrogenolysis and alpha-elimination reactions of 1,1-DCA. As well, overall epsilon and KIE are greater for beta-elimination of 1,2-DCA than for hydrogenolysis and alpha-elimination of 1,1-DCA. The degradation of a chlorinated ethene, cis-DCE, was investigated on Fe0. Direct measurements of epsilon and KIE for hydrogenolysis and beta-elimination were measured using CSIA. It is established that these reactions do not share a rate limiting step, and unique and reproducible carbon isotopic fractionation is associated with each reaction pathway. CSIA has been shown to be a versatile tool, aiding research as both a reliable diagnostic (i.e. identification of degradation) and as a valuable analytical instrument for mechanistic studies.
Book Synopsis Microbial Reductive Dechlorination of Chlorinated Ethenes by : Benjamin Matthew Griffin
Download or read book Microbial Reductive Dechlorination of Chlorinated Ethenes written by Benjamin Matthew Griffin and published by . This book was released on 2003 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biodegradation of Chlorinated Ethenes at a Karst Site in Middle Tennessee by : Thomas Duane Byl
Download or read book Biodegradation of Chlorinated Ethenes at a Karst Site in Middle Tennessee written by Thomas Duane Byl and published by . This book was released on 2000 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Matthew Barrie Willis Publisher :Ann Arbor, Mich. : University Microfilms International ISBN 13 : Total Pages :390 pages Book Rating :4.E/5 ( download)
Book Synopsis Modeling, Optimization and Sensitivity Analysis of Reductive Dechlorination of Chlorinated Ethenes with Microbial Competition in Groundwater by : Matthew Barrie Willis
Download or read book Modeling, Optimization and Sensitivity Analysis of Reductive Dechlorination of Chlorinated Ethenes with Microbial Competition in Groundwater written by Matthew Barrie Willis and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 2000 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis In Situ Remediation of Chlorinated Solvent Plumes by : Hans F. Stroo
Download or read book In Situ Remediation of Chlorinated Solvent Plumes written by Hans F. Stroo and published by Springer Science & Business Media. This book was released on 2010-09-10 with total page 807 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the late 1970s and early 1980s, our nation began to grapple with the legacy of past disposal practices for toxic chemicals. With the passage in 1980 of the Comprehensive Envir- mental Response, Compensation, and Liability Act (CERCLA), commonly known as Sup- fund, it became the law of the land to remediate these sites. The U. S. Department of Defense (DoD), the nation’s largest industrial organization, also recognized that it too had a legacy of contaminated sites. Historic operations at Army, Navy, Air Force, and Marine Corps facilities, ranges, manufacturing sites, shipyards, and depots had resulted in widespread contamination of soil, groundwater, and sediment. While Superfund began in 1980 to focus on remediation of heavily contaminated sites largely abandoned or neglected by the private sector, the DoD had already initiated its Installation Restoration Program in the mid-1970s. In 1984, the DoD began the Defense Environmental Restoration Program (DERP) for contaminated site assessment and remediation. Two years later, the U. S. Congress codified the DERP and directed the Secretary of Defense to carry out a concurrent program of research, development, and demonstration of innovative remediation technologies. As chronicled in the 1994 National Research Council report, “Ranking Hazardous-Waste Sites for Remedial Action,” our early estimates on the cost and suitability of existing techn- ogies for cleaning up contaminated sites were wildly optimistic. Original estimates, in 1980, projected an average Superfund cleanup cost of a mere $3.
Book Synopsis A Field Experiment Evaluating Enhanced Reductive Dechlorination of Chlorinated Solvents in Groundwater by : Eric Rodriguez
Download or read book A Field Experiment Evaluating Enhanced Reductive Dechlorination of Chlorinated Solvents in Groundwater written by Eric Rodriguez and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Symposium on Natural Attenuation of Chlorinated Organics in Ground Water by :
Download or read book Proceedings of the Symposium on Natural Attenuation of Chlorinated Organics in Ground Water written by and published by DIANE Publishing. This book was released on 1996 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Electron Donor Materials Used to Create Subsurface Permeable Reactive Barriers for Enhanced Reductive Dechlorination of Chlorinated Ethenes by : Elizabeth S. Semkiw
Download or read book Evaluation of Electron Donor Materials Used to Create Subsurface Permeable Reactive Barriers for Enhanced Reductive Dechlorination of Chlorinated Ethenes written by Elizabeth S. Semkiw and published by . This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorinated ethenes (CEs) are widespread ground water contaminants, apparently due to their extensive migration from numerous contamination source points. In this study, a long-term field investigation and aquifer microcosm experiments were combined to evaluate the effectiveness of electron donor materials used to create and maintain subsurface permeable reactive barriers (PRBs) for the enhanced in-situ biodegradation of CEs. The laboratory component includes the first side-by-side comparison of electron donor materials dairy whey, lactate syrup, and Hydrogen Release Compound [Registered] (HRC), in which dechlorination rates, fermentation product distributions, and H[subscript 2] production were monitored as measures of substrate efficiency. Field study allowed the first investigation of the long-term efficacy of a full-scale (~300 ft.) when PRB designed to dechlorinate high concentrations of CEs (10[superscript 2]-10[superscript 3] [micro]g/L) migrating from a source zone. The effects of altering substrate loading volume, loading frequency, and injection method on CE distributions are examined. In donor-amended aquifer microcosms, substrate fermentation to slow-degrading organic acids maintained low H[subscript 2] partial pressures that, as previous studies suggest, may give competitive advantage to dechlorinators over hydrogenotrophic methanogens. Whey-amended and lactate-amended microcosms exhibited faster complete dechlorination. Whey-amended microcosms contained the highest percentage of organic acid carbon upon complete dechlorination. Whey's efficiency improved in microcosms prepared with whey-treatment-zone sediment and ground water, due apparently to the growth of native dechlorinators (e.g. Dehalococcoides) and microbial adaptation to whey within the PRB. In the field study, CEs decreased to low ([less than or equal to]10 [micro]g/L) or undetected levels within the PRB, while trichloroethene and cis-dichloroethene treatment-period average concentrations decreased significantly at downgradient points. Improved and sustained dechlorination was observed following injection of 300 kg whey, as a 750 mg/L slurry, with the use of extraction-injection loops. Results indicate whey loading values of 0.2 kg/m[superscript 3] are appropriate under sufficiently reducing conditions. Comparison of whey fermentation product, chemical oxygen demand (COD), and CE trends indicate whey's lifetime was 4-5 months. Based on the longevity of whey and its 2006 average market price, the estimated material cost of a 300-ft whey PRB is $700/year. Cost comparison, based on determinations of carbon flow in donor-amended microcosms, suggests whey is by far the more cost-efficient PRB material.
Book Synopsis Reductive Dechlorination of Chlorinated Ethenes by :
Download or read book Reductive Dechlorination of Chlorinated Ethenes written by and published by . This book was released on 1995 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
