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Letteratura scientifica selezionata sul tema "Flocculation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Flocculation"

1

P. Radhakrishnan, Anand N., Marco P. C. Marques, Matthew J. Davies, Brian O'Sullivan, Daniel G. Bracewell e Nicolas Szita. "Flocculation on a chip: a novel screening approach to determine floc growth rates and select flocculating agents". Lab on a Chip 18, n. 4 (2018): 585–94. http://dx.doi.org/10.1039/c7lc00793k.

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2

Kurbiel, J., A. Sapulak e H. Schade. "The Use of a Turbulent Pipe-Flow for Rapid Flocculation of Precipitate in the Electroplating Wastewater Treatment". Water Science and Technology 24, n. 7 (1 ottobre 1991): 255–59. http://dx.doi.org/10.2166/wst.1991.0208.

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The paper presents the results of an experimental pilot study on advanced flocculation of metal hydroxides that are precipitated from electroplating wastewater during pH-adjustment. A pipe-flocculator with a turbulent flow, to ensure proper mixing conditions, was used instead of a classical flocculation tank. The results of the study indicated a high efficiency of the process. The flocculation proceeded within 50-100 seconds, which was much less than is required during classical flocculation. Application of a pipe-flocculator results also in reduction of both capital and operating costs of the wastewater treatment plant. In conclusions, important conditions, which are indispensable if pipe-flocculation is to be used, were formulated.

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3

Dong, Ming, e Qiong Fang Shao. "Study of a Novel Honeycomb Continuous Flocculator". Advanced Materials Research 1033-1034 (ottobre 2014): 435–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.435.

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The continuous flocculator described in this article refers to a kind of continuous flocculation device designed to flocculate fermentation liquid. The honeycomb continuous flocculator is composed of a vessel and built-in trapezoid subassemblies, which divide the space within the vessel into multiple honeycomb channels. The length ratio between the longest diagonal of the regular hexagon and the axial length of the channel is within the range 0.01–0.04; and the internal surface roughness (Ra) of the channels should be 0 < Ra ≤ 0.2 μm. In contrast to current flocculator designs, the channels of the honeycomb continuous flocculator could control the floc grain size, grain fineness distribution in the fermentation liquid and flocculating time and decrease the flow resistance of the flocculating fermentation liquid and increase handling capacity. These capabilities improve solid-liquid separation efficiency for fermentation liquids. The flocculator could be used either for purification of industrial fermentation liquids or sewage treatment.

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4

Lai, Yan Ping, e Jian Hai Zhao. "The Numerical Simulation Study of a Flocculation Reactor". Applied Mechanics and Materials 260-261 (dicembre 2012): 1022–25. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.1022.

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Three-dimensional flow field of flocculating reactor is simulated. Numerical results were applied to analyze and explain influence of flow field under different flocculation conditions. The results indicate that k, ε can reasonably explain flocculation effect, and meanwhile verify the better applicability as the CFD numerical simulation evaluation indexes of flocculation effect. The results can be extended to find an effective way to optimize the design and operation, to improve the efficiency of flocculation.

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5

Westman, Johan O., Valeria Mapelli, Mohammad J. Taherzadeh e Carl Johan Franzén. "Flocculation Causes Inhibitor Tolerance in Saccharomyces cerevisiae for Second-Generation Bioethanol Production". Applied and Environmental Microbiology 80, n. 22 (29 agosto 2014): 6908–18. http://dx.doi.org/10.1128/aem.01906-14.

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ABSTRACTYeast has long been considered the microorganism of choice for second-generation bioethanol production due to its fermentative capacity and ethanol tolerance. However, tolerance toward inhibitors derived from lignocellulosic materials is still an issue. Flocculating yeast strains often perform relatively well in inhibitory media, but inhibitor tolerance has never been clearly linked to the actual flocculation abilityper se. In this study, variants of the flocculation geneFLO1were transformed into the genome of the nonflocculating laboratory yeast strainSaccharomyces cerevisiaeCEN.PK 113-7D. Three mutants with distinct differences in flocculation properties were isolated and characterized. The degree of flocculation and hydrophobicity of the cells were correlated to the length of the gene variant. The effect of different strength of flocculation on the fermentation performance of the strains was studied in defined medium with or without fermentation inhibitors, as well as in media based on dilute acid spruce hydrolysate. Strong flocculation aided against the readily convertible inhibitor furfural but not against less convertible inhibitors such as carboxylic acids. During fermentation of dilute acid spruce hydrolysate, the most strongly flocculating mutant with dense cell flocs showed significantly faster sugar consumption. The modified strain with the weakest flocculation showed a hexose consumption profile similar to the untransformed strain. These findings may explain why flocculation has evolved as a stress response and can find application in fermentation-based biorefinery processes on lignocellulosic raw materials.

