JPH1028849A - Spiral type membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spiral type membrane module which does not need a water collection pipe and has small permeation water passage resistance by making a winding body by winding a bag-shaped membrane into which a channel material is inserted onto a shaft and dividing a raw water channel into a raw water outward route and a raw water backward route by a partition material which extends in the channel. SOLUTION: A channel material 15 is inserted into a bag-shaped membrane 10 in which side parts 11, 12, 13 are closed and a side part 14 is opened, and adhesives 16, 17, 18 are applied on one surface of the membrane 10. The membrane 10 is wound onto a shaft 20 to form a winding body 24, and a socket 25 is attached to the front end surface of the winding body 24. The adhesive 16 extends from a part of the side part 12 in the longitudinal direction of the shaft 20 to be a partition material which divides a raw water channel into a raw water outward route 21 and a raw water backward route by curing. When raw water is introduced from the end surface on the peripheral side of the socket 25 into the route 21 between the bag-shaped membranes 10, 10, the water is made to permeate the membrane 10 while passing through the raw water channel, and the permeation water is discharged from the back end surface of the winding body 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral type membrane module used for a membrane separation device such as a microfiltration device, an ultrafiltration device and a reverse osmosis membrane separation device.

[0002]

2. Description of the Related Art As a membrane module used in a membrane separation apparatus, there is a spiral type membrane module in which a separation membrane is wound around a water collecting pipe.

FIG. 5 is a partially exploded perspective view showing the structure of a conventional spiral membrane module.

A plurality of bag-shaped separation membranes 2 are wound around the outer periphery of a water collecting pipe 1 via a mesh spacer 3.

[0005] The water collecting pipe 1 is provided with a slit-shaped opening communicating with the inside and outside of the pipe. The separation membrane 2 has a bag shape,
The central part surrounds the water collection pipe 1. A channel material 4 made of a mesh spacer or the like is inserted inside the bag-shaped separation membrane 2, and the inside of the bag-shaped separation membrane (bag-shaped membrane) 2 is a permeated water channel.

[0006] A top ring 6 and an end ring 7 are provided at both ends of a wound body 5 of the bag-shaped membrane 2, and a brine seal 8 is provided around the outer periphery thereof.

The raw water flows into the raw water flow path between the bag-shaped membranes 2 from the front end face of the wound body 5 and flows in the longitudinal direction of the wound body 5 as it is, and the concentrated water flows from the rear end face of the wound body 5 Leaked as. While flowing through the raw water flow path, water permeates the bag-like membrane 2 and enters the inside thereof, flows into the water collecting pipe 1, and is taken out of the module from the rear end side of the water collecting pipe 1.

[0008]

The above-mentioned conventional spiral type membrane module has the following problems to be solved.

In order to increase the flow rate of the permeated water in the water collecting pipe 1, it is necessary to increase the diameter of the water collecting pipe 1, but in such a case, the diameter of the spiral membrane module becomes large.

The permeated water that has permeated into the bag-like membrane 2 is
Since the water flows into the water collecting pipe 1 while spirally rotating in the bag-shaped membrane 2, the flow resistance in the bag-shaped membrane 2 is large. Moreover,
The flow resistance near the slit portion of the water collecting pipe flowing into the water collecting pipe 1 from inside the bag-shaped membrane 2 is also large.

[0011] The flow rate of the raw water flowing through the raw water flow path decreases toward the downstream side. (The flow rate of the raw water is reduced by an amount corresponding to the concentration of the raw water.) For this reason, the flow velocity of the raw water is reduced in the downstream region of the raw water flow path, and dirt is easily attached.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a spiral-wound membrane module which does not require a water collecting pipe and has low permeated water flow resistance.

Another object of the present invention is to provide a spiral-wound membrane module that can increase the flow rate of raw water (concentrated water) even in the downstream region of the raw water flow path.

