WO2020261883A1 - Dispositif de filtration pour traitement de l'eau - Google Patents

Dispositif de filtration pour traitement de l'eau Download PDF

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Publication number
WO2020261883A1
WO2020261883A1 PCT/JP2020/021564 JP2020021564W WO2020261883A1 WO 2020261883 A1 WO2020261883 A1 WO 2020261883A1 JP 2020021564 W JP2020021564 W JP 2020021564W WO 2020261883 A1 WO2020261883 A1 WO 2020261883A1
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WIPO (PCT)
Prior art keywords
water treatment
filter medium
filtration
water
fiber filter
Prior art date
Application number
PCT/JP2020/021564
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English (en)
Japanese (ja)
Inventor
藤田　浩史
純矢 小川
廣田　達哉
慶信 嶋山
Original Assignee
パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2020261883A1 publication Critical patent/WO2020261883A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/04—Organic material, e.g. cellulose, cotton
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage

Definitions

  • This disclosure relates to a filtration device for water treatment.
  • Patent Document 1 Conventionally known is a water treatment filtration device that purifies the water to be treated using a filtration filter.
  • a filtration device for water treatment of this type the one disclosed in Patent Document 1 has been proposed.
  • Patent Document 1 a cartridge type filtration filter is used, and when the purification ability of the filtration filter is lowered due to clogging or the like, it can be replaced with a new filtration filter.
  • the purification capacity of the water treatment filtration device is suppressed from being lowered by periodically replacing the filtration filter.
  • Patent Document 2 a filtration device for water treatment disclosed in Patent Document 2 has also been proposed.
  • Patent Document 2 by reusing the filtration filter, it is possible to suppress an increase in running cost when the water treatment filtration device is used for a long period of time.
  • the conventional filtration device for water treatment could not suppress the increase in running cost during long-term use while simplifying the configuration.
  • An object of the present disclosure is to provide a water treatment filtration device capable of suppressing an increase in running cost while simplifying the configuration.
  • the water treatment filtration device is provided with a filtration container portion through which the water to be treated can pass and the inside of the filtration container portion to allow the water to be treated. It is provided with a filtration unit for filtering. Further, the water treatment filtration device is arranged in the filtration unit, and the fiber filter medium which can be taken in and out of the inside of the filtration container unit and the fiber filter medium arranged in the filtration unit are pressed in a compressed state. It is provided with a member.
  • the filtration container portion has a container body portion formed with an opening through which the holding member can be taken in and out, and a lid portion that opens and closes the opening. Further, the area of the opening is smaller than the area of the filtration portion, and the pressing member is displaced so as to be able to be taken in and out of the opening.
  • FIG. 1A is a perspective view schematically showing a state in which the pressing member according to the present embodiment is deployed.
  • FIG. 3C is a perspective view schematically showing a folded state of the pressing member according to the present embodiment.
  • A) is a perspective view schematically showing a state in which the holding member according to the first modification of the present embodiment is deployed.
  • B) is a perspective view schematically showing a state in which the pressing member according to the first modification of the present embodiment is being folded.
  • C) is a perspective view schematically showing a folded state of the pressing member according to the first modification of the present embodiment. It is sectional drawing which shows schematicly about the filtration apparatus for water treatment which concerns on 1st modification of this embodiment.
  • FIG. 1 is a perspective view schematically showing a holding member according to a second modification of this embodiment.
  • (B) is a perspective view schematically showing a state in which a holding member according to a second modification of the present embodiment is curved. It is sectional drawing which shows typically the deformation example of the locked state between a holding member and a locking portion. It is a schematic diagram for demonstrating the water treatment system provided with the water treatment filtration apparatus which concerns on this Embodiment and the modified example.
  • the water treatment filtration device 10 includes a fiber filter medium 3 in which a plurality of fibers 2 are aggregated. Then, in the water treatment filtration device 10 of the present embodiment, the water treatment filter medium 1 including the fiber filter medium 3 is used.
  • the water treatment filter medium 1 of the present embodiment includes a fiber filter medium 3 in which a plurality of fibers 2 are aggregated.
  • the fiber filter medium 3 is a fiber structure made of a woven fabric or a non-woven fabric, and is formed in a flexible sheet shape as shown in FIG.
  • the fiber filter medium 3 has a large number of pores 4 through which water to be treated can pass.
  • the fiber filter medium 3 may be a fiber structure in which a plurality of woven fabrics and / or non-woven fabrics are laminated.
  • the fiber filter medium 3 is preferably a non-woven fabric from the viewpoint of efficiently capturing the insoluble components in the water to be treated while suppressing the pressure loss.
  • the material of the fiber 2 constituting the fiber filter medium 3 is not particularly limited, and for example, a material having high durability against water and chemicals can be used.
  • a material having high durability against water and chemicals can be used.
  • the material of the fiber 2 at least one of the olefin resin fiber and the polyester resin fiber can be used.
  • the material of the fiber 2 at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and polybutylene terephthalate can be used.
  • the material of the fiber 2 at least one selected from the group consisting of cellulose, acrylic resin and polyamide can be used.
  • the fiber filter medium 3 By using such an inexpensive fiber material as the fiber filter medium 3, a low-cost water treatment filter medium 1 can be realized. Further, the fiber filter medium 3 made of the above material has excellent flexibility. Therefore, unlike a general disposable cartridge filter, the water treatment filter medium 1 can be easily removed by hand washing or washing with a washing machine after use. As a result, the water treatment filter medium 1 can be reused many times. Further, the water treatment filter medium 1 is excellent in durability because it can be used continuously without any problem even if a part of the fiber filter medium 3 is damaged by repeated washing.
  • the average value of the fiber diameters of the fibers 2 constituting the fiber filter medium 3 is preferably 0.1 ⁇ m to 10 ⁇ m.
  • the basis weight of the fiber filter medium 3 is preferably 10 g / m 2 or more.
  • the thickness of the fiber filter medium 3 is not particularly limited, and may be various thicknesses.
  • a sheet-shaped fiber filter medium 3 having a thickness similar to that of chili paper or tissue can be used.
  • the thickness of the sheet-shaped fiber filter medium 3 is preferably such that dirt adhering to the inside of the fiber filter medium 3 can be easily removed.
