GUOSha-sha,XIEPeng,LITian-yu,et al.Investigation of Key Fouling Factors Affecting Nanofiltration Membranes in Advanced Water Treatment[J].China Water & Wastewater,2025,41(21):77-82.
给水深度处理中纳滤膜的关键污染因子研究
- Title:
- Investigation of Key Fouling Factors Affecting Nanofiltration Membranes in Advanced Water Treatment
- 摘要:
- 采用超低压纳滤膜对长江流域某自来水厂沉淀池出水进行深度处理中试，通过分析膜面污染物类型、膜污染阻力、动态膜污染过程等，采用SPSS软件对纳滤膜多周期运行数据与进水水质进行统计学相关性分析，得出纳滤膜运行过程的关键污染因子为铝以及钙、铝与有机物的复合物。铝因膜表面的负电性而极易吸附其上，并作为污染诱导因子与有机物、硅、钙形成络合架桥作用，导致纳滤膜的快速污染。铝主要来源于混凝工艺段的絮凝剂残留，调整进水pH在6.5~7.0范围可有效降低纳滤进水中的铝浓度。根据纳滤膜污染曲线分析和中试验证，当进水中铝浓度低于50 μg/L时，纳滤膜运行周期比进水中铝浓度为100~150 μg/L时延长1倍。
- Abstract:
- A pilot-scale study was conducted to evaluate the advanced treatment of effluent from a sedimentation tank at a water treatment plant in the Yangtze River Basin using ultra-low pressure nanofiltration (NF) membranes. The investigation focused on analyzing membrane surface foulants, membrane fouling resistance, and dynamic fouling behavior. Furthermore, a statistical correlation analysis was performed between multi-cycle NF membrane operation data and influent quality parameters using SPSS software. The results indicated that the key fouling factors during NF membrane operation were aluminum species and complexes composed of calcium, aluminum, and organic matters. Aluminum exhibited strong adsorption onto the membrane surface due to its positive charge and served as a key fouling induction factor by forming complex bridging interactions with organic matters, silica, and calcium ions, thereby accelerating the fouling of NF membranes. The primary source of aluminum was residual flocculant from the coagulation process. Adjusting the influent pH to 6.5-7.0 effectively reduced aluminum concentration in the influent of the nanofiltration system. Based on the analysis of the NF membrane fouling curve and pilot-scale experimental validation, when the influent aluminum concentration was below 50 μg/L, the operational cycle of the NF membrane was doubled compared to conditions with an influent aluminum concentration of 100-150 μg/L.
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