JP2009066556A - Membrane device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane device capable of assuring a smooth flow of a treatment liquid and realizing a reduction of costs by avoiding the deformation of a treatment liquid passage by a tightening pressure even if a membrane supporting plate and a lid are made of an inexpensive general purpose resin. <P>SOLUTION: The membrane device 1 comprises a plurality of membrane modules 10 juxtaposed and each formed by arranging a planar membrane 102 on one side or both sides of a membrane supporting member 101. A treatment liquid discharge passage 103 is provided on at least one end side of the membrane supporting member 101. The sections of the treatment liquid discharge passages 103 of the membrane modules 10 are pressed inward from the direction perpendicular to the juxtaposing direction of the membrane modules, and the membrane modules 10 are fixed. The membrane supporting member 101 is molded from a general purpose resin. The treatment liquid discharge passage 103 is provided with a reinforcement member 16 for securing the cross-sectional area of the passage and an electric corrosion inhibiting means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a membrane device, and more particularly to a membrane device that can reliably secure a processing liquid flow path.

  Conventionally, as a membrane apparatus, the thing of patent document 1, 2 is known. In Patent Document 1, a plurality of membrane modules in which a flat membrane is disposed on one side or both sides of a membrane support are arranged in parallel, and a treatment liquid extraction flow path is provided on at least one end side of the membrane support. There is disclosed a membrane apparatus in which the membrane module is fixed by pressing a portion of the treatment liquid extraction flow path of the membrane module inward from a direction orthogonal to the direction in which the membranes are juxtaposed.

In Patent Documents 2 and 3, a flat membrane is disposed on one side or both sides of a membrane support, and a plurality of membrane modules each including a main body and a lid are arranged side by side. And a membrane device is disclosed in which the membrane module is fixed by pressing a portion of the treatment liquid extraction flow path of the plurality of membrane modules inward from a direction orthogonal to the direction in which the membranes are juxtaposed. Yes.
Japanese Patent No. 2538789 JP-A-6-218241 JP-A-9-57070

  In the membrane device described in Patent Document 1, when an inexpensive plastic material such as PVC is used for the membrane support plate, when a large number of juxtaposed plastic plates are pressed from both sides and tightened, the treatment liquid flow path is caused by the tightening pressure. There exists a problem which deform | transforms and inhibits the smooth flow of a process liquid.

  Also in the membrane devices described in Patent Documents 2 and 3, when an inexpensive plastic material such as PVC is used for the lid portion having the treatment liquid flow path, it is pressed and tightened from both sides in a state in which a large number are arranged in parallel. At this time, there is a problem that the treatment liquid flow path is deformed by the tightening pressure and the smooth flow of the treatment liquid is hindered.

  For this reason, membrane support plates and lids are generally formed using expensive reinforced resin materials such as engineering plastics that are excellent in strength, but such materials are more expensive than membranes, which makes membrane devices It is expensive.

  Therefore, the present invention can secure a smooth flow of the processing liquid without deforming the processing liquid flow path due to the tightening pressure even when an inexpensive general-purpose plastic is used for the membrane support plate and the lid, thereby reducing the cost. It is an object of the present invention to provide a membrane device that can be used.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A plurality of membrane modules in which a flat membrane is disposed on one side or both sides of the membrane support are provided side by side, and a treatment liquid extraction flow path is provided on at least one end side of the membrane support. In a membrane device in which the membrane module is fixed by pressing the portion of the extraction flow path from the direction orthogonal to the direction in which the membranes are arranged inward toward the inside,
A membrane apparatus, wherein the membrane support is made of general-purpose plastic, a reinforcing member made of a steel material that retains a cross-sectional area of the flow path is provided in the processing liquid take-out flow path, and an electrical protection means is applied.

