JP3820724B2 - Portable membrane separator - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
A portable membrane separation apparatus in which a raw water pump and a spiral membrane module are integrated is described in Japanese Patent Publication No. 7-90151.
[0003]
In the publication, there is no description of a specific example of the form of the spiral membrane module, and it is considered that a known spiral membrane module is used. The description will be given with reference.
[0004]
FIG. 5 is a partially exploded perspective view showing the structure of a conventional spiral membrane module. A plurality of bag-like separation membranes 2 are wound around the outer periphery of a water collecting pipe 1 via mesh spacers 3.
[0005]
The water collecting pipe 1 is provided with a slit-like opening that communicates the inside and outside of the pipe. The separation membrane 2 has a bag shape, and the central portion surrounds the water collecting pipe 1. A channel material 4 made of mesh spacers or the like is inserted into the bag-shaped separation membrane 2, and the inside of the bag-shaped separation membrane (bag-shaped membrane) 2 is a permeate channel.
[0006]
A top ring 6 and an end ring 7 are provided at both ends of the wound body 5 of the bag-like film 2, and a brine seal 8 is provided around the outer periphery thereof.
[0007]
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 as it is in the longitudinal direction of the wound body 5, and flows out as concentrated water from the rear end face of the wound body 5. . While flowing through this 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]
[Problems to be solved by the invention]
The conventional spiral membrane module of FIG. 5 has the following problems to be solved.
[0009]
(1) 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. However, if this is done, the diameter of the spiral membrane module will also increase.
{Circle around (2)} Since the permeated water that has permeated into the bag-like membrane 2 flows to the water collecting pipe 1 while rotating in the bag-like membrane 2 spirally, the flow resistance in the bag-like membrane 2 is large. Moreover, the flow resistance in the vicinity of the collecting pipe slit portion flowing into the collecting pipe 1 from the bag-like membrane 2 is also large.
(3) The flow rate of raw water flowing through the raw water flow path decreases toward the downstream side. (The raw water flow rate is reduced by the amount of the concentrated raw water.) For this reason, the raw water flow velocity is reduced in the downstream area of the raw water flow path, and dirt is likely to adhere.
[0010]
The present invention solves the above conventional problems, does not require a water collection pipe, can efficiently treat raw water with a spiral membrane module having low permeate flow resistance, and the overall configuration is compact. An object is to provide a portable membrane separation apparatus.
[0011]
[Means for Solving the Problems]
The portable membrane separation device of the present invention is a portable membrane separation device in which the raw water supply means and the spiral membrane module are integrated, wherein the spiral membrane module is wound around a shaft to form a wound body, 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.
[0012]
The spiral membrane module employed in the present invention is a spiral membrane module in which a permeate channel material is disposed inside a bag-shaped membrane, and a raw water channel material is disposed between the bag-shaped membranes, The bag-like membrane has a substantially rectangular shape having first, second, third and fourth sides, the first, second and third sides are sealed, and the fourth side is A 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 film to form a wound body. The raw water flow between the bag-like membranes with a side facing the rear end face of the wound body and a second side facing the fourth side facing the front end face of the wound body The entire third side portion of the path is sealed, and in the fourth side portion, a portion overlapping with the opening portion of the bag-like membrane is a closed portion, and the bag-like membrane is closed. Department and weight That place is that has become the open section.
[0013]
In such a spiral membrane module, raw water flows into the raw water flow path from the front end face of the wound body. This raw water flows through the raw water flow path in a direction substantially parallel to the winding body axis, and then flows out as concentrated water from the raw water flow path opening portion on the rear end face of the wound body.
[0014]
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 opening portion of the bag-like film on the rear end surface of the wound body.
[0015]
Thus, the permeated water flows in the bag-like membrane in a direction parallel to the axis of the wound body, so that the water collecting pipe used in the conventional spiral membrane module is not necessary. And the distribution | circulation resistance at the time of flowing in into this water collection pipe | tube from the bag-like film | membrane is lose | eliminated, and permeated-water distribution resistance becomes small.
[0016]
Since the water collecting pipe is eliminated, the length of the bag-like membrane in the winding direction can be increased by that much, and the membrane area can be expanded. And even if it enlarges the winding direction length of a bag-like film | membrane in this way, the distribution | circulation resistance of permeated water does not increase, and permeated water amount can be increased.
