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Tesi sul tema "Flocculation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Cousland, Bryan. "Flocculation and flocculating mutants of Pseudomonas putida." Thesis, University of Strathclyde, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291993.

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2

Domingo, Jody L. (Jody Lawren). "Stationary phase-specific expression of dominant flocculation genes for controlled flocculation of yeast." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49788.

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Abstract (sommario):

Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Flocculation can be defined as the asexual aggregation of yeast cells in a liquid environment. This aggregation of cells, also referred to as "floc formation", will in most cases lead to rapid settling or sedimentation. However, in so-called top-fermenting yeast strains, the floes can move to the surface of the liquid growth substrate to form a thin layer, called a "velum", that has been compared to other microbial biofilms. The factors that trigger flocculation can be divided into two groups, physical/chemical (e.g. s

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3

Chin, Ching-Ju. "Particle flocculation in stirred tanks." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/21253.

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4

Kazi, Noor Mohammed. "Pneumatic flocculation in water treatment." Thesis, Nottingham Trent University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283273.

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5

Bilgen, Sedat. "Shear flocculation of fine cassiterite." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304300.

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6

Thomas, David N. "Flocculation modelling in wastewater treatment." Thesis, Cranfield University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323835.

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7

Khan, M. M. "Selective flocculation of lead-zinc concentrate." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355440.

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8

Waterson, Joanne. "Selective flocculation by small particle adsorption." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279824.

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9

Jones, David Andrew Ross. "Depletion flocculation of sterically-stabilized particles." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364692.

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10

Ramirez, Mendoza Rafael. "Flocculation controls in a hypertidal estuary." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2010209/.

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Estuaries are ephemeral geological formations in constant change, which is being accelerated by human intervention. Fine sediments are an important characteristic of estuarine systems upon which anthropogenic and natural activities depend. An important feature of fine sediments is their cohesiveness, following which individual particles aggregate into the so-called flocs or break-up due to turbulent motions. Throughout the flocculation process (aggregation and break-up), flocs change their properties of size, density and settling velocity with consequences on suspended sediment transport, prim

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11

Son, Minwoo. "Flocculation and transport of cohesive sediment." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041095.

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12

Jones, Franca. "The mechanism of Bayer residue flocculation." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/844.

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The aim of this study was to determine the mechanism of Bayer residue flocculation. Hematite was chosen as the test substrate as it is a common Bayer residue mineral. Batch settling tests were used to gain an understanding of the aggregation mechanism and to compare the effect of different parameters on flocculation performance. Flocculant adsorption isotherm measurements were related to changes in flocculation performance. Infrared spectroscopy was used to ascertain the configuration of adsorbed flocculant on the hematite surface.Batch settling tests showed that under strong caustic condition

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13

Jones, Franca. "The mechanism of Bayer residue flocculation." Curtin University of Technology, School of Applied Chemistry, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10520.

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The aim of this study was to determine the mechanism of Bayer residue flocculation. Hematite was chosen as the test substrate as it is a common Bayer residue mineral. Batch settling tests were used to gain an understanding of the aggregation mechanism and to compare the effect of different parameters on flocculation performance. Flocculant adsorption isotherm measurements were related to changes in flocculation performance. Infrared spectroscopy was used to ascertain the configuration of adsorbed flocculant on the hematite surface.Batch settling tests showed that under strong caustic condition

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14

Bergström, Roger. "Fibre flocculation during twin-wire roll forming." Licentiate thesis, KTH, Fibre and Polymer Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1606.

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<p>At the division of Paper Technology a forming unitconsisting of headbox, forming roll unit and reservoir systemfor suspension recirculation has been constructed, with themain purpose to experimentally study the paper forming event byvisually following the fibre flow phenomena in the formingzone.</p><p>The effect of various running parameters upon the pressuredistribution, which is in correlation to the flow phenomenaoccuring during forming, has been studied with a flush mountedpressure sensor. Some combinations of running parametersresulted in highly oscillating pressure pulses, which weree

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15

Yan, Huawei. "Fibre suspension flocculation under simulated forming conditions." Doctoral thesis, KTH, Fibre and Polymer Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3794.

