ZHANG Juan,NIU Yu-hai,ZHANG Zi-li,et al.Operational Efficiency of Short-flow Ultrafiltration Process Treating Water from South-to-North Water Diversion Project[J].China Water & Wastewater,2020,36(23):37-41.
超滤膜短流程工艺处理南水北调原水的运行效能
- Title:
- Operational Efficiency of Short-flow Ultrafiltration Process Treating Water from South-to-North Water Diversion Project
- Keywords:
- water from South-to-North Water Diversion Project; UF membrane; short-flow process; water purification efficiency; chemical cleaning; transmembrane pressure (TMP)
- 摘要:
- 采用超滤膜短流程工艺处理南水北调原水，分析了超滤膜的净水效能以及膜污染情况。从出水水质分析结果可知，无论原水及膜池进水浊度如何变化，出水浊度始终稳定维持在0.1 NTU左右，出水浊度合格率为100%；出水CODMn浓度稳定控制在2.0 mg/L以下，合格率为100%。超滤膜短流程工艺对大肠杆菌等致病微生物具有100%的去除效果，且去除效果稳定，出水水质能够达到《生活饮用水卫生标准》（GB 5749—2006）的要求。现场实际运行结果表明，膜丝在遭受严重污染时，膜通量的恢复、跨膜压差的下降需要一个较长的过程。通过调整清洗程序，膜污染得到缓解，跨膜压差维持在一个极低的范围，可实现膜系统“零污染”技术，而且此时系统运行状态良好，能耗低。
- Abstract:
- Short-flow ultrafiltration (UF) purification process was used to treat water from South-to-North Water Diversion Project, and water purification efficiency and membrane fouling were analyzed. According to the results of effluent quality, no matter how turbidity in the raw water and influent of the membrane changed, effluent turbidity maintained consistently at about 0.1 NTU and its qualification rate was up to 100%, and CODMn concentration in the effluent was always less than 2.0 mg/L and its qualification rate was also 100%. The process had 100% removal efficiency of almost all pathogenic microorganisms (such as Escherichia coli) and stable performance, and the effluent quality could meet Standards for Drinking Water Quality (GB 5749-2006). Results of field operation showed that it would take a long time to restore the membrane flux and reduce the transmembrane pressure (TMP) if the membrane was badly polluted. Membrane fouling was relieved and the TMP was maintained in a very low range by adjusting the washing procedure. Therefore, “zero-membrane fouling” technologies with good performance and low energy consumption could be realized.
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