Download or read book Evaluation of Natural Attenuation Processes for Trichloroethylene and Technetium 99 in the Northeast and Northwest Plumes at the Paducah Gaseous Diffusion Plant Paducah Kentucky written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: NA processes such as biodegradation, sorption, dilution dispersion, advection, and possibly sorption and diffusion are occurring in the Northeast and Northwest plumes. However, the overall biological attenuation rate for TCE within the plumes is not sufficiently rapid to utilize as remedial option. The mobility and toxicity of[sup 99]Tc is not being reduced by attenuating processes within the Northwest Plume. The current EPA position is that NA is not a viable remedial approach unless destructive processes are present or processes are active which reduce the toxicity and mobility of a contaminant. Therefore, active remediation of the dissolved phase plumes will be necessary to reduce contaminant concentrations before an NA approach could be justified at PGDP for either plume. Possible treatment methods for the reduction of dissolved phase concentrations within the plumes are pump-and-treat bioaugmentation, biostimulation, or multiple reactive barriers. Another possibility is the use of a regulatory instrument such as an Alternate Concentration Limit (ACL) petition. Biodegradation of TCE is occurring in both plumes and several hypothesis are possible to explain the apparent conflicts with some of the geochemical data. The first hypothesis is active intrinsic bioremediation is negligible or so slow to be nonmeasurable. In this scenario, the D.O., chloride, TCE, and isotopic results are indicative of past microbiological reactions. It is surmised in this scenario, that when the initial TCE release occurred, sufficient energy sources were available for microorganisms to drive aerobic reduction of TCE, but these energy sources were rapidly depleted. The initial degraded TCE has since migrated to downgradient locations. In the second scenario, TCE anaerobic degradation occurs in organic-rich micro-environments within a generally aerobic aquifer. TCE maybe strongly absorbed to organic-rich materials in the aquifer matrix and degraded by local Immunities of microbes, perhaps even under anaerobic conditions. Chloride, generated by degradation in such microenvironment is released rapidly into the water, as is CO[sub 2], from respiration of the microorganisms. TCE and its organic degradation products are retained on the aquifer matrix by sorption, and released more slowly into the groundwater. In this process, chloride produced from the microbial reaction may become separated in the plume from the residual TCE. This may explain why the chloride isotope ratio and dissolved TCE do not correlate with the DIC isotope ratio. The relationship between the[delta][sup 37]Cl values of TCE and dissolved inorganic chloride is consistent with what would be expected from the degradation of TCE, but is complicated by the elevated levels of background chloride, presumably due to agriculture practice, and complex behavior of TCE in the aquifer.
Download or read book ASSESSING AEROBIC NATURAL ATTENUATION OF TRICHLOROETHENE AT FOUR DOE SITES written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A 3-year Department of Energy Environmental Science Management Program (EMSP) project is currently investigating natural attenuation of trichloroethene (TCE) in aerobic groundwater. Determining whether TCE degradation occurs at meaningful rates under aerobic conditions via biological cometabolism has important implications for the assessment of natural attenuation. This presentation summarizes the results of a screening process to identify TCE plumes at DOE facilities that are suitable for assessing the rate of TCE attenuation under aerobic conditions. In order to estimate aerobic degradation rates, plumes had to meet the following criteria: TCE must be present in aerobic groundwater, a conservative co-contaminant must be present and have approximately the same source as TCE, and the groundwater velocity must be known. A total of 127 TCE plumes were considered across 24 DOE sites. The four sites retained for the assessment were: 1) Brookhaven National Laboratory, OU III; 2) Paducah Gaseous Diffusion Plant, Northwest Plume; 3) Rocky Flats Environmental Technology Site, Industrialized Area – Southwest Plume and 903 Pad South Plume; and 4) Savannah River Site, A/M Area Plume. The analysis indicates that TCE is being preferentially attenuated at environmentally significant rates under aerobic conditions with degradation half-lives ranging from 0.85 to 12 years in 8 of the 9 plumes evaluated.
Download or read book Water Encyclopedia Oceanography Meteorology Physics and Chemistry Water Law and Water History Art and Culture written by Jay H. Lehr and published by Wiley-Interscience. This book was released on 2005-06 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 1 outlines water supply infrastructure. The requirements for supplying water to a home, a city or a factory can be very different. Experts in these fields explain the nuances of the details involved in maintaining adequate quantity and quality for these different consumers. Waste water management can be of even greater concern, yet its management can follow similar paths when compared to sophisticated water supply treatment. Both the physics and chemistry of these fields are fully covered. Volume 2 deals with the big picture of regional water supplies, how they become contaminated, how they can be protected and how they can best serve the surrounding populations and industries. Significant focus is placed upon the natural chemistry of available water supplies and its biological impacts. Case studies from regions around the world offer an excellent picture of the world's water resources.
