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Full-Text Articles in Engineering

Effects Of Ozonation During Ceramic Microfiltration Of Water Containing Natural Organic Matter, Evan Martin Owen Jan 2019

Effects Of Ozonation During Ceramic Microfiltration Of Water Containing Natural Organic Matter, Evan Martin Owen

Civil Engineering Graduate Theses & Dissertations

The application of low-pressure membrane filtration such as microfiltration (MF) and ultrafiltration (UF) have become progressively well-established in the drinking and wastewater technology industry over the past few decades. While polymeric membranes dominate this sector of the water industry, ceramic membranes have become an increasingly popular and advantageous alternative to polymeric materials. Most importantly, ceramic membranes can be effectively employed to treat high-fouling impaired quality source water because of the inherent material robustness, that can withstand in-situ oxidative cleaning regimes.

Given the ozone (O3)-resistant nature of ceramic membranes, this research demonstrated that preozonation plays a crucial role in both ...


Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley Jan 2019

Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley

Civil Engineering Graduate Theses & Dissertations

Hydraulic fracturing simultaneously uses and generates billions of gallons of water every year that must be sourced and managed. Fracturing fluid chemicals, including many ethoxylated and propoxylated surfactants, are added to water to make fracturing fluid. Flowback and produced water, the primary contributors to the waste stream, are generated during the drilling operations and throughout the life of the well.

Inherent to developing a management approach is adequate methods of characterization and treatment for dissolved components. This research presents the development of a solid phase extraction method for identifying and detecting common fluid additives with mass spectrometry (MS). With this ...


Dynamics Of Solute Transport And Rare Earth Element Behavior In Acid Mine Drainage Impacted Alpine Rivers, Snake River Co, Jordan Elizabeth Carroll Dec 2017

Dynamics Of Solute Transport And Rare Earth Element Behavior In Acid Mine Drainage Impacted Alpine Rivers, Snake River Co, Jordan Elizabeth Carroll

Civil Engineering Graduate Theses & Dissertations

Quantifying and understanding the transport of rare earth elements (REEs) in relation to heavy metals within acidic alpine rivers is relatively understudied. However, employing solute transport models, specifically One-Dimensional Transport with Inflow and Storage (OTIS) can provide insight on the reactivity and transport of REEs. The Snake River is located along the Colorado Mineral Belt in Summit County, Colorado and drains into metropolitan Denver’s drinking water source – Dillon Reservoir. The Snake River is of particular interest due to its hydrological and geochemical similarity to other alpine streams impacted by acid mine drainage throughout Colorado.

In previous studies, most REEs ...


Thermal Regeneration Of Biochar For Adsorption Of Synthetic Organic Contaminants In The Presence Of Dissolved Organic Matter, Benjamin Glenn Greiner Jan 2017

Thermal Regeneration Of Biochar For Adsorption Of Synthetic Organic Contaminants In The Presence Of Dissolved Organic Matter, Benjamin Glenn Greiner

Civil Engineering Graduate Theses & Dissertations

Biochar is emerging as a cost effective carbonaceous adsorbent for removing pollutants such as synthetic organic contaminants (SOCs) from wastewater, stormwater, and drinking water sources. However, relative to commercial activated carbon (AC), biochar fouls rapidly when applied in a flow-through column in the presence of background dissolved organic matter (DOM). Thermal regeneration is a promising process for regaining adsorption capacity in fouled biochar. In this study, 850 °C pine biochar was fouled in a column with environmentally relevant concentrations of sulfamethoxazole (SMX) and DOM, then heated in a second semi-oxic thermal regeneration step at 600 °C. The treatment resulted in ...


Biochar Sorbents For The Control Of Organic Contaminants In Stormwater: Understanding Biochar Structure And Water Quality On Sorption Behavior, Kyle Koyu Shimabuku Jan 2017

Biochar Sorbents For The Control Of Organic Contaminants In Stormwater: Understanding Biochar Structure And Water Quality On Sorption Behavior, Kyle Koyu Shimabuku

Civil Engineering Graduate Theses & Dissertations

Stormwater is a major contributor of organic contaminants (OCs) in aquatic environments and there is growing interest in harvesting it as a new water supply. Biochar sorbents are a promising technology to control OCs in stormwater. Biochar physicochemical properties, which determine its performance, vary widely depending on its production conditions. Modeling OC sorption by biochar is challenging because of the heterogeneous-physicochemical properties of OCs and biochars that interact through different sorption mechanisms. In addition, stormwater contains dissolved organic matter (DOM) that fouls OC sorption. When DOM is present, the proportional removal of OCs is independent of their initial concentration until ...


