Ultrafiltration of protein and humic substances: effect of solution chemistry on fouling and flux decline |
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| Affiliation: | 1. Nanjing Tech University, China;2. Institute of Process Engineering, CAS, China;1. Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China;2. College of Environment, Hohai University, Nanjing 210098, PR China;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China;2. Research and Application Center for Membrane Technology, School of Environment, Tsinghua University, Beijing 100084, China |
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| Abstract: | The rate and extent of adsorption of a protein and a humic acid onto membranes was measured at varying conditions of pH and ionic strength. The resistance-in-series approach was used to calculate reversible and irreversible fouling resistances, which were then compared for static (no flow) and dynamic runs in order to determine the effect of convective flow and electrostatic interactions on fouling behavior. Although convective forces tended to increase the amount of material accumulated near the membrane surface, electrostatic interactions played a stronger role, as evident in the irreversible adsorption results for the static and dynamic cases. Electrostatic interactions affected reversible and irreversible resistances. Both resistances were higher at the isoelectric point (iep) of the protein and decreased at higher pH values. Humic acid adsorption decreased as pH was increased from 4.7 to 10. Humic acid filtration resulted in a higher resistance per unit mass than protein filtration. |
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