Spelling suggestions: "subject:"flocculation"" "subject:"locculation""
61 |
A study of opacity produced by insoluble refractory opacifiersPlanje, Theodore John Marion. January 1940 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1940. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed March 23, 2010) Includes bibliographical references (p. 27).
|
62 |
Modelling of flocculation and settling of suspended sediments using population balances /Neumann, Luis Eduardo. January 2004 (has links) (PDF)
Thesis (Ph.D.) - University of Queensland, 2004. / Includes bibliography.
|
63 |
Isolation and generic identification of the bacteria from activated sludge flocs with studies of the floc formation.Anderson, Robert Edgar, January 1964 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1964. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
|
64 |
Determinação dos gradientes de velocidade médios em sistemas de câmaras em série visando atender ao critério do menor tempo de floculação total / Determination of gradients of average speed camera systems in series to meet the criterion of the lowest total time of flocculationManetta, Lívia Savioli [UNESP] 12 May 2014 (has links) (PDF)
Made available in DSpace on 2015-03-03T11:52:38Z (GMT). No. of bitstreams: 0
Previous issue date: 2014-05-12Bitstream added on 2015-03-03T12:06:20Z : No. of bitstreams: 1
000801492.pdf: 1763859 bytes, checksum: 6119d29067d0782271358dd1d68cf2b9 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Neste trabalho foram definidas as combinações escalonadas de gradientes médios de velocidade de floculação em sistemas de câmaras em série e obtidos seus respectivos tempos de floculação total visando atender ao critério do menor tempo de floculação total: nesse sentido foram empregados metologias apresentadas por Argman e Kaufman (1970), Bratby (1981) e Pádua (1994), as quais apresentam modelo de cinética de floculação, metodologia para obtenção dos coeficientes matemáticos por meio de ensaios em escala de laboratório e método para estimativa dos gradientes médios de velocidade de floculação em unidades com escoamento contínuo a partir de ensaios em reatores estáticos. Além disso, foi analisada a sensibilidade do modelo matemático e realizada a aplicação do conjunto obtido pela metodologia concebida por Pádua. Foram obtidos de 15 a 495 combinações de gradiente médio de velocidade de floculação a depender do número de câmaras em série (variando de 2 a 8) resultando em 1.281 combinações distintas, posteriormente foi aplicado a estas combinações 9 diferentes eficiências, resultando em 11.529 valores de floculação total: finalmente aplicou-se uma variação na velocidade de sedimentação (0,5; 2,5 e 5 cm/min) correspondente e diferentes relações entre os coeficientes cinéticos, resultando em 34.587 valores de tempo de floculação total. Foram analisados os percentis desse universo em 5 e 10% para os menores tempos de floculação total, resultando em 1.602 e 3.104 valores respectivamente, com valor mínimo de 2,4 minutos e máximo de 20,1 e 23,8 minutos para percentis de 5 e 10%. Observou-se que o modelo é sensível às variações da razão dos coeficientes cinéticos, quanto maior o valor desta relação menores serão os valores de tempo de floculação. O conjunto de resultados pode ser aplicado à metodologia concebida para obtenção de valores ótimos de tempo de floculação total... / In this paper the scaled average velocity gradients flocculation in camera systems in series and obtained respective times total flocculation combinations were set to meet the criterion of shorter total flocculation were accrodingly employed methodologies presented by Argman and Kaufman (1970), Bratby (1981) and Padua (1994), which have kinetic flocculation method for obtaining the mathematical model coefficients by tests on laboratory scale and method for the estimation of average velocity gradients flocculation units with flow continuous from tests in static reactors. Furthermore, we analyzed the sensibility of the mathematical model and realized the application of the methodology devised jointly obtained by Padua. Were obtained from 15-495 combinations average velocity gradient flocculation depending on the serial number of cameras (varying from 2 to 8), resulting in 1281 different combinations subsequently was applied to nine different combinations of these efficiencies, resulting in 11529 values total time of flocculations, and finally applied to a change in sedimentation rate (0,5, 2.5 and 5 cm/min) corresponding to different relationships between the kinetic coefficients, resulting in 34587 values for total time of flocculation. We analyzed the percentiles of this universe in 5 and 10% for the lowest times total flocculation, resulting in 1602 and 3104 values, respectively, with minimum maximum of 20.1 and 23.8 minutes value of 2.4 minutes and for percentiles of 5 and 10%. It was observed that the model is sensitive to variations of the ratio of the kinetic coefficients, the larger value of this ratio will be smalller time values flocculation. The result set can be applied to the methodology designed to obtain optimal values of total flocculation time, cheking different situations from those observed when the isolated application of the methodology, experiencing a reduction in total time of flocculation in the comparative methods
