Download or read book Upscaling Mass Transfer for NAPL Dissolution Fingering written by Mir Ahmad Seyedabbasi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory experiments and numerical simulations in homogeneous porous media were used to investigate the influence of porous medium wettability on the formation and growth of preferential dissolution pathways, dissolution fingers, during nonaqueous-phase liquid (NAPL) dissolution. As the porous medium became increasingly NAPL-wet, dissolution fingers grew wider and slower. This result was observed in physical experiments with 0 and 100% NAPL-wet conditions and confirmed with numerical simulations at these and intermediate wettabilities. A previously derived expression for an upscaled mass transfer rate coefficient that accounts for the growth of dissolution fingers was used to quantify the effect of fingering on overall NAPL removal rates. For the test cases evaluated, NAPL dissolution fingering controlled the overall rate of NAPL dissolution after the dissolution front moved 9 cm in 0% NAPL-wet conditions and 34 cm in 100% NAPL-wet conditions. Thus, even in completely NAPL-wet media dissolution fingering may control the overall rate of NAPL dissolution after relatively short travel distances. The influence of aqueous-phase boundary conditions on dissolution fingering was also investigated. For the range of conditions studied here, constant head and constant flux boundary conditions resulted in similar finger growth and morphology of the interface between clean and NAPL-contaminated regions: the interface roughness and the growth of this roughness with pore volumes flushed were independent of boundary condition type. Laboratory studies were conducted to evaluate the influence of heterogeneity on NAPL dissolution fingering. During a spill event heterogeneous porous media favor the formation of nonuniform NAPL saturation fields, including NAPL residual and NAPL pools, that may affect the fingering mechanism. A light transmission technique was used to measure trichloroethylene saturation fields at a 0.05-cm resolution that resulted from spills in two heterogeneous packings of a laboratory test cell. The correlation length of the permeability field transverse to the mean water flow direction was selected to be similar to (1.0 cm) or significantly greater than (6.0 cm) the expected wavelength of dissolution fingers. As the entrapped NAPL dissolved into water, preferential NAPL dissolution patterns occurred in both experiments, with patterns strongly affected by the heterogeneities. Experimental results were used to validate the utility of a numerical simulator for capturing the growth of centimeter-scale preferential NAPL dissolution patterns. Using data from these experiments, four different methods for upscaling the mass transfer rate coefficient for NAPL dissolution were examined [Basu et al., 2008; Christ et al., 2006; Imhoff et al., 2003a; Saenton and Illangasekare, 2007]. These models were developed to account for the influence of dissolution fingering or NAPL architecture on the long-term flux of contaminants from NAPL source zones. In the packing where the correlation scale of permeability perpendicular to the mean water flow direction was 6.0 cm, greater than the scale of the dissolution fingers, all upscaling approaches predicted effluent concentrations reasonably well. When the correlation scale of the heterogeneities was smaller (1.0 cm), the models performed much more poorly. These results and their implications on the applicability of the upscaling models will be discussed. Among the four different upscaling approaches tested in Chapter 4 the stream-tube approach developed by Basu et al. [2008] seemed very promising in predicting the upscale mass transfer and effluent concentrations in the two physical experiments we conducted with different degrees of heterogeneities in permeability and NAPL saturation distribution. A simple stream-tube approach was developed to predict the dissolution front dynamics and effluent concentration profiles. This simple model worked poorly when used for the large correlation length system where the permeability heterogeneity was close to homogeneous, where the dissolution rate is controlled by dissolution fingering. However, when the correlation scale of heterogeneity decreased for the small correlation length system, the dissolution rate was controlled solely by the heterogeneities in permeability and NAPL saturation fields and not by the dissolution fingering mechanism. In this case the stream-tube model was able to predict the effluent concentration profile and capture the tailing in that very accurately. This model needs to be combined with the dissolution fingering model and be tested for wider range of heterogeneous systems. This is outlined as a recommendation for the future work.

Download or read book Mass Transfer Correlations for NAPL Pool Dissolution and Investigation of Cosolvent water Displacement in Porous Media written by Tae-Joon Kim and published by . This book was released on 1998 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Non aqueous Phase Liquids NAPLs in Subsurface Environment written by Lakshmi N. Reddi and published by . This book was released on 1996 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection contains 68 papers on contamination by nonaqueous phase liquids (NAPLs) presented at a specialty conference at the ASCE National Convention, held in Washington, D.C., November 10-14, 1996.

