Dissertations / Theses on the topic 'Filter media'
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Srinivasan, Priyavardhana. "NANOFIBER INCORPORATED GLASS FIBER FILTER MEDIA." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1124903310.
Full textRaghavan, Bharath Kumar. "Nanofiber Filter Media for Air Filtration." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279744866.
Full textBrika, Bashir. "Investigation of geometric properties of media particles for floating media filter." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5161.
Full textENGLISH ABSTRACT: In a floating medium filter, polymeric beads with a density less than that of water form a floating bed which removes suspended material. Polyolefinic beads (polypropylene and polyethylene) are commonly used as filter media in this application. The geometric properties of the beads, and to a lesser extent the surface properties, strongly influence the performance of the filter. In the case of water treatment, the primary performance requirement is the production of a filtrate with turbidity ≤ 1.0 NTU. The influence of geometric properties on the performance of existing upflow filtration systems has not been extensively researched. The aim of this thesis was therefore to investigate the effects of floating medium granule size and shape on the performance of the floating medium filter (FMF). Towards this goal a pilot plant consisting of a dosing and flocculation unit and a clear PVC column with an inner diameter of 0.3 m and height of 2.8 m was designed and constructed, allowing the effect of media type, bed depth and filtration conditions to be investigated. Artificial feed water for use during the experimental work was made up by dissolving 250 mg/L of bentonite in tap water (≈ 60 NTU). Four median grain sizes (d50 = 2.28, 3.03, 3.30, and 4.07 mm) of polypropylene plastic granules were used. Two media shapes (cubic and disc) were evaluated. The effect of filtration rising velocity, medium depth, and coagulant chemical dosage were investigated using a complete 23 full factorial experimental design. Filter performance was evaluated in terms of filtrate turbidity and headloss development. The direction of filtration was upward in all the experiments. It was found that optimal conditions for turbidity removal were low filtration rate (36.8 L/m2· min), longer media depth (0.6 m) and optimum coagulant dose (23 mg/L). At these conditions the best medium was the one with d50 = 2.28 mm, for which a minimum turbidity of 0.4 NTU was achieved, and which was able to provide 624 L of filtrate of ˂ 1.0 NTU using a bed of 0.014 m3. For this medium headloss was 109 mm H2O at breakthrough, while the other three media showed a headloss of 42 mm H2O at breakthrough. Visual observation indicated that removal of solids took place primarily in the first 0.3 m of the floating bed in the case of the smallest medium, but that solids removal took place over the full depth of the bed for the other three media. It was found that bed depth had the strongest influence on performance for a given medium type. Experimental observation showed that coagulant dosage played an important role in floc size. A higher coagulant dosage (23 mg/L) resulted in a larger floc size which gave better performance. A lower velocity gradient was favourable for the formation of larger flocs. Some effect of media shape was noted, although it appeared that media size was dominant. It is concluded that FMF show promise for application in the water treatment. FMF, however, can be applied successfully as pre-filtration unit for treatment of high turbid water. Proper medium selection in conjunction with operating conditions can enhance performance of the filter. Smaller medium would give better turbidity removal but high headloss development and more frequent backwashing becomes necessary than with larger medium.
