汲取液溶质反向扩散与正渗透中膜污染的相互关系研究

doi:10.16088/j.issn.1001-6600.2024052903

广西师范大学学报（自然科学版） ›› 2024, Vol. 42 ›› Issue (6): 30-39.doi: 10.16088/j.issn.1001-6600.2024052903

汲取液溶质反向扩散与正渗透中膜污染的相互关系研究

翟思琪^1,2,3, 蔡文君^1,2,3, 朱苏^1,2,3, 李韩龙^1,2,3, 宋海亮^1,2,3, 杨小丽⁴, 杨玉立^1,2,3*

1.南京师范大学环境学院,江苏南京 210023;
2.江苏省环境风险防范与应急技术工程研究中心(南京师范大学),江苏南京 210023;
3.江苏省水土生态修复工程实验室(南京师范大学),江苏南京 210023;
4.东南大学土木工程学院,江苏南京 211189

收稿日期:2024-05-29 修回日期:2024-07-01 出版日期:2024-12-30 发布日期:2024-12-30
通讯作者: 杨玉立(1989—),女,江苏盐城人,南京师范大学副教授,博士。E-mail: ylyang@njnu.edu.cn
基金资助:
江苏省生态与环境厅研究项目(2022005);国家自然科学基金(51908292)

Dynamic Relationship Between Reverse Solute Flux and Membrane Fouling in Forward Osmosis

ZHAI Siqi^1,2,3, CAI Wenjun^1,2,3, ZHU Su^1,2,3, LI Hanlong^1,2,3, SONG Hailiang^1,2,3, YANG Xiaoli⁴, YANG Yuli^1,2,3*

1. School of Environment, Nanjing Normal University, Nanjing Jiangsu 210023, China;
2. Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology (Nanjing Normal University), Nanjing Jiangsu 210023, China;
3. Jiangsu Engineering Lab of Water and Soil Eco-Remediation (Nanjing Normal University), Nanjing Jiangsu 210023, China;
4. School of Civil Engineering, Southeast University, Nanjing Jiangsu 211189, China

Received:2024-05-29 Revised:2024-07-01 Online:2024-12-30 Published:2024-12-30

摘要/Abstract

摘要： 为探究典型无机汲取液的溶质反向扩散(RSF)与膜污染的动态影响关系,从而在实际应用中缓解膜污染问题。本研究选取5种无机汲取液(NaCl、NaHCO₃、NaH₂PO₄、NH₄Cl、CaCl₂)过滤有机污染物,通过考察系统的渗透性能,表征膜污染层和原料液特性,探究RSF和膜污染间的双向影响。一方面,反向扩散的离子直接与膜污染层结合,如Ca²⁺易与海藻酸钠交联形成三维网状结构;另一方面,膜污染层抑制Ca²⁺的反向扩散量(5.8±1.6 mmol·m^-2·h^-1),促进NH⁺₄的反向扩散量(129.2±12.8 mmol·m^-2·h^-1),因此,以NH₄Cl为汲取液时水回收量(151.4±10.6 g)低于以CaCl₂为汲取液时的水回收量(246.4±124.7 g)。此外,RSF改变原料液的性质(Zeta电位、粒径大小等),从而影响膜污染程度。汲取液类型影响膜污染层与RSF间的动态平衡关系,影响系统运行性能。

关键词: 正渗透, 膜污染, 溶质反向扩散, 汲取液, 动态影响

Abstract: Membrane fouling poses a limitation to the application of forward osmosis (FO), and reverse solute flux (RSF) from the draw solutes further reduces the permeability of the membrane. Therefore, this study investigated the dynamic relationship between reverse solute flux and organic membrane fouling using typical inorganic draw solutions (DSs)(NaCl,NaHCO₃,NaH₂PO₄,NH₄Cl,CaCl₂). On one hand, the reverse solute flux directly interacted with the membrane fouling layer, affecting its configuration. For example, the reverse flux of Ca²⁺ from CaCl₂ draw solute readily crosslinked with sodium alginate (SA), forming a three-dimensional network structure that exacerbated membrane fouling. On the other hand, the formation of membrane fouling reduced the reverse flux of Ca²⁺ from CaCl₂ draw solute (5.8±1.6 mmol·m^-2·h^-1) while increasing the reverse diffusion of NH⁺₄ from NH₄Cl draw solution (129.2±12.8 mmol·m^-2·h^-1). Consequently, the water recovery using NH₄Cl as the draw solute (151.4±10.6 g) was lower than that using CaCl₂ (246.4±124.7 g). Furthermore, reverse solute flux altered the properties of the feed solute, leading to the dominance of different filtration mechanisms in the formation of membrane fouling, which subsequently impacts the degree of fouling.

Key words: forward osmosis, membrane fouling, reverse solute flux, draw solute, dynamic relationship

中图分类号: X52

翟思琪, 蔡文君, 朱苏, 李韩龙, 宋海亮, 杨小丽, 杨玉立. 汲取液溶质反向扩散与正渗透中膜污染的相互关系研究[J]. 广西师范大学学报（自然科学版）, 2024, 42(6): 30-39.

ZHAI Siqi, CAI Wenjun, ZHU Su, LI Hanlong, SONG Hailiang, YANG Xiaoli, YANG Yuli. Dynamic Relationship Between Reverse Solute Flux and Membrane Fouling in Forward Osmosis[J]. Journal of Guangxi Normal University(Natural Science Edition), 2024, 42(6): 30-39.

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汲取液溶质反向扩散与正渗透中膜污染的相互关系研究

Dynamic Relationship Between Reverse Solute Flux and Membrane Fouling in Forward Osmosis

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