Membrane filtration of dextran solutions with water and formamide as solvent
- 6 June 2021
- journal article
- research article
- Published by Taylor & Francis Ltd in Separation Science and Technology
- Vol. 57 (4), 1-19
- https://doi.org/10.1080/01496395.2021.1922447
Abstract
In this study, we investigated and compared the performance (permeate flux, solute rejection and membrane fouling) of an ultrafiltration membrane and a nanofiltration membrane with water and formamide as solvent. The dextran solutions with water as solvent had lower electrical conductivity and usually greater surface charge compared to that in formamide, which facilitated the electrostatic interactions taken place. As a result, faster flux decline and greater fouling resistance were usually observed in water-based solutions in both UF and NF with the same dextran used as solute. In UF, the solute rejection usually increased as the solvent switched from formamide to water, since stronger electrostatic interactions tended to impede the transport of solute through membrane. Opposite trend was found with NF, that formamide usually led to higher solute rejection compared to water as solvent. Despite the differences of surface charge altered the membrane performance prominently, no quantitative correlation was found between permeate flux and zeta potential values. The analysis using a modified Hermia’s pore blocking model indicates that the fouling mechanisms could be altered as the change of solute to membrane pore size ratio, surface charge of membranes and solutes, as well as the solvent properties.Keywords
Funding Information
- GSK (GlaxoSmithKline) – EDB (Economic Development Board) Trust Fund
This publication has 58 references indexed in Scilit:
- Pretreatment and Membrane Hydrophilic Modification to Reduce Membrane FoulingMembranes, 2013
- Protein fouling of nanofiltration, reverse osmosis, and ultrafiltration membranes—The role of hydrodynamic conditions, solution chemistry, and membrane propertiesJournal of Membrane Science, 2011
- Colloidal surface interactions and membrane fouling: Investigations at pore scaleAdvances in Colloid and Interface Science, 2011
- Comparison of humic acid rejection and flux decline during filtration with negatively charged and uncharged ultrafiltration membranesWater Research, 2011
- Solvent-dependent permeability in asymmetric ceramic membranes with tortuous or non-tortuous mesoporesJournal of Membrane Science, 2008
- Influence of calcium on the evolution of irreversible fouling in microfiltration/ultrafiltration membranesJournal of Water Supply: Research and Technology—AQUA, 2007
- Effect of Membrane Charge on Flow and Protein Transport during UltrafiltrationBiotechnology Progress, 2006
- Effects of membrane fouling on solute rejection during membrane filtration of activated sludgeProcess Biochemistry, 2001
- Electrostatic and Electrokinetic Interactions during Protein Transport through Narrow Pore MembranesIndustrial & Engineering Chemistry Research, 1994
- Study of protein transmission through ultrafiltration membranesJournal of Membrane Science, 1993