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A Numerical Multi Model Approach To Assess The Removal Of Organic Groundwater Contaminants Influenced By Air Sparging
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Book Synopsis A Numerical Multi-model Approach to Assess the Removal of Organic Groundwater Contaminants Influenced by Air Sparging by : Craig C. Arola
Download or read book A Numerical Multi-model Approach to Assess the Removal of Organic Groundwater Contaminants Influenced by Air Sparging written by Craig C. Arola and published by . This book was released on 1996 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Report to the Legislature by : Wisconsin Groundwater Coordinating Council
Download or read book Report to the Legislature written by Wisconsin Groundwater Coordinating Council and published by . This book was released on 1997-08 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-phase Flow Modeling of Soil Contamination and Soil Remediation by : R. van DIJKE
Download or read book Multi-phase Flow Modeling of Soil Contamination and Soil Remediation written by R. van DIJKE and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis multi-phase flow models are used to study the flow behavior of liquid contaminants in aquifers and of gases that are injected below the groundwater table for remediation purposes. Considered problems are redistribution of a lens of light nonaqueous phase liquid (LNAPL) on a horizontal water table with emphasis on the effect of NAPL entrapment by water and its removal through a well with appropriate multi-phase seepage conditions at the well boundary. In addition, air injection into groundwater (air sparging) in a homogeneous soil and in a layered soil are modeled. Accurate but very time-consuming numerical simulations for the various problems are performed. For further analysis appropriate reductions are made. Assuming vertical equilibrium and vertical averaging of the flow equations reduce the geometrical dimensionality of the LNAPL lens problems and of the problem of air sparging in a layered soil. The air sparging problems are analyzed at steady state, which eliminates the time dependence. Sparging in a homogeneous soil admits further reduction by neglecting capillary forces in vertical direction. For all problems the resulting equations are of nonlinear diffusion type, that can be cast into the porous medium equation. For the various problems similarity solutions to the porous medium equation exist, that show good agreement with numerical results. These analytical solutions give the main features of the spreading velocity of an LNAPL lens and the amount of NAPL that becomes trapped, of the LNAPL removal rate and the extension of the remaining NAPL in case of extraction, and of the air sparging radius of influence in a homogeneous and in a layered soil.
Book Synopsis Unsteady Multiphase Flow Modeling of IN-SITU Air Sparging System in a Variable Saturated Subsurface Environment by : Wonyong Jang
Download or read book Unsteady Multiphase Flow Modeling of IN-SITU Air Sparging System in a Variable Saturated Subsurface Environment written by Wonyong Jang and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to preserve groundwater resources from contamination by volatile organic compounds and to clean up sites contaminated with the compounds, we should understand fate and transport of contaminants in the subsurface systems and physicochemical processes involving remediation technologies. To enhance our understanding, numerical studies were performed on the following topics: (i) multiphase flow and contaminant transport in subsurface environments; (ii) biological transformations of contaminants; (iii) in-situ air sparging (IAS); and, thermal-enhanced venting (TEV). Among VOCs, trichloroethylene (TCE) is one of the most-frequently-detected chemicals in the contaminated groundwater. TCE and its daughter products (cis-1,2-dichloroethylene (cDCE) and vinyl chloride (VC)) are chosen as target contaminants. Density-driven advection of gas phase is generated by the increase in gas density due to vaporization of high-molecular weight contaminants such as TCE in the unsaturated zone. The effect of the density-driven advection on fate and transport of TCE was investigated under several environmental conditions involving infiltration and permeability. Biological transformations of contaminants can generate byproducts, which may become new toxic contaminants in subsurface systems. Sequential biotransformations of TCE, cDCE, and VC are considered herein. Under different reaction rates for two bioreaction kinetics, temporal and spatial concentration profiles of the contaminants were examined to evaluate the effect of biotransformations on multispecies transport. IAS injects clean air into the subsurface below the groundwater table to remediate contaminated groundwater. The movement of gas and the groundwater as a multiphase flow in the saturated zone and the removal of TCE by IAS application were analyzed. Each fluid flow under IAS was examined in terms of saturation levels and fluid velocity profiles in a three-dimensional domain. Several scenarios for IAS systems were simulated to evaluate remedial performance of the systems. TEV was simulated to investigate its efficiency on the removal of a nonaqueous phase liquid in the unsaturated zone under different operational conditions. For numerical studies herein, the governing equations for multiphase flow, multispecies transport, and heat energy in porous media were developed and solved using Galerkin finite element method. A three-dimensional numerical model, called TechFlowMP model, has been developed.
