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dc.contributor.authorLi, Xinen_US
dc.contributor.authorLiu, Changen_US
dc.contributor.authorYin, Wenqiangen_US
dc.contributor.authorChong, Tzyy Hauren_US
dc.contributor.authorWang, Rongen_US
dc.identifier.citationLi, X., Liu, C., Yin, W., Chong, T. H., & Wang, R. (2019). Design and development of layer-by-layer based low-pressure antifouling nanofiltration membrane used for water reclamation. Journal of Membrane Science, 584, 309-323. doi:10.1016/j.memsci.2019.05.013en_US
dc.description.abstractRecent studies have confirmed the advantages of low-pressure nanofiltration (NF) membranes in integrated nanofiltration membrane bioreactor system followed by the reverse osmosis (RO) process for high recovery water reclamation. However, fouling of low-pressure NF membranes restricts their application in providing high quality feed to subsequent RO process. In this study, an antifouling low-pressure NF membrane was designed and fabricated via rapid co-deposition of polydopamine (PDA)/polyethylenimine (PEI) on electrostatic layer-by-layer (LBL) assembled polyethersulfone (PES) flat sheet membrane followed by crosslinking with glutaraldehyde. The optimized resultant membrane (LBL-cPP) presented approximately 11 LMH/bar pure water permeability with more than 90% rejection divalent cations under 2 bar pressure. The newly developed selective layer exhibited excellent antifouling performance and chemical stability ascribing to the inherent hydrophilicity of PDA/PEI and dual covalent reaction of PDA with the LBL layer. By feeding real municipal wastewater, the LBL-cPP membrane also achieved superior permeate quality, leading to lower RO fouling rate in subsequent RO unit as compared to commercial NF 270 membrane. Further organic foulant analysis indicated that 96.8% of dissolved organic carbons were effectively removed by the LBL-cPP membrane. Specifically, the novel NF membrane demonstrated high removal rate (>93%) for foulants with low molecular weights which was largely responsible for RO fouling, while maintaining the desired flux recovery rate and reduced cleaning frequency. This study demonstrates the potential of PDA/PEI modified low-pressure NF membranes in designing efficient and sustainable water reclamation technology.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.description.sponsorshipPublic Utilities Board (PUB)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleDesign and development of layer-by-layer based low-pressure antifouling nanofiltration membrane used for water reclamationen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.description.versionAccepted versionen_US
dc.description.acknowledgementThis research grant was supported by the Singapore National Research Foundation under its Environment and Water Research Program and administered by PUB, Singapore’s National Water Agency. The Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University is supported by the Economic Development Board - Singapore.en_US
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