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<p>A flow loop system for study of fibre flocculation insuspensions has been developed. The system is designed tosimulate the flow conditions in a paper machine headbox. It isequipped with a radial distributor feeding a step diffuser pipepackage, after which the flow is contracted in a 2-D nozzle.The flow system is also equipped with a secondary flowcontraction with an area reduction ratio of 2:1 after theheadbox nozzle, mimicking accelerations that may take placeduring forming. The flow system is equipped with heating andcooling devices for the study of temperature effects on fibresuspension

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16

Ritcey, Lisa Louella. "Cell wall properties affecting brewing yeast flocculation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0028/MQ31635.pdf.

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17

Anderson, Sandie Lanclyn. "Flocculation of clay suspensions using synthetic polymers." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183126556.

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18

Ashmore, Matthew Howard. "Flocculation studies on model colloids using chitosan." Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324728.

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19

Sidhu, Balwinder Kaur. "Flocculation characterization of metered dose inhaler suspensions." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335852.

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20

Govender, Patrick. "Industrial yeast strains engineered for controlled flocculation." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1450.

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Thesis (PhD (Viticulture and Oenology. Wine Biotechnology))--University of Stellenbosch, 2009.<br>In many industrial fermentation processes, Saccharomyces cerevisiae yeast should ideally meet two partially conflicting demands. During fermentation a high suspended yeast count is of paramount importance to maintain a rapid fermentation rate, whilst efficient flocculation should ideally be initiated only on completion of the primary alcoholic fermentation, so as to enhance product clarification and recovery. Most commercial wine yeast strains are non-flocculent, probably because this trait was co

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21

Hietala, N. (Noora). "Removal of perfluorinated compounds by coagulation-flocculation." Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201607262611.

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Perfluorinated compounds are chemical compounds with carbon-fluorine bond, they are used in commercial products. The goal of this thesis was to find out how coagulation-flocculation method remove perfluorinated compounds from water. Occurrence of perfluorinated compounds in waters and soil were researched and methods of observing these concentrations in the nature. Different concentrations on different points of waste water treatment plants and drinking water treatment plants were also researched. Main focus was to study different coagulation methods. Research methods used in this thesis inclu

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22

Gärde, Jenny. "TREATMENT OF WASTE WATER FROM A FISH CONSERVATION INDUSTRY : Flocculation Experiment and Analysis." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-17183.

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Tjörn is a cluster of islands, located in Västra Götaland’s county, on the west coast of Sweden. A fishing industry called Kädesholmen Seafood AB is located at Kädesholmen, one of the larger islands of Tjörn. The industry produces different types of fish preserves. The resulting waste water is polluted with mostly nutrients and organic matter in high concentrations. In lack of other treatment alternatives, the waste water is collected and transported to Trollhättan for biological degradation. Sweco, a consulting company, has been working together with Klädesholmen Seafood AB to establish a loc

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23

Niu, Haibo. "Flocculation and settling properties of discharged drilling waste /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,159920.

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24

Strand, Sabina P. "Interactions between Chitosans and Bacteria : Flocculation and Adhesion." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-108.

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25

Hartley, William H. "High-Speed Imaging of Polymer Induced Fiber Flocculation." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14627.

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This study presents quantitative results on the effect on individual fiber length during fiber flocculation. Flocculation was induced by a cationic polyacrylamide (cPAM). A high speed camera recorded 25 second video clips. The videos were image-analyzed and the fiber length and the amount of fiber in each sample were measured. Prior to the flocculation process, fibers were fractionated into short and long fibers. Trials were conducted using the unfractionated fiber, short fiber, and long fiber. The short and long fibers were mixed in several trials to study the effect of fiber length. T

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26

Klemedsson, Shicarra. "Flocculation of natural organic matter in Swedish lakes." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85118.

