WO2022202612A1 - ろ過装置 - Google Patents

ろ過装置 Download PDF

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Publication number
WO2022202612A1
WO2022202612A1 PCT/JP2022/012300 JP2022012300W WO2022202612A1 WO 2022202612 A1 WO2022202612 A1 WO 2022202612A1 JP 2022012300 W JP2022012300 W JP 2022012300W WO 2022202612 A1 WO2022202612 A1 WO 2022202612A1
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WO
WIPO (PCT)
Prior art keywords
electrode
potential
filter chamber
rotating member
filtration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/012300
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English (en)
French (fr)
Japanese (ja)
Inventor
一樹 大森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Kakoki Kaisha Ltd
Original Assignee
Mitsubishi Kakoki Kaisha Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/JP2021/011686 external-priority patent/WO2022201239A1/ja
Priority claimed from PCT/JP2021/011685 external-priority patent/WO2022201238A1/ja
Application filed by Mitsubishi Kakoki Kaisha Ltd filed Critical Mitsubishi Kakoki Kaisha Ltd
Priority to JP2023509103A priority Critical patent/JP7621457B2/ja
Publication of WO2022202612A1 publication Critical patent/WO2022202612A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/38—Feed or discharge devices
    • 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
    • B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/06—Filters making use of electricity or magnetism

Definitions

  • the present disclosure relates to filtering devices.
  • Solid-liquid separation using electroosmosis is a method in which voltage and pressure are applied to a cake layer sandwiched between electrodes, and moisture in the cake layer is expelled through a filter medium by electroosmosis.
  • Solid-liquid separation using electrophoresis is a method of separating particles in a slurry by moving the particles in the slurry by electrophoresis and bringing them into direct contact with a filter medium.
  • An object of the present disclosure is to provide a filtration device capable of improving the filtration speed.
  • a filtration device includes a housing, a first filter chamber that is an internal space of the housing, a filtration unit attached to the housing so as to be in contact with the first filter chamber, and a filter that rotates with respect to the housing.
  • a rotating member supported by the housing such that it can rotate; and a driving device for rotating the rotating member.
  • a second electrode provided facing one surface of the first electrode, and a plurality of openings provided between the first electrode and the second electrode a filter medium; and a second filter chamber provided in contact with a surface of the second electrode opposite to the filter medium, and the rotary member is positioned between the first electrode and the first filter chamber. It includes opposing third electrodes.
  • a filtration device includes a housing, a first filter chamber that is an internal space of the housing, a plurality of filtration units attached to the housing so as to be in contact with the first filter chamber, and a rotating member supported by the housing so as to be rotatable relative to the housing; and a driving device for rotating the rotating member.
  • a second electrode provided with a second opening and provided facing one surface of the first electrode, and a plurality of openings provided between the first electrode and the second electrode and a second filter chamber provided in contact with a surface of the second electrode on the side opposite to the filter medium, wherein the rotating member rotates the first filter chamber across the first filter chamber.
  • a plurality of filtering units, including one electrode and a third electrode facing each other, are arranged side by side in a direction along the rotation axis of the rotating member.
  • the filtration device of the present disclosure it is possible to improve the filtration speed.
  • FIG. 1 is a cross-sectional view of a filtering device according to Embodiment 1.
  • FIG. 2 is an enlarged view of part A in FIG.
  • FIG. 3 is an enlarged view of a portion B in FIG. 1.
  • FIG. 4 is an enlarged view of part C in FIG. 5 is a perspective view of a rotating member and a filtration unit according to Embodiment 1.
  • FIG. 6 is an exploded perspective view of a rotating member and a filtration unit according to Embodiment 1.
  • FIG. 7 is an exploded perspective view of a rotating member and a filtration unit according to Embodiment 1.
  • FIG. 8 is an exploded perspective view of a rotating member and a filtration unit according to Embodiment 1.
  • FIG. FIG. FIG. 2 is an enlarged view of part A in FIG.
  • FIG. 3 is an enlarged view of a portion B in FIG. 1.
  • FIG. 9 is a schematic diagram of a filtering device according to Embodiment 1.
  • FIG. 10 is a cross-sectional view schematically showing the configuration of the first electrode, filter medium and second electrode.
  • 11 is an equivalent circuit diagram showing the filtering device according to Embodiment 1.
  • FIG. 12 is an equivalent circuit diagram showing a filtration unit according to Modification 1 of Embodiment 1.
  • FIG. 13 is a cross-sectional view of a filtering device according to Embodiment 2.
  • FIG. 14 is a front view of a filtering device according to Embodiment 2.
  • FIG. FIG. 15 is a cross-sectional view of the filtration device according to the embodiment in which the axis of rotation is parallel to the vertical direction.
  • FIG. 1 is a cross-sectional view of a filtering device according to Embodiment 1.
  • FIG. The filtration device 10 according to Embodiment 1 is a device that separates particles from a slurry (undiluted solution) in which particles are dispersed in a liquid.
  • the filtration device 10 can be applied to the life science field, the sewage treatment field, the wastewater treatment field, and the like.
  • life science the bio industry that cultures microorganisms such as cultured cells, microalgae, bacteria, bacteria, viruses, etc., and the use and application of enzymes, proteins, polysaccharides, lipids, etc. produced by cultured microorganisms in vitro and in the body.
  • the filtration device 10 is a colloidal particle-based slurry in which surface-charged fine particles are highly dispersed by electrical repulsion, and can be applied to concentration and recovery of colloidal fine particles.
