WO2011148768A1 - Filtration membrane module - Google Patents

Abstract

A filtration membrane module is provided with flat plate-like headers (23) to which at least one end side of each filtration membrane (22) is affixed, and also with covers (25) which are formed in a housing-like shape and have openings liquid-tightly closed by the headers (23) to form collection chambers (28) for collecting filtered water filtered by the filtration membranes (22). The covers (25) are each provided with: a water conveyance path chamber (29) provided so as to bridge and connect the upper plate (34a) and the lower plate (34b) of the cover (25); a water collection opening (37) formed in the portion of the water conveyance path chamber (29) which is located on the collection chamber (28) side thereof; and discharge openings (27) formed in connection sections of the water conveyance path chamber (29) which are located at the upper plate (34a) and the lower plate (34b) of the cover (25). As a result, filtration membrane modules having such a configuration can be stacked in tiers inexpensively and easily, and the modules thus stacked in tiers have sufficient strength.

Description

Filtration membrane module

The present invention relates to a filtration membrane module used when treating purified water, sewage, industrial waste water, or the like.

Conventionally, when treating purified water, sewage, industrial wastewater, etc., a filtration membrane module composed of a plurality of tubular and plate-like filtration membranes (for example, ceramic membranes made of ceramic) has been used. The filtration membrane module includes, for example, a header that fixes at least one end of the filtration membrane and integrates a plurality of filtration membranes, and a header that includes a filtrate outlet is fixed to the header. Is known (for example, Patent Document 1). Moreover, the filtration membrane module in which the header was provided with the filtered water discharge port is also open | released (for example, patent document 2).

FIG. 7 shows a cross-sectional view of the filtration membrane module of Patent Document 1. In the filtration membrane module 1 of Patent Document 1, one end of a plurality of tubular filtration membranes 2 is housed in a long hole formed in the header 3. The cover 5 is liquid-tightly fixed to the header 3 by the fixing resin 4, covers one end opening side of the tubular filtration membrane 2, forms a water collection chamber 6 for collecting filtrate water, and the water collection chamber It has the discharge port 7 which discharges the filtrate water in 6 out of a module.

FIG. 8 is a cross-sectional view taken along line AA showing an example of a method for fixing the tubular filtration membrane 2 and the header 3 in Patent Document 1. As shown in FIG. 8, when the tubular filtration membrane 2 and the header 3 are fixed, a seal member 8 and an assembly jig member 9 are used on one end opening side of the tubular filtration membrane 2. When the fixing resin is injected into the header 3, the sealing member 8 prevents the fixing resin from entering the one end opening of the tubular filtration membrane 2.

Since the filtration membrane module 1 of this patent document 1 accommodates and fixes the tubular filtration membrane 2 in the long hole of the header 3, it can form a substantially plate-like filtration membrane from the several tubular filtration membrane 2 easily. it can. In addition, since the header 3 has a flat plate shape, it is easy to install the seal member 8 between the tubular filtration membrane 2 and the header 3. Further, the gap between the tubular filtration membrane 2 and the header 3 can be reliably sealed by the sealing member 8, and it is possible to reliably prevent the one end opening of the tubular filtration membrane 2 from being blocked by the fixing resin. .

FIG. 9 shows a schematic diagram of the filtration membrane module of Patent Document 2. The filtration membrane module 11 of Patent Document 2 is integrally fixed when the header 13 is formed in a state where a plurality of filtration membranes 12 formed in a plate shape are arranged.

The header 13 is supported at both ends by the upper plate 15a, the lower plate 15b, the side plates 15c, 15c surrounding the four sides (upper, lower, left and right) of one end of the integrally fixed membrane 12, and the upper plate 15a and the lower plate 15b. And a partition plate 14 that separates the filtration membranes 12 arranged in a row, and a discharge port 17 that is formed in the side wall 15 and discharges filtered water.

