碳纳米管导电膜原位电化学清洗缓解膜污染研究
In-situ electrochemical cleaning of carbon nanotube conductive membrane in alleviating membrane fouling
王凌雪 1于童 1王子维 1杨英杰 1李苹 1施雪卿1
作者信息
- 1. 青岛理工大学 环境与市政工程学院,青岛 266525
- 折叠
摘要
应用周期性电化学清洗方法,系统评价电化学清洗缓解超滤膜有机、生物及有机/生物混合污染的效果及作用机理.采用真空抽滤方式制备碳纳米管(CNT)-聚四氟乙烯(PTFE)导电膜,研究电化学清洗对缓解海藻酸钠(SA)、铜绿假单胞菌(PA)及两者混合污染后标准化膜通量恢复效果.结果表明,经SA、PA及两者混合污染后,标准化膜通量均迅速下降,而电化学清洗通过直接氧化与间接氧化相结合的方式,使标准化膜通量分别恢复至初始通量的 99%、74%和 94%.此外,在 3 V电压下持续电化学清洗 3 min,截留在膜面的活细菌从 6×106 CFU/cm2 降低为 6 CFU/cm2,去除率达到 6 log.
Abstract
In this study,periodic electrochemical cleaning was applied to systematically eval-uate the effect and mechanism of electrochemical cleaning in alleviating organic,biological and mixed fouling of ultrafiltration membranes.Carbon nanotube(CNT)-polytetrafluoro-ethylene(PTFE)conductive membrane was prepared by vacuum filtration,and the effect of electrochemical cleaning on alleviating the fouling of sodium alginate(SA),Pseudomonas aeruginosa(PA)and the mixed fouling was assessed.The results indicated that the mem-brane flux decreased rapidly after SA,PA and mixed fouling,but then restored to 99％,74％and 94％of the initial flux respectively after the electrochemical cleaning which com-bined direct oxidation and indirect oxidation.Additionally,the living bacteria trapped on the membrane surface were reduced from 6×106 CFU/cm2 to 6 CFU/cm2,and the removal effi-ciency reached 6 log by continuous electrochemical cleaning with an applied voltage of 3 V for 3 minutes.
关键词
电化学清洗/碳纳米管/导电膜/膜污染Key words
electrochemical cleaning/carbon nanotube/conductive membrane/membrane fouling引用本文复制引用
基金项目
中国博士后科学基金面上资助项目(2019M652347)
青岛市博士后研究人员应用研究项目()
出版年
2024
NETL
NSTL
维普
万方数据