WO2009081942A1

WO2009081942A1 - Spiral-type film module, and film filtering device using the same

Info

Publication number: WO2009081942A1
Application number: PCT/JP2008/073455
Authority: WO
Inventors: Takahisa Konishi; Kouji Maruyama; Toshiki Kouno; Keisuke Hirano; Akira Ootani; Hiroshi Yoshikawa; Norio Ikeyama; Yoshihiko Kondou
Original assignee: Nitto Denko Corporation
Priority date: 2007-12-26
Filing date: 2008-12-24
Publication date: 2009-07-02
Also published as: JP2009154072A; JP5107020B2

Abstract

Provided are a spiral-type film module capable of deciding the degree of deterioration for each film element by a simple method, and a film filtering device using the film module. In the spiral-type film module (50), spiral-type film elements (10) each having one or more of a separating film, a feeding-side passage member and a transmitting-side passage member wound around a porous, hollow center tube are connected in plurality and fitted in a pressure container. The spiral-type film module (50) is characterized by comprising a pressure sensor (33) for detecting a pressure level to be applied to the outer circumference portion of each of the spiral-type film elements (10), and a wireless tag (30) for transmitting the pressure level detected by the pressure sensor (33).

Description

Spiral membrane module and membrane filtration device using the same

In the present invention, a plurality of spiral-type membrane elements in which one or more of a separation membrane, a supply-side channel material and a permeate-side channel material are wound around a perforated hollow central tube are connected to each other in a pressure vessel. The present invention relates to a spiral-type membrane module loaded on a membrane and a membrane filtration device using the same.

Generally, a spiral membrane element (hereinafter also simply referred to as “membrane element”) is a perforated hollow shape in which a separation membrane unit including one or more of a separation membrane, a supply-side flow path material, and a permeate-side flow path material. It has a structure wound around a central tube (hereinafter also simply referred to as “central tube”) (see, for example, Patent Document 1).

FIG. 4 is a partially cutaway perspective view of a conventional membrane element. The membrane element 1 shown in this figure includes an envelope-like membrane (bag-like membrane) 4 in which separation membranes 2 are superimposed on both sides of a permeate-side flow passage material 3, and a net-like (net-like) supply-side flow passage material 6. The separation membrane unit is formed by spirally winding the outer peripheral surface of the central tube 5. Usually, an exterior material (not shown) is wound around the outer periphery of the wound body of the separation membrane unit.

When the membrane element 1 is used, the supply liquid 7 is supplied from one end face side of the membrane element 1. The supplied supply liquid 7 flows along the supply-side flow path member 6 in a direction parallel to the axial direction of the central tube 5 and is discharged as a concentrated liquid 9 from the other end face side of the membrane element 1. Further, the permeated liquid 8 that has permeated through the separation membrane 2 in the process in which the supply liquid 7 flows along the supply-side flow path material 6 passes through the permeation-side flow path material 3 along the permeation-side flow path material 3 as shown by the broken line arrow in the figure. It flows into the interior and is discharged from the end of the central tube 5.

In addition, the spiral membrane module generally has a structure in which a plurality of membrane elements as described above are connected and loaded in a pressure vessel. A membrane filtration apparatus is configured by holding one or a plurality of spiral membrane modules in a rack called a train, for example.

JP-A-10-137558

In this type of membrane filtration apparatus, the processing characteristics (pressure, permeate flow rate, liquid quality, etc.) are usually managed for each train. For example, in a configuration in which a large number of spiral membrane modules including a plurality of membrane elements are arranged in the train, the degree of contamination of the separation membrane differs depending on the position of each membrane element in the train. The new membrane element and the membrane element that can still be used are appropriately combined and accommodated in the train. That is, the arrangement and combination of the membrane elements are optimized so that the optimum processing performance can be finally exhibited in the entire train. However, at present, optimization is performed based only on the period of use, so that it cannot be said that the optimization is sufficiently performed.

In addition, whether or not to perform maintenance such as cleaning or replacement of the membrane element is determined based on the processing characteristics of each train. Therefore, depending on the membrane element, the maintenance is not always performed properly depending on the position and period of use. It may not be said that there is. That is, depending on the case, one of the membrane elements may be too late to perform maintenance, or maintenance may be performed at an earlier stage than necessary.

The present invention has been made in view of the above circumstances, and provides a spiral membrane module capable of determining the degree of deterioration for each membrane element by a simple method, and a membrane filtration device using the spiral membrane module.

The spiral membrane module of the present invention comprises a plurality of spiral membrane elements in which one or more of a separation membrane, a supply side channel material and a permeate side channel material are wound around a perforated hollow central tube. A pressure sensor for detecting a pressure value applied to an outer peripheral portion of each spiral membrane element and a wireless tag for transmitting the pressure value detected by the pressure sensor in the spiral membrane module loaded in the pressure vessel It is characterized by comprising.