The header 13 forms a separate water collection chamber 16 corresponding to each filtration membrane 12 by a partition plate 14, and the filtered water filtered by each filtration membrane 12 flows into this individual water collection chamber 16. A part of the partition plate 14 is formed with a notch 19, and the notch 19 serves as a passage for guiding the filtrate in the individual water collecting chamber 16 to the collecting chamber 18. The collecting chamber 18 is formed by the partition plate 14, and the filtered water flowing into the collecting chamber 18 is discharged from the discharge port 17 to the outside of the module.

Thus, the header 13 of the filtration membrane module 11 in Patent Document 2 has not only the fixation of the filtration membrane 12 but also functions of the individual water collection chamber 16 and the collection chamber 18.

In the filtration membrane module 11 of Patent Document 2, since the filtrate outlet 17 is formed at the vertical position of the header 13 (upper plate 15a, lower plate 15b), when the filtration membrane modules 11 are stacked in multiple stages. Can be connected to each other through an O-ring. As a result, when the filtration membrane modules 11 are stacked in multiple stages, piping, connectors and the like are not necessary, and the filtration membrane modules 11 can be stacked in a multistage easily and inexpensively.

Moreover, since the outlet 17 for the filtrate water is formed at the vertical position of the header 13, the collecting chamber 18 can be used as a part of the piping when the filtration membrane modules 11 are stacked in multiple stages.

Furthermore, Patent Document 3 discloses a technique for integrating the header and the filtration membrane, and Patent Document 4 discloses a technique in which the header includes a collecting chamber.

However, the filtration membrane modules 1 and 11 of Patent Documents 1 and 2 have the following problems.

In the filtration membrane module 1 of Patent Document 1, the drainage port 7 of the filtrate formed in the cover 5 is located in the same direction as the one end opening of the filtration membrane 2. In other words, the discharge ports 7 could not be directly connected to each other. Therefore, when the filtration membrane module 1 is stacked in multiple stages, a pipe and a connector for connecting the pipe and the discharge port 7 are required, which increases the cost and makes the connection work complicated. It was. Moreover, since the cover 5 and the header 3 are face-to-face bonding, the bonding strength is likely to be reduced.

The header 13 of the filtration membrane module 11 of Patent Document 2 is integrally fixed to the filtration membrane 12, and is formed in a casing shape by a front panel, a rear panel, an upper plate 15a, a lower plate 15b, and side plates 15c, 15c. The The housing-like header 13 penetrates from the rear panel and is provided with a filtration membrane 12, and a partition plate 14 is erected on the front panel side to provide an individual water collection chamber 16 and a collection chamber 18 corresponding to each filtration membrane 12. Forming.

Therefore, the assembly chamber 18 has a simple configuration, and there is a concern about insufficient strength when the filtration membrane modules 11 are stacked in multiple stages. Moreover, in order to improve the strength of the header 13, it is necessary to make the back panel side of the header 13 robust, leading to an increase in cost.

In addition, since each filtration membrane 12 is partitioned by the partition plate 14 in which the notch 19 is formed, even when pressure is applied from the discharge port 17 when the filtration membrane 12 is washed, There was a possibility that the pressure could not be transmitted into the flow passage and the cleaning effect could not be expected sufficiently.

Furthermore, since the header 13 is not flat and has a complicated shape, it is complicated to provide the sealing member 8 for preventing the resin from entering between the header 13 and the filtration membrane 12 during casting.

For example, as shown in FIG. 10, a mold member 20 that forms a partition plate 14 and an individual water collection chamber 16 is prepared, and a seal member 8 is disposed at a tip portion of the mold member 20, and filtration is performed through the seal member 8. The one end opening of the film 12 has to be brought into contact with the tip of the mold member 20.

As described above, it is a main problem to provide a filtration membrane module that can be easily and multi-stacked at low cost and has sufficient strength when stacked in multi-stages.

