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).
The characterisation of slurry dewatering
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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