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 128 for “"Total dissolved solids"”.
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Determining a Total Dissolved Solids Release Index from Overburden in Appalachian Coal Fields
… may not adequately predict the release of total dissolved solids (TDS). High concentrations of TDS have been linked to a decrease in survival of aquatic macroinvertebrates. Our objective was to determine the effect of different solutions on overburden dissolution, and to develop a TDS …
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Effect of Leaching Scale on Prediction of Total Dissolved Solids Release from Coal Mine Spoils and Refuse
… environmental impacts including elevated total dissolved solids (TDS) levels in receiving streams. Column leaching procedures are recommended by many studies for TDS prediction, but many question their applicability to field conditions. The objective of this study was to assess results …
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Biological and Membrane Treatment Applications for the Reduction of Specific Conductivity and Total Dissolved Solids in Coal Mine Waters
Specific conductivity (SC) and total dissolved solids (TDS) are increasingly being used as a parameter used to judge the aquatic health of streams that are impacted by coal mining operations in the Appalachian region of the United States. Due to this, government environmental regulatory bodies have …
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Assessment of the Quality of Domestic water in Kinondoni District, Dar es salaam, Tanzania
… were: (i) to determine levels of fecal and total coliform bacteria in domestic water supplied from private wells (boreholes) and water trucks, and compare these with the Tanzania Drinking Water Standards of 2008; (ii) to assess the physical quality of domestic water using pH, turbidity, …
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Dynamic Sensing of a Dynamic System: Mobile Water Quality Monitoring at Spring Lake, San Marcos, Texas
… more than 35,000 individual data points for total dissolved solids and temperature, providing high-resolution coverage of water-quality conditions in Spring Lake. I applied data-quality control procedures to remove incomplete or anomalous measurements and uploaded the cleaned dataset into a …
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Geohydrology of the McVille Aquifer Nelson County, Northeastern North Dakota
… of the aquifer with a range of 273-935 mg/l total dissolved solids. Water in the northwestern section is of the sodium-bicarbonate or sulfate type with a range of 1200-2400 mg/l total dissolved solids.</p>
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The geohydrology and hydrogeochemistry of the proposed Garrison Lignite Mine
… the groundwater in the till is generally high in total dissolved solids with dominant concentrations of sodium, calcium, bicarbonate, and sulfate. By passing through silty clay into lignite, total dissolved solids decrease and there are dominant concentrations of sodium, bicarbonate, and sulfate. …
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Performance Evaluation of a Low Impact Development Retrofit for Urban Stormwater Treatment
… demanding substances, selected trace metals and total petroleum hydrocarbons. Negative performance was observed for oxidized nitrogen, total dissolved solids and oil & grease. LID facility influent and effluent loads were also compared using the Effluent Probability Method (EPM). The EPM analysis …
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Emerging Contaminants: Occurrence of ECs in Two Virginia Counties Private Well Water Supplies and Their Removal from Secondary Wastewater Effluent
… quality constituents (nitrate, bacteria, pH and total dissolved solids) to EC occurrence in private water supplies; and 4) determine the ability of the MicroEvapTM, a novel wastewater treatment technology, to remove ECs from secondary wastewater effluent. In partnership with the Virginia …
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Desalination of brackish groundwater in the United States : minimum energy requirements
… of recovery ratio and the following parameters: total dissolved solids, specific conductance, ionic strength, and molality. Lastly, we examine the effects of groundwater composition on minimum energy costs, and the geographic distribution of total dissolved solids, well depth and major ions.
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Frac flowback water blending and treatment requirements based on spatial and temporal water quality analysis
… were analyzed for temporal and spatial levels of total dissolved solids (TDS), sodium, chloride, calcium, and iron. Concentration of total dissolved solids, sodium, chloride and calcium were modeled to accommodate the different temporal functions in each Integrated Development Plan; the temporal …
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Low Interfacial Tension Foam Miscible Ethane Oil Recovery in Low Permeability Harsh Environments
… harsh environments (<15md, 136,000ppm total dissolved solids with divalent ions, 74°C). Minimum miscibility pressure displacement tests were performed for dead crude oil from the Wolfcamp Spraberry trend area using ethane and carbon dioxide, showing a lower MMP for ethane. A surfactant …
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Hydrochemical Assessment and Modelling of Groundwater Quality of an Urban Aquifer Near A Sanitary Landfill
… principal components, covering 80.7% of the total variance. Boxplots which show the variation of indicators suggests possible groundwater contamination from landfill operation. Wilcox diagrams indicate groundwater near landfill was not suitable for irrigation. Dual-step multiple linear …
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Carbon Dioxide Flooding Induced Geochemical Changes in a Saline Carbonate Aquifer
… from 1,000 ppm to greater than 300,000 ppm total dissolved solids. Sodium chloride (NaCl) is the primary salt of the formation waters of the Madison Group. Water-alternating-gas (WAG) flooding experiments were conducted on limestone rock cores using a core flooding system that simulates the …
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Hydrochemical facies study of ground water in the Tucson Basin
… constituents are included in this study: total dissolved solids, calcium, magnesium, sodium, potassium, chloride, sulfate, bicarbonate, pH, nitrate, fluoride, strontium and zinc. A conceptual process-response model relates the regional distribution of dissolved constituents to the …
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The Effects of Stream Crossings and Associated Road Approaches on Water Quality in the Virginia Piedmont
… and below each crossing and were evaluated for total dissolved solids (TDS), pH, conductivity, water temperature, and total suspended solids (TSS) or sediment concentration. Steel bridge crossings generally caused the least amount of water quality disturbance. Model-generated estimates of …
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Transport of perchlorate in the Las Vegas Wash and Lake Mead
… Lake, and to correlate perchlorate levels with total dissolved solids concentrations. Investigation showed that multiple sources contribute to the perchlorate contamination in the Wash. Perchlorate levels had increased significantly from 1995. Lake stratification strongly influences perchlorate …
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Groundwater Hydrogeolgy and Hydrochemistry of Karst Springs in the Eastern Peninsula of Fort Hood Military Installation
… TCEQ regulated analytes, with the exception of total dissolved solids. Of the springs sampled the chemical profiles of springs to the north were epigenetic in composition and those to the south expressed more hypogenetic influences.</p>
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Shallow Groundwater Quality in Alberta (Canada) with a Focus on the Occurrence of Nitrate and Methane
… with 9.7% of these samples (3.1% of total samples) exceeding Health Canada’s health-based maximum acceptable concentration of 45 mg NO3/L. Additionally, it was observed that samples exceeded the Health Canada aesthetic objective for total dissolved solids, sodium, sulphate, and …
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