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 95 for “"Membrane filtration."”.
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Mathematical modeling of membrane filtration
… and investigate new mathematical models for membrane filtration. The work presented is divided into six chapters. In the first chapter the problem is introduced and motivated. In the second chapter, a new mathematical model for flow and fouling in a pleated membrane filter is presented. …
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Cross-flow membrane filtration of cell suspensions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1989.
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Selective fluoride removal by aluminum precipitation & membrane filtration
… Al(OH)3 with subsequent removal of the floc by membrane ultrafiltration. A review of the published literature shows that using aluminum to defluoridate water may rely on aluminum dose, pH, flocculation time and sedimentation time. Aluminum coagulation and membrane filtration technology (Al-CMF) …
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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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Modeling Powdered Activated Carbon Performance in Membrane Filtration Systems
… yields lower adsorbate concentrations in the membrane permeate. Furthermore, application of the activated carbon to continuous-flow reactors installed upstream of the membranes, and the recirculation to a floc blanket reactor after backwash results in significantly lower carbon dose for a …
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Fouling mechanisms in the membrane filtration of single and binary protein solutions
… study the fouling mechanisms of various microfiltration and ultrafiltration membranes were studied when subjected to crossflow filtration using various protein solutions. Experimentation was carried out using controlled flux experiments and fouling phenomena was investigated via the monitoring …
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Competitive Adsorption of Trace Organic Compounds by PAC in Membrane Filtration Systems
A three-component kinetic adsorption model was developed to describe competitive adsorption of a trace organic compound in the presence of NOM. NOM was simplified into two fractions: a strongly competing fraction that directly competes for adsorption sites, and a large, pore blocking fraction that …
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Characterization and preservation techniques of plant xylem as low cost membrane filtration devices
… filtered with a ~ 1 cm² filter area using a transmembrane pressure of 5 psi, an amount sufficient to meet the drinking needs of one person. However, the main drawback of xylem is that its permeability drops by a factor of 100 or more after being left out to dry for only a few hours. This paper …
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Adsorption and membrane filtration for the separation and valorization of hemicellulose from organosolv beechwood hydrolyzates
… from beechwood hydrolyzates by adsorption and membrane filtration were experimentally investigated and techno-economically assessed. At first, an adsorption process was developed to separate residual lignin from hemicellulose out of beechwood hydrolyzate. Four polymeric resins and one zeolite …
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Mechanism study of virus removal in membrane filtration and the application to improve virus removal
… of virus infection without sufficient removal. Membrane bioreactor (MBR) has shown its promise to remove virus in municipal wastewater treatment, but the major concern is the trade-off between the water permeate flux and the virus removal efficiency. The objective of this study is to understand …
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A novel bioadsorption-flocculation fluidized bed bioreactor prior to membrane filtration for wastewater treatment and reuse
… can minimize environmental and health risks. Membrane technology has been developed as one of the reliable treatment methods. However, it has some limitation. Besides the high operation costs, membrane fouling is a major obstacle for the widespread application of this technology. The …
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Evaluation of membrane filtration for treatment of black liquor in small-scale pulp and paper mills in India
… products as raw material to produce brown paper. Membrane ultrafiltration treatment has been advocated by many scholars as a possible alternative treatment method for black liquor, and this study attempts to address industrial concerns on the cost-effectiveness of membranes for black liquor …
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Household ceramic water filter evaluation using three simple low-cost methods : membrane filtration, 3M Petrifilm and hydrogen sulfide bacteria in northern region, Ghana
Drinking water continues to be a major source of waterborne diseases and death in the world because many points of water collection remain unsafe. This thesis reports high level of fecal contamination found in rivers and ponds that are major sources of drinking water supply for the local …
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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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The Antimicrobial Activity of Cold Pressed Terpeneless Valencia Orange Oil at Cold Temperatures
… of temperature abuse, as well as to evaluate membrane filtration as means to remove essential oils from bacteria to prevent further antibacterial action. Cold pressed terpeneless Valencia orange oil was examined in combination with various temperatures (37°C, 10°C, and 4°C) to determine its …
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Screening of Polymeric Membranes and Optimization of Operating Conditions for the Treatment of Produced Water
… and would reduce the impact on the environment. Membrane filtration is a type of physical treatment in which two different phases are separated upon application of an external pressure. Polymeric membranes have significant advantages such as low cost and ease of fabrication, but also major …
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Studies on improved integrated membrane-based chromatographic process for bioseparation
… directly from a fermentation broth, a novel membrane filtration-cum-chromatography device configuration having a relatively impermeable coated zone near the hollow fiber module outlet has been developed. The integrated membrane filtration-cum-chromatography unit packed with chromatographic …
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Novel methods and processes for the chiral resolution of fine chemicals
… novel methodologies andprocesses that integrate membrane filtration, crystallisation, and extraction technologiesfor the chiral resolution of fine chemical racemates.In chapter 3, the effects of pH and temperature on the solubility and phase diagrams ofthree racemic compound-forming systems are …
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Enhanced Column Filtration for Arsenic Removal from Water: Polymer-Templated Iron Oxide Nanoparticles Immobilized on Sand via Layer-by-Layer Deposition
… and is highly toxic. While precipitation and membrane filtration techniques are successfully implemented in developed cities, they are unsuitable for rural and low-resource settings lacking centralized facilities. This thesis presents the use of ultra-small iron oxide (Fe2O3) nanoparticles …
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The Sustainability of Biofuels Produced from Microalgae
… technology emissions, for acoustic harvesting, membrane filtration, flocculation, electrocoagulation and flocculation plus belt filtration, were compared to a modeled dissolved air flotation technology and a fossil fuel source. For a functional unit of one MJ of renewable diesel (RD), membrane …
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