Download or read book U S National Report to International Union of Geodesy and Geophysics written by and published by . This book was released on 1995 with total page 1476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization Modeling Monitoring and Remediation of Fractured Rock written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2021-01-29 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractured rock is the host or foundation for innumerable engineered structures related to energy, water, waste, and transportation. Characterizing, modeling, and monitoring fractured rock sites is critical to the functioning of those infrastructure, as well as to optimizing resource recovery and contaminant management. Characterization, Modeling, Monitoring, and Remediation of Fractured Rock examines the state of practice and state of art in the characterization of fractured rock and the chemical and biological processes related to subsurface contaminant fate and transport. This report examines new developments, knowledge, and approaches to engineering at fractured rock sites since the publication of the 1996 National Research Council report Rock Fractures and Fluid Flow: Contemporary Understanding and Fluid Flow. Fundamental understanding of the physical nature of fractured rock has changed little since 1996, but many new characterization tools have been developed, and there is now greater appreciation for the importance of chemical and biological processes that can occur in the fractured rock environment. The findings of Characterization, Modeling, Monitoring, and Remediation of Fractured Rock can be applied to all types of engineered infrastructure, but especially to engineered repositories for buried or stored waste and to fractured rock sites that have been contaminated as a result of past disposal or other practices. The recommendations of this report are intended to help the practitioner, researcher, and decision maker take a more interdisciplinary approach to engineering in the fractured rock environment. This report describes how existing tools-some only recently developed-can be used to increase the accuracy and reliability of engineering design and management given the interacting forces of nature. With an interdisciplinary approach, it is possible to conceptualize and model the fractured rock environment with acceptable levels of uncertainty and reliability, and to design systems that maximize remediation and long-term performance. Better scientific understanding could inform regulations, policies, and implementation guidelines related to infrastructure development and operations. The recommendations for research and applications to enhance practice of this book make it a valuable resource for students and practitioners in this field.

Download or read book Gas Transport in Porous Media written by Clifford K. Ho and published by Springer Science & Business Media. This book was released on 2006-10-07 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: CLIFFORD K. HOAND STEPHEN W. WEBB Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185, USA Gas and vapor transport in porous media occur in a number of important applications includingdryingofindustrialandfoodproducts,oilandgasexploration,environm- tal remediation of contaminated sites, and carbon sequestration. Understanding the fundamental mechanisms and processes of gas and vapor transport in porous media allows models to be used to evaluate and optimize the performance and design of these systems. In this book, gas and vapor are distinguished by their available states at stan- ? dard temperature and pressure (20 C, 101 kPa). If the gas-phase constituent can also exist as a liquid phase at standard temperature and pressure (e. g. , water, ethanol, toluene, trichlorothylene), it is considered a vapor. If the gas-phase constituent is non-condensable at standard temperature and pressure (e. g. , oxygen, carbon di- ide, helium, hydrogen, propane), it is considered a gas. The distinction is important because different processes affect the transport and behavior of gases and vapors in porous media. For example, mechanisms specific to vapors include vapor-pressure lowering and enhanced vapor diffusion, which are caused by the presence of a g- phase constituent interacting with its liquid phase in an unsaturated porous media. In addition, the “heat-pipe” exploits isothermal latent heat exchange during evaporation and condensation to effectively transfer heat in designed and natural systems.

Download or read book Methods and Techniques for Cleaning up Contaminated Sites written by Michael D. Annable and published by Springer Science & Business Media. This book was released on 2008-01-29 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication comprises the presentations made at the NATO Advanced Research Workshop held in Sinaia, Romania 9 – 11 October, 2006. The contributions represent a unique cross section of issues and challenges related to contaminated site management. These range from low cost solutions to petroleum contaminated sites to advances in biological treatment methods. The publication is meant to foster links between groups facing challenges cleaning up contaminated sites.

Download or read book Contaminants in the Subsurface written by National Research Council and published by National Academies Press. This book was released on 2005-04-23 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: At hundreds of thousands of commercial, industrial, and military sites across the country, subsurface materials including groundwater are contaminated with chemical waste. The last decade has seen growing interest in using aggressive source remediation technologies to remove contaminants from the subsurface, but there is limited understanding of (1) the effectiveness of these technologies and (2) the overall effect of mass removal on groundwater quality. This report reviews the suite of technologies available for source remediation and their ability to reach a variety of cleanup goals, from meeting regulatory standards for groundwater to reducing costs. The report proposes elements of a protocol for accomplishing source remediation that should enable project managers to decide whether and how to pursue source remediation at their sites.

