双层刮膜法制备的微孔膜应用于悬浮液澄清的研究  

Application of microfiltration membranes prepared via co-casting in clarification of suspended solution

作　　者：张云燕[1] 季瑜[1] 隋波 李雪梅[1] 殷勇[1] 王周为[1] 何涛[1] 

机构地区：[1]材料化学工程国家重点实验室,南京工业大学化学与化工学院,南京210009 [2]烟台万化氯碱公司,烟台264002

出　　处：《膜科学与技术》2010年第6期85-92,共8页Membrane Science and Technology

基　　金：国家重大基础研究“973”项目(2009CB623402);材料化学工程国家重点实验室基金(38901120);国家自然科学基金资助项目(20976083)

摘　　要：将双层刮膜法制备的具有高开孔率表面的微孔膜应用于过滤高浓度悬浮液体.研究了悬浮液颗粒浓度、粒径大小、膜的初始纯水通量、膜的正反面以及过滤方式几个方面对膜过滤性能的影响.结果表明,膜的初始纯水通量对颗粒的截留率和过滤通量的稳定性几乎没有影响;在一定的误差范围内,悬浮物的浓度对膜的稳定通透性能起着决定性的作用;颗粒粒径越大初始通量就越大.PSf膜的正面过滤初期通量没有底面过滤的大,但稳定通量始终高于底面过滤的稳定通量.PSf膜对啤酒的过滤效果优于PES膜,能过滤啤酒的最大质量Gmax是PES膜的4倍多,所以,具有高开孔率表面的PSf膜可以接纳更多的污染物质,具有较好的过滤性能.对于高浓度悬浮液的澄清来说,错流过滤的效率要高于死端过滤.This report described the application of microfiltration PSf membrane in clarification of highly suspended solution.The PSf membrane was prepared via a co-casting technique.The effects of CaCO3 particle concentration,particle diameter,membrane initial permeability,reversal of filtration surface of the membrane on the filtration performance were investigated.Results showed that the initial water permeability has no significant effect on the filtration stability.The particle concentrations controlled the steady membrane permeability.In case the particle diameter is lower than the membrane pore size,the pore blockage leads to drastic decline in permeability;however,when particle diameter is larger than the membrane pore size,cake formation is the main reason for the permeability degradation.Reversing the filtration surface,the filtration using top surface showed slightly higher permeability than bottom surface.In beer filtration,open surface PSf membrane evidently showed advantage against 0.4 μm PES membranes.Results indicate that the open surface PSf membranes are suitable for clarification of highly suspended solution,for example suspension with particles or bacteria,beer,wine or active sludge.

关 键 词：聚砜 微孔膜 错流过滤 悬浮物 

分 类 号：TQ028.8[化学工程]