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Flocculation is an important part of the carbon cycle. It is therefore crucial to understand how flocculation is regulated and how different environmental factors impact. A dilemma is that it has been found difficult to measure flocculation experimentally. In this thesis, flocculation of dissolved organic carbon in a Swedish lake was measured in a series of laboratory experiments. The method used was Dynamic Light Scattering (DLS). DLS is used to determine the size distribution profile of, for instance, small particles in suspension. DLS measures Brownian motion and relates it to the particle

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27

Kuczynski, Leszek W. "Evaluation of the flocculation process in granular media." Thesis, University of Ottawa (Canada), 1985. http://hdl.handle.net/10393/4801.

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28

Liem, L. E. "Flocculation mixing by means of vertically oscillating grids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0007/NQ34802.pdf.

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29

Yu, Zhimin. "Flocculation, hydrophobic agglomeration and filtration of ultrafine coal." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/NQ39010.pdf.

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30

Hibberd, David. "Use of ultrasound to characterise polymer induced flocculation." Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267709.

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31

Hughes, Jonathan. "The flocculation of Zymomonas mobilis for ethanol production." Thesis, University of Huddersfield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290989.

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32

Moran, Paul James. "The flocculation and downstream processing of microbial suspensions." Thesis, University of Huddersfield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390633.

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33

Radford, Stewart John. "Depletion flocculation and rheology of sodium caseinate emulsions." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396924.

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34

Gill, R. I. S. "The flocculation of kaolinite suspensions using cationic polyacrylamide." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353463.

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35

Aunins, John Grant. "Induced flocculation of animal cells in suspension culture." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14330.

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36

Bavarian, Farshad. "Coal cleaning by microbial desulfurization and selective flocculation /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487683756127698.

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37

Kajornatiyudh, Sittiporn. "Bacterial extracellular polymers and flocculation of activated sludges." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/52313.

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Abstract (sommario):

The extracellular polymers produced by bacteria play an important role in bacterial aggregation or bacterial flocculation in secondary waste treatment. The mechanisms responsible for this floc formation are thought to be polymer induced adsorption and interparticle bridging among bacterial cells or between bacterial cells and inorganic colloids. The efficiency of the processes following flocculation in the treatment line such as sedimentation, sludge thickening, and sludge dewatering depends on the extent of this bacterial flocculation. In this research, sludge samples from under various sub

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38

Nguyen, Thu Ha. "Flocculation dynamics of cell-associated suspended particulate matter." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23148.

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Abstract (sommario):

Transport of suspended particulate matter (SPM) plays a vital role in controlling large-scale processes related to geophysical flows such as dispersal and sinking of organic matter and contaminants to offshore and deep waters, nutrient cycles, food web stability, morphodynamics and sedimentation in both limnetic and pelagic ecosystems. Although it has been recognized that small-scale microbial processes can introduce substantial differences to the way in which SPM moves in natural waters, the extent to which the attached biological matter affects SPM dynamics is still not well characterized. T

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39

Shen, Xiaoteng. "Modeling flocculation and deflocculation processes of cohesive sediments." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1539616853.

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The transport and fate of cohesive sediments are responsible for many engineering, environmental, economic and policy issues that relate to, for example, siltation and dredging in navigation channels, water quality, water turbidity, pollutant transports, and biological ecosystem responses. Our current understanding, however, is insufficient to conduct accurate quantitative predictions of these processes. This is because the cohesive particles in natural waters will flocculate, which determines the settling, and thus the deposition behaviors. The simulation of flocculation processes is a primar

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40

Okaiyeto, Kunle. "Evaluation of flocculating potentials and charecterization of bioflocculants produced by three bacterial isolates from Algoa Bay, South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/2633.

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Flocculation has been widely adopted as one of the most effective methods to remove colloidal particles in water or wastewater treatment. Synthetic flocculants are conventionally used because of their high flocculating efficiency and cost-effectiveness. However, they have been reported to have hazardous properties and implicated in some serious health problems including senile dementia and neuro-toxicity, as well as being recalcitrant in the environment. Consequently, efforts are being geared away from the use of synthetic flocculants in water and wastewater treatment. Hence, the need for safe

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41

Hecker, Richard. "The characterisation of polyacrylamide flocculants." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/2010.

