JP2009195824A - Antioxidation filtration filter, method for manufacturing antioxidation filtration filter, apparatus for manufacturing antioxidation filtration filter, and filtration apparatus having antioxidation filtration filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxidation-suppressing technique for a filter substrate which requires no water quality control and does not deteriorate the filtration function. <P>SOLUTION: The antioxidation filtration filter 20 is composed of a filter substrate 211 for composing a hollow fiber membrane filter part 21 for trapping a suspended solid matter in a suspension and an antioxidation metal film 22 formed on the surface of the filter substrate 211 and consisting of gold for eliminating active species. That is, active species are prevented from reaching the filter substrate 211 by forming the antioxidation metal film 22 and the filtration function of the filter substrate 211 is prevented from deterioration by forming such a layer limited to the surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for suppressing oxidation of a filter base material constituting a filtration filter for capturing suspended solids in a suspension.

  Conventionally, the quality of condensate water is intended to suppress oxidation of a base material (hereinafter referred to as “filter base material”) that constitutes a filtration filter applied to a condensate filtration device of a boiling water nuclear power plant. There is known a technique for controlling the oxidation of the filter base material by controlling the generation conditions of active species in condensate (see, for example, Patent Documents 1 and 2).

This technology for suppressing oxidation of the filter base material is that the oxidation of the filter base material is condensate due to corrosion of the main steam system and the condensate / water supply system equipment and piping of a so-called nuclear power plant such as a condenser and heat exchanger. Based on the knowledge that it is caused by active species such as hydroxy radicals produced by the reaction of metal ions generated from the eluted metal oxides and hydrazine, which is an oxygen scavenger added to the condensate for the purpose of preventing corrosion of equipment and piping. (For example, refer to Patent Document 3 and Non-Patent Document 1) This suppresses the generation of this active species.
JP 2003-53161 Japanese Unexamined Patent Publication No. 2007-160162 U.S. Pat.No. 4,804,527 Yamamoto K, et al., Site-specific DNA damage ind10ced by hydrazine in the presence of manganese and copper ions, J. Biol. Chem., (1991)

  In the conventional oxidation suppression technology, since the oxidation suppression of the filter base material is performed by water quality control, there is a problem that it involves a burden of water quality control and cannot be applied when it is necessary to keep the water quality constant. .

  This invention is made | formed in view of the said problem, and it aims at providing the oxidation suppression technique of the filter base material which does not require water quality control and does not reduce a filtration function.

  In order to solve the above problems, an antioxidant filter according to the present invention is formed on a filter base material constituting a filter for capturing suspended solids in a suspension, and on the surface of the filter base material. And an antioxidant metal film composed of a metal that eliminates active species that exert an oxidizing action on the filter substrate.

  Moreover, the manufacturing apparatus of the antioxidant filtration filter which concerns on this invention stores the metal particle which erase | eliminates the active seed | species which acts on the filter base material which comprises the filter filter which capture | acquires suspended solid content from suspension. A precoat tank and a precoat pump for injecting the metal particles into the suspension flow path so that the metal particles are adsorbed on the surface of the filter base material.

  Furthermore, in the method for producing an antioxidant filter according to the present invention, after setting a filter for capturing suspended solids from the suspension in the flow path of the suspension, the filter substrate constituting the filter is used as a filter base material. By injecting metal particles that eliminate the active species that exert an oxidizing action into the flow path during the first water flow to the filter, the metal particles are adsorbed on the surface of the filter base material. .

  The filtration device according to the present invention is formed on the surface of a filter filter that captures suspended solids from a suspension, and the filter base material that constitutes the filter, and has an activity of oxidizing the filter base material. And an antioxidant metal film made of a metal that erases seeds.

  ADVANTAGE OF THE INVENTION According to this invention, water quality control is unnecessary and it can suppress the oxidation of a filter base material, without reducing a filtration function.

  Embodiments of an antioxidant filter, a method for manufacturing an antioxidant filter, an apparatus for manufacturing an antioxidant filter, and a filter having an antioxidant filter according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a schematic diagram of a condensate / water supply system of a nuclear power plant 10 such as a boiling water nuclear power plant to which the antioxidant filter of the first embodiment is applied.