[0014]

The spiral-type membrane module of the present invention has a spiral membrane in which a permeated water flow path material is disposed inside a bag-like membrane, and a raw water flow path material is disposed between the bag-like membranes. In the mold membrane module, the bag-like membrane is a substantially rectangular shape having first, second, third, and fourth sides, and the first, second, and third sides are sealed, and 4 is an open portion, a first side perpendicular to the fourth side is applied to a shaft, and a bag-shaped membrane is wound to form a roll. Facing the rear end face of the wound body, facing the second side facing the fourth side to the front end face of the wound body,
The raw water flow path between the bag-shaped membranes is sealed at the third and fourth sides, and the raw water flow path is wound in a direction substantially parallel to the axis of the wound body. A raw material forward path and a raw water return path are defined by a partition member extending from the front end surface of the body to the middle of the wound body in the axial direction, and the raw water forward path and the raw water return path communicate with each other on the rear side of the wound body. The raw water outward path faces one of the outer peripheral side and the inner peripheral side of the front end face of the wound body, and the raw water return path is the outer peripheral side and the inner peripheral side of the front end face of the wound body. It is characterized by facing the other.

In such a spiral-wound membrane module, raw water flows into the raw water outward path from the outer peripheral side (or inner peripheral side) of the front end face of the wound body. This raw water flows in the raw water outward path in a direction substantially parallel to the axis of the wound body, and then reverses the flow direction,
It flows through the raw water return path and is on the inner side (or outer side) of the front end surface of the wound body
From the wastewater as concentrated water.

The water that has passed through the bag-like membrane flows in the bag-like membrane in a direction substantially parallel to the axis of the wound body, and flows out from an opening at the rear end face of the wound body.

As described above, since the permeated water flows in the bag-shaped membrane in a direction parallel to the axis of the wound body, the water collecting pipe used in the conventional spiral membrane module becomes unnecessary. Then, there is no flow resistance when flowing into the water collecting pipe from inside the bag-shaped membrane, and the flow resistance of permeated water is reduced.

Since the water collecting pipe is eliminated, the length of the bag-like membrane in the winding direction can be increased accordingly.
The membrane area can be expanded. And even if the length in the winding direction of the bag-like membrane is increased, the flow resistance of the permeated water does not increase,
The amount of permeated water can be increased.

In the present invention, it is preferable that the flow path widths of the raw water outgoing path and the raw water return path are made smaller toward the downstream side. By doing so, the flow rate of the raw water (concentrated water) on the downstream side of the raw water flow path can be increased as compared with the conventional case, and the adhesion of dirt in the downstream area of the raw water flow path can be prevented.

In the present invention, a plurality of bag-like membranes are wound around one shaft, and the partition member is interposed between one bag-like membrane and another bag-like membrane overlapping therewith. The same number of the partition members as the number of the bag-shaped membranes are provided, and the front ends of the partition members face the front end surface of the wound body, respectively, and are at the same radius from the axis of the wound body. It is preferable that a cylindrical socket, which is located and is continuous with the front end of the partition member, is connected to the front end face of the wound body coaxially with the wound body. The socket separates the inflow side of the raw water and the outflow side of the concentrated water.

In the present invention, fins are protruded from the position of the front end of the partition member in the second side of the bag-like membrane,
Preferably, the fin is joined to the socket. By doing so, the socket and the partition member are connected via the fins, and the inflow side of the raw water and the outflow side of the concentrated water are separated in a watertight manner.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a perspective view of one bag-like membrane used in the spiral membrane module according to the embodiment of the present invention and a shaft around which the bag-like membrane is wound. FIGS. 1B and 1C respectively show B in FIG. 1A.
It is sectional drawing which follows the -B line and CC line. FIG. 1D is a perspective view showing a configuration near D in FIG. 1A. FIG. 2 is a sectional view showing a method of winding a bag-like membrane around a shaft;
FIG. 3 is a perspective view showing an engagement relationship between the wound body and the socket, and FIG. 4 is a side view of the spiral membrane module.

