关键词: 动态膜, 光催化, 氧化, 膜污染

Abstract: In order to solve the problem of peeling of the coated layer using physical disturbance models to control the dynamic membrane pollution,this paper presented photocatalysis coupled with dynamic membrane for mitigation of membrane fouling,and compared membrane permeate fluxes,pollutants removal and membrane fouling resistance distributions in ceramic microfiltration membrane,dynamic membrane and dynamic membrane/photocatalysis hybrid system in treatment of wastewater containing humic acid or humic acid/TiO₂. The results showed that the photocatalysis dynamic membrane effectively improved the steady permeate flux and removal rates of pollutants,and reduced the irreversible and reversible membrane fouling resistances. The reversible membrane fouling resistances and the main reason leading to the reduction of membrane permeate fluxes were obviously greater than the other parts of membrane resistances. With longer pretreatment by photocatalysis,the membrane permeate fluxes and removal rates of TOC and UV₂₅₄ were improved more significantly,thus the membrane fouling was more efficiently controlled. After 2 and 8 hours of photocatalysis pretreatment following by dynamic membrane filtration,the TOC removal rates were greater than 80% and 90%,respectively,and the UV₂₅₄ removal rates reached more than 95%.

Key words: dynamic membrane, photocatalysis, oxidation, membrane pollution