  • the fiber filter medium 3 a fiber structure having pleats (folds) on the entire surface may be used. Having pleats makes it possible to enhance the effect of removing insoluble components in the water to be treated. That is, the larger the surface area of the fiber filter medium 3 with respect to the cross-sectional area through which the water to be treated passes in the filtration container portion described later, the larger the area for filtering the insoluble component, and the purification performance is improved. Therefore, by providing pleats on the fiber filter medium 3 to increase the area for filtering the insoluble components, it is possible to improve the collection performance of the insoluble components.
  • the method of forming the pleats on the fiber filter medium 3 is not particularly limited, but the pleats can be formed, for example, by repeatedly folding the fiber structure.
  • the water treatment filter medium 1 carries a cationic flocculant on the surface of the fibers 2 constituting the fiber filter medium 3.
  • the fine particles of the insoluble component in the water to be treated are usually negatively charged and float in the water to be treated while electrically repelling each other. Then, when the fine particles in the water to be treated come into contact with the cationic flocculant, the fine particles are electrically neutralized, so that the fine particles can bind to each other and aggregate. Further, since the fine particles of the insoluble component in the water to be treated are negatively charged, they are electrostatically adsorbed to the cationic flocculant.
  • the cationic flocculant is not particularly limited as long as it can electrically neutralize fine particles of insoluble components in the water to be treated.
  • the cationic flocculant is preferably a flocculant composed of at least one of an inorganic material and a natural organic polymer material.
  • the cationic flocculant composed of an inorganic material is at least one selected from the group consisting of polyaluminum chloride, band sulfate (aluminum sulfate), ferric sulfate, ferrous sulfate, polysilica iron, ferric chloride and slaked lime. Is preferable.
  • the flocculant made of a natural organic polymer material is preferably chitosan.
  • the water treatment filter medium 1 carries an anionic surfactant in addition to the cationic flocculant on the surface of the fibers 2 constituting the fiber filter medium 3.
  • an anionic surfactant is adhered to the surface of the fiber filter medium 3, the surface of the fiber 2 is negatively charged, and then the surface of the fiber 2 is brought into contact with the cationic flocculant to cause cationic aggregation.
  • the agent is supported on the surface of the fiber 2.
  • the fiber filter medium 3 when the fiber filter medium 3 is brought into direct contact with the cationic flocculant, when the surface of the fiber 2 is positively charged, the surface of the fiber 2 and the cationic flocculant repel each other, and the surface of the fiber 2 is repelled. It becomes difficult for the cationic flocculant to be supported on the fiber.
  • the anionic surfactant on the surface of the fiber filter medium 3 in advance, the surface of the fiber 2 is negatively charged.
  • the cationic flocculant is easily adsorbed on the surface of the fiber filter medium 3.
  • the cationic flocculant can be efficiently supported on the surface of the fiber filter medium 3. Further, in the fiber filter medium 3, the cationic flocculant is supported via an anionic surfactant, and the anionic surfactant exerts an anchor effect between the surface of the fiber 2 and the cationic flocculant. Therefore, the cationic flocculant can be stably retained on the surface of the fiber 2 for a long period of time.
  • the anionic surfactant is not particularly limited as long as it can exhibit the above effects, but for example, at least one selected from the group consisting of a carboxylic acid type, a sulfonic acid type, a sulfate ester type, and a phosphoric acid ester type should be used. Can be done.
  • the carboxylic acid type anionic surfactant shall be at least one selected from the group consisting of aliphatic monocarboxylic acid salts, polyoxyethylene alkyl ether carboxylates, N-acyl sarcosin salts, and N-acyl glutamates. Is preferable.
  • Sulfonic acid type anionic surfactants are dialkyl sulfosulfates, alkane sulfonates, alpha olefin sulfonates, linear alkyl benzene sulfonates, alkyl (branched chain) benzene sulfonates, naphthalene sulfonates-formaldehyde. It is preferably at least one selected from the group consisting of condensates, alkylnaphthalene sulfonates, and N-methyl-N-acyltaurine salts.
  • the sulfate ester type anionic surfactant is preferably at least one selected from the group consisting of alkyl sulfates, polyoxyethylene alkyl ether sulfates, and fat and oil sulfates.
  • the phosphoric acid ester type anionic surfactant is preferably at least one selected from the group consisting of alkyl phosphates, polyoxyethylene alkyl ether phosphates, and polyoxyethylene alkyl phenyl ether phosphates.
  • the water treatment filter medium 1 is held and used inside the filtration container portion. At this time, the water treatment filter medium 1 may be held inside the filtration container portion in a state of being irregularly folded and laminated. Further, the water treatment filter medium 1 may be held inside the filtration container portion in a state of wrinkling or losing its shape due to being squeezed or rolled, that is, in a so-called crumpled state.
  • the water treatment filter medium 1 wrapped in the net 5 is held inside the filtration container portion. You may.
  • a plurality of sheet-shaped filter media 1 for water treatment are randomly put into the hollow net 5 having a substantially cylindrical shape.
  • the plurality of sheets of the water treatment filter medium 1 are the water of at least one of the water treatment filter medium 1 in the folded and laminated state and the water treatment filter medium 1 in the so-called crumpled state. It is preferable to fill the net 5 so that the processing filter medium 1 is present.
  • the columnar net 5 can have a size corresponding to the filtration portion of the filtration container portion described later.
  • the columnar net 5 can be formed so that the size is slightly larger than that of the filtration portion of the filtration container portion. Then, when the net 5 filled with the water treatment filter medium 1 is arranged and held in the filtration portion, the water treatment filter medium 1 inside the net 5 is compressed by a predetermined amount in the radial direction and the axial direction of the net 5. It is possible to do so. By doing so, the water treatment filter medium 1 can be easily taken in and out of the filter container portion.
  • the shape of the net 5 is not limited to a columnar shape, and various shapes can be used.
  • the water to be treated and the cationic flocculant come into contact with each other.
  • the insoluble component fine particles in the water to be treated are usually negatively charged, but the fine particles are electrically neutralized by contact with a cationic flocculant.
