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Teses / dissertações sobre o tema "Filtration"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 25 de julho de 2025

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1

Dorea, Caetano Chang. "Chemically-enhanced gravel pre-filtration for slow sand filtration." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/843007/.

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The simple operational and maintenance requirements of slow sand filtration (SSF), coupled with its high biological treatment efficiency makes it an attractive technology. The main limitation of SSF is its vulnerability to high suspended solids loadings. Pre-treatment in such instances can be achieved by gravel filtration. Cases of gravel pre-filtration underperformance have been attributed to significant fractions of influent suspended particles in the colloidal range. Maximum limits of turbidity for the application of gravel pre-filters have also been suggested. A simple intervention to over
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2

Koch, Michael. "Cake filtration modeling : Analytical cake filtration model and filter medium characterization." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2059.

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<p>Cake filtration is a unit operation to separate solids from fluids in industrial processes. The build up of a filter cake is usually accompanied with a decrease in overall permeability over the filter leading to an increased pressure drop over the filter. For an incompressible filter cake that builds up on a homogeneous filter cloth, a linear pressure drop profile over time is expected for a constant fluid volume flow. However, experiments show curved pressure drop profiles, which are also attributed to inhomogeneities of the filter (filter medium and/or residual filter cake).</p><p>In this
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3

Hwang, Chi-Yung. "Magnetic filtration of water /." [S.l.] : [s.n.], 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7883.

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4

Li, Hongjie. "Optimizing drinking water filtration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0011/MQ60148.pdf.

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5

Mayor, Russell. "Some problems in filtration." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320650.

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6

Watson, Anne Mary. "The filtration of algae." Thesis, University College London (University of London), 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403594.

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7

Hasan, Faisal S. "Upflow sand-roughing filtration." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/34972.

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Slow sand filtration requires low turbidity water for effective operation. In most cases this means pretreating the raw water to reduce its turbidity. Lately horizontal gravel filters have become very popular as a means of pretreatment. They are simple to operate, have a large mass storage capacity, and can cope with high turbidity shock loads. However, cleaning them can be a problem. An alternative pretreatment, which this study is concerned with, is upflow sand roughing filtration. It has the potential advantages of simple design, ease of operation and cleaning, and low area requirements. A
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8

Karisiddappa, Anoop M. "Study of Filtration Characteristics of Crossflow Filtration for Cable Suspended Robot - Algae Harvester." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1470825680.

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9

Yukseler, Hande. "Biological And Chemical Sludge Filtration." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608608/index.pdf.

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Up to date, sludge filterability has been characterized by the Ruth&rsquo<br>s classical filtration theory and quantified by the well-known parameter specific cake resistance (SCR). However, the complexity of the actual phenomenon is clearly underestimated by the classical filtration theory and SCR is often not satisfactory in describing filterability. Although many scientific studies were conducted for a better analysis and understanding of the filtration theory, still a practically applicable solution to replace the classical theory for a better description of filterability has not been prop
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10

Tuori, Timo. "Enhancing filtration by electroacoustic means." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/12211.

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Fouling of filter media and physico-chemical properties of suspensions decrease the efficiency of filtration devices in a wide range of process industries. Environmental protection causes increasing demand to clean effluent waters to higher standards and to recycle process waters more completely. Conventional deliquoring processes are mainly based on a single driving force, usually gravity, underpressure or pressure. Today, multiforce deliquoring processes based on a combination of ultrasonic and/or other nonmechanical forces, like an electric field, are being developed. These new technologica
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11

Sheppard, Stuart Vincent. "Leucocyte filtration and cardiac surgery." Thesis, University of Portsmouth, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310490.

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12

Baril, Catherine. "Filtration réactive à haute température." Mémoire, Université de Sherbrooke, 2002. http://savoirs.usherbrooke.ca/handle/11143/1146.

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Ce projet de maîtrise visait à filtrer des particules à haute température et à dégrader des oxydes d'azote dans une seule unité. Les particules et les oxydes d'azote sont deux des six polluants principaux selon l' Environmental Protection Agency des États-Unis et ils sont tous les deux régis par des réglementations environnementales dans plusieurs pays. La projection de particules par plasma d'air, les procédés d'incinération, de gazéification et de combustion produisent ces deux types de polluants. Il devient alors avantageux des points de vue économique, technique et économie d'espace d'élim
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13

Krupp, Armin Ulrich. "Mathematical modelling of membrane filtration." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:ae6dd9e4-a862-4476-a8d9-35156848297f.