  In the nuclear power plant 10, as shown in FIG. 1, the steam generated from the reactor pressure vessel 11 passes to the condenser 14 through the main steam system from the high pressure turbine 12H → the moisture separator 13 → the low pressure turbine 12L. Then, the water is cooled and liquefied by the condenser 14 to be condensed water (suspension) containing suspended solids. Condensate passes through the condensate / feed water system from the condenser 14 to the condensate filtration device 15 to the condensate desalination device 16 to the low pressure feed water heater 17L, the deaerator 18 to the high pressure feed water heater 17H. Return to the pressure vessel 11. The structural material of the condenser 14, the low-pressure feed water heater 17L, and the high-pressure feed water heater 17L is made of a copper alloy having good heat transfer efficiency. In addition, the code | symbol 50 in FIG. 1 is a pump which respectively raises the pressure of the fluid of various systems.

  The main steam system and the condensate / feed water system equipment and piping of the nuclear power plant 10 are designed to prevent corrosion, and the main steam system and the condensate / feed water circulation water are degassed by the addition of hydrazine. PH adjustment control is performed by adding ammonia.

  The antioxidant filtration filter 20 of the first embodiment is applied to the condensate filtration device 15 of the nuclear power plant 10, and suspended solids such as metal oxides contained in the circulating water of the main steam system and the condensate / feed water system. Is used for purification of circulating water.

  FIG. 2 is a schematic diagram showing the structure of the antioxidant filtration filter of the first embodiment, (a) is a schematic diagram showing a part of a hollow fiber membrane filter part constituting the antioxidant filtration filter, and (b) is an antioxidant. FIG. 5C is a schematic diagram showing an external appearance of a filtration filter, and FIG. 5C is a schematic diagram showing a partial cross section in an arbitrary direction of the antioxidant filtration filter.

  The antioxidant filtration filter 20 of the first embodiment is stored in the filtration space of the condensate filtration device 15 and, as shown in FIGS. 2 (a) and 2 (b), a hollow fiber membrane filter constituting the filtration filter. The unit 21 and the antioxidant metal film 22 are provided.

  The hollow fiber membrane filter unit 21 has a filtration function of capturing suspended solids such as metal oxides from the condensate that passes through the hollow fiber membrane filter unit 21. The antioxidant metal membrane 22 has a function of protecting the hollow fiber membrane filter portion 21 from active species in the condensate and suppressing its oxidative deterioration.

  The hollow fiber membrane filter portion 21 of the antioxidant filtration filter 20 is composed of a filter base material 211 and a minute through hole 212 as shown in FIG.

  The filter base material 211 constituting the hollow fiber membrane filter portion 21 is made of a polyolefin-based material molded into a straw shape or a pipe shape (see FIG. 2 (a)). The suspended solids contained in the condensate are captured by the filter base material 211, and the inflow from the outer surface portion a to the hollow portion b is prevented. The purified water from which suspended solids have been removed passes through the micro through-hole 212, flows through the hollow portion b, and is guided to the condensate filtration device 15 outlet (not shown).

  As shown in FIGS. 2 (b) and 2 (c), the antioxidant metal membrane 22 of the antioxidant filtration filter 20 is formed on the filter substrate 211 with respect to the surface of the filter substrate 211 constituting the hollow fiber membrane filter portion 21. It is formed by depositing in layers a gold selected from among metals that eliminate the active species that exert an oxidizing action on 211.

The amount of gold deposition is set to a thin film of, for example, 1 μg / cm ^{2 in} consideration of maintaining the necessary functions of the hollow fiber membrane filter unit 21 such as maintaining the minute through holes 212 of the hollow fiber membrane filter unit 21. . Further, this vapor deposition treatment is performed before the first water flow to the condensate filtration device 15.

  Next, the operation of the antioxidant filtration filter 20 will be described.

  Here, the background art will be described before the description of the operation of the antioxidant filter 20 is started.

