One-dimensional model of vacuum filtration of compressible flocculated suspensions

This work details the one-dimensional modeling of the different processes that may occur during the vacuum filtration of compressible flocculated suspensions. Depending on the operating conditions of the applied pressure and the initial solids concentration relative to the material properties of the...

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Bibliographic Details
Published in:AIChE journal 2010-10, Vol.56 (10), p.2622-2631
Main Authors: Stickland, Anthony D, de Kretser, Ross G, Scales, Peter J
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
compressional rheology
Compressive properties
Consolidation
Desaturation
Dewatering
Exact sciences and technology
Filters
Filtration
Flocculating
Fluid dynamics
Fracture mechanics
Liquid-liquid and fluid-solid mechanical separations
Materials science
mathematical modeling
Mathematical models
Physical properties
Rheology
solid/liquid separations
suspensions
vacuum filtration
Walls
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Summary:This work details the one-dimensional modeling of the different processes that may occur during the vacuum filtration of compressible flocculated suspensions. Depending on the operating conditions of the applied pressure and the initial solids concentration relative to the material properties of the compressive yield stress and the effective capillary pressure at the air-liquid interface, the dewatering process undergoes a combination of cake formation, consolidation, and/or desaturation. Mathematical models for these processes based on the compressional rheology approach are presented and appropriate solution methods outlined. Results using customary material properties are given for different operating conditions to illustrate the three dewatering processes. This approach lays the theoretical basis for further work understanding two- and three-dimensional effects during desaturation, such as cracking and wall detachment. © 2010 American Institute of Chemical Engineers AIChE J, 2010
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12194