聚乙烯醇微球预涂动态膜的制备及表征

为了提高微滤膜的抗污染性和降低膜组件的价格，利用循环预涂工艺制备出新型聚乙烯醇微球预涂动态膜（PVA-MS/PCDMs）.对不同聚乙烯醇微球预涂量的动态膜进行了系统表征，结果显示，PVA-MS/PCDMs的清水过滤阻力介于0.64×10¹⁰～3.84×10¹⁰ m^-1, 渗透性良好；当预涂量≥23.9 g·m^－２时，可达到微滤分离水平；亲水性随预涂量的增加而增强，动态接触角由基膜的118.25°降低到预涂量为61.9 g·m^－２时的61.52°；利用流动电位法在20℃，pH为8.0±0.2，0.01 mol·Ｌ^－１　KCl溶液的测试条件下，测得当预涂量为15.7 g·m^－２时膜面相对Zeta电位值可达-36.4　mV.并且，通过PVA-MS/PCDMs在SMBR中的短期通量衰减变化（恒压）和对EPS的扩散实验发现，预涂量为23.9～61.9 g·m^－２时，增加了对EPS的扩散渗透性能，且膜通量衰减趋于稳定时仍为基膜的3.5～4.8倍，即提高了抗污染性.

Preparation and Characterization of Polyvinyl Alcohol Microsphere Pre-coated Dynamic Membranes

To alleviate membrane fouling and reduce the price of membrane module,polyvinyl alcohol microsphere pre-coated dynamic membranes (PVA-MS/PCDMs) were investigated detailedly. It was prepared when the polyvinyl alcohol microsphere of the pre-coated reagent deposited on the surface and entered the pores of porous substrate common filter cloth which was low-cost by means of circulatory filtration. The morphology and structure of PVA-MS/PCDMs were examined using scanning electron microscope (SEM),and approximate...