  • the electrically neutralized fine particles tend to come close to each other, and the particles are bonded to each other by the van der Waals force.
  • the insoluble component fine particles aggregate with each other.
  • the negatively charged insoluble component fine particles are electrostatically adsorbed on the cationic flocculant supported on the surface of the fiber 2. Therefore, the fine particles of the insoluble component are captured on the surface of the fiber 2 in the water treatment filter medium 1 and separated from the water to be treated. In this way, the insoluble component can be removed by passing the water to be treated through the water treatment filter medium 1.
  • the water treatment filter medium 1 of the present embodiment includes a cationic flocculant composed of at least one of an inorganic material and a natural organic polymer material, and an anionic surfactant.
  • the water treatment filter medium 1 further includes a fiber filter medium 3 in which a plurality of fibers 2 are aggregated and both a cationic flocculant and an anionic surfactant are supported on the surface of each fiber 2. Since the water treatment filter medium 1 carries a cationic flocculant on the surface of each fiber 2 of the fiber filter medium 3, it electrostatically adsorbs fine particles of insoluble components in the water to be treated, and further aggregates the fine particles with each other. Let me.
  • the fine particles of the insoluble component can be retained on the surface of each fiber 2 of the fiber filter medium 3. Therefore, the insoluble component can be separated and removed from the water to be treated by passing the water to be treated through the water treatment filter medium 1. Further, on the surface of the fiber filter medium 3, the cationic flocculant is supported via an anionic surfactant. Therefore, the cationic flocculant can be stably retained on the surface of the fiber filter medium 3 for a long period of time.
  • the water treatment filter medium 1 uses the fiber filter medium 3 as the base material, it is possible to suppress the generation of mud balls and maintain the filtration performance in a high state for a long period of time.
  • the cationic flocculant made of an inorganic material is preferably polyaluminum chloride, and the cationic flocculant made of a natural organic polymer material is preferably chitosan.
  • these materials tend to electrostatically adsorb fine particles of insoluble components in the water to be treated, and further tend to agglomerate the fine particles with each other. Therefore, by using these materials as the cationic flocculant, it is possible to further improve the filtration performance of the water treatment filter medium 1.
  • the fiber filter medium 3 is preferably made of a material that can be washed with water. That is, the fiber filter medium 3 is preferably made of a material that is not damaged even when washed with water.
  • the water treatment filter medium 1 can be taken out from the filtration container and washed with water. Then, by adding chemicals (cationic flocculant and anionic surfactant) at the time of washing, the consumed chemicals can be supplied each time. Therefore, the water treatment filter medium 1 can maintain high filtration performance for a long period of time. Further, since such a water treatment filter medium 1 can be regularly washed with a strong force, for example, by hand washing or washing using a washing machine, the generation of mud balls is suppressed and high filtration performance is achieved. Can be sustained.
  • the fiber filter medium 3 itself, which is a collection of a plurality of fibers 2, is used as the water treatment filter medium 1, and the water treatment filter medium 1, that is, the fiber filter medium 3 is put into the inside of the filtration container and held.
  • the water to be treated may be filtered.
  • water treatment filter medium 1 and / or the fiber filter medium 3 does not need to be formed in a sheet shape, and can be formed into various shapes.
  • the columnar water treatment filter medium 1 and the like can have a size corresponding to the filtration portion of the filtration container portion described later.
  • a columnar water treatment filter medium 1 or the like is formed so as to have a size slightly larger than the filtration portion of the filtration container portion, and the water treatment filter medium 1 or the like is arranged and held in the filtration portion.
  • the fiber filtration portion by using a plurality of columnar water treatment filter media 1 and the like whose size is smaller than that of the filtration portion of the filtration container portion. Further, the columnar water treatment filter medium 1 and the like may be wrapped in the net 5.
  • FIG. 4 shows a thick, lumpy (lumpy) water treatment filter medium 1 and the like. Then, in FIG. 4, the thick block of water treatment filter medium 1 and the like are arranged inside the substantially columnar net 5 in a state of being rolled into a spiral shape.
  • the water treatment filter medium 1 and the like may include at least one of a sheet-shaped water treatment filter medium 1 and the like and a lumpy water treatment filter medium 1 and the like. That is, when a plurality of water treatment filter media 1 and the like are held inside the filtration container portion, the water treatment filter media 1 and the like having different shapes may be mixed.
  • the water treatment filtration device 10 is formed so as to be elongated in the vertical direction (vertical direction) while being placed on a floor, a pedestal, or the like. Then, the water to be treated is filtered by passing the water to be treated from above to below in the water treatment filtration device 10. Therefore, in the present embodiment, the direction from the upper side to the lower side in the vertical direction is the water flow direction of the water treatment filtration device 10.
  • the water flow direction of the water treatment filtration device 10 may intersect with the vertical direction. Further, the water treatment filtration device 10 may be curved or the like so that a curved water passage path is formed in the water treatment filtration device 10. In this case, the direction along the curved water flow path is the water flow direction of the water treatment filtration device 10.
  • the water treatment filter device 10 has a filter container portion 11 through which water to be treated can pass and a filter medium for water treatment that can be taken in and out of the filter container portion 11. It has 1st grade and. Further, a filtration unit 15 for filtering the water to be treated is provided inside the filtration container unit 11, and a water treatment filter medium 1 or the like is arranged in the filtration unit 15.
  • the water treatment filter medium 1 and the like arranged in the filtration unit 15 are pressed by the pressing member 14. That is, the water treatment filter medium 1 and the like are arranged in the filtration unit 15 in a state of being compressed by the pressing member 14.
  • the filtration container portion 11 includes a container main body portion 12 and a lid portion 13, so that a space is formed inside the filtration container portion 11 by the container main body portion 12 and the lid portion 13. I have to.
  • the container main body portion 12 has a substantially disk-shaped bottom wall portion 121 and a substantially cylindrical peripheral wall portion 122 connected to the outer peripheral edge of the bottom wall portion 121.
  • the peripheral wall portion 122 is formed so as to rise upward from the outer peripheral edge of the bottom wall portion 121, and has a large diameter portion 123 having substantially the same diameter from the lower end to the upper end and a large diameter portion 123 having substantially the same diameter from the lower end to the upper end. It is provided with a small diameter portion 124 having a diameter smaller than 123. Then, the upper end of the small diameter portion 124 is opened upward.
