Sedimentation and water electrolysis effects in electrofiltration of kaolin suspension

Larue, O.; Vorobiev, Eugène

doi:10.1002/aic.10227

Cited by 31 publications

(19 citation statements)

References 21 publications

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“…In an electric field of proper polarity, electrophoresis reduces the rate of cake formation and increases the rate of permeation through the filter cake by electroosmosis. Various laboratory-scale research results have shown that electrofiltration greatly enhanced the filtration kinetics of aqueous suspensions of anatase [7], quartz sand [8], and kaolin [9]. A similar finding was also obtained in a pilot-scale electrofiltration of SiO 2 using a polyamide membrane with a 0.2-m pore size [10].…”

Section: Introductionsupporting

confidence: 71%

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Electrofiltration of silica nanoparticle-containing wastewater using tubular ceramic membranes

Yang

2007

Separation and Purification Technology

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Section: Introductionsupporting

confidence: 71%

“…It has been reported that a combination of mechanical and electrical filtration (i.e., electrofiltration) can be effective in enhancing membrane flux [6][7][8][9]. In crossflow filtration the bulk flow is tangential to the membrane where there is also a convective flow into the porous surface.…”

Section: Introductionmentioning

confidence: 99%

Electrofiltration of silica nanoparticle-containing wastewater using tubular ceramic membranes

Yang

2007

Separation and Purification Technology

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“…Note that electrolytic ions H 3 O + and OH -may also have a negative effect on the electroosmotic flow (equations A2 and C1), especially in clays. For instance, if a DC electric field is applied, H 3 O + ions accumulate in the filter cake with the anode side becoming acid and OH -ions at the cathode side becoming basic (Larue and Vorobiev, 2004). In acidic conditions, the adsorption of H 3 O + on usually negatively charged particles (clays) make │ζ│ collapse, thus the electroosmotic drainage will cease in the cake at the anode side.…”

Section: Electrolysis Reactions At Electrodesmentioning

confidence: 99%

“…They noted a non-uniform distribution of water content, pH, porosity, electric field intensity and particles zeta potential throughout the mixture. The electrolysis reactions at the electrodes account for this behaviour (Larue and Vorobiev, 2004).…”

Section: Introductionmentioning

confidence: 99%

Pressure electroosmotic dewatering with continuous removal of electrolysis products

Larue

Wakeman

Tarleton

et al. 2006

Chemical Engineering Science

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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.

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“…Additionally to biopolymer suspensions many research groups investigated dead-end electrofiltration of mineral suspensions [49,66,73,75,92,109,114].…”

Section: The Technology Of Electrofiltrationmentioning

confidence: 99%

Electrofiltration of Biopolymers

Gözke

Posten

2010

Food Eng. Rev.

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Downstream processing of bioproducts, based on the number of purification steps involved, is the most expensive part in biotechnology and food production processes. Combination of several purification steps, including membrane filtration and electrophoresis, within a single technique is known as electrofiltration-a process based on application of electric field on a dead-end filtration system parallel to the filtrate's flow direction. In this process, biopolymers, generally charged molecules with high viscosity, undergo both electrophoretic and hydrodynamic forces, reducing the thickness of the filter cake formed. As a result, electrofiltration can reduce processing time to minutes instead of hours when using conventional filtration. The objective of the present review is to assess the possibilities to purify technically and commercially important biopolymers like poly(3-hydroxybutyrate), hyaluronic acid, chitosan and xanthan by electrofiltration.

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Sedimentation and water electrolysis effects in electrofiltration of kaolin suspension

Abstract: Filtration combined with an electric field (electrofiltration) enhances the filtration

Cited by 31 publications

References 21 publications

Electrofiltration of silica nanoparticle-containing wastewater using tubular ceramic membranes

Electrofiltration of silica nanoparticle-containing wastewater using tubular ceramic membranes

Pressure electroosmotic dewatering with continuous removal of electrolysis products

Electrofiltration of Biopolymers

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