Download or read book Introduction to Phytoremediation of Contaminated Groundwater written by James E. Landmeyer and published by Springer Science & Business Media. This book was released on 2011-09-18 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the reader with the comprehensive view necessary to understand and critically evaluate the design, implementation, and monitoring of phytoremediation at sites characterized by contaminated groundwater. Part I presents the historical foundation of the interaction between plants and groundwater, introduces fundamental groundwater concepts for plant physiologists, and introduces basic plant physiology for hydrogeologists. Part II presents information on how to assess, design, implement, and monitor phytoremediation projects for hydrologic control. Part III presents how plants take up and detoxify a wide range of organic xenobiotics in contaminated groundwater systems, and provides various approaches on how this can be assessed and monitored. Throughout, concepts are emphasized with numerous case studies, illustrations and pertinent literature citations.
Download or read book The Toxicology and Biochemistry of Insecticides written by Simon J. Yu and published by CRC Press. This book was released on 2011-03-05 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book in two decades to address this multi-faceted field, The Toxicology and Biochemistry of Insecticides provides the most up-to-date information on insecticide classification, formulation, mode of action, resistance, metabolism, environmental fate, and regulatory legislation. The book draws on the author's groundbreaking research
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.
Download or read book Geology of Water in Ohio written by Wilber Stout and published by . This book was released on 1943 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactor Fuel Processing written by and published by . This book was released on 1964 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Brownfields Program written by and published by . This book was released on 2002 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid Thermal Diffusion written by Philip Hauge Abelson and published by . This book was released on 1958 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yvain written by Chretien de Troyes and published by Yale University Press. This book was released on 1987-09-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A twelfth-century poem by the creator of the Arthurian romance describes the courageous exploits and triumphs of a brave lord who tries to win back his deserted wife's love
Download or read book Civilian Power Reactor Program written by U.S. Atomic Energy Commission and published by . This book was released on 1960 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Plutonium Story written by Glenn Theodore Seaborg and published by . This book was released on 1994 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book chronicles on a day-to-day basis the astounding story of the discovery of plutonium and the feverish activities to unlock its secrets and enhance its productivity to the levels necessary for the building of an atomic bomb in World War II by its discoverer, Professor Glenn T. Seaborg. Seaborg, who shared the 1951 nobel Prize in Chemistry with his colleague Edwin T. McMillan, was a meticulous diarist whose detailed records of thousands of pages have been edited and supplied with accompanying notes by a trio consisting of a professional scientist with a strong interest in history and two professional historians of science. The work provides not only the step by step description of the scientific activities and the thought processes of Seaborg and his team throughout the war years, but also gives keen insight into the operation of the Manhattan District and of the scientists who played an important role in its functions. Virtually all of the players are identified in the annotations, which also serve to explain the significance of key events and findings as well as obscure or arcane scientific procedures. The professional chemist or nuclear scientist will find this an exciting and compelling saga of a great scientific discovery, carried out in a bygone era of unfettered and productive science that is not likely to occur again. The copious annotations and identifications not only add to the story, but make this a vital and necessary reading and reference source not only for the historian of science, but for those interested in the behind the scenes history of World War II and the Manhattan District.
Download or read book The Road to Trinity written by Kenneth David Nichols and published by William Morrow. This book was released on 1987 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This personal account of how America's nuclear policies were developed tells the real story behing the successes and failures of the civilian nuclear program. 8 pages of black-and-white photographs.
Download or read book Environmental Consequences of War and Aftermath written by Tarek A. Kassim and published by Springer Science & Business Media. This book was released on 2009-04-07 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: and used in munitions. Rather the requirements for the agent’s military effects took precedence. In addition, the interaction among the political, technical, and legal challenges connected with the known or possible risks posed by CW agents is complex and sometimes not well understood. This is usually because technical considerations, when acted on, are almost invariably informed by political ones, such as various legal requirements. The book contains nine chapters covering different aspects of the research on environmental consequences of war and its aftermath and covers in one additional chapter more general issues such as prevention of war and its environmental c- sequences, the legal, political, and technical background to selected environmental and human health effects of CW agents, and the atmospheric transport and depo- tion of persistent organic pollutants under warfare conditions to more specific ones related to two main tragic examples: the war in the Balkans and the Gulf War. Aspects of the war in the Balkans cover contamination by heavy metals in Serbian national parks, the impact of NATO strikes on the Danube river basin, and the problems associated with transuranium elements. The Gulf War in Kuwait covers other problems related to the impact of oil contamination, the impact on grou- water resources, and the soil damage of ground fortifications among other envir- mental and health problems.
Download or read book Charles Pettigrew First Bishop elect of the North Carolina Episcopal Church written by Bennett H Wall and published by Hassell Street Press. This book was released on 2021-09-10 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
