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pH对海藻酸钠膜污染的影响及热力学分析

作者：姚凌翔，滕佳恒，林红军

单位：浙江师范大学地理与环境科学学院

关键词：超滤；膜污染；海藻酸钠； pH；热力学分析

DOI号： 10.16159/j.cnki.issn1007-8924.2025.01.004

分类号： TU991.24； X703

出版年,卷(期):页码： 2025,45(1):30-39

摘要：

滤膜技术以其操作简便和高效的分离能力，被认为是缓解全球水资源短缺问题的重要手段.然而，膜污染问题，尤其是由天然有机物（NOM）引起的膜污染，严重限制了该技术的广泛应用.为此，本研究选用海藻酸钠作为模型污染物，模拟了不同pH条件下的膜污染现象.死端过滤结果显示,当pH=3时，海藻酸钠的结垢现象最为严重，显著高于其他pH条件下的；随着pH升至7，膜污染显著减轻，比过滤阻力（SFR）下降了约77%.通过Zeta电位分析和接触角测定等方法表征了污染物的表面性质，并结合XDLVO理论进行界面热力学建模以深入探讨其潜在机制.结果发现，在不同pH环境下，污染物间的静电斥力以及污染物与膜之间的界面自由能变化是影响膜污染行为的关键.这些发现为深入理解膜污染问题提供了重要的理论支持，有望为膜污染控制策略的制定提供新的视角与思路.

?Ultrafiltration (UF) membranes are widely recognized for their ease of operation and efficient separation capabilities, positioning them as a crucial tool in addressing global water scarcity. However, membrane fouling, particularly that caused by natural organic matter (NOM), has significantly hampered the widespread application of this technology. For this purpose, in this study, sodium alginate was taken as the model pollutant to simulate the membrane fouling phenomenon under different pH conditions. The dead-end filtration results indicated that the sodium alginate solution had severe scaling at pH=3, which was significantly higher than that under other pH conditions. As the pH rose to 7, the membrane fouling was significantly mitigated, and the specific filtration resistance (SFR) decreased by approximately 77%. The surface properties of the foulants were characterized using Zeta potential analysis and contact angle measurement, and interfacial thermodynamic modeling was conducted with the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory to investigate the underlying mechanisms thoroughly. Results indicated that under different pH environments, electrostatic repulsion between foulants and changes in interfacial free energy between the foulants and the membrane were critical factors influencing fouling behavior. These findings provide important theoretical support for understanding membrane fouling phenomena and offer new perspectives and strategies for developing effective fouling control measures.

基金项目：

浙江省自然科学基金项目（LQ24E080017）

作者简介：

姚凌翔（1997-），男，浙江台州人，硕士生，从事膜污染机理、污水处理及资源化研究等.

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