  • the filter device 10 includes a housing 80, a first filter chamber 30, a supply unit 81, a discharge unit 83, a rotating member 40, a drive device 13, and a filter unit. 100 and.
  • the housing 80 is a member that supports the rotating member 40 and the filtration unit 100.
  • the housing 80 has a space inside.
  • the housing 80 can house the rotating member 40 and the filtration unit 100 therein.
  • Housing 80 is fixed to base 200 placed on installation surface 300 .
  • housing 80 includes third connection conductors 853 and brushes 854 .
  • the third connection conductor 853 has conductivity.
  • a third connection conductor 853 is attached to one end of the housing 80 .
  • the brush 854 has conductivity and is connected to the third connection conductor 853 .
  • the first filter chamber 30 is the internal space of the housing 80 .
  • the supply unit 81 is attached to the housing 80 as shown in FIG. A gap between the supply unit 81 and the housing 80 is sealed by a sealing member.
  • the supply unit 81 supplies slurry (stock solution) to the first filter chamber 30 .
  • the supply unit 81 has a supply port 811 which is an opening provided on the outer peripheral surface.
  • a pipe is connected to the supply port 811 .
  • Slurry (undiluted solution) pressurized by a pressurizing device or the like is supplied to the first filter chamber 30 via the pipe and the supply port 811 .
  • the discharge unit 83 is attached to the housing 80 as shown in FIG. A gap between the discharge unit 83 and the housing 80 is sealed by a sealing member.
  • the discharge unit 83 discharges the concentrated slurry (stock solution) in the first filter chamber 30 to the outside.
  • the discharge unit 83 has a concentrated liquid discharge port 831, which is an opening provided on the outer peripheral surface.
  • a pipe is connected to the concentrated liquid outlet 831 . Due to the pressure difference between the inside and outside of the first filter chamber 30, the concentrated slurry (raw liquid) in the first filter chamber 30 is discharged to the outside through the concentrated liquid discharge port 831 and piping.
  • a decompression device such as a vacuum pump may be provided in the pipe connected to the concentrated liquid outlet 831 .
  • the rotating member 40 is arranged inside the housing 80 .
  • Rotating member 40 is supported by housing 80 .
  • Rotating member 40 is rotatable relative to housing 80 .
  • the rotating member 40 rotates around the rotation axis R.
  • the rotation axis R is parallel to the horizontal direction. 1 to 4, the left-right direction of the paper surface is the horizontal direction.
  • a direction parallel to the rotation axis R will be referred to as an axial direction.
  • Directions parallel to a straight line perpendicular to the axis of rotation R are described as radial directions.
  • a direction along the circumference about the axis of rotation R is simply referred to as a circumferential direction.
  • the rotating member 40 includes a shaft 41, two flanges 43, and a third electrode 33.
  • the shaft 41 is a rod-shaped member.
  • the shaft 41 is connected with the driving device 13 .
  • a gap between the shaft 41 and the housing 80 is sealed by a seal member.
  • the shaft 41 includes an internal conductor 412 having electrical conductivity. As shown in FIG. 2, one end of internal conductor 412 contacts brush 854 . Therefore, the internal conductor 412 is electrically connected to the third connection conductor 853 .
  • the flange 43 is provided on the outer peripheral surface of the shaft 41.
  • the flange 43 contacts the first filter chamber 30 .
  • the two flanges 43 are arranged on both sides of the filtration unit 100 .
  • the flange 43 is formed in a substantially disc shape.
  • the two flanges 43 include a first flange 43a and a second flange 43b.
  • the first flange 43a and the second flange 43b have the same structure and are arranged at different positions in the axial direction.
  • the first flange 43 a is arranged on the supply unit 81 side with respect to the filtration unit 100 .
  • the first flange 43a overlaps the supply unit 81 when viewed from the radial direction.
  • the second flange 43 b is arranged on the discharge unit 83 side with respect to the filtration unit 100 .
  • the second flange 43b overlaps the discharge unit 83 when viewed from the radial direction.
  • the flange 43 includes a mounting portion 431, a stirring portion 433, and an internal conductor 437.
  • the mounting portion 431 is a portion that supports the third electrode 33 .
  • a third electrode 33 is attached to the axially facing surface of the attachment portion 431 .
  • the third electrode 33 is a plate-like member and faces the first filter chamber 30 .
  • the mounting portion 431 is provided at a radially outer end portion of the flange 43 .
  • the stirring portion 433 is provided radially inward (on the shaft 41 side) of the mounting portion 431 .
  • the stirrer 433 has a plurality of grooves 434 .
  • a groove 434 is provided from the shaft 41 to the mounting portion 431 .
  • the groove 434 describes an arc when viewed from the axial direction.
  • the plurality of grooves 434 includes a plurality of first grooves 435 and a plurality of second grooves 436 .
  • the first groove 435 is arranged on one of the two axially facing surfaces of the stirring part 433 .
  • the plurality of first grooves 435 are arranged at regular intervals along the circumferential direction. As shown in FIG. 7, the first groove 435 forms an arc that is convex in the direction opposite to the rotation direction DR of the rotating member 40 when viewed from the axial direction. Therefore, when the rotating member 40 rotates, the slurry (undiluted solution) in contact with the first groove 435 is guided radially inward (toward the shaft 41 side).
  • the second groove 436 is arranged on the other of the two axially facing surfaces of the stirring part 433 . That is, the second groove 436 is arranged behind the first groove 435 .
