织布支撑PVDF—纳米TiO2共混膜在MBR中抗污染性能研究

在室温25℃、压力50 kPa条件下,将尼龙织布作为支撑层,以聚偏氟乙烯(PVDF)和N,N-二甲基乙酰胺(DMAc)为主要原料制备PVDF膜,并在体系中添加2种不同含量的纳米TiO2制备PVDF-TiO2共混膜,其纯水通量分别为4 892、3 752、2 437 L.m-.2h-1。通过膜生物反应器中膜阻力的测定,表明膜污染主要由沉积层引起。在MBR中运行时,3种膜的膜通量衰减速率分别为0.112 3、0.089 0、0.075 9,纳米TiO2含量高的PVDF-TiO2膜通量衰减最慢、抗污染性最好、膜截留作用最高。

STUDY ON ANTI-FOULING PERFORMANCE OF PVDF-TIO2 NANO BLENDING MEMBRANE SUPPORTED BY NYLON FABRIC IN MBR

As a support layer of polyester fabric,Polyvinylidene fluoride(PVDF) membrane was prepared with PVDF and dimethylacetamide(DMAc).And two kinds of different concentrations of TiO2 Nano was added into the system to prepare PVDF-TiO2 blending membrane under the operational conditions of 25 ℃ and 50 kPa.The water flux of these membranes were about 4 892,3 752,2 437 L·m-2·h-1 respectively.According to results of membrane resistance determination in a membrane bioreactor,it was found that membrane fouling was mainly attributed to concentration polarization layer and gel layer.In MBR the decay rates of membrane flux of PVDF membrane,PVDF-TiO2 blending membrane were about 0.112 3,0.089 0,0.0759 respectively,the PVDF-TiO2 blending membrane contains the higher concentration of TiO2 performs best for it owns slowest membrane flux decrease rate,best anti-fouling performance and highest membrane rejection effect.