AFRIKAANSE OPSOMMING: In ʼn dryfmediumfilter vorm polimeriese korrels met ʼn laer digtheid as dié van water ʼn dryfbedding wat swewende materiaal verwyder. Poli-olefiniese korrels (polipropileen en poliëtileen) word algemeen in hierdie toepassing as filtermedia aangewend. Die geometriese kenmerke, en in ʼn mindere mate die oppervlakkenmerke, van die korrels het ʼn groot invloed op die funksionering van die filter. In geval van waterbehandeling is die hooffunksioneringsvereiste die produksie van ʼn filtraat met ʼn troebelheid van ≤ 1.0 NTU (“nephelometric turbidity units”). Die invloed van die geometriese kenmerke van filtermedia op die funksionering van bestaande stroomop-filtreerstelsels is nog nie omvattend nagevors nie. Die doel van hierdie tesis is dus om ondersoek in te stel na die uitwerking van die korrelgrootte en -vorm van ʼn dryfmedium op die funksionering van die dryfmediumfilter (DMF). Hiervoor is ʼn proefaanleg met ʼn doseer- en uitvlokkingseenheid sowel as ʼn deursigtige pilaar van polivinielchloried (PVC) met ʼn binnedeursnee van 0.3 m en ʼn hoogte van 2.8 m ontwerp en gebou, met behulp waarvan verskillende mediumtipes, beddingdieptes en filtreeromstandighede ondersoek kon word. ʼn Kunsmatige watertoevoer vir die proefneming is vervaardig deur 250 mg/L bentoniet in kraanwater op te los (≈ 60 NTU). Polipropileenplastiekkorrels met vier verskillende deursneë (d50 = 2.28; 3.03; 3.30 en 4.07 mm) is gebruik, en twee mediumvorms (kubus- en skyfvormig) is beoordeel. Die uitwerking van filtrasiestygsnelheid, mediumdiepte en die dosis koaguleermiddel is met behulp van ʼn volledige 23-faktoriaalontwerp ondersoek. Filterfunksionering is aan die hand van filtraattroebelheid en verlies aan drukhoogte beoordeel. Alle proefnemings is teen ʼn opwaartse filtrasierigting uitgevoer. Daar is bevind dat die beste omstandighede vir die verwydering van troebelheid ʼn lae filtrasiekoers (36.8 L/m2 per minuut), ʼn groter mediumdiepte (0.6 m) en ʼn optimale dosis koaguleermiddel (23 mg/L) is. In hierdie omstandighede was die beste medium die een met ʼn d50 van 2.28 mm, waarvoor ʼn minimum troebelheid van 0.4 NTU verkry is, en wat 624 L filtraat van 1.0 NTU met behulp van ʼn bedding van 0.014 m3 kon lewer. By deurbraak het hierdie medium egter ʼn drukhoogteverlies van 109 mm H2O getoon, teenoor die ander drie media se 42 mm H2O op dieselfde punt. Visuele waarneming dui daarop dat, met die kleinste medium, vaste stowwe hoofsaaklik oor die eerste 0.3 m van die dryfbedding verwyder is, teenoor die volle diepte van die bedding vir die ander drie media. Beddingdiepte blyk dus die grootste invloed te hê op funksionering wat enige bepaalde mediumtipe betref. Proefwaarneming toon dat die dosis koaguleermiddel ʼn belangrike rol in vlokgrootte speel. ʼn Hoër dosis koaguleermiddel (23 mg/L) het ʼn groter vlokgrootte en dus beter funksionering tot gevolg. ʼn Laer stygsnelheid blyk ook die beste te wees vir die vorming van groter vlokke. Hoewel mediumvorm oënskynlik ʼn mate van ʼn rol speel, is mediumgrootte eerder die dominante faktor. Volgens die studie blyk DMF belowend vir aanwending in waterbehandeling te wees, veral as voorfiltreereenheid vir die behandeling van baie troebel water. Behoorlike mediumkeuse saam met die regte bedryfsomstandighede kan die funksionering van die filter verder verbeter. Kleiner media sal troebelheid beter verwyder, maar het ʼn groot verlies aan drukhoogte tot gevolg, en sal dus meer gereelde terugspoeling as groter media verg.
Rautenbach, Jeremy Brian. "Improving production yields in bio-pharmaceutical filter media." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111937.
Full textThesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 89-91).
This thesis presents methods to identify sources of variation in rolled goods manufacturing by defining the critical input process parameters, and the application of statistical process control. Sources of variation are prioritized according to a process control hierarchy, and reduced or eliminated through iterative cycles of rapid experimentation. This work emphasizes the value of team work, breaking down the organizational barriers between departments, knowledge sharing and the importance of a scientific approach to problem solving. FilterCo manufactures and assembles filter media catering to the ultrafiltration market growing at ~12% over the next five years. In a high growth scenario, production yield variability presents on-time delivery complications while below target yields drive significant scrap value. As FilterCo seeks to improve product lead time for its customers, while reducing WIP inventory, it must seek to maximize OEE with respect to product yield, equipment performance and availability. The variation identification, reduction and process control methodologies presented in this thesis are demonstrated to advance the goal of reducing production yield variation. The impact of the work has been verified on three filter media grades and have shown ~40% reduction in production yield variation, and rolled throughput yield improvements of ~30%. These improvements on the three membrane grades alone have resulted in an annualized saving equivalent to 60% of the total 2015 scrapped membrane value.
by Jeremy Brian Rautenbach.
S.M.
M.B.A.
Dharmanolla, Sailaja. "A Computer Program for Filter Media Design Optimization." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1184095014.