  • the plurality of second grooves 436 are arranged at regular intervals along the circumferential direction. As shown in FIG. 8, the first groove 435 draws an arc that is convex toward the rotation direction DR of the rotating member 40 when viewed from the axial direction. Therefore, when the rotating member 40 rotates, the slurry (undiluted solution) in contact with the second groove 436 is guided radially outward (to the side opposite to the shaft 41 side).
  • the first groove 435 faces the filtration unit 100 in the first flange 43a. Therefore, the slurry (undiluted solution) between the first flange 43a and the filtration unit 100 is guided radially inward.
  • the second groove 436 faces the filtration unit 100 on the second flange 43b. Therefore, the slurry (undiluted solution) between the second flange 43b and the filtration unit 100 is guided radially outward.
  • the internal conductor 437 is connected with the internal conductor 412 of the shaft 41 . Also, the internal conductor 437 is connected to the third electrode 33 . Therefore, the third electrode 33 is electrically connected to the third connection conductor 853 .
  • the driving device 13 is a device that rotates the rotating member 40 .
  • the driving device 13 includes an electric motor and a speed reducer.
  • the electric motor is connected to the shaft 41 of the rotating member 40 via a speed reducer.
  • the torque generated by the electric motor is increased by the speed reducer and then transmitted to the shaft 41 .
  • the filtration unit 100 is attached to the housing 80 as shown in FIG.
  • Filtration unit 100 is arranged between supply unit 81 and discharge unit 83 .
  • a portion of the filtration unit 100 is located between the two flanges 43 of the first filter chamber 30 .
  • the filtration unit 100 includes a case 110, a first electrode 31, a second electrode 32, a filter medium 34, a second filter chamber 35, a filtrate outlet 105, a second It has a first connection conductor 101 and a second connection conductor 102 .
  • Case 110 is a member that holds first electrode 31 , second electrode 32 , and filter medium 34 .
  • Case 110 is made of a conductive material.
  • the first electrode 31, the second electrode 32 and the filter material 34 are attached to the case 110.
  • the first electrode 31, the second electrode 32 and the filter medium 34 are annular.
  • the first electrode 31 , the second electrode 32 and the filter medium 34 are provided on both sides of the second filter chamber 35 . That is, the filtration unit 100 includes two first electrodes 31 , two second electrodes 32 , two filter media 34 and one second filter chamber 35 .
  • FIG. 9 is a schematic diagram of the filtering device according to Embodiment 1.
  • the first electrode 31 and the second electrode 32 are mesh electrodes.
  • the first electrode 31 has a plurality of thin conductive wires 31a, and a plurality of first openings 31b are provided between the thin conductive wires 31a.
  • the second electrode 32 has a plurality of thin conductive wires 32a, and a plurality of second openings 32b are provided between the thin conductive wires 32a.
  • the second electrode 32 is provided facing one surface of the first electrode 31 with the filter medium 34 interposed therebetween. In other words, the filter material 34 is provided between the first electrode 31 and the second electrode 32 .
  • the first electrode 31 and the second electrode 32 are provided in direct contact with the filter medium 34 .
  • the first electrode 31 faces the third electrode 33 with the first filter chamber 30 interposed therebetween.
  • the second electrode 32 faces the second filter chamber 35 .
  • the plurality of thin conductive wires 31a and the plurality of thin conductive wires 32a may be metal or carbon fiber.
  • the first electrode 31 and the second electrode 32 are not limited to being in direct contact with the filter medium 34, and may be arranged with a gap between them.
  • the filter medium 34 includes a filtration membrane 34a and an opening 34b. A plurality of openings 34b are provided in the filtration membrane 34a. An electric field acts on the filtration membrane 34a.
  • a microfiltration membrane MF membrane (Microfiltration Membrane)
  • the filter material 34 is made of an insulating material such as a resin material, and the first electrode 31 and the second electrode 32 are insulated by the filter material 34 .
  • the first opening 31b of the first electrode 31, the second opening 32b of the second electrode 32, and the opening 34b of the filter medium 34 are shown to have the same size. The sizes of the first opening 31b, the second opening 32b and the opening 34b may be different.
  • FIG. 10 is a cross-sectional view schematically showing the configuration of the first electrode, filter medium and second electrode.
  • the diameter D3 of the mesh opening 34b provided in the filter medium 34 is smaller than the diameter D1 of the first opening 31b of the first electrode 31 and the diameter D1 of the second opening 32b of the second electrode 32. smaller than the diameter D2.
  • the arrangement pitch of the plurality of conductive fine wires 31a, the arrangement pitch of the plurality of conductive fine wires 32a, and the arrangement pitch of the filtration membranes 34a are provided mutually different.
  • the diameter D1 of the first opening 31b of the first electrode 31 is 0.5 ⁇ m or more and 500 ⁇ m or less, for example, about 70 ⁇ m.
  • a diameter D2 of the second opening 32b of the second electrode 32 is 0.5 ⁇ m or more and 1000 ⁇ m or less, for example, about 100 ⁇ m.
  • a diameter D3 of the plurality of openings 34b provided in the filter medium 34 is approximately 0.1 ⁇ m to 100 ⁇ m, more preferably approximately 1 ⁇ m to 7 ⁇ m.
  • the diameter D1 of the first opening 31b of the first electrode 31 is smaller than the diameter D2 of the second opening 32b of the second electrode 32.
