| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a porous film suitable for liquid separation which has high physical durability against a liquid to be treated and high permeability even when it is used in an activated sludge vessel for solid-liquid separation. Ž<P>SOLUTION: The porous film is characterized in that the porous film has a single layer of a porous resin layer on the surface of a porous substrate, that the porous resin layer includes a spherical member of an average diameter of 0.5 to 10 μm, that at least one of the pores of an average pore diameter of 0.05 to 5 μm inclusive is formed on the surface of the spherical member and that the average diameter of at least one side of the porous film is 0.05 to 5 μm inclusive. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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