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Monitored Natural Attenuation Of Chlorinated Solvents Moving Beyond Reuctive Dechlorination
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Book Synopsis Monitored Natural Attenuation of Chlorinated Solvents - Moving Beyond Reuctive Dechlorination by :
Download or read book Monitored Natural Attenuation of Chlorinated Solvents - Moving Beyond Reuctive Dechlorination written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Monitored natural attenuation (MNA), while a remedy of choice for many sites, can be challenging when the contaminants are chlorinated solvents. Even with many high quality technical guidance references available there continue to be challenges implementing MNA at some chlorinated solvent sites. The U.S. Department of Energy, as one organization facing such challenges, is leading a project that will incorporate developing concepts and tools into the existing toolbox for selecting and implementing MNA as a remediation option at sites with chlorinated solvents contamination. The structure and goals of this project were introduced in an article in the Winter 2004 issue of Remediation (Sink et al.). This article is a summary of the three technical areas being developed through the project: mass balance, enhanced attenuation, and characterization and monitoring supporting the first two areas. These topics will be documented in separate reports available from the US Department of Energy Office of Scientific and Technical Information at www.osti.gov.
Book Synopsis The Old Man in the Corner by : Emmuska Orczy
Download or read book The Old Man in the Corner written by Emmuska Orczy and published by . This book was released on 2012-11-21 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Old Man in the Corner was one of the earliest armchair detectives, popping up with so many others in the wake of the huge popularity of the Sherlock Holmes stories. The Old Man relies mostly upon sensationalistic "penny dreadful" newspaper accounts, with the occasional courtroom visit for extra laughs. He narrates all this information (while tying complicated knots in a piece of string) to a Lady Journalist who frequents the same tea-shop.
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 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 Monitored Natural Attenuation of Chlorinated Solvents by : Mary Joann Thurman
Download or read book Monitored Natural Attenuation of Chlorinated Solvents written by Mary Joann Thurman and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Capstone objectives are: 1) Analyze the potential for monitored natural attenuation to achieve the site-specific risk-based clean up goals for 1,1,1-Trichloroethane (TCA) and 1,1-Dichloroethene(1,1-DCE). One expected degradation pathway for TCA is: TCA U+2026.. 1,1-DCEU+2026U+2026..Vinyl ChlorideU+2026..CO2. 2) Compare the cost difference between Monitored Natural Attenuation and Traditional Pump-and-treat remediation strategies.
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 Monitored Natural Attenuation of Chlorinated Solvents by : Daniel F. Pope
Download or read book Monitored Natural Attenuation of Chlorinated Solvents written by Daniel F. Pope and published by . This book was released on 1999 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis DETECTING AND QUANTIFYING REDUCTIVE DECHLORINATION DURING MONITORED NATURAL ATTENUATION AT THE SAVANNAH RIVER CBRP SITE. by :
Download or read book DETECTING AND QUANTIFYING REDUCTIVE DECHLORINATION DURING MONITORED NATURAL ATTENUATION AT THE SAVANNAH RIVER CBRP SITE. written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Various attenuation mechanisms control the destruction, stabilization, and/or removal of contaminants from contaminated subsurface systems. Measuring the rates of the controlling attenuation mechanisms is a key to employing mass balance as a means to evaluate and monitor the expansion, stability and subsequent shrinkage of a contaminant plume. A team of researchers investigated the use of push-pull tests for measuring reductive dechlorination rates in situ at sites with low chlorinated solvent concentrations (
Book Synopsis Natural and Enhanced Attenuation of Chlorinated Solvents Using RT3D. by :
Download or read book Natural and Enhanced Attenuation of Chlorinated Solvents Using RT3D. written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: RT3D (Reactive Transport in 3-Dimensions) is a reactive transport code that can be applied to model solute fate and transport for many different purposes. This document specifically addresses application of RT3D for modeling related to evaluation and implementation of Monitored Natural Attenuation (MNA). Selection of MNA as a remedy requires an evaluation process to demonstrate that MNA will meet the remediation goals. The U.S. EPA, through the Office of Solid Waste and Emergency Response (OSWER) Directive 9200.4?17P, provides the regulatory context for the evaluation and implementation of MNA. In a complementary fashion, the context for using fate and transport modeling as part of MNA evaluation is described in the EPA?s technical protocol for chlorinated solvent MNA, the Scenarios Evaluation Tool for Chlorinated Solvent MNA, and in this document. The intent of this document is to describe (1) the context for applying RT3D for chlorinated solvent MNA and (2) the attenuation processes represented in RT3D, (3) dechlorination reactions that may occur, and (4) the general approach for using RT3D reaction modules (including a summary of the RT3D reaction modules that are available) to model fate and transport of chlorinated solvents as part of MNA or for combinations of MNA and selected types of active remediation.
