Mitsubishi Rayon Company, Limited

Michio Inoue

Hisao Tanaka

Kazuto Kawashima

Hisayoshi Yamamori

Atsushi Kawai

Ikuo Igami

Yuzuru Katagiri

Water contaminated by small amounts of bacteria, pyrogens and low molecular weight organic compounds is treated by passing said contaminated water through a microporous polyolefin membrane having a multitude of rectangularly shaped nodule areas, each nodule area containing a plurality of strip-like microfibrils arranged in a longitudinal direction from one surface of a nodule to the side opposite said surface thereby forming a plurality of strip-like micropores in each nodule, said micropores being contiguous with each other from one surface to the other surface of the membrane thereby forming a micro-stacked structure, the mean pore diameter of said micropores ranging from 0.03 to 0.8 .mu..

Water purifying method and system

A hydrophilized membrane of a porous hydrophobic material having micropores each defined by a surface at least part of which is coated with a hydrophilizing agent which is solid at about 20.degree. C. and substantially insoluble in water. The hydrophilizing agent is preferably selected from monofatty acid esters of propylene glycol. Also disclosed are processes for hydrophilizing such porous hydrophobic membranes.

Hydrophilized membrane of porous hydrophobic material and process for

A hollow-fiber filtering module includes a casing having an open end and an inlet for introducing water to be treated thereinto. A bundle of hollow fibers is mounted within the casing, each of the hollow fibers having an open end. A fastening member sealingly joins the open ends of the hollow fibers to the open end of the casing in sealing relation thereto, the open ends of the hollow fibers opening to the exterior of the casing. Part of the hollow fibers are made of a microporous membrane having a portion of a hydrophobic nature, and the other hollow fibers are hydrophilic microporous membranes. Gas introduced into the filtering module can easily permeate the hydrophobic portions of the hollow fibers and is discharged through the bores of the hollow fibers from their open ends together with the filtered water. There is also disclosed a water purification device employing such a hollow-fiber filtering module.

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Kasugai, Japan

Michio Inoue