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Modeling The Effect Of Nonlinear And Rate Limited Sorption On The Natural Attenuation Of Chlorinated Ethenes
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Book Synopsis Modeling the Effect of Nonlinear and Rate-Limited Sorption on the Natural Attenuation of Chlorinated Ethenes by : Peter P. Feng
Download or read book Modeling the Effect of Nonlinear and Rate-Limited Sorption on the Natural Attenuation of Chlorinated Ethenes written by Peter P. Feng and published by . This book was released on 2000-03-01 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorinated solvents like tetrachloroethene (PCE) and trichloroethene (TCE) are the most common detected groundwater contaminants at Department of Defense installations in the United States. Unfortunately, technologies conventionally used to remediate chlorinated solvent-contaminated groundwater often fall short of achieving regulatory goals. Natural attenuation of chlorinated solvents offers an alternative remediation strategy that may achieve goals. However, the processes involved with natural attenuation are not fully understood, and this lack of understanding has hindered acceptance of natural attenuation by regulatory agencies. This study involved use of a numerical model that incorporated the physical, chemical, and biological processes thought to be relevant to the fate and transport of chlorinated ethenes in the subsurface. The model was used to conduct a parameter sensitivity analysis, to investigate the effect of non-linear and rate-limited sorption processes on the natural attenuation of chlorinated ethenes. The model showed that both rate-limited and non-linear sorption resulted in early arrival of contaminant at wells downgradient of a source area, as well as persistence of contamination at the wells for long periods of time.
Book Synopsis Environmental Impact Assessment of Recycled Wastes on Surface and Ground Waters by : Tarek A. Kassim
Download or read book Environmental Impact Assessment of Recycled Wastes on Surface and Ground Waters written by Tarek A. Kassim and published by Springer Science & Business Media. This book was released on 2005-07-20 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 3: Engineering Modeling and Sustainability. This 3-volume reference presents the latest findings in impact assessment of recycled hazardous waste materials on surface and ground waters. Topics covered include chemodynamics, toxicology, modeling and information systems. The book serves as a practical guide for the monitoring, design, management, or conduct of environmental impact assessment. Each volume contains the table of contents of all volumes.
Book Synopsis Natural Attenuation of Environmental Contaminants by : Andrea Leeson
Download or read book Natural Attenuation of Environmental Contaminants written by Andrea Leeson and published by . This book was released on 2001 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symposium included 600 presentations in 50 sessions on bioremediation and supporting technologies used for a wide range of contaminants already in, or poised to invade, soil, groundwater, and sediment. Three hundred and fifty-two papers were selected and organized into ten volumes. Volume two's articles address the use of natural attenuation to remediate sites with a variety of hydrocarbons and chlorinated compounds contaminating porous media and groundwater. Methods of encouraging naturally occurring microbial activity are discussed, along with sampling, assessment, and long-term monitoring techniques and devices. Articles average eight pages and contain abstracts and references. Annotation copyrighted by Book News Inc., Portland, OR.
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 Modeling Nonlinear Sorption of Trichloroethene in Natural Sorbents with Kerogen by : Zackary William Munger
Download or read book Modeling Nonlinear Sorption of Trichloroethene in Natural Sorbents with Kerogen written by Zackary William Munger and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the subsurface, chlorinated solvent sorption to aquifer materials hinders remediation efforts and makes predicting the transport and fate of chlorinated solvents in groundwater a nontrivial enterprise. Due to heterogeneity in natural sorbents, there is a lack of clear evidence for a sorption model that can reliably simulate sorption behavior across broad aqueous sorbate concentrations on the basis of quantifiable sorbent characteristics. The goal of this study was to test if there is a sorption model that can be shown to be the best choice for simulating trichloroethene (TCE) sorption to natural sorbents and to link the sorption behavior to sorbent characteristics. Sorption isotherms were collected for four natural sorbents from Ontario and New York. The isotherms span an aqueous concentration range nearly five orders of magnitude. The sorbents contain type II kerogen, a common organic constituent in autochthonous marine sedimentary rocks and more recent allochthonous deposits, making them valid model sorbents. These sorption data were fit with 11 isotherm models common in the literature and founded on various partitioning, adsorption, pore-filling, and dual-mode mechanisms including Freundlich, Langmuir, Tóth, and Polanyi-type models. For all examined sorbents the Polanyi or Polanyi-partition models were ranked as the best fit based on the corrected Akaike Information Criterion, suggesting that pore-filling or combined pore-filling and linear partitioning mechanisms are valid for sorbents that contain kerogen. The estimated linear partitioning coefficients for the Polanyi-partition model were within a factor of four of that predicted on the basis of the fraction of organic carbon and an octanol-water partitioning linear free energy relationship. The sorption capacity term was constant within a factor of three when normalized by the fraction of organic carbon. The A and B fitting parameters remained fairly consistent among the studied sorbents. This study demonstrates that the single and dual-mode Polanyi-partition models are the most plausible to describe TCE sorption to sorbents with kerogen and are more accurate across broad aqueous concentrations than commonly used linear and Freundlich models. Model parameters are shown to be related to sorbent characteristics demonstrating the potential for estimating reliable model parameters from measurable sorbent properties.