At present, the suppression of filter substrate oxidation applied to condensate filtration devices such as boiling water nuclear power plants, pressurized water nuclear power plants or thermal power plants is controlled by condensate water quality, and active species in condensate are controlled. This is done by suppressing the generation conditions.

  However, according to the technology for suppressing the oxidation of the filter base material, there is a demand for eliminating the need for water quality control in order to suppress the oxidation of the filter base material constituting the filter filter because of the burden of water quality control and the fluctuation of the water quality.

  One approach to meet the need for water quality control is to change the filter base material to a material that is not easily oxidized by active species, such as fluorine-based materials such as Teflon and polyvinylidene fluoride, and metal materials. A technique to improve the quality is also conceivable.

  However, if a technique based on modification of the filter base material is used with emphasis on suppressing the oxidation of the filter base material, the filtration function of the filtration filter is impaired, and it is impossible to achieve both the maintenance of the filtration function and the elimination of water quality control. In addition, it is disadvantageous in terms of price compared to the case of using a polyolefin-based material.

  Even if the active species are generated in the condensate that passes through the condensate filtration device, the present inventor can perform filtration when suppressing the oxidation of the filter base material so that the active species disappear in the vicinity of the filter base material. We focused on the point that water quality control can be eliminated without impairing the function. In addition, considering that the oxidation by the active species generated due to the metal oxide captured by the filter base material should be suppressed, the position where the active species disappears is closer to the filter base material. preferable.

  The present inventor configured the antioxidant filter of the first embodiment from the above-described background. In addition, as a technique for suppressing the oxidation of the filter base material, a technique for eliminating the active species in the vicinity of the filter base material has not been observed until now.

  Hereinafter, the action of the antioxidant filtration filter 20 will be described by dividing it into “antioxidation action” and “filtration function maintaining action”.

[antioxidant effect]
FIG. 3 is an explanatory view of the oxidation action depending on whether or not an antioxidant metal film is formed, (a) is an explanatory view of the oxidation action on the filter substrate when the antioxidant metal film is not formed, and (b) is an antioxidant metal. It is explanatory drawing of the antioxidant effect | action with respect to the filter base material at the time of forming a film | membrane. 3A, the right figure is an enlarged view of the left figure, and in FIG. 3B, the right figure is an enlarged view of the left figure.

  The oxidizing action of the active species on the filter base material 211 constituting the hollow fiber membrane filter portion 21 of the antioxidant filtration filter 20 is as follows.

  When hydrazine is added to the condensate for the purpose of preventing corrosion of main steam system and condensate / feed water system equipment and piping such as the condenser 14 of the nuclear power plant 10 (see FIG. 1), FIG. ), A hydrazine flow 33 is formed along the condensate flow 31 toward the filter base material 211 of the hollow fiber membrane filter section 21. Therefore, hydrazine passes through the vicinity of the copper oxide 32 that is eluted in the condensate due to corrosion of the main steam system and the condensate / feed water system equipment and piping and is captured by the filter base material 211. Since the copper ion concentration around the copper oxide 32 is high, an ion active species generation area 34 is formed, and hydrazine and copper ions react to easily generate active species such as hydroxy radicals. The generated active species reaches the filter base material 211 of the hollow fiber membrane filter unit 21 and oxidizes the filter base material 211. When this phenomenon occurs throughout the filter base material 211, the breaking strength / breaking elongation in the tensile test and the molecular weight are lowered, and the physical strength of the filter base material 211 decreases with time.

  In the antioxidant filtration filter 20 of the first embodiment, as shown in FIG. 3 (b), the active species are formed by the antioxidant metal film 22 formed on the surface of the filter substrate 211 of the hollow fiber membrane filter part 21. An erase area 35 is formed. For this reason, when the active species contained in the condensate approaches the filter base material 211, it interacts with the antioxidant metal film 22 and disappears, and does not reach the filter base material 211. Therefore, in the antioxidant filtration filter 20, the oxidation of the filter base material 211 of the hollow fiber membrane filter portion 21 due to the active species in the condensate is suppressed.

(Test results)
FIG. 4 is a diagram showing the difference in change over time in the breaking strength of the filter base material 211 depending on whether or not the antioxidant metal film 22 is formed.