Full textArouni, Hamidreza. "Nonwoven coalescing fuel-water filter media for diesel engines." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18692/.
Full textHosseini, Seyed Alireza. "MODELING PARTICLE FILTRATION AND CAKING IN FIBROUS FILTER MEDIA." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2530.
Full textAndersen, Erin R. "Thallium Removal from Drinking Water Using Pyrolusite Filter Media." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7399.
Full textMoorthy, Kavitha. "EFFECT OF SURFACE ENERGY OF FIBERS ON COALESCENCE FILTRATION." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185554340.
Full textCescon, Anna. "Assessment of alternative filter media in single and dual media configuration for drinking water treatment." Thesis, Glasgow Caledonian University, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.743902.
Full textCucarella, Cabañas Victor. "Phosphorus recycling from wastewater to agriculture using reactive filter media." Licentiate thesis, KTH, Land and Water Resources Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4449.
Full textThis thesis focused on testing the suitability of reactive filter media used for phosphorus (P) removal from wastewater as fertilizers, thus recycling P to agriculture. The work compared the P sorption capacity of several materials in order to assess their suitability as a source of P for plants. The selected materials (Filtra P, Polonite and wollastonite) were saturated with P and used as soil amendments in a pot experiment. The amendments tended to improve the yield of barley and ryegrass compared with no P addition. The amendments also increased soil pH, P availability and cation exchange capacity in the studied soils. The substrates studied here can be of particular interest for acid soils. Of the materials studied, Polonite appears to be the most suitable substrate for the recycling of P from wastewater to agriculture
Cucarella, Cabañas Victor. "Phosphorus recycling from wastewater to agriculture using reactive filter media /." Stockholm : Mark- och vattenteknik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4449.
Full textKent, Tanya Denise. "The effect of media size on biological aerated filter performance." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287176.
Full textDavies, Phillip D. "Alternative filter media in rapid gravity filtration of potable water." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/12183.
Full textDePalma, Julia E. "The Filter: Social Media and Their Effects on Human Interaction." Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1525694435239416.
Full textVafai, Fereydoon. "Analytical modelling and laboratory studies of particle transport in filter media." Online version, 1996. http://bibpurl.oclc.org/web/23534.
Full textVolooj, Shinenemekh. "Investigation into the wet processing of keratin fibres and filter media." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501954.
Full textHamisi, Rajabu. "Modelling phosphorus dynamics in constructed wetlands upgraded with reactive filter media." Licentiate thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207613.
Full textThis reserch project was finacially supported by Lars Erik Lundberg scholarship foundation for projectnumber (2015/34 and 2016/12), ÅkeochGreta Lissheds Stiftelsen for project number (2015-00026), J.Gust. Richert Stiftelsen and Ecopool researchproject for smart and sustainable environment. QC 20170523
Bowerman, Alexander Scott. "PERFORMANCE OF A STORMWATER FILTER AND BACTERIA INACTIVATION USING BIOCIDAL MEDIA." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/260.
Full textWalter, Sandra L. "Optimizing the efficiency and filter area of the SurgiBox Environmental System by redistributing effective media area across filter length." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127866.
Full textCataloged from the official PDF of thesis.
Includes bibliographical references (page 46).
Across the globe, billions of people lack access to safe surgery. SurgiBox is working to lower that number by creating a portable surgical environment for patients in need. To do this, they are working to improve their air filtration system by better utilizing filter media to create a more efficient system. To help SurgiBox achieve this goal, Solidworks Flow Simulation Models were created and analysed to determine what parameters would be necessary to achieve a goal of a uniform velocity profile while meeting volumetric flow rate specifications. These models show that it is possible to achieve a uniform velocity distribution by using filters with varied resistances to air flow. It was found that, neglecting edge effects, the pressure drops (at a defined velocity) of the filter follow a linear trend across the length of the filter. However, these models also show that edge effects lead to significant air flow inconsistencies revealing that if these edge effects are not addressed, the system may quickly fall out of specification. Numerically generated "ideal" system centerline velocity and pressure curves were created to be used as comparative tools while conducting experiments on the SurgiBox system. These, in combination with the SolidWorks models will inform design changes to the SurgiBox system and help the SurgiBox team quantitativly assess the quality of their designs.
by Sandra L. Walter.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
Yamashita, Hiroshi, Hiroyoshi Yane, Masamichi Nakamura, and Kazuhiro Yamamoto. "Simulation on catalytic reaction in diesel particulate filter." Elsevier, 2010. http://hdl.handle.net/2237/20048.