[0017]
In addition, since the raw water channel is opened only at a part of the rear end face of the wound body, the flow rate of the raw water (concentrated water) on the downstream side of the raw water channel can be increased as compared with the conventional method. It is possible to prevent adhesion of dirt in the downstream area of the road.
[0018]
In the present invention, by using such a spiral membrane module, the overall configuration of the portable membrane separator becomes compact.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the portable membrane separation apparatus according to the embodiment will be described with reference to FIGS. FIG. 6 is a schematic diagram showing a water flow system of the portable membrane separation device, and FIGS. 7 and 8 are perspective views of the portable membrane separation device.
[0020]
As shown in FIG. 6, a spiral-type membrane module 40 having a configuration shown in FIGS.
[0021]
The raw water is introduced into the pressure vessel 41 from the raw water inlet 53 of the pressure vessel 41 through the raw water port 50, the raw water pump 51 and the pipe (hose) 52, and subjected to membrane separation processing by the membrane module 40. The permeated water flowing out from the outer peripheral portion of the right end surface in FIG. 6 of the membrane module 40 is taken out through the permeated water outlet 61, the pipe (hose) 62, and the permeated water port 63. The concentrated water flows out into the socket 25 of the membrane module 40 and is taken out through a pipe (hose) 70 and the concentrated water port 71 connected to the socket 25.
[0022]
In order to backwash the membrane module 40, a pipe 80 is branched from the permeate pipe 62, and a compressor 81 is connected to the pipe 80. A pipe 85 branches from the raw water pipe 52, and a backwash drain port 86 is provided at the tip of the pipe 85.
[0023]
The pipes 52, 62, 70, 80 and 85 are provided with valves 54, 64, 72, 82 and 87, respectively.
[0024]
As shown in FIGS. 7 and 8, a pressure vessel 41 having the membrane module 40 is installed on a frame 91 that can be moved by a caster 90. The frame 91 protects the bracket 92 that supports the pressure vessel 41, the cover 93 that covers the pressure vessel 41, the switch box 94, the gauge box 95, and the valves 54, 64, 72, 82, and 87. A protective net 96 disposed on the frame 91 is provided. The cover 93 has a spare space 97.
[0025]
In addition, as shown in FIG. 8, each port 50, 63, 71, 86 is arrange | positioned under the frame 91, and each valve 54, 64, 72, 87 is arrange | positioned in the vicinity of each port 50, 63, 71, 86. Has been.
[0026]
In the switch box 94, a membrane separation operation switch, a backwash switch, and a controller that controls opening and closing of the valves 54, 64, 72, and 87 when these switches are operated are installed. In addition, 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 a gauge that displays the raw water pressure, the concentrated water pressure, and the permeated water pressure in the pressure vessel 41, an ammeter that indicates an energization current value to the pump 51 and the compressor 81 is installed.
[0027]
In order to perform the raw water treatment by this portable membrane separation device, the cable is pulled out from the reel in the switch box 94 and connected to a power source (commercial power source, portable generator, etc.). In addition, a raw water introduction hose is connected to the port 50 so that pond water, lake water, river water, well water, pool water, and the like can be fed into the membrane module 40 by the pump 51. A permeate collection hose and a concentrated water discharge hose are connected to the ports 63 and 71, and a backwash drainage hose is connected to the port 86.
[0028]
When the membrane separation operation switch in the switch box 94 is pushed, the valves 54, 64, 72 are opened, the valves 82, 87 are closed, and the raw water pump 51 is operated. Thereby, the raw water flows into the pressure vessel 41 from the pipe 52 and is subjected to membrane separation treatment by the membrane module 40, the permeate is taken out from the port 63 through the pipe 62, and the concentrated water is taken out from the port 71 through the pipe 70. leak.
[0029]
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 activated. As a result, air pressure is added to the permeate in the pressure vessel 41, the membrane module 40 is backwashed, and the backwash drainage flows out from the port 86 through the pipe 85. In this case, when the supply of air from the compressor 81 is started, the membrane module 40 is backwashed with water alone, and if the air supply is continued, the backwashing is performed by the gas-liquid mixed phase flow, and further the air supply is continued. Backwashing is performed only with air.