JP 2006-15233 A International Publication No. WO2010 / 015374 JP 2005-125198 A JP-A-10-57775

The present invention has been devised in view of the above-described conventional problems. One aspect of the present invention is to filter the water to be treated by a plurality of filtration membranes having a membrane body on the outer peripheral surface and having flow passages formed therein. A filtration membrane module for discharging filtrate water out of the module, wherein the filtration membrane module is formed in a housing shape having a flat plate-like header that integrally fixes at least one end side of the plurality of filtration membranes, and an opening. The opening is liquid-tightly sealed to form a collection chamber of filtrate water filtered by a filtration membrane, and the cover straddles between an upper plate and a lower plate of the cover. A transfer water channel chamber to be installed; a water collection port formed on the collecting chamber side of the transfer water channel chamber; and a discharge port formed in the installation part of the transfer water channel chamber of the upper plate and the lower plate of the cover. It is characterized by.

Further, according to another aspect of the filtration membrane module of the present invention, the header is formed into a flat plate shape having a plurality of through holes by injection molding, molding, or machining, and the filtration membrane is formed in the through holes. One end is inserted, and the header and the filtration membrane are integrally fixed by a fixing resin.

Further, another aspect of the filtration membrane module of the present invention is characterized in that a flat header is formed on one end side of the filtration membrane by injection molding or molding.

Further, another aspect of the filtration membrane module of the present invention is characterized in that the transfer water channel chamber has a water collection port having a part of a peripheral wall thereof in contact with the header and opened to each collecting chamber side.

Further, another aspect of the filtration membrane module of the present invention is characterized in that a header is inserted into the cover, and the cover and the header are integrally fixed by a fixing resin.

Further, another embodiment of the filtration membrane module of the present invention is characterized in that the cover, header, and fixing resin are made of epoxy resin or polyurethane resin.

According to the present invention, it is possible to provide a membrane filter module that can be stacked in a low cost and easily, and that has sufficient strength when stacked in multiple stages.

The top view which shows an example of the filtration membrane module in this embodiment. Sectional drawing explaining an example of the connection method of the filtration membrane and header in this embodiment. Schematic which shows an example of the filtration membrane and header which were integrally fixed. The back side perspective view showing an example of the cover in this embodiment. Sectional drawing which shows an example of the method of installing a header and a filtration membrane in a cover. The front side perspective view which shows an example of the method of attaching the side panel in this embodiment to a cover. Sectional drawing which shows an example of the conventional filtration membrane module. Sectional drawing which shows an example of the fixing method of the conventional filtration membrane and a header. The front view which shows the other example of the conventional filtration membrane module. Sectional drawing which shows an example of the installation method of the sealing member in the conventional filtration membrane module.

Hereinafter, the filtration membrane module 21 in the present embodiment will be described with reference to the drawings.

1A is an exploded view of the filtration membrane module 21 in the present embodiment, and FIG. 1B is an assembly plan view of the filtration membrane module 21 in the present embodiment. As shown in FIG. 1, the filtration membrane module 21 in this embodiment includes a plurality of filtration membranes (for example, filtration membranes made of ceramic formed in a plate shape) 22 arranged at intervals, and a plurality of the filtration membranes. A flat plate-like header 23 fixed to at least one end of the filtration membrane 22, and attached to the back surface of the header 23 (the surface to which the ceramic membrane 22 is not fixed) so as to cover one end opening side of the filtration membrane 22. A pair of covers 25 and a pair of side panels 26 provided on the side surfaces of the plurality of integrated filtration membranes 22. The filtration membrane 22 may be tubular or plate-shaped as long as it has a film body on the outer peripheral surface and a flow passage is formed inside.

Examples of methods for integrally fixing the header 23 and the filtration membrane 22 include the following three methods (1) to (3).

(1) The header 23 is formed by drilling through holes (perforating by machining) in a flat resin such as PVC. The through hole is formed so that one end of the filtration membrane 22 can be inserted, and is formed at a predetermined interval. One end of the filtration membrane 22 is inserted into the through-hole, and the header 23 is filled with a fixing resin, and the filtration membrane 22 and the header 23 are integrally fixed.

