Understanding particle deposition kinetics on NF membranes: A focus on micro-beads and membrane interactions at different environmental conditions

TY - JOUR

T1 - Understanding particle deposition kinetics on NF membranes

T2 - A focus on micro-beads and membrane interactions at different environmental conditions

AU - Cao, Huayu

AU - Habimana, Olivier

AU - Semião, Andrea J.C.

AU - Allen, Ashley

AU - Heffernan, Rory

AU - Casey, Eoin

N1 - Publisher Copyright: © 2014 Elsevier B.V.

PY - 2015/2/1

Y1 - 2015/2/1

N2 - The significance of nanofiltration membrane surface properties when interacting with microbeads with and without permeate flux was investigated. This was achieved by characterising the surface tension and zeta potential of micro-beads and NF90 membranes to determine the colloid-membrane interaction forces. Dynamic adhesion assays under different ionic strengths (0.1M and 0.01M) and pH (5, 7, and 9) were conducted. Experimental results showed that at high ionic strength, pH does not have a significant effect on adhesion rates, while at low ionic strength the adhesion rate increased at pH 7 (4.56s-1cm-2) compared to pH 5 and pH 9, with rates of 2.69 and 3.66s-1cm-2 respectively. A model was devised to predict colloidal adhesion onto membranes under increasing permeate flux conditions, taking into account all interaction forces. Model predictions indicate that drag force overwhelms all other colloid-membrane interaction forces when the permeate flux increases to 7.2Lh-1m-2. This study suggests that altering membrane surface properties for the prevention of fouling may be limited in its success as an antifouling strategy.

AB - The significance of nanofiltration membrane surface properties when interacting with microbeads with and without permeate flux was investigated. This was achieved by characterising the surface tension and zeta potential of micro-beads and NF90 membranes to determine the colloid-membrane interaction forces. Dynamic adhesion assays under different ionic strengths (0.1M and 0.01M) and pH (5, 7, and 9) were conducted. Experimental results showed that at high ionic strength, pH does not have a significant effect on adhesion rates, while at low ionic strength the adhesion rate increased at pH 7 (4.56s-1cm-2) compared to pH 5 and pH 9, with rates of 2.69 and 3.66s-1cm-2 respectively. A model was devised to predict colloidal adhesion onto membranes under increasing permeate flux conditions, taking into account all interaction forces. Model predictions indicate that drag force overwhelms all other colloid-membrane interaction forces when the permeate flux increases to 7.2Lh-1m-2. This study suggests that altering membrane surface properties for the prevention of fouling may be limited in its success as an antifouling strategy.

KW - Adhesion

KW - Biofouling

KW - Microbead

KW - Nanofiltration

KW - XDVLO

UR - http://www.scopus.com/inward/record.url?scp=84911451365&partnerID=8YFLogxK

U2 - 10.1016/j.memsci.2014.10.038

DO - 10.1016/j.memsci.2014.10.038

M3 - 文章

AN - SCOPUS:84911451365

SN - 0376-7388

VL - 475

SP - 367

EP - 375

JO - Journal of Membrane Science

JF - Journal of Membrane Science

ER -