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Polyacrylamide is widely used as a flocculant but the influence of the molecular mass distribution upon flocculant activity is poorly understood. This thesis outlines the successful characterisation of ultrahigh molecular mass polyacrylamide solutions in terms of discrete solvated polymer coils and coil agglomerates. These features were correlated with the observed flocculation, demonstrating a number of solution state features required to improve flocculation activity.Aqueous solutions of polyacrylamide exhibit time-dependant behaviour affecting viscosity and polymer agglomeration. Improving

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42

Bragg, Amanda Leann. "Phosphorus reduction in dairy effluent through flocculation and precipitation." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1646.

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Abstract (sommario):

Phosphorus (P) is a pollutant in freshwater systems because it promotes eutrophication. The dairies in the North Bosque and its water body segments import more P than they export. Dairies accumulate P-rich effluent in lagoons and use the wastewater for irrigation. As more P is applied as irrigation than is removed by crops, P accumulates in the soil. During intense rainfall events, P enters the river with stormwater runoff and can become bio-available. Reducing the P applied to the land would limit P build up in the soil and reduce the potential for P pollution. Since wastewater P is ass

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43

Landazuri, Natalia. "Effects of flocculation on retrovirus processing, delivery and transduction." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6884.

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The efficiency of retrovirus-mediated gene transfer can be dramatically enhanced by inducing flocculation of viruses. Addition of oppositely charged polymers to virus stocks resulted in the formation of virus-polymer complexes. The complexes specifically incorporated virus particles and only few other proteins, were not cytotoxic, did not reduce the stability of the viruses, and were large enough to sediment, delivering the viruses to the cells more rapidly than by simple diffusion. Increases in the rate of transport of viruses correlated with increases in the rate of transduction, as the poly

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44

Correa, de Araujo Armando. "Starch modification of the flocculation and flotation of apatite." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28657.

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Although the technical literature contains abundant references on applications of starch in mineral processing, the majority is not concerned with phosphate mineral systems. Nevertheless, the interaction between starch and apatite surfaces is relevant to both selective flocculation and flotation of phosphate ores. The main objective of this thesis is to investigate in detail such interaction in order to provide a more clear understanding on the behaviour of apatite/starch systems. Considerable research effort was dedicated to a thorough characterization of the starch samples used, especially

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45

Al-Khalili, Reya Sadik. "Contact flocculation filtration using natural coagulants for developing countries." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30172.

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Contact flocculation filtration using natural cationic polyelectrolytes extracted from seeds of the tree M.oleifera were found to be effective in the treatment of low turbidity waters. The coagulant was dosed immediately prior to the filter inlet, with subsequent flocculation and deposition occurring in the filter bed. This single stage treatment option was considered appropriate for developing countries, due to observed treatment performance, robustness of operation and reduced treatment costs. This work extends and complements previously successful studies on the treatment of medium to high

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46

Zhan, Yihong. "Latices as flocculants in selective flocculation of mineral suspensions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0020/NQ46455.pdf.

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47

Davy, Steven Colin. "On the mechanism of flocculation in NewFlo Saccharomyces species." Thesis, Oxford Brookes University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432711.

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48

Cornelissen, Alex. "The chemistry and technology of water cleaning by flocculation." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387927.

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49

Pallipurath, Radhakrishnan A. N. "Elucidation of flocculation growth kinetics using a microfluidic approach." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1498776/.

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The inter-disciplinary work in this thesis entails the development of a microfluidic device with bespoke imaging methodology to study flocculation growth kinetics dynamically in real-time. Flocculation is an advantageous downstream operation that increases the product-separation efficiency by selectively removing impurities. Yet, there is no unifying model defining the effect of different physico-chemical parameters on the rates of flocculation. Conventional setups for said analyses require large experimental space that are tedious to perform, and are limited by their dependence on end-point a

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50

Dicks, Reay Gary. "Microalgae flocculation and sedimentation by physico-chemical property exploitation." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10366.

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The purpose of this research was to characterise the physical properties of microalgae, as a function of growth and suspension conditions, to enable exploitation of these characteristics for improved separation whilst allowing for water recycle.

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