(Claim 2)
A plurality of membrane modules each comprising a main body and a lid body are arranged side by side, the lid body has a processing liquid extraction flow path, and a portion of the processing liquid extraction flow path of the plurality of membrane modules is defined as a parallel arrangement direction of the membranes In the membrane device formed by pressing the membrane module from the direction orthogonal to the inside and fixing the membrane module,
A membrane apparatus, wherein the lid is made of general-purpose plastic, and a reinforcing member made of a steel material that retains a cross-sectional area of the flow path is provided in the processing liquid take-out flow path, and an electrical protection means is applied.

(Claim 3)
The membrane apparatus according to claim 1 or 2, wherein the steel material is carbon steel, and the electrical corrosion protection means is a cathodic protection system.

(Claim 4)
3. The membrane device according to claim 1, wherein the steel material is stainless steel, and the electrical corrosion protection means is an anode corrosion protection system.

(Claim 5)
The membrane device according to any one of claims 1 to 4, wherein the treatment liquid extraction flow path has a circular or slit shape in cross section.

(Claim 6)
The electrical anticorrosion means uses the reinforcing member as a working electrode, and conducts a conductive member that directly or indirectly contacts the reinforcing member as a counter electrode, and the conductive member is formed of a base metal than the reinforcing member. The membrane device according to claim 1, wherein

(Claim 7)
The said corrosion protection means has an electrolysis chamber which stores the processing liquid discharged outside, and the counter electrode formed with a base metal rather than the above-mentioned metal tube is immersed in this electrolysis chamber, and the above-mentioned reinforcement which becomes a working electrode 6. The membrane device according to claim 1, further comprising a power source that applies a negative potential to the member and applies a positive potential to the counter electrode.

(Claim 8)
8. The membrane apparatus according to claim 7, wherein a treatment liquid obtained by membrane filtration of seawater is electrolyzed in the electrolysis chamber, and the generated hypochlorous acid or a salt thereof is used for cleaning the membrane.

  According to the present invention, even if an inexpensive general-purpose plastic is used for a member having a treatment liquid flow path, a smooth flow of the liquid can be ensured without deformation of the treatment liquid flow path due to the tightening pressure, thereby reducing the cost. It is possible to provide a membrane device capable of achieving the above. That is, it is possible not only to prevent clogging of the processing liquid extraction flow path in the membrane apparatus such as a membrane filtration apparatus, a dialysis apparatus, and an electrolysis apparatus, but also to prevent corrosion of the reinforcing member made of a steel material by electrocorrosion prevention. At this time, by using carbon steel as the steel material, it is possible to provide a cell stack excellent in workability and economy.

  The membrane device of the present invention includes various membrane devices such as a membrane filtration device, a dialysis device, and an electrolysis device, and is not particularly limited as long as the treatment liquid take-out flow path may be deformed by the tightening pressure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an example of a membrane device according to the present invention.

  Reference numeral 10 denotes a membrane module, in which a flat membrane 102 is disposed on one side or both sides of the membrane support 101. In the following description, examples arranged on both sides will be described.

  A plurality of membrane modules 10 are arranged side by side. Although two are shown in the illustrated example, the number is not particularly limited, and can be determined as appropriate depending on the film area and the processing amount.

  Reference numeral 103 denotes a processing liquid outlet passage formed on at least one end side of the membrane support 101, and is formed on the lower end side in the illustrated example.

  The plurality of membrane modules 10 and 10 press the portion of the processing liquid extraction flow path 103 from the direction orthogonal to the parallel arrangement direction of the membrane inward (from both sides in the surface direction (left and right direction in the drawing) of the membrane module 10). Is fixed.

  Reference numeral 11 denotes a frame-like spacer for arranging a plurality of membrane modules 10 and 10 in parallel at regular intervals.

  In the membrane apparatus, a stock solution channel 13 is provided between a plurality of membrane supports 101, and openings 104 and 105 are formed above and below each membrane module 10.

  When the stock solution is supplied from the stock solution tank 14 into the membrane device by driving the circulation pump 15, the treatment solution passes through the flat membrane 102 and is discharged to the outside from the treatment solution extraction flow path 103.