(2) A through-hole (one end of the filtration membrane 22 is inserted from a liquid resin (for example, epoxy resin, polyurethane resin, etc.) at a predetermined interval by a molding means such as injection molding or molding (casting). A flat header 23 having a possible through hole) is molded. One end of the filtration membrane 22 is inserted into the through hole, and the header 23 is filled with a fixing resin, so that the header 23 and the filtration membrane 22 are integrally fixed.

(3) A liquid resin (for example, epoxy resin, polyurethane resin or the like) is molded at one end of the filtration membrane 22 by injection molding, molding (casting) or other molding means (integrated with the filtration membrane 22), A flat header 23 is formed integrally with the filtration membrane 22.

Here, based on the method of (3) above, details of a method for integrally fixing the plurality of filtration membranes 22 and the header 23 will be described.

First, as shown in FIG. 2, an intermembrane spacer 30 is sandwiched between a plurality of filtration membranes (for example, plate-like filtration membranes) 22, and the outer periphery of the filtration membrane 22 and the intermembrane spacer 30 is bound by a binding member 31. . Next, a seal member (for example, a silicon sheet) 33 that does not react with the header 23 made of resin is attached to the bottom inner walls of the pair of molds 32. The seal member 33 has a function of preventing the resin from entering one end opening of the filtration membrane 22.

Next, one end side of the filtration membrane 22 is accommodated from the opening side of one mold 32, and the filtration membrane 22 is in a state where one end of the filtration membrane 22 is in contact with the seal member 33 attached to the inner wall of the bottom of the mold 32. Is placed. Also, the other mold 32 is placed on the other end of the filtration membrane 22 with the opening facing downward, and the seal member 33 affixed to the other mold 32 and the other opening of the filtration membrane 22 are brought into contact with each other. Let

Next, for example, a pair of molds 32 are connected by connecting bolts 32 a and the like, and a liquid resin (for example, epoxy resin, polyurethane resin) is injected into the lower mold 32 to be solidified. A header 23 is formed. After the liquid resin is solidified, the filtration membrane 22 and the pair of molds 32, 32 are turned upside down to inject and solidify the liquid resin into the unfilled mold 32, and the header 23 is attached to the other end of the filtration membrane 22. To form. After the liquid resin is solidified, the binding member 31 and the intermembrane spacer 30 are removed from the filtration membrane 22.

The filtration membrane 22 of the filtration membrane module 21 of the present invention is not limited in width, thickness, length, number of applied sheets, etc., but in this embodiment, width: 115 mm, thickness: 7 mm, length: 440 mm, Number of applied sheets: 12 sheets.

As a result of the above procedure, headers 23 are formed at both ends of the filtration membrane 22 as shown in FIG. 3 ((a) side view, (b) plan view).

Next, a liquid resin (for example, epoxy resin, polyurethane resin, etc.) is injected into the cover 25 form (not shown), and the housing has an opening as shown in FIG. 4 (back side perspective view). The cover 25 is obtained.

The cover 25 is formed in a casing shape having an opening, and the opening is liquid-tightly sealed by the header 23 to form a filtrate water collecting chamber 28. Specifically, as shown in FIG. 4, the cover 25 includes a frame 34 formed in a rectangular shape in a longitudinal section so that the header 23 is fitted, a cover main body 35 provided on the frame 34, and the frame 34 has a transfer water channel chamber 29 that spans between the upper plate 34a and the lower plate 34b. The frame 34 is formed of an upper plate 34a, a lower plate 34b, and a pair of side plates 34c and 34c.

A contact portion A that contacts the header 23 is formed between the frame 34 and the cover main body 35 and in a part of the peripheral wall of the transfer water channel chamber 29. Further, a groove is formed between the frame 34 and the contact surface A as an injection portion 36 into which a fixing resin is injected.