  As shown in FIG. 4, the antioxidant filtration filter 20 (gold vapor deposition) in which the antioxidant metal film 22 is formed on the surface of the filter base material 211 (see FIG. 2) constituting the hollow fiber membrane filter portion 21 is an antioxidant metal. It can be seen that the breaking strength is unlikely to be reduced as compared with a filtration filter (no treatment) of only the hollow fiber membrane filter portion 21 in which the membrane 22 is not formed. This result is considered to be due to the disappearance of the active species generated in the liquid by the antioxidant action of the antioxidant metal film 22 of the antioxidant filter 20.

In addition, the comparison with time of the breaking strength shown in FIG. 4 is based on an oxidation degradation test using the Fenton reaction. In addition, this oxidation deterioration test was carried out by accelerating the oxidation reaction with active species generated by adding 0.1% of iron ions (Fe ²⁺ ) to a 3% hydrogen peroxide solution.

[Filtering function maintenance action]
In the antioxidant filtration filter 20, active species that exert an oxidizing action on the filter base material 211 disappear in the vicinity of the surface of the filter base material 211 constituting the hollow fiber membrane filter portion 21. Therefore, emphasis is placed on the suppression of oxidative deterioration of the hollow fiber membrane filter portion 21, and it is not necessary to select a material having excellent oxidation resistance as the material of the filter base material 211. That is, the material of the filter base material 211 can be selected with emphasis on the filtration function.

  The disappearance of the active species that exert an oxidizing action on the filter base material 211 of the hollow fiber membrane filter portion 21 is due to the antioxidant metal film 22 formed on the surface of the filter base material 211. Therefore, the fall of the filtration function of the hollow fiber membrane filter part 21 based on structural loss, such as the micro through-hole 212 of the hollow fiber membrane filter part 21, is suppressed.

  Next, the effect of the antioxidant filtration filter will be described.

  In the antioxidant filtration filter 20, the effects listed below can be obtained.

  (1) A filter base material 211 for constituting a hollow fiber membrane filter unit 21 for capturing suspended solids in condensate, and formed on the surface of the filter base material 211, and oxidizing the filter base material 211 Since the anti-oxidation filter 20 including the anti-oxidation metal film 22 made of a metal that eliminates the active species exerted thereon is configured, the active species contained in the condensate approaches the filter base material 211 to reach the anti-oxidation metal film 22. It disappears, and the filter base material 211 is not oxidized by the active species. That is, the oxidation of the filter base material 211 is suppressed regardless of the water quality of the condensate.

  In addition, the antioxidant metal film 22 is formed on the surface of the filter base material 211 constituting the hollow fiber membrane filter part 21. Therefore, modification of the structure or physical properties of the filter base material 211 is suppressed, and the required function of the hollow fiber membrane filter portion 21 is not impaired.

  As a result, water quality control is not required, and oxidation of the filter base material 211 can be suppressed without reducing the filtration function.

(2) The antioxidant metal film 22 of the antioxidant filtration filter 20 is formed by depositing the metal constituting the antioxidant metal film 22 on the surface of the filter base material 211 of the hollow fiber membrane filter part 21, Since the deposition amount is a thin film of 1 μg / cm ² , the filtration function maintaining action can be improved, and the effect of (1) can be obtained more reliably. Note that this filtering function maintaining effect can be obtained even deposition of the metal as ^{0.1μg / cm 2 ~10μg / cm 2} .

  (3) Since the metal constituting the antioxidant metal film 21 of the antioxidant filtration filter 20 is gold excellent in the action of erasing active species, the antioxidant action can be improved and the effect of (1) can be obtained more reliably. Can do.

[Second Embodiment]
The second embodiment is an example in which the configuration of the antioxidant metal film 22 of the first embodiment is modified.

FIG. 5 is a schematic view showing the structure of the antioxidant filtration filter 20A of the second embodiment, (a) is a schematic view showing a part of the hollow fiber membrane filter portion 21 constituting the antioxidant filtration filter 20A, and (b). Is a schematic diagram showing the appearance of the antioxidant filtration filter 20A, (c) is a diagram showing a partial cross section of the antioxidant filtration filter 20A in any direction.

