Rapid filtration measurement of dewatering design and optimization parameters

To characterize and optimize the compressive dewatering of suspensions, rapidly determinable material parameters are required. A mathematical framework exists for characterization of dewatering using three parameters: the compressive yield stress Py (ϕ), the hindered settling function r(ϕ), and a so...

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Bibliographic Details
Published in:AIChE journal 2001-08, Vol.47 (8), p.1758-1769
Main Authors: de Kretser, Ross G., Usher, Shane P., Scales, Peter J., Boger, David V., Landman, Kerry A.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Filtration
Liquid-liquid and fluid-solid mechanical separations
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Summary:To characterize and optimize the compressive dewatering of suspensions, rapidly determinable material parameters are required. A mathematical framework exists for characterization of dewatering using three parameters: the compressive yield stress Py (ϕ), the hindered settling function r(ϕ), and a solids diffusivity D(ϕ). A new variation on traditional constant pressure, batch filtration tests is described along with a computer‐controlled filtration apparatus that enables complete characterization of a suspension with respect to dewatering in a matter of hours. The testing methods are validated experimentally on flocculated zirconia suspensions along with calculation of the material dewatering parameters. Application of the calculated parameters to modeling of a real filtration test shows excellent agreement. Practical implications of the modeling are also discussed.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690470808