Book Synopsis Experiment and Modelling of the Competitive Sorption and Transport of Chlorinated Ethenes in Porous Media by : Manuel Alejandro Salaices Avila
Download or read book Experiment and Modelling of the Competitive Sorption and Transport of Chlorinated Ethenes in Porous Media written by Manuel Alejandro Salaices Avila and published by Cuvillier Verlag. This book was released on 2005 with total page 265 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 Quantitative Validation of a Model of Chlorinated Ethene Natural Attenuation by : Harold C. Young
Download or read book Quantitative Validation of a Model of Chlorinated Ethene Natural Attenuation written by Harold C. Young and published by . This book was released on 2001-03-01 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorinated ethenes are among the most prevalent groundwater contaminants at hazardous waste sites nationwide. In an attempt to manage the risks posed by these contaminants, while controlling costs, monitored natural attenuation (MNA) is being considered as a remediation strategy at many sites. MNA relies on naturally occurring physical, chemical, and biological processes in the subsurface to reduce the risk posed by the contamination. The implementation of MNA, however, requires a detailed understanding of these processes, and how they impact contamination at a particular site. One way to gain this understanding is through contaminant fate and transport modeling. In this study, a deterministic model that includes relevant fate and transport processes was applied to a chlorinated ethene-contaminated field site, at which spatial and temporal data had been collected. Parameters used for model input were obtained from the literature, experimental data, and by calibrating the model using concentration data from 1993. The model was then run in a predictive mode, and simulation results were compared to field data from 1999. Model performance was measured by comparison of observed and simulated concentration contour plots and evaluation of goodness-of-fit statistics. Over the six years the model was run in a predictive mode, the model was found to predict contaminant concentrations reasonably well for the three contaminants that were monitored.
Book Synopsis Natural Attenuation by : Godage B. Wickramanayake
Download or read book Natural Attenuation written by Godage B. Wickramanayake and published by . This book was released on 1998 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: - Transformation Processes in Natural Attenuation- Field Characterization/Monitoring for Natural Attenuation- Modeling Natural Attenuation- Natural Attenuation Case Studies- Natural Attenuation of MTBE.
Book Synopsis Natural Attenuation Considerations and Case Studies by : Godage B. Wickramanayake
Download or read book Natural Attenuation Considerations and Case Studies written by Godage B. Wickramanayake and published by . This book was released on 2000 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: - Natural Attenuation Considerations- Natural Attenuation Case Studies I: Chloroethenes- Natural Attenuation Case Studies II: Other Organics and Metals.