  • the peripheral wall portion 122 includes a continuous portion 125 in which a large diameter portion 123 and a small diameter portion 124 are continuously provided.
  • the continuous portion 125 has a curved shape so as to be convex upward and outward, and is smoothly connected to the large diameter portion 123 and the small diameter portion 124. By doing so, the inner surface of the peripheral wall portion 122 is formed with a smooth curved surface.
  • the container main body 12 has a substantially cylindrical wall portion (large diameter portion 123) extending in the vertical direction (water flow direction of the water to be treated), and the container main body An opening 124a opened toward the upstream side is formed in the portion 12.
  • the filtration portion 15 is formed in the large diameter portion 123. Therefore, in the present embodiment, the area of the opening 124a is smaller than the area of the filtration portion 15. Further, in the present embodiment, the water treatment filter medium 1 and the like can be taken in and out and the pressing member 14 can be taken in and out from the opening 124a.
  • the diameter of the opening 124a is preferably set so as to be larger than a size that allows a human hand to be inserted. By doing so, the holding member 14 can be smoothly taken in and out and fixed by a human hand.
  • the container main body 12 is formed with a locking portion 126 for locking the pressing member 14 introduced inside the container main body 12. Then, by locking the locked portion 14b of the pressing member 14 to the locking portion 126 so as to be releasable, the pressing member 14 that presses the water treatment filter medium 1 or the like arranged in the filtering portion 15 in a compressed state. Is fixed to the container body 12.
  • two substantially disk-shaped pressing members 14 are detachably provided on the container body 12. Specifically, of the two pressing members 14, the pressing member 14 fixed to the upper side (upstream side) of the container body portion 12 is the upstream side fixing plate 14A, and the lower side (downstream side) of the container body portion 12 is used.
  • the pressing member 14 fixed to is a downstream side fixing plate 14B.
  • the upstream side protrusion as an upstream side locking portion for locking the upstream side fixing plate (holding member arranged on the upstream side of the fiber filter medium 3) 14A.
  • a portion 126a is provided.
  • a downstream side fixing plate (holding member arranged on the downstream side of the fiber filter medium 3) 14B is locked on the downstream side of the upstream side protrusion 126a on the inner surface of the large diameter portion 123 of the container main body portion 12.
  • a downstream side protrusion 126b is provided as a downstream side locking part.
  • the upstream side protrusion 126a is formed so as to project from the inner surface of the large diameter portion 123 toward the inside (central axis side), and extends so as to be elongated in a substantially horizontal direction.
  • the four upstream protrusions 126a are formed substantially evenly along the circumferential direction.
  • downstream side protrusion 126b is also formed so as to project from the inner surface of the large diameter portion 123 toward the inside (central axis side), and extends so as to be elongated in the substantially horizontal direction.
  • the four downstream protrusions 126b are formed substantially evenly along the circumferential direction.
  • downstream side fixing plate 14B moves downward (downstream side). Is detachably provided on the container body 12 in a regulated state.
  • the upstream side fixing plate 14A moves upward (upstream side) by abutting (releasably locking) the locked portion 14b of the upstream side fixing plate 14A on the lower surface of the upstream side protrusion 126a. Is detachably provided on the container body 12 in a regulated state.
  • the contact of the locked portion 14b of the upstream fixing plate 14A with the lower surface of the upstream protruding portion 126a is performed by the restoring force of the water treatment filter medium 1 or the like compressed by the pressing by the upstream fixing plate 14A. .. That is, in the present embodiment, the water treatment filter medium 1 and the like are interposed between the upstream fixing plate 14A and the downstream fixing plate 14B in a compressed state.
  • the two pressing members 14 are arranged so as to be separated from each other in the water flow direction of the water treatment filtration device 10, and water is separated between the two pressing members 14 which are separated from each other.
  • a processing filter medium 1 or the like is interposed. That is, water treatment is performed between the upstream fixing plate 14A fixed to the upper side (upstream side) of the container main body 12 and the downstream fixing plate 14B fixed to the lower side (downstream side) of the container main body 12.
  • the filtration unit 15 on which the filter medium including the filter medium 1 and the like is arranged is formed.
  • the portion of the filtration unit 15 where the water treatment filter medium 1 and the like are arranged is the fiber filtration unit 151.
  • the fiber filtration unit 151 is filled with one or more water treatment filter media 1 and the like. In this embodiment, the entire filtration unit 15 is illustrated as the fiber filtration unit 151.
  • a part of the filtration unit 15 becomes the fiber filtration unit 151.
  • an activated carbon layer in which activated carbon is arranged is formed on the downstream side of the filtration unit 15, and a fiber filtration unit 151 in which a water treatment filter medium 1 or the like is arranged is formed on the upstream side of the activated carbon layer.
  • a fiber filtration unit 151 in which a water treatment filter medium 1 or the like is arranged is formed on the upstream side of the activated carbon layer.
  • the lid portion 13 is detachably attached to the container main body portion 12 so as to close the opening 124a at the upper end of the container main body portion 12.
  • the lid portion 13 has a substantially disk-shaped upper wall portion 131 and a peripheral wall portion 132 that hangs down from the outer peripheral end of the upper wall portion 131 and is one size larger than the small diameter portion 124 of the container main body portion 12.
  • the filtration container portion 11 may have any shape as long as it can form a space inside.
  • the upper wall portion 131 of the lid portion 13 is provided with an introduction hole 131a for introducing the water to be treated into the inside of the filtration container portion 11. Further, the bottom wall portion 121 of the container main body portion 12 is provided with a lead-out hole 121a for leading out the water to be treated (treated water: filtered water) that has passed through the filtration portion 15 to the outside of the filtration container portion 11. ..
  • the introduction hole 131a for introducing the water to be treated is formed on the upstream side of the upstream side protrusion (upstream side locking portion) 126a in the filtration container portion 11.
  • a plate member having holes 14a provided substantially uniformly on the entire surface can be used.
  • a plate member for example, a punching plate can be used.
  • a non-woven fabric having high strength can also be used.
