葡萄糖酸盐用作正向渗透汲取液的应用研究
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摘要
正向渗透是近年新兴的膜分离技术,具有低能耗、低污染、高回收等特点,其应用受到极大的关注。汲取液是决定正向渗透过程驱动力的主要因素,也是正向渗透技术的核心问题。文章采用可再生的葡萄糖酸盐作汲取液,将其应用于正向渗透分离过程,相对于氯化钠作为汲取液时,取得了相当的水通量和较低的盐通量。其中以葡萄糖酸钾和葡萄糖酸钠为汲取液的性能更为优越。该项研究有望用于食品加工如果汁浓缩中,从而达到保护果汁中维生素及节能减排的目的。
Forward osmosis membrane separation is an emerging membrane-based separation technology in recent years, which has drawn great attention for its low energy power consumption and high recovery characteristics. In FO process the draw solute is the critical factor in FO process which determines the driving force in FO. Renewable gluconate salts are employed as draw solutes in this work. As compared with those conventional draw solutes(such as sodium chloride solution), FO results find that with gluconate salts as draw solute, the salt flux could be reduced significantly without sacrificing water flux, especially the FO performance with potassium gluconate and sodium gluconate. Among them, potassium gluconate and sodium gluconate are particularly significant. Gluconate salts are expected to be used in the food processing field via FO process(such as fruit juice concentration) for vitamin protection and energy saving.
Forward osmosis membrane separation is an emerging membrane-based separation technology in recent years, which has drawn great attention for its low energy power consumption and high recovery characteristics. In FO process the draw solute is the critical factor in FO process which determines the driving force in FO. Renewable gluconate salts are employed as draw solutes in this work. As compared with those conventional draw solutes(such as sodium chloride solution), FO results find that with gluconate salts as draw solute, the salt flux could be reduced significantly without sacrificing water flux, especially the FO performance with potassium gluconate and sodium gluconate. Among them, potassium gluconate and sodium gluconate are particularly significant. Gluconate salts are expected to be used in the food processing field via FO process(such as fruit juice concentration) for vitamin protection and energy saving.
引文
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[4]Ling M M,Wang K Y,Chung T S.Highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis for water reuse[J].Industrial&Engineering Chemistry Research,2010,49(12):5869-5876.
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[2]Chekli L,Phuntsho S,Shon H K,et al.A review of draw solutes in forward osmosis process and their use in modern applications[J].Desalination and Water Treatment,2012,43(1-3):167-184.
[3]Mc Cutcheon J R,Mc Ginnis R L,Elimelech M.Desalination by ammonia–carbon dioxide forward osmosis:influence of draw and feed solution concentrations on process performance[J].Journal of Membrane Science,2006,278(1):114-123.
[4]Ling M M,Wang K Y,Chung T S.Highly water-soluble magnetic nanoparticles as novel draw solutes in forward osmosis for water reuse[J].Industrial&Engineering Chemistry Research,2010,49(12):5869-5876.
[5]Ng H Y,et al.Treatment of RO brine-towards sustainable water reclamation practice,Water Sci Technol,2008,(58):931-93.