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 Natural Attenuation of Fuels and Chlorinated Solvents in the Subsurface by : Todd H. Wiedemeier
Download or read book Natural Attenuation of Fuels and Chlorinated Solvents in the Subsurface written by Todd H. Wiedemeier and published by John Wiley & Sons. This book was released on 1999-03-08 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive guide to one of today's most innovative approaches to environmental contamination Natural attenuation is gaining increasing attention as a nonintrusive, cost-effective alternative to standard remediation techniques for environmental contamination. This landmark work presents the first in-depth examination of the theory, mechanisms, and application of natural attenuation. Written by four internationally recognized leaders in this approach, the book describes both biotic and abiotic natural attenuation processes, focusing on two of the environmental contaminants most frequently encountered in groundwater--fuels and chlorinated solvents. The authors draw on a wealth of combined experience to detail successful techniques for simulating natural attenuation processes and predicting their effectiveness in the field. They also show how natural attenuation works in the real world, using numerous examples and case studies from a wide range of leading-edge projects nationwide involving fuel hydrocarbons and chlorinated solvents. Finally, they discuss the evaluation and assessment of natural attenuation and explore the design of long-term monitoring programs. An indispensable reference for anyone working in environmental remediation, Natural Attenuation of Fuels and Chlorinated Solvents in the Subsurface is essential reading for scientists and engineers in a range of industries, as well as state and federal environmental regulators, and professors and graduate students in environmental or chemical engineering.
Book Synopsis ADVANCING THE SCIENCE OF NATURAL AND ENHANCED ATTENUATION FOR CHLORINATED SOLVENTS. by : B. Looney
Download or read book ADVANCING THE SCIENCE OF NATURAL AND ENHANCED ATTENUATION FOR CHLORINATED SOLVENTS. written by B. Looney and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of a three-year program that addressed key scientific and technical aspects related to natural and enhanced attenuation of chlorinated organics. The results from this coordinated three-year program support a variety of technical and regulatory advancements. Scientists, regulators, engineers, end-users and stakeholders participated in the program, which was supported by the U.S. Department of Energy (DOE) and the Interstate Technology and Regulatory Council (ITRC). The overarching objective of the effort was to examine environmental remedies that are based on natural processes--remedies such as Monitored Natural Attenuation (MNA) or Enhanced Attenuation (EA). A key result of the recent effort was the general affirmation of the approaches and guidance in the original U.S. Environmental Protection Agency (EPA) chlorinated solvent MNA protocols and directives from 1998 and 1999, respectively. The research program did identify several specific opportunities for advances based on: (1) mass balance as the central framework for attenuation based remedies, (2) scientific advancements and achievements during the past ten years, (3) regulatory and policy development and real-world experience using MNA, and (4) exploration of various ideas for integrating attenuation remedies into a systematic set of ''combined remedies'' for contaminated sites. These opportunities are summarized herein and are addressed in more detail in referenced project documents and journal articles, as well as in the technical and regulatory documents being developed within the ITRC. Natural attenuation processes occur in all soil and groundwater systems and act, to varying degrees, on all contaminants. Thus, a decision to rely on natural attenuation processes as part of a site-remediation strategy does not depend on the occurrence of natural attenuation, but on its effectiveness in meeting site-specific remediation goals. Meeting these goals typically requires low risk, plume stability, and documentation of accepted and sustainable attenuation processes. Plume stability and sustainability depend on the balance between contaminant loading into the plume and contaminant attenuation within the plume. This ''mass balance'' is a simple and powerful idea that developed into the central framework for all aspects of the DOE MNA/EA program. The centrality of mass balance has been advocated by Chapelle and others (e.g., 1995) for several years, and the concepts proved to be critical to conceptualizing natural attenuation remedies, designing enhancements, developing characterization and monitoring strategies, and developing regulatory decision frameworks that encourage broader use of MNA/EA with clarified technical responsibility.
