Toray Industries, Inc.

Kentaro Kobayashi

Atsushi Kobayashi

Masakazu Koiwa

Hiroo Takabatake

Masato Yanagibashi

Satoko Kanamori

Ayumi Mori

Hirofumi Morikawa

Kazuki Hagawa

Yoichiro Kozaki

Fumi Hojo

The present invention relates to a method of operating a membrane filtration unit including plural hollow fiber membrane modules connected to each other in parallel, the method including: a filtration step; a collection step; and a recovery step, in which a relation of n≥n>nis satisfied, where nis the number of the hollow fiber membrane modules simultaneously used in executing the filtration step, nis the number of the hollow fiber membrane modules simultaneously used in executing the collection step, and nis the number of the hollow fiber membrane modules simultaneously used in executing the recovery step.

Method for operating membrane filtration unit and membrane filtration unit

The present invention relates to a filtration device including: a flow rate control unit; a separation membrane module; a liquid flow rate detection unit detecting a liquid flow rate at a freely-selected part; and an external control unit controlling a state of the flow rate control unit, in which the external control unit includes: a target range setting step of setting a target flow rate range A; a control state recording step of recording a state S of the flow rate control unit when the liquid flow rate at the freely-selected part first enters within the target flow rate range A; a state setting step of setting the flow rate control unit to the state S; and a flow rate controlling step of controlling the liquid flow rate to be within the target flow rate range A.

Filtration apparatus and operation method therefor

The present invention relates to a separation membrane including an organic polymer resin, in which a volume V1 of fine pores having a pore diameter of 100 nm or more is 0.3 cm/g or more and 0.5 cm/g or less, a volume V2 of fine pores having a pore diameter of less than 100 nm is 0.02 cm/g or more and less than 0.1 cm/g, and a ratio V1/V2 of the fine pore volume V1 to the fine pore volume V2 is 3 or more and 60 or less.

Separation film

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

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Otsu, Japan

Kentaro Kobayashi