Flux decline during cross flow membrane filtration of electrolytic solution in presence of charged nano-colloids: A simple electrokinetic model

De, Sirshendu; Bhattacharjee, Subir

doi:10.1016/j.jcis.2010.09.085

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…For the concentration of particles strongly affected by Brownian motion, ultrafiltration (UF) has become a standard method whose major advantage is its low energy requirement. It is extensively used for the purification and concentration of a large variety of proteins [1][2][3][4][5][6][7][8][9], food stuff [10], industrial enzymes and antibody fragments [11,12], and waste water treatment [13]. UF takes place also in Bowman's capsule of the human kidneys where water and other small molecules are separated from blood [14].…”

Section: Introductionmentioning

confidence: 99%

Ultrafiltration of charge-stabilized dispersions at low salinity

et al. 2016

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We present a comprehensive study of cross-flow ultrafiltration (UF) of charge-stabilized suspensions, under low-salinity conditions of electrostatically strongly repelling colloidal particles. The axially varying permeate flux, near-membrane concentration-polarization (CP) layer and osmotic pressure profiles are calculated using a macroscopic diffusion-advection boundary layer method, and are compared with filtration experiments on aqueous suspensions of charge-stabilized silica particles. The theoretical description based on the one-component macroion fluid model (OCM) accounts for the strong influence of surface-released counterions on the renormalized colloid charge and suspension osmotic compressibility, and for the influence of the colloidal hydrodynamic interactions and electric double layer repulsion on the concentration-dependent suspension viscosity η, and collective diffusion coefficient Dc. A strong electro-hydrodynamic enhancement of Dc and η, and likewise of the osmotic pressure, is predicted theoretically, as compared with their values for a hard-sphere suspension. We also point to the failure of generalized Stokes-Einstein relations describing reciprocal relations between Dc and η. According to our filtration model, Dc is of dominant influence, giving rise to an only weakly developed CP layer having practically no effect on the permeate flux. This prediction is quantitatively confirmed by our UF measurements of the permeate flux using an aqueous suspension of charged silica spheres as the feed system. The experimentally detected fouling for the largest considered transmembrane pressure values is shown not to be due to filter cake formation by crystallization or vitrification.

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Section: Introductionmentioning

confidence: 99%

Ultrafiltration of charge-stabilized dispersions at low salinity

et al. 2016

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“…This parameter quantified the apparent viscosity ( /g a μ μ = * ) in previous models (Bowen and Jenner, 1995b;De and Bhattacharjee, 2011;Rice and Whitehead, 1965). However, in this study, g * is * ).…”

Section: Hydrodynamic Resistance and Electroosmotic Back Flowmentioning

confidence: 84%

“…Transport of ions through the interstices of cake layer develops streaming potential which generates EOBF, thus imposing additional electroviscous resistance (Bowen and Jenner, 1995a;De and Bhattacharjee, 2011;Schaefer and Nirschl, 2010;Schafer and Nirschl, 2005). Therefore, the total cake layer resistance consists of the hydrodynamic resistance of the stationary bed and electroviscous resistance due to the presence of charged colloidal particles.…”

Section: Hydrodynamic Resistance and Electroosmotic Back Flowmentioning

confidence: 99%

“…Hence, fouling and performance decline occurs in a very complex manner including combination of concentration polarization (CP), cake and/or gel formation, and scaling. Fouling due to cake formation of retained colloids and CP of rejected salts is evident in numerous NF processes (De and Bhattacharjee, 2011;Hoek and Elimelech, 2003;Yaun and Kilduff, 2010). The fouling phenomena depend on the size, charge and concentration of particles; ionic strength; membrane permeability; and the salt rejection.…”

Section: Introductionmentioning

confidence: 99%

“…The transport of mobile charges in the EDL toward the membrane-cake layer interface causes accumulation of charges on the membrane surface, thereby generates a back flow of water called EOBF. De and Bhattacharjee (2011) presented another electrokinetic model to determine the cake resistance and transient flux decline for membrane fouling by charged colloids. They considered the cake structure as charged nano-pores to estimate the electroviscous effect.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Colloidal fouling of nanofiltration membranes: A novel transient electrokinetic model and experimental study

Mamun

Sadrzadeh

Chatterjee

et al. 2015

Chemical Engineering Science

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Sherwood number in flow through parallel porous plates (Microchannel) due to pressure and electroosmotic flow

Vennela

Mondal

et al. 2011

AIChE Journal

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An expression for Sherwood number is developed from first principles for combined pressure‐driven and electroosmotic flow in a porous rectangular microchannel. This quantifies the mass transfer of an electrically neutral solute in the microchannel and is useful for designing microfluidic devices and porous media flows. The convective‐diffusive species balance equation, coupled with the velocity field, is solved within the mass transfer boundary layer utilizing similarity method. From the simulations, it is observed that the Sherwood number increases as the electric double layer near the channel wall becomes more compact (as manifested through a decrease in the Debye length), and it reaches a constant value around the scaled Debye length of 40. The Sherwood number becomes constant at higher Debye lengths as electrokinetic effects become negligible. A detailed analysis of dependence of Reynolds number, dimensionless permeation velocity, ratio of driving force and scaled Debye length on Sherwood number is presented. © 2011 American Institute of Chemical Engineers AIChE J, 58: 1693–1703, 2012

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Flux decline during cross flow membrane filtration of electrolytic solution in presence of charged nano-colloids: A simple electrokinetic model

Cited by 11 publications

References 33 publications

Ultrafiltration of charge-stabilized dispersions at low salinity

Ultrafiltration of charge-stabilized dispersions at low salinity

Colloidal fouling of nanofiltration membranes: A novel transient electrokinetic model and experimental study

Sherwood number in flow through parallel porous plates (Microchannel) due to pressure and electroosmotic flow

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