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 349 for “"Engineering, Environmental"”.
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Feasibility of sustainable recycling of drill cutting as additive in flexible base
… of oil and gas drilling, presents significant environmental challenges. In Texas, millions of cubic yards of drill cuttings have accumulated, raising concerns over long-term storage and disposal. At the same time, the state consumes approximately 3.7 million cubic yards of flexible base …
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Autonomous 3D Urban and Complex Terrain Geometry Generation and Micro-Climate Modelling Using CFD and Deep Learning
… pragmatic numerical urban micro-climate for wind engineering, environmental, and building energy simulation applications should address the complexity of the geometry and the variability of surface types involved in urban exposures. The original contribution to knowledge in this research is the …
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Deep learning for size-agnostic two-phase flow simulation with realistic pore structures and rock-fluid properties
… across numerous fields, including petroleum engineering, environmental science, chemical engineering, and biomedicine. Recently, deep learning techniques have shown significant potential in enhancing pore-scale flow modelling. However, existing research predominantly addresses single-phase …
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Metagenomic Analysis of Spring and Stream Waters in the Chesapeake and Ohio Canal National Historical Park
… remediation and for assessing the extent of environmental contamination in water resources. Because of the large diversity of contaminants, the systematic and comprehensive analysis of elemental and compound pollutants cannot practically be conducted over an extensive network of water bodies. …
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Development of novel adsorbents for the removal of emerging contaminants from water
Emerging contaminants (ECs) such as estrogen hormones, perfluoro compounds (PFCs), bisphenol-A (BPA), and 1,4-dioxane have been detected in natural water at many places. The existing conventional wastewater treatment systems are not designed for the removal of these contaminants. This critical …
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Treatment of 2,4-dichlorophenol using soybean peroxidase.
In the presence of hydrogen peroxide (H2O2), soybean peroxidase (SBP) extracted from the soybean seed coat catalyzes the polymerization of various chlorinated phenols from wastewater. The resulting polymer precipitates from solution and can be removed through a simple sedimentation or filtration …
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Performance Enhancement of Aerobic Landfill Bioreactors
The operation of aerated waste cells has several advantages over traditional landfills such as, increased rate of waste stabilization and reduced greenhouse gas emissions. However, the operation of aerated waste cells is fraught with uncertainties because it has not been thoroughly studied to …
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Emission Measurement of Air Pollutants from CNG-gasoline Bi-fuel Vehicles
… which is necessary for evaluating the environmental benefits for NGVs. In this thesis, on-board measurements of the emissions from nine bi-fuel vehicles were conducted under different operating conditions on the real road. A comparative study was performed for the EFs of carbon monoxide …
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An Evaluation of Different Risk Ranking Systems for Contaminated Sites
Risk ranking systems for contaminated sites have been developed by different jurisdictions with similar purpose, but it is not clear whether they provide results that are comparable. The United States’ Preliminary Assessment (PA) system, Sweden’s Methods for Inventories of Contaminated Sites (MICS) …
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Assessing Lightning and Wild Fire Hazard by Land Properties and Cloud to Ground Lightning Data with Association Rule Mining over Alberta, Canada
Characteristics of Cloud to Ground (CG) lightning over Alberta, Canada were investigated by using 2010-2016 lightning data with data mining methods. The hotspot analysis was implemented to find the regions with high frequency CG lightning strikes clustered together. Generally, hotspot regions are …
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Estudio de procesos para la solubilización y precipitación de iones metálicos contaminantes mediante bacterias azufre-oxidantes y sulfatoreductoras
In recent years, the heavy metal contamination in the environment, due to the high industrial and mining activities, have produced the development of several technologies with the aim of reducing or removing heavy metals from contaminated media in a simple and economical way, among them the …
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Cobalamin-Enhanced Anaerobic Biotransformation of Carbon Tetrachloride
This study demonstrated that adding catalytic amounts of cobalamins improves biotransformation of high concentrations of CT by increasing the rate and minimizing the accumulation of hazardous products. Relatively low adsorption of CN-Cbl in sand indicated that adding cobalamins to groundwater for …
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Microfiltration of Synthetic Metal Working Fluids Using Aluminum Oxide Membranes
The design of membrane filtration systems is also influenced by the rate of contaminant build-up in the MWF. Microbiological population growth can grow to potentially hazardous levels in extremely short time-scales. Membrane filtration systems designed to control microbial populations must remove …
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Assessment of Gross Accumulation and Leaching Characteristics of Heavy Metals in a Contaminated Urban Soil
The soils of East St. Louis contained many regions of elevated heavy metal concentrations although extreme heterogeneity was evident. In general, the western end of the city contained the most sites with anomalous levels of metals. However, the leaching experiments, although limited in scope, …
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Long-Term Effects of Agricultural Chemicals and Management Practices on Water Quality in a Subsurface Drained Watershed
Double mass curve analysis indicated that the increase of nutrient and herbicide loading began when high amounts of rainfall occurred following chemical application. The primary factor that was found to affect nutrient and herbicide loading was subsurface flow, especially during the growing seasons.
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Hydrothermal Process for Bioenergy Production From Corn Fiber and Swine Manure
With the increasing concerns about the net energy balance of corn ethanol, food prices, and efficiency of the corn milling process, other types of liquid fuels such hydrocarbons from thermochemical conversion of biomass have become potentially promising. This study aims at investigating the …
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Measurement and Modeling of Spatial Distribution of Particulate Matter in Indoor Environments
Fourth, a 2-D mathematical model was developed based on the mass balance of particulate matter. The numerical simulation indicated that the particle spatial distribution was highly related to the airflow pattern, particle source strength and gravitational sedimentation of particles. The numerical …
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Thermochemical Conversion of Swine Manure to Produce Oil and Reduce Waste
The results showed that the thermochemical conversion of swine manure to produce oil is technically feasible. The process could be a promising technology for waste reduction and renewable energy production from organic waste.
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Partitioning and Diffusivity of arsenic(III) in the Active Layer of Thin-Film Composite Reverse Osmosis and Nanofiltration Membranes
The main objective of this study, therefore, was to understand the mechanism controlling the permeation of a neutral molecule (arsenic (III)) through RO/NF membranes. The permeation of potassium iodide (KI), used as background electrolyte, was also investigated. This study introduced Rutherford …
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Deep-Layer Terrestrial Hydrologic Memory and Mechanisms of Its Influence on the Eco-Climatology of the Biosphere
"Next to the ocean, the terrestrial component of the climate system has a memory that controls the predictability of a climate at seasonal to longer time scales. However, the present understanding of the terrestrial memory is limited to the near-surface soil, and the role of deep-soil reservoir is …
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