  • the diameter D1 of the first opening 31b of the first electrode 31 may be formed to have the same size as the diameter D2 of the second opening 32b of the second electrode 32 .
  • the openings 34b of the filter material 34 are provided so as not to overlap the plurality of thin conductive wires 31a and the plurality of thin conductive wires 32a at least in the regions overlapping the first openings 31b and the second openings 32b.
  • the distance between the first electrode 31 and the second electrode 32 is defined by the thickness of the filter medium 34 .
  • the second filter chamber 35 is the internal space of the case 110 .
  • the second filter chamber 35 is arranged between the two second electrodes 32 .
  • the second filter chamber 35 is connected to the filtrate outlet 105 .
  • the filtrate outlet 105 is an opening provided on the outer peripheral surface of the case 110 .
  • a pipe is connected to the filtrate outlet 105 .
  • the filtrate 75 in the second filter chamber 35 is discharged to the outside of the filtration unit 100 via the filtrate discharge port 105 and piping.
  • the first connection conductor 101 is attached to the outer peripheral surface of the case 110 .
  • the first connection conductor 101 has conductivity.
  • the first electrode 31 is electrically connected to the first connection conductor 101 through the case 110 .
  • the second connection conductor 102 is attached to the case 110 via an insulating material. A portion of the second connection conductor 102 is inserted inside the case 110 .
  • the second connection conductor 102 is connected to the second electrode 32 from the second filter chamber 35 side.
  • the filtering device 10 includes a first power supply 51, a second power supply 52, and a third power supply 53.
  • the first electrode 31 is electrically connected to the second terminal 51b of the first power supply 51 via the first connection conductor 101 (see FIG. 3). Also, the first electrode 31 is electrically connected to the first terminal 52a of the second power supply 52 via the first connection conductor 101 (see FIG. 3).
  • the second electrode 32 is electrically connected to the second terminal 52b of the second power supply 52 via the second connection conductor 102 (see FIG. 3).
  • the third electrode 33 is electrically connected to the first terminal 53a of the third power supply 53 via the third connection conductor 853 (see FIG. 2).
  • the second terminal 53b of the third power supply 53 and the first terminal 51a of the first power supply 51 are connected to the reference potential GND.
  • the reference potential GND is, for example, the ground potential.
  • the reference potential GND is not limited to this, and may be a predetermined fixed potential.
  • the first power supply 51 supplies the first electrode 31 with a first potential V1 having the same polarity as the particles 71 .
  • the first potential V1 is, for example, -30V.
  • the second power supply 52 supplies the second electrode 32 with a second potential V2 having the same polarity as that of the particles 71 and a larger absolute value than the first potential V1.
  • the second potential V2 is -40V, for example.
  • the third power supply 53 supplies the third electrode 33 with a third potential V3 having a polarity different from that of the particles 71 .
  • the third potential V3 is, for example, +30V.
  • the absolute values of the first potential V1, the second potential V2, and the third potential can be set within a range of 1 mV or more and 1000 V or less.
  • FIG. 11 is an equivalent circuit diagram showing the filtering device according to Embodiment 1.
  • the first power source 51 and the third power source 53 are constant voltage sources, and the second power source 52 is a constant current source.
  • a resistance component R1 and a capacitance component C are connected in parallel between the first electrode 31 and the second electrode 32 .
  • the resistance component R1 and the capacitance component C are equivalently represented by the filter medium 34 provided with a large number of openings 34b.
  • a resistance component R2 is connected between the first electrode 31 and the third electrode 33 .
  • the resistance component R2 is equivalently represented by the slurry (undiluted solution) 70 in the first filter chamber 30 .
  • the second power supply 52 may be a constant voltage power supply or a constant current power supply.
  • the second power supply 52 is a constant current source, so depending on the state of filtration of the filter device 10, that is, changes in the resistance component R1 of the filter medium 34 and the resistance component R2 of the first filter chamber 30, Accordingly, the second potential V2 changes.
  • the second potential V2 has the same polarity as the particle 71 and maintains a value greater than the absolute value of the first potential V1.
  • a repulsive force acts on the particles 71 of the slurry (undiluted solution) 70 from the slurry (undiluted solution) 70 due to the driving of each electrode.
  • Slurry (stock solution) 70 from which particles 71 have been separated flows through first electrode 31 , second electrode 32 and filter medium 34 into second filter chamber 35 .
  • the filtrate 75 in the second filter chamber 35 is discharged to the outside of the second filter chamber 35 through the filtrate discharge port 105 .
  • the particles 71 are, for example, biomass particles or colloidal particles, and the particle surfaces are negatively charged. Specifically, the particles 71 are chlorella, microalgae spirulina, colloidal silica, Escherichia coli, activated sewage sludge, or the like.
  • the diameter of the particles 71 varies depending on the technical field to which it is applied and the type of separation object, but is approximately 5 nm or more and 2000 ⁇ m or less, for example, approximately 20 nm or more and 500 ⁇ m or less.
  • the liquid 72 in which the particles 71 are dispersed is water, and the water molecules 73 are positively charged. As a result, the slurry (undiluted solution) 70 as a whole is in an electrically balanced state.
  • the liquid 72 is not limited to water and may be alcohol or the like. That is, the liquid 72 should just be a polar solvent.
  • the slurry (undiluted solution) 70 further contains chromoprotein 74 .
  • Chromoprotein 74 is charged to the same polarity (negatively) as particles 71 and has a smaller particle size than particles 71 .
