Fulvic acid removal by nanoparticle TiO2 using a submerged membrane photocatalysis reactor

FU Jian-feng , JI Min , AN Ding-nian


Received February 28, 2005,Revised April 14, 2005, Accepted , Available online

Volume 17,2005,Pages 942-945

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The degradation of fulvic acid(FA) by nanoparticle TiO2 in a submerged membrane photocatalysis(SMPC) reactor was stidoed. In this reactor, photocatalytic oxidation and membrane separation co-occured. The continuous air supply provided O2 for the photocatalytical reaction and mixed the solution through an airflow controller. The particle TiO2 could automatically settle due to gravity without particle agglomeration so it could be easily separated by microfiltration(MF) membrane. It was efficient to maintain high flux of membranes. The effects of operational parameters on the photocatalytic oxidation rate of FA were investigated. Results indicated that photocatalyst at 0.5 g/L and airflow at 0.06 m3/h were the optimum condition for the removal of fulvic acid, the removal efficiency was higher at acid media than that at alkaline media. The effects of different filtration duration on permeate flux rate of MF with P25 powder and with nanoparticle TiO2 were compared. Experimental results indicated that the permeate flux rate of MF was improved and the membrane fouling phenomenon was reduced with the addition of nanoparticle TiO2 catalyst compared with conventional P25 powder. Therefore, this submerged membrane photocatalysis reactor can faciliate potential application of photocatalytic oxidation process in drinking water treatment.

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