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 24 for “"Recovery and reuse"”.
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Polyvinyl alcohol size recovery and reuse via vacuum flash evaporation
… Oxygenation Treatment of Water operation, and being non-biodegradable, is a threat to the environment. When all-PVA/wax size is used in weaving, significant incentives exist to recover the synthetic polymer material from the desize wash water stream and reuse it. A new technology that would …
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Synthesis and characterization of chemically treated activated carbons for adsorption of trace contaminants
… has led many governments to establish stricter standards for clean air and water, many of them in the ppb range. This necessitates the development of greatly improved methods for controlling the release of toxic contaminants and on designing new materials tailored to selectively remove a wide …
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Synthesis of DMAP tethered polymer chains for reversible micelle formation
… numerous organic reactions. To increase its recovery and reuse, it has been tethered to dendrimers and to micellar systems, creating nano-scale catalytic pockets for reactions to proceed. Previously developed systems show diminished reactivity over time as the products of the reaction fill up …
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Studies on Hydrogen-Pinch Analysis and Application of COSMO-SAC to Electrolytes
… studies: (1) hydrogen pinch analysis; and (2) application of COSMO-SAC (conductor-like screening model – segment activity coefficient) to electrolytes. Part (1) presents an automated spreadsheet method that can quickly help minimize fresh hydrogen consumption and maximize hydrogen …
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Preparation and applications of catalytic magnetic nanoparticles
… including OP pesticides in groundwater system and chemical nerve agents on the battle field. Homogeneous or micellar decomposition systems with various nucleophiles improve reaction rates significantly without affording the recovery and reuse of the nucleophiles. This research focuses on …
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Resource recovery from sanitation to amplify development: Navigating global and local possibilities
Recovery of human-derived resources (e.g., nutrients, energy) from sanitation systems has emerged as an approach that may generate progress toward multiple Sustainable Development Goals (SDGs). However, persistent uncertainties and concerns (e.g., economics, social appropriateness) across a variety …
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ELECTROCHEMICAL METHODS FOR THE SUSTAINABLE RECOVERY OF GADOLINIUM FROM MRI CONTRAST AGENTS AND FOR THE FABRICATION OF GADOLINIUM-RICH NANOPARTICLES.
… is excreted in complexed forms that are stable and difficult to remove through conventional wastewater treatments, posing both environmental and health-related risks. To address this issue, this work explores two electrochemical strategies aimed at the sustainable recovery and reuse of Gd: a …
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Synthesis and characterisation of silica adsorption platforms for use in environmental remediation
… under mild conditions (room temperature) and shorter reaction times as well as reduced surfactant removal times (15 min) compared to the previously published methods that take approximately 10 h. This material was functionalised with an amine-based functional group to study the feasibility …
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Waste-Based Economic Development in Springfield, Missouri
… resources from the municipal solid waste stream and attracting and developing industries that can reuse them is beneficial to municipal governments. To test this hypothesis, the study focused on the City of Springfield. A waste audit to determine the amount of recyclable present in the waste …
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Development of adsorbent materials for phosphate recovery
… concentrated but needed for the growth of plants and mammals. The latter ones excrete phosphate in urine, with a concentration between 260 and 900 mg/L. Current wastewater treatment plants receive a wide range of stream sources, with a phosphate inlet concentration up to only 20 mg/L. Current …
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Hybrid internal combustion engine : driving a vehicle using air compressed in braking
… oil crisis of the 1970's, stringent government standards placed on automobile manufacturers have led the industry to explore more fuel efficient alternatives to the vehicle with a conventional internal combustion engine/transmission powertrain. This is the motivation behind Mr. David F. Moyer's …
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Digital material skins : for reversible reusable pressure vessels
… sacrificed fully functional hardware and entire vehicles to achieve mission objectives. Propellant tanks are typically jettisoned at different stages in a spacecraft mission and left to burn in the atmosphere after one use, creating a substantial amount of waste and redundancy which …
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Protein containing porous polymers for biocatalytic applications
… enzyme stability towards polar organic solvents and protein agglomeration, which leads to reduced efficiency, making recovery and reuse of the enzyme very difficult. Immobilisation of the enzyme on a suitable support material has been shown to be an effective method in overcoming these problems. …
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New adaptations of analytical tools for the study of dynamic interactions of lanthanide-based catalysis in aqueous media
… However, many conventional Lewis acids, and almost all enantioselective Lewis acid catalysts, must be used under strictly anhydrous conditions to avoid hydrolysis and the difficulties associated with recovery and reuse of the catalysts. Due to these drawbacks of conventional Lewis acids, …
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Innovative Methods for Biomass Sugars Utilization
… biomass to biofuel (such as ethanol and furans) requires both hexose and pentose sugars released to be fully utilized to make this process cost-effective. However, the efficient xylose utilization through either fermentation or chemical conversion is the cost-limiting step. First, the …
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Effects of Powder Reuse on The Mechanical Properties of Electron Beam Additively Manufactured Ti-6Al-4V
… requirements, including chemistry, sphericity and particle size distribution. To maximize process economy, there is interest in reusing powder from inside the build chamber that is heat cycled but is not integrated into the fused metal. This practice can reduce process waste and lower material …
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Advancing Lithium Extraction from Nevada’s Sedimentary Claystones: Hydrometallurgical Pathways and Sustainability Perspectives
… transition toward electrified transportation and renewable energy storage hasestablished lithium as a critical mineral, with demand projected to grow four- to six-fold by 2040. Conventional supply chains: brines and hard-rock spodumene, face mounting technical, environmental, and geopolitical …
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NUTRITIONAL QUALITY AND FOOD SAFETY OF FOOD SOURCES AND FOOD PROCESSING BY-PRODUCTS
In the area of functional foods and dietary supplements, peptides that confer health benefits, also called bioactive peptides, are increasingly recognized as useful tools for improving health and preventing chronic diseases (Udenigwe and Aluko 2012). In fact, food proteins do not only supply …
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Assessing Vulnerabilities to the Spread of Pathogens and Antibiotic Resistance in Agricultural and Water Systems Using Culture-, Molecular-, and Metagenomic-based Techniques
As climate change exacerbates water scarcity and alters available water and fertilizer resources, it is vital that take appropriate measures to ensure sustainable treatment of water, wastewater, and other waste streams that are protective of public health and support recovery and reuse of water and …
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