  Reference numeral 16 denotes a reinforcing member for the processing liquid extraction flow path 103. The reinforcing member 16 is composed of a carbon steel metal tube. Therefore, it can be formed at low cost. The reinforcing member 16 prevents the shape of the processing liquid extraction flow path 103 from being deformed by pressing, and plays a role of maintaining the cross-sectional area of the flow path. Specifically, it can be realized by inserting a metal tube using carbon steel as a steel material into the treatment liquid extraction flow path 103.

  By installing such a metal tube, general-purpose plastic can be used for the membrane support 101, which contributes to cost reduction.

  In the present invention, the steel material may be stainless steel in addition to carbon steel. It is suitable for the film treatment of a highly corrosive fluid.

  In the present invention, in order to prevent corrosion of the steel material, it is important to have an electrical protection means. This is to provide durability to the membrane device itself. When the steel material is carbon steel, the electrical corrosion protection means is preferably a cathode corrosion protection system, and when the steel material is stainless steel, the electrical corrosion protection means is preferably an anode corrosion protection system.

  Below, the cathode corrosion protection system with respect to carbon steel is demonstrated as a preferable aspect of an electrical corrosion protection means.

  Specifically, an electrolytic chamber 18 is provided, and a processing liquid is introduced through a liquid collection pipe 17. A counter electrode 19 is provided in the electrolysis chamber 18 so as to be immersed in the processing liquid stored therein, and a positive potential is applied from the power source 20. The counter electrode 19 is formed of a metal having a lower potential than the metal used for the metal tube 16.

  Since each metal tube 16 serving as a working electrode is applied with a negative potential from the power supply 20, it is possible to transfer charges between the metal tube 16 and the counter electrode 19 via the treatment liquid. Anticorrosion.

  Even if a potential is always applied from the power source 20 to each metal tube 16 and the counter electrode 19, a very weak potential for anticorrosion purposes is sufficient, so compared to the case where an expensive hard material such as engineering plastic is used for the support plate 101, It is cheaper to reduce the cost by using an inexpensive material such as vinyl chloride resin for the support plate 101.

  FIG. 2 shows another embodiment for corrosion protection of the metal tube 16. Since the same reference numerals as those in FIG.

  This is a particularly preferable aspect when seawater is used as a stock solution and seawater is subjected to membrane treatment via the membrane device 1, and a liquid collection pipe 17 that collects a treatment liquid (seawater) discharged from each metal pipe 16. The branch pipe 21 is branched from the middle of the liquid flow path, and a part of the discharged processing liquid is stored in the electrolysis chamber 18.

  A counter electrode 19 is provided in the electrolysis chamber 18 so as to be immersed in a processing solution stored therein, and a positive potential is applied from a power source 20. The counter electrode 19 is formed of a metal having a lower potential than the metal used for the metal tube 16.

  Since each metal tube 16 serving as a working electrode is applied with a negative potential from the power supply 20, it is possible to transfer charges between the metal tube 16 and the counter electrode 19 via the treatment liquid. Anticorrosion.

In the electrolysis chamber 18, seawater is electrolyzed,
NaCl → Na ⁺ + Cl ⁻
Cl ⁻ + H ₂ O═HClO + H ⁺ + 2e ⁻
By the reaction, hypochlorous acid or a salt thereof is produced.

  Hypochlorous acid or a salt thereof generated in the electrolysis chamber 18 is taken out by the transfer pump 22 and can be supplied to the stock solution inlet via the transfer pipe 23. An open / close valve 24 opens and closes the transfer pipe 23.

  Therefore, according to this embodiment, when the membrane 102 is washed, the supply of the stock solution is stopped and the on-off valve 24 is opened and closed to supply hypochlorous acid or a salt thereof in the electrolysis chamber 18 into the membrane device. By cleaning 102, sterilization cleaning of the film 102 is facilitated.

  Next, another aspect of the present invention will be described.

  FIG. 3 is a schematic perspective view showing an example using a cartridge-type membrane module, and FIGS. 4A and 4B are cross-sectional views of the main part of the lid.