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6

Li, Rongpeng, Xuesong Li, Lei Sun, Feifei Chen, Zhenxing Liu, Yuyu Gu, Xiaoyan Gong et al. "Reduction of Ribosome Level Triggers Flocculation of Fission Yeast Cells". Eukaryotic Cell 12, n. 3 (25 gennaio 2013): 450–59. http://dx.doi.org/10.1128/ec.00321-12.

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ABSTRACTDeletion of ribosomal protein L32 genes resulted in a nonsexual flocculation of fission yeast. Nonsexual flocculation also occurred when two other ribosomal protein genes,rpl21-2andrpl9-2, were deleted. However, deletion of two nonribosomal protein genes,mpgandfbp, did not cause flocculation. Overall transcript levels ofrpl32inrpl32-1Δ andrpl32-2Δ cells were reduced by 35.9% and 46.9%, respectively, and overall ribosome levels inrpl32-1Δ andrpl32-2Δ cells dropped 31.1% and 27.8%, respectively, compared to wild-type cells. Interestingly, ribosome protein expression levels and ribosome levels were also reduced greatly in sexually flocculating diploid YHL6381/WT (h+/h−) cells compared to a mixture of YHL6381 (h+) and WT (h−) nonflocculating haploid cells. Transcriptome analysis indicated that the reduction of ribosomal levels in sexual flocculating cells was caused by more-extensive suppression of ribosomal biosynthesis gene expression, while the reduction of ribosomal levels caused by deleting ribosomal protein genes in nonsexual flocculating cells was due to an imbalance between ribosomal proteins. We propose that once the reduction of ribosomal levels is below a certain threshold value, flocculation is triggered.

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7

Liu, Quan Xiao, Wen Cai Xu e Jin Li Li. "Application of Cationic Starch Graft Copolymer in Flocculating of Wastewater from Bleaching". Advanced Materials Research 356-360 (ottobre 2011): 1985–89. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1985.

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Corn starch, acrylamide and diallyl dimethyl ammonium were used as the raw materials and ammonium persulfate as initiator, cationic starch graft copolymer was prepared, and then the prepared cationic starch graft copolymer is applied to flocculate wastewater from bleaching. The results show that The flocculation of cationic starch graft copolymer to wastewater from increases first and then decreases after the reach of the peak with the increase of the cationic degree of the cationic starch graft copolymer, addition amount, flocculating temperature and flocculating time. When the cationic degree of the cationic starch graft copolymer is 27.38%, the addition amount is 7.5%, the flocculating temperature is 50°C and the flocculating time is 30min, the flocculation of cationic starch graft copolymer to wastewater is the best. The flocculation of alum/cationic starch graft copolymer is better than cationic starch graft copolymer is used only. Introduction

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8

Zhou, Li Na, Ling Du e Wen Jie Zhang. "The Effect of KNO₃ on Electrolysis-Assisted Flocculation of Azophloxine Using Polyaluminum Chloride". Applied Mechanics and Materials 707 (dicembre 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amm.707.3.

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Electrolysis-assisted flocculation methods were used in decoloration of azophloxine. Electrolysis-assisted flocculation of azophloxine was conducted under the applied potential using titanium anode. The concentration of KNO3, flocculating time and applied potential were investigated. The application of applied potential has nearly no power to remove the dye from wastewater since the highest decoloration rate is only 2.5% after treatment at KNO3 concentration of 0.6 mol/L. The total flocculating decoloration efficiency decreases gradually after increasing the KNO3 concentration in the solution. When the applied potential is 7 V, the maximum electrolysis-assisted flocculating decoloration rate is 52.3%. When the electrolysis-assisted flocculating time is 5 min, the maximum decoloration rate is 54.2%.

