JPH0732866B2 - Filtration membrane module - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration membrane module, and a filtration liquid collection in which an opening of a tubular filtration membrane having one end closed and the other end opened is constituted by a plate-like member to constitute a part of a peripheral wall. In order to face the inside of the room, the distal end of the tubular filtration membrane on the opening side is penetrated into the through hole provided in the plate-shaped body, and the tube-shaped filtration membrane is sealed to the plate-shaped body.
The present invention relates to a filtration membrane module provided with a resin layer that is adhesively fixed in a state .

[0002]

2. Description of the Related Art A conventional filtration membrane module generally has a structure as shown in FIG. That is, the partition plate-shaped plate 1 is provided at an appropriate portion in the middle of the frame 1 of the filtration membrane module.
a is formed, and a filtrate collection chamber 5 and a filtered liquid flow space 6 are formed on both sides of the plate 1a. The filtered liquid flow-through space 6 is open bidirectionally (for example, in the vertical direction) so that the filtered liquid can pass therethrough, and the filtered liquid flow-through space 6 has one end closed. A plurality of tubular filtration membranes 3 are arranged in parallel. The other end of the tubular filtration membrane 3 penetrates a through hole provided in the plate-shaped body 1a, and an opening 3a opened at the other end is attached to the filtrate collection chamber 5. . Furthermore, the tubular filtration membrane 3 is sealed to the plate-shaped body 1a.
A resin layer 4 (for example, a soft resin layer such as silicone that functions both as a sealing resin and a fixing resin) adhered and fixed in this state is provided on the side opposite to the filtrate collection chamber 5 side of the plate 1a. It is provided on the surface (that is, the surface on the side of the filtered liquid flow-through space 6 side). When the liquid to be filtered is filtered using such a filtration membrane module, the liquid to be filtered is caused to flow around the tubular filtration membrane 3 in the liquid flow passage space 6 while applying a permeation pressure, The liquid to be filtered is filtered by passing a part through the filtration membrane. In the filtration process, a pressure based on the permeation pressure is applied to the filtered liquid flow-through space 6 side to the filtered liquid collection chamber 5 side at the portion of the tubular filtration membrane 3 that penetrates the plate-shaped body 1a. become. Therefore, when the resin layer 4 is provided on the surface opposite to the filtrate collection chamber 5 side as described above, the pressure acts on the resin layer 4 as a compressive stress, so that the resin It has been conventionally considered that the generation of cracks in the layer 4 is suppressed and the leakage of the liquid to be filtered (leakage of the liquid to be filtered into the filtrate liquid collecting chamber 5) via the resin layer 4 is suppressed. It was Therefore, in the conventional filtration membrane module, the resin layer 4 is provided on the surface of the plate-shaped body 1a opposite to the filtration liquid collection chamber 5 side.

[0003]

However, when the above-mentioned conventional filtration membrane module is actually used, the crack K of the resin layer 4 is, as shown in FIG. 4, a process described below rather than in the filtration process. It was found that it is easy to occur in. That is, in order to eliminate clogging and the like of the tubular filtration membrane 3, pressure is applied in a direction opposite to the permeation pressure to wash the tubular filtration membrane 3 (hereinafter, the washing is called backwashing (backpressure washing)). It was found that the pressure applied at that time is easily generated in the process of performing the backwash pressure. The present invention has been made based on such findings, and an object of the present invention is to provide a means for suppressing the occurrence of cracks in the resin layer as described above and suppressing the leakage of the liquid to be filtered into the filtrate collection chamber. .

[0004]

A filtration membrane module according to the present invention comprises a tubular filtration membrane sealed to a plate.
The present invention is characterized in that the resin layer that is adhesively fixed in the state is provided on the surface of the plate-shaped body on the side of the filtrate collection chamber.

[0005]

According to this filtration membrane module, since the resin layer is provided on the surface of the plate-shaped body on the side of the filtrate collection chamber, backwashing is performed to eliminate clogging of the tubular filtration membrane. Even if is performed, the backwash pressure applied at that time acts as a compressive stress in the resin layer. Therefore, the occurrence of cracks in the resin layer during the backwash process can be suppressed. In the filtration process of performing filtration of the liquid to be filtered while applying the permeation pressure using the filtration membrane module, the permeation pressure may act as a tensile stress in the resin layer, which may cause a crack. However, it is easy to suppress the occurrence of cracks. Because, in general, the permeation pressure tends to be smaller than the backwash pressure, and compared with designing the resin layer to withstand the tensile stress due to the backwash pressure, the resin layer so as to withstand the tensile stress due to the permeate pressure. Is easier to design.