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In this thesis, we consider four different problems in membrane filtration, using a different mathematical approach in each instance. We account for the fluid-driven deformation of a filtercake using nonlinear poroelasticity in Chapter 2. By considering feeds with very high and very low particle concentrations, we introduce a quasi-static caking model that provides a suitable approximation to the full model for the physically realistic concentration regimes. We illustrate the agreements and differences between our model and the existing conventional cake-filtration law. In Chapter 3, we introd
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14

Herterich, James George. "Mathematical models in water filtration." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:73036408-fbc5-497a-a99f-b8da3dbca0a5.

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Membrane filtration is a simple concept for water purification: water containing particulate contaminants is forced through a semi-permeable membrane that rejects the particulates leaving clean water to flow out. Nevertheless, there are many complex features of membrane filtration, the most important of which is the accumulation of the particulates at the membrane surface. This leads ultimately to fouling of the membrane and a reduction in the efficiency of the process. Concentration polarization is the precursor of fouling, that is, a high concentration of contaminants develops in front of th
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15

Leguillon, Virginie. "Filtration des émulsions lipidiques injectables." Paris 5, 1996. http://www.theses.fr/1996PA05P141.

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16

GHIDAGLIA, CLAUDE. "Filtration en profondeur de particules." Paris 6, 1994. http://www.theses.fr/1994PA066371.

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Nous etudions la filtration de particules entrainees par un ecoulement a faible nombre de reynolds dans un empilement desordonne de spheres de verre de meme taille. Nous pouvons visualiser la trajectoire des particules car l'indice de refraction du fluide est ajuste avec celui du verre. L'influence de la structure geometrique du filtre et les effets hydrodynamiques sont etudies plus particulierement. Les mesures portent sur les distributions statistiques des profondeurs de penetration des particules dans le milieu. Des experiences systematiques en fonction de la taille des particules nous ont
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17

Baril, Catherine. "Filtration réactive à haute température." Sherbrooke : Université de Sherbrooke, 2002.

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18

Sanchez, Erin. "Filtration Efficiency of Surgical Masks." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1760.

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Surgical masks are intended to be used to prevent transmission of disease from a health care worker to a patient. Often times, they are relied upon by health care workers for their own protection. In light of recent developments regarding preparation for health care worker response to global infectious diseases such as H1N1 Influenza, health care workers may experience a false sense of security when wearing surgical masks. The goal of this study was to evaluate the filtration efficiency of a double strap tie-on surgical mask. The manufacturer asserts a >95% efficiency with a 0.1 um challenge a
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19

Mullins, Benjamin James, and n/a. "Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration." Griffith University. School of Environmental Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040919.124658.

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This thesis examines the particle capture, fibre wetting and droplet flow processes within wet filters collecting solid and liquid aerosols and within filters collecting only liquid aerosols. The processes involved in this type of filtration were examined through a series of experiments and models developed to describe the behaviour of fibre/liquid systems. This work can be summarized in 4 categories: (1) The bounce and immediate re-entrainment of liquid and solid monodisperse aerosols under a stable filtration regime (pre cake formation) by wet and dry fibrous filters. In this work it was
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20

Fournet, Frédéric. "Étude d'un cycle de filtration - lavage - essorage - centrifuge : Application à la filtration de l'acide salicylique." Vandoeuvre-les-Nancy, INPL, 1988. http://www.theses.fr/1988NAN10134.

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Étude expérimentale et modélisation des paramètres hydrodynamiques influençant un cycle de filtration centrifuge sur essoreuse discontinue. L'acide salicylique est choisi pour sa granulométrie et la forme de ses particules. Les paramètres plus particulièrement étudiés sont : la formation du gâteau, la perméation (ou lavage) et l'essorage (le drainage) et la cinétique de l'essorage. Chacune de ces opérations est étudiée théoriquement en vue d'une modélisation. Trois types d'essais expérimentaux sont réalisés : sous champ gravitant, sous champ centrifuge sur dispositif de laboratoire et essais à
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21

Munholand, Luke. "Filtration à haute température avec des chandelles céramiques = High temperature filtration with ceramic candle filters." Sherbrooke : Université de Sherbrooke, 2001.