  As shown in FIG. 5, the antioxidant filtration filter 20A of the second embodiment includes a hollow fiber membrane filter portion 21 and an antioxidant metal membrane 22A.

  As shown in FIGS. 5B and 5C, the antioxidant metal membrane 22A of the antioxidant filtration filter 20A is oxidized on the surface of the filter substrate 211 constituting the hollow fiber membrane filter portion 21 and is oxidized on the filter substrate 211. It is formed by adsorbing gold particles selected from among the metals that eliminate the active species that act. That is, gold is dispersed colloidally on the surface of the filter base material 211.

The adsorption amount of gold is set to 5 (μg / cm ² ), for example, and this adsorption treatment is performed before the first water flow to the condensate filtration device 15. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation of the antioxidant filtration filter 20A will be described.

  As shown in FIG. 4, an antioxidant filtration filter 20A (gold adsorption) in which gold particles are adsorbed on the surface of a filter substrate 211 constituting the hollow fiber membrane filter portion 21 is a hollow fiber that does not form an antioxidant metal film 22A. It can be seen that the breaking strength is less likely to be lower than that of the filtration filter having only the membrane filter portion 21 (no treatment).

  From this result, even the antioxidant metal film 22A formed of a colloidal thin film by adsorbing gold particles on the surface of the filter base material 211 of the hollow fiber membrane filter portion 21 is attributed to the active species in the condensate. Oxidation of the filter base material 211 is suppressed. Since other operations are the same as those of the first embodiment, description thereof is omitted.

  Next, the effect of the antioxidant filtration filter 20A will be described.

  In the antioxidant filtration filter 20A, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.

(4) The antioxidant metal membrane 22A of the antioxidant filtration filter 20A is formed on the surface of the filter base material 211 constituting the hollow fiber membrane filter portion 21 with the metal constituting the antioxidant metal membrane 22A having a particle state. Since it is formed by being adsorbed and the adsorbed amount is 5 μg / cm ² , the filtration function maintaining action can be improved, and the effect (1) described above can be obtained more reliably. This effect can be obtained similar effects to adsorption of the metal as ^{1μg / cm 2 ~100μg / cm 2} .

  (5) Since the metal constituting the antioxidant metal film 21A of the antioxidant filtration filter 20A is gold excellent in the action of erasing active species, the antioxidant action can be improved, and the effect of (4) can be obtained more reliably. Can do.

[Third Embodiment]
3rd Embodiment is related with the manufacturing apparatus 4 of the antioxidant filtration filter 20A (refer FIG. 5) of 2nd Embodiment.

  FIG. 6 is a view showing the manufacturing apparatus 4 for the antioxidant filtration filter 20A of the third embodiment.

  The production apparatus 4 is provided on the upstream side of the condensate filtration apparatus 15 that captures suspended solids such as metal oxides from the condensate in the condensate / feed water system of the nuclear power plant 10 (see FIG. 1). A precoat tank 41 and a precoat pump 42 are provided.

  In the manufacturing apparatus 4 for the antioxidant filtration filter 22A, the precoat tank 41 stores a solution containing gold particles. Further, the precoat pump 42 injects the solution in the precoat tank 41 into the condensate flow path L flowing into the condensate filtration device 15. As described in the first embodiment, the gold contained in the solution has an action of eliminating active species that exert an oxidizing action on the filter base material 211 constituting the hollow fiber membrane filter section 21.

  Next, the operation of the manufacturing apparatus 4 for the antioxidant filtration filter 22A will be described.

  By the precoat pump 42, the solution containing gold particles stored in the precoat tank 41 is connected to the condensate filtration device 15 in which the hollow fiber membrane filter unit 21 is stored and injected into the pipe L serving as a condensate flow path. Is done. A large number of hollow fiber membrane filter units 21 are housed inside the condensate filtration device 15, and the solution containing gold particles passes through the condensate flow to form a filter base constituting the hollow fiber membrane filter unit 21. It reaches the surface of the material 211 and adsorbs it. The gold particle injection operation by the manufacturing apparatus 4 is performed when the condensate filtration device 15 storing the hollow fiber membrane filter unit 21 is set to the condensate system and then the first water flow to the hollow fiber membrane filter unit 21 is performed. To do.

