Effect of ionic strength and pH on hydraulic properties and structure of accumulating solid assemblages during microfiltration of montmorillonite suspensions

Santiwong, S.R.; Guan, Jing; Waite, T. David

doi:10.1016/j.jcis.2007.09.052

Cited by 37 publications

(28 citation statements)

References 58 publications

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“…Colloidal montmorillonite suspensions were prepared using the procedure established by Santiwong et al [14]. Briefly, the montmorillonite was obtained from a naturally-sourced Australian bentonite (TRUBOND; Unimin, Australia), which was dispersed in Milli-Q water (Millipore; USA) and size-fractionated by centrifugation before mixing with NaCl (to 1 mol/L).…”

Section: Preparation Of Na-montmorillonite Suspensionsmentioning

confidence: 99%

“…The dead-end filtration methodology employed in this study has been used previously to determine the hydraulic properties of montmorillonite suspensions [14,24]. Briefly, the sorptivity, a measure of the diffusivity/water-content relationship [25], is obtained from the relationship (Eq.…”

Section: Dead-end Filtration Theorymentioning

confidence: 99%

“…In fact, many studies examining the impact of changes to solution pH and cation concentration have been undertaken, including those of Benna et al [8], Carlson et al [11], Di Maio [12] and Mohan and Folger [13]. In focussing on membrane filtration fouling, Santiwong and colleagues [14] showed that concentrations of calcium (50 mM) at pH 4 had the ability to increase the hydraulic conductivity of a Na-montmorillonite 10-fold. Supported by electron microscopy, the authors proposed that calcium ions induced structural changes in the nematically ordered assemblage which resulted in significant enhancement in hydraulic conductivity in the samples exposed to solutions containing elevated calcium concentrations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions

Kinsela¹,

Tjitradjaja²,

Collins³

et al. 2010

Journal of Colloid and Interface Science

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Section: Preparation Of Na-montmorillonite Suspensionsmentioning

confidence: 99%

Section: Dead-end Filtration Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions

Kinsela¹,

Tjitradjaja²,

Collins³

et al. 2010

Journal of Colloid and Interface Science

Self Cite

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“…The coefficients C 11 to C 22 depend on the particle charge and on the pore structure of the packed bed, which is influenced by the formation of agglomerates in the suspension from which the packed bed was formed. The stability of suspensions against agglomeration is described by the DLVO theory [1,4,8]. A packed bed formed from a stable suspension has a dense structure with a homogeneous pore size distribution and a low permeability.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Further, the pore structure itself also depends on the same parameters as the surface charge and the ion distribution in the EDL, that is, the pH value and the ionic strength of the liquid [1,4]. Many researchers describe EHT with elaborate spherical cell models, for which the continuity and stokes equation are solved (see [5] for a recent review).…”

Section: Introductionmentioning

confidence: 99%

Influence of pH and Compression on Electrohydrodynamic Effects in Nanoporous Packed Beds

Schaefer

Nirschl

2009

Physical Separation in Science and Engineering

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Fluid flow and charge transport in fine structures can be driven both by pressure gradients and by electric fields if electrochemical double layers are present on the surfaces. The interrelated electrohydrodynamic effects may be used to drive liquids without moving parts, for example, in dewatering or in electroosmotic chromatography, or to generate small electric currents. While the electrohydrodynamic transport is well understood for simple geometries, models for porous structures are complex. Furthermore, the interconnected porous structure of a packed bed itself strongly depends on the electrochemical double layers. In this study, the electrohydrodynamic transport in packed beds consisting of boehmite particles with an average diameter of 38 nm is investigated. We describe a new approach to the electrokinetic effects by treating the packed beds as theoretical sets of cylindrical capillaries. The charge transport and the electrically driven fluid flow predicted with this model agree well with experimental results. Furthermore, the hydraulic permeability was found to be a nonlinear function of the porosity, independent of whether the porosity change is caused by changing the compression or the electrochemical double layer.

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Microfiltration

Chellam¹

2013

Encyclopedia of Membrane Science and Technology

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Microfiltration (MF) and ultrafiltration are popular in drinking water and wastewater treatment because integral membranes are absolute barriers for difficult‐to‐inactivate pathogenic protozoa, and the turbidity of membrane‐filtered water is well below current and anticipated regulations. The focus of this section is to provide a broad overview of MF from an environmental engineering viewpoint, including its capabilities and limitations, as it pertains to water and wastewater treatment, configuration and field testing of commercially available systems before full‐scale implementation, and mechanisms and control of fouling. Other industrial applications of microfiltration are also briefly discussed. Constant pressure and constant flux blocking laws to predict fouling mechanisms during dead‐end MF are briefly summarized. The use of chemical coagulation and electrochemical pretreatment to improve MF performance in terms of both fouling and filtered water quality (with respect to natural organic matter, disinfection by‐product precursors, and viruses) is also discussed.

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Effect of ionic strength and pH on hydraulic properties and structure of accumulating solid assemblages during microfiltration of montmorillonite suspensions

Cited by 37 publications

References 58 publications

Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions

Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions

Influence of pH and Compression on Electrohydrodynamic Effects in Nanoporous Packed Beds

Microfiltration

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