  A membrane module 10 composed of a main body 150 and a lid 151 is housed in a cartridge (not shown), and a plurality of them are arranged in parallel. In the drawing, only one sheet is shown for convenience.

  The plurality of membrane modules are fixed by pressing portions indicated by arrows in the drawing. A treatment liquid take-out flow path 103 is provided at a portion to be pressed of the lid 151, and the metal tube 16 is inserted therethrough.

  The metal tube 16 is subjected to anticorrosion treatment as shown in FIG. 1, but is omitted from the drawing.

  Due to the presence of the metal tube 16, the lid 151 can be formed of general-purpose plastic, which contributes to cost reduction. The material of the metal tube 16 is made of carbon steel.

  In the above description, the processing liquid extraction flow path 103 is not limited to a circular cross section, and may be slit.

  In the case of the slit shape, the inside of the slit can be reinforced using a plate-shaped carbon steel plate.

Schematic configuration diagram showing an example of a membrane device according to the present invention The figure which shows another aspect for corrosion-proofing the metal pipe | tube 16 Schematic showing an example using a cartridge-type membrane module Cross-sectional view of the main part of the lid

Explanation of symbols

1: Membrane device 10: Membrane module 11: Spacer 13: Stock solution flow path 14: Stock solution tank 15: Circulation pump 16: Reinforcement member (metal tube)
17: Collection pipe 18: Electrolytic chamber 19: Counter electrode 101: Membrane support 102: Flat membrane 103: Treatment liquid extraction flow path 104, 105: Opening 20: Power supply 21: Branch pipe 22: Transfer pump 23: Transfer pipe 24: On-off valve

Claims (8)

A plurality of membrane modules in which a flat membrane is disposed on one side or both sides of the membrane support are provided side by side, and a treatment liquid extraction flow path is provided on at least one end side of the membrane support. In a membrane device in which the membrane module is fixed by pressing the portion of the extraction flow path from the direction orthogonal to the direction in which the membranes are arranged inward toward the inside,
A membrane apparatus, wherein the membrane support is made of general-purpose plastic, a reinforcing member made of a steel material that retains a cross-sectional area of the flow path is provided in the processing liquid take-out flow path, and an electrical protection means is applied. A plurality of membrane modules each comprising a main body and a lid body are arranged side by side, the lid body has a processing liquid extraction flow path, and a portion of the processing liquid extraction flow path of the plurality of membrane modules is defined as a parallel arrangement direction of the membranes In the membrane device formed by pressing the membrane module from the direction orthogonal to the inside and fixing the membrane module,
A membrane apparatus, wherein the lid is made of general-purpose plastic, and a reinforcing member made of a steel material that retains a cross-sectional area of the flow path is provided in the processing liquid take-out flow path, and an electrical protection means is applied.   The membrane apparatus according to claim 1 or 2, wherein the steel material is carbon steel, and the electrical corrosion protection means is a cathodic protection system.   3. The membrane device according to claim 1, wherein the steel material is stainless steel, and the electrical corrosion protection means is an anode corrosion protection system.   The membrane device according to any one of claims 1 to 4, wherein the treatment liquid extraction flow path has a circular or slit shape in cross section.   The electrical anticorrosion means uses the reinforcing member as a working electrode, and conducts a conductive member that directly or indirectly contacts the reinforcing member as a counter electrode, and the conductive member is formed of a base metal than the reinforcing member. The membrane device according to claim 1, wherein   The said corrosion protection means has an electrolysis chamber which stores the processing liquid discharged outside, and the counter electrode formed with a base metal rather than the above-mentioned metal tube is immersed in this electrolysis chamber, and the above-mentioned reinforcement which becomes a working electrode 6. The membrane device according to claim 1, further comprising a power source that applies a negative potential to the member and applies a positive potential to the counter electrode.   8. The membrane apparatus according to claim 7, wherein a treatment liquid obtained by membrane filtration of seawater is electrolyzed in the electrolysis chamber, and the generated hypochlorous acid or a salt thereof is used for cleaning the membrane.

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