  • the pressing member 14 arranged so as to cover the upper surface and the lower surface of the filtration unit 15 can be taken in and out through the opening 124a having a smaller area than the filtration unit 15.
  • the pressing member 14 can be reversibly displaced from a state in which the upper surface and the lower surface of the filtration unit 15 can be covered to a state in which the pressing member 14 can be taken in and out from the opening 124a. Then, the pressing member 14 is displaced to a state where it can be taken in and out of the opening 124a so that it can be taken in and out of the opening 124a.
  • the pressing member 14 includes a divided body 141 divided into a plurality of parts.
  • the pressing member 14 can be unfolded or folded by relatively moving the plurality of divided bodies 141.
  • the pressing member 14 includes two semicircular divided bodies 141. Then, the two divided bodies 141 are connected by a hinge 142 at a straight line portion. At this time, the two divided bodies 141 are connected by a hinge 142 so that one divided body 141 can be relatively moved between 0 ° and 180 ° with respect to the other divided body 14. By doing so, it is possible to reversibly displace between the unfolded state which is substantially a disk shape in a plan view and the folded state which is a substantially semicircular shape in a plan view.
  • the upstream side fixing plate 14A and the downstream side fixing plate 14B have substantially the same shape. That is, using the pressing member 14 having a common structure, the pressing member 14 arranged on the downstream side is the downstream fixing plate 14B, and the pressing member 14 arranged on the upstream side is the upstream fixing plate 14A.
  • the shape of the pressing member 14 By making the shape of the pressing member 14 such a shape, the upper surface of the water treatment filter medium 1 or the like arranged in the filtering portion 15 by the pressing member 14 inserted from the opening 124a having an area smaller than that of the filtering portion 15. And almost the entire surface of the lower surface is pressed.
  • the pressing member 14 and the water treatment filter medium 1 and the like are introduced into the container main body 12 as follows.
  • the following method is only an example, and other methods can be used.
  • one (one) pressing member 14 is introduced into the container main body 12 in a state of being folded into a semicircle. Then, the pressing member 14 introduced into the container main body portion 12 is developed so as to have a substantially disk shape on the downstream side of the upstream side protrusion 126a and on the upstream side of the downstream side protrusion 126b. Then, in a state of being deployed so as to have a substantially disk shape, the locked portion 14b on the outer peripheral side is placed on the upper surface of the downstream protruding portion 126b (locked so that it can be released), so that the downstream fixing plate 14B However, the container body 12 is detachably provided.
  • the water treatment filter medium 1 and the like are introduced into the container main body portion 12 and placed on the pressing member 14 (downstream side fixing plate 14B) placed on the upper surface of the downstream side protrusion 126b.
  • the water treatment filter medium 1 or the like arranged on the pressing member 14 the ones shown in FIGS. 1 to 4 can be used.
  • the water treatment filter medium 1 and the like can be arranged on the pressing member 14 (downstream side fixing plate 14B) in a folded and laminated state or in a so-called crumpled state.
  • the other pressing member 14 is folded into a semicircle and introduced into the container body 12. After that, the pressing member 14 introduced into the container main body 12 is opened in a half-open state so that the downstream side is separated, and the pressing member 14 is moved downward in this state.
  • the holding member 14 in the half-opened state is developed so as to have a substantially disk shape while pressing the water treatment filter medium 1 or the like arranged on the downstream fixing plate 14B.
  • the locked portion 14b on the outer peripheral side faces the lower surface of the upstream protruding portion 126a in a state of being unfolded so as to have a substantially disk shape.
  • the pressing member 14 moves upward (upstream side) due to the restoring force of the compressed water treatment filter medium 1 or the like, and the locked portion 14b collides with the upstream side. It abuts (locks releasably) on the lower surface of the portion 126a.
  • the upstream fixing plate 14A is detachably provided on the container main body 12.
  • the water treatment filter medium 1 and the like arranged in the filtration unit 15 are compressed in a folded and laminated state or in a crumpled state.
  • the crushed pores 4 of the water treatment filter medium 1 and the like are formed in the entire filtration section 15 (fiber filtration section 151) so that the water treatment filter medium 1 and the like can be used three-dimensionally. become.
  • the filtration unit 15 may be formed by a water treatment filter medium 1 or the like wrapped in a net 5.
  • the water treatment filter medium 1 and the like become denser as they are compressed, and minute insoluble components in the water to be treated, for example, micron-order insoluble components can be removed.
  • the following may be performed. That is, a larger amount of the filter medium 1 for water treatment is arranged between the upstream side fixing plate 14A and the downstream side fixing plate 14B, and is compressed by the upstream side fixing plate 14A and the downstream side fixing plate 14B.
  • the filtration unit 15 fiber filtration unit 151 having the filtration performance of the above may be used.
  • the water treatment filter medium 1 and the like are used three-dimensionally, so that it is possible to perform filtration with higher performance than the sand filter medium.
  • the filtration unit 15 having the desired filtration performance (fiber filtration unit 151). ) Can be.
  • the upstream side protrusions 126a for locking the upstream side fixing plate 14A may be provided at a plurality of locations in a state of being separated along the vertical direction (water flow direction of the water treatment filtration device 10). By doing so, even when the same amount of the water treatment filter medium 1 or the like is used, the water treatment filter medium 1 or the like is compressed according to the position of the upstream side protrusion 126a that locks the upstream side fixing plate 14A. The amount can be changed step by step.
  • the pressing member 14 shown in FIG. 7 is formed by using three or more (8 members in FIG. 7) divided bodies 141 having a substantially fan shape in a plan view. Specifically, the tips of the eight fan-shaped split bodies 141 are connected to the shaft portion 143, and each split body 141 is slid in the circumferential direction with respect to the other split bodies to be unfolded or folded. I am trying to be able to hang out.
  • the pressing member 14 shown in FIG. 7 includes a divided body 141 divided into a plurality of parts.
  • the pressing member 14 shown in FIG. 7 can be unfolded or folded by relatively moving the plurality of divided bodies 141.
  • the water treatment filtration device 10 shown in FIG. 8 basically has substantially the same configuration as the water treatment filtration device 10 shown in FIG.
