The dewatering of flocculated suspensions presents a significant challenge to water and waste water processing operations world-wide. Traditionally the dewatering process is enhanced through the use of flocculants or a surface chemical modifier to draw together fine particles and increase settling rates and sediment permeabilities, however, present methods of gauging chemical performance are somewhat empirical. Recently, Landman and White developed a theory of suspension filtration which incorporates the compressibility and permeability of a sediment into a filtration diffusivity, D(φ). D(φ) is a material property used to calculate the time scale of a dewatering process from first principles for a given set of process conditions i.e. final desired solids concentration, applied pressure, initial sediment height. A model alumina system and an alum water treatment sludge have been used to show the effect of flocculation conditions on compressibility, permeability (determined from filtration experiments) and the diffusivity, D(φ).
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Research Article| April 01 2000
The characterisation of slurry dewatering
A. A. Aziz;
R. G. de Kretser;
D. R. Dixon;
D. R. Dixon
1Particulate Fluids Processing Centre, Department of Chemical Engineering, University of Melbourne, Victoria, 3010, Australia
*CSIRO Molecular Science, Ian Wark Laboratory, Private Bag 10, Clayton, Victoria, 3169, Australia
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Water Sci Technol (2000) 41 (8): 9–16.
A. A. Aziz, R. G. de Kretser, D. R. Dixon, P. J. Scales; The characterisation of slurry dewatering. Water Sci Technol 1 April 2000; 41 (8): 9–16. doi: https://doi.org/10.2166/wst.2000.0136
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