Dissertations / Theses on the topic 'Dewatering'
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Basim, Gul Bahar Jr. "Fine Coal Dewatering." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35680.
Full textMaster of Science
Smyth, Ian Charles. "Cyclonic dewatering of oil." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/411627/.
Full textÅslund, Peter. "On Suction Box Dewatering Mechanisms." Doctoral thesis, KTH, Fiber- och polymerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4780.
Full textQC 20100924
Usher, Shane Patrick. "Suspension dewatering : characterisation and optimisation /." Connect to thesis, 2002. http://eprints.unimelb.edu.au/archive/00000972.
Full textJu, Shuohui. "Electroosmotic dewatering of bentonite suspensions." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59868.
Full textElectroosmosis removed 20-60% of the water with energy expenditures well below the energy required to vaporize the water. Higher voltages or currents removed more water. Removal rates were increased by the addition of CaCl$ sb2$. The lowest bed height (1 cm) gave the lowest energy of dewatering, but the final water removal was low. For constant voltage experiments with an initial field strength of 2.8 V/cm, bed heights around 2 cm gave the highest water removal. The initial solid content had little effect on the final solid content. The Helmholtz/Smoluchowski theory did not predict correctly the effects of electrolyte concentration, solid content and bed height on the rate of electroosmotic dewatering.
Neeson, S. J. N. "New technologies in sludge dewatering." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546397.
Full textBevan, Marc A. "Geoenvironmental impacts of construction dewatering." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431942.
Full textZhang, Yi. "Suspension dewatering with aggregate densification." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/suspension-dewatering-with-aggregate-densification(7599d818-8f26-4e2d-b80f-b4fa243dba52).html.
Full textAstorsdotter, Jennifer. "Dewatering Cellulose Nanofibril Suspensions through Centrifugation." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215079.
Full textCellulosa nanofibriller (CNF) är ett förnybart material med unika styrkeegenskaper. En svårighet med produktion av CNF är att CNF suspensioner innehåller stora mängder vatten. Om volymerna av CNF suspensioner kan minskas med avvattning genom centrifugering, då kan transport- och lagerkostnader sänkas. Målet med det här examensarbetet är att undersöka vilken inverkan olika parametrar har på CNF-avvattning genom centrifugering och identifiera optimala förhållanden för maximalt avlägsnande av vatten. En laboratoriestudie utfördes på fyra olika material. De fyra materialen är 2 w% enzymatiskt behandlad CNF (CNF1), 1.9 w% karboxymetylerad CNF (CNF2) och två kommersiella prover (1.9 w% CNFA och 1.8 w% CNFB). Den huvudsakliga metoden var analytisk centrifugering upp till maximalt 2330 g. De testade parametrarna var initial koncentration innan centrifugering, temperatur, NaCl tillsats, pH, och applicerat fast kompressionstryck (g-kraft och ytvikt). Förutom centrifugeringsexperimenten så karaktäriserades the fyra mmaterialen med laser diffraktion, UV-vis absorption, dynamisk ljusspridning och vägningar av torrhalt. Analys av den experimentella data som insamlats visar att en ökad initial koncentration ger en högre slutkoncnentration, men mindre vatten kan bortföras. Temperaturförändringar har ingen effekt på separation av CNF och vatten. Vid ett applicerat fast kompressibelt tryck på 3 kPa och en initial koncentration 1.5 w% kan koncentrationerna 5.5 w%, 1.5 w%, 4.0 w%, och 4.3 w% nås för CNF1, CNF2, CNFA, och CNFB. Efter extrapolering av polynoma funktioner passad till experimentell data förutspås att koncentrationerna 9.1 w%, 1.5 w%, 6.9 w%, och 7.9 w% kan nås för CNF1, CNF2, CNFA, and CNFB vid 22 kPa och en initial koncentration på 1.5 w%. Förtjockningen av CNF suspensioner som kan, eller förutspås kunna nås genom centrifugering i det här examensarbetet innebär att det är möjligt att avlägsna stora mängder vatten, till exempel kan vatteninnehållet i CNF1 minskas från 65.7 liter/kg CNF till 10.0 liter/kg CNF vid 22 kPa fast kompressionstryck. Koncentrationerna vid 22 kPa fast kompressionstryck är extrapolerade från exprimentell data <3 kPa fast kompressionstryck. Den karboy- metylerade CNF2 kan inte avvattnas om den inte späds ut eller om salt eller pH justeras. Detta är direkt kopplat till de elektrostatiska krafterna i suspensionen och Debye längden. Tillsats av salt eller sänkt pH eliminerar också de koncentrationsgradienter som kan förekomma i utspädda centrifugerade CNF2 suspensioner.