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22

Fournet, Frédéric. "Etude d'un cycle de filtration-lavage-essorage-centrifuge application à la filtration de l'acide salicylique /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613693s.

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23

Mullins, Benjamin James. "Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/365591.

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This thesis examines the particle capture, fibre wetting and droplet flow processes within wet filters collecting solid and liquid aerosols and within filters collecting only liquid aerosols. The processes involved in this type of filtration were examined through a series of experiments and models developed to describe the behaviour of fibre/liquid systems. This work can be summarized in 4 categories: (1) The bounce and immediate re-entrainment of liquid and solid monodisperse aerosols under a stable filtration regime (pre cake formation) by wet and dry fibrous filters. In this work it was
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24

Kong, Deyi. "A modelling study of filtration mechanisms for micron-particles filtration in fibrous diesel particulate filters." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130563/9/Deyi%20Kong%20Thesis.pdf.

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Diesel exhaust has a particle size less than 10 µm; for the visualisation of micron-particles’ motion, the numerical method is applied. A coupled lattice Boltzmann method and discrete element method is implemented to investigate the mechanism that governs particle-gas flows and particle fouling in idealised 2D fibrous DPFs. The open-source library, Mechsys, is validated and then implemented for idealised filter configurations. The initial parameters of simulations are filter configurations, initial velocities of fluid, the density of the particles, porosity of the filters, with the particle di
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25

Jeffcoat, Stuart Blakely. "The importance of hydrophobicity/hydrophilicity on particle removal in deep bed filtration and macroscopic filtration modeling." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/20149.

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26

Foreman, Gordon P. "Slow Rate Sand Filtration With and Without Clinoptilolite: A Comparison of Water Quality and Filtration Economics." DigitalCommons@USU, 1985. https://digitalcommons.usu.edu/etd/2896.

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Slow rate sand filtration (SSF) amended with a 20 em surface layer of clinoptilolite, a natural zeolite, was compared to SSF with no amendment in a field scale SSF facility treating 85 m3/d of water. Parameters examined included turbidity, coliforms, and ammonium removal. The control filter with sand and the experimental filter amended with the zeolite were also compared with respect to duration of filter cycle, cold weather operation, and economics. Amended and unamended filters were appr oximately equivalent with respect to ammonium and coliform removal at 10° C. The zeolite amended cell was
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27

Monzón, Montebello Andrea. "Aerobic biotrickling filtration for biogas desulfurization." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/126525.

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Es va gestionar l'operació d'un biofiltre percolador (BTF) durant un període total de 990 dies per a la dessulfuració d'un biogàs sintètic contenint 2,000 ppmv d’H2S (≈ 50 g S-H2S·m-3·h-1), utilitzant un material de rebliment aleatori (anelles Pall d'acer inoxidable). Després de l'optimització de l'operació a pH neutre, es va estudiar l'eliminació simultània de metilmercaptà (CH3SH) i H2S. A continuació es va executar la transició ininterrompuda des de 440 dies a pH neutre (6.0 – 6.5) a 550 dies a pH àcid (2.50 – 2.75). Paral·lelament es van desenvolupar eines per a la monitorització en línia
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28

Bruasse, Laurent. "Stabilité et filtration de Harder-Narasimhan." Phd thesis, Université de Provence - Aix-Marseille I, 2001. http://tel.archives-ouvertes.fr/tel-00004129.

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Née sur les variétés algébriques, la notion de stabilité s'est ensuite généralisée aux variétés kähleriennes, puis, au variétés holomorphes compactes grâce à l'utilisation des métriques de Gauduchon. L'étude du comportement des fibrés (ou des faisceaux) non semi-stables n'a été faite de façon complète que dans le cas algébrique à travers la notion de filtration de Harder-Narasimhan (FHN). Nous poursuivons ici cette étude pour des variétés holomorphes compactes quelconques. Nous montrons qu'il est possible de définir le sous-faisceau de pente maximale d'un fibré vectoriel complexe. Ce sous-fais
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29

Twumasi, Ebenezer. "Molecular filtration : the study of adsorbents." Licentiate thesis, KTH, Byggnadsmaterial, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32075.