Book Synopsis Characterization And Monitoring Of Natural Attenuation Of Chlorinated Solvents In Ground Water by :
Download or read book Characterization And Monitoring Of Natural Attenuation Of Chlorinated Solvents In Ground Water written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 CHARACTERIZATION AND MONITORING OF NATURAL ATTENUATION OF CHLORINATED SOLVENTS IN GROUNDWATER by : David Peterson
Download or read book CHARACTERIZATION AND MONITORING OF NATURAL ATTENUATION OF CHLORINATED SOLVENTS IN GROUNDWATER written by David Peterson and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this document is to examine the use of a phased approach to characterizing and monitoring (C & M) natural attenuation processes and enhanced attenuation processes and to identify promising tools and techniques by which to accomplish the C & M. We will investigate developing techniques, such as molecular-based assessment tools, and existing tools that traditionally have not been used for monitoring the performance of environmental remediation technologies. Case studies will be used to provide examples of how non-traditional methods are being employed as characterization and monitoring tools to support MNA and EA. The document is not focused on a specific group of readers but rather is broadly directed with the intent that readers may gain information useful to their purposes. Thus, regulators may see some future characterization and monitoring techniques; end users may find novel ways to make MNA or EA more effective or efficient at their site; researchers may identify new areas for development or new and better combinations of existing methods. One consequence of this broad approach is that some readers may find certain sections either too rudimentary or too advanced for their needs. Hopefully, all will be able to use at least some of the document.
Book Synopsis Compatibility of Alternative Chlorinated Solvent Source Treatment Strategies With Monitored Natural Attenuation by :
Download or read book Compatibility of Alternative Chlorinated Solvent Source Treatment Strategies With Monitored Natural Attenuation written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most powerful and promising strategies for optimizing environmental restoration is the use of combinations of technologies rather than a single technology to reach the target cleanup goals. The U.S. Department of Energy (DOE) is actively working to clean up legacy contamination from its operations. Notably, DOE is responsible for the cleanup of many sites where the contamination includes chlorinated solvents (or chlorinated volatile organic contaminants (CVOCs)). At some sites, groundwater plumes containing CVOCs tend to become relatively large. Estimates for times to remediate sites often ranges up to 100s of years for these large plumes. As a result, the CVOC plumes are a concern to DOE, regulators and stakeholders. In response to this challenge, DOE initiated a project to ''provide the technical and policy support to facilitate implementing appropriate passive cleanup ... leading to responsible completion of active remediation activities at high risk DOE waste sites.'' A combined approach benefits from the ability to match the invasiveness and aggressiveness of the remedial action to the amount of contamination and level of risk. This matching process is particularly important for recalcitrant contaminants such as chlorinated solvents. Highly contaminated areas justify more intense remediation action(s) while minimally contaminated areas are suited to natural or even passive methods. A logical extension of this concept is the need to transition technologies through time as sites become cleaner. The extended approach, sometimes described as a ''technology train, '' responds to changing conditions with the goal of optimizing cleanup.
Book Synopsis Baseline Natural Attenuation Processes Lines of Inquiry Supporting Monitored Natural Attenuation of Chlorinated Solvents by :
Download or read book Baseline Natural Attenuation Processes Lines of Inquiry Supporting Monitored Natural Attenuation of Chlorinated Solvents written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of Energy is sponsoring an initiative to facilitate efficient, effective and responsible use of Monitored Natural Attenuation and Enhanced Passive Remediation for chlorinated solvents. This Office of Environmental Management ''Alternative Project, '' focuses on providing scientific and policy support for MNA/EPR. A broadly representative working group of scientists supports the project along with partnerships with regulatory organizations such as the Interstate Technology Regulatory Council and the Environmental Protection Agency. The initial product of the technical working group was a summary report that articulated the conceptual approach and central scientific tenants of the project, and that identified a prioritized listing of technical targets for field research. This report documented the process in which scientific ground rules were developed, lines of inquiry were identified and then critically evaluated, promising applied research topics were highlighted in the various lines of inquiry, and these were discussed and prioritized. The summary report will serve as a resource to guide management and decision making throughout the period of the subject MNA/EPR Alternative Project. To support and more fully document the information presented in the summary report, we are publishing a series of supplemental documents that present the full texts from the technical analyses within the various lines of inquiry. The following report documenting our evaluation of the state of the science of baseline natural attenuation processes is one of those supplemental documents.