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9

Kurbiel, Jerzy, Adam Sapulak e Horst Schade. "Application of Pipe Flocculator and Cross-Flow Tilted Plate Settler for Effective Separation of Precipitate from Electroplating Wastewater". Water Science and Technology 21, n. 6-7 (1 giugno 1989): 539–46. http://dx.doi.org/10.2166/wst.1989.0256.

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During a research program, the flocculation and settling of suspended solids in electroplating wastewater were tested. The experimental unit comprised a pipe flocculator and a cross-flow tilted plate settler. The experiment showed high efficiency of the system at short flocculation and settling times: τf = 50 s and τc = 11 min., respectively.

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10

Agarwal, Palak, Vikas K. Sangal e Sanjay Mathur. "Improving the performance of the electro-coagulation process through efficient flocculation". IOP Conference Series: Earth and Environmental Science 1326, n. 1 (1 giugno 2024): 012133. http://dx.doi.org/10.1088/1755-1315/1326/1/012133.

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Abstract This study combines the Electro-Coagulation (EC) process with flocculation to improve the COD removal efficiency of the simulated textile wastewater without a significant increase in energy consumption. The process of flocculation improves the settleability of the flocs generated at the time of EC. A 3D aluminum electrode with perforations was used for both EC and flocculation. During flocculation, the rotating speed of the anode and detention time were taken as the major operating parameters. The operating conditions at the time of EC were kept fixed for all the runs. The maximum COD removal efficiency after EC was observed as 85.14% with a Specific Electrical Energy Consumption (SEEC) of 0.023J/mg. However, this removal efficiency increases to 90.43% when EC is followed by flocculation with a total SEEC (EC + flocculation) of 0.029J/mg. The maximum COD removal efficiency of the filtered sample after flocculating it for 20 min at 1 rpm was comparable with the removal efficiency obtained after providing a 30 min settling after flocculation. Therefore, an additional cost of filtration can be saved. This combined process can be considered as an economical and efficient treatment method to match the stringent discharge standards.

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Tesi sul tema "Flocculation"

