Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Subsurface Systems"”.
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Biodegradation of organic contaminants in subsurface systems: kinetic and metabolic considerations
… They also have the potential to migrate in the subsurface system achieving significant levels in drinking water supplies. In addition, they can serve as carriers for carcinogenic compounds such as benzene, toluene and xylene which are relatively insoluble in water, but are quite soluble in …
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Biodegradation of methanol and tertiary butyl alcohol in previously uncontaminated subsurface systems
… to determine the potential for biodegradation in subsurface soils and groundwater from sites in Williamsport, PA, Wayland, NY, and Dumfries, VA. These subsurface systems were characterized both physically, chemically and biologically. Bacterial populations were substantial in all systems and …
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Stochastic analysis of dense nonaqueous phase liquid dissolution in naturally heterogeneous subsurface systems
… dissolution in three-dimensional heterogeneous subsurface systems is investigated using a stochastic approach that treats the variability of flow properties as three-dimensional random fields. A steady-state, quasi-static DNAPL saturation distribution in a source zone is derived, based on the …
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Linear and nonlinear solvers for simulating high-temperature multiphase flow within large-scale engineered subsurface systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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CFD modelling of fluid flow and contaminant transport in hydrogeological systems
… of various aspects of hydrogeological systems modelling and the use of computational techniques to predict and optimise hydrological parameter assessment, anisotropic scaling, macrodispersion and solute flux measurements under unsteady, uniform/non-uniform flow conditions. The …
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Enhancement of biodegradation of methanol and tertiary butyl alcohol in groundwater systems
… because of their relatively high mobility in the subsurface. This study focused on the subsurface biodegradation of two octane-boosting additives, methanol and tertiary butyl alcohol (TBA). A microcosm study was undertaken to determine the <u>in situ</u> biotransformation rates. While both …
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Mass transfer from non-aqueous phase liquids to the aqueous phase in groundwater systems
… organic contaminants migrate through the subsurface environment, a significant portion of non-aqueous phase liquids (NAPL's) is trapped by capillary forces and remains in the subsurface as immobile blobs or ganglia. Residual saturations of NAPL on the order of 5-30 percent have been …
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Modeling injection and extraction wells for seawater desalination in SEAWAT
Subsurface intakes and disposal systems are gaining interest for seawater desalination in comparison with the older open ocean intake/discharge systems that induce many environmental problems. Facilities using reverse-osmosis technology to desalinate seawater require stringent feed water quality to …
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Reversible and irreversible adsorption of naphthalene and α-naphthol to soil
… significance of these processes in soils and the subsurface. This dissertation has been prepared as three separate articles for publication in peer reviewed journals. The first article serves as a literature review in evaluating the significance of oxidative coupling reactions in soil and …
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A New Paradigm Of Modeling Watershed Water Quality
… and chemical transport in watershed water systems enhance the ability of environmental scientists, engineers and decision makers to analyze the impact of contamination problems and to evaluate the efficacy of alternative remediation techniques and management strategies prior to incurring …
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Fate of metals in presence of minerals and mineral-organic assemblages
<p>Metals can enter aquatic systems from natural and anthropogenic processes associated with weathering, sediment re-suspension, industrial activities, and atmospheric deposition. Metals pose health and environmental risks at high concentrations due to their potential toxicity and bioaccumulation, …
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Chemistry of Nanoscale Solids and Organic Matter in Sustainable Water Management Systems
… engineered water treatment and management systems have been developed for purifying contaminated water and desalinating brackish or ocean water. These engineered systems provide substantial amounts of potable water and lessen environmental concerns about the release of contaminated water. …