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 20 for “"organic contaminant"”.
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Organic Contaminant Release from Melting Snow
Snow efficiently scavenges organic contaminants from the atmosphere. Those chemicals can be released in short, concentrated pulses during spring snowmelt, potentially affecting both aquatic and terrestrial environments. In order to investigate the behavior of organic contaminants in melting snow …
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Determinants and Developmental Consequences of Organic Contaminant Uptake in Nestling Insectivorous Birds
… Pelee National Park, Ontario, Canada and their contaminant contents. Another route of exposure in oviparous organisms is through their eggs, so the contaminant contents in eggs of each population were analyzed. Nestlings’ growth rates were measured in the field from which values consumption …
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Lumped approach for sorption of organic contaminant mixtures to simulated aquifer sorbents
… approach to describe the sorption of 12 neutral organic compounds (NOCs), 6 polar NOCs (acetone, 2-butanone, 2-hexanone, phenol, p-cresol, and 2,4-dimethyl phenol) and 6 nonpolar NOCs (1,2,4-trichlorobenzene, 1,4-dichlorobenzene, chlorobenzene, m-xylene, toluene, benzene), in mixtures to …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… which is commonly used in remediation for organic contaminant degradation. The degradation of various organic contaminants during aerobic oxidation of Fe(II) species without addition of exogenous peroxide has also been demonstrated, suggesting that oxidation of natural organic matter and …
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SYNTHESIS, CHARACTERIZATION OF 3D GRAPHENE-BASED MACROASSEMBLIES AND THEIR ENVIRONMENTAL REMEDIATION APPLICATIONS
… photocatalysts using a model recalcitrant organic contaminant under visible light irradiation. Additionally, insights into the underlying mechanism behind the photocatalytic degradation of recalcitrant organic pollutants by 3D GMAs are provided.
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Impact of Reconstructed Wetlands on the Tree Swallow (Tachycineta bicolor)
… to evaluate the bioavailability and effect of contaminants to terrestrial life at reconstructed wetlands, Kingman Lake and Kenilworth Marsh, on the Anacostia River. Nesting success, survival, growth and developmental parameters were recorded and compared to an established reference location. …
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Investigation into an adsorption and electrochemical regeneration process for the treatment of two trace level pesticides
The presence of organic micro-pollutants in aquatic systems and drinking water is of concern in most highly populated regions of the planet. Extensive surveys of major river systems in Europe and the United States have measured a wide array of organic contaminants including industrial chemicals, …
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Modeling contaminant transport in polyethylene and metal speciation in saliva
Properties of both chemical contaminants and polymers can impact contaminant diffusivity and solubility in new and aged polyethylene materials for pipes and geomembranes. Diffusivity, solubility, polymer and chemical properties were measured for thirteen contaminants and six polyethylene materials …
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Physiochemical and Biological Behaviors of Organic Contaminants in Multi-Phase Media Under Enhanced Treatment Conditions
… activities has led to the ubiquitous presence of organic contaminants. There is an urgent need for understanding the fate and behavior of organic contaminants in the environment. In this dissertation research, the physiochemical and biological behaviors of organic contaminants in multi-phase media …
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Predictive Modeling of Organic Pollutant Leaching and Transport Behavior at the Lysimeter and Field Scales
… and mechanized agriculture. Some contaminants such as PAHs may persist in the subsurface for decades and centuries. In a bid to address these issues, protection of groundwater must be based on the quantification of potential threats to pollution at the subsurface which is often …
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Combining chemical with biological oxidation for efficient treatment of chloronitrobenzene in groundwater
… products. CNB has been recognized as a toxic organic contaminant to humans and is recalcitrant to microbial biodegradation in anoxic environments. When receptors are threatened by CNB-contaminated groundwater, regulators may demand immediate remedial approaches, such as advanced oxidation …
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Effects of fluorine modifiers and gold colloids in enhancing photocatalytic activity of TiO2 under visible light irradiation
… a light-activated catalyst is used to break down organic contaminant is known as photocatalysis. In the class of photocatalyst, titanium dioxide (TiO2) has isolated itself on top of the list and widely applied in environmental remediation including water treatment. In addition to the worrying …
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Electrocatalytic treatment of wastewaters
… order to obtain a complete understanding of the organic electooxidation process. To this end, a preliminary approach, based on a voltammetric analysis in a solution containing phenol in laboratory cells with Pt electrodes, was carried out. In this preliminary investigation, phenol was used as a …
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Management strategy of landfill leachate and landfill gas condensate
… the UV disinfection in WWTPs. The other one is organic nitrogen, which can pass the nitrification-denitrification process and contribute to the effluent total nitrogen (TN). Also, treatability study was conducted for landfill gas (LFG) condensate. In a laboratory study, leachate samples were …
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Mammalian carnivores as bioindicators to evaluate the exposure and bioaccumulation of organic contaminants in terrestrial ecosystems
… differences are likely due to large variation in contaminant concentrations, possibly reflecting differences in individual raccoon diet and behavior. This is the first study reporting bioaccumulation of halogenated flame retardants in a wild felid in North America, and also the first report of …
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The application of active and passive bioaccumulation methods to measure metallic and organic pollutants along the Namibian coastline
… are responsible for the input of elements and organic pollutants into marine environments. There is currently no ongoing marine pollution monitoring program in Namibia and there are limited studies on marine pollution along the Namibian coastline. Since the 1970s, mussels have been used as …
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Evaluation of the Degradation of Methylene Blue Using Photocatalytic Materials
Non-point organic pollutants in groundwater, stormwater, wastewater, and drinking water are a growing problem in the environment, which lack effective and efficient treatment technologies. Photocatalytic treatment of organic contaminants in aqueous or liquid mediums has gained interest due to their …
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Understanding of pesticides in waters and soils using a novel in situ dynamic sampling technique
… to be independent of pH (4.7-8.2), dissolved organic matter concentration (<20 mg L-1) and ionic strength (0.01-0.25M). Several laboratory and field trials were conducted to confirm the usage of DGT for in situ measurement of pesticides in water and soils. DGT has great potential to be applied …
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The Effect of Select Biological and Environmental Factors on the Horizontal Gene Transfer and Functionality of the TOL Plasmid: A Case Study for Genetic Bioaugmentation
… substrates to stimulate microbial degradation of contaminants (biostimulation) or microbes that have high degradation potentials (bioaugmentation). Although in situ bioremediation processes generally offer more advantages than ex situ methods, there are concerns with the current in situ methods …
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High-throughput analysis of emerging and historical pollutants in biological matrices.
… associated with our ability to analyze contaminants in biological tissue in a timely manner. These deficiencies in laboratory capacity and preparedness demonstrated a critical need to develop and validate high-throughput analytical methods capable of rapid and accurate quantification of …