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    Seawater pretreatment with an NF-like forward osmotic membrane: Membrane preparation, characterization and performance comparison with RO-like membranes

    Year: 2019

    Journal: Desalination, Volume 470, NOV 15

    Authors: Yao, Zhikan; Peng, Lu Elfa; Guo, Hao; Qing, Weihua; Mei, Ying; Tang, Chuyang Y.

    Organizations: Research Grants Council of the Hong Kong Special Administration Region, ChinaHong Kong Research Grants Council [C7051-17G]; Fundamental Research Funds for the Central Universities, ChinaFundamental Research Funds for the Central Universities [2019QNA4048]

    Keywords: Nanofiltration-like forward osmosis; Reverse osmotic-like forward osmotic; Desalination pretreatment; Interfacial polymerization

    A nanofiltration-like (NF-like) forward osmosis (FO) membrane was prepared by interfacial polymerization and applied for seawater pretreatment. The prepared NF-like FO membrane shows much higher water permeability and higher divalent salt to monovalent salt selectivity compared to a commercial reverse-osmotic-like (RO-like) FO membrane. The comparison between NF-like FO membrane and RO-like FO membrane in FO process was systematically investigated by using an antiscalent (sodium polyacrylate, PAANa) solution as draw solution. Both NF-like and RO-like FO process showed high rejection of alginate and sulfate. However, the water flux and monovalent salt (NaCl) passage in NF-like FO process were much higher, which enables the NF-like FO membrane to be a better candidate for pretreating seawater. The findings provide new insights on the design and preparation of FO membranes for seawater pretreatment.
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