The bag-like membrane 1 used in this embodiment
0 is a square or rectangular shape, and the first side 1
1, second side 12, third side 13, and fourth side 1
Four. This bag-shaped membrane 10 is formed by folding one long separation membrane film into two at the second side portion 12 and separating the separation membrane films folded at the first side portion 11 and the third side portion 13 from each other. The fourth side portion 14 is formed in a bag-like shape with an open port without bonding. A flow path material (for example, made of a mesh spacer or the like) 15 is inserted and arranged in the bag-shaped membrane 10. Note that the two separation membrane films are not folded in two at the second side portion 12 and the two separation membrane films are separated into the first side portion 11 and the second side portion 1.
The second and third sides 13 may be bonded.

On one surface of the bag-like film 10, an adhesive 1
6, 17, 18 are attached, and the bag-like membrane 10 is wound around the shaft 20. The adhesive 16 extends from an intermediate portion of the second side portion 12 in a direction substantially parallel to the longitudinal direction of the shaft 20. In this embodiment, the adhesive 16 is applied in a long strip shape, and is provided obliquely in a direction away from the first side 11 as the distance from the second side 12 increases.

The adhesive 17 is applied along the third side 13, and the adhesive 18 is applied along the fourth side 14.

By wrapping a plurality of bag-like films 10 around the shaft 20, the overlapping bag-like films 10 are joined to each other at the adhesives 16, 17, and 18 in a water-tight manner. Thereby, between the bag-shaped membranes 10 and 10,
A raw water flow path through which raw water (and concentrated water) flows in the order of arrows,. The adhesive 16 becomes a partitioning material that partitions the raw water flow path into the raw water forward path 21 and the raw water return path 22 by being cured.

In this embodiment, the second side 1
A fin 19 extends forward from a portion of the 2 facing the end of the adhesive 16. The fin 19 is made of, for example, a synthetic resin film or sheet, and
It is preferred to be bonded by bonding or the like.

By wrapping the bag-like membranes 10, 10,... Around the shaft 20, as shown in FIG.
Is formed. The fin 19 extends from the front end face of the wound body 24. By providing the fins 19 at the same location on the second side portion 12 of each bag-like membrane 10, the fins 19 are located on the same radius from the axis of the wound body 24, and the fins 19 overlap. The fin 19 forms a ring-shaped protrusion. The rear end of the cylindrical socket 25 is inserted into the ring-shaped protrusion, and the socket 25 and the fin 19 are joined with an adhesive or the like. Note that the socket 25 may be externally fitted to the fin 19. Alternatively, the fin 19 may be provided with a cutting groove using a lathe, and the socket 25 may be embedded in the groove.

By joining the socket 25 and the fins 19 in this manner, an inlet for raw water is formed on the outer peripheral side of the front end face of the wound body 24, and an outlet for concentrated water is formed on the inner peripheral side of the socket 25. It is formed.

As shown in FIG. 4, a top ring 26 and an end ring 27 are respectively formed on the front edge and the rear edge of the wound body 24 by a synthetic resin mold or the like, and a brine seal 28 is provided on the outer periphery of the top ring 26. Install around.

When the bag-like film 10 is wound around the shaft 20, as shown in FIG.
Mesh spacers 2 on the inner peripheral side and the outer peripheral side
9, 30 are interposed. With these mesh spacers 29 and 30 interposed, a raw water flow path is formed.

In the spiral membrane module configured as described above, as shown in FIG. 4, raw water flows into the raw water outgoing path 21 between the bag-like membranes 10 from the outer peripheral end face of the socket 25. This raw water flows through the raw water outward path 21 in a direction substantially parallel to the axis of the wound body 24, and then flows around the tip side of the adhesive 16 (partition material) as shown in FIG. 1 and flows into the raw water return path 22. Flows again in a direction parallel to the axis of the wound body 24 and is taken out from the inner end face of the socket 25. And while raw water flows through the raw water flow path in this way,
Water permeates into the bag-like membrane 10, and the permeated water flows out from the rear end face of the wound body 24.

In this spiral type membrane module, the permeated water flows in the bag-like membrane 10 in a direction parallel to the axis of the wound body 24 and is taken out from the rear end face. The used collecting pipe is unnecessary. For this reason, the flow resistance when flowing from the bag-like membrane into the water collecting pipe is eliminated, and the permeated water flow resistance is significantly reduced.