  • the chromoprotein 74 is 10 nm or more and 300 nm or less, for example, about 30 nm. Note that the chromoprotein 74 may be omitted.
  • the particles 71 positioned near the first electrode 31 generate a stronger repulsive force
  • the particles 71 positioned closer to the third electrode 33 generate a stronger attractive force.
  • the repulsive force and attractive force generated in the particles 71 act in the direction indicated by the arrow F1, that is, the direction away from the first electrode 31 and closer to the third electrode 33 .
  • the negatively charged particles 71 move toward the third electrode 33 by electrophoresis.
  • the filtering device 10 can prevent the particles 71 from accumulating on the surface of the first electrode 31 and the surface of the filter medium 34 to form a cake layer. In other words, it is possible to suppress an increase in filtration resistance of the mesh openings 34b of the filter medium 34 .
  • an attractive force is generated between the positively charged water molecules 73 and the first electrode 31 .
  • the attractive force acting on the positively charged water molecules 73 acts in the direction indicated by the arrow F2, that is, in the direction from the third electrode 33 to the first electrode 31 .
  • the positively charged water molecules 73 move to the first electrode 31 side.
  • an electric field is formed from the first electrode 31 to the second electrode 32 so as to penetrate the filter medium 34 in the thickness direction.
  • the water molecules 73 that have moved to the first electrode 31 side receive force from the electric field, are pulled toward the second electrode 32 side, and pass through the filter medium 34 .
  • the positively charged water molecules 73 move, the water molecules are dragged toward the second electrode 32 to form an electroosmotic flow.
  • the liquid 72 containing the positively charged water molecules 73 flows into the second filter chamber 35 .
  • the particles 71 are separated from the first electrode 31 by electrophoresis and move to the third electrode 33 side.
  • the concentration of particles 71 in the slurry (stock solution) 70 in 30 can be increased.
  • the filtering device 10 performs electrophoresis in which the particles 71 are moved by the repulsive force F (the repulsive force generated between the particles 71 and the first electrode 31) between the first electrode 31 and the third electrode 33. , and electroosmosis, in which the electric field between the first electrode 31 and the second electrode 32 moves the water molecules 73 through the filter medium 34 , so that the particles 71 can be separated.
  • cakes are formed on the surface of the first electrode 31 and the surface of the filter medium 34 .
  • the formation of layers can be suppressed, and the filtration rate can be improved several times to ten times or more.
  • the degree of concentration of the particles 71 of the slurry (undiluted solution) 70 in the first filter chamber 30 can be increased compared to the method of simply applying pressure to the slurry (undiluted solution) 70 .
  • the frequency of cleaning and replacement of the filter medium 34 can be reduced, and the slurry (undiluted solution) 70 can be filtered efficiently.
  • the filtration rate is about the same as the conventional one. can be realized. That is, the filtering device 10 can be made smaller.
  • the particle level (particle diameter) passing through the filter medium 34 can also be controlled.
  • a shield is formed between the first electrode 31 and the second electrode 32. is formed, the chromoprotein 74 having a particle size smaller than the opening 34 b of the filter medium 34 can be suppressed from passing through the filter medium 34 .
  • an ultrafiltration membrane (UF membrane) is a filtration membrane with an opening diameter of approximately 10 nm or more and 100 nm or less.
  • a nanofiltration membrane (NF membrane) is a filtration membrane having an opening diameter of about 1 nm or more and 10 nm or less.
  • the configuration of the filtering device 10 described above is merely an example, and can be changed as appropriate.
  • the negative filter plate formed by laminating the first electrode 31, the filter medium 34, and the second electrode 32 and the third electrode 33 are arranged to face each other in a parallel plate shape.
  • the negative filter plate formed by stacking the first electrode 31, the filter medium 34 and the second electrode 32, and the third electrode 33 may each have a curved surface.
  • the shape and arrangement of the negative filter plate and the third electrode 33 can be appropriately changed according to the shape and structure of the filtering device 10 .
  • the concentration of the slurry (undiluted solution) 70 supplied to the first filter chamber 30 is not particularly limited, and can be changed according to the field to which the filter device 10 is applied.
  • the internal pressure of the first filter chamber 30 is pressurized and is higher than the internal pressure of the second filter chamber 35 .
  • the internal pressure of the first filter chamber 30 is made relatively higher than the internal pressure of the second filter chamber 35 by reducing the internal pressure of the second filter chamber 35 by vacuuming or the like. You may do so.
  • first potential V1, the second potential V2, and the third potential V3 are preferably changed as appropriate according to the type of the particles 71 to be separated and the required filtration characteristics.
  • the filtering device 10 does not have to be equipped with the third power source 53 .
  • 12 is an equivalent circuit diagram showing a filtration unit according to Modification 1 of Embodiment 1.
  • FIG. 12 in Modification 1 of Embodiment 1, the third electrode 33 is connected to, for example, the reference potential GND.
  • the size of the filtering device 10 can be reduced compared to the case where each of the first electrode 31, the second electrode 32, and the third electrode 33 is provided with a power source.
  • the filtering device 10 of Embodiment 1 includes the housing 80, the first filtering chamber 30, the filtering unit 100, the rotating member 40, and the driving device 13.
  • the first filter chamber 30 is the internal space of the housing 80 .
  • the filtration unit 100 is attached to the housing 80 so as to be in contact with the first filter chamber 30 .
  • Rotating member 40 is supported by housing 80 so as to be rotatable relative to housing 80 .