Full textMofokeng, Teboho. "Full-scale trials of external nitrification on plastic media nitrifying trickling filter." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5024.
Full textIncludes bibliographical references.
In South Africa, many wastewater treatment plants (WWTP) still make us of their rock filled trickling filters. Instead of using them for organics removal and nitrification, there is growing interest in integrating them with biological excess P removal activated sludge (BEPRAS) systems in an external nitrification flow scheme (Hu et al., 2000). In such a scheme, the full influent flow (after primary settling) is discharged to the anaerobic reactor of the BEPRAS system, after which the activated sludge is separated from the water by internal settling tanks. The clarified supernatant is pumped to the trickling filter for nitrification and the activated sludge to the anoxic reactor of the BEPRAS system, where the nitrified water rejoins the main BEPRAS system. This external nitrification BEPRAS system has several advantages over continuing to use the trickling filters for organics removal and nitrification, such as significantly reduced oxygen demand (~50%) and biological N and P removal on the full wastewater flow. To date full-scale studies in South Africa have been performed only with rock media trickling filters, for example that at Daspoort WWTP (Muller et al., 2004, 2006a, b). This report describes an investigation on the full-scale operation of a plastic media nitrifying trickling filter (NTF) at the 1 Ml/d Citrusdal WWTP.
Daido, S., H. Yamashita, S. Oohori, and K. Yamamoto. "Simulation on soot deposition and combustion in diesel particulate filter." Elsevier, 2009. http://hdl.handle.net/2237/20033.
Full textOchi, Fumihiro, and Kazuhiro Yamamoto. "Soot accumulation and combustion in porous media." Maney Publishing, 2006. http://hdl.handle.net/2237/20054.
Full textKulkarni, Prashant S. "Mixed Hydrophilic/Hydrophobic Fiber Media for Liquid-Liquid Coalescence." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1310686055.
Full textO'Connor, Caleb S. "Measurement of Dispersion and Attenuation in Granular Media using a Filter-Correlation Method." Thesis, University of Louisiana at Lafayette, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1592420.
Full textA wideband technique for measuring sound dispersion and frequency-dependent attenuation in granular media is presented. The measurements were done on a mono-disperse medium of 2-cm solid polypropylene balls, over the frequency range of 500 Hz-20 kHz, enough to cover both weak and strong scattering regimes. A horn driver was used to launch sound into a foam-lined bucket containing the granular medium. The latter was mechanically isolated from the driver so as to minimize direct-contact coupling. The foam isolation was not enough, especially at resonances of the bucket-granular system. In the effort to simulate a free-granular medium, the bucket was replaced with a mesh bag hanging in free space. The frequency-dependent wavenumber of the granular is obtained by a filter-correlation method. After successive bandpass filtering, the phase speed and attenuation are obtained within each band, respectively, by signal alignment and amplitude log ratio. The attenuation coefficient yielded reasonable results, illustrating the transition from ``piston-like" dynamics to the strong scattering regime, as the frequency increased. The phase speed results where more sporadic, qualitatively there is a decrease in sound speed as the frequency increases.
Ochieng, GMM, FAO Otieno, TPM Ogada, SM Shitote, and DM Menzwa. "Performance of multistage filtration using different filter media against conventional water treatment systems." Water SA, 2004. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001748.
Full textHungate, Robert W. "Adsorption kinetics for the removal of soluble manganese by oxide- coated filter media." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43861.
Full textActual data from a water treatment plant filter confirmed laboratory experimental results by showing that sorption of soluble manganese does indeed occur on oxidecoated filters. The water treatment plant data also suggested that the sorption kinetics were relatively rapid, again upholding laboratory findings.
Results from the manganese kinetics and sorption
experiments were combined to formulate a theoretical model
which would predict manganese breakthrough in a filter,
given a known set of loading parameters. Preliminary use of
the model indicated that oxide-coated filters could sorb significant quantities of soluble manganese before
detectible levels of manganese appear in the effluent.
Master of Science
Lachendro, Edward J. "Inactivation of surrogate bioaerosols on clean filter media by low-current electric fields." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453568.
Full textTakada, Naoki, and Kazuhiro Yamamoto. "LB simulation on soot combustion in porous media." Elsevier, 2006. http://hdl.handle.net/2237/20044.
Full textBlackford, Marie. "Étude de nouveaux media granulaires et non tissés pour la filtration du vin." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0792.