A discharge port 27 for discharging filtered water to the outside is formed in the erection portion of the conveyance channel chamber 29 in the upper plate 34a and the lower plate 34b of the frame 34 (at the upper and lower ends of the conveyance channel chamber 29).

When the header 23 is fixed to the cover 25 formed as described above, as shown in FIG. 5, the back side of the header 23 (the side where the ceramic film 22 is not fixed) is connected to the back side of the cover 25. And is brought into contact with the contact surface A. Then, the fixing resin is injected from the injection portion 36 to be solidified, and the header 23 and the cover 25 are integrally fixed. The fixing resin is preferably the same resin as the header 23 and the cover 25.

At this time, the space surrounded by the header 23 and the cover 25 becomes a collecting water collecting chamber 28 flowing out from one end opening of the filtration membrane 22.

As described above, the contact wall A that contacts (adheres to) the header 23 is formed on the peripheral wall of the transfer water channel chamber 29, and is gathered by the contact surface A of the transfer water channel chamber 29. Chamber 28 is separated into two. Further, water collecting ports 37 are opened on both the collecting chambers 28 side of the transfer water channel chamber 29. The filtered water that has flowed into the two collecting chambers 28 from the filtration membrane 22 flows into the transfer water channel chamber 29 through the water collecting port 37, and is discharged from the discharge port 27 through the transfer water channel chamber 29.

FIG. 6 shows a front perspective view of the filtration membrane module 21 in the present embodiment. As shown in FIG. 6, a pair of side panels 26 is attached to the cover 25. On the front side of the cover 25, the frame 34 protrudes (for example, protrudes 8 mm) from the cover body 35, and the projection 41 is formed on the side of the side plates 34 c and 34 c of the frame 34 (on the cover body 28 side). Is formed.

The side panel (for example, a side panel made of SUS material having a thickness of 1 mm) 26 is formed by a side panel main body 42 and fitting portions 43 formed at both ends of the side panel main body 42. The fitting portion 43 is bent so as to cover the side plate 34 c of the frame 34, and a notch portion 44 that engages with the protruding portion 41 is formed. When the pair of side panels 26 are attached to the cover 25, the fitting portion 43 is fitted to the frame 34 and the protruding portion 41 of the cover 25. This prevents the side panel 26 from falling off the cover 25 due to vibration caused by the water flow.

Further, as shown in FIGS. 4 to 6, an O-ring groove 38 is formed in the discharge port (upper / lower end opening) 27 of the transfer water channel chamber 29. When the filtration membrane modules 21 are stacked in multiple stages, O-rings are fitted into the O-ring grooves 38, and the upper and lower filtration membrane modules 21 and 21 'are connected via the O-rings. Thereby, the upper and lower filtration membrane modules 21 and 21 ′ are stacked in a multistage manner with the transport water channel chamber 29 connected.

Hereinafter, the operation of the filtration membrane module 21 in the above configuration will be described.

During filtration operation, suction pressure is applied to the flow passages of the filtration membranes 22 through the discharge port 27, the transfer water channel chamber 29, and the collecting chamber 28 by a suction pump (not shown). As a result, a part of the water to be treated is sucked into the flow passage from the outside of each filtration membrane 22 and filtered, and is collected from one end opening of each filtration membrane 22 into the collecting chamber 28, the transfer water channel chamber 29, and the water collecting port. 37, through the discharge port 27 and discharged to the outside of the membrane filter module 21.

When backwashing is performed, backwash water is supplied from the outlet 27 to the filtration membrane 21 through the water collection port 37 and the collection chamber 28 from one end opening to the outside through the flow passage of each filtration membrane 21. It flows out and wash | cleans each filtration membrane 22. FIG.

