Hollow fiber membrane module

• US 5,480,553 A
• Filed: 10/07/1993
• Issued: 01/02/1996
• Est. Priority Date: 02/12/1992
• Status: Expired due to Term

• Current Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Original Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Inventors: Kobayashi, Masumi, Yamamori, Hisayoshi, Hoshide, Akira
• Primary Examiner(s): KIM, SUN U
• Application Number:
  US08/129,078
• Time in Patent Office: 817 Days
• Field of Search: 210/321.79, 210/321.8, 210/321.88, 210/321.89, 210/232, 210/500.23, 210/650, 210/653, 210/654, 210/791, 210/793, 210/796, 210/797, 139/383 R, 139/383 B, 422/48
• US Class Current: 210/650
• CPC Class Codes: B01D 2313/025 Specific membrane holders
• CPC Class Codes: B01D 2315/06 Submerged-type; Immersion type
• CPC Class Codes: B01D 63/02 Hollow fibre modules
• CPC Class Codes: B01D 63/024 with a single potted end
• CPC Class Codes: B01D 63/0241 being U-shaped
• CPC Class Codes: B01D 63/026 Wafer type modules or flat-surface type modules
• CPC Class Codes: B01D 63/043 with separate tube sheets

Abstract

A hollow fiber membrane module comprising (a) hollow fibers, (b) a fastening member for fixing the ends of the hollow fibers while leaving them open, and (c) a structural member for enclosing and supporting the fastening member, the hollow fiber membrane module being useful in the filtration of water by suction from the surface to the inside of the hollow fibers with intermittent or continuous cleaning of the membrane surfaces of the hollow fibers, characterized in that the hollow fibers comprise a textile fabric containing hollow fibers as the weft and the cross-section of the fastening member perpendicular to the hollow fibers is shaped like an elongated rectangle. In this module, the hollow fibers rarely cohere together into a mass, and the membrane surfaces of the hollow fibers can be efficiently cleaned concurrently with the filtration, so that the loss of the filtering function is minimized.

Claims

1. A filtration method which comprises (A) immersing a hollow fiber membrane module in water to be treated, said hollow fiber membrane module comprising (a) hollow fibers, (b) a fastening member for fixing the ends of said hollow fibers while leaving said ends open, and (c) a structural member for enclosing and supporting said fastening member, said hollow fibers comprising a textile fabric containing hollow fibers as the weft, the cross-section of said fastening member perpendicular to said hollow fibers being in an elongated rectangular shape;

and (B) filtering the water by suction from the surface to the inside of said hollow fibers with intermittent or continuous cleaning of the membrane surfaces of said hollow fibers.

2. A filtration method as claimed in claim 1 wherein the membrane surfaces are cleaned by air bubbling.

3. A filtration method as claimed in claim 1 wherein the filtration is carried out by intermittent suction in which the suction is interrupted at regular intervals.