JPH08215549A - Dipped-membrane solid-liquid separator - Google Patents

Abstract

PURPOSE: To surely prevent the deposition of cake and gel layers on the surface of a membrane and to surely release the layers by connecting a diffuser member to a membrane module directly or through a rigid body so that the vibration caused by the diffusion of air is propagated to the module. CONSTITUTION: The inside of a hollow fiber 2 is evacuated by a suction pump 10, and the permeated water is discharged through the hollow fiber 2, water collecting pipes 3 and 4 and pipelines 5, 6, 7 and 9, a blower is simultaneously operated, and bubbles flow out from a diffser pipe 14. Since the bubbles ascend along the hollow fiber 2, cake and gel layers are not deposited but released. The vibration of the diffuser pipe 14 caused when air is diffused from the pipe 14 is propagated to a membrane module 1 through the rigid body (pipeline 17 and fixing pipes 12 and 13), and the hollow fiber 2 is finely vibrated. Consequently, the deposition of the cake and gel layers on the hollow fiber 2 is prevented, and the release of the layers is promoted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged membrane type solid-liquid separator, and more particularly to an improved submerged membrane type solid-liquid separator for promoting peeling of a cake gel layer on the membrane surface.

[0002]

2. Description of the Related Art In a submerged membrane type solid-liquid separation device, a permeated water is taken into the membrane module by immersing the membrane module in a liquid to be treated and depressurizing the inside of the membrane module.
In order to prevent the cake / gel layer from adhering to the membrane surface of the membrane module or to peel off the cake / gel layer that has adhered, a diffusing tube is placed below the membrane module and the diffusing tube is used to diffuse the diffusing tube. The air bubbles that are discharged are made to rise along the film surface.

[0003]

DISCLOSURE OF THE INVENTION The present invention more reliably prevents the cake / gel layer from adhering to the membrane surface in such a submerged membrane-type solid-liquid separation device and removes the adhered cake / gel layer more reliably. It is an object of the present invention to provide an immersion membrane type solid-liquid separation device that can be used.

[0004]

A submerged membrane type solid-liquid separation device of the present invention is a membrane module which is immersed in a liquid to be treated and which takes in permeated water by depressurizing an internal permeated water chamber, A submerged membrane solid-liquid separation device having an air diffuser disposed below a membrane module and raising air bubbles from the air diffuser along a membrane surface. On the other hand, it is characterized in that it is connected directly or via a rigid body so that the vibration at the time of air diffusion propagates to the membrane module.

The rigid body is preferably made of metal, hard plastic such as hard vinyl chloride, or ceramics.

[0006]

In the immersion membrane type solid-liquid separation device of the present invention, the vibration generated by the diffusing member at the time of diffusing is propagated to the membrane module to vibrate the membrane module. This accelerates the prevention of the cake / gel layer from adhering to the film surface and the peeling of the adhered cake / gel layer.

The apparatus of the present invention can be used in various fields such as an aeration tank for biological treatment and a solid-liquid separation treatment tank for suspended water.

[0008]

EXAMPLE FIG. 1 is a side view of an immersion membrane type solid-liquid separator according to an example. The membrane module 1 comprises a large number of hollow fiber membranes (hereinafter abbreviated as hollow fibers) 2 stretched in the horizontal direction, and both ends of each hollow fiber 2 are of water collecting pipes 3 and 4 made of a synthetic resin tubular body. It is embedded in the pipe wall and the tip of the hollow fiber 2 is open in the water collection pipe 3. The water collecting pipes 3 and 4 are arranged vertically, and a large number of horizontal hollow fibers 2 are vertically arranged in multiple stages.

The water collecting pipes 3 and 4 are made of metal or hard plastic.

Water intake pipes 5 and 6 are connected to the upper ends of the water collecting pipes 3 and 4 through a union joint J. Piping 5,6
Is erected upward and is connected to the collecting pipe 7.
The collecting pipe 7 is detachably connected to a fixed pipe 9 via a flange 8. A suction pump 10 is provided in the fixed pipe 9.

A hook 11 for lifting the submerged membrane type solid-liquid separator is attached to the collecting pipe 7. The hook 11 is attached to, for example, the tip of a metal chain wound around the pipe 7.

Fixing pipes 12, 13 made of metal or hard plastic are connected to the lower ends of the water collecting pipes 3, 4 via a union joint J. The fixing pipe 12 is L-shaped, and the lower end side thereof is fixedly connected to one end of the air diffusing pipe 14 by welding or adhesion. As the air diffuser 14,
Various materials such as those having small holes or slits on the tube wall, those having nozzles on the tube, and those made of a porous sintered body can be used.