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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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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Thesis (MSc)--University of Stellenbosch, 2003.
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. sugar content, the presence of inorganic salts, organic solvents, ethanol concentration, pH, agitation etc.) and genetic factors (genes that encode for proteins that are either directly or indirectly involved in flocculation). In top-fermenting yeast strains, several physical and chemical factors that trigger the process have been described, including ethanol concentration, the presence of organic solvents, the absence of molecular oxygen and the presence of inorganic salts (Ca2+ and Mg2+). These factors appear to affect the cell hydrophobicity and the cell surface charge. As for genetic factors, no specific genes have thus far been associated with flocculation in top fermenting yeast strains. In bottom-fermenting yeast strains, the physical and chemical factors that affect the process are similar to the ones described for top-fermenting yeast strains, but include, more specifically, the concentration of hexoses in the media (mannose or glucose), which may inhibit the process. Indeed, flocculation in bottom-fermenting yeast strains has been divided into the NewFlo type (inhibited by both mannose and glucose) and the Fl01 type (inhibited by mannose) on the basis of the inhibitory effect of specific sugars. Various genes have been associated with the flocculation of bottom-fermenting yeast strains. Through genetic analysis, the genes have been categorised into dominant genes, semidominant genes and recessive genes. In order to better understand the role of some of the proteins responsible for flocculation in S. cerevisiae, and to create strains whose flocculation properties would correspond to those wanted in the wine and beer industries, three of the dominant flocculation genes, FL01, FL05 and FL011, were placed under the control of the promoters of the stationary phase-induced genes, ADH2 and HSP30. This was achieved by replacing the native promoters of the flocculation genes with the heterologous promoters through homologous recombination. The laboratory strain FY23, which is nonflocculent due to the absence of the transcription factor that is required for flocculation, F108p,was used as a model system. Some of the transformed strains showed high flocculation, especially when the genes were placed under control of the ADH2 promoter. In addition to this, the strains carrying a modified FL011 gene showed increased adhesion to solid agar media and were able to invade the growth substrate. These strains also showed an increased velum-forming ability when grown in media containing only non-fermentable carbon sources.
AFRIKAANSE OPSOMMING: Flokkulasie kan gedefinieër word as die ongeslagtelike aggregasie van gisselle in 'n vloeibare medium. Hierdie aggregasie van selle, kan ook na verwys word as flok formasie, en in meeste gevalle lei dit tot In vinnige sedimentering. In oppervlak-fermenterende giste, beweeg die flokke na die oppervlakte van die vloeibare medium om sodoende 'n flor -lagie te vorm. Hierdie verskynsel was ook al gevind in ander organismes. Verskeie faktore is verantwoordelik vir die effektiwiteit van flokkuklasie. Hierdie faktore kan in twee groepe verdeel word, nl. fisiese en chemiese faktore (byv. suikerkonsentrasie, die teenwoordigheid van anorganiese soute, organiese oplossings, etanol konsentrasie, pH, ens.) en genetiese faktore (gene wat kodeer vir die proteïene wat of direk of indirek betrokke is by flokkulasie). In oppervlak-fermenterende giste is daar al heelwat informasie beskikbaar omtrent fisies en chemiese faktore se effekte op flokkulasie. Van die faktore waarvan heelwat informasie beskikbaar is sluit in, etanol konsentrasie, die teenwoordigheid van organiese oplossings, die afwesigheid van molekulêre suurstof en die teenwoordigheid van anorganiese soute (Ca2+ en Mg2+). Hierdie faktore toon 'n effek of hidrofobisiteit en elektriese lading op die seloppervlakte. Geen genetiese faktore kon tot dusver gekoppel word aan flokkulasie in oppervlak-fermenterende giste nie. Benede-oppervlak fermenterende giste se fisies en chemiese faktore wat effektiwiteit van flokkulasie beïnvloed is dieselfde as die van oppervlak-fermenterende giste, maar sluit in meer spesifiek, die konsentrasie van heksoses in die media (nl. mannose en glukose), wat 'n inhiberende effek het op flokkulasie. Die benede-oppervlak fermenterende giste se flokkulasie kan in twee segmente verdeel word nl. die NewFlo tipe (word geïnhibeer deur die teenwoordigheid van mannose en glukose) en die Flo1-tipe (word geïnhibeer deur slegs die teenwoordigheid van mannose). Verskeie gene was ook al geidentifiseer wat die effektiwiteit van flokkulasie beïnvloed in benede-oppervlak fermenterende giste. Hierdie gene kan in drie kategorieë opverdeel word, nl dominante-, semi-dominante- en ressessiewe flokkulerende gene. Ten orde 'n beter begrip te kry rondom die proteïene verantwoordelik vir die meeste effektiwiteit ten opsigte van flokkulasie in S. cerevisiae, asook om giste te manipuleer om spesifieke flokkulasie eienskappe te toon volgens die belange van die wyn en bierindustrieë, was drie dominante flokkulerende gene, nl. FL01, FL05, en FL011, onder regulering van stationêre fase-geïnduseerde promotors, PADH2 en PHSP30, geplaas. Dit was verkry deur die vervanging van die wilde tipe promotors van die drie gene met die stationêre fase-geïnduseerde promotors deur middel van homoloë rekombinasie. Die laboratorium gisras, FY23, wat 'n nie-flokkulerende gisras is vanweë die afwesigheid van 'n transkripsionele faktor, Flo8p, wat verantwoordelik is vir die aktivering van belangrike gene in flokkulasie, was gebruik as 'n wilde tipe ras. Sommige van die transformante het In hoë mate van flokkulasie getoon, veral wanneer onder die regulering van die PADH2. Tesame met laasgenoemde verskynsel, was daar gevind dat FL011-transformante 'n verhoging in hul vermoeë het om te bind aan die agar en ook om die agar te penetreer. Laasgenoemde gisrasse het ook die vermoë getoon om 'n flor-lagie te vorm bo-op die oppervlakte van die medium, maar slegs wanneer dit in niefermenteerbare koolstofbronbevattende media opgegroei word.

