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 46 for “"membrane distillation"”.
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Membrane distillation in dairy processing
Membrane distillation (MD) is a novel membrane process for industry which promises to be a low energy and/or low cost alternative to established separation technologies. The overall objective of this research was the theoretical and experimental investigation of direct contact MD (DCMD) for major …
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Membrane distillation for high salinity desalination
Membrane distillation systems typically have low energy efficiency. Multistage membrane distillation (MD) systems can have significantly higher efficiencies than their single stage counterparts. However, multistage MD system design has received limited attention. In this work, the performance of a …
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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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Superhydrophobic membranes for membrane distillation and crystallization
Membrane distillation is a promising alternative to conventional desalination processes, offering lower operating temperature and pressures, high salt rejection and the ability to process high concentration feeds. However, inefficiencies exist in the form of low permeate flux and membrane wetting. …
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Enhanced membrane distillation : analytical and deionization applications
Membrane distillation (MD) is a newer technology that is being investigated for applications such as seawater desalination and concentration of fruit and sucrose solutions. The major advantage of MD over traditional thermal distillation is that it requires a substantially lower thermal energy …
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Development of energy efficient membrane distillation systems
Membrane distillation (MD) has shown potential as a means of desalination and water purification. As a thermally driven membrane technology which runs at relatively low pressure, which can withstand high salinity feed streams, and which is potentially more resistant to fouling, MD could be used for …
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Hollow fiber membrane-based air gap membrane distillation
Membrane Distillation (MD) is a thermally-driven separation process. In this research, desalination of 1 % NaCl solution is achieved by one type of MD namely, Air Gap Membrane Distillation (AGMD). The characteristics of AGMD are evaluated by using a hollow-fiber-set-based compact device. Hot brine …
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Thermodynamic design and fouling of membrane distillation systems
… fill the void. One such developing technology, membrane distillation (MD), has experienced keen academic interest and an increase in start-up businesses in the past decade. MD has expanded into a niche of small scale thermal desalination using solar and waste heat resources, due to its fouling …
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Investigations on Solar Powered Direct Contact Membrane Distillation
… and electricity based desalination. Multi-effect Distillation (MED), Multi-Stage Flashing (MSF), Membrane Distillation (MD) fall under former and Reverse Osmosis (RO), Electro-Dialysis (ED) fall under later. MD offers an attractive solution for seawater as well as brackish water distillation. It …
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The use of isothermal membrane distillation in tomato processing
… paste preparation by the use of isothermal membrane distillation (IMD). Traditional vacuum evaporation processes used for tomato paste production operate at high temperatures for long periods and can cause thermal damage to heat sensitive components and loss of volatile flavour and aroma …
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Instigating buoyancy driven convection to improve membrane distillation performance
Membrane distillation is a thermally driven desalination process that is capable of treating complicated wastewaters with high concentrations of dissolved solids. However, temperature polarization and concentration polarization reduce its distillate production and impede its industrial adoption. …
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Carbon-nanotube-based membranes for water desalination by membrane distillation
… combination with polymers and metals to enhance membrane lifespan and performance. Carbon nanotube Buckypapers were used as a template to engineer composite structures. The new materials have been thoroughly characterized for their thermal, structural and performance characteristics. The …
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Nanophotonics-enabled Solar Membrane Distillation for Off-grid Water Purification
… lower-energy approaches are equally critical. Membrane distillation (MD) has shown potential due to its low operating temperature and pressure requirements, but the requirement of heating the input water makes it energy intensive. Here we demonstrate nanophotonics-enabled solar membrane …
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Pore Wetting in Desalination of Brine Using Membrane Distillation Process
… is one of the state-of-the-art pressure-driven membrane desalination technologies, it is incapable of desalinating high-salinity streams due to the very high osmotic pressure to overcome. Membrane distillation (MD) is one of the emerging methods, which has attracted much attention for …
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Unified framework to design efficient membrane distillation for brine concentration
… technologies for treating high salinity brine. Membrane distillation (MD) is promising for such applications since it is a scalable process that that can be coupled with a low temperature heat source to concentrate water up to saturation. More than five configurations of MD, based on different …
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CFD simulation of polarization phenomena in direct contact membrane distillation systems
Direct contact membrane distillation (DCMD) is a thermal process in which warm feed and cool distilled water flow on opposite sides of a hydrophobic membrane. The temperature difference causes water to evaporate from the feed, travel through the membrane, and condense in the distillate. Because …
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Numerical and experimental investigation of membrane distillation flux and energy efficiency
… technological innovations. This thesis considers membrane distillation (MD), one of the relatively less studied desalination technologies. The energy efficiency of MD in the sweeping gas (SGMD) configuration along with a multi-tray bubble column dehumidifer is analyzed and compared to other …
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Membrane Distillation for Leachate Treatment with Fenton Pre-Coagulation Treatment Process
… treatments is required. In this study, membrane distillation (MD) has been used along with Fenton treatment process for pre-coagulation to achieve an effective removal of contaminants. MD is a technology derived with vapor pressure difference across the hydrophobic membrane which traps …
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Towards efficient applications of membrane distillation: impact of configuration on process performance
L'abstract è presente nell'allegato / the abstract is in the attachment
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Design and fabrication of novel nanofiber membranes via electrospinning technique for membrane distillation
… development of suitable electrospun nanofiber membranes for MD. This study mainly focuses on the newly-developed one-dimensional and two-dimensional nano-materials embedded nanofiber membranes, which suffer less wetting issue and have improved water vapor flux performance in MD. It also …
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