Book Synopsis Proceedings of China-Europe Conference on Geotechnical Engineering by : Wei Wu
Download or read book Proceedings of China-Europe Conference on Geotechnical Engineering written by Wei Wu and published by Springer. This book was released on 2018-08-02 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles the second part of contributions to the China–Europe Conference on Geotechnical Engineering held 13.-16. August 2018 in Vienna, Austria. About 400 papers from 35 countries cover virtually all areas of geotechnical engineering and make this conference a truly international event. The contributions are grouped into thirteen special sessions and provide an overview of the geoengineering research and practice in China, Europe and the world: · Constitutive model · Micro-macro relationship · Numerical simulation · Laboratory testing · Geotechnical monitoring, instrumentation and field test · Foundation engineering · Underground construction · Environmental geotechnics · New geomaterials and ground improvement · Cold regions geotechnical engineering · Geohazards – risk assessment, mitigation and prevention · Unsaturated soils and energy geotechnics · Geotechnics in transportation, structural and hydraulic Engineering
Book Synopsis In-situ Air Sparging - Engineering and Design (EM 1110-1-4005). by :
Download or read book In-situ Air Sparging - Engineering and Design (EM 1110-1-4005). written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cross-Flow, Non-Equilibrium Model of Air Sparging by : Osama Al-Gahtani
Download or read book Cross-Flow, Non-Equilibrium Model of Air Sparging written by Osama Al-Gahtani and published by LAP Lambert Academic Publishing. This book was released on 2009-08 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to the Environmental Protection Agency (EPA), air sparging is the most developed innovative in-situ technology for groundwater remediation in USA. Air sparging systems are easy to implement, and relatively simple to operate. In addition, it is a relatively low cost remediation technology that can be applied in conjunction with other remediation technologies. For these reasons, air sparging has become widely used. In this book the investigation of various "rule of thumb" design protocols for air sparging using a cross-flow two-compartment numerical model to improve the efficiency of air sparging. A numerical model was developed by the author and presented here was concurrently used with multiphase flow software. The recent developed model considers the contaminant concentrations in the two compartments: gas and dissolved phases. Mass balance has been applied for deriving a pair of linked partial differential equations. A numerical technique solution using the finite difference method has been used simultaneously in solving for the contaminant concentration in both gas and liquid phases. An analytical solution has been derived and verified with the numerical solution.
Book Synopsis Numerical Models in Groundwater Pollution by : Karel Kovarik
Download or read book Numerical Models in Groundwater Pollution written by Karel Kovarik and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical models are powerful tools used in the prediction of pollutant movement. This book discusses the Finite Element Method (FEM) and Boundary Element Method (BEM), and takes a look at the advantages of these methods in groundwater hydrology. The combination of the BEM and the random-walk particle tracking method is also presented. The book includes computer programs, source code, and examples developed on the basis of the theoretical backgrounds of these methods. These Visual C++ programs are compatible with the Windows platform.
Book Synopsis Analytical Modeling of Solute Transport in Groundwater by : Mark Goltz
Download or read book Analytical Modeling of Solute Transport in Groundwater written by Mark Goltz and published by John Wiley & Sons. This book was released on 2017-02-08 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Teaches, using simple analytical models how physical, chemical, and biological processes in the subsurface affect contaminant transport Uses simple analytical models to demonstrate the impact of subsurface processes on the fate and transport of groundwater contaminants Includes downloadable modeling tool that provides easily understood graphical output for over thirty models Modeling tool and book are integrated to facilitate reader understanding Collects analytical solutions from many sources into a single volume and, for the interested reader, shows how these solutions are derived from the governing model equations
Book Synopsis Contaminated Ground Water and Sediment by : Calvin C. Chien
Download or read book Contaminated Ground Water and Sediment written by Calvin C. Chien and published by CRC Press. This book was released on 2003-11-24 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the documented result of an expert workshop, Modeling and Management of Emerging Environmental Issues, held at Penn State University. This event assembled four panels of modeling experts from the U.S. and Canada to discuss modeling technology development and application in order to promote sound and cost-effective environmental decision-making. This thorough analysis provides an overview on the state-of-the-art in current practice and identifies emerging research and development trends within modeling technology. Each of the discussions considers not only technical issues, but regulatory and cost factors as well.
