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Cleaning properties of spiral reverse osmosis membrane with gas-liquid two-phase flow process

Authors： GUO Zhujie，WANG Shu*，Meng Tao, Wang Jiao

Units： School of Life Science and Engineering， Southwest Jiaotong University， Chengdu 610031， China

KeyWords： gas-liquid two-phase flow; membrane cleaning; spiral RO membrane; rejection rate; flux recovery ratio; air velocity；gas to liquid ratio

ClassificationCode：TQ 028. 8

year,volume(issue):pagination： 2011,31(6):73-77

Abstract：

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.

Funds：

国家自然科学基金资助项目（20706046）

AuthorIntro：

郭竹洁(1986-), 女, 山西省长治市，硕士研究生, 西南交通大学生命科学与工程学院, 从事膜分离研究. * 通讯联系人〈wone_su@163.com〉

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