Flat membrane element and regeneration method thereof

• US 20090202746A1
• Filed: 03/20/2009
• Published: 08/13/2009
• Est. Priority Date: 01/06/2006
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi Plant Technologies Limited (Hitachi, Ltd.)
• Inventors: Noto, Kazuhiko, Fujimoto, Takashi, Tagashira, Tatsuaki, Hatanaka, Mitsuru, Takemura, Kiyokazu
• Granted Patent: US 7,992,724 B2
• Time in Patent Office: Days
• US Class Current: 427/596
• CPC Class Codes: B01D 2313/04 Specific sealing means
• CPC Class Codes: B01D 2321/00 Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
• CPC Class Codes: B01D 63/081 Manufacturing thereof
• CPC Class Codes: B01D 65/003 Membrane bonding or sealing
• CPC Class Codes: B01D 65/02 Membrane cleaning or sterilisation ; Membrane regeneration

Abstract

To reuse support plate and to fix a membrane sheet by the same method both in a new product manufacturing and in regeneration. In a flat membrane element including a deposit fixed portion formed by lapping a membrane sheet performing solid-liquid separation onto a support plate supporting the membrane sheet and by emitting a laser to a circumferential edge of the membrane sheet to deposit fix the member sheet onto the support plate, and making an inside of the membrane sheet surrounded by the deposit fixed portion be a solid-liquid separating area; an embrocation having laser absorption property is applied on the surface of the membrane sheet of the deposit fixed portion. At the time of regeneration, such a portion of the membrane sheet that corresponds to the solid-liquid separating area is cut off and, after that, a new membrane sheet is lapped on the embrocation and the new membrane sheet and the embrocation are deposit fixed by a laser.

Claims

1. A regeneration method of a flat membrane element lapping a membrane sheet onto a support plate to laser deposit a circumference of the membrane sheet and covering a laser deposited portion with an embrocation having laser absorption property,

wherein the membrane sheet inside the laser deposited portion is cut off and a new membrane sheet is lapped onto the embrocation and a laser deposition is performed thereto to regenerate the membrane element.

2. The regeneration method of the flat membrane element according to claim 1,

wherein the laser deposited portion of the newly lapped membrane sheet is covered by the embrocation having laser absorption property.