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.
Results
Showing 1 to 18 of 18 for “"Ultrafiltration membranes"”.
-
Designing Magnetically Responsive Ultrafiltration Membranes
<p>Ultrafiltration (UF) membranes developed out of a need for protein separation processes. Currently, they are used in a variety of industries ranging from food manufacturing to pharmaceuticals for two main purposes: concentration, separation, and buffer exchange. UF membrane processes in product …
-
A Study of the Mechanism of Fouling of Ultrafiltration Membranes
Made available in DSpace on 2014-12-13T19:47:45Z (GMT). No. of bitstreams: 1 8009106.pdf: 5690737 bytes, checksum: 450415028d3964cabfb0765d026ad7b3 (MD5) Previous issue date: 1979
-
Polysulfone ultrafiltration membranes impregnated with silver nanoparticles show improved biofouling resistance and virus removal
… energy costs, and decreases the lifetime of membranes. In order to effectively remove viruses, nanofiltration or reverse osmosis (both high energy filtration schemes) must be used. Thus, there is an urgent demand for low pressure membranes with anti-biofouling and anti-viral properties. The …
-
Fouling mechanisms in the membrane filtration of single and binary protein solutions
… 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 of the …
-
Solvent resistant microporous/nanoporous polymeric hollow fiber and flat film membranes and their applications
… out by membrane processes such as nanofiltration/ultrafiltration/microfiltration and membrane solvent extraction. Lack of solvent stability and chemical stability of most commercially available membranes is limiting the utilization of the above mentioned membrane technologies. This dissertation …
-
Controlling ceramic porosity using carboxylate-alumoxane nanoparticles
… fabrication of ultra and nanofiltration ceramic membranes. Infiltration is one mechanism used to deposit strengthening agents, such as ceramic precursors, into porous alumina ceramics. Due to the particle size associated with the alumoxanes, they can be easily infiltrated into 94 nm pore sized …
-
Advances in membrane-based oil/water separation
… Yet, despite their technological predominance, membranes can become severely fouled and irreversibly damaged when bulk and small stabilized oil droplets, emulsions, are present in intake streams. In this thesis, we seek to mitigate these deleterious effects through several means. First we seek …
-
Porous Graded Materials Derived From Block Copolymer Self-Assembly For Water And Energy Applications
… in thickness. It has been utilized to make ultrafiltration membranes for water treatment and selective separation. In the first part, further development on SNIPS polymeric membranes is discussed. In situ grazing incidence small-angle X-ray scattering (GISAXS) was employed to study the …
-
Polymer Dispersity Affects Conformation of Brushes Grafted on Nanoparticles
… as tough thin films,1-3 optics and electrics,4-7 ultrafiltration membranes,8 biomolecular and drug delivery vehicles,9-12 colorimetric sensors,13-15 and lubrication,16-18 partly due to uniform dispersion and/or morphology of polymer brushes with varying chain conformation. Polymer brush …
-
Evaluation of membrane filtration for treatment of black liquor in small-scale pulp and paper mills in India
… 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 concentration …
-
Control of size and charge selectivity in amphiphilic graft copolymer nanofiltration membranes
… of membrane separations make polymer filtration membranes an important resource for the pharmaceutical, food and wastewater treatment industries. Nanofiltration (NF) membranes fill an important niche between nonporous reverse osmosis membranes, which have comprehensive solute rejection and low …
-
Membranbioreaktoren zur industriellen Abwasserreinigung
… water treatment with suspended biomass, where membranes are used to separate the biologically treated water from the biomass. Major benefits of MBR compared to existing technologies are the improved effluent quality and lower footprint. Both characteristics are of special interest in industrial …
-
The Speciation of Dissolved Uranium in Marine Waters
… <p>Surface water samples were filtered through ultrafiltration membranes of varying nominal molecular weights (NMW) and processed using ultrafiltration techniques. The nominal molecular weight (NMW) distribution of Chelex<sup>-238</sup>U, Fe<sup>- 238</sup>U, UV<sup>-238</sup>U , and organic …
-
Role of extracellular polymeric substances and metals in fouling of membranes in the wastewater treatment
… high costs because of cleaning and replacing the membranes. Since no consensus on the exact fouling phenomenon or a single fouling parameter in MBRs has been reached yet the present study was aiming at characterizing membrane foulants in the full-scale MBR Nordkanal (Düsseldorf, Germany), in …
-
Desarrollo de inmovilizados de naringinasa en criogeles de PVA-PEG y en membranas de ultrafiltración para la reducción del amargor en zumo de pomelo
Uno de los principales problemas en la comercialización de los zumos de pomelo es su elevado amargor, debido a la presencia del flavonoide naringina. Esta Tesis Doctoral se centra en el desarrollo de inmovilizados de la enzima naringinasa que sean activos y estables para la eliminación del amargor …
-
Comparison of two ultrafiltration membrane systems for whole milk feta cheese production : a thesis presented in partial fulfilment of the requirements for the degree of Master of Technology in Food Technology at Massey University, Auckland, New Zealand
… involves a membrane filtration method, known as ultrafiltration. The ultrafiltration process utilises pressure as a driving force to concentrate milk by removal of water and small dissolved molecules. Hollow fibre and spiral wound ultrafiltration membranes are the two types of membranes that are …
-
Novel internally-staged ultrafiltration for protein purification
A new ultrafiltration technique based on a multimembrane stack has been developed to fractionate proteins closer in molecular weight than conventionally possible. The technique is illustrated here by obtaining a pure protein product from a binary protein mixture. By employing membranes in series …