Transient deposition of colloidal particles in heterogeneous porous media
L Song, M Elimelech - Journal of Colloid and Interface Science, 1994 - Elsevier
Journal of Colloid and Interface Science, 1994•Elsevier
A general theoretical model for particle deposition and transport in heterogeneous porous
media is developed. The model can describe the transient particle deposition and the
nonuniform particle coverage of porous media surfaces, resulting from surface charge
heterogeneity, surface roughness, or other unevenly distributed surface properties. The
model is applied to a packed-bed column with spherical collectors whose surfaces are
hetero geneously charged. Results indicate that, under unfavorable chemical conditions, it is …
media is developed. The model can describe the transient particle deposition and the
nonuniform particle coverage of porous media surfaces, resulting from surface charge
heterogeneity, surface roughness, or other unevenly distributed surface properties. The
model is applied to a packed-bed column with spherical collectors whose surfaces are
hetero geneously charged. Results indicate that, under unfavorable chemical conditions, it is …
Abstract
A general theoretical model for particle deposition and transport in heterogeneous porous media is developed. The model can describe the transient particle deposition and the nonuniform particle coverage of porous media surfaces, resulting from surface charge heterogeneity, surface roughness, or other unevenly distributed surface properties. The model is applied to a packed-bed column with spherical collectors whose surfaces are hetero geneously charged. Results indicate that, under unfavorable chemical conditions, it is the degree of surface charge heterogeneity that mainly determines the transient (dynamic) deposition behavior. This transient behavior can be predicted by the flux-correcting function, a function strongly dependent on the charge heterogeneity of solid surfaces. It is further shown that the effect of surface charge heterogeneity on particle deposition dynamics can be quantitatively represented by a few parameters. These parameters are λ, the fraction of favorable surface sites, and α, the collision efficiency of colloidal particles with the unfavorable surface in the patchwise charge distribution model; and ψ0, the average surface potential, and σ, the standard deviation of surface potential in the normal charge distribution model.
Elsevier
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