In-situ electrochemical cleaning of carbon nanotube conductive membrane in alleviating membrane fouling
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.
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万方数据
维普
