JPH11207339A - Portable membrane separation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable membrane separation device capable of very efficiently performing a membrane separation treatment of raw water, for which a spiral type membrane module with a high flow flux and a low differential pressure is used and which is small-sized and compact in the structure of the whole device. SOLUTION: This portable membrane separation device is integrally formed as a wound body by winding a bag shaped separation membrane around a shaft, housing the spiral type membrane module 40 by which the raw water is fed from one end face of the wound body and transmitted water and concentrated water are taken out from the other end face of the wound body, in a pressure container 41, and attaching the pressure-container 41 and a raw water pump 51 to a frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable membrane separation device in which raw water supply means and a spiral membrane module are integrated.

[0002]

2. Description of the Related Art A portable membrane separation apparatus in which a raw water pump and a spiral membrane module are integrated is disclosed in Japanese Patent Publication No. Hei 7-9015.
No. 1 publication.

[0003] In the same publication, there is no description about a specific example of the form of the spiral membrane module, and a known spiral membrane module may be used.
Next, the configuration of a conventional spiral type membrane module will be described with reference to the drawings.

FIG. 5 is a partially exploded perspective view showing the structure of a conventional spiral type 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-like membranes 2 from the front end face of the wound body 5, flows in the longitudinal direction of the wound body 5 as it is, and concentrates 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 conventional spiral type membrane module shown in FIG. 5 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-shaped membrane 2 flows to the water collecting pipe 1 while spirally flowing through the bag-shaped membrane 2.
The flow resistance in the bag-like 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 the inside of the bag-shaped membrane 2 is large. The flow rate of the raw water flowing through the raw water flow path decreases toward the downstream side. (The flow rate of raw water decreases as much as the raw water is concentrated.)
For this reason, the raw water flow velocity is low in the downstream of the raw water flow path,
Dirt easily adheres.

[0010] The present invention solves the above-mentioned conventional problems, does not require a water collecting pipe, can efficiently treat raw water by a spiral type membrane module having low permeated water flow resistance, and has a compact overall configuration. It is an object of the present invention to provide a portable type membrane separation device.

[0011]

The portable membrane separation device of the present invention is a portable membrane separation device in which raw water supply means and a spiral type membrane module are integrated, wherein the spiral type membrane module has a membrane attached to a shaft. The wound body is wound, and raw water is supplied from one end face of the wound body, and permeated water is taken out from the other end face of the wound body.

The spiral-type membrane module employed in the present invention is 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. The bag-like membrane is substantially rectangular with first, second, third and fourth sides, and the first, second and third sides are sealed and the fourth A part of the side part is an open part and the remaining part is a closed part, and a first side part orthogonal to the fourth side part is applied to a shaft to wind a bag-like membrane to form a wound body, The fourth side faces the rear end face of the wound body, the second side facing the fourth side faces the front end face of the wound body, between the bag-shaped films. The raw water flow path of the third
The entire side of the bag-shaped membrane is sealed, and in the fourth side, a portion overlapping with the open portion of the bag-shaped film is a closed portion, and a portion overlapping with the closed portion of the bag-shaped film is open. It is preferably a part.

In this spiral type membrane module, raw water flows into the raw water flow path from the front end face of the wound body. The raw water flows through the raw water flow path in a direction substantially parallel to the axis of the wound body, and then flows out as concentrated water from the raw water flow path opening at the rear end face of the wound body.

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 the bag-shaped membrane 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 by that much.
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.

Also, since the raw water flow path is opened only at a part of the rear end face of the wound body, the flow rate of the raw water (concentrated water) downstream of the raw water flow path can be increased as compared with the conventional case. In addition, the adhesion of dirt in the downstream area of the raw water flow path can be prevented.

In the present invention, by using such a spiral type membrane module, the configuration of the entire portable type membrane separation apparatus becomes compact.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable membrane separation apparatus according to an embodiment will be described below with reference to FIGS. FIG. 6 is a schematic diagram showing a water flow system of the portable membrane separation device,
FIG. 8 is a perspective view of the portable membrane separation device.

As shown in FIG. 6, a pressure-resistant container 41 shown in FIG.
4 are installed.

The raw water is supplied to the raw water port 50 and the raw water pump 5
1. Introduced into the pressure-resistant container 41 from the raw water inlet 53 of the pressure-resistant container 41 via a pipe (hose) 52,
0 performs membrane separation processing. FIG. 6 of the membrane module 40
Permeate flowing out from the outer peripheral portion of the right end face of
1. It is taken out through a pipe (hose) 62 and a permeated water port 63. The concentrated water is supplied to the socket 2 of the membrane module 40.
5 and is taken out through a pipe (hose) 70 connected to the socket 25 and a concentrated water port 71.

In order to perform back washing of the membrane module 40, a pipe 80 branches off from the permeated water pipe 62,
Is connected to the compressor 81. A pipe 85 branches off from the raw water pipe 52, and a backwash drain port 86 is provided at the end of the pipe 85.

