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Transport, Targeting, and Applications of Metallic Functional Nanoparticles for Degradation of DNAPL Chlorinated Organic solvents

Description: The goals of this project have been to synthesize reactive metal colloids capable of: (1) reductively degrading chlorinated solvents, (2) being transported in porous media, and (3) partitioning from aqueous to non-aqueous solvents or accumulating at water/organic solvent interfaces. This project addresses the need for methods to efficiently remove or degrade dense non-aqueous phase liquid (DNAPL) contaminants, and that act as long-term sources of groundwater contamination through slow solubiliz… more
Date: June 30, 2004
Creator: Redden, George D.; Ginosar, Dan; Meakin, Paul & Rollins, Harry
Partner: UNT Libraries Government Documents Department
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Hybrid Numerical Methods for Multiscale Simulations of Subsurface Biogeochemical Processes

Description: Many subsurface flow and transport problems of importance today involve coupled non-linear flow, transport, and reaction in media exhibiting complex heterogeneity. In particular, problems involving biological mediation of reactions fall into this class of problems. Recent experimental research has revealed important details about the physical, chemical, and biological mechanisms involved in these processes at a variety of scales ranging from molecular to laboratory scales. However, it has not b… more
Date: August 1, 2007
Creator: Scheibe, Timothy D.; Tartakovsky, Alexandre M.; Tartakovsky, Daniel M.; Redden, George D. & Meakin, Paul
Partner: UNT Libraries Government Documents Department
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SecurEarth: A Crosscutting Initiative for the Geo- and Environmental Sciences

Description: Description of a presentation to be given at the 2006 Environmental Subsurface Science Symposium about the SECUREarth program, intended to address resource and environmental issues.
Date: September 1, 2006
Creator: Redden, George D.; Bodvarsson, Bo; Majer, Ernie; Colwell, Rick & Palmer, Carl D.
Partner: UNT Libraries Government Documents Department
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Coupling Between Flow and Precipitation in Heterogeneous Subsurface Environments and Effects On Contaminant Fate and Transport

Description: Reactive mixing fronts can occur at large scales, e.g. when chemical amendments are injected in wells, or at small scales (pore-scales) when reactive intermediates are being generated in situ at grain boundaries, cell surfaces and adjacent to biofilms. The product of the reactions such as mineral precipitates, biofilms or filtered colloids modifies permeability leading to the complex coupling between flow and reactions and precipitation. The objectives are to determine how precipitates are dist… more
Date: June 2006
Creator: Tartakovsky, Alexandre M.; Redden, George D.; Fujita, Yoshiko; Scheibe, Tim; Smith, Robert; Reddy, Michael et al.
Partner: UNT Libraries Government Documents Department
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ADVANCING REACTIVE TRACER METHODS FOR MONITORING THERMAL DRAWDOWN IN GEOTHERMAL ENHANCED GEOTHERMAL RESERVOIRS

Description: Reactive tracers have long been considered a possible means of measuring thermal drawdown in a geothermal system, before significant cooling occurs at the extraction well. Here, we examine the sensitivity of the proposed method to evaluate reservoir cooling and demonstrate that while the sensitivity of the method as generally proposed is low, it may be practical under certain conditions.
Date: October 1, 2010
Creator: Plummer, Mitchell A.; Palmer, Carl D.; Mattson, Earl D.; Redden, George D. & Hull, Laurence C.
Partner: UNT Libraries Government Documents Department
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Advancing Reactive Tracer Methods for Measurement of Thermal Evolution in Geothermal Reservoirs: Final Report

Description: The injection of cold fluids into engineered geothermal system (EGS) and conventional geothermal reservoirs may be done to help extract heat from the subsurface or to maintain pressures within the reservoir (e.g., Rose et al., 2001). As these injected fluids move along fractures, they acquire heat from the rock matrix and remove it from the reservoir as they are extracted to the surface. A consequence of such injection is the migration of a cold-fluid front through the reservoir (Figure 1) that… more
Date: July 1, 2011
Creator: Plummer, Mitchell A.; Palmer, Carl D.; Mattson, Earl D.; Hull, Laurence C. & Redden, George D.
Partner: UNT Libraries Government Documents Department
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FLUID FLOW, SOLUTE MIXING AND PRECIPITATION IN POROUS MEDIA

Description: Reactions that lead to the formation of mineral precipitates, colloids or growth of biofilms in porous media often depend on the molecular-level diffusive mixing. For example, for the formation of mineral phases, exceeding the saturation index for a mineral is a minimum requirement for precipitation to proceed. Solute mixing frequently occurs at the interface between two solutions each containing one or more soluble reactants, particularly in engineered systems where contaminant degradation or … more
Date: September 1, 2006
Creator: Redden, George D; Fang, Y.; Scheibe, T.D.; Tartakovsky, A.M.; Fox, Don T; Fujita, Yoshiko et al.
Partner: UNT Libraries Government Documents Department
open access

EMSL Pore Scale Modeling Challenge/Workshop

Description: Report covers the background for the workshop, objectives, important research directions, necessary capabilities and overall recommendations.
Date: August 9, 2011
Creator: Hess, Nancy J.; Oostrom, Martinus; Celia, Michael A.; Hilpert, Markus; Kang, Qinjun; Pyrak-Nolte, Laura J. et al.
Partner: UNT Libraries Government Documents Department
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