[PDF] An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations - eBooks Review

An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations


An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations
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An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations


An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations
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Author : Michael R. Staples
language : en
Publisher:
Release Date : 2002-03-01

An Analysis Of Horizontal Flow Treatment Well Applicability For The Treatment Of Chlorinated Solvent Contaminated Groundwater At United States Forces Korea Installations written by Michael R. Staples and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-03-01 with Chlorohydrocarbons categories.


Past research has shown that there is a rising public concern with environmental issues in the Republic of Korea (ROK). As Korean government and public interest in the environment grow, there is likely to be increased pressure to remediate environmental contamination at United States Department of Defense (DoD) installations in Korea. Impacting DoD's ability to remediate contaminated sites overseas is the fact that limited environmental funds must compete with high priority mission requirements. Thus, particularly at overseas bases, there is an urgent need for inexpensive and effective groundwater remediation technologies. Horizontal Flow Treatment Well (HFTW) systems have been demonstrated in the U.S. to be an effective technology for managing groundwater contamination. However, the problem of finding a technology that is appropriate for use in Korea is particularly challenging due to the fractured aquifer systems that are ubiquitous throughout the Korean peninsula. The model analyses conducted in this study found that HFTWs have the potential to be a cost effective alternative to conventional technologies for contaminant management in the fractured media found in Korea. This study focused on the containment of groundwater contaminated with chlorinated solvents in the fractured rock aquifers that are commonly encountered at DoD installations in the ROK. Horizontal Flow Treatment Wells were analyzed as a potentially cheaper, safer, and more effective technology for the containment of chlorinated solvent contaminated groundwater. In this study, an HFTW numerical model that was developed for porous media was applied to the fractured systems encountered in the ROK. It was concluded that at the scale of interest, use of a porous media model was appropriate. Both hydrogeologic and design parameters were varied to determine their effects on the technology performance.



In Situ Treatment Of Chlorinated Ethene Contaminated Groundwater Using Horizontal Flow Treatment Wells


In Situ Treatment Of Chlorinated Ethene Contaminated Groundwater Using Horizontal Flow Treatment Wells
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Author : Derek R. Ferland
language : en
Publisher:
Release Date : 2000-03-01

In Situ Treatment Of Chlorinated Ethene Contaminated Groundwater Using Horizontal Flow Treatment Wells written by Derek R. Ferland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-03-01 with Groundwater categories.


The limitations of conventional containment technologies for groundwater contaminated with chlorinated solvents have motivated development of innovative technologies to achieve national groundwater remediation objectives. One inn9vative technology that is currently under development involves metal reductants or catalysts to chemically destroy the dissolved chlorinated solvent. Models are important tools that can be used to help transition this technology to the field. Model studies can be used to gain understanding about the technology, help determine when the prospective technology might work for a given site, and design full-scale field applications.



Treatment Of Chlorinated Aliphatic Contamination Of Groundwater By Horizontal Recirculation Wells And By Constructed Vertical Flow Wetlands


Treatment Of Chlorinated Aliphatic Contamination Of Groundwater By Horizontal Recirculation Wells And By Constructed Vertical Flow Wetlands
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Author : Michael L. Shelley
language : en
Publisher:
Release Date : 2002-03-01

Treatment Of Chlorinated Aliphatic Contamination Of Groundwater By Horizontal Recirculation Wells And By Constructed Vertical Flow Wetlands written by Michael L. Shelley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-03-01 with categories.


This work explores two innovative technologies for the remediation of chlorinated ethene solvents contaminating groundwater: (1) groundwater circulation wells (GCWs) with downwell zero-valent metal reductive dechlorination reactors, and (2) constructed vertical subsurface flow wetlands. Both the natural dechlorination in wetland sediments, and the engineered dechlorination in a well using zero-valent metals have major implications for the treatment of Air Force pollutants, with the potential to save millions of dollars annually in long term remediation at hundreds of sites across the Air Force. Complementary modeling and column studies examined the potential for controlling and treating groundwater contamination using groundwater circulation wells (GCWs) with downwell zero-valent metal reductive dechlorination reactors. The construction of the field scale wetland research facility includes two complete wetland cells (140 x 60 feet each), fully contained. Chemical analysis of samples drawn from the various depths of wetland sediment suggests a very heterogeneous development of microbial activity relevant to reductive dechlorination over the course of one year of operation. Concentration contours of PCE, TCE, and nitrate suggest that reductive dechlorination is taking place when more readily reducible electron acceptors (like nitrate) are depleted. PCE is reduced ten-fold from inflow to outflow, even with significant short- circuiting of flow from the bottom sediments to the outflow. Data suggests 100- fold treatment is possible.



Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Perchlorate Contaminated Groundwater


Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Perchlorate Contaminated Groundwater
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Author : Jeffrey C. Parr
language : en
Publisher:
Release Date : 2002-03-01

Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Perchlorate Contaminated Groundwater written by Jeffrey C. Parr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-03-01 with Groundwater categories.