|
65 |
Studies on bioflocculant production by a consortium of two bacterial species belonging to the Methylobacterium and Actinobacterium generaNtsaluba, Luvuyo January 2012 (has links)
Bioflocculants produced by two identified bacteria: Actinobacterium sp. Mayor and Methylobacterium sp. Obi were investigated with regard to their physicochemical and flocculating characteristics. The two strains were later combined to form a consortium for further studies. The optimum culture conditions for the bioflocculant production were similar for all strains except in the case of Actinobacterium sp. Mayor and the consortium, where glucose was replaced by sodium carbonate as a carbon source. Multi-nitrogen source was the best nitrogen source compare to individual sources for both strains. The divalent cation, Ca2+ proved to be a better flocculating activity stimulus for all produced bioflocculants in this study. The optimum flocculating activities obtained for both individual strains and the consortium were all at alkaline pH. The yield of purified bioflocculant produced by the consortium was 8.203 g/l, while 4.190 g/l and 4.610 g/l were recovered for single strains of Actinobacterium sp. Mayor and Methylobacterium sp. Obi respectively. Further characterization of pure bioflocculants revealed that a bioflocculant dosage of 0.3 mg/ml resulted in the highest flocculating activity for both individual strains while 1.0 mg/ml of the bioflocculant produced by the consortium was required to enhance maximum flocculating efficiency. These bioflocculants proved to be all thermo stable at a temperature range of 20 to 900°C with a heating rate of 10oC/min under a constant flow of nitrogen gas. The presence of functional groups normally required for bioflocculation such as hydroxyl, carboxyl and amino was also detected. The findings of this study suggest that the producedbioflocculants can be utilized as excellent substitutes for harmful synthetic flocculants in both water and wastewater treatments as well as in other industrial applications.
|
66 |
Flocculation of wastewater from the production of low voc paintsGina, Dumisa Cornelius 14 May 2008 (has links)
Abstract
This dissertation describes a study of the treatment of wastewater using the
flocculation process. Wastewater samples from Barloworld Plascon paints were
used for the research.
Environmental pressure has necessitated the introduction of a new generation of
low-solvent paints. The behaviour of these in coagulation and flocculation
treatment processes has not been investigated previously. The optimum
flocculent dosage for these paints was investigated. It was found that for paint
wastewater to be flocculated, the effect of the dispersants needs to be
counteracted, which destabilizes the colloidal suspension, enabling flocculation
and settling to occur. Results showed a correlation between the solid content of
wastewater and flocculent dosage.
Changes in redox potential have been found to be associated with good
flocculation. In this work, redox potential was evaluated as an indicator for
destabilisation of the dispersants. It was shown that redox potential can be used
as an indicator of good flocculation at low dispersant concentrations. Owing to
the importance of the hydrolysis reactions of Al3+ in flocculation, which are
affected by pH, the pH range in which good flocculation occurs was determined.
Results show that optimal flocculation occurred between pH 4 and 5.
A strong relationship between flocculent dosage and particle nucleation and
growth was observed. Results also showed that mixing improves flocculation
kinetics.
|
67 |
The Effect of Polyelectrolytes Used as Flocculants on Microorganisms Present in Receiving StreamsMourato, Diana January 1983 (has links)
Note:
|
68 |
The influence of polysaccharides on sub-surface soil properties and interactionsMourato, Diana January 1990 (has links)
Note:
|
69 |
Particle flocculation dynamics in water: numerical simulation and experimental verification張健君, Zhang, Jianjun. January 2002 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
|
70 |
Hydrodynamic property and breakage behavior of particle aggregates in water: theoretical modeling, CFD simulationand PIV investigationXiao, Feng, 萧峰 January 2009 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
|
Page generated in 0.1323 seconds