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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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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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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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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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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, primary productivity and contamination. The prediction of possible changes in flocculation represents an important tool to help in decision making. Although some knowledge has been gained from laboratory and field investigations, the behaviour of the flocs in real conditions is still not well understood. Even though formulations to describe changes in floc dynamics have been proposed, there is a wide disparity between studies. The aim of this research is to contribute to the knowledge of the flocculation process and propose novel methods for the implementation in numerical models, via a case study in the Dee Estuary. The Dee is a hypertidal Estuary located in Liverpool Bay, with surface tidal currents over 1 m/s. The effects of turbulence generated by the strong tidal currents and waves on floc properties are of particular interest. The possibility of a simple formulation for the flocculation process is also investigated in order to be implemented in a state of the art coupling of hydrodynamic (POLCOMS), turbulence (GOTM) and waves (WAM) numerical models. To achieve these objectives, hourly data of grain size, volume concentration and current velocity from a mooring deployed in the Welsh Channel and water samples from a research vessel taken from 12 February to 9 March on 2008 have been used. The high sampling rate for the currentv elocities enables the calculation of turbulent stress, turbulent kinetic energy, shear rate, Kolmogorov microscale and dissipation. Mass concentrations were obtained froma series of water samples collected from a research vessel during the 12-14th February 2008, which were used to convert volume concentration into mass concentration. Three hydrodynamic regimes have been distinguished from the observations: “current only” (negligible effect of waves), “combined currents-waves” (important effects from both forcings) and “wave dominant”. Quarter-diurnal variability of floc size was present during the first two regimes. Observations showed aggregation of flocs during periods of low turbulence with higher magnitude during low water slack than during high water slack. Break-up occurred concurrently with high turbulence periods during flood and ebb phases with higher magnitudes after ebb. Differences are likely due to turbulent stress asymmetries related with mixing and periodic stratification even though freshwater input was low. The “current only” regime was used to investigate the changes in floc settling velocities in relation with turbulent stress. A simple semi-empirical formulation was proposed and implemented in the numerical models. This expression depends on a single variable, which can be obtained from the turbulence model, and is both physically and mathematically correct. Model results qualitatively reproduced the neap-spring variability and the quarter-diurnal variability of floc settling velocities and suspended sediment concentration. During the “combined currents-waves” regime, waves were tidally modulated and led to enhanced aggregation and break-up, with higher floc size range than during the “current only” regime. Wave tidal modulation and quarter-diurnal variability of floc size were lost when waves were dominant. Flocs sizes exhibited a low range related to wave height. Inverse relationships between turbulent properties and median grain size were found for the three regimes, with higher scatter of data for the Kolmogorov microscale and shear rate due to different floc behaviour during flood and ebb phases. Turbulent kinetic energy showed a better relationship with floc size, which suggests its use as a floc size predictor instead of turbulent stresses.

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Libri sul tema "Flocculation"

1

Hansjoachim, Stechemesser, e Dobiáš B, a cura di. Coagulation and flocculation. 2^a ed. Boca Raton: Taylor & Francis, 2005.

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A, Amirtharajah, Clark Mark M, Trussell R. Rhodes e AWWA Research Foundation, a cura di. Mixing in coagulation and flocculation. Denver, CO: The Foundation, 1991.

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3

Kleine, Ulrich. Der Einfluss der Flockenbildungsbeanspruchung auf die Festigkeit und das Sedimentationsverhalten von Flocken bei der Zentrifugalabscheidung. Karlsruhe: Universität Karlsruhe, 1992.

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Blanco, Angeles. Developments in flocculation: A literature review. Leatherhead: Pira International, 2001.

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5

Mines, USDI Bureau of. Improved flocculation method for dewatering coal. S.l: s.n, 1985.

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6

International Symposium on Flocculation in Biotechnology and Separation Systems (1986 San Francisco). Flocculation in biotechnology and separation systems. Amsterdam: Elsevier, 1987.

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Cikcik, Ali. Magnetic flocculation of weakly magnetic minerals. Birmingham: University of Birmingham, 1985.

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8

B, Dobiáš, a cura di. Coagulation and flocculation: Theory and applications. New York: M. Dekker, 1993.

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9

Dippenaar, Andre. Shear flocculation of fines for improved flotation. Randburg, South Africa: Mintek (Mineral and Process Chemistry Division), printed and published by The Council for Mineral Technology, 1985.

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G, Droppo Ian, a cura di. Flocculation in natural and engineered environmental systems. Boca Raton: CRC Press, 2005.

