关键词: 多通道陶瓷膜, 催化, 膜污染, 腐植酸, 超滤, 氧化

Abstract: In order to investigate the effects of photocatalysis on membrane fouling behaviors using hybrid process of photocatalysis and multichannel ceramic ultrafiltration membrane for removal of humic acid from water,the membrane flux variations,pollutant removal rates,membrane fouling models and membrane fouling resistances under different photocatalyst concentrations were discussed. The backwash effects on membrane flux variations were also observed. The results showed that the photocatalysis could effectively improve the steady permeate fluxes and removal rates of pollutants. As the catalyst concentration was 0.4g/L,the relative membrane flux reached the lowest value of 58.6%. As the catalyst concentration was 0.6g/L,the pollutants removal rates gained the highest level,in which the DOC,UV₂₅₄ and UV₄₃₆ reached 76.5%,87.3% and 96.8%, respectively. In the hybrid process of photocatalysis and ceramic membrane,the membrane fouling firstly underwent a short time of membrane pore blocking and transition stage,and then were mainly controlled by the deposition of pollutants on the membrane surface. The photocatalysis can significantly reduce the total and reversible membrane fouling resistances. Under the photocatalysis, although on-line backwashing had less effect on membrane flux recovery,its membrane fluxes also decreased limitedly prior to every backwashing. Therefore,in the periodic on-line backwashing process,the overall running range of the membrane flux under the photocatalysis was much higher than that of the situation without using photocatalysis.

Key words: multichannel ceramic membranes, catalysis, membrane fouling, humic acid, ultrafiltration, oxidation