Filter unit

Patent metadata

Field	Value
Publication number	US-2019039025-A1
Application number	US-201615757711-A
Country	US
Kind code	A1
Filing date	Oct 5, 2016
Priority date	Oct 8, 2015
Publication date	Feb 7, 2019
Grant date	—

Abstract

An object of the present invention is to provide a filter unit in which hollow fiber membranes can be effectively cleaned. A filter unit of the present invention includes a plurality of filtration modules and one or more air bubble generation modules that supply bubbles to the filtration modules from below. Each filtration modules includes a plurality of hollow fiber membranes extending in an up-down direction and arranged side by side in a curtain shape and which are arranged at intervals. The one or more air bubble generation modules supply coarse bubbles to the filtration modules.

First claim

1 . A filter unit comprising:
a plurality of filtration modules which each include a plurality of hollow fiber membranes extending in an up-down direction and arranged side by side in a curtain shape and which are arranged at intervals; and one or more air bubble generation modules that supply bubbles to the filtration modules from below, wherein the one or more air bubble generation modules supply coarse bubbles to the filtration modules.

2 . The filter unit according to claim 1 , wherein no member that blocks an upward movement of the bubbles is provided between the filtration modules.

3 . The filter unit according to claim 1 , wherein an average horizontal diameter of the bubbles is in a range from 10 mm to 250 mm.

4 . The filter unit according to claim 1 , wherein the one or more air bubble generation modules have bubble discharge holes having a circular shape, an elliptical shape, or a rectangular shape.

5 . The filter unit according to claim 4 , wherein the bubble discharge holes have an oblong shape.

6 . The filter unit according to claim 5 , wherein a length of long sides of the bubble discharge holes is in a range from 20 mm to 60 mm, and a ratio of the length of the long sides to a length of short sides of the bubble discharge holes is in a range from 2 to 8.

7 . The filter unit according to claim 4 , wherein the bubble discharge holes have a circular shape or an elliptical shape, and an average diameter of the bubble discharge holes of the one or more air bubble generation modules is in a range from 10 mm to 50 mm.

8 . The filter unit according to claim 1 , wherein the one or more air bubble generation modules supply the bubbles intermittently.

9 . The filter unit according to claim 1 , wherein the filtration modules are arranged at equal intervals at least in a transverse direction, and an average interval between the filtration modules that are adjacent to each other in the transverse direction is in a range from 15 mm to 30 mm.

10 . The filter unit according to claim 1 , wherein an existence density of the hollow fiber membranes included in the filtration modules is in a range from 4 per square centimeter to 15 per square centimeter.

Assignees

• Sumitomo Electric Industries

Inventors

• Tanaka Hiromu
• Yoneda Tomoyuki
• Miki Hiroko
• Morita Toru

Classifications

• B01D63/043

  with separate tube sheets · CPC title

• C02F1/44

  by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)} · CPC title

• B01D2321/185

  Aeration · CPC title

• C02F1/74

  with air (aeration of stretches of water C02F7/00) · CPC title

• B01D2313/26

  Specific gas distributors or gas intakes · CPC title