Book Synopsis Characterizing the Natural Attenuation Potential of Chlorinated Ethenes Contaminated Sites by : Concepcion Carreon-Diazconti
Download or read book Characterizing the Natural Attenuation Potential of Chlorinated Ethenes Contaminated Sites written by Concepcion Carreon-Diazconti and published by . This book was released on 2006 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Site characterization methods for measuring the occurrence, magnitude, and rate of microbial mediated transformation processes were evaluated to assess the implementation of monitored natural attenuation (MNA) at chlorinated ethenes contaminated sites. A model site in Arizona, the Park-Euclid WQARF site in Tucson, was selected for the study. Field, geochemical, and compound specific carbon isotope fractionation (CSI) data confirm intrinsic biodegradation is occurring in the perched aquifer. Use of the BIOCHLOR model and a screening protocol support the potential for reductive dehalogenation found in the perched aquifer. Biotransformation of tetrachloroethene to cis-1,2-dichloroethene (cis-DCE) was achieved in microcosm studies. Transformation of cis-DCE to vinyl chloride and to ethene is, at the moment, the laboratory rate limiting step. PCR analysis established that the aquifer contains Dehalococcoides sp. and other dechlorinating microorganisms, though genes that encode for enzymes capable of achieving complete dehalogenation of the chlorinated contaminants were confirmed only in one monitoring well. The regional aquifer shows little evidence of intrinsic biodegradation. This study corroborates that CSI analysis can be used as an additional line of evidence to evaluate and verify MNA. Microbial analysis provides relevant information about the capabilities of native microbial communities to carry out reductive dehalogenation and thus, to naturally attenuate chlorinated compounds at a contaminated site. The combination of microcosm studies, CSI analysis, and bacterial DNA identification is becoming a convincing line of evidence for the assessment of MNA application to chloroethenes contaminated sites.
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:
Author :Symposium on Natural Attenuation of Chlorinated Organics in Ground Water Publisher : ISBN 13 : Total Pages : pages Book Rating :4.:/5 (246 download)
Book Synopsis Proceedings of the Symposium on Natural Attenuation of Chlorinated Organics in Ground Water by : Symposium on Natural Attenuation of Chlorinated Organics in Ground Water
Download or read book Proceedings of the Symposium on Natural Attenuation of Chlorinated Organics in Ground Water written by Symposium on Natural Attenuation of Chlorinated Organics in Ground Water and published by . This book was released on 1997 with total page 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:
Author :Commission on Geosciences, Environment, and Resources Publisher :National Academies Press ISBN 13 :0309069327 Total Pages :289 pages Book Rating :4.3/5 (9 download)
Book Synopsis Natural Attenuation for Groundwater Remediation by : Commission on Geosciences, Environment, and Resources
Download or read book Natural Attenuation for Groundwater Remediation written by Commission on Geosciences, Environment, and Resources and published by National Academies Press. This book was released on 2000-08-31 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, officials responsible for clean-up of contaminated groundwater have increasingly turned to natural attenuation-essentially allowing naturally occurring processes to reduce the toxic potential of contaminants-versus engineered solutions. This saves both money and headaches. To the people in surrounding communities, though, it can appear that clean-up officials are simply walking away from contaminated sites. When is natural attenuation the appropriate approach to a clean-up? This book presents the consensus of a diverse committee, informed by the views of researchers, regulators, and community activists. The committee reviews the likely effectiveness of natural attenuation with different classes of contaminants-and describes how to evaluate the "footprints" of natural attenuation at a site to determine whether natural processes will provide adequate clean-up. Included are recommendations for regulatory change. The committee emphasizes the importance of the public's belief and attitudes toward remediation and provides guidance on involving community stakeholders throughout the clean-up process. The book explores how contamination occurs, explaining concepts and terms, and includes case studies from the Hanford nuclear site, military bases, as well as other sites. It provides historical background and important data on clean-up processes and goes on to offer critical reviews of 14 published protocols for evaluating natural attenuation.
Book Synopsis Natural Attenuation of Chlorinated Solvents, Petroleum Hydrocarbons, and Other Organic Compounds by : Bruce C. Alleman
Download or read book Natural Attenuation of Chlorinated Solvents, Petroleum Hydrocarbons, and Other Organic Compounds written by Bruce C. Alleman and published by . This book was released on 1999 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural attenuation was first demonstrated at sites with hydrocarbon contamination, but recent studies at sites contaminated by chlorinated compounds have shown that this approach often has merit for these more challenging contamination problems. This volume covers natural attenuation in media ranging from deep aquifers to shallow soils, and for contaminants ranging from fuels to solvents to herbicides, and offers the reader a comprehensive overview of case studies that represent the state of the art in natural attenuation approaches to site remediation.
Book Synopsis Assessing the Natural Attenuation of Chlorinated Ethenes in Groundwater Using Compound-specific Stable Isotope Analysis by : Christoph Aeppli
Download or read book Assessing the Natural Attenuation of Chlorinated Ethenes in Groundwater Using Compound-specific Stable Isotope Analysis written by Christoph Aeppli and published by . This book was released on 2008 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
