Zeta-potential and local filtration properties: Constitutive relationships for TiO(2) from experimental filtration measurements
Artikel i vetenskaplig tidskrift, 2011

The use of filtration to separate solid from liquids is a commonly-used unit operation employed in a range of different applications. The development of accurate models is therefore important in facilitating e.g. design, scale-up and troubleshooting. Accurate constitutive relationships between local filtration properties need to be formulated in order to form precise models of the filtration process. One important parameter that is seldom considered explicitly in filtration models is the inter particle forces, e. g. electrostatic forces. The aim of this study is to investigate local filtration properties, under controlled conditions, for the model material TiO(2) where the zeta-potential, and thereby one important parameter affecting the inter-particle interactions, is altered. In this study the local solidosity is measured during filtration by gamma-attenuation, the local pressure is measured using capillary tubes. These data are used to calculate the local specific filtration resistance. The compressibility of the filtration cake was changed substantially by altering the zeta-potential. Several published constitutive relationships between local data and specific filtration resistance were applied; they yielded very similar parameters that were in good accordance with the characterization of the material. (C) 2011 Elsevier Ltd. All rights reserved.

porosity

expression

cake filtration

p1373

flow

sludge

pressure

suspensions

ase gg

filter cake

Porous media

Separations

particles

zeta-potential

v47

Local properties

1992

Filtration

Mathematical modelling

Författare

Tuve Mattsson

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Maria Sedin

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 66 20 4573-4581

Ämneskategorier

Kemiteknik

DOI

10.1016/j.ces.2011.06.012