Dynamics Of Solute Transport And Rare Earth Element Behavior In Acid Mine Drainage Impacted Alpine Rivers, Snake River Co, Jordan Elizabeth Carroll Jan 2017

Dynamics Of Solute Transport And Rare Earth Element Behavior In Acid Mine Drainage Impacted Alpine Rivers, Snake River Co, Jordan Elizabeth Carroll

Civil Engineering Graduate Theses & Dissertations

Quantifying and understanding the transport of rare earth elements (REEs) in relation to heavy metals within acidic alpine rivers is relatively understudied. However, employing solute transport models, specifically One-Dimensional Transport with Inflow and Storage (OTIS) can provide insight on the reactivity and transport of REEs. The Snake River is located along the Colorado Mineral Belt in Summit County, Colorado and drains into metropolitan Denver’s drinking water source – Dillon Reservoir. The Snake River is of particular interest due to its hydrological and geochemical similarity to other alpine streams impacted by acid mine drainage throughout Colorado.

In previous studies, most REEs ...


Biochar Sorbents For The Control Of Organic Contaminants In Stormwater: Understanding Biochar Structure And Water Quality On Sorption Behavior, Kyle Koyu Shimabuku Jan 2017

Biochar Sorbents For The Control Of Organic Contaminants In Stormwater: Understanding Biochar Structure And Water Quality On Sorption Behavior, Kyle Koyu Shimabuku

Civil Engineering Graduate Theses & Dissertations

Stormwater is a major contributor of organic contaminants (OCs) in aquatic environments and there is growing interest in harvesting it as a new water supply. Biochar sorbents are a promising technology to control OCs in stormwater. Biochar physicochemical properties, which determine its performance, vary widely depending on its production conditions. Modeling OC sorption by biochar is challenging because of the heterogeneous-physicochemical properties of OCs and biochars that interact through different sorption mechanisms. In addition, stormwater contains dissolved organic matter (DOM) that fouls OC sorption. When DOM is present, the proportional removal of OCs is independent of their initial concentration until ...


Wildfire Disturbances To Water Quality: Implications For Drinking Water Treatment, Amanda Kay Hohner Jan 2016

Wildfire Disturbances To Water Quality: Implications For Drinking Water Treatment, Amanda Kay Hohner

Civil Engineering Graduate Theses & Dissertations

The recent increase in wildfire activity has raised concerns among water utilities that rely on forested watersheds. Wildfires can alter the vegetation, soils, and hydrologic processes of watersheds serving as water supplies, which may negatively influence source water quality and treatment. An understanding of post-fire treatment challenges, and guidance on how water providers can prepare is needed.

To understand the impacts of wildfire on dissolved organic matter (DOM), disinfection byproduct (DBP) reactivity, and drinking water treatability, three approaches were taken: 1) a water intake below a burned watershed was monitored following a Colorado wildfire; 2) charred, riverbank sediment deposits were ...


Wavelength-Specific Effects Of Ultraviolet Light On Microorganisms And Viruses For Improving Water Disinfection, Sara Elizabeth Beck Jan 2015

Wavelength-Specific Effects Of Ultraviolet Light On Microorganisms And Viruses For Improving Water Disinfection, Sara Elizabeth Beck

Civil Engineering Graduate Theses & Dissertations

This research assessed the wavelength-specific effects of germicidal ultraviolet (UV) irradiation on viruses and microorganisms. Every organism has a unique spectral sensitivity to UV irradiation, called its action spectrum. In many cases, the action spectra of bacteria strongly correlate with their DNA or RNA absorbance. For many viruses, however, the action spectra deviate from the UV absorbance of their DNA or RNA, suggesting that mechanisms other than nucleic acid damage are contributing to their UV inactivation.

This research determined the UV spectral sensitivity of Cryptosporidium parvum, adenovirus 2 and coliphage MS2, T1UV, Q Beta, T7, and T7m. Two viruses, MS2 ...


Use Of Fluorescence Spectroscopy To Characterize Dissolved Organic Matter, Julie Ann Korak Jan 2014

Use Of Fluorescence Spectroscopy To Characterize Dissolved Organic Matter, Julie Ann Korak

Civil Engineering Graduate Theses & Dissertations

Dissolved organic matter (DOM) is a heterogeneous mixture of organic molecules derived from a variety of sources (plant and microbial) and is ubiquitous to all natural water sources. DOM removal is a core treatment objective for water treatment plants to prevent the formation of disinfection byproducts (DBPs). Due to its complex nature, current understanding of DOM and its effects on drinking water quality relies on bulk characterization methods, such as fluorescence spectroscopy. Fluorescence measures a fraction of DOM that is optically active and has the potential to absorb and reemit light. This thesis investigated how the optical properties of DOM ...