ZHANGRui-jun,FENGXiao-lin,XIAOFeng,et al.Optimization of Chemical Cleaning Protocol for Ultrafiltration Membrane Maintenance in a Water Purification Plant in Tianjin[J].China Water & Wastewater,2025,41(19):8-15.
天津市某净水厂超滤膜维护性化学清洗方案优化
- Title:
- Optimization of Chemical Cleaning Protocol for Ultrafiltration Membrane Maintenance in a Water Purification Plant in Tianjin
- Keywords:
- ultrafiltration; membrane fouling; chemical cleaning; transmembrane pressure recovery rate
- 摘要:
- 针对天津市某净水厂超滤膜维护性化学清洗方案清洗效果不佳的问题，对现行维护性化学清洗方案中的药剂接触方式、清洗时间、药剂浓度、清洗顺序等进行了研究，考察对跨膜压差恢复率的影响，同时采用扫描电子显微镜（SEM）和衰减全反射傅里叶变换红外光谱仪（ATR-FTIR）对原膜、受污染膜及清洗后的超滤膜表面形貌及官能团进行微观表征。结果表明，膜表面主要污染物为腐殖质类、蛋白质类和多糖类等有机物，先后采用450 mg/L的次氯酸钠和500 mg/L的柠檬酸作为清洗剂进行两次循环清洗，并且当每次清洗循环时间为等压循环10 min+错流循环40 min+浸泡10 min时，清洗效果更好，跨膜压差恢复率能够由原来的31.6%提高至91.9%。进一步提出在上述清洗方案的第一次循环中添加100 mg/L的氯化钠用于强化清洗效果，发现跨膜压差恢复率可以提高至94.7%。
- Abstract:
- This study systematically investigated key parameters including the contact mode of cleaning agents, cleaning duration, chemical concentration, and cleaning sequence, focusing on their impact on the recovery rate of transmembrane pressure, and analyzed the surface morphology and functional group composition of the original membrane, fouled membrane, and cleaned membrane using scanning electron microscopy (SEM) and attenuated total reflectance Fourier?transform infrared spectroscopy (ATR-FTIR), so as to address the issue of the unsatisfactory cleaning performance of the current maintenance chemical cleaning protocol for ultrafiltration membranes at a water purification plant in Tianjin. The primary foulants on the membrane surface included organic matters such as humic substances, proteins, and polysaccharides. Two consecutive cleaning cycles were performed using 450 mg/L sodium hypochlorite followed by 500 mg/L citric acid as cleaning agents. Each cleaning cycle consisted of 10 minutes of isobaric circulation, 40 minutes of cross-flow circulation, and 10 minutes of immersion. Under this cleaning protocol, a significantly improved cleaning performance was achieved, with the transmembrane pressure recovery rate increasing from the initial 31.6% to 91.9%. It was further proposed to incorporate 100 mg/L of sodium chloride into the first cycle of the aforementioned cleaning protocol with the aim of enhancing the cleaning efficiency. The results indicated that this modification increased the transmembrane pressure recovery rate to 94.7%.
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