[0030]
Next, the spiral 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. 1B and 1C are cross-sectional views taken along lines BB and CC in FIG. 1A, respectively. 2 is a cross-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.
[0031]
As shown in FIG. 1, the bag-like film 10 has a square or rectangular shape, and includes a first side part 11, a second side part 12, a third side part 13, and a fourth side part 14. have. The separation membrane films 40 are bonded to each other by an adhesive or the like in the first side 11, the second side 12, and the third side 13, and only a part of the fourth side 14 is bonded. . As the bag-like film 10, a long film is folded back into two at the second side portion 12, and one of the first side portion 11, the third side portion 13, and the fourth side portion 14. The part may be bonded.
[0032]
From the middle of the fourth side 14 to the third side 13, the separation membrane films of the bag-like membrane 10 are not adhered to each other, and an open portion 30 for permeate outflow is formed. Moreover, the separation membrane films of the bag-like membrane 10 are bonded to each other from the middle of the fourth side portion 14 to the first side portion 11, thereby forming a closed portion 31 that prevents the permeated water from flowing out. Yes.
[0033]
A permeate channel material (for example, made of a mesh spacer) 15 is inserted and disposed in the bag-like membrane 10.
[0034]
An adhesive 16 is attached to one surface of the bag-like film 10 and adhesives 17 and 18 are attached to the other surface, and the bag-like film 10 is wound around the shaft 20. The adhesive 16 is attached along the first side 11, and the adhesive 17 is attached along the third side 13. The adhesive 18 is attached along the open portion 30 for flowing out the permeated water from the midway portion in the longitudinal direction of the fourth side portion 14 to the third side portion 13.
[0035]
By winding a plurality of bag-like membranes 10 around the shaft 20, the overlapping bag-like membranes 10 are joined in a watertight manner at the portions of the adhesives 17 and 18. Thereby, the raw | natural water flow path through which raw | natural water (and concentrated water) flows is comprised between bag-like membranes 10. FIG. When the adhesive 18 is cured, an open portion for outflow of raw water (concentrated water) is formed on the inner peripheral side and a closed portion for preventing raw water outflow is formed on the outer peripheral side on the rear end surface of the wound body. The
[0036]
A fin 19 extends from the boundary portion between the open portion 30 for permeate outflow and the closed portion 31 for permeate outflow prevention of the fourth side portion 14 toward the rear of the wound body. 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.
[0037]
As shown in FIG. 3, the wound body 24 is formed by winding the bag-shaped membrane 10 around the shaft 20 via a raw water flow path material (mesh spacer) 29 as shown in FIG. The fins 19 extend from the rear end surface of the wound body 24. By providing the fin 19 at the same location in the fourth side portion 14 of each bag-like film 10, the fin 19 is positioned on the same radius from the axis of the wound body 24, and the fin 19 overlaps. The fin 19 forms a ring-shaped protrusion. The rear end of the cylindrical socket 25 is inserted into the ring-shaped protruding portion, and the socket 25 and the fin 19 are joined with an adhesive or the like. The socket 25 may be externally fitted to the fin 19. Further, a slit groove may be provided on the rear end surface of the wound body 24 along the fin 19 with a lathe, and the end portion of the socket 25 may be embedded in the groove.
[0038]
By joining the socket 25 and the fins 19 in this manner, the permeated water outflow region on the outer peripheral side of the rear end surface of the wound body 24 and the concentrated water outflow region on the inner peripheral side of the socket 25 are partitioned.
[0039]
When the bag-like membrane 10 is wound around the shaft 20, as shown in FIG. 2, a raw water flow path material (mesh spacer) 29 is interposed between the bag-like membranes 10. By interposing these mesh spacers 29, a raw water flow path is configured.
[0040]
As shown in FIG. 4, a top ring 26 and an end ring 27 are formed on the front edge and the rear edge of the wound body 24 by a synthetic resin mold, respectively, and a brine seal 28 is provided around the outer periphery of the top ring 26.
[0041]
In the spiral membrane module configured in this manner, 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 axial center line of the wound body 24, and is taken out from the inner end face of the socket 25 at the rear end of the wound body 24. And while raw | natural water flows through a raw | natural water flow path in this way, water permeate | transmits in the bag-like film | membrane 10, and permeated water flows out from the outer peripheral side of the socket 25 among the rear-end surfaces of the winding body 24. FIG.