According to the spiral membrane module of the present invention, the pressure value applied to the outer periphery of each membrane element (that is, the pressure value on the supply side) is detected by the pressure sensor, and the pressure value is transmitted by the wireless tag. Since the pressure value on the supply side that varies depending on the degree of contamination of the separation membrane can be detected from the outside, the degree of deterioration can be determined for each membrane element by a simple method. Also, the processing characteristics of each membrane element can be managed by storing data in the wireless tag in advance and reading the data from the outside. Therefore, management can be performed with higher accuracy based on data stored in the wireless tag and data obtained by the pressure sensor.

In the spiral membrane module of the present invention, the pressure sensor may be configured to receive power supply from the outside via the wireless tag. This is because it is not necessary to provide a separate power source for driving the pressure sensor, so that the module configuration can be simplified. As an example, a configuration in which the pressure sensor is supplied with electric power from the outside by electromagnetic induction through the wireless tag can be cited. In this case, the spiral membrane module of the present invention may further include a converter that converts the alternating current generated by the electromagnetic induction into a direct current and supplies the direct current to the pressure sensor. This is because a conventional pressure sensor driven by a direct current power source can be used, so that cost reduction is facilitated.

In addition, the membrane filtration device of the present invention is a membrane filtration device including one or more spiral membrane modules, wherein the spiral membrane module is the above-described spiral membrane module of the present invention.

Usually, in the membrane filtration device, the operation pressure is adjusted to keep the permeate amount constant, but when the membrane element in the pressure vessel is clogged at that time, the pressure loss increases accordingly, Even at the same operating pressure, the amount of permeate tends to decrease. In order to compensate for this, the operating pressure is increased to ensure the necessary amount of permeate. According to the membrane filtration device of the present invention, since the spiral membrane module of the present invention is provided, the pressure applied to each membrane element can be detected. Therefore, for example, the differential pressure between adjacent membrane elements can be detected when the membrane elements are connected in series. Accordingly, since it can be determined at which part in the membrane filtration device the differential pressure is greater, it is possible to accurately determine the degree of deterioration (blocking degree) of each membrane element by a simple method.

The membrane filtration device of the present invention may include a determination unit that determines the degree of deterioration of each spiral membrane element based on the pressure value transmitted from the wireless tag of the spiral membrane module. This is because the maintenance time of each membrane element can be appropriately determined.

In the membrane filtration device of the present invention, when the pressure sensor is configured to receive power supply from the outside via the wireless tag, a power supply unit that supplies power to the pressure sensor via the wireless tag May further be included. This is because it is easy to simplify the module configuration by providing a power supply unit for driving the pressure sensor outside the spiral membrane module. As an example, a configuration in which the power supply unit supplies power by electromagnetic induction via the wireless tag can be cited.

It is a schematic sectional drawing which shows an example of the spiral membrane module of this invention. It is the II sectional view taken on the line of the spiral membrane module of FIG. It is the schematic block diagram which showed the electrical structure for demonstrating an example of the membrane filtration apparatus of this invention. It is a partially cutaway perspective view of a conventional membrane element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Membrane element 16 Separation membrane unit 20 Center pipe 26 External wrap 28 Exterior material 30 Radio tag 31 Antenna 32 Converter 33 Pressure sensor 40 Pressure vessel 42 Interconnector 44 Concentrated liquid outlet 46 Permeate outlet 48 Supply liquid inlet 50 Spiral type membrane Module 60 Reader / writer 61 Power supply unit 62 Antenna 70 Control device 71 Determination unit 100 Membrane filtration device

The membrane element used in the spiral membrane module of the present invention has a structure in which one or more of a separation membrane, a supply-side channel material and a permeate-side channel material are wound around a perforated hollow central tube. Have. Such a membrane element is also described in detail in Patent Document 1 described above, and any of conventionally known separation membranes, supply-side flow channel materials, permeation-side flow channel materials, central tubes, and the like can be employed. For example, when a plurality of supply-side channel materials and permeation-side channel materials are used, a structure in which a plurality of membrane leaves are wound around the central tube is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the spiral membrane module of the present invention, and FIG. 2 is a cross-sectional view taken along line II of the spiral membrane module of FIG.

