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Agglomeration and filtration of colloidal suspensions with DLVO interactions in simulation and experiment

By B Schäfer, M Hecht, JDR Jens Harting and H Nirschl

Abstract

Cake filtration is a widely used solid-liquid separation process. However, the high flow resistance of the nanoporous filter cake lowers the efficiency of the process significantly. The structure and thus the permeability of the filter cakes depend on the compressive load acting on the particles, the particles size, and the agglomeration of the particles. The latter is determined by the particle charge and the ionic strength of the suspension, as described by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. In this paper, we propose a combined stochastic rotation dynamics (SRD) and molecular dynamics (MD) methodology to simulate cake formation. Our method does not only allow studying the influence of the material parameters, but also accounts for long-range hydrodynamic interactions between particles. A stepwise reduction of the simulation volume leads to the formation and homogenous compression of the filter. Its permeability, as investigated with lattice Boltzmann (LB) simulations of flow through the discretized cake, depends on the particle size and porosity. Our results agree qualitatively with experimental data obtained from colloidal boehmite suspensions

Publisher: Academic Press Inc.
Year: 2010
OAI identifier: oai:library.tue.nl:709525
Provided by: Repository TU/e
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