  Next, the effect of the manufacturing apparatus 4 will be described.

  In the manufacturing apparatus 4 of the third embodiment, the following effects can be obtained.

  (6) A precoat tank 41 that stores a solution containing gold particles that eliminate active species that exert an oxidizing action on the filter base material 211 that constitutes the hollow fiber membrane filter unit 21 that captures suspended solids from condensate. And a precoat pump 42 for injecting the solution into the pipe L connected to the condensate filtration device 15 storing the hollow fiber membrane filter portion 21 so that the gold particles are adsorbed on the surface of the filter base material 211. The anti-oxidation filter 20A manufacturing apparatus 4 including the above is configured, so that the condensate filtration apparatus 15 already provided in the condensate system is targeted, and the hollow fiber membrane filter unit 21 stored in the condensate filtration apparatus 15 is The antioxidant metal film 22A can be formed on the surface of the filter base material 211 to be configured.

  Further, even if the antioxidant metal film 22A formed on the surface of the hollow fiber membrane filter part 21 deteriorates or is lost during the filtration process of the condensate or during the cleaning of the hollow fiber membrane filter part 21, the condensate is recovered each time. By injecting the solution into the flow path, the antioxidant metal film 22A can be formed on the surface of the hollow fiber membrane filter portion 21. The effect of forming the antioxidant metal film 22A is that the gold particles themselves are stored in the precoat tank 41 instead of the solution containing the gold particles, and the gold particles are put into the pipe L which is a condensate flow path. Alternatively, it can be obtained by injecting. In this case, the gold particle injection mechanism may be a system that opens and closes the opening of the connecting portion with the pipe L instead of the precoat pump 42.

  (7) After providing the hollow fiber membrane filter part 21 which captures suspended solids from the condensate in the flow path of the condensate, the activity exerting an oxidizing action on the filter substrate 211 constituting the hollow fiber membrane filter part 21 By injecting a solution containing gold particles for eliminating seeds into the flow path at the time of the first water flow to the hollow fiber membrane filter portion 21, gold particles are put on the surface of the filter base material 211. Adsorbed gold particles suppress the reaction between the gold and the active species in the condensate before adsorbing the injected gold particles on the surface of the filter substrate 211, and the gold particles are efficiently applied to the surface of the filter substrate 211. Can be adsorbed. Note that this effect can be obtained by injecting into condensate having a low concentration of suspended solids, such as condensate into which dechlorinated water has been injected.

  As mentioned above, although this invention has been demonstrated based on 1st Embodiment-3rd Embodiment, about a specific structure, it is not restricted to this embodiment, and does not deviate from the summary of the invention which concerns on a claim As long as the design is changed or added, it is allowed.

  For example, in the present embodiment, an example in which the antioxidant metal film is made of gold has been shown. However, the metal constituting the antioxidant metal film may be a noble metal such as platinum or silver that erases active species. In particular, by using gold, platinum, or silver, active species that exert an oxidizing action on the filter substrate can be effectively eliminated.

  Moreover, although the example which comprises a hollow fiber membrane filter part from a polyolefin-type material was shown, you may comprise from a cellulose type, a cellulose acetate type, a polyamide type, a polyacrylonitrile type, a polyvinyl alcohol type, a polymethylmethacrylate type material. . By applying the polyolefin-based material, a hollow fiber membrane filter portion excellent in light weight, chemical resistance, flexibility, elasticity and the like can be configured.

  Moreover, although the example which comprises an antioxidant filtration filter using a hollow fiber membrane filter part was shown, the filtration filter which comprises an antioxidant filtration filter is not restricted to this, it is suspended solid from the suspension which lets water flow. Anything that captures minutes can be applied.