  • the introduction hole 124b for introducing the water to be treated into the inside of the filtration container portion 11 is not the upper wall portion 131 of the lid portion 13, but the peripheral wall portion 122. It is provided on the upper part (small diameter portion 124).
  • the introduction hole 124b is also formed on the upstream side of the upstream side protrusion (upstream side locking portion) 126a in the filtration container portion 11.
  • an upstream side fixing plate (holding member arranged on the upstream side of the fiber filter medium 3) 14A is engaged with the inner surface of the large diameter portion 123 of the container main body portion 12.
  • An upstream side protrusion 126a is provided as an upstream side locking part to stop.
  • a downstream side fixing plate (holding member arranged on the downstream side of the fiber filter medium 3) 14B is locked on the downstream side of the upstream side protrusion 126a on the inner surface of the large diameter portion 123 of the container main body portion 12.
  • a downstream side protrusion 126b is provided as a downstream side locking part.
  • the upstream side protrusion 126a is formed so as to project from the inner surface of the large diameter portion 123 toward the inside (central axis side), and is formed in a substantially horizontal direction. It is formed over the entire circumference so as to extend to.
  • the downstream side protrusion 126b is also formed so as to project from the inner surface of the large diameter portion 123 toward the inside (central axis side), and is formed over the entire circumference so as to extend substantially in the horizontal direction. Has been done.
  • the pressing member 14 (upstream side fixing plate 14A and downstream side fixing plate 14B) shown in FIG. 9 is made of an elastic material such as rubber, and can be flexed while elastically deforming the whole. There is.
  • the pressing member 14 and the water treatment filter medium 1 and the like are introduced into the container main body 12 as follows.
  • the following method is only an example, and other methods can be used.
  • one (one) pressing member 14 is curved as shown in FIG. 9 (b) and introduced into the container main body 12.
  • the pressing member 14 is deployed inside the container body 12, and the locked portion 14b on the outer peripheral side is placed (locked releasably) on the upper surface of the downstream protruding portion 126b, whereby the downstream fixing plate is fixed.
  • 14B is detachably provided on the container main body 12.
  • the pressing member 14 is strongly pushed downward to bend the pressing member 14. By doing so, the outer peripheral edge of the pressing member 14 gets over the upstream protruding portion 126a, and the pressing member 14 moves to the downstream side of the upstream protruding portion 126a. Then, if the locked portion 14b is further moved to the downstream side in the same state, the locked portion 14b is placed on the upper surface of the downstream side protrusion 126b.
  • the pressing member 14 to be introduced first can be as follows after being introduced into the container main body 12. First, the pressing member 14 introduced into the container body 12 is developed so as to have a substantially disk shape on the downstream side of the upstream side protrusion 126a and on the upstream side of the downstream side protrusion 126b. Then, in a state of being deployed so as to have a substantially disk shape, the locked portion 14b on the outer peripheral side is placed on the upper surface of the downstream protruding portion 126b (locked so that it can be released), so that the downstream fixing plate 14B However, the container body 12 is detachably provided.
  • the water treatment filter medium 1 and the like are introduced into the container main body portion 12 and placed on the pressing member 14 (downstream side fixing plate 14B) placed on the upper surface of the downstream side protrusion 126b.
  • the water treatment filter medium 1 or the like arranged on the pressing member 14 the ones shown in FIGS. 1 to 4 can be used.
  • the other pressing member 14 is curved as shown in FIG. 9B inside the container main body 12. Introduce and push strongly downward. By doing so, the other pressing member 14 is moved to the downstream side of the upstream side protrusion 126a so that the upstream side fixing plate 14A is detachably provided on the container main body portion 12.
  • the water to be treated introduced into the inside of the filtration container portion 11 through the introduction hole 131a of the lid portion 13 and the introduction hole 124b of the small diameter portion 124 passes through the hole portion 14a of the upstream fixing plate 14A and is used as a water treatment filter medium 1.
  • the water treatment filter medium 1 carries a cationic flocculant on the surface of each fiber 2 of the fiber filter medium 3, the fine particles of the insoluble component in the water to be treated are electrostatically adsorbed and the fine particles are aggregated with each other. Let me.
  • the water to be treated that has passed through the water treatment filter medium 1 passes through the hole 14a of the downstream fixing plate 14B and is led out to the outside of the filtration container 11 through the lead-out hole 121a of the container body 12.
  • the water treatment filtration device 10 of the present embodiment includes the water treatment filter medium 1 and the filtration container portion 11 that holds the water treatment filter medium 1 inside. Then, inside the filter container portion 11, the water treatment filter medium 1 is three-dimensionally (three-dimensionally) arranged by using the pressing member 14. Therefore, it is possible to suppress clogging of the water treatment filter medium 1 and maintain the filtration performance in a high state for a long period of time while performing filtration having higher performance than the sand filter medium.
  • the water treatment filter medium 1 is held between the upstream side fixing plate 14A and the downstream side fixing plate 14B in a compressed state, so that the water treatment filter medium 1 is between the fibers 2 of the water treatment filter medium 1.
  • the distance can be reduced. As a result, it is possible to improve the collection performance of the water treatment filter medium 1.
  • the filtration container portion 11 includes a container main body portion 12 and a lid portion 13. Therefore, the water treatment filter medium 1 can be easily taken out by removing the upstream side fixing plate 14A after removing the lid portion 13 from the container main body portion 12. Then, since the water treatment filter medium 1 can be washed or replaced as needed, the maintenance and management of the water treatment filtration device 10 can be easily performed.
  • the water treatment system 100 includes a main flow path 20.
  • One end of the main flow path 20 reaches the treated water W, which is well water or tap water existing in the ground.
  • the other end of the main flow path 20 is connected to the faucet 50.
  • a pump P is connected upstream of the drug dissolving device 30 in the main flow path 20.
  • the pump P pumps the water to be treated W along the main flow path 20.
  • a pump P for example, an electric pump provided with an accumulator and a pressure switch can be used.
  • the water W to be treated pumped up by the pump P is introduced into the drug dissolving device 30, and the drug dissolving device 30, for example, dissolves a certain amount of chlorine-based chemicals.
