Development of Testing Method of Performance of Membrane Filters for Dilute Liguidborne Particles

稀液载颗粒膜过滤器性能测试方法的研制

• 批准号: 08455366
• 负责人: EMI Hitoshi
• 金额: $ 3.39万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455366/
• 关键词: Membrane filter; PSL particle; Electrostatic double layr; van der Waals force; Retention efficiency; Filtration velocity; Media filtration; Particle trajectory; ブラウン拡散

The present work is aimed at developing and proposing the testing methods on performance of various membrane filters for dilute liquidborne particles with diameter of submirometer. Particle panetrations of membrane filters with various structures were measured with light-scattering type particle counters. Major conclusion obtained by this work are ;1. Interception effect acts on the filtration of particles with diamter smaller than the pore size of membrane filters.2. Since the difference of porosity among filters can have influence on the shape of electrostatic double layr around their collection body in deionized water system.3. For fiber-like membrane filters, particle penetration are subject to decrease because high ion concentration of filtration liquid compresses the electrostatic double layr around their collection body.These understandings suggest that it is necessary to introduce a new index accounting for physical properties such as fiber diameter, packing density and filter thickness instead of pore size rated by the bubble point method in order to predict their collection efficiency for particles with diameter smaller than the pore size.

本工作旨在开发和提出各种膜过滤器对亚微米级稀释液载颗粒性能的测试方法。采用光散射式粒子计数器测量了各种结构的膜过滤器的粒子透过率。本工作获得的主要结论是： 1．对直径小于膜过滤器孔径的颗粒物起到截留作用。 2．由于去离子水系统中过滤器孔隙率的差异会影响其收集体周围静电双层的形状。 3．对于纤维状膜过滤器，由于过滤液的高离子浓度会压缩其收集体周围的静电双层，因此颗粒穿透力会降低。这些理解表明，有必要引入一个新的指标来解释纤维直径等物理特性、填充密度和过滤器厚度，而不是通过泡点法评定的孔径，以预测其对直径小于孔径的颗粒的收集效率。

项目成果

江見準,大谷吉生: "ポリテトラフルオロエチレン製メンブレンフィルタによる純水中粒子の分離" 日東技報. 34・1. 1-8 (1996)

Jun Emi，Yoshio Otani：“使用聚四氟乙烯膜过滤器分离纯水中的颗粒”Nitto Giho 34・1（1996）。