MEMBRANE TREATMENT APPARATUS

Abstract

A membrane treatment apparatus (1) comprising: a plurality of flat membrane elements (2) which are immersed in a liquid to be treated, disposed side by side in the first direction so that membrane surfaces face each other; a supporting member (8) for holding the flat membrane element (2) provided at an end part of the flat membrane element on a first side in the second direction; and an aeration means (10) provided below the flat membrane element (2); wherein a lower edge of the flat membrane element (2) is formed to extend upward from the first side to a second side in the second direction, or to extend upward and horizontally from the first side to the second side in the second direction.

Description

Claims

1. A membrane treatment apparatus having a first direction and a second direction in a horizontal direction and a height direction, comprising: a plurality of flat membrane elements which are immersed in a liquid to be treated, disposed side by side in the first direction so that membrane surfaces face each other;a supporting member for holding the flat membrane element provided at an end part of the flat membrane element on a first side in the second direction; andan aeration means provided below the flat membrane element;wherein a lower edge of the flat membrane element is formed to extend upward from the first side to a second side in the second direction, or to extend upward and horizontally from the first side to the second side in the second direction.

2. The membrane treatment apparatus according to claim 1, wherein the flat membrane element comprises a first filtration membrane on one side in the first direction,a second filtration membrane on the other side in the first direction, anda flow passage member that is provided between the first filtration membrane and the second filtration membrane and holds a gap between the first filtration membrane and the second filtration membrane, through which a permeated liquid of the first filtration membrane and a permeated liquid of the second filtration membrane flow.

3. The membrane treatment apparatus according to claim 2, wherein the flat membrane element is configured such that lower edges of the first filtration membrane, the second filtration membrane and the flow passage member are formed to extend upward from the first side to the second side in the second direction, or to extend upward and horizontally from the first side to the second side in the second direction.

4. The membrane treatment apparatus according to claim 2, wherein the flat membrane element comprises an auxiliary member at a lower end thereof, anda lower edge of the auxiliary member is formed to extend upward from the first side to the second side in the second direction, or to extends upward and horizontally from the first side to the second side in the second direction.

5. The membrane treatment apparatus according to claim 1, wherein the flat membrane element has a liquid-impermeable portion on a peripheral part of the membrane surface and a liquid-permeable portion on an inner region of the peripheral part, andan upper edge of the liquid-permeable portion is formed to extend downward from the first side to the second side in the second direction, or to extend downward and horizontally from the first side to the second side in the second direction.

6. The membrane treatment apparatus according to claim 1, wherein the plurality of flat membrane elements disposed side by side in the first direction are held by a common said supporting member.

7. The membrane treatment apparatus according to claim 1, wherein the plurality of the flat membrane elements disposed side by side in the first direction are each held by a separate said supporting member.

8. The membrane treatment apparatus according to claim 1, wherein the flat membrane element has an outlet part from which a permeated liquid that has passed through a filtration membrane is taken out, anda collection part is provided in communication with the outlet part.

9. The membrane treatment apparatus according to claim 8, wherein the supporting member also serves as the collection part.

10. The membrane treatment apparatus according to claim 1, wherein at least one of the plurality of flat membrane elements disposed side by side in the first direction has a lower edge which is higher than the adjacent flat membrane element.

11. The membrane treatment apparatus according to claim 1, further comprising a vertically extending partition member provided so as to face an edge of the flat membrane element on the second side in the second direction.

12. The membrane treatment apparatus according to claim 1, wherein the aeration means is set so that the amount of air diffusion is greater on the first side than on the second side in the second direction.