[0006]

As described above, when the filtration membrane module of the present invention is used, it is possible to suppress the occurrence of cracks in the resin layer in the backwashing process, which is actually easier than in the filtration process, as described above. Therefore, it becomes possible to substantially suppress the leakage of the liquid to be filtered into the filtrate collection chamber, and thus the conventional problems can be solved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the filtration membrane module of the present invention, and FIG. 2 shows a filtration device equipped with the filtration membrane module. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions.

In FIG. 1, reference numeral 1 is a frame body of the filtration membrane module, and the frame body 1 is made of a hard resin (for example, polyvinylidene chloride), and has a rectangular frame shape in which most of the frame body is opened vertically. It is molded. A partition-shaped plate-shaped body 1a is formed at an appropriate portion in the middle of the frame body 1. A filtrate collection chamber 5 and a filtered liquid flow space 6 are formed on both sides of the plate 1a.

The filtrate collection chamber 5 is a closed space which is closed outside except for the filtrate extraction section 7. On the other hand, the filtered liquid flow-through space 6 is opened vertically so that the filtered liquid can pass therethrough.
A plurality of tubular filtration membranes 3 are arranged side by side so as to extend in the longitudinal direction of the frame 1. Each of the ends of the plurality of tubular filtration membranes 3 is embedded in the wall 1b of the frame 1 on the side opposite to the filtrate extraction portion 7 (or, although not shown, the wall They are closed by abutting each body 1b and then fixing their abutment. An opening 3a is formed at each of the other ends of the plurality of tubular filtration membranes 3, and each of the openings 3a is formed by the plate-shaped body 1a to form a part of a peripheral wall. In order to face the inside of the liquid collection chamber 5, the tip end on the opening side of each tubular filtration membrane 3 has the plate-shaped body 1a.
Is penetrated through a through hole provided in the. The penetration state is a resin layer in which the interface is adhered to both the tubular filtration membrane 3 and the plate 1a by being provided in layers on the surface of the plate 1a on the side of the filtrate collection chamber 5 side. Due to the presence of No. 4, it becomes fixed and maintained in a sealed state .
As the resin layer 4, for example, a soft resin layer such as silicone that effectively functions as a sealing resin and a fixing resin is used.

Then, as shown in FIG. 2, the filtration membrane module is immersed in an appropriate position in the treatment tank 8 in which the liquid to be filtered is stored, and the filtrate extraction portion 7 of the filtration membrane module is placed in the treatment tank. 8 to the outside of 8, and a pump 9 for sucking the filtered liquid in the filtered liquid collecting chamber 5 and an air flow in the direction opposite to the filtered liquid to apply a backwash pressure to the drawing pipe portion. By providing the washing means 10, a filtration device capable of filtering the liquid to be filtered while appropriately performing backwashing is configured.

According to the filtration membrane module equipped in such a filtration device, since the resin layer 4 is provided on the surface of the plate-shaped body 1a on the filtrate collection chamber 5 side, the tubular filtration membrane 3 is provided. When backwashing is performed to eliminate the clogging of the resin layer 4, the backwashing pressure acts as a compressive stress in the resin layer 4. Therefore, the occurrence of cracks in the resin layer 4 during the backwash process can be suppressed.

Next, another embodiment will be described. An embodiment is also conceivable in which one end of each of the plurality of tubular filtration membranes 3 is closed while being freed, and each tubular filtration membrane 3 is held only on the other end side thereof. .

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing a filtration membrane module according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a filtration device including the module.

FIG. 3 is a horizontal sectional view showing a conventional filtration membrane module.

[Explanation of symbols]

 1a Plate-like body 3 Tubular filtration membrane 3a Opening 4 Resin layer 5 Filtrate collection chamber

Claims (1)

[Claims] 1. A filtrate collection chamber in which an opening (3a) of a tubular filtration membrane (3), one end of which is closed and the other end of which is open, has a peripheral wall partially formed by a plate-like body (1a). 5) in order to face into the plate with pass through, the tubular filtration membrane (3) the opening-side front end portion of the tubular filtration membrane (3) into a through hole provided in the plate-shaped body (1a) Shape (1a)
Provide a resin layer (4) that adheres and fixes in a sealed state to
A filtration membrane module with Te, filtration membrane module is provided wherein the resin layer (4) on the surface of the filtrate collection chamber (5) side of the plate-like body (1a).