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Title: Pressure electroosmotic dewatering with continuous removal of electrolysis products
Authors: Larue, O.
Wakeman, Richard J.
Tarleton, E.S.
Vorobiev, E.
Keywords: Filtration
Electric field
Issue Date: 2006
Publisher: © Elsevier
Citation: LARUE, O. ... et al, 2006. Pressure electroosmotic dewatering with continuous removal of electrolysis products. Chemical Engineering Science, 61 (14), pp. 4732-4740
Abstract: Pressurised electroosmotic dewatering (PED) is usually implemented in classical filters with the electrodes making a direct contact with the material or the filter cloths. Thus, electrolysis products generated at the electrodes (gas, ions) tend to accumulate in the solid/liquid mixture being dewatered. This results in a non-uniform distribution of water content, porosity, electric field intensity, and particle zeta potential throughout the mixture, affecting progress of the PED process. This paper proposes a specific design of filter press to study PED in the absence of disturbances from electrolysis products. An experimental study was carried out on a gelatinous bentonite suspension at 8.5% w/w solid. The influence of the ionic conductivity of suspension (2-25 mS/cm), the current intensity (20-300 mA) and the pressure (2.5-15 bar) were investigated. In order to improve the energetic yield of PED, the conductivity and current intensity should be limited, as observed in earlier works. The pressure increase considerably aids the water removal and leads to better product dryness. For PED at 15 bar and 100 mA, the bentonite reached 40% w/w solid for 0.7 kWh/kg of water removed. This study emphasizes that to analyse PED precisely it is important to clarify the dependence of the electroosmotic flow rate on the porosity and pressure.
Description: This article was published in the journal, Chemical Engineering Science [© Elsevier] and the definitive version is available at: www.elsevier.com/locate/ces
Version: Accepted for publication
DOI: 10.1016/j.ces.2006.02.006
URI: https://dspace.lboro.ac.uk/2134/4770
ISSN: 0009-2509
Appears in Collections:Published Articles (Chemical Engineering)

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