  • a water treatment filtration device 10 and a chlorine removal tank 40 are connected downstream of the drug dissolving device 30 in the main flow path 20.
  • the chlorine removing tank 40 removes excess chlorine contained in the water to be treated W.
  • As the chlorine removal tank 40 a container filled with activated carbon particles is used.
  • the chlorine removing tank 40 filled with activated carbon particles may be provided on the downstream side of the portion where the fiber filtration portion 151 is formed inside the water treatment filtration device 10.
  • an aggregation promoting portion for promoting aggregation of fine particles of insoluble components contained in the water to be treated W is provided between the drug dissolving device 30 and the water treatment filtering device 10. It may be intervened.
  • the aggregation promoting portion can be directly connected to the main flow path 20, and for example, the one described in Japanese Patent No. 6519934 can be used.
  • a predetermined flow rate for example, about 6.3 L / min
  • the pump P first operates to pump up the well water or tap water to be treated W existing in the ground.
  • the pumped water W to be treated passes through the chemical dissolution device 30, and a chlorine-based chemical such as an aqueous solution of sodium hypochlorite is introduced.
  • a chlorine-based chemical such as an aqueous solution of sodium hypochlorite
  • a chlorine-based chemical for example, insoluble iron hydroxide (Fe (OH) 3 3) is formed before the iron ions in the water W to be treated become colloidal iron silicate. Become.
  • the insoluble component of the water W to be treated in which the chlorine-based chemical is dissolved by passing through the chemical dissolving device 30, is removed by passing through the water treatment filtration device 10.
  • the main flow path 20 is connected to the introduction hole 13c of the lid portion 13 and the outlet hole 12c of the container body portion 12 in the water treatment filtration device 10. Then, as described above, when the water to be treated W passes through the water treatment filter medium 1, the insoluble components in the water to be treated W are captured and removed.
  • Excess chlorine is removed from the water W to be treated that has passed through the water treatment filtration device 10 by passing through the chlorine removal tank 40. Then, the water from which the foreign matter and the excess chlorine have been removed through the water treatment filtration device 10 and the chlorine removal tank 40 is supplied to the user from the faucet 50.
  • the pumped water W to be treated passes through the chemical dissolution device 30, the water treatment filtration device 10, and the chlorine removal tank 40, so that insoluble components and excess chlorine are removed. Then, the water treatment filtration device 10 can separate the fine particles of the insoluble component in the water to be treated W with high efficiency, so that clean water can be stably provided to the user.
  • the water treatment filtration device 10 includes a filtration container portion 11 through which the water to be treated can pass, and a filtration unit 15 provided inside the filtration container portion 11 for filtering the water to be treated. There is.
  • the water treatment filtration device 10 is arranged in the filtration unit 15, and the fiber filter medium 3 that can be taken in and out of the filtration container unit 11 and the fiber filter medium 3 arranged in the filtration unit 15 are compressed.
  • a pressing member 14 for pressing is provided.
  • the filtration container portion 11 has a container main body portion 12 in which an opening 124a through which the pressing member 14 can be taken in and out is formed, and a lid portion 13 for opening and closing the opening 124a.
  • the area of the opening 124a is smaller than the area of the filtration portion 15, and the pressing member 14 is displaced so that it can be taken in and out of the opening 124a.
  • the water treatment filtration device 10 is configured so that the pressing member 14 and the fiber filter medium 3 can be taken in and out from the opening 124a of the container main body 12. Therefore, the fiber filter medium 3 can be easily taken out, and the fiber filter medium 3 can be washed more easily.
  • the fiber filter medium 3 can be taken out from the container main body 12 and washed, it is not necessary to provide a mechanism such as backwashing in the water treatment filtration device 10, and the configuration can be simplified.
  • the fiber filter medium 3 as a filtration filter, the fiber filter medium 3 can be used three-dimensionally (three-dimensionally). As a result, it is possible to suppress clogging of the fiber filter medium 3 and maintain the filtration performance in a high state for a long period of time while performing filtration having higher performance than that of the sand filter medium.
  • the fiber filter medium 3 is used as a filtration filter, it is possible to easily remove the adhering stains by hand washing or washing with a washing machine after use. As a result, the fiber filter medium 3 can be reused many times.
  • the fiber filter medium 3 is used in a compressed state. Therefore, the fiber filter medium 3 can continue to be used without any problem even if a part of the fiber filter medium 3 is damaged by repeated cleaning, and is excellent in durability.
  • the compressed fiber filter medium 3 as a filtration filter, it is possible to obtain a filter having a high processing capacity by using the relatively inexpensive fiber filter medium 3.
  • the fiber filter medium 3 in the compressed state (the state in which the pores 4 are small) is used for filtration and the fiber filter medium 3 in the uncompressed state (the state in which the pores 4 are large) is used for cleaning. At the time of the state, the captured insoluble component can be more easily removed from the fiber filter medium 3.
  • the pressure applied to the lid portion 13 that opens and closes the opening 124a can be reduced, and the filtration container portion 11 is damaged. Can be suppressed.
  • the fiber filter medium 3 can be easily taken out even in the water treatment filtration device 10 in which the pressure applied to the lid portion 13 is reduced. You will be able to do it.
  • the water treatment filtration device 10 capable of suppressing an increase in running cost while simplifying the configuration.
  • the pressing member 14 may include a plurality of divided bodies 141, and may be configured to be unfoldable and foldable by relatively moving the plurality of divided bodies 141.
  • the pressing member 14 can be taken in and out from the opening 124a having a small area with a simpler configuration.
  • the pressing member 14 includes two divided bodies 141, and by connecting one divided body 141 to the other divided body 141 so as to be relatively movable between 0 ° and 180 °, it can be unfolded and folded. It may be configured to be possible.
  • the pressing member 14 can be folded in half or expanded into a disk shape by simply moving one of the divided bodies 141 relative to each other. Therefore, the pressing member 14 can be unfolded and folded more easily.
  • the pressing member 14 may be detachably provided on the container main body portion 12.
  • the fiber filter medium 3 can be more easily and surely taken out from the container body 12.
  • the fiber filter medium 3 arranged in the filtration unit 15 may be compressed in a crumpled state.
