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Home > Experiment > Membrane selection and other > 微滤膜

微滤膜

微滤（MF）：截留直径大小在0.1um以上的物质，其基本原理是筛孔分离过程，微滤膜的材质分为有机和无机两大类，有机聚合物有醋酸纤维素、聚丙稀、聚碳酸酯、聚砜、聚酰胺等；无机膜材料有陶瓷和金属等。鉴于微孔滤膜的分离特征，微孔滤膜的应用范围主要是从气相和液相中截留微粒、细菌以及其它污染物，以达到净化、分离、浓缩的目的。

Introduction

膜材料

1、烧结金属微孔滤膜(如不锈钢)；
2、无机微孔滤膜(如氧化铝、玻璃、二氧化硅等)；
3、有机高分子微孔滤膜(如聚乙烯、聚砜、聚酰胺、醋酸纤维素等)。

工作原理

一般认为MF的分离机理为筛分机理，膜的物理结构起决定作用。此外，吸附和电性能等因素对截留率也有影响。其有效分离范围为0.1-10μm的粒子，操作静压差为0.01-0.2MPa。微孔滤膜的截留机理因其结构上的差异而不尽相同。微滤膜允许大分子有机物和溶解性固体（无机盐）等通过，但能阻挡住悬浮物、细菌、部分病毒及大尺度的胶体的透过，微滤膜两侧的运行压差（有效推动力）一般为0.7bar

工业应用

1、除去水中的细菌和其它微粒；

2、除去组织液、抗菌素、血清、血浆蛋白质等多种溶液中的菌体；

3、除去饮料、酒类、酱油、醋等食品中的悬浊物、微生物和异味杂质。

4、作为超滤、纳滤、反渗透的预过滤；

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