Grant, Christine Sharon. "Electro-osmotic dewatering of mineral ultrafines." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/12117.
Full textRios, Andrea. "DEWATERING OF BIOSOLIDS BY SODIUM FERRATE." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2887.
Full textM.S.Env.E.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering
Mok, Chi Kit. "Design and modelling of electroosmotic dewatering." Thesis, University of Newcastle Upon Tyne, 2006. http://hdl.handle.net/10443/746.
Full textKeles, Serhat. "Fine Coal Dewatering Using Hyperbaric Centrifugation." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37807.
Full textPh. D.
Buckley, Margaret M. "Conditioning for shear in sludge dewatering." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09052009-040620/.
Full textSatyamurthy, Ranjan. "Experimental investigations of geotextile tube dewatering." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full textPaterson, Daniel Thomas. "Understanding rapid dewatering of cellulose fibre suspensions." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58195.
Full textApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Gopalakrishnan, Sridhar. "Electroosmotic and combined field dewatering of sludges." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23367.
Full textFor clay and titanium oxohydrate there was an optimum off-time for a fixed on-time. For $ rm t sb1=30$ s, the most water was removed from clay with $ rm t sb2=0.1$ s while for titanium oxohydrate the most water was removed for $ rm t sb2=3.5$ s. For suspensions (2), (3) and (4), the combination of electroosmotic dewatering with vacuum or expression increased the amount of water removed. In general, interrupted power removed more water than continuous power electroosmosis. For suspensions (3) and (4), only the combined modes were able to achieve dewatering targets set by industry.
Murthy, Sudhir N. "Predicting dewatering equipment performance from laboratory tests." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/43976.
Full textAsmatulu, Ramazan. "Advanced Chemical-Mechanical Dewatering of Fine Particles." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26604.
Full textPh. D.
Eraydin, Mert Kerem. "Scale-up of Using Novel Dewatering Aids." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27990.
Full textPh. D.
Eraydin, Mert Kerem. "Evaluation of Novel Fine Coal Dewatering Aids." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34182.
Full textMaster of Science
Agarwal, Saurabh. "Conditioning and Dewatering Behavior of ATAD Sludges." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31480.
Full textMaster of Science
Liao, Kaixia. "Dewatering of natural sediments using geotextile tubes." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full textMyers, William Scott Elton David J. "Dewatering rock crushing fines using geotextile tubes." Auburn, Ala., 2010. http://hdl.handle.net/10415/2033.
Full textShih-Yun, Liu. "Slurry dewatering in the pipe jacking industry." Thesis, University of Leeds, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619040.
Full textLobosco, Vinicius. "On the Modelling of Mechanical Dewatering in Papermaking." Doctoral thesis, KTH, Fibre and Polymer Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3702.
Full textMost of the water fed into a paper machine is removedmechanically in the forming and press sections. One of thefactor which has an important influence on mechanicaldewatering, i.e. in both forming and pressing, is thestress-strain behaviour of the fibre network.
