应用于维生素C凝结水处理反渗透膜清洗策略

针对沈阳某药厂维生素C生产工艺中凝结水产量大、处理成本高和杂质复杂等问题,提出了采用反渗透技术对工艺凝结水进行处理。在前期确定的最优操作条件基础上持续运行,研究了运行临界通量、清洗时机和清洗方式等工艺条件。结果表明,在本工艺条件下,反渗透膜系统的临界通量介于1.1 L/(m2.min)到1.2 L/(m2.min)之间,斜率变点分析法确定的可逆膜污染周期为10 d;加强型清洗策略EFM(enhanced flux maintenance)的操作是针对不可逆膜污染的一种有效清洗方式,EFM持续30 min为宜,NaClO和NaOH都是有机污染的有效清洗剂,膜的平均恢复率分别为85.4%和81.6%,显示出实际应用的可行性,具有推广价值。

Cleaning strategy of reverse osmosis membrane for treating C condensate

Regarding to the problem in vitamin C condensation water production process,such as its large amount,complex impurities and high treatment cost,the reverse osmosis advanced technology for purifying the said water was put forward accordingly herein. On the basis of early certified optimal operating conditions,conditions of the critical flux,cleaning time and cleaning methods were studied. The results showed the critical flux of reverse osmosis membrane system were in the zone from 1.1 L/(m²·min) to 1.2 L/(m²·min),and the reversible membrane fouling cycle time determined by the slope change point analysis method was 10 d; the enhanced flux maintenance (EFM) was an effective cleaning method for irreversible membrane fouling,the EFM for 30 minutes is appropriated,and the NaClO or NaOH were effective for cleaning agent of organic pollution, the average recovery rates of the RO membrane were 85.4% and 81.6%, respectively. It had showed the feasibility and practical application of the updated, and it is worthful to be popularized widely.