Download or read book Historical Painting Techniques Materials and Studio Practice written by Arie Wallert and published by Getty Publications. This book was released on 1995-08-24 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridging the fields of conservation, art history, and museum curating, this volume contains the principal papers from an international symposium titled "Historical Painting Techniques, Materials, and Studio Practice" at the University of Leiden in Amsterdam, Netherlands, from June 26 to 29, 1995. The symposium—designed for art historians, conservators, conservation scientists, and museum curators worldwide—was organized by the Department of Art History at the University of Leiden and the Art History Department of the Central Research Laboratory for Objects of Art and Science in Amsterdam. Twenty-five contributors representing museums and conservation institutions throughout the world provide recent research on historical painting techniques, including wall painting and polychrome sculpture. Topics cover the latest art historical research and scientific analyses of original techniques and materials, as well as historical sources, such as medieval treatises and descriptions of painting techniques in historical literature. Chapters include the painting methods of Rembrandt and Vermeer, Dutch 17th-century landscape painting, wall paintings in English churches, Chinese paintings on paper and canvas, and Tibetan thangkas. Color plates and black-and-white photographs illustrate works from the Middle Ages to the 20th century.

Download or read book Subsurface Hydrology written by David W. Hyndman and published by John Wiley & Sons. This book was released on 2013-04-30 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 171. Groundwater is a critical resource and the PrinciPal source of drinking water for over 1.5 billion people. In 2001, the National Research Council cited as a "grand challenge" our need to understand the processes that control water movement in the subsurface. This volume faces that challenge in terms of data integration between complex, multi-scale hydrologie processes, and their links to other physical, chemical, and biological processes at multiple scales. Subsurface Hydrology: Data Integration for Properties and Processes presents the current state of the science in four aspects: Approaches to hydrologie data integration Data integration for characterization of hydrologie properties Data integration for understanding hydrologie processes Meta-analysis of current interpretations Scientists and researchers in the field, the laboratory, and the classroom will find this work an important resource in advancing our understanding of subsurface water movement.

Download or read book Contaminant Geochemistry written by Brian Berkowitz and published by Springer Science & Business. This book was released on 2014-04-22 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this updated and expanded second edition, new literature has been added on contaminant fate in the soil-subsurface environment. In particular, more data on the behavior of inorganic contaminants and on engineered nanomaterials were included, the latter comprising a group of “emerging contaminants” that may reach the soil and subsurface zones. New chapters are devoted to a new perspective of contaminant geochemistry, namely irreversible changes in pristine land and subsurface systems following chemical contamination. Two chapters were added on this topic, focusing attention on the impact of chemical contaminants on the matrix and properties of both liquid and solid phases of soil and subsurface domains. Contaminant impacts on irreversible changes occurring in groundwater are discussed and their irreversible changes on the porous medium solid phase are surveyed. In contrast to the geological time scale controlling natural changes of porous media liquid and solid phases, the time scale associated with chemical pollutant induced changes is far shorter and extends over a “human lifetime scale”.

Download or read book Radical Media written by John D. H. Downing and published by SAGE. This book was released on 2000-08-18 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an entirely new edition of the author′s 1984 study (originally published by South End Press) of radical media and movements. The first and second sections are original to this new edition. The first section explores social and cultural theory in order to argue that radical media should be a central part of our understanding of media in history. The second section weaves an historical and international tapestry of radical media to illustrate their centrality and diversity, from dance and graffiti to video and the internet and from satirical prints and street theatre to culture-jamming, subversive song, performance art and underground radio. The section also includes consideration of ultra-rightist media as a key contrast case. The book′s third section provides detailed case-studies of the anti-fascist media explosion of 1974-75 in Portugal, Italy′s long-running radical media, radio and access video in the USA, and illegal media in the dissolution of the former Soviet bloc dictatorships.