Full textMembranes and filter aids are classically used filter media throughout the wine making process. During filtration, filter aids form a precoat inducing the retention efficiency of the filter. However, these particles are not regenerable. The aim of this study is to find a cleanable and reusable alternative to existing filter aids, available in various grain-size distributions, in order to perform the different types of wine filtration. The Rilsan® powder, made of biobased polyamide 11, are characterized and studied as an alternative to diatomaceous earth mainly used for enology applications. Results showed that the range of Rilsan® allowed performing both rough and clarifying filtration. The particle size distribution, the granular bed deposition and the filtration efficiency were determined. During filtration using Rilsan® precoat, the fouling mechanisms follow an intermediate pore blocking law. According to their non-porous structure compared to diatomite, these particles are cleanable. Hydrocyclone process is studied in order to achieve this regeneration. Nonwovens have important porosities which is an asset to have high filtration flow rates. New filter media made by electrospinning process of polyamide 11 are tested as an alternative to currently used filtration membranes. The pore diameters measured of 1.5 μm are still too large to be used for wine microbiological stabilization. Their mechanical weakness is a brake to their use in liquid filtration applications. Water permeability is little influenced by the pore size, in the range of media tested, and depends mainly on the thickness of the media and other fabrication processes
MacLure, Ryan Scott. "Performance of a Catch Basin Filter and Leachate from Biocidal Media for Stormwater Treatment." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/47.
Full textTam, Ka-man. "Autotrophic denitrification of synthetic wastewater in biological activated filter (BAF) reactors with sulfur media." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3878922X.
Full textTam, Ka-man, and 譚家雯. "Autotrophic denitrification of synthetic wastewater in biological activated filter (BAF) reactors with sulfur media." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B3878922X.
Full textPark, Soo-Jin. "Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1216931978.
Full textBARTON, JOHN M. H. "EFFECT OF MEDIA GRAIN SHAPE ON PHYSICAL CAPTURE OF PARTICLES IN A FILTER BED." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092931427.
Full textBarton, John M. H. "Effect on media grain shape on physical capture of particles in a filter bed." Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1092931427.
Full textWang, Qiang. "FILTER PERFORMANCE UNDER SIMULATED REAL-WORLD CONDITIONS." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4464.
Full textNakamura, Masamichi, and Kazuhiro Yamamoto. "Simulation on Flow and Heat Transfer in Diesel Particulate Filter." ASME (American Society of Mechanical Engineers), 2011. http://hdl.handle.net/2237/19976.
Full textDavoudi, Masoume. "Aerosol Droplet Migration in Fibrous Media." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509120181801687.
Full textMoberg, Mikhal. "THE EFFECTIVENESS OF SPECIFICALLY DESIGNED FILTER MEDIA TO REDUCE NITRATE AND ORTHOPHOSPHATE IN STORMWATER RUNOFF." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3677.
Full textM.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engr MSEnvE
Lundgren, Lovisas. "Metal Removal Efficiency of Five Filter Media Intended for use in Road Stormwater Treatment Facilities." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292146.
Full textVägar, byggnader, fordon och mänskliga aktiviteter orsakar spridning av föroreningar av vilka en del förekommer i dagvatten. Urban bebyggelse orsakar också hårdgörande av ytor och reducerar jordens permeabilitet vilket skapar snabb avrinning vid nederbörd. Avrinningen innehåller bland annat partiklar, kolväten och andra organiska ämnen, metaller, näringsämnen och mikroorganismer vilka kan ha negativa effekter på yt-, kust- och grundvatten. Omvandlingen till hårdgjorda ytor orsakar därför både ökade volymer avrinning och sämre vattenkvalité. Metaller i dagvatten är ofta bundna till olika partiklar eller förekommer i löst form där den lösta formen anses vara mest miljöfarlig. Infiltration i jord, sand eller annan media är vanliga sätt att reducera avrinning och filtrera metaller. Hög förmåga att avskilja metaller kan ofta hittas för totala koncentrationen av metall men avskiljning av den lösta formen är ofta oklar. Utvärdering av olika filtermaterials förmåga att reducera lösta metaller är därför av särskilt intresse. Kolonnförsöken gjorda för att utvärdera metallavskiljningskapacitet med kommersiellt tillgängliga reaktiva filtermaterial har i denna uppsats visat att filtermaterialen har högst procentuell avskiljning för zink följt av koppar och därefter nickel. Krom och bly avskiljs inte mer i dessa filtermaterial än vad de gör i sandfilter. Två av filtermaterial läckte dessutom initialt höga koncentrationer krom.
