【摘要】 针对再生纤维造纸废水连续超滤处理中的膜污染问题,采用剪切力辅助膜清洗,同时分别测试了不同清洗剂(水、化学试剂)对经一次充分使用后的污染膜清洗性能的影响,并利用设计的正交实验方法优化了清洗工艺。对清洗前后的膜进行表征,发现在适当的剪切力辅助下,利用次氯酸钠清洗可以有效去除沉积在膜表面的有机污染物,通量回收率(FRR)在78%以上,膜表面接触角从69°提高到58°,化学清洗条件下的再生膜的亲水性显著提高,同时对膜结构的损伤较小,表明该方法是一种高效、温和的清洗方法。更多还原

【Abstract】 Based on the membrane fouling problem in Fenton-ultrafiltration treatment for recycled fiber papermaking wastewater, membrane cleaning assisted by shear force was carried out, meanwhile, the effects of different cleaning agents(water and chemical reagents) on the cleaning performance of contaminated membranes were tested, and the cleaning process was optimized by analyzing the results of designed orthogonal experiments. After characterization of the membrane surface before and after cleaning, it was found that sodium hypochlorite cleaning with appropriate shear force assisted can effectively remove organic pollutants deposited on the regenerated membrane surface with flux recovery rate(FRR) over 78%,and improve the hydrophilicity of the membrane surface with contact angle from 69° to 58°,at the same time, there was few damage on membrane structure, which showed that it was an efficient and mild cleaning method.更多还原