The filtration membrane module 21 of this embodiment forms a collecting chamber 28 with a frame 34, a cover main body 35 surrounded by the frame 34, and a flat header 23. Here, the cover 25 is formed in a casing shape having an opening, and the flat header 23 is immersed and fixed in the cover 25. Therefore, compared with the membrane filter module 1 of Patent Document 1, Liquid-tight fixation between the cover 25 and the header 23 is facilitated, and the bonding strength between the cover 25 and the header 23 is not easily lowered. As a result, the header 23 and the cover 25 can be easily fixed, which contributes to the improvement of productivity.

Further, since the header 23 is a simple flat plate shape, it is easy to arrange the seal member 33 between the header 23 and the filtration membrane 22 and it can be surely sealed. As a result, the header 23 and the filtration membrane 22 can be easily fixed, which contributes to improvement in productivity.

Furthermore, since the flow passages of the individual filtration membranes 22 are opened to the collecting chamber 28 side, and a plurality of water collecting ports 37 are opened to the collecting chamber 28 side of the transfer water channel chamber 29, the back pressure from the discharge port 27 is increased. When the filtration membrane 22 is washed by applying pressure, the pressure applied to the transport water channel chamber 29 can be reliably applied to the flow passage of the filtration membrane 22, and a high washing effect can be expected. Further, by forming the abutting portion A in the transfer water channel chamber 29 and separating the collecting chamber 28 into two, it becomes easier to transmit a sufficient pressure to the flow passage of the filtration membrane 22 and a high cleaning effect can be expected. .

Further, in the filtration membrane module 21 of the present embodiment, a drain outlet 27 of the filtrate is formed at a position in the vertical direction of the header 23. Therefore, when the filtration membrane modules 21 are stacked in multiple stages, the mutual discharge ports 27 can be connected via the O-ring. As a result, the filtration membrane modules 21 and 21 'can be easily stacked in multiple stages.

Further, the cover 25 of the present embodiment has a housing shape, and is further fixed integrally with the header 23 along the cover body 35 (by the contact surface A formed around the cover body 35). Strength is obtained. Furthermore, since the transport water channel chamber 29 is formed in the cover 25 of the present embodiment, the strength can be improved as compared with the filtration membrane module 11 of Patent Document 2. Moreover, the contact surface A with the header 23 is formed in the conveyance channel chamber 29, and the contact surface A and the header 23 are bonded together, so that deformation between the header 23 and the cover 25 is suppressed. As a result, when the filtration membrane modules 21 and 21 'are stacked in multiple stages, the concern about insufficient strength of the cover 25 is solved.

Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

Claims (6)

A filtration membrane module that filters the water to be treated and discharges the filtered water out of the module by a plurality of filtration membranes having a membrane body on the outer peripheral surface and having flow passages formed therein,
A flat header that integrally fixes at least one end of the plurality of filtration membranes;
A cover that is formed in a casing shape having an opening, and the opening is liquid-tightly sealed by the header, thereby forming a collection chamber of filtrate water filtered by a filtration membrane,
The cover is
A transfer water channel room constructed between the upper plate and the lower plate of the cover,
A water collecting port formed on the collecting chamber side of the conveying channel chamber;
A filtration membrane module comprising: an upper plate of a cover; and a discharge port formed in a construction part of a conveyance channel chamber of a lower plate. The header is formed into a flat plate shape having a plurality of through holes by injection molding, molding, or machining.
The filtration membrane module according to claim 1, wherein one end of the filtration membrane is inserted into the through hole, and the header and the filtration membrane are integrally fixed by a fixing resin. The filtration membrane module according to claim 1, wherein a flat header is formed on one end side of the filtration membrane by injection molding or molding. 2. The filtration membrane module according to claim 1, wherein the transfer water channel chamber has a water collection port having a part of a peripheral wall thereof in contact with the header and opened to each collecting chamber side. The filtration membrane module according to claim 1 or 4, wherein a header is inserted into the cover, and the cover and the header are integrally fixed by a fixing resin. 2. The membrane filter module according to claim 1, wherein the cover, header, and fixing resin are made of epoxy resin or polyurethane resin.

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