| 摘要 |
PROBLEM TO BE SOLVED: To prepare efficiently water of high safety containing only a small amount of impurities and microbes by forming round or ellipse holes on both faces of a membrane with a polyacrylonitrile hollow fiber filter membrane with small diameter layers of the membrane formed only inside the membrane and filtering. SOLUTION: When the purification of water in which pathogenic microbes contained in tap water are removed, a polyacrylonitrile hollow fiber filter membrane with round or ellipse holes on both faces of a membrane having small diameter layers of the membrane formed only inside the membrane is used. At that time, the membrane with round or ellipse holes formed on both faces is used to make the fouling of the membrane hard to generate. For the purpose of improving the permeability of the membrane, the average pare diameter is set as approximately 1μm or more to 50μm or less on the in-membrane surfaces and approximately 0.05μm or more to 10μm or less on the out- membrane surface. Also it is preferable to set the inner diameter of the polyacrylonitrile hollow fiber filter membrane is set as approximately 0.5 mm-5 mm.
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