The water collecting pipe is omitted, and the length of the bag-like membrane 10 in the winding direction can be increased accordingly.
It is possible to increase the film area. Even if the length of the bag-like membrane in the winding direction is increased, the permeated water flow resistance does not increase,
The amount of permeated water can be increased.

In this embodiment, the raw water
The raw water return path 22 is configured such that the flow path width becomes smaller toward the downstream side. Therefore, the flow rate of the raw water (concentrated water) becomes sufficiently large also on the downstream side of the raw water flow path, and it is possible to prevent the adhesion of dirt in the downstream area of the raw water flow path.

Further, in this embodiment, the socket 25 is connected to the winding body 24 using the fins 19, and the connection strength between the socket 25 and the winding body 24 is high. Then, the inflow side of the raw water and the outflow side of the concentrated water are partitioned in a watertight manner by the socket 25.

In the above-described embodiment, the raw water inflow portion is arranged on the outer peripheral side of the socket 25 and the concentrated water outflow portion is arranged inside the socket 25.
5 may be used as the raw water inflow portion, and the outer peripheral side of the socket 25 may be used as the concentrated water inflow portion. However, in this case, the adhesive 16 is inclined in the opposite direction to that in FIG. 1, that is, so that the adhesive 16 gets closer to the first side 11 as the distance from the second side 12 increases.

[0038]

As described above, the spiral-wound membrane module of the present invention does not require a water collecting pipe and has low flow resistance of permeated water. Further, the membrane area can be increased, and even if the membrane area is increased, the permeated water flow resistance does not increase.

According to the present invention, it is also possible to increase the flow rate of the raw water (concentrated water) in the downstream area of the raw water flow path to prevent the adhesion of dirt in the downstream area of the raw water flow path.

[Brief description of the drawings]

FIG. 1A is a perspective view of a bag-like membrane according to an embodiment,
(B) is a sectional view taken along line BB of (a), (c) is a sectional view taken along line CC of (a), and (d) is (a).
It is a perspective view which shows the structure of D vicinity of the figure.

FIG. 2 is a cross-sectional view showing a method of winding a bag-like membrane of the spiral membrane module according to the embodiment.

FIG. 3 is a perspective view showing an engagement relationship between a wound body and a socket.

FIG. 4 is a side view of the spiral membrane module according to the embodiment.

FIG. 5 is a partially exploded perspective view showing the structure of a conventional spiral membrane module.

[Explanation of symbols]

 Reference Signs List 10 bag-like membrane 11 first side 12 second side 13 third side 14 fourth side 15 channel material 16, 17, 18 adhesive 19 fin 20 shaft 21 raw water outgoing path 22 raw water return path 24 Wound body 25 Socket 29, 30 Mesh spacer

Claims (1)

[Claims] 1. A spiral-type membrane module in which a permeated water flow path material is disposed inside a bag-shaped membrane and a raw water flow path material is disposed between the bag-shaped membranes. A substantially rectangular shape having second, third and fourth sides, wherein the first, second and third sides are sealed;
The fourth side is an open section, and a first side perpendicular to the fourth side is applied to a shaft to wind a bag-like membrane to form a roll, and the fourth side is formed. Part facing the rear end face of the wound body, a second side part facing the fourth side part facing the front end face of the wound body, and a raw water flow path between the bag-shaped membranes. Are sealed at the third and fourth sides, and the raw water flow path extends from the front end face of the wound body in a direction substantially parallel to the axis of the wound body. The raw water forward path and the raw water return path are divided by a partition member extending halfway in the direction of the core line, and the raw water forward path and the raw water return path communicate with each other on the rear side of the winding body. A spiral characterized in that it faces one of the outer peripheral side and the inner peripheral side of the front end face of the wound body, and the raw water return path faces the other of the outer peripheral side and the inner peripheral side of the front end face of the wound body. Mold membrane Lumpur.