Toray Industries, Inc.

Hirofumi Morikawa

Masahiro Henmi

Shuji Furuno

Shin-ichi Minegishi

Toshiyuki Ishizaki

Hiroo Takabatake

Yuji Tanaka

Kentaro Kobayashi

Kazuki Hagawa

Kenji Sakai

Hidetada Kobayashi

Toshyuki Ishizaki

Shin-Ichi Minegishi

An efficient method is provided for cleaning hollow fiber membrane modules, the method being capable of efficiently removing substances accumulated inside hollow fiber membrane modules. The internal liquid on the raw liquid side of the hollow fiber membrane module () is discharged from a lower end face nozzle () of the hollow fiber membrane module () while air-cleaning is performed. The method for cleaning hollow fiber membrane modules is characterized in that the rate of liquid discharge from the lower end face nozzle of the hollow fiber membrane module () when discharging the internal liquid from the lower end face nozzle is adjusted so that the air supplied from the lower end face nozzle of the hollow fiber membrane module () through the aeration holes is supplied to the hollow fiber membrane module ().

Method for cleaning hollow fiber membrane module

Method of sewage treatment and sewage treatment apparatus

This invention provides a hollow fiber membrane module which can reduce pressure loss in discharging water within a module and can reduce operating power. A hollow fiber membrane bundle is disposed within a cylindrical case having in its side face an opening part for the inflow/outflow of water, and the end of the hollow fiber membrane bundle is bonded at an axially outer position with respect to the opening for the inflow/outflow of water. A distribution holes is provided axially inward of the opening for the inflow/outflow of water and so as to surround the outer periphery of the hollow fiber membrane bundle, and grooves and/or corrugated protrusions are provided on the inner face of the distribution cylinder so as to be in communication with each other among the distribution holes.

Hollow fiber membrane module

A method for manufacturing a porous membrane including a three-dimensional network structure and a spherical structure is provided. The method includes forming a porous membrane having a spherical structure, applying a resin solution onto at least one surface of the porous membrane having the spherical structure, followed by immersing the membrane in a solidification liquid, thereby forming the three-dimensional network structure on at least one surface of a porous membrane having the spherical structure.

Porous membrane and method for manufacturing the same

The object of the present invention is to provide a porous membrane having a high strength and excellent water permeability and rejection properties. The porous membrane of the present invention has both a three-dimensional network structure and a spherical structure. The porous membrane of the present invention is suitably used for water treatment membranes, battery separators, charged membranes, fuel cells, blood purification membranes, and the like.

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Kusatsu, Japan

Hirofumi Morikawa