[0042]
In this spiral membrane module, the permeated water flows in the bag-like membrane 10 in the direction parallel to the axial center line of the wound body 24 and is taken out from the rear end surface, so that it is used in the conventional spiral membrane module. No water collection pipe is required. For this reason, there is no flow resistance when flowing from the bag-shaped membrane into the water collecting pipe, and the permeate flow resistance is significantly reduced.
[0043]
Note that the water collecting pipe is omitted, and the length of the bag-like membrane 10 in the winding direction can be increased correspondingly, and the membrane area can be increased. Even if the length of the bag-like membrane in the winding direction is increased, the permeate flow resistance does not increase, and the amount of permeate can be increased.
[0044]
In this spiral membrane module, the outlet portion of the raw water channel is provided only inside the socket 25, and the outlet (the most downstream portion) of the raw water channel is narrowed down. Also on the side, the flow rate of the raw water (concentrated water) becomes sufficiently large, and the adhesion of dirt in the downstream area of the raw water channel can be prevented. The inner area and the outer area of the socket 25 (the length of the adhesive 18 in the direction of the side 14) are preferably determined according to the water recovery rate of the spiral membrane module.
[0045]
In the spiral membrane module of FIGS. 1 to 4, the permeate 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. You may comprise as a water outflow part and the outer peripheral side of the socket 25 may be used as a concentrated water outflow part.
[0046]
【The invention's effect】
As described above, the portable membrane separation apparatus of the present invention is capable of membrane separation treatment of raw water very efficiently, and uses a high flux, low differential pressure spiral membrane module. Is small and compact.
[Brief description of the drawings]
1A is a perspective view of a bag-like membrane of a spiral membrane module used in a portable membrane separation apparatus according to an embodiment, and FIG. 1B is a sectional view taken along line BB in FIG. Sectional drawing and (c) figure are sectional drawings which follow the CC line of (a) figure.
2 is a cross-sectional view showing a method for winding a bag-like membrane of the spiral membrane module of FIG. 1. FIG.
3 is a perspective view showing an engagement relationship between a wound body of the membrane module of FIG. 1 and a socket. FIG.
4 is a side view of the spiral membrane module of FIG. 1. FIG.
FIG. 5 is a partially exploded perspective view showing the structure of a conventional spiral membrane module.
FIG. 6 is a system diagram of the portable membrane separation device according to the 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]
DESCRIPTION OF SYMBOLS 10 Bag-like film | membrane 11 1st edge part 12 2nd edge part 13 3rd edge part 14 4th edge part 15 Channel material 16, 17, 18 Adhesive 19 Fin 20 Shaft 24 Winding body 25 Socket 29 Mesh spacer 30 Permeated water outflow portion 31 Permeated water outflow blocking portion 40 Membrane module 41 Pressure vessel 51 Raw water pump 81 Compressor 90 Casters 91 Frame

Claims (2)

In the portable membrane separation device in which the raw water supply means and the spiral membrane module are integrated,
The spiral membrane module, a wound body by winding the film on the shaft, the raw water from one end face of the winding wound body is supplied, der Ru portable which permeate is withdrawn from the other end surface of the wound body A membrane separator ,
The membrane is a bag-like membrane having a permeate flow path material disposed therein, and the bag-like membrane is a substantially square shape having first, second, third and fourth sides, The second and third sides are sealed, the fourth side is partly open and the rest is closed.
In the spiral membrane module, a first side portion orthogonal to the fourth side portion is applied to a shaft to wind a bag-like membrane to form a wound body, and the fourth side portion is formed on the wound body. Facing the rear end face, facing the second side facing the fourth side to the front end face of the wound body,
In the raw water flow path between the bag-like membranes, the entire third side portion is sealed, and a portion overlapping with the open portion of the bag-like membrane is a closed portion in the fourth side portion. The portable membrane separation device is a spiral membrane module in which a portion overlapping the closed portion of the bag-like membrane is an open portion. Oite to claim 1, wherein the membrane is portable membrane separation device which is a fluororesin film.

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