膜科学与技术

基于模型的纳滤型正渗透过程评估

作者：李卓，李圣哲，刘鑫，李炜怡

单位：南方科技大学环境科学与工程学院，深圳 518000

关键词：正渗透；纳滤型分离膜；模型评估；非线性回归

出版年,卷(期):页码： 2023,43(3):123-130

摘要：

纳滤型分离膜的发展为促进正渗透技术在水处理和生物（或有机物）产品分离提纯中的应用提供了新的动力。然而，能否将传统正渗透模型用于评估纳滤型正渗透分离膜及其分离过程尚存疑问。本研究利用层层自组装技术制备纳滤型分离膜，并使用多种多价盐作为汲取溶质实现正渗透过程。同时，本研究基于矢量分析建立适用于不同分离膜朝向的正渗透模型，并通过非线性拟合获得不同汲取溶质的膜内外传递系数和分离膜支撑层的结构参数。分析结果表明，传统正渗透模型在很大程度上适用于纳滤型分离膜过程的评估，能够为新型正渗透过程的工程设计和应用提供理论支撑。

Development of forward osmosis (FO) for water treatment and purifying/fractionating bioproducts or organics is gaining impetus from the use of nanofiltration (NF)-like membranes. However, it remains ambiguous whether the classical FO model is applicable to the assessment of NF-like membranes and the associated FO processes. Layer-by-Layer assembly was exploited by this study to fabricate NF-like membranes and thereby implement FO processes with various multivalent salts as the draw solute. Meanwhile, mathematical descriptions for the different membrane orientations were unified by retrieving the classical FO model in terms of vectorized variables; the nonlinear model was fitted to the experimental data in an effort to obtain the mass-transfer coefficients for various draw solutes on the membrane surface or within the membrane structures and the structural parameter characterizing the substrate. The analysis indicates that, to a great extent, the classical FO model can be extended to assessing NF-like FO processes, thereby providing a theoretical tool to develop design heuristics for engineering novel FO processes.

李卓（1996-），男，黑龙江双鸭山人，哈尔滨工业大学和南方科技大学联合培养硕士，研究方向为膜分离技术，E-mail：11749138@mail.sustech.edu.cn

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