The focus of this thesis is on the development of improvedmathematical descriptions of the stress-strain behaviourexhibited by fibre networks in the forming and press sections.The first part of the thesis presents a physically based modelof the forming and densification of fibre mats in twin-wireformers. The model can calculate the ecect of the applicationof a varied load through the forming section. It was developedfrom mass and momentum balances of the fibre and liquid phases,the fibre mat stress-porosity relation and an expression forthe permeability as a function of the porosity. The fibre-matstress-porosity relation used is rate-independent and presentshysteresis. Simulations have been conducted to study theeffects of roll pressure, blade pulses, wire tension andbeating. The effect of sequential blade pressure pulses afterthe forming roll on the dewatering and the concentrationgradients could be characterised. The simulations alsoexhibited rewetting by expansion when the fibre mats left theforming roll. Increasing wire tension resulted in increaseddewatering, but the rate of increase diminished rapidly withincreasing tension. The simulation results also indicated thatbeating has a large influence on dewatering.
The second part of the thesis presents two models of therate-dependent stress-strain behaviour of the fibre networkthat is observed in wet pressing. The first model was based onthe approach pioneered by Perzyna (1966) for strain-ratedependent plasticity and was quite satisfactory for calculatingthe stress-strain behaviour of the fibre network in singlepress nips. It was successfully applied for studyingdensification and dewatering in both normal wet pressing andhigh temperature wet pressing. However, the first model onlyincludes rate dependence in the compression phase of thecompressionexpansion cycle; the expansion phase is treated asbeing rate independent
The second model of the stress-strain behaviour of the fibrenetwork treats both compression and expansion as being ratedependent, according to experimental observations. It is basedon the idea that the wet fibre web may be conceived as alayered network of restricted swelling gels. A swollen fibre isa restricted gel, the inner swelling pressure in a swollenfibre wall being balanced by the stresses in the fibre wallstructure. The observed rate dependence of wet webs in bothcompression and expansion phases was attributed to the flow ofwater out of and into the fibre walls. The second model gavepredictions that are in good agreement with results fromuniaxial experiments using pressure pulses of arbitrary shapefor both a single pulse and a sequence of pulses. It maytherefore be used as a general model for the rheologicalbehaviour of the wet fibre network in wet pressing, providedthe model parameters are estimated from experimental data withsmall experimental error.
KEYWORDS:Paper, modelling, dewatering, forming, wetpressing, fibre network stress, rheology, hysteresis,intra-fibre water, compressibility, structural stress,stress-strain, restricted gels, swelling.
Mao, Songqin. "High water content sludge dewatering via freeze-thaw." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21188.pdf.
Full textSilva, Marvin Jose. "Plant dewatering and strengthening of mine waste tailings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0015/NQ46918.pdf.
Full textKrishnamurthy, Shivakumar. "Dual-chemical conditioning for dewatering municipal wastewater sludges." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60230.pdf.
Full textGrant, Christine Sharon. "Surfactant enhanced electro-osmotic dewatering of mineral ultrafines." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/11704.
Full textRabie, Hamid Reza. "Continuous and interrupted electroosmotic dewatering of clay suspensions." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56987.
Full textElectroosmosis removed 20-70% of the water with an energy expenditure well below the heat of vaporization. The water removal rates were increased by the addition of CaCl$ sb2$. Beds of 0.5 cm thick were dewatered faster and with less energy consumption than thicker beds. Interruption with a short circuit applied during a 0.5 s off-time removed about 20-40% more water than DC for equal energy consumption. Interruption at the end of a DC run removed nearly the same amount of water as interruption applied from the beginning of a run. Relative motion between the electrodes in the form of rotation of the upper electrode at 40 or 70 rpm had no significant effect on dewatering. The Helmholtz/Smoluchowski theory did not agree with the experiment results for the effects of interruption in power and electrolyte content.
Ng, Yue-hang, and 伍宇鏗. "Dewatering and treatment of sewage sludge before landfill." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31253222.