  • the driving device 13 rotates the rotating member 40 .
  • the filtration unit 100 includes a first electrode 31 , a second electrode 32 , a filter medium 34 and a second filter chamber 35 .
  • the first electrode 31 is provided with a plurality of first openings 31b.
  • the second electrode 32 is provided with a plurality of second openings 32b and is provided to face one surface of the first electrode 31 .
  • the filter medium 34 is provided with a plurality of openings 34 b and is provided between the first electrode 31 and the second electrode 32 .
  • the second filter chamber 35 is provided in contact with the surface of the second electrode 32 opposite to the filter medium 34 .
  • the rotating member 40 includes a third electrode 33 facing the first electrode 31 with the first filter chamber 30 interposed therebetween.
  • the repulsive force F generated in the particles 71 between the first electrode 31 and the third electrode 33 causes the particles 71 to move away from the first electrode 31. It moves in the direction toward the third electrode 33 .
  • the particles 71 can be separated by electroosmosis in which the water molecules 73 are moved by the electric field between the first electrode 31 and the second electrode 32 and permeate the filter medium 34, and the slurry in the first filter chamber 30 (undiluted solution ) 70 can increase the concentration of particles 71 .
  • the filtration speed can be improved several times to ten times or more. can be done. Furthermore, the rotation of the rotating member 40 including the third electrode 33 promotes the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 . Therefore, the filtration speed can be further improved as compared with the case where only the pressure is applied to the slurry (undiluted solution) 70 in the first filter chamber 30 .
  • the first electrode 31, the second electrode 32, and the filter medium 34 are provided on both sides of the second filter chamber 35.
  • one set of the first electrode 31, the second electrode 32, and the filter medium 34 and the other set of the first electrode 31, the second electrode 32, and the filter medium 34 form one second filter chamber. 35 can be shared. Therefore, the filtration device 10 can achieve both an improvement in filtration area and a reduction in size.
  • the rotating member 40 includes a shaft 41 and a plurality of flanges 43 provided on the outer peripheral surface of the shaft 41 .
  • the flange 43 includes an attachment portion 431 to which the third electrode 33 is attached, and a disk-shaped stirring portion 433 having a plurality of grooves 434 facing the first filter chamber 30 on its surface.
  • the slurry (undiluted solution) 70 in the first filter chamber 30 enters the groove 434 .
  • the rotating member 40 rotates, the slurry (undiluted solution) 70 in the grooves 434 is pushed out. Therefore, the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 is promoted. Therefore, the filtration device 10 can further improve the filtration speed.
  • the grooves 434 are formed by the first grooves 435 provided on the surface of the stirring portion 433 on one side in the axial direction parallel to the rotation axis R of the rotating member 40, and and a second groove 436 provided in the other surface.
  • the first groove 435 draws an arc that is convex in the direction opposite to the rotation direction DR of the rotating member 40 .
  • the second groove 436 draws a convex circular arc in the rotation direction DR of the rotating member 40 .
  • the slurry (undiluted solution) 70 flows radially inward, and in the portion of the first filter chamber 30 on the other side of the flange 43, the slurry (Undiluted solution) 70 flows radially outward. Therefore, the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 is promoted. Therefore, the filtration device 10 can further improve the filtration speed.
  • the absolute value of the second potential V2 of the second electrode 32 is greater than the absolute value of the first potential V1 of the first electrode 31 .
  • the potential difference between the first potential V1 and the third potential V3 of the third electrode 33 is greater than the potential difference between the first potential V1 and the second potential V2.
  • FIG. 13 is a cross-sectional view of a filtering device according to Embodiment 2.
  • FIG. 14 is a front view of a filtering device according to Embodiment 2.
  • FIG. 15 is a cross-sectional view of the filtration device according to Embodiment 2 in a state in which the rotating shaft is parallel to the vertical direction. As shown in FIG.
  • the filter device 10 includes a housing 80, a first filter chamber 30, a supply unit 81, a discharge unit 83, a rotating member 40, a driving device 13, and a plurality of filter a unit 100;
  • symbol may be attached
  • the housing 80 is a member that supports the rotating member 40 and the filtration unit 100. As shown in FIG. The housing 80 has a space inside. The housing 80 can house the rotating member 40 and the filtration unit 100 therein. Housing 80 is fixed to base 200 placed on installation surface 300 . As shown in FIGS. 14 and 15, the orientation of the housing 80 with respect to the base 200 can be changed. As shown in FIG. 14, the housing 80 is connected to the base 200 via a rotation support mechanism 250. As shown in FIG. The rotation support mechanism 250 is fixed to the base 200 and supports the housing 80 so that the housing 80 can rotate around a horizontal axis of rotation. As shown in FIG. 2 , housing 80 includes third connection conductors 853 and brushes 854 .
  • the third connection conductor 853 has conductivity.
  • a third connection conductor 853 is attached to one end of the housing 80 .
  • the brush 854 has conductivity and is connected to the third connection conductor 853 .
  • the first filter chamber 30 is the internal space of the housing 80 .
  • the supply unit 81 is attached to the housing 80 as shown in FIG. A gap between the supply unit 81 and the housing 80 is sealed by a sealing member.
  • the supply unit 81 supplies slurry (stock solution) to the first filter chamber 30 .
  • the supply unit 81 has a supply port 811 which is an opening provided on the outer peripheral surface.
  • a pipe is connected to the supply port 811 .