Download or read book Geologic Carbon Sequestration written by V. Vishal and published by Springer. This book was released on 2016-05-11 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This exclusive compilation written by eminent experts from more than ten countries, outlines the processes and methods for geologic sequestration in different sinks. It discusses and highlights the details of individual storage types, including recent advances in the science and technology of carbon storage. The topic is of immense interest to geoscientists, reservoir engineers, environmentalists and researchers from the scientific and industrial communities working on the methodologies for carbon dioxide storage. Increasing concentrations of anthropogenic carbon dioxide in the atmosphere are often held responsible for the rising temperature of the globe. Geologic sequestration prevents atmospheric release of the waste greenhouse gases by storing them underground for geologically significant periods of time. The book addresses the need for an understanding of carbon reservoir characteristics and behavior. Other book volumes on carbon capture, utilization and storage (CCUS) attempt to cover the entire process of CCUS, but the topic of geologic sequestration is not discussed in detail. This book focuses on the recent trends and up-to-date information on different storage rock types, ranging from deep saline aquifers to coal to basaltic formations.

Download or read book Manufacturing Consent written by Edward S. Herman and published by Pantheon. This book was released on 2011-07-06 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A "compelling indictment of the news media's role in covering up errors and deceptions" (The New York Times Book Review) due to the underlying economics of publishing—from famed scholars Edward S. Herman and Noam Chomsky. With a new introduction. In this pathbreaking work, Edward S. Herman and Noam Chomsky show that, contrary to the usual image of the news media as cantankerous, obstinate, and ubiquitous in their search for truth and defense of justice, in their actual practice they defend the economic, social, and political agendas of the privileged groups that dominate domestic society, the state, and the global order. Based on a series of case studies—including the media’s dichotomous treatment of “worthy” versus “unworthy” victims, “legitimizing” and “meaningless” Third World elections, and devastating critiques of media coverage of the U.S. wars against Indochina—Herman and Chomsky draw on decades of criticism and research to propose a Propaganda Model to explain the media’s behavior and performance. Their new introduction updates the Propaganda Model and the earlier case studies, and it discusses several other applications. These include the manner in which the media covered the passage of the North American Free Trade Agreement and subsequent Mexican financial meltdown of 1994-1995, the media’s handling of the protests against the World Trade Organization, World Bank, and International Monetary Fund in 1999 and 2000, and the media’s treatment of the chemical industry and its regulation. What emerges from this work is a powerful assessment of how propagandistic the U.S. mass media are, how they systematically fail to live up to their self-image as providers of the kind of information that people need to make sense of the world, and how we can understand their function in a radically new way.

Download or read book Soil and Groundwater Contamination written by Alex S. Mayer and published by American Geophysical Union. This book was released on 2005-01-14 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM ... "contains spreadsheets used in many of the example calculations, color versions of some of the illustrations, and movies illustrating the NAPL migration."--Page vi.

Download or read book Environmental Soil Remediation and Rehabilitation written by Eric D. van Hullebusch and published by Springer Nature. This book was released on 2020-04-22 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of innovative remediation techniques and strategies for soils contaminated by heavy metals or organic compounds (e.g. petroleum hydrocarbons, NAPLs and chlorinated organic compounds). It discusses various novel chemical remediation approaches (in-situ and ex-situ) used alone and in combination with physical and/or thermal treatment. Further, it addresses the recovery of NAPLs, reuse of leaching solutions, and in-situ chemical reduction and oxidation, and explores the chemical enhancement of physical NAPLs recovery from both practical and theoretical perspectives. Also presenting the state-of-the-art in waste-assisted bioremediation to improve soil quality and the remediation of petroleum hydrocarbons, the book is a valuable resource for students, researchers and R&D professionals in industry engaged in the treatment of contaminated soils.

Download or read book Ruling Culture written by Fiona Greenland and published by University of Chicago Press. This book was released on 2021-03-15 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A major, on-the-ground look at antiquities looting in Italy. More looting of ancient art takes place in Italy than in any other country. Ironically, Italy trades on the fact to demonstrate its cultural superiority over other countries. And, more than any other country, Italy takes pains to prevent looting by instituting laws, cultural policies, export taxes, and a famously effective art-crime squad that has been the inspiration of novels, movies, and tv shows. In fact, Italy is widely regarded as having invented the discipline of art policing. In 2006 the then-president of Italy declared his country to be "the world's greatest cultural power." Why do Italians believe this? Why is the patria, or "homeland," so frequently invoked in modern disputes about ancient art, particularly when it comes to matters of repatriation, export, and museum loans? Fiona Greenland's Ruling Culture addresses these questions by tracing the emergence of antiquities as a key source of power in Italy from 1815 to the present. Along the way, it investigates the activities and interactions of three main sets of actors: state officials (including Art Squad agents), archaeologists, and illicit excavators and collectors"--