The pipes 52, 62, 70, 80, 8
5 are provided with valves 54, 64, 72, 82 and 87, respectively.

As shown in FIGS. 7 and 8, the membrane module 4 is mounted on a frame 91 movable by casters 90.
A pressure-resistant container 41 having 0 is provided. The frame 9 includes a bracket 9 for supporting the pressure-resistant container 41.
2, a cover 93 covering the pressure-resistant container 41, a switch box 94, a gauge box 95, and valves 54, 64, 7
A protection net 96 is provided on the frame 91 so as to protect 2, 82 and 87. The inside of the cover 93 is a spare space 97.

As shown in FIG. 8, each port 50,
63, 71, 86 are arranged at the lower part of the frame 91, and each valve 54, 64, 72, 87 is connected to each port 50, 63, 7
It is located near 1,86.

The switch box 94 is provided with a membrane separation operation switch, a backwash switch, and a controller for controlling opening and closing of the valves 54, 64, 72, and 87 when these switches are operated. A reel (not shown) around which a power cable is wound is installed in the switch box 94. In the gauge box 95, in addition to the gauges for displaying the raw water pressure, the concentrated water pressure and the permeated water pressure in the pressure vessel 41, the pump 51 and the compressor 8
An ammeter or the like that indicates the value of the current flowing through 1 is installed.

In order to treat raw water by this portable membrane separation device, a cable is drawn from a reel in the switch box 94 and a power source (commercial power source, portable generator, etc.) is used.
Connect to A hose for introducing raw water is connected to the port 50 so that pond water, lake water, river water, well water, pool water, etc. can be sent to the membrane module 40 by the pump 51. The ports 63 and 71 are connected to a hose for collecting permeated water and a hose for discharging concentrated water, and the port 86 is connected to a hose for discharging backwash drainage.

When the membrane separation operation switch in the switch box 94 is pressed, the valves 54, 64 and 72 are opened and the valves 82 and 87 are opened.
Is closed, and the raw water pump 51 operates. This allows
Raw water flows into the pressure-resistant container 41 from the pipe 52, is subjected to membrane separation processing by the membrane module 40, and permeated water is taken out from the port 63 via the pipe 62, and concentrated water flows out from the port 71 via the pipe 70.

When the backwash switch in the switch box 94 is operated, the valves 54, 64, 72 are closed, the valves 82, 87 are opened, and the compressor 81 is operated. This allows
Air pressure is applied to the permeated water in the pressure vessel 41, the membrane module 40 is backwashed, and the backwash drainage flows out of the port 86 via the pipe 85. In this case, when the air supply from the compressor 81 starts, the membrane module 4
When 0 is backwashed and air supply is continued, backwashing is performed by a gas-liquid mixed phase flow, and when air supply is continued further, backwashing is performed only with air.

Next, a spiral type membrane module used in the embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a perspective view of a bag-like membrane of the spiral membrane module 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. 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 a wound body and a socket, and FIG. 4 is a side view of a spiral membrane module.

As shown in FIG. 1, the bag-like film 10 has a square or rectangular shape.
, A third side 13, and a fourth side 14. In the first side 11, the second side 12, and the third side 13, the separation membrane films 40 are bonded to each other with an adhesive or the like, and only a part of the fourth side 14 is bonded. . In addition, as the bag-like film 10, one long film is folded in two at the second side 12, and one of the first side 11, the third side 13, and the fourth side 14 is formed. The parts may be bonded.

From the middle of the fourth side portion 14 to the third side portion 13
The separation membrane films of the bag-like membrane 10 are not adhered to each other, and the opening portion 30 for permeated water outflow is formed. Further, from the middle of the fourth side portion 14 to the first side portion 11, the separation membrane films of the bag-like membrane 10 are adhered to each other, forming a closing portion 31 for preventing outflow of permeated water. I have.

A permeated water channel material (for example, made of a mesh spacer) 15 is inserted and arranged in the bag-like membrane 10.

On one surface of the bag-like film 10, an adhesive 1
6 is adhered and adhesives 17 and 18 are adhered to the other surface, and the bag-like film 10 is wound around the shaft 20. The adhesive 16 is applied along the first side 11, and the adhesive 17 is applied along the third side 13. The adhesive 18 is applied along the opening 30 for outflow of permeated water from the intermediate portion in the longitudinal direction of the fourth side portion 14 to the third side portion 13.

By winding a plurality of bag-like films 10 around the shaft 20, the overlapping bag-like films 10 are joined to each other at the portions of the adhesives 17 and 18 in a watertight manner. Thus, a raw water flow path through which raw water (and concentrated water) flows is formed between the bag-shaped membranes 10. As the adhesive 18 cures, an open portion for flowing out the raw water (concentrated water) is formed on the rear end surface of the wound body on the inner peripheral side, and a closing portion for preventing raw water outflow is formed on the outer peripheral side. You.

Fins 19 extend from the boundary between the open portion 30 for permeate outflow and the closed portion 31 for permeate outflow prevention in the fourth side portion 14 toward the rear of the wound body. I have. The fins 19 are made of, for example, a synthetic resin film or sheet, and are preferably bonded to the bag-like film 10 by adhesion or the like.