  • Slurry (undiluted solution) pressurized by a pressurizing device or the like is supplied to the first filter chamber 30 via the pipe and the supply port 811 .
  • the discharge unit 83 is attached to the housing 80 as shown in FIG. A gap between the discharge unit 83 and the housing 80 is sealed by a sealing member.
  • the discharge unit 83 discharges the concentrated slurry (stock solution) in the first filter chamber 30 to the outside.
  • the discharge unit 83 has a concentrated liquid discharge port 831, which is an opening provided on the outer peripheral surface.
  • a pipe is connected to the concentrated liquid outlet 831 . Due to the pressure difference between the inside and outside of the first filter chamber 30, the concentrated slurry (raw liquid) in the first filter chamber 30 is discharged to the outside through the concentrated liquid discharge port 831 and piping.
  • a decompression device such as a vacuum pump may be provided in the pipe connected to the concentrated liquid outlet 831 .
  • the rotating member 40 is arranged inside the housing 80 .
  • Rotating member 40 is supported by housing 80 .
  • Rotating member 40 is rotatable relative to housing 80 .
  • the rotating member 40 rotates around the rotation axis R.
  • the rotation axis R is parallel to the horizontal direction.
  • the left-right direction of the paper is the horizontal direction.
  • a direction parallel to the rotation axis R will be referred to as an axial direction.
  • Directions parallel to a straight line perpendicular to the axis of rotation R are described as radial directions.
  • a direction along the circumference about the axis of rotation R is simply referred to as a circumferential direction.
  • the rotation axis R is parallel to the horizontal direction.
  • the rotation axis R is parallel to the vertical direction.
  • the rotating member 40 includes a shaft 41 , a plurality of flanges 43 and a third electrode 33 .
  • the shaft 41 is a rod-shaped member.
  • the shaft 41 is connected with the driving device 13 .
  • a gap between the shaft 41 and the housing 80 is sealed by a seal member.
  • the flange 43 is provided on the outer peripheral surface of the shaft 41 .
  • the flange 43 contacts the first filter chamber 30 .
  • Each flange 43 is arranged between two axially aligned filtration units 100 .
  • the flanges 43 and the filter units 100 are alternately arranged along the axial direction.
  • the flange 43 is formed in a substantially disc shape.
  • the flange 43 closest to the supply unit 81 among the plurality of flanges 43 overlaps the supply unit 81 when viewed from the radial direction.
  • the flange 43 closest to the discharge unit 83 among the plurality of flanges 43 overlaps the discharge unit 83 when viewed from the radial direction.
  • the first groove 435 forms an arc that is convex in the direction opposite to the rotation direction DR of the rotating member 40 when viewed from the axial direction. Therefore, when the rotating member 40 rotates, the slurry (undiluted solution) in contact with the first groove 435 is guided radially inward (toward the shaft 41 side). That is, the slurry (undiluted solution) between the first groove 435 and the filtration unit 100 is guided radially inward.
  • the second groove 436 is arranged on the other of the two axially facing surfaces of the stirring part 433 . That is, the second groove 436 is arranged behind the first groove 435 .
  • the plurality of second grooves 436 are arranged at regular intervals along the circumferential direction.
  • the first groove 435 draws an arc that is convex toward the rotation direction DR of the rotating member 40 when viewed from the axial direction. Therefore, when the rotating member 40 rotates, the slurry (undiluted solution) in contact with the second groove 436 is guided radially outward (to the side opposite to the shaft 41 side). That is, the slurry (undiluted solution) between the second groove 436 and the filtration unit 100 is guided radially outward.
  • the slurry (undiluted solution) guided radially inward by the first groove 435 moves axially through the gap between the inner peripheral surface of the filtration unit 100 and the outer peripheral surface of the shaft 41 .
  • the slurry (undiluted solution) guided radially outward by the second groove 436 moves axially through the gap between the inner peripheral surface of the housing 80 and the outer peripheral surface of the flange 43 .
  • the slurry (undiluted solution) advances from the supply unit 81 toward the discharge unit 83 through the meandering flow path formed between the rotating member 40 and the filtration unit 100 by repeating the movement described above.
  • multiple filtration units 100 are attached to the housing 80 . All filtration units 100 are arranged between the supply unit 81 and the discharge unit 83 .
  • the plurality of filtration units 100 are arranged side by side along the horizontal direction. That is, the rotation axis R is parallel to the horizontal direction.
  • the plurality of filtration units 100 are arranged side by side along the vertical direction. That is, the rotation axis R is parallel to the vertical direction.
  • a portion of one filtration unit 100 is arranged between the two flanges 43 of the first filter chamber 30 .
  • the filter device 10 of this embodiment includes the housing 80, the first filter chamber 30, the plurality of filter units 100, the rotating member 40, and the driving device 13.
  • the first filter chamber 30 is the internal space of the housing 80 .
  • a plurality of filtration units 100 are attached to the housing 80 so as to be in contact with the first filter chamber 30 .
  • Rotating member 40 is supported by housing 80 so as to be rotatable relative to housing 80 .
  • the driving device 13 rotates the rotating member 40 .
  • the filtration unit 100 includes a first electrode 31 , a second electrode 32 , a filter medium 34 and a second filter chamber 35 .
  • the first electrode 31 is provided with a plurality of first openings 31b.
  • the second electrode 32 is provided with a plurality of second openings 32b and is provided to face one surface of the first electrode 31 .
