Concentration polarization and membrane fouling characteristics in ultrafiltration based on electrical impedance analysis: synergistic or translational?

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2025-04-17 DOI:10.1016/j.desal.2025.118922

Miao Guo , Hui Jia , Fei Gao , Jie Wang

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引用次数: 0

Abstract

In macromolecular ultrafiltration (UF) processes, the effects of concentration polarization (CP) and membrane fouling have been widely studied, while the impact of ion-induced CP is often overlooked. However, ion-induced CP plays a crucial role in UF systems which depends on water quality. In this study, electrochemical impedance spectroscopy (EIS) was used to monitor the membrane filtration process in real-time. Through the fitting circuit, the key parameters such as CP layer resistance (R_cp), cake layer resistance (R_f) and membrane layer resistance (R_m) were analyzed under different operating conditions. The contribution of non-ion concentration polarization (NICP), ion concentration polarization (ICP) and membrane fouling to the degradation of filtration performance can be determined by the change of different resistance values. The experimental results revealed two distinct stages in the UF process: a synergistic phase, during which NICP and membrane fouling occur simultaneously, followed by a transition to a fouling-dominated stage. In addition, ion-induced CP enhanced the synergistic interaction between NICP and membrane fouling, accelerating the transition to the fouling-dominated stage. Notably, the fouling type shifted from irreversible membrane pore plugging fouling to the more reversible cake layer fouling. Recognizing this transition in fouling behavior is crucial for optimizing membrane cleaning strategies. Furthermore, by optimizing the cleaning strategy based EIS, the study demonstrated a significant improvement in membrane flux, with the flux recovery rate increasing by 26.10 % to 30.69 %. This study highlights the value of EIS as an in-situ monitoring tool for distinguishing between CP types and fouling stages, and emphasizes the importance of ion-induced CP in UF systems. It provides a promising strategy for real-time performance assessment and cleaning optimization in ultrafiltration systems used in water treatment.

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基于电阻抗分析的超滤中的浓度极化和膜污垢特征：协同还是转化？

在大分子超滤（UF）过程中，浓度极化（CP）和膜污染的影响已经得到了广泛的研究，而离子诱导的CP的影响往往被忽视。然而，离子诱导CP在超滤系统中起着至关重要的作用，这取决于水质。在本研究中，电化学阻抗谱（EIS）用于实时监测膜过滤过程。通过拟合电路，分析了不同工况下CP层电阻（Rcp）、饼层电阻（Rf）和膜层电阻（Rm）等关键参数。非离子浓度极化（NICP）、离子浓度极化（ICP）和膜污染对过滤性能下降的贡献可以通过不同电阻值的变化来确定。实验结果揭示了超滤过程的两个不同阶段：协同阶段，NICP和膜污染同时发生，然后过渡到污染主导阶段。此外，离子诱导的CP增强了NICP与膜污染之间的协同相互作用，加速了向污染主导阶段的过渡。值得注意的是，污染类型从不可逆的膜孔堵塞污染转变为更可逆的饼层污染。认识到污染行为的这种转变对于优化膜清洗策略至关重要。此外，通过优化基于EIS的清洗策略，研究表明膜通量显著提高，通量回收率提高26.10%至30.69%。本研究强调了EIS作为区分CP类型和污染阶段的原位监测工具的价值，并强调了离子诱导CP在超滤系统中的重要性。它为用于水处理的超滤系统的实时性能评估和清洗优化提供了一种有前途的策略。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.