Water Science & Technology: Water Supply Vol 1 No 2 pp 141–150 © IWA Publishing 2001
From basic investigations to pilot plant tests of depth filtration with
permeable synthetic collectors
A Nahrstedt*, K Esperschidt** and R Gimbel***
*
IWW Rheinisch-Westfälisches Institut für Wasserforschung
GmbH, Moritzstr. 26, D-45476 Mülheim/Ruhr, Germany
**
Riedel-de Haen GmbH - Speciality Chemicals, P. O. Box 100262,
D-30918 Seelze, Germany
***
Gerhard-Mercator-University Duisburg,
Department of Process Engineering/Water Technology, P.O. Box 101503,
D-47048 Duisburg, Germany
ABSTRACT
Permeable Synthetic Collectors (PSCs) are bodies of some millimetres
consisting of a highly porous arrangement of fixed fibres or open-porous
plastic foam. The advantages of the application of this media in deep bed
filtration were studied. The theoretical analysis of the particle transport
efficiency was based on the numerical solution of the flow field and on
trajectory calculations for non-Brownian particles. Investigations with an
endoscope allowed the consideration of the particle adhesion on the surface
of the inner fibres. The resulting filter coefficients are compared with
experimental data. The application of PSC filtration in a pilot scale unit
for wastewater treatment performs much better in contrast to conventional
filter grains (sand, anthracite etc.), especially under high rate conditions.
In the future, the deep filtration can be applied to new fields of the topic
of solid liquid separation with smaller units, lower pressure drop and
higher filtration rates.
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