[Background] People keen on tasting tea are plagued by the presence of crushed impurities in the tea soup, such as particles of tea leaf and hairs of tea leaf. [Purpose] The aim is to expand the use of nuclear track membranes (NTMs) for filtration of tea soup. [Methods] Flat membrane filtration equipment with the NTM placed in is used to separate the tea soup. [Results] The colority and turbidity of tea soup after the separation decrease with the intercept aperture. The total volume of residual particles in tea soup decreases with pore size; the peaks of size distribution of particles decrease with the pore size. The flux of NTM is good and decreases with the pore size. After cleaning, membrane flux of 15-μm NTM can be restored to more than 80％ of the original. It is found that the membrane can extend the life time and improve economic efficiency by controlling the initial flow rate. [Conclusion] NTM can effectively intercept the particles larger than its pore size in the tea soup. The 15-μm NTM is the best to separate the tea soup with the excellent flux and retention effect during gravity, and 1-μm NTM is the best choice under pressure filtration.%利用兰州重离子加速器提供的25 MeV·u-186Kr26+离子辐照的聚对苯二甲酸乙二醇酯薄膜蚀刻制备了多种规格核孔膜;针对饮茶时残存杯底的茶垢,用核孔膜开展了一系列茶汤过滤实验及滤后分析.过滤方法为螺旋平板小试仪上进行的死端过滤.对过滤后的茶汤和滤后膜表面分别进行了激光粒度、浊度色度、扫描电镜等分析,证明对茶汤除杂的有效性,观察截留的颗粒物形态;用流速测定的方法记录了滤膜的流速衰减过程;对流速和过滤效果俱佳的15μm核孔膜进行了在水壶中冲泡的耐久性测试,提出了核孔膜污染后可能的清洗方法.本文探讨了过滤过程初始流速对滤膜寿命的影响,指出控制初始流速是一种核孔膜过滤的优化操作,具有一定参考意义.
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