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Capitoli di libri sul tema "Flocculation"

1

Marquez, Dorothy Joyce D. "Flocculation". In Encyclopedia of Estuaries, 327–29. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_214.

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Gooch, Jan W. "Flocculation". In Encyclopedic Dictionary of Polymers, 313–14. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5110.

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Gooch, Jan W. "Flocculation". In Encyclopedic Dictionary of Polymers, 893. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_13769.

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4

Paz, Carlota Garcia, Teresa Taboada Rodríguez, Valerie M. Behan‐Pelletier, Stuart B. Hill, Pablo Vidal‐Torrado, Miguel Cooper, Peter van Straaten et al. "Flocculation". In Encyclopedia of Soil Science, 275–77. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-3995-9_229.

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Gregory, John. "Flocculation Fundamentals". In Encyclopedia of Colloid and Interface Science, 459–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_17.

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Marquez, Dorothy Joyce D. "Estuarine Flocculation". In Encyclopedia of Estuaries, 272–73. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_215.

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Gregory, John. "Flocculation Measurement Techniques". In Encyclopedia of Colloid and Interface Science, 492–523. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_172.

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Shammas, Nazih K. "Coagulation and Flocculation". In Physicochemical Treatment Processes, 103–39. Totowa, NJ: Humana Press, 2005. http://dx.doi.org/10.1385/1-59259-820-x:103.

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9

Verma, Subhash, Varinder S. Kanwar e Siby John. "Coagulation and Flocculation". In Environmental Engineering, 65–81. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003231264-6.

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Haarhoff, Johannes. "Coagulation and Flocculation". In Introduction to Municipal Water Quality Management, 47–59. London: Routledge, 2023. http://dx.doi.org/10.1201/9781003393573-6.

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Atti di convegni sul tema "Flocculation"

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Dmitrović, Selena, Ivana Danilov, Vanja Vlajkov, Tatjana Dujković, Jovana Grahovac, Aleksandar Jokić e Nataša Lukić. "POSSIBILITY OF USING EGG SHELL AS A FLOCCULANT TO HARVEST BIOMASS OF Bacillus sp. FOLLOWING BIOTECHNOLOGICAL TREATMENT OF FOOD SECTOR WASTEWATERS". In 2nd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy, 2024. http://dx.doi.org/10.46793/sbt29.35sd.

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The aim of this study was to asses the ability of egg shell flocculation to recover bacterial Bacillus sp. BioSol021 biomass from the broth after biological treatment of wastewaters from the dairy, wine and fruit juice industries. Different concentrations of flocculant were used to estimate the effect of egg shell dosage on flocculation efficiency and antimicrobial activity against Aspergillus flavus, i.e., inhibition zone diameter. The maximum values for flocculation efficiency and inhibition zone diameter (antimicrobial activity against Aspergillus flavus) for cheese whey effluent were 94.02%, 45 mm, respectively. The maximum values, in the case of winery flotation effluent were 87.77%, 33 mm, and for the fruit juice wastwater 87.25%, 58 mm, respectively. These results indicate that egg shells could be successfully applied as the flocculating agent for separation of Bacillus sp. BioSol021 from the cultivation broth.

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Cheng, Lun K., e Uilke Stelwagen. "Fiber optic flocculation sensor". In Optical Tools for Manufacturing and Advanced Automation, a cura di John W. Berthold III, Richard O. Claus, Michael A. Marcus e Robert S. Rogowski. SPIE, 1994. http://dx.doi.org/10.1117/12.166846.

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Kerekes, R. J., R. M. Soszynski e P. A. Tam Doo. "The Flocculation of Pulp Fibres". In Papermaking Raw Materials, a cura di V. Punton. Fundamental Research Committee (FRC), Manchester, 1985. http://dx.doi.org/10.15376/frc.1985.1.265.

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This paper reviews current knowledge of pulp flocculation over the entire range of consistency found in pulping and papermaking, from dilute suspensions of fibres in water to dry fibres suspended in air. Some of the key factors that govern flocculation in low consistency aqueous suspensions are shown to apply with changing emphasis over the entire consistency range. Several recent findings from our laboratory that fill gaps in current knowledge are also reported.