  • the crushed pores 4 of the fiber filter medium 3 are formed in the entire filtration section 15, and the fiber filter medium 3 can be used more reliably and three-dimensionally.
  • the fiber filter medium 3 may include at least one of the sheet-shaped fiber filter medium 3 and the massive fiber filter medium 3.
  • the filtration unit 15 may have a fiber filtration unit 151 formed by the fiber filter medium 3. Then, the fiber filtration unit 151 may be filled with one or more fiber filter media 3.
  • the filtration unit 15 may be formed by the fiber filter medium 3 wrapped in the net 5.
  • the fiber filter medium 3 can be taken in and out of the container body 12 more easily. Further, if the net 5 is filled with the torn fiber filter medium 3, the filter medium having substantially the same function as one fiber filter medium 3 can be obtained.
  • the fiber filter medium 3 may be formed of at least one of an olefin-based fiber and a polyester-based fiber.
  • the fiber filter medium 3 can be formed using a relatively inexpensive material.
  • the average value of the fiber diameter of the fiber filter medium 3 may be 0.1 to 10 ⁇ m, and the basis weight may be 10 g / m 2 or more.
  • the fiber diameter of the fiber 2 constituting the fiber filter medium 3 and the basis weight of the fiber filter medium 3 within the above ranges, the specific surface area inside the fiber filter medium is increased, and the contact property between the water to be treated and the flocculant is increased. Therefore, it becomes possible to efficiently capture the insoluble components in the water to be treated.
  • the clue portion 144 may be formed on the pressing member 14.
  • the pressing member 14 can be more easily attached to and detached from the container body 12.
  • the container main body portion 12 may be provided with an upstream side locking portion 126a for locking the pressing member 14A arranged on the upstream side of the fiber filter medium 3.
  • introduction holes 131a and 124b for introducing water to be treated may be formed on the upstream side of the filtration container portion 11 with respect to the upstream locking portion 126a.
  • the upstream side of the filtration unit 15 can be used, for example, as an aggregation promoting unit that promotes aggregation of fine particles of insoluble components contained in the water to be treated W.
  • the container main body portion 12 may have a substantially cylindrical wall portion 122 extending in the water flow direction of the water to be treated.
  • the inner surface of the container main body 12 can be made a smooth curved surface, and it is possible to prevent the stress applied to the inside of the container main body 12 from being concentrated on a part of the container main body 12. Can be prevented from being damaged.
  • the pressing member 14 may have a substantially disk-shaped upstream fixing plate 14A and a substantially disk-shaped downstream fixing plate 14B.
  • the container body 12 has an upstream locking portion 126a that regulates the upstream movement of the upstream fixing plate 14A and a downstream locking portion that regulates the downstream locking of the downstream fixing plate 14B. 126b and may be provided.
  • the fiber filter medium 3 may be compressed between the upstream side fixing plate 14A and the downstream side fixing plate 14B.
  • both the upstream side fixing plate 14A and the downstream side fixing plate 14B that partition the upstream side and the downstream side of the filtration unit 15 can be taken out, so that the cleaning and maintenance of the water treatment filtration device 10 can be performed more easily. You will be able to do it.
  • upstream locking portion 126a is an upstream projecting portion 126a projecting inward of the container body 12, and the downstream locking portion 126b projects downstream toward the inside of the container body 12. It may be a protrusion 126b.
  • the upstream side fixing plate 14A and the downstream side fixing plate 14B can be locked more reliably.
  • the water treatment filtration device according to the present embodiment has been described above, but the present embodiment is not limited to these, and various modifications can be made within the scope of the gist of the present embodiment.
  • a filtration device for water treatment capable of suppressing an increase in running cost while simplifying the configuration.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

Le dispositif de filtration pour traitement de l'eau (10) de l'invention est équipé : d'une partie réceptacle de filtration (11) permettant le passage de l'eau à traiter ; et d'une partie filtration (15) qui est agencée dans une partie interne de la partie réceptacle de filtration (11), et qui filtre l'eau à traiter En outre, ce dispositif de filtration pour traitement de l'eau (10) est équipé : d'un matériau filtrant en fibre (3) disposé dans la partie filtration (15), et pouvant être extrait de la partie interne de la partie réceptacle de filtration (11) ou introduit dans celle-ci ; et d'un élément de retenu (14) qui retient le matériau filtrant en fibre (3) disposé dans la partie filtration (15) dans un état de compression. La partie réceptacle de filtration (11) possède : une partie corps principal de réceptacle (12) dans laquelle est formée une partie ouverture (124a) permettant l'extraction ou l'introduction de l'élément de retenu (14) ; et une partie couvercle (13) ouvrant et fermant la partie ouverture (124a). Enfin, la surface de la partie ouverture (124a) est inférieure à celle de la partie filtration (15), et l'élément de retenu (14) se déplace de manière à permettre l'extraction depuis la la partie ouverture (124a) ou l'introduction dans celle-ci.
PCT/JP2020/021564 2019-06-26 2020-06-01 Dispositif de filtration pour traitement de l'eau WO2020261883A1 (fr)

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JP2019-118779 2019-06-26
JP2019118779 2019-06-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7498888B2 (ja) 2021-08-25 2024-06-13 株式会社石垣 ろ過処理方法
JP7498887B2 (ja) 2021-08-25 2024-06-13 株式会社石垣 ろ過処理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01151815U (fr) * 1988-03-25 1989-10-19
JPH1052615A (ja) * 1996-08-12 1998-02-24 Takenaka Komuten Co Ltd ろ過装置
JP2005144230A (ja) * 2003-11-11 2005-06-09 Takenaka Komuten Co Ltd ろ過装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01151815U (fr) * 1988-03-25 1989-10-19
JPH1052615A (ja) * 1996-08-12 1998-02-24 Takenaka Komuten Co Ltd ろ過装置
JP2005144230A (ja) * 2003-11-11 2005-06-09 Takenaka Komuten Co Ltd ろ過装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7498888B2 (ja) 2021-08-25 2024-06-13 株式会社石垣 ろ過処理方法
JP7498887B2 (ja) 2021-08-25 2024-06-13 株式会社石垣 ろ過処理方法

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