The fixing pipes 12 and 13 have stoppers 15 and 16 therein.
It has been sealed by. The lower end of the fixing pipe 13 is fixedly connected to the air supply pipe 17 by welding, adhesion or the like. The tip of the pipe 17 is fixedly connected to the other end of the air diffuser 14 by welding, adhesion, or the like. The rear end of the pipe 17 is detachably connected to the fixed pipe 19 via a flange 18. The fixed pipe 19 is provided with an aeration blower 20. In the middle of this pipe 17 and the water intake pipe 6
The fixing pipe 21 is fixedly connected to the middle of the by welding or adhesion. The inside of this fixing pipe 21 is closed by a plug 22.

In the submerged membrane type solid-liquid separation device thus constructed, the membrane module 1 is immersed in the water W to be treated in the tank. At this time, the membrane module 1 is supported by the fixed pipes 9, 19 via the pipes 5, 6, 7 and the flanges 8, 18.

By depressurizing the inside of the hollow fiber 2 by the suction pump 10, the permeated water is taken out through the hollow fiber 2, the water collecting pipes 3, 4, and the pipes 5, 6, 7, 9. At the same time, the blower 20 is actuated to let air bubbles flow out from the air diffuser 14.
The bubbles rise along the hollow fibers 2 to prevent the cake / gel layer from adhering and peel it off. Further, the vibration generated in the air diffuser 14 when air is diffused from the air diffuser 14 propagates to the membrane module 1 via the rigid body (the pipe 17 and the fixing pipes 12 and 13) and vibrates the hollow fiber 2 finely. Let This promotes the prevention of the cake gel layer from adhering to the hollow fibers 2 and the peeling.

Since the membrane module 1 and the air diffusing tube 14 are integrated, they can be transported and put into and taken out of the tank integrally. When putting in and out of the tank, the hook of the crane can be hooked on and taken out of the hook 11 with the flanges 8 and 18 removed.

In the present invention, a plurality of membrane modules 1
May be arranged in the depth direction of the paper and connected to each other.
In this case, the collecting pipe 7 for water intake from each membrane module 1 and the pipe 17 for supplying air to each membrane module 1 may be individually connected to a fixed pipe via a flange, or a part or all of them may be gathered and then the fixed pipe. You can also connect to it.

Although the hollow fiber 2 is used in the above embodiment,
Other membrane elements such as tubular membranes and flat membranes may be used. In the case of the flat membrane, the air diffuser may be fixedly connected to the frame body in which the elements are stacked and accommodated. This connection is optional such as welding or bolt (for example, U bolt) fastening.

In the embodiment shown in FIG. 1, a rigid body (fixing pipes 12, 1) for fixedly connecting the membrane module 1 and the air diffusing pipe 14 is used.
3) is located below the membrane module 1, but the second
As schematically shown in FIGS. (A) and (b), this connecting rigid body 24 may be arranged laterally or above the membrane module 1. Further, as shown in FIG. 2C, the membrane module 1 and the air diffusing tube 4 are surrounded by a frame body 25 made of a rigid material, and the frame body 22
On the other hand, the membrane module 1 and the air diffusing tube 14 may be fixedly connected.

In the present invention, the membrane modules 1 may be arranged vertically in multiple stages as shown in FIG. In the present invention, the rigid body may be omitted and the air diffusing member may be directly attached to the membrane module.

[0021]

EFFECTS OF THE INVENTION The immersion membrane type solid-liquid separation device of the present invention is capable of sufficiently preventing the cake / gel layer from adhering to the membrane surface and peeling it off. it can.

According to the present invention, since the membrane module and the air diffusing member are integrated, the positional relationship between the membrane module and the air diffusing member is always regular, and the bubbles from the air diffusing member are surely formed in the membrane. It comes into contact with the surface, and this also improves the effect of preventing the cake / gel layer from adhering to the film surface and the peeling effect.

Further, since the membrane module and the air diffusing member are integrated, they can be easily transported and put in and out of the tank, and the storage space when taken out from the tank can be small. .

[Brief description of drawings]

FIG. 1 is a side view of an immersion membrane type solid-liquid separator according to an embodiment.

FIG. 2 is a side view of a main part of a submerged membrane type solid-liquid separator according to another embodiment.

FIG. 3 is a side view of a main part of a submerged membrane type solid-liquid separator according to still another embodiment.

[Explanation of symbols]

 1 Membrane Module 2 Hollow Fibers 3,4 Water Collection Pipes 12, 13, 21 Fixing Pipes 14 Diffuser Pipes 24 Rigid Body

Claims (1)

[Claims] 1. A membrane module which is immersed in a liquid to be treated and takes in permeated water by depressurizing an inner permeate chamber, and an air diffuser is arranged below the membrane module. In a submerged membrane solid-liquid separator having an air diffusing member for raising air bubbles from the membrane along the membrane surface, the air diffusing member is applied to the membrane module so that vibration during air diffusing propagates to the membrane module. An immersion membrane type solid-liquid separation device, characterized in that it is connected directly to or through a rigid body.