As shown in FIG. 1, the spiral membrane module 50 includes a plurality of membrane elements 10 loaded in a state of being connected in series in the pressure vessel 40. Adjacent membrane elements 10 are connected to each other via the central tube 20 and a tubular interconnector 42. The spiral membrane module 50 includes a wireless tag 30 provided on the outer periphery of each membrane element 10. As will be described later, the wireless tag 30 incorporates a pressure sensor 33 (see FIG. 3). The pressure sensor 33 is a pressure value applied to the outer peripheral portion of each membrane element 10 (that is, a pressure value on the supply side). ) Can be detected. Then, the pressure value detected by the pressure sensor 33 is transmitted by the antenna 31 (see FIG. 3) of the wireless tag 30, thereby changing depending on the degree of contamination of the separation membrane (not shown) included in the membrane element 10. Since the pressure value on the supply side can be detected from the outside, the degree of deterioration can be determined for each membrane element 10 by a simple method.

In the example shown in FIG. 1, the wireless tag 30 is provided on the outer peripheral portion of the concentration side end portion of each membrane element 10, but the present invention is not limited to this, and the supply side end portion, the central portion, etc. It may be provided at any position. However, in order to accurately manage the differential pressure between adjacent membrane elements 10, it is preferable to provide the wireless tag 30 at the same location in all the membrane elements 10.

The pressure vessel 40 is made of metal such as fiber reinforced plastic (FRP) or stainless steel, for example. In particular, fiber-reinforced plastic is preferable in order to easily realize wireless transmission. The thickness of the wall portion of the pressure vessel 40 may be of a level that does not hinder communication by the wireless tag 30 described later, and is, for example, about 10 to 80 mm. A supply liquid inlet 48 into which a supply liquid such as drainage or seawater flows is formed at one end of the pressure vessel 40, and the supply liquid flowing in from the supply liquid inlet 48 passes through the plurality of membrane elements 10. A purified permeate and a concentrated liquid are obtained. In addition, a permeate outlet 46 through which the permeate flows out and a concentrate outlet 44 through which the concentrate flows out are formed at the other end of the pressure vessel 40.

As shown in FIG. 2, the membrane element 10 has a separation membrane unit 16 wound around a central tube 20, and an outer wrap 26 is wound around the outer periphery of the wound body of the separation membrane unit 16. Yes. The outer wrap 26 is formed of a water resistant material such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), fiber reinforced plastic (FRP), and the like. The wireless tag 30 is fixed to the external wrap 26 with an adhesive or the like, and is covered with an exterior material 28 made of fiber reinforced plastic (FRP) or the like together with the external wrap 26. The thickness of the exterior material 28 may be a thickness that does not hinder communication by the wireless tag 30 described later, and is, for example, about 0.01 to 3 mm. According to the configuration of FIG. 2, the wireless tag 30 can be prevented from being exposed to the supply liquid. The installation location of the wireless tag 30 is not particularly limited as long as the pressure value applied to the outer peripheral portion of the membrane element 10 can be detected, and may be, for example, the outer peripheral side of the exterior material 28.

Next, an example of the membrane filtration device of the present invention will be described. FIG. 3 to be referred to is a schematic block diagram showing an electrical configuration for explaining an example of the membrane filtration device of the present invention. In the following description, the components of the spiral membrane module 50 described above will be used. However, the spiral membrane module that can be used in the membrane filtration device of the present invention includes the spiral membrane module 50 described above. It is not limited. In FIG. 3, the configuration includes one spiral membrane module. However, the present invention is not limited to this, and may include a plurality of spiral membrane modules.

3, the membrane filtration device 100 includes a reader / writer 60, a control device 70, and the like in addition to the spiral membrane module 50.

The control device 70 controls the operation of the reader / writer 60 and the like based on a setting value input by a user via an input means (not shown) such as a touch panel or a button or stored in advance in a memory. Further, as will be described later, the control device 70 includes a determination unit 71 that determines the degree of deterioration of each membrane element 10 based on the pressure value transmitted from the wireless tag 30. In addition, the control apparatus 70 can be normally implement | achieved by CPU, memory, etc.

The antenna 31, the converter 32, and the pressure sensor 33 are incorporated in the wireless tag 30. A power supply unit 61 and an antenna 62 are incorporated in the reader / writer 60. Further, the reader / writer 60 is provided outside the spiral membrane module 50 at a position close to each wireless tag 30. The distance between each reader / writer 60 and each wireless tag 30 may be a distance (for example, about 1 to 500 cm) that can transmit and receive data and the like. Communication between the wireless tag 30 and the reader / writer 60 is performed via the antenna 31 of the wireless tag 30 and the antenna 62 of the reader / writer 60. In the present embodiment, each reader / writer 60 is provided at a position close to each wireless tag 30. However, the present invention is not limited to this. For example, a plurality of wireless reader / writers may be used by using a movable reader / writer. It is good also as a structure which transmits / receives with respect to a tag by one reader / writer.