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Gorres, J., H. W. Kropholler e P. Luner. "Measuring Flocculation Using Image Analysis". In Papermaking Raw Materials, a cura di V. Punton. Fundamental Research Committee (FRC), Manchester, 1985. http://dx.doi.org/10.15376/frc.1985.1.363.

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Experimental and theoretical measures of flocculation were studied using image analysis. An experimental study of commercial board samples led to the proposal of three descriptive floc features, namely, size, ‘definition’, and contrast. Numerical values were obtained from an ensemble averaged linear auto-correlation function. In addition a theoretical model of formation was simulated to compare degrees of flocculation. The theoretical structure was created by using a poisson cluster model in conjunction with a coverage model. This led to the superposition of fibrous micro0-flocs whose flock centre radii, R, and fibre content, N, determine the severity of the formation. The variance and p.t.p correlation of the resulting image textures were computed. These measures were found to have a lower limit which is set by the fibrous structure of the flocs. The findings from the simulation study were then applied in principle to the variance and size information extracted from the board samples to explain their structure. The versatility of programmable image analysis systems was demonstrated for formation measurement.

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Yan, Bipeng, e Feng Shen. "Numerical Modeling and Experimental Study of the Mechanical Flocculation Process". In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-03021.

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Flow characteristics are one of the main factors affecting the flocculation process. The flow field in the flocculation tank was numerically modeled using the κ-ε turbulent flow model by considering different hydraulic conditions such as the flow rate, paddle rotating speed, dimension and its installation positions. The numerical modeling and experiment observation indicates that the turbulent momentum κ and effective energy consumption ε can be used as an indicator of flocculation efficiency. The rectangular shaped flocculation tank can dampen the flow effectively, but in the four corners there is a lack of mixing, which can be solved by installing baffles to promote the flocs growth. A proper paddle rotating speed can increase the collisions between particles in the main flocculation area; while still keep the formatted flocs from being damaged by shear force. Increasing the paddle service range appropriately can enlarge the main flocculation area. The paddle installation height should consider the turbulent conditions in both the upper and lower part of the flocculation tank. A set of parameters was recommended for the mechanical flocculation tank design.

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Hanhui, Zhan, Zhang Xiaoqi, Luo Dingti e Hu Yuehua. "Coagu-Flocculation Mechanism and Experimental Study". In World Water and Environmental Resources Congress 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40737(2004)338.

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Idžakovičová, K., V. Bílek, J. Haidl, M. Isoz e M. Pivokonský. "Flow Simulations Approach for Flocculation Tanks". In Topical Problems of Fluid Mechanics 2024. Institute of Thermomechanics of the Czech Academy of Sciences; CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics, 2024. http://dx.doi.org/10.14311/tpfm.2024.011.

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Flocculation in water treatment facilities plays a key role in the separation of colloidal inorganic and organic substances. Its optimization leads to a significant increase in its efficiency and savings of operational costs. However, it is currently based on trial-and-error experimental approaches. In this contribution, we focus on flow modeling in stirred flocculation tanks that would, after coupling with a calibrated model of particle aggregation, enable simulationbased flocculation optimization. Despite the abundance of literature on stirred tank modeling, there is no universal agreement on the methodology used to describe turbulence nor on the approach to the computational mesh creation. Consequently, there is no unified methodology for simulations and their validation. To address this, we present a best-practice methodology for economical, yet reliable flow simulations in the said device. This methodology includes the choice of the turbulence model, the approach to the design of a high quality mesh suitable for arbitrary geometries, and results evaluation. It is developed based on an extensive literature review, a multitude of flow simulations using several meshes of progressively higher quality and resolution, and various strategies to converge to steady-state flow conditions. The simulation quality indicators used here involve comparison with the experimental data on fluid velocity, stirrer power output, and flow rate through the impeller zone. Additionally, the resulting flow simulation models are compared using tracer transport simulations, hinting at their potential for coupling with particle aggregation models.

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Leinweber, Matthias, Patrick Bitter, Stefan Brueckner, Hans-Ulrich Moesch, Peter Lenz e Bernd Freisleben. "GPU-Based Simulation of Yeast Cell Flocculation". In 2014 22nd Euromicro International Conference on Parallel, Distributed and Network-Based Processing (PDP). IEEE, 2014. http://dx.doi.org/10.1109/pdp.2014.65.

