Xi'an University of Architecture and Technology, Xi'an, China.
Water Sci Technol. 2012;66(10):2074-82. doi: 10.2166/wst.2012.380.
Mixtures of polyvinylidene fluoride (PVDF) and polyvinyl alcohol (PVA) containing hydrophilic ultrafiltration membranes were prepared by adding PVA (5 to 30%) to PVDF by the phase inversion method. The hydrophilic contact angle (CA), equilibrium water content, pure water flux and bovine serum albumin retention were studied to assess the membrane performance. The anti-fouling performance of modified membrane to the secondary treated water was evaluated by flux decline, washing recovery rate and fouling resistance analysis. Scanning electron microscopy showed that the cross-section structure of the membranes had finger-like pores, which were well developed and uniformly distributed, and the sub-layer structure was looser and more porous with the increasing content of PVA. The CA gradually decreased. The steady flux was 800 L/m(2) h from P15 to P30, and the BSA retention sharply declined. The ultrafiltration tests for secondary treated water indicated that the main fouling source of the modified membrane was the concentration polarization and cake layer resistance. After physical flushing, the flux recovery ratio of the membrane could reach 100% when the PVA content was 5-15%, which shows excellent anti-pollution performance and good prospects for use in processing wastewater from urban sewage.
聚偏氟乙烯（PVDF）和聚乙烯醇（PVA）的混合物含有亲水性超滤膜，通过将相转化法中 PVA（5-30%）添加到 PVDF 中来制备。通过研究亲水接触角（CA）、平衡水含量、纯水通量和牛血清白蛋白截留率来评估膜性能。通过通量下降、清洗恢复率和污垢阻力分析来评估改性膜对二级处理水的抗污染性能。扫描电子显微镜显示，膜的横截面结构具有指状孔，这些孔发育良好且均匀分布，随着 PVA 含量的增加，亚层结构变得更疏松且多孔。CA 逐渐降低。从 P15 到 P30，稳定通量为 800 L/m²h，BSA 保留率急剧下降。对二级处理水的超滤测试表明，改性膜的主要污染来源是浓差极化和滤饼层阻力。经过物理冲洗，当 PVA 含量为 5-15%时，膜的通量恢复率可达 100%，这表明其具有优异的抗污染性能，在处理城市污水废水方面有很好的应用前景。