Book Synopsis Mathematical Modeling of Groundwater Pollution by : Ne-Zheng Sun
Download or read book Mathematical Modeling of Groundwater Pollution written by Ne-Zheng Sun and published by Springer Science & Business Media. This book was released on 2014-07-08 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is one of the most important resources in the world. In many areas, water supplies for industrial, domestic, and agricultural uses are de pendent on groundwater. As an "open" system, groundwater may exchange mass and energy with its neighboring systems (soil, air, and surface water) through adsorption, ion-exchange, infiltration, evaporation, inflow, outflow, and other exchange forms. Consequently, both the quantity and quality of groundwater may vary with environmental changes and human activities. Due to population growth, and industrial and agricultural development, more and more groundwater is extracted, especially in arid areas. If the groundwater management problem is not seriously considered, over extraction may lead to groundwater mining, salt water intrusion, and land subsidence. In fact, the quality of groundwater is gradually deteriorating throughout the world. The problem of groundwater pollution has appeared, not only in developed countries, but also in developing countries. Ground water pollution is a serious environmental problem that may damage human health, destroy the ecosystem, and cause water shortage.
Book Synopsis Monitored Natural Attenuation of Inorganic Contaminants in Ground Water by :
Download or read book Monitored Natural Attenuation of Inorganic Contaminants in Ground Water written by and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: V.3 ... consists of individual chapters that describe 1) the conceptual background for radionuclides, including tritium, radon, strontium, technetium, uranium, iodine, radium, thorium, cesium, plutonium-americium and 2) data requirements to be met during site characterization.
Book Synopsis Contaminants in the Subsurface by : National Research Council
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.
Book Synopsis Microscopic structure effect on the macroscopic property of geomaterials by : Qingxiang Meng
Download or read book Microscopic structure effect on the macroscopic property of geomaterials written by Qingxiang Meng and published by Frontiers Media SA. This book was released on 2023-03-17 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Chemical Transport in Soils by : Hossein Ghadiri
Download or read book Modeling Chemical Transport in Soils written by Hossein Ghadiri and published by CRC Press. This book was released on 1992-09-23 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling Chemical Transport in Soils: Natural and Applied Contaminants provides a comprehensive discussion of mathematical models used to anticipate and predict the consequences and fate of natural and applied chemicals. The book evaluates the strengths, weaknesses, and possibilities for application of numerous models used throughout the world. It examines the theoretical support and need for experimental calibration for each model. The book also reviews world literature to discuss such topics as the movement of sorbed chemicals by soil erosion, the movement of reactive and nonreactive chemicals in the subsurface and groundwater, and salt transport in the landscape. Modeling Chemical Transport in Soils: Natural and Applied Contaminants is an important volume for environmental scientists, agricultural engineers, regulatory personnel, farm managers, consultants, and the chemical industry.
Book Synopsis Alternatives for Ground Water Cleanup by : National Research Council
Download or read book Alternatives for Ground Water Cleanup written by National Research Council and published by National Academies Press. This book was released on 1994-02-01 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: There may be nearly 300,000 waste sites in the United States where ground water and soil are contaminated. Yet recent studies question whether existing technologies can restore contaminated ground water to drinking water standards, which is the goal for most sites and the result expected by the public. How can the nation balance public health, technological realities, and cost when addressing ground water cleanup? This new volume offers specific conclusions, outlines research needs, and recommends policies that are technologically sound while still protecting health and the environment. Authored by the top experts from industry and academia, this volume: Examines how the physical, chemical, and biological characteristics of the subsurface environment, as well as the properties of contaminants, complicate the cleanup task. Reviews the limitations of widely used conventional pump-and-treat cleanup systems, including detailed case studies. Evaluates a range of innovative cleanup technologies and the barriers to their full implementation. Presents specific recommendations for policies and practices in evaluating contamination sites, in choosing remediation technologies, and in setting appropriate cleanup goals.
Download or read book Petroleum Abstracts written by and published by . This book was released on 1993 with total page 1752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