Groundwater contamination by perchlorate has recently been recognized as a significant environmental problem across the United States, and especially at Department of Defense facilities. In this study, a model is used to evaluate the potential of a innovative in situ bioremediation technology using Horizontal Flow Treatment Wells (HFTWs) to manage perchlorate-contaminated groundwater. The technology uses HFTWs to mix an electron donor into perchlorate-contaminated groundwater in order to promote reduction of the perchlorate by indigenous microorganisms in bioactive zones within the aquifer, as well as recirculate the contaminated water between treatment well pairs to achieve multiple passes of contaminated water through the bioactive zones. The model used in this study couples a three-dimensional fate and transport model, which simulates advective/ dispersive transport of solutes induced by regional groundwater flow and operation of the HFTW's, with a biodegradation model that simulates perchlorate reduction, as well as reduction of competing electron acceptors in the groundwater, by indigenous microorganisms. The model was applied to an example site to demonstrate how in situ perchlorate treatment might be implemented. A sensitivity analysis using the model is also conducted to evaluate which engineered and environmental parameters most affect technology performance. Model simulation results demonstrate that this technology may be effective in managing perchlorate-contaminated groundwater. The recirculation induced by the HFTW system results in increased treatment efficiency, as compared to treatment that would be achieved by a single pass of contaminated water through the bioactive zones. It was observed that the model was very sensitive to several kinetic parameters, indicating that a fruitful area for future research would be to study how these important parameters can be accurately quantified for given geochemical and microbiological conditions.



Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Mtbe Contaminated Groundwater


Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Mtbe Contaminated Groundwater
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Author : Preston F. Rufe
language : en
Publisher:
Release Date : 2004-03-01

Application Of Horizontal Flow Treatment Wells For In Situ Treatment Of Mtbe Contaminated Groundwater written by Preston F. Rufe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-03-01 with Butyl methyl ether categories.


This study utilized a three-dimensional numerical model to evaluate the potential application of HFTWs to manage MTBE-contaminated groundwater. HFTWs consist of two dual-screened treatment wells. One well operates in an upflow mode, with MTBE-contaminated water extracted from an aquifer through a screen in the deep portion of an aquifer and injected into the aquifer through a shallow well screen, while the adjacent well operates in a downflow mode, extracting water from the shallow zone of the aquifer and injecting it into the deep zone. As the MTBE-contaminated water flows through the wells, an electron acceptor and/or another electron donor is introduced in order to promote oxidation of MTBE by indigenous microorganisms that grow in bioactive zones adjacent to the injection screens of the treatment wells. The model used in this study couples a model that simulates the complex three-dimensional flow field that results from HFTW operation with a transport model to simulate MTBE fate due to advective/dispersive transport and biodegradation. The biodegradation model allows simulation of either direct or cometabolic oxidation of MTBE by indigenous microorganisms. The model was applied to a hypothetical MTBE- contaminated site to demonstrate how this technology might effect in situ MTBE treatment. A sensitivity analysis was conducted using the model to determine the engineering and environmental parameters that impact technology performance. This study demonstrates that the HFTW technology has potential for application in managing MTBE-contaminated groundwater.



Determination Of Chlorinated Solvent Contamination In An Upward Flow Constructed Wetland


Determination Of Chlorinated Solvent Contamination In An Upward Flow Constructed Wetland
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Author : Bryan C. Opperman
language : en
Publisher:
Release Date : 2002-03-01

Determination Of Chlorinated Solvent Contamination In An Upward Flow Constructed Wetland written by Bryan C. Opperman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-03-01 with Constructed wetlands categories.


The purpose of this study is to determine chlorinated solvent contamination levels in an upward flow constructed wetland at Wright-Patterson Air Force Base (WPAFB), Ohio. A stratified grid sampling methodology will be used in sampling the contaminated groundwater. Analysis will be accomplished by means of purge-and-trap gas chromatography. The contaminant concentration levels will be used to enhance the design and construction of man-made wetlands used to remove chlorinated solvents from aquifers. PCE levels declined from an average of 33.97 ppb in the inflow stream to an average of 3.65 ppb in the upper layer, a 91% reduction. High concentrations occurred in areas where high hydraulic pressure gradients and hydraulic conductivities combined to allow contaminated water to migrate to the upper layers of the wetland with minimal contact time for reduction. Removing these areas from the data set increased the PCE reduction efficiency to nearly 98% with an upper level concentration average of 0.84 ppb. Trichloroethene (TCE) inflow rates averaged 0.63 ppb while TCE concentrations in the upper layer averaged 0.175 ppb. TCE concentrations peaked in the middle layer of the wetland suggesting that reduction of PCE was occurring there and in the bottom layer.



Modeling The Effect Of Nonlinear And Rate Limited Sorption On The Natural Attenuation Of Chlorinated Ethenes


Modeling The Effect Of Nonlinear And Rate Limited Sorption On The Natural Attenuation Of Chlorinated Ethenes
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Author : Peter P. Feng
language : en
Publisher:
Release Date : 2000-03-01

Modeling The Effect Of Nonlinear And Rate Limited Sorption On The Natural Attenuation Of Chlorinated Ethenes written by Peter P. Feng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-03-01 with Chlorohydrocarbons categories.


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.



Treatment Wetlands


Treatment Wetlands
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Author : Robert H. Kadlec
language : en
Publisher: CRC Press
Release Date : 2008-07-22

Treatment Wetlands written by Robert H. Kadlec and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-22 with Nature categories.


Completely revised and updated, Treatment Wetlands, Second Edition is still the most comprehensive resource available for the planning, design, and operation of wetland treatment systems. The book addresses the design, construction, and operation of wetlands for water pollution control. It presents the best current procedures for sizing these syste



Treatment Technologies For Solvent Containing Wastes


Treatment Technologies For Solvent Containing Wastes
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Author : M. Breton
language : en
Publisher: William Andrew
Release Date : 1988-12-31

Treatment Technologies For Solvent Containing Wastes written by M. Breton and has been published by William Andrew this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-12-31 with Science categories.




Arsenic Treatment Technologies For Soil Waste And Water


Arsenic Treatment Technologies For Soil Waste And Water
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2002

Arsenic Treatment Technologies For Soil Waste And Water written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Arsenic wastes categories.