Morsch, Patrick [Verfasser], and H. [Akademischer Betreuer] Nirschl. "Detachment of fine-grained thin particle layers from filter media / Patrick Morsch ; Betreuer: H. Nirschl." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/123814795X/34.
Full textMerkle, Peter B. "Characterization and modeling of soluble manganese removal from drinking water by oxide-coated filter media." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162507/.
Full textQin, Hongye. "Investigation of Direct-Reduced Iron as a Filter Media for Phosphorus Removal in Wastewater Applications." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39973.
Full textYamashita, Hiroshi, Shingo Satake, and Kazuhiro Yamamoto. "Microstructure and particle-laden flow in diesel particulate filter." Elsevier, 2009. http://hdl.handle.net/2237/20047.
Full textMISAWA, MASAKI, NAOKI TAKADA, HIROSHI YAMASHITA, SHINGO SATAKE, and KAZUHIRO YAMAMOTO. "LATTICE BOLTZMANN SIMULATION ON FLOW WITH SOOT ACCUMULATION IN DIESEL PARTICULATE FILTER." World Scientific Publishing, 2007. http://hdl.handle.net/2237/20052.
Full textRufianto, Muhammad Haky. "State Prediction for Haptic Remote Teleoperation - A Kalman Filter ApproachState Prognos för haptisk Remote teleoperation – en metod baserad på Kalman-filter." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189155.
Full textTeleoperation systemet är ett viktigt verktyg för att styra en enhet eller modell i ett isolerat område på distans där operatören inte kan utföra uppgiften lokalt. De allra flesta av teleoperation system ger föraren visuell och haptisk kontroll för att utföra uppdraget så naturligt som möjligt. Men på en teleoperation system med stort avstånd, kan tidsfördröjningen medföra en nedgång i prestanda. Denna avhandling syftar till att minimera förseningar problem genom att implementera en förutsägelse tillvägagångssätt med Kalman Filter. Kalman filteralgoritm har i stor utsträckning används för att uppskatta användarens rörlighet för spårning. Kalman filter ger en effektiv mekanism för att förutsäga framtida stat grundad på Bayesian uppskattningen att sekventiellt förutsäga framtida tillstånd och mäta ett verkligt system för att uppdatera systemparametrar. Det primära syftet med detta arbete är att extrahera information som genereras av vår prototypmodell och visualisera data för att återspegla systemets prestanda. Vi använder Phantom Omni enheter och 3D-arm som en modell. Olika typer av Kalman filter algoritmer används för att testa riktigheten och prestandan hos förutsagda tillståndet genereras av filtret. Resultatet visar att genomförandet av Extended Kalman filter (EKF) och utjämningsfunktionen kan övervinna nätverk dröjsmålsvissa grader. Jämförelsen visar att EKF har bättre noggrannhet och prestanda jämfört med Unscented Kalman Filter (UKF) vid bedömningen av framtida tillstånd. Dessutom, genomförandet av utjämningsfunktionen skulle kunna förbättra stabiliteten hos teleoperation systemet.
Heleva-Ponaski, Emily. "Removal Efficiencies, Uptake Mechanisms and Competitive Effects of Copper and Zinc in Various Stormwater Filter Media." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4556.
Full textRobertsson, Filip. "Facebook as News Medium: A Qualitative Study on Reliability in Social Media." Thesis, Malmö högskola, Fakulteten för teknik och samhälle (TS), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20193.
Full textSocial media is becoming a more and more important news medium for young adults. This development has lead media researchers to question whether social media is as capable of educating and informing these young adults as the legacy media did the generations before them. Some argue that social media, with its ability to filter the news feed, might place users in a filter bubble lacking any challenging views. Others argue that social media encourages a diverse news and information feed. What's clear is that the role of the journalist as gatekeeper has diminished, and that anyone is now able to voice their opinions to a big audience. This study investigates how young adults sift through their Facebook feed, how they define reliability in news media, and how they assess their social news feed based on this. The study consists of qualitative interviews and an observational experiment where the respondents scrolled through a fictive Facebook feed. The results show that the assessment made is often very quick and deliberate, and that few news posts live up their definition of reliable, namely objective and transparent. Although Facebook is a common news source, few consider it to be a good and reliable one.