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 56 for “"membrane performance"”.
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Understanding the Impact of High Aspect Ratio Nanoparticles on Desalination Membrane Performance
… that has been addressed on a large scale by membrane-based separation processes for the last six decades. Commercial membrane technology within one operation, reverse osmosis, has remained consistent since the late 1970s, however within the last two decades, access to nanotechnology has …
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Engineered osmosis technology for desalination of oil and gas exploration wastewaters: assessment of membrane performance and process sustainability
… and minimal field resources. An emerging membrane technology that can treat impaired water for industrial reuse is forward osmosis (FO). In FO, a highly concentrated draw solution imparts an osmotic pressure difference across a semipermeable membrane to extract water from impaired feed …
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Quantitative characterization of physico-chemical properties of the active layers of reverse osmosis and nanofiltration membranes, and their relation to membrane performance
… of reverse osmosis (RO) and nanofiltration (NF) membranes and their interactions with contaminants; (ii) to use such procedures to evaluate the similarities and differences between the active layers of different RO/NF membranes; and (iii) to relate characterization results to membrane …
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Optimal scheduling, design, operation and control of reverse osmosis desalination. Prediction of RO membrane performance under different design and operating conditions, synthesis of RO networks using MINLP optimization framework involving fouling, boron removal, variable seawater temperature and variable fresh water demand.
… theory to describe the permeation through membrane and thin film approach is used to describe the concentration polarization. The model is validated against the operation data reported in the literature. For the sake of clear understanding of the interaction of feed temperature and salinity …
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Effect of Coagulation Pretreatment on Membrane Filtration Performance
… conditions under which coagulation can improve membrane performance has been developed. Improved understanding of this relationship allows microfiltration and ultrafiltration to be applied to a wider variety of water treatment situations. In situations where coagulation can reduce membrane …
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Removal of organic contaminants from groundwater by reverse osmosis
The performance of a poly(ether/urea) membrane has been evaluated in a full scale reverse osmosis system. A series of experiments were conducted with six aromatic compounds - anthracene, pyrene, fluorene, 2-chlorobiphenyl, 2,4,6 trichlorophenol, and pentachlorophenol- and four volatile compounds - …
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Development of in situ synthesis of silver polysulfone membrane for water separation
Water treatment using membrane filtration is one of the common methods that can generate higher amount of quality water in future. However, polymer blending method via ex-situ synthesis method shows some weaknesses on membrane modification such as membrane prone to fouling and hydrophobic. In this …
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Modeling Of Membrane Solute Mass Transfer In Ro/nf Membrane Systems
… of mass transfer models for diffusion controlled membrane applications are published in this dissertation. Article 1 (Chapter 3) describes the impact of membrane surface characteristics and NOM on membrane performance for varying pretreatment and membranes during a field study. Surface charge, …
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Development of Thin-Film Composite Membranes Incorporated With Graphene Oxide and Derivatives for Forward Osmosis Processes
… used to improve the anti-fouling and separation performance of the thin-film composite (TFC) membranes. Nonetheless, very few studies provided an in-depth explanation of the possible interaction between GO and polymer matrix that alter the membrane properties and performance. Thus, the overall …
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Effects of transmembrane hydraulic pressure on the performance of forward osmosis membranes, The
Forward osmosis (FO) is an emerging membrane separation process that continues to be tested and implemented in various industrial water and wastewater treatment applications. Breakthroughs in research and manufacturing have produced better performing membranes with improved structural integrity and …
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Advanced characterization of transport and microstructural properties in membrane materials
Membranes are employed in a variety of sustainable water treatment and energy conversion technologies. Advancing membrane materials for new separations includes unraveling the complex structure-property relationships that govern water and salt transport in conjunction with scaling processing …
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Radiation damage assessment of atomically thin membranes
… results of gas transport across atomically thin membranes, which are relevant to reducing Tritium inventory in fusion reactors by separating Helium from the plasma exhaust stream. A novel experimental apparatus and set-up is devised to measure the gas transport rate across a membrane by …
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The preparation and characterization of hollow fibre membranes for gas separation
… industrially for the preparation of hollow fibre membranes suitable for gas separation applications, has been reproduced on a laboratory scale. Polysulphone hollow fibres were spun from a variety of solvents and their gas transport properties were characterized using equipment built during the …
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Theoretical and experimental investigation of membrane distillation
Invented in the 1960s, membrane distillation is an emerging technology for water treatment attracting more attention since 1980s. There are four configurations of membrane distillations including air gap membrane distillation (AGMD), direct contact membrane distillation (DCMD), sweep gas membrane …
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The effect of very high hydraulic pressure on the permeability and salt rejection of reverse osmosis membranes
… to demonstrate that a seawater reverse osmosis membrane can maintain excellent rejection at pressures as high as 172 bar. However, it was also demonstrated that there was a significant drop in permeability at high pressures - likely due to membrane compaction. A simple visco-elastic model was …
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Fouling in membrane technology for produced water treatment: Assessing mechanisms, mitigation, and CFD Analysis
… sustainability has become a pressing reality. Membrane-based technologies for oily wastewater separation have grown in popularity due to their energy efficiency, chemical/thermal resistance, and low cost. The membrane can separate a wide range of oily wastewater effluents and deliver good …
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Löslichkeitsselektive Mixed Matrix Membranen zur Gaspermeation
In this work solubility selective mixed matrix membranes consisting of silicon polymers and activated carbon are investigated for transport and separation properties of n-butane and methane. For mathematical description of the permeation process a new model is developed based on one-dimensional …
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Catalytic Membrane Reactor for Extraction of Hydrogen from Bioethanol Reforming
… explores a novel application of catalytic membrane reactors for high- purity hydrogen extraction from bioethanol reforming. Conventional membrane systems employ hydrogen permselective materials such as palladium, polymer membranes, which present several material challenges including …
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Advancing hydrophobic desalination membranes using initiated chemical vapor deposition (iCVD) v/
Hydrophobic membranes are the central component of membrane distillation (MD) desalination systems. Optimizing their design is crucial for efficient desalination. There are many requirements on MD membranes. These include high liquid entry pressure (LEP) and high permeability to water vapor. There …
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Ageing under extreme ph conditions, modification and characterization of ultrafiltration and nanofiltration membranes
… of ultrafiltration (UF) and nanofiltration (NF) membranes under long-term exposure to acidic and alkaline cleaning solutions. A theoretical model has been developed for the interpretation of liquid-liquid displacement porosimetry (LLDP) results. In addition, membranes with an improved fouling …
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