The pressure sensor 33 incorporated in the wireless tag 30 is supplied with electric power by electromagnetic induction from the power supply unit 61 incorporated in the reader / writer 60 via the antenna 31 of the wireless tag 30 and the antenna 62 of the reader / writer 60. At this time, the converter 32 incorporated in the wireless tag 30 converts the alternating current generated by the electromagnetic induction into a direct current and supplies it to the pressure sensor 33.

As the wireless tag 30, for example, a conventionally known RFID (Radio Frequency Identification) tag or the like in which a converter 32, a pressure sensor 33, or the like is incorporated can be used. For example, a conventionally known AC / DC converter or the like can be used as the converter 32. Further, the pressure sensor 33 is preferably one having low power consumption that can be driven by electric power supplied by electromagnetic induction. For example, a pressure sensor (trade name: Flexi Force, model: A201-25) manufactured by Nitta Corporation is used. Can be used.

As the reader / writer 60, for example, a conventionally known RFID tag reader / writer incorporating the power supply unit 61 or the like can be used. As the power supply unit 61, for example, an electromagnetic wave generator or the like can be used.

When determining the degree of deterioration of each membrane element 10 in the membrane filtration device 100, first, each reader / writer 60 applies each radio tag 30 of the corresponding membrane element 10 to each wireless tag 30 based on a command from the control device 70. A signal asking for a pressure value applied to the outer peripheral portion of the membrane element 10 is transmitted. Further, power is supplied from the corresponding power supply unit 61 to each pressure sensor 33. Each pressure sensor 33 detects a pressure value applied to the outer peripheral portion of the corresponding membrane element 10 and transmits the pressure value to the corresponding reader / writer 60 via the antenna 31 of the wireless tag 30. Subsequently, each reader / writer 60 transmits the pressure value from the corresponding pressure sensor 33 to the control device 70. Then, the determination unit 71 of the control device 70 determines the degree of deterioration of each membrane element 10 based on each pressure value. At this time, data such as position information and use period may be stored in each wireless tag 30 in advance, and each reader / writer 60 may read the data based on a command from the control device 70. Thereby, for example, the determination unit 71 calculates the differential pressure between the adjacent membrane elements 10, and when the value is equal to or greater than a predetermined threshold value, the display unit such as a display (not shown) of the membrane element 10 requiring maintenance is calculated. The position can be displayed. Further, each reader / writer 60 can track the change over time of each membrane element 10 by writing the obtained pressure value to each wireless tag 30 based on the command of the control device 70.

The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the pressure sensor is configured to receive power supply by electromagnetic induction from the power supply unit incorporated in the reader / writer, but the present invention is not limited to this, and a battery is separately provided, It is good also as a structure which drives a pressure sensor with a battery.

In the above embodiment, the pressure sensor and the converter are incorporated in the wireless tag. However, the present invention is not limited to this, and the pressure sensor, the converter, and the wireless tag may be arranged separately. In this case, the wireless tag and the converter do not need to be attached to the outer peripheral portion of the membrane element. For example, they are attached to an end surface holding member (seal carrier or telescope prevention member) provided at the end of the membrane element. An attached configuration may be used.

Claims

A spiral membrane element in which one or more of a separation membrane, a supply-side channel material and a permeation-side channel material is wound around a perforated hollow central tube is connected in a plurality and loaded into a pressure vessel. In the spiral membrane module
A pressure sensor for detecting a pressure value applied to the outer periphery of each spiral membrane element;
A spiral membrane module, comprising: a wireless tag that transmits a pressure value detected by the pressure sensor.
The spiral-type membrane module according to claim 1, wherein the pressure sensor is supplied with electric power from the outside via the wireless tag.
The spiral type membrane module according to claim 2, wherein the pressure sensor is supplied with electric power from the outside by electromagnetic induction through the wireless tag.
4. The spiral membrane module according to claim 3, further comprising a converter that converts an alternating current generated by the electromagnetic induction into a direct current and supplies the direct current to the pressure sensor.
In a membrane filtration apparatus including one or more spiral membrane modules,
The membrane filtration device according to any one of claims 1 to 4, wherein the spiral membrane module is the spiral membrane module according to any one of claims 1 to 4.
The membrane filtration device according to claim 5, further comprising a determination unit that determines a degree of deterioration of each spiral membrane element based on a pressure value transmitted from the wireless tag of the spiral membrane module.
The spiral membrane module is the spiral membrane module according to any one of claims 2 to 4,
The membrane filtration device according to claim 5 or 6, further comprising a power supply unit that supplies power to the pressure sensor via the wireless tag.
The membrane filtration device according to claim 7, wherein the power supply unit supplies power by electromagnetic induction through the wireless tag.