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1. (WO2005110584) BACK WASHING METHOD AND SYSTEM OF FILTRATION MEMBRANE

Pub. No.:    WO/2005/110584    International Application No.:    PCT/JP2005/008765
Publication Date: Nov 24, 2005 International Filing Date: May 13, 2005
IPC: B01D 65/02
B01D 65/06
B01D 71/02
Applicants: NGK INSULATORS, LTD.
日本碍子株式会社
KANAYA, Shinjiro
金谷 新志郎
AOKI, Nobuhiro
青木 伸浩
Inventors: KANAYA, Shinjiro
金谷 新志郎
AOKI, Nobuhiro
青木 伸浩
Title: BACK WASHING METHOD AND SYSTEM OF FILTRATION MEMBRANE
Abstract:
A back washing method of a membrane filtration system which houses in a casing a ceramic filtration membrane comprising a substrate layer (11b) having countless filtration holes and a separation layer (11a) having filtration holes finer than those of the substrate layer, in which air having a pressure controlled to p1 is supplied to the secondary side of the filtration membrane, and, after filtration water standing in the membrane filtration system is drained gradually to the primary side, water in the filtration membrane is pushed out to the primary side together with the air by elevating the air pressure to p3 thus stripping blocking matters. Since a large quantity of water is not discharged at once, unlike in conventional methods, a back washing drain pipe having a small diameter can be designed without lowering back washing effect, and the facility can be made compact while enhancing the degree of freedom thereof.