Effect of floc concentration on the rheology of a ferric floc

The primary interest of this work is to determine the effect of floc concentration on ferric floc particle interactions and hence, rheology. In accordance with established theory, ferric floc viscosity exhibits a non‐linear increase with solids content, with the viscosity increasing sharply above a...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2004-02, Vol.79 (2), p.126-131
Main Authors: McMinn, Wendy AM, Keown, James, Allen, Stephen J, Burnett, Michael G
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
ferric floc
particle interactions
power law equation
viscosity
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Summary:The primary interest of this work is to determine the effect of floc concentration on ferric floc particle interactions and hence, rheology. In accordance with established theory, ferric floc viscosity exhibits a non‐linear increase with solids content, with the viscosity increasing sharply above a concentration of 12 000 ppm. Shear effectively breaks down floc structure, and thus reduces viscosity, the extent of which is independent of solids content. The effect of shear is also observed to diminish over time and can be adequately characterised by a power law model. Addition of aluminium nitrate to ferric floc increases the quantity of water bound within the floc, and thus produces suspensions which are more viscous in nature. Copyright © 2003 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.948