Flat membrane element and regeneration method thereof

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 10 including a deposit fixed portion 18 formed by lapping a membrane sheet 14 performing solid-liquid separation onto a support plate 12 supporting the membrane sheet 14 and by emitting a laser to a circumferential edge of the membrane sheet 14 to deposit fix the member sheet 14 onto the support plate 12, and making an inside of the membrane sheet 14 surrounded by the deposit fixed portion 18 be a solid-liquid separating area 20; an embrocation 22 having laser absorption property is applied on the surface of the membrane sheet 14 of the deposit fixed portion 18. At the time of regeneration, such a portion of the membrane sheet 14 that corresponds to the solid-liquid separating area 20 is cut off and, after that, a new membrane sheet is lapped on the embrocation 22 and the new membrane sheet and the embrocation 22 are deposit fixed by a laser.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial sectional side view showing a first embodiment of a flat membrane element according to the present invention;

FIG. 2 is a partial plan view showing the first embodiment of the flat membrane element according to the present invention;

FIGS. 3 a to 3d are partial sectional side views showing regeneration procedures of a flat membrane element 10 in which FIG. 3a is a sectional view of a membrane sheet cutting off a solid-liquid separating area, FIG. 3b is a sectional view showing a state lapping a new membrane sheet, FIG. 3c is a sectional view showing a laser deposited state, and FIG. 3d is a sectional view showing a state where the replacement with a new membrane sheet is performed with respect to an opposite surface;

FIG. 4 is a partial sectional side view showing a state of a regenerated flat membrane element 10A in use;

FIG. 5 is a partial sectional side view showing a second embodiment of the flat membrane element;

FIG. 6 is a partial sectional side view showing a third embodiment of the flat membrane element according to the present invention; and

FIG. 7 is a partial sectional view showing a general structure of a flat membrane element.

Claims

1. A flat membrane element performing solid-liquid separation, comprising: a membrane sheet for filtration, the membrane sheet being made of a synthetic resin material;a support plate to have said membrane sheet attached thereon;a deposit fixed portion formed by a circumferential edge of said membrane sheet and said support plate which are lapped each other and laser deposited; andan embrocation having laser absorption property applied on the surface of said membrane sheet of said deposit fixed portion to cover a laser deposited portion.

2. The flat membrane element according to claim 1, wherein said embrocation is composed of a same synthetic resin material as of said membrane sheet and a pigment mixed threrein.

3. The flat membrane element according to claim 1, wherein said membrane sheet is attached onto both surfaces of said support plate, respectively.

4. 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.

5. The regeneration method of the flat membrane element according to claim 4, wherein the laser deposited portion of the newly lapped membrane sheet is covered by the embrocation having laser absorption property.