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Adsorbent materials for gas purification have been studied and developed for application in many areas. It is known that a single adsorbent may not adequately control multiple contaminants. Therefore, the development of adsorbent materials has accelerated over the past two decades, and is today an area attracting a lot of attention. In view of the global environmental movement for clean air, the development of improved sorbents will help address new challenges that cannot efficiently be met with the generic sorbents that are presently commercially available. On the other hand, the utilization
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30

Ying, Tung-Yu. "Magnetically-seeded filtration of colloidal particles." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/20229.

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31

Kunjikutty, Sobhalatha Panangattu. "Floodplain filtration for treating municipal wastewaters." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100641.

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The effectiveness of a cheap, low-tech, environmentally and technically favorable treatment of secondary treated municipal wastewater by contaminant removal through a floodplain-soil filter was evaluated using floodplain-simulating field lysimeters, packed with a sandy soil in 2002 and sand in 2003 and 2004. Secondary treated wastewaters from Vaudreuil (2002 and 2003) and Pincourt (2004) Wastewater Treatment Plants were used as influent. This was applied at rates of 0.06, 0.19, and 0.31 m3 m-2 d -1 to vegetated lysimeters, and at a rate of 0.19 m3 m-2 d-1 to bare-soil lysimeters.<br>Removal of
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32

Rajapakse, Jayasiri Pemathilake. "Pre-filtration of high turbidity waters." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497127.

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33

Miao, Lin. "The gas filtration properties of needlefelts." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352964.

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34

Payne, Simon Daniel. "Experimental studies of diesel particulate filtration." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610170.

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35

Kakutkina, NA, and MM Mbarawa. "Transition Processes in Filtration Gas Combustion." Plenum Publishing Corporation, 2004. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001750.

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Methane<br>Summary The behavior of gas filtration combustion waves in the low-velocity regime has been studied experimentally with variation in the parameters of the gas flow and porous medium. It is shown that in transition processes there may be quenching or formation of a stable combustion-wave structure that does not correspond to the initial or final conditions. A nontrivial type of transition process accompanied by spatial transfer of the combustion zone is found.
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36

Mignard, Dimitri. "Mass transport studies in membrane filtration." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/12654.

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First, a programme to model concentration polarisation was written using the finite difference approach developed by Ilias and Govind. It was validated with experiments using Centrisystem C-300 and C-400 cartridges and BSA solutions (1-5 g/L), and experimental data from Yeh and Cheng with an H1P30-20 Amicon cartridge and Dextran T-500. The next step was to incorporate fouling into this model. To calculate the configurational Derjaguin-Landau-Vervey-Overbeek (DLVO) forces and the resulting osmotic pressures, large use was made of the work of Bowen <I>et al</I>. Concentration dependent diffusivi
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37

Vengadasalam, Kirijen. "Computational modelling of coalescence filtration process." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/17323/.

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The low water-diesel interfacial tensions arising in biodiesels pose a problem for fuel filters designed to separate water contamination from diesel fuel. Such filters operate by passing the fuel through a fibrous non-woven material with the aim of capturing small water droplets on the fibres and holding them while further droplets coalesce with the captured droplets until the droplets are large enough to be carried away from the fibres and subsequently settle out of the fuel by gravity. The coalescence process is however less effective at lower interfacial tensions. The main purpose of this r
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38

Wu, Nan. "Filtration de nanoparticules par procédés membranaires." Ecole centrale de Marseille, 2013. http://www.theses.fr/2013ECDM0017.

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39

Andan, Saravanan. "Modeling of Drainage in Coalescence Filtration." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1268145371.

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40

Raghavan, Bharath Kumar. "Nanofiber Filter Media for Air Filtration." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279744866.

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41

Farmerie, Sarah Mace. "Stormwater filtration properties of pervious concrete." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025013.

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42

Khan, Muhammad Waleed. "Dynamic filtration at soil-geotextile interfaces." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39882/.

