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1. (WO2013146976) OPERATING METHOD FOR MEMBRANE SEPARATION DEVICE AND MEMBRANE SEPARATION DEVICE

Pub. No.:    WO/2013/146976    International Application No.:    PCT/JP2013/059179
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Fri Mar 29 00:59:59 CET 2013
IPC: B01D 65/02
C02F 1/44
C02F 3/12
Applicants: KUBOTA CORPORATION
株式会社クボタ
Inventors: YOSHIDA, Yasuyuki
吉田 康之
OHTSUKA, Yuji
大塚 裕司
Title: OPERATING METHOD FOR MEMBRANE SEPARATION DEVICE AND MEMBRANE SEPARATION DEVICE
Abstract:
A membrane separation device (6) is provided with a separation membrane (60) disposed so as to be immersed in water to be treated and an air diffuser (7) disposed beneath the separation membrane (60) and includes a target value setting means (calculation unit) (10a) that sets a target value for an air diffusion volume from the air diffuser (7) on the basis of intermembrane pressure and an air diffusion volume control means (PID control unit) (10b) that controls the air diffuser (7) such that the air diffusion volume is the target value. The target value setting means (10a) sets the absolute value for the change amount or the change rate for the target value when the air diffusion volume is increased to a value larger than the absolute value for the change amount or the change rate for the target value when the air diffusion volume is decreased, and thus operating costs can be effectively reduced.