LiuYanqiu,LinXiaochuan,ZhangHanwu,et al.Efficiency of Dual-membrane Pilot System in Treating River Source Water under Different Pretreatment Processes[J].China Water & Wastewater,2026,42(17):26-33.
不同前置工艺下双膜中试系统处理河道源水的效能
- Title:
- Efficiency of Dual-membrane Pilot System in Treating River Source Water under Different Pretreatment Processes
- Keywords:
- ultrafiltration; nanofiltration; river source water; pretreatment process; membrane fouling
- 摘要:
- 针对常规工艺处理河道源水时对溶解性有机物及无机盐去除有限的问题，构建超滤-纳滤双膜中试系统，考察前置工艺对其深度处理效能的影响。以试验水厂沉淀、砂滤及臭氧/生物活性炭三种工艺的出水作为双膜进水，对比了其对浊度、高锰酸盐指数、总硬度及多种离子的去除效果，并分析了跨膜压差与膜通量的变化规律。结果表明，超滤能稳定控制出水浊度低于0.4 NTU；纳滤对高锰酸盐指数的平均去除率超过60%，对SO42-的截留率高于80%，对Ca2+、Mg2+的截留率均约为35%，但对一价离子（Na+、Cl-等）的截留率普遍低于30%。膜污染分析显示，以该水厂臭氧/生物活性炭为前处理时，超滤和纳滤的跨膜压差增长最缓慢，膜污染速率最低，系统运行最稳定。因此，考虑该水厂原水水质条件，将臭氧/生物活性炭作为双膜的前置工艺，可有效优化超滤进水水质，提升膜系统整体处理效能与运行经济性。
- Abstract:
- In view of the limited removal efficiency of dissolved organic matter and inorganic salts in conventional processes when treating river source water，an ultrafiltration-nanofiltration(UF-NF) dual-membrane pilot system was constructed to investigate the impact of pretreatment processes on its advanced treatment performance. The effluent from three processes of sedimentation, sand filtration and ozone-biological activated carbon(O3/BAC) was used as the feed water of the UF-NF dual-membrane system. The removal effects on turbidity, permanganate index, total hardness and various ions were compared, and the variation laws of transmembrane pressure (TMP) and membrane flux were analyzed. The results showed that UF could stably control the effluent turbidity below 0.4 NTU. The average removal rate of permanganate index by NF exceeded 60%, the retention rate of SO42- was higher than 80%, the retention rate of Ca2+ and Mg2+ was 35%, but the retention rate of monovalent ions (such as Na+ and Cl-) was generally below 30%. Membrane fouling analysis showed that when O3/BAC was used as the pretreatment, both the TMP growth and the membrane fouling rate of UF and NF were the slowest, and the system operation was the most stable. Therefore, using O3/BAC as a pretreatment process for the dual- membrane system can effectively optimize the influent water quality, enhance the overall treatment efficiency and operational economy of the system.
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