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The soil-geotextile filtration mechanism is a complex process which depends on physical compatibility between the geotextile and the soil to be retained. Geotextiles often perform well under steady state conditions like those found in dams. However, when the soil-geotextile interface is subjected to dynamic loading, the requirements for successful filtering are uncertain and/ or conservative as the controlling factors are not well understood in these circumstances. There are few filter design criteria available for dynamic flow conditions. These criteria do not properly address the internal in
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43

Romo, Romero Ricardo. "Filtration enlargement with applications to finance." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLE012/document.

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Cette thèse se compose de quatre parties indépendantes. Le fil conducteur de celle-ci est le grossissement de filtration. Dans la première partie, nous présentons des résultats classiques de grossissement de filtration en temps discret. Nous étudions quelques exemples dans le cadre du grossissement initial de filtration. Dans le cadre du grossissement progressif nous donnons des conditions pour obtenir la propriété d'immersion des martingales. Nous donnons également diverses caractérisations des pseudo temps d'arrêt et nous énonçons des propriétés pour les temps honnêtes.Dans la deuxième parti
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44

Chateauneuf-Randon, Sixtine de. "Membranes d'hydrogel pour une filtration sélective." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS255.

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Les hydrogels sont des matériaux polymères hydrophiles qui retiennent de grandes quantités d’eau tout en conservant une structure tridimensionnelle, ce qui les rend adaptés à des applications biomédicales et de filtration. Ce manuscrit se concentre sur les membranes d’hydrogels fabriquées à partir de polyéthylène glycol diacrylate (PEGDA) réticulé par UV en présence de chaînes de polyéthylène glycol (PEG) et d’un photoamorceur. Les membranes PEGDA/PEG sont sélectionnées pour leur robustesse mécanique et leur perméabilité élevée qui peut être ajustée en fonction de la concentration et de la mas
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45

Iessa, Hassan. "Concentrating food materials using electrokinetically enhanced filtration (EKEF) : impact on filtration efficiency, quality compounds and power consumption." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3483.

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Countries around the world are suffering from many problems caused by the misuse of their resources either by using non-renewable ones or destroying the valuable features of the resources that are available. Some of the most important challenges facing humanity are related to food and energy security. Food security includes many aspects besides providing people with an adequate amount of safe and healthy food; it also includes improving food processing to produce acceptable, high quality food products with reduced losses of nutrients, carbon footprint and using fewer resources in the productio
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46

Tavares, Marcelo Botini. "Utilização de colunas verticais de filtração em manta e areia como pré-tratamento de filtro lento /." Ilha Solteira : [s.n.], 2008. http://hdl.handle.net/11449/98081.

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Orientador: Edson Pereira Tangerino<br>Banca: Tsunao Matsumoto<br>Banca: Luiz Di Bernardo<br>Resumo: A Filtração Lenta é um processo de tratamento de água que tem como principal característica a eficiente remoção de patógenos, algas e cianobactérias, as quais nos últimos anos têm-se desenvolvido muito nos reservatórios de abastecimento de água devido à eutrofização causada principalmente pelas atividades antrópicas. As cianobactérias produzem substâncias tóxicas conhecidas como cianotoxinas, que causam problemas gástricos, dermatológicos e toxicológicos nos humanos, além de problemas nas estaç
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47

Bucherer, Catherine. "Etude comparative de la déformabilité érythrocytaire par viscométrie et filtration mise au point d'une nouvelle méthode de filtration." Grenoble : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375964714.

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Habibi, Sepideh. "Caractérisation multi-échelles d'un système de filtration en présence d'un biofilm." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2014. http://www.theses.fr/2014ECAP0042/document.

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Dans un procédé de filtration, un fluide traverse une membrane (barrière sélective). Une force motrice s’applique entre les deux côtés de la membrane qui peut être un gradient de pression, température ou un potentiel électrique/chimique. Dans les procédés de filtration par un gradient de pression, certains composés du milieu fluide, traversent la membrane alors que d’autres sont retenues sur la surface membranaire. Ces procédés sont très utiles dans différents domaines de l’industrie, notamment en ce qui concerne le traitement des eaux et des effluents, biotechnologie, agroalimentaire et pharm
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Schmid, Moura Miguel. "Impact of Filtration on Energy Contract Valuation." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/05609615001/$FILE/05609615001.pdf.

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Frisvold, Frede. "Filtration of aluminium : theory, mechanisms, and experiments." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 1990. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2105.

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