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Full-Text Articles in Engineering
Chemical Interfacial Reactions Affecting The Speciation And Solubility Of Uranium In Organic-Rich Environments, Carmen A. Velasco
Chemical Interfacial Reactions Affecting The Speciation And Solubility Of Uranium In Organic-Rich Environments, Carmen A. Velasco
Civil Engineering ETDs
The aim of this dissertation was to investigate the interfacial reactions between uranium (U) and natural organic matter NOM) affecting the solubility, adsorption, and precipitation of U in organic-rich environments. The chemical interactions between U and NOM are not well understood, which justified the following research objectives: 1) Identify the effect of pH on U speciation and the organic functional chemistry in mineralized deposits from the Jackpile Mine.; 2) Identify the precipitation of U(VI) and NOM as a function of pH (2, 4 and 7); 3) Identify changes in DOM chemistry due to the reaction of NOM and U at …
Effect Of Membrane Aging And Operating Conditions On The Rejection Of Trace Organics For Potable Reuse, Jose Pedro Hernandez
Effect Of Membrane Aging And Operating Conditions On The Rejection Of Trace Organics For Potable Reuse, Jose Pedro Hernandez
Civil Engineering ETDs
The aim of this study is to provide a better understanding of the effect that membrane degradation and operating conditions have on the removal of selected organic compounds via reverse osmosis (RO). Originally, the study included laboratory experiments in which ESPA2-LD membranes from Hydranautics were to be chemically damaged and the passage of the suite of trace organics through the membranes was to be evaluated. Unfortunately, the degradation experiments were cut short due to lab closures associated with the COVID-19 pandemic. The study then changed direction to provide insight into the role operating conditions have on the removal of trace …
Biogeochemical Processes Affecting Arsenic (As) Release And Bioavailability Near Abandoned Mine Wastes, Cherie L. Devore
Biogeochemical Processes Affecting Arsenic (As) Release And Bioavailability Near Abandoned Mine Wastes, Cherie L. Devore
Civil Engineering ETDs
The aim of this dissertation was to investigate the biogeochemical processes affecting the mobilization and bioavailability of arsenic (As) from mining-impacted sediments to surface water sources and plants. The Cheyenne River Watershed has been affected by mining legacy for several decades. The biogeochemical cycling of As on tribal land is not well understood, which justified the following research objectives: 1) Investigate the effect of competing anions on the release of As from sediments exposed to oxidizing conditions; 2) Evaluate chemical and microbiological processes affecting the release of soluble As, Fe, and Mn from contaminated sediments under laboratory controlled aerobic and …