By winding the bag-like membrane 10 around the shaft 20 via a raw water flow path material (mesh spacer) 29 as shown in FIG. 2, a wound body 24 is formed as shown in FIG. The fin 19 extends from the rear end face of the wound body 24. By providing the fins 19 at the same location on the fourth side portion 14 of each bag-like film 10, the fins 19
Are located equiradially from the axis of the winding body 24 and
The fins 19 form a ring-shaped protrusion by overlapping the 9. 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. Also, fin 1
A cutting groove may be formed on the rear end face of the wound body 24 along the line 9 by a lathe, and the end of the socket 25 may be embedded in the groove.

By joining the socket 25 and the fin 19 in this manner, a permeated water outflow area on the outer peripheral side of the rear end face of the wound body 24 and a concentrated water outflow area on the inner peripheral side of the socket 25 are defined. .

When the bag-like film 10 is wound around the shaft 20, as shown in FIG.
A raw water flow path material (mesh spacer) 29 is interposed between them. The raw water flow path is formed by interposing these mesh spacers 29.

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

In the spiral membrane module configured as described above, the raw water flows from the front end face of the wound body 24 into the raw water flow path between the bag-like membranes 10 as raw water. This raw water flows through the raw water flow path in a direction substantially parallel to the axis of the wound body 24, and is taken out from the end face inside the socket 25 at the rear end of the wound body 24. Then, while the raw water flows through the raw water flow path, the water permeates into the bag-like membrane 10, and the permeated water flows out from the outer peripheral side of the socket 25 on the rear end surface 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.

Note that 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 spiral membrane module, the outlet portion of the raw water flow path is provided only inside the socket 25, and the outlet (the most downstream portion) of the raw water flow path is narrowed. The flow rate of the raw water (concentrated water) becomes sufficiently large also on the downstream side of the road, and the adhesion of dirt in the downstream area of the raw water flow path can be prevented. The area inside and outside the socket 25 (the length of the adhesive 18 in the side portion 14 direction) is preferably determined according to the water recovery rate of the spiral membrane module.

In the spiral type membrane module shown in FIGS. 1 to 4, the permeated water outflow portion is arranged on the outer peripheral side of the socket 25 and the concentrated water outflow portion is arranged inside the socket 25. The inside may be configured as a permeated water outflow portion, and the outer peripheral side of the socket 25 may be configured as a concentrated water outflow portion.

[0046]

As described above, the portable type membrane separation device of the present invention is capable of extremely efficient membrane separation of raw water, and uses a high flux, low differential pressure spiral type membrane module. Thus, the configuration of the entire apparatus is small and compact.

[Brief description of the drawings]

FIG. 1A is a perspective view of a bag-like membrane of a spiral membrane module used in a portable membrane separation device according to an embodiment, and FIG. 1B is a view taken along line BB in FIG. Sectional view,
FIG. 3C is a cross-sectional view taken along line CC in FIG.

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

FIG. 3 is a perspective view showing an engagement relationship between a wound body and a socket of the membrane module of FIG. 1;

FIG. 4 is a side view of the spiral membrane module of FIG. 1;

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

FIG. 6 is a system diagram of a portable membrane separation device according to an embodiment.

FIG. 7 is a perspective view of a portable membrane separation device according to an embodiment.

FIG. 8 is a perspective view of a portable membrane separation device according to an embodiment.

[Explanation of symbols]

 Reference Signs List 10 bag-like membrane 11 first side 12 second side 13 third side 14 fourth side 15 flow path material 16, 17, 18 adhesive 19 fin 20 shaft 24 wound body 25 socket 29 Mesh spacer 30 Open part for permeated water outflow 31 Closed part for permeated water outflow prevention 40 Membrane module 41 Pressure-resistant container 51 Raw water pump 81 Compressor 90 Caster 91 Frame

Claims (3)

[Claims] 1. A portable membrane separation device in which raw water supply means and a spiral membrane module are integrated, wherein the spiral membrane module winds a membrane around a shaft to form a wound body, Raw water is supplied from the end face,
A portable membrane separation device, wherein permeated water is taken out from the other end surface of the wound body. 2. The bag according to claim 1, wherein the membrane is a bag-like membrane in which a permeated water channel material is disposed, and the bag-like membrane is a first membrane.
It is a substantially rectangular shape having second, third and fourth sides, the first, second and third sides are sealed, the fourth side is partially open, and the remainder is The spiral-type membrane module is a closed part, and the first side part orthogonal to the fourth side part is applied to a shaft to wind a bag-like membrane into 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. The third side portion is entirely sealed, and in the fourth side portion, a portion overlapping with the open portion of the bag-shaped film is a closed portion, and the closed portion of the bag-shaped film is closed. A portable membrane separation device, characterized in that it is a spiral-wound membrane module in which an overlapped portion is an open part. 3. The portable membrane separation device according to claim 1, wherein the membrane is a fluororesin membrane.