  In addition, an example in which the antioxidation filter is applied to a condensate filtration device of a nuclear power plant such as a boiling water nuclear power plant has been shown. However, a secondary system of a pressurized water nuclear power plant or a condensate of a thermal power plant is shown. It can also be applied to a purification system such as That is, any purification system including a filtration mechanism having a filtration filter that captures suspended solids from a suspension can be applied. 1 is replaced with a steam generator in a pressurized water nuclear power generation plan, and is replaced with a boiler as a steam generator in a thermal power plant.

1 is a schematic diagram of a condensate / water supply system of a nuclear power plant to which an antioxidant filtration filter according to a first embodiment is applied. It is a schematic diagram which shows the structure of the antioxidant filter of 1st Embodiment, (a) is a schematic diagram which shows a part of hollow fiber membrane filter part which comprises an antioxidant filter, (b) is antioxidant filter The schematic diagram which shows the external appearance of a filter, (c) is a schematic diagram which shows the partial cross section of the arbitrary directions of an antioxidant filtration filter. It is explanatory drawing of the oxidation action by the presence or absence of formation of an antioxidant metal film, (a) is an explanatory view of the oxidation action to the filter base material when not forming the antioxidant metal film, (b) is forming the antioxidant metal film Explanatory drawing of the antioxidant effect | action with respect to the filter base material in the case of doing. The figure which shows the difference of the time-dependent change of the breaking strength of the filter base material by the presence or absence of formation of an antioxidant metal film. It is a schematic diagram which shows the structure of the antioxidant filter of 2nd Embodiment, (a) is a schematic diagram which shows a part of hollow fiber membrane filter part which comprises an antioxidant filter, (b) is antioxidant filter The schematic diagram which shows the external appearance of a filter, (c) is a schematic diagram which shows the partial cross section of the arbitrary directions of an antioxidant filtration filter. The figure which shows the antioxidant filtration filter manufacturing apparatus of 3rd Embodiment.

Explanation of symbols

20, 20A Antioxidation filtration filter 21 Hollow fiber membrane filter part 22, 22A Antioxidation metal membrane 211 Filter base material 4 Antioxidation filtration filter manufacturing equipment 41 Precoat tank 42 Precoat pump

Claims (7)

A filter base material constituting a filtration filter for capturing suspended solids in a suspension;
An antioxidant metal film formed of a metal that is formed on the surface of the filter substrate and eliminates active species that exert an oxidizing action on the filter substrate;
An antioxidant filtration filter comprising: In the antioxidant filter according to claim 1,
The antioxidant metal film is formed by depositing the metal constituting the antioxidant metal film on the surface of the filter substrate, and the deposition amount is 0.1 μg / cm ^{2 to} 10 μg / cm ² . An antioxidant filtration filter characterized by that. In the antioxidant filter according to claim 1,
The antioxidant metal film is formed by allowing the metal constituting the antioxidant metal film to be adsorbed on the surface of the filter base material in the form of particles, and the adsorption amount is 1 μg / cm ^{2 to} 100 μg. Antioxidation filtration filter characterized by being / cm ² . In the antioxidant filter according to claim 1,
The anti-oxidation filtration filter, wherein the metal constituting the anti-oxidation metal film is at least one kind of noble metal selected from platinum, gold and silver. A precoat tank for storing metal particles that eliminate active species that exert an oxidizing action on a filter base material constituting a filter filter that captures suspended solids from a suspension;
A precoat pump for injecting the metal particles into the flow path of the suspension so that the metal particles are adsorbed on the surface of the filter base;
An anti-oxidation filter manufacturing apparatus comprising:   A filtration filter that captures suspended solids from the suspension is provided in the flow path of the suspension, and then metal particles that eliminate active species that have an oxidizing action on the filter base material constituting the filtration filter A method for producing an antioxidant filtration filter, wherein the metal particles are adsorbed on the surface of a filter base material by injecting the water into the flow path at the time of first water flow to the filtration filter. A filtration filter that captures suspended solids from the suspension;
An antioxidant metal film formed of a metal that is formed on the surface of the filter base material constituting the filtration filter and eliminates active species that exert an oxidizing action on the filter base;
A filtration apparatus comprising an antioxidant filtration filter.

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