Migration behavior of organic foulants toward anion exchange membrane under the electric field

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-05-11 DOI:10.1016/j.watres.2025.123809

Tiecheng Guo, Daliang Xu, Guibai Li, Xiaobin Tang, Heng Liang

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Abstract

Anion exchange membrane (AEM) fouling has sparked extensive research, especially on the interaction of foulants with the AEM. However, there is still a lack of clear explanation about how foulants migrate from feedwater to the AEM surface. This study systematically investigated the migration of foulants and influencing factors in electrodialysis (ED). The behavior of negatively charged foulants in ED was found to occur in three stages according to the variety of the rate of diluate conductivity change: blocking by boundary layer, approaching, and arriving at the AEM surface. The results revealed that the membrane was rarely fouled in the first stage, whereas the fouling level significantly increased in the second and stabilized in the third. A limiting conductivity was identified, marking the point where the fouling level began to rise, indicating the transition from the first to subsequent stages. The current value was found to be highly responsible for limiting conductivity (contribution >95 %). Based on that, an operation strategy with low energy consumption and high desalination efficiency was proposed by adjusting the current according to feed water conductivity. This study brings insights into completing the whole fouling behavior and developing anti-fouling strategies for AEM by mitigating foulants' migration, which increases ED desalination performance facing fouling.

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电场作用下有机污染物向阴离子交换膜的迁移行为

阴离子交换膜（AEM）污染引起了广泛的研究，特别是污染物与AEM的相互作用。然而，对于污水如何从给水迁移到AEM表面，目前还缺乏明确的解释。本研究系统地探讨了电渗析（ED）中杂质的迁移及其影响因素。根据稀释电导率变化的不同，发现带负电荷的杂质在电场中的行为可分为三个阶段：被边界层阻挡、接近和到达电场表面。结果表明，膜在第一阶段很少受到污染，而在第二阶段污染程度显著增加，在第三阶段污染程度趋于稳定。发现了一个极限电导率，标志着污垢水平开始上升的点，表明从第一阶段到后续阶段的过渡。发现电流值对限制电导率有很大的影响（贡献>；95%）。在此基础上，提出了一种根据进水电导率调节电流的低能耗、高脱盐效率的运行策略。该研究有助于通过减少污染物的迁移来完善AEM的整体污染行为和制定抗污染策略，从而提高ED在污染情况下的脱盐性能。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.