Full textMarklund, Stefan. "Dewatering of wastewater sludge by natural air drying." Licentiate thesis, Luleå tekniska universitet, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18524.
Full textReitz, Daniel D. "Municipal sludge dewatering using a belt filter press." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53178.
Full textMaster of Science
Smith, Kara E. "Cleaning and Dewatering Fine Coal using Hydrophobic Displacement." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33416.
Full text
Two primary coal samples were evaluated in the test program, i.e., dry pulverized 80 mesh x 0 clean coal and 100 mesh x 0 flotation feed. These samples were further screened or aged (oxidized) to provide additional test samples. The lowest moisture, 7.5%, was achieved with centrifugation of the pulverized 80 mesh x 0 clean coal sample. Centrifugation provided the most reliable separation method since it consistently produced low moisture, high combustible recoveries, and high ash rejections. Hand shaking produced the next lowest moisture at 16.2%; however, the low moistures were associated with a drop in combustible recovery. There was also a great deal of error in this process due to its arbitrary nature. Factors such as oxidation, size distribution, and contact angle hysteresis influenced the concentrate moistures, regardless of the method utilized.
Master of Science
McInnis, Jeffrey A. "Biodegradation and Dewatering of an Industrial Waste Oil." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/41440.
Full textMaster of Science
Hou, Jing. "ALGEA SUSPENSION DEWATERING WITH AN INCLINED GRAVITY SETTLER." Cleveland State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=csu1328154061.
Full textNg, Yue-hang. "Dewatering and treatment of sewage sludge before landfill /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14723232.
Full textLightfoot, Dennis G. (Dennis George). "Combined fields (electro-osmosis and pressure) dewatering of kelp." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68202.
Full textBy including a dewatering operation in the production of dried kelp meal, much of the soluble salts present in the kelp will be removed with the filtrate. The filtrate would also be valuable as a source of potassium, trace minerals, and phyto-hormones for crops. Energy costs for dewatering are also much lower than for drying. Because kelp is difficult to dewater using conventional methods, a combined fields technique using electro-osmosis and mechanical pressure was investigated.
Electric current and pressure were both found to have a significant positive effect on dewatering. Dewatering resulted in significantly lower ash and available carbohydrate fractions, while having no other significant effect on kelp meal composition. The combined fields dewatering resulted in significant total energy savings over conventional dewatering or drying alone.
The combined fields dewatering process was successfully scaled up to a continuous process using a prototype roller press. The press was able to produce a press cake with up to 32% solids. The continuous process resulted in significantly lower ash content and significantly higher protein. The total energy to produce kelp meal with the roller press was found to be about half of the energy required for drying alone.
PULGAR, NEIRA HUGO ALEJANDRO. "Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt." Thesis, KTH, Skolan för kemivetenskap (CHE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445.
Full textChu, Wan-bun. "Failure analysis for the conveyor chain at dewatering system." access abstract and table of contents access full-text, 2000. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21174131a.pdf.
Full text"Submitted in partial fulfilment of the requirements for the degree of Master of Science in materials technology and management from City University of Hong Kong." Title from title screen (viewed on Aug. 31, 2006) Includes bibliographical references.
Rumpus, Josephine Mary. "Scale down of recovery and dewatering in industrial centrifuges." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287982.
Full textBansal, S. P. "Sludge dewatering in terms of structure and hydraulic conductivity." Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382265.
Full textSmall, Derek Matthew. "A computational and experimental study of the dewatering hydrocylone." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301345.
Full textBurslem, Rosemary Helen. "The pervaporative dewatering of alcohol using caesium polyacrylate membranes." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321842.
Full textMARAZZI, FRANCESCA ALICE. "Growth of microalgal biomass on supernatant from biosolid dewatering." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158195.
