建立新型膜清洗装置，将压缩空气和化学清洗液形成气液两相混合流体对2.5英寸卷式反渗透膜进行清洗研究。系统地探讨了气液两相流清洗过程中清洗液流量、气体流速、气液比、清洗时间对膜截留率和通量恢复率的影响。结果表明清洗液在0.12 L•min-1时，即可获得较好的膜通量恢复率。不同过滤面积的反渗透膜，清洗液的临界流量不同，超过该流量对膜通量恢复率无明显影响。膜通量恢复率随气体流速的增加而增加，聚酰胺材质反渗透膜气速上限是18 m•s-1，更高的气速将降低膜截留率。气液比在2000:1~3000:1范围内能有效提高膜通量恢复率。两相流清洗时间一般不超过15 min就能获得理想清洗效果。

A novel membrane cleaning apparatus was constructed and used to study the cleaning of 2.5-inch spiral RO membrane with gas-liquid two-phase flow process. The two-phase flow mixture was formed by cleaning liquid mixed with compressed air. The effect of cleaning liquid flow rate, air velocity, gas to liquid ratio and cleaning time of gas-liquid two-phase flow process on rejection rate and flux recovery ratio (FRR) of RO membrane was investigated systematically. The results showed that high FRR was achieved by relatively low cleaning liquid flow rate about 0.12L•min-1. RO membranes with different active areas had different cleaning critical flow rates. Above the critical flow rate, FRR increased slowly. FRR increased with increasing air velocity. For polyamide composite RO membrane, the upper limit of air velocity was 18 m•s-1 and higher air velocity would decrease rejection rate of membrane. FRR was effectively improved when the gas to liquid ratio was from 2000:1 to 3000:1. The two-phase flow process was validated for cleaning 2.5-inch RO membranes effectively using a short 15-minute cycle.

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