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Wang, Te, Jian Li, Zimin Chang e Linghua Zhang. "Characterization of flocculation by Halomonas sp. B01". In 2016 International Conference on Civil, Structure and Environmental Engineering. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/i3csee-16.2016.53.

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Tianxi Zhang, Keith E. Bowers, Joseph H. Harrison e Shulin Chen. "Phosphorus Reduction in Dairy Effluent through Flocculation". In 2006 Portland, Oregon, July 9-12, 2006. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2006. http://dx.doi.org/10.13031/2013.21184.

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Rapporti di organizzazioni sul tema "Flocculation"

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Thomas, Catherine C., Jonathan Broussard e Victor F. Medina. Chitosan as a Coagulant and Precipitant of Algae Present in Backwater. U.S. Army Engineer Research and Development Center, luglio 2022. http://dx.doi.org/10.21079/11681/44904.

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The purpose of this technical note (TN) is to highlight the current state of knowledge of algal flocculation by chitosan and identify data gaps existing between specific algal characteristics and chitosan binding efficiency. Published relationships and correlations between the quality of backwaters and the prevalence of algae, a baseline for flocculation efficiency of microalgae, and ideal treatment instances for algal removal by way of chitosan flocculation and precipitation will be identified.

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Wilmarth, W. R. Desilication from DWPF Recycle using Ferric Flocculation. Office of Scientific and Technical Information (OSTI), ottobre 2002. http://dx.doi.org/10.2172/803617.

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Xu, Yuming, e H. Hamza. Flocculation of oil sand tailings. pilot-scale tests. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/305296.

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Cender, Clinton, Catherine Thomas, Martin Page, Bradley Sartain, Brianna Fernando, Musa Ibrahim e Alec Wahl. Rapid algae flotation techniques. Engineer Research and Development Center (U.S.), ottobre 2023. http://dx.doi.org/10.21079/11681/47704.

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Dissolved air flotation (DAF) is an effective technique for algae separation following the application of flocculants and coagulants. Some harmful algae produce mucilage or extracellular polymeric substances useful for flotation. This study evaluated natural polysaccharides to determine effects on algal flotation with DAF. Food-grade gums (xanthan gum, guar gum, gum arabic, gellan gum, and diutan gum) were tested with cyanobacteria cultures singly and in combination with commercial flocculants (including Tramfloc 222 and Tramfloc 300). Gum arabic alone had no effect when evaluated at concentrations between 10 mg/L and 5,000 mg/L. However, the combination of gum arabic and Tramfloc 300 yielded higher algal flocculation than Tramfloc 300 alone. The combination of xanthan gum (anionic) and guar gum (cationic) did not perform at the level of the combined xanthan gum and Tramfloc 222 in either flocculation or flotation of algae. Tramfloc 222 and xanthan gum; however, yielded effective flocculation seemingly resistant to changes in interfering factors such as turbulence, pH, and temperature. Furthermore, the combination of xanthan gum and Tramfloc 222 provided the most effective flotation and flocculation independent of pH effects. The results suggest that anionic polysaccharides can be used to increase the efficacy of cationic coagulants such as Tramfloc 222.

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Somasundaran, P. Flotation and flocculation chemistry of coal and oxidized coals. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/6471008.

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Somasundaran, P., e R. Ramesh. Flotation and flocculation chemistry of coal and oxidized coals. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/5632118.

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7

Moudgil, B. M. A new approach in ultrapurification of coal by selective flocculation. Office of Scientific and Technical Information (OSTI), giugno 1990. http://dx.doi.org/10.2172/5925605.

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Moudgil, B. A new approach in ultrapurification of coal by selective flocculation. Office of Scientific and Technical Information (OSTI), dicembre 1989. http://dx.doi.org/10.2172/5143601.

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9

Moudgil, B. M. A new approach in ultrapurification of coal by selective flocculation. Office of Scientific and Technical Information (OSTI), aprile 1992. http://dx.doi.org/10.2172/5164035.

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10

Lalvani, S. Coal flotation and flocculation in the presence of humic acids. Office of Scientific and Technical Information (OSTI), maggio 1990. http://dx.doi.org/10.2172/6991451.

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