LIUZhi-gang,CHENWei-jie,FEIJie,et al.Fouling Control Strategy for Submerged Ultrafiltration Membranes at T Waterworks in Zhejiang Province[J].China Water & Wastewater,2025,41(19):1-7.
浙江省T水厂浸没式超滤膜污染控制策略
- Title:
- Fouling Control Strategy for Submerged Ultrafiltration Membranes at T Waterworks in Zhejiang Province
- Keywords:
- waterworks; submerged ultrafiltration membrane; membrane fouling; physical cleaning; chemical cleaning; transmembrane pressure (TMP)
- 摘要:
- 膜污染是制约超滤技术工程应用的主要问题。以浙江省T水厂浸没式超滤膜（帘式、柱式）系统为研究对象，通过实验室小试、生产性试验和工程验证试验，系统分析了膜污染组分特征，并对物理、化学清洗策略进行优化。结果表明，膜污染主要有机组分为腐殖酸和蛋白质，无机组分则以Al、Si为主。基于物理清洗的生产性正交试验分析显示，帘式膜的跨膜压差（TMP）恢复率受气冲强度影响最大，柱式膜的TMP恢复率受混冲时间影响最大，而水冲强度对两膜混冲效果的贡献度最低；工程试验进一步证实，通过提高气冲强度并降低水冲强度，可在维持良好清洗效果的同时节省反冲洗水量约2 100 m3/d。化学清洗生产性试验和工程试验均表明，单一酸或碱清洗对膜污染的控制效果有限，而采用先NaClO+NaOH联合清洗（去除有机污染）再柠檬酸清洗（去除无机污染）的复合清洗策略在高污染情况下仍能有效恢复TMP。因此，应基于污染物成分制定差异化的清洗方案，从而提升膜污染控制效率。
- Abstract:
- Membrane fouling is the primary issue limiting the engineering application of ultrafiltration technology. This study focused on the submerged ultrafiltration membrane systems (curtain and column types) at the T waterworks in Zhejiang Province. Through laboratory bench-scale tests, pilot-scale tests, and full-scale validation trials, it systematically analyzed the characteristics of membrane foulants and optimized physical and chemical cleaning strategies. The results indicated that the main organic foulants were humic acids and proteins, while the primary inorganic foulants were Al and Si. Pilot-scale orthogonal experiments on physical cleaning showed that the transmembrane pressure (TMP) recovery rate of the curtain?fiber membrane was most significantly affected by air scouring intensity, whereas that of the columnar membrane was most affected by hybrid scouring duration; water scouring intensity contributed the least to the effectiveness of hybrid scouring for both membranes. Full-scale trials further confirmed that increasing air scouring intensity while decreasing water scouring intensity could save approximately 2 100 m3/d of backwash water while maintaining good cleaning efficacy. Both pilot-scale and full-scale chemical cleaning trials demonstrated that single acid or alkali cleaning had limited effectiveness in controlling membrane fouling. However, a composite cleaning strategy—first using combined NaClO and NaOH cleaning (to remove organic foulants) followed by secondary citric acid cleaning (to remove inorganic foulants)—effectively restored TMP even under severe fouling conditions. Therefore, differentiated cleaning plans should be developed based on the composition of foulants to improve the efficiency of membrane fouling control.
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