Full textThis thesis deals with the feasibility of including a mixed microalgal community in a real wastewater treatment sequence with the double aim of removing nitrogen and producing biomass to feed the anaerobic digesters. In particular, this thesis focuses on identification of relevant waste streams from agricultural and municipal activities (like effluents, centrates, digestates, and a mixture of them) as a substrate for microalgal culture. Chapter 2 contains a critical review, this manuscript summarizes the current approaches to microalgal biomass production using waste streams, including wastewater, waste or CO2-enriched gas (flue gas and biogas), waste organics (i.e., crude glycerol) and waste heat, as well as the primary common operational challenges and corresponding mitigation strategies involved in culturing approaches. The core of experimentation is described in Chapters 3-7 using wastewater from urban or agriculture activity as a substrate for microalgal culture. In particular, Chapter 3 shows the results of experimentation using municipal centrate to produce biomass to feed the anaerobic digesters removing at the same ammonia nitrogen. The novelty of the study consists in the use of raw centrate from urban wastewater treatment plant as a substrate to grow microalgae, while the majority of literature data were obtained on pre-treated (diluted and/or supplemented and/or furtherly clarified) centrate samples, in the use of a continuously fed PhotoBio Reactor (PBR) operated under natural, uncorrected environmental conditions. This work demonstrates that microalgae (Chlorella sp and Scenedesmus sp) are able to easily grow on the centrate. The average specific growth rate in indoor and outdoor batch tests is satisfactory and comparable with literature data, ranging between 0.14-0.16 d-1. During the continuous test the average biomass production is 50 mgTSS L-1 d-1 and the difference between N-NH4 concentration in the influent and in the effluent demonstrates an important removal. Also BMP tests showed good results: the production of biomethane from algal biomass is slower than from sludge, but its final value is slightly higher than that from waste sludge (208 mLCH4 gVS-1 vs. 190 mLCH4 gVS-1). Wastewaters from agricultural activities are the subject of Chapter 4, chemical and physical analyses showed that the liquid fractions of swine manure and the first effluent could be suitable for algal treatment, while the other samples had unacceptable levels of both solid content and turbidity which would seriously limit light penetration. The papers in Chapter 4 and Chapter 5 report the results obtained in lab-scale tests using the agro wastes which had been shown to be more suitable. In Chapter 5 a new approach is proposed using Activated Carbon (AC) from wood as a pre-treatment to facilitate microalgal growth, without addition of tap water for dilution. The optimal optical density values were obtained with 40 g L-1 of AC dosage and 10 minutes adsorption time, corresponding to 88% of turbidity reduction. Then semi-continuous microalgae culturing were tested using adsorbed and not adsorbed liquid centrate (3 replicates). The encouraging lab scale results presented in Chapter 4 and Chapter 5 justify further pilot-scale experimentation, using agrowastes as the nutrient source for microalgae, presented in Chapter 6. The pilot scale (PBR) was installed at a piggery farm in Northern Italy. During the culturing period, microalgal density remained quite constant, around the average value of 0.55 gTSS/L, and the efficiency of Total Nitrogen and of N-NH4+ removal were both very high (on average 80 and 87%, respectively). The search for the best biomass harvesting technique is the main objective of Chapter 7. In this point, microalgal biomass is processed by three solid/liquid separation processes: gravity settling; centrifugation tests, flocculation tests. The main conclusions are reported in Chapter 8.
Kalra, Aashish. "Dewatering of fine coal slurries by selective heating with microwaves." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4536.
Full textTitle from document title page. Document formatted into pages; contains xi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Khan, Konika Moushumi Chemical Sciences & Engineering Faculty of Engineering UNSW. "The effect of floc microstructure and shear on dewatering processes." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40547.
Full textMaawia, Abdalla Ali. "Numerical simulation of irrigation canal priming and dewatering flow conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ38488.pdf.
Full textDursun, Derya. "Gel-like behavior of biosolids in conditioning and dewatering processes." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 260 p, 2007. http://proquest.umi.com/pqdweb?did=1362540141&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full text