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 20 of 25 for “"Environmental Geology"”.
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Economic evaluation of Gold-Sulphides Mineralization within the North Leader Congleomate at N0:5 Shaft of Blyvoorvitzicht Gold Mine South Africa
Department of Mining and Environmental Geology
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Environmental Impacts of Tin Mine Waste: A Case Study of the Zaaiplaats Tin Mine, Limpopo Province, South Africa
… were prepared and analysed at the Mining and Environmental Geology laboratory at the University of Venda using X-ray Fluorescence Spectrometry. The maximum values were 2842.4 ppm, 885.1 ppm, and 740.7 ppm for lead from Heap B followed by copper, and zinc from the river channel respectively. …
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Recovery of crude oil from saturated porous media as a function of geochemistry and wetting-phase dynamics for multiple remediation flushing strategies
A comprehensive study was performed to evaluate the mechanisms controlling mobilization of trapped nonaqueous phase liquid (NAPL) crude oil as a function of wetting phase dynamics and geochemistry during enhanced-flushing conditions. Synchrotron X-ray microtomography (SXM) was used to perform …
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Fully Coupled Finite Element Model to Study Multiple Hydraulic Fracturing in Heterogeneous Tight Formations
Hydraulic fracturing is a widely used technique in industry to enhance oil and gas recovery. The process involves the injection of fracking fluid with high pressure into the wellbore to propagate initial fractures generated during well perforation. It is a coupled process of fluid and rock …
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Pore scale study of crude oil distribution and interfacial processes in unconsolidated porous media: an application of synchrotron x-ray microtomography
A pore-scale study was conducted to determine model reservoir systems most amenable to oil recovery by investigating the behavior of three fractions of crude oil distribution and morphology in three types of porous media with increasing heterogeneity (in grain size distribution) during sequential …
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Effects of Freezing Temperature on Interface Shear Strength of Landfill Geosynthetic Liner
In modern days, municipal and hazardous waste containment facilities i.e., landfills are performance standard designed, well-engineered, operated, and monitored in compliance with federal regulations in 40 CFR Part 258 (Subtitle D of RCRA), or equivalent state regulations. Hence, application of …
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Electron donor contributions to denitrification in the Elk Valley Aquifer, North Dakota
Six denitrification tracer tests were performed over eight and a half years in in situ mesocosms (ISMs) in the Elk Valley Aquifer (EVA) in east-central North Dakota. Groundwater samples were analyzed to determine how much nitrate was lost beyond that explained by dilution of the bromide tracer. …
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Evaluation of Urban Riparian Buffers on Stream Health in the Tookany Watershed, PA
Stream channels and their corresponding riparian zones are composed of complex spatially and temporally dynamic systems. Changing land-use associated with urbanization has resulted in large shifts in riparian assemblages, stream hydraulics, and sediment dynamics leading to the degradation of the …
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MONITORING INFILTRATION FROM NATURAL STORMS USING TIME-LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY
Time-lapse electrical resistivity tomography (TL-ERT) enables an accurate characterization of the heterogeneity of flow through the unsaturated zone especially when compared to point measurements taken within the same survey area. The most powerful tool for understanding the unsaturated zone is a …
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Investigating nitrate attenuation in an urban stream using stable isotope geochemistry and continuous monitoring
Urbanization affects in-stream biogeochemical processes that control nutrient export. Attempts to restore urban streams will not be successful unless the biological and physical controls on water quality are thoroughly understood. The objective of this study was to identify the relative influences …
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Investigation of the Geology, Structural Setting and Mineralisation the Copper-Sulphide Deposits in the Messina Area, Limpopo Mobile Belt, South Africa
The study focused on the geology, structural setting and mineralisation of copper-sulphide deposits in the Musina area, located in the Central Zone of the Limpopo Mobile Belt of South Africa. The Messina copper deposits are located in the eastern part of Limpopo Province near the border with …
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Identifying water contamination from fossil fuel development using geochemical and isotopic fingerprints
… These studies have also demonstrated the environmental impact upon releasing of fossil fuels wastewater to the environment. The case studies support the use of geochemical and isotope tools as robust methods to not only identify contamination of water resources by fossil fuel-related …
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Geochemical and Isotopic Characterization of Coal Combustion Residuals: Implications for Potential Environmental Impacts
… characteristics of CCRs, as well as potential environmental impacts from CCRs. This investigation looks at several different aspects of CCR and environmental interactions from 1) the immediate impacts of the 2008 TVA coal ash spill in Kingston, TN, 2) the long-term (18-month) exposure of the …
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Uranium in groundwater and its potential as a natural contaminant in the Cherokee Basin, southeastern Kansas
Safe, easily accessible, clean, and potable water is critical for public health. The ingestion of radioactive nuclides such as uranium has been associated with renal and cancer-related issues in humans. Many previous studies have focused on anthropogenic uranium contamination. Here, we examined the …
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Assessing Two Centuries of Anthropogenic Impacts on Silver Lake, Summit County, Ohio
The increase in human population and human activities often negatively impacts the quality of our waters. Lake sediment often preserves a record of past anthropogenic activities and can be used to assess the impact of humans on the lake system. This study examines Silver Lake, a groundwater-fed …
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Development and Characterization of Controlled-Release Permanganate Gelfor Groundwater Remediation
This study focused on furthering the development of a novel, cost-effective scheme to remediate large, dilute plumes of DNAPLs in groundwater through the in-situ, well-based emplacement of concentrated permanganate solution mixed with a gelling agent. The controlled-release permanganate gel (CRP-G) …
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Sorption Characteristics of Veterinary Ionophore Antibiotics Monensin and Lasalocid and Soil Clay Constituents Kaolinite, Illite and Montmorillonite
<p>Monensin and Lasalocid are veterinary ionophore antibiotics used for therapeutic and non-therapeutic treatment of livestock. Manure containing un-metabolized compounds is in turn used as beneficial amendment for agricultural crops, thus, these compounds may be available for transport through …
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