  • the filter medium 34 is provided with a plurality of openings 34 b and is provided between the first electrode 31 and the second electrode 32 .
  • the second filter chamber 35 is provided in contact with the surface of the second electrode 32 opposite to the filter medium 34 .
  • the rotating member 40 includes a third electrode 33 facing the first electrode 31 with the first filter chamber 30 interposed therebetween.
  • a plurality of filtration units 100 are arranged side by side in the direction along the rotation axis R of the rotating member 40 .
  • the repulsive force F generated in the particles 71 between the first electrode 31 and the third electrode 33 causes the particles 71 to move away from the first electrode 31. It moves in the direction toward the third electrode 33 .
  • the particles 71 can be separated by electroosmosis in which the water molecules 73 are moved by the electric field between the first electrode 31 and the second electrode 32 and permeate the filter medium 34, and the slurry in the first filter chamber 30 (undiluted solution ) 70 can increase the concentration of particles 71 .
  • the filtration speed can be improved several times to ten times or more. can be done. Furthermore, the rotation of the rotating member 40 including the third electrode 33 promotes the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 . Therefore, the filtration speed can be further improved as compared with the case where only the pressure is applied to the slurry (undiluted solution) 70 in the first filter chamber 30 .
  • the first electrode 31, the second electrode 32, and the filter medium 34 are provided on both sides of the second filter chamber 35.
  • one set of the first electrode 31, the second electrode 32, and the filter medium 34 and the other set of the first electrode 31, the second electrode 32, and the filter medium 34 form one second filter chamber. 35 can be shared. Therefore, the filtration device 10 can achieve both an improvement in filtration area and a reduction in size.
  • the rotating member 40 includes a shaft 41 and a plurality of flanges 43 provided on the outer peripheral surface of the shaft 41 .
  • the flange 43 includes an attachment portion 431 to which the third electrode 33 is attached, and a disk-shaped stirring portion 433 having a plurality of grooves 434 facing the first filter chamber 30 on its surface.
  • the slurry (undiluted solution) 70 in the first filter chamber 30 enters the groove 434 .
  • the rotating member 40 rotates, the slurry (undiluted solution) 70 in the grooves 434 is pushed out. Therefore, the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 is promoted. Therefore, the filtration device 10 can further improve the filtration speed.
  • the filter units 100 and the flanges 43 are alternately arranged side by side in the direction along the rotation axis R of the rotating member 40 .
  • a meandering flow path is formed between the rotating member 40 and the filtration unit 100 . Therefore, the contact area of the slurry (undiluted solution) 70 with the filtration unit 100 tends to increase. Therefore, the filtration device 10 can further improve the filtration speed.
  • the grooves 434 are formed by the first grooves 435 provided on the surface of the stirring portion 433 on one side in the axial direction parallel to the rotation axis R of the rotating member 40, and and a second groove 436 provided in the other surface.
  • the first groove 435 draws an arc that is convex in the direction opposite to the rotation direction DR of the rotating member 40 .
  • the second groove 436 draws a convex circular arc in the rotation direction DR of the rotating member 40 .
  • the slurry (undiluted solution) 70 flows radially inward, and in the portion of the first filter chamber 30 on the other side of the flange 43, the slurry (Undiluted solution) 70 flows radially outward. Therefore, the flow of the slurry (undiluted solution) 70 in the first filter chamber 30 is promoted. Specifically, the slurry (undiluted solution) 70 easily advances from the supply unit 81 toward the discharge unit 83 in the meandering flow path formed between the rotating member 40 and the filtration unit 100 . Therefore, the filtration device 10 can further improve the filtration speed.
  • the absolute value of the second potential V2 of the second electrode 32 is greater than the absolute value of the first potential V1 of the first electrode 31 .
  • the potential difference between the first potential V1 and the third potential V3 of the third electrode 33 is greater than the potential difference between the first potential V1 and the second potential V2.
  • the plurality of filtering units 100 are arranged side by side along the vertical direction.
  • the filtration device 10 can further improve the filtration speed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Electrostatic Separation (AREA)
PCT/JP2022/012300 2021-03-22 2022-03-17 ろ過装置 Ceased WO2022202612A1 (ja)

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PCT/JP2021/011686 WO2022201239A1 (ja) 2021-03-22 2021-03-22 ろ過装置
PCT/JP2021/011685 WO2022201238A1 (ja) 2021-03-22 2021-03-22 ろ過装置
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59115403U (ja) * 1983-12-22 1984-08-04 コトブキ技研工業株式会社 固体粒子懸濁液又は高分子溶質溶液の母液置換洗浄装置
JPS63176512U (https=) * 1987-05-07 1988-11-16
US20040129654A1 (en) * 2000-12-22 2004-07-08 Clements Posten Electric field pressure filtration of biopolymers
JP3548888B2 (ja) * 1998-09-17 2004-07-28 株式会社石垣 連続圧搾脱水装置
CN1557525A (zh) * 2004-01-19 2004-12-29 湘潭大学 一种旋转压滤机的过滤装置
WO2008142868A1 (ja) * 2007-05-24 2008-11-27 Basic Co., Ltd. 浄水器
JP2013527031A (ja) * 2010-04-29 2013-06-27 オムヤ・デイベロツプメント・アー・ゲー スラリーの濃縮のためのシステムおよび方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59115403U (ja) * 1983-12-22 1984-08-04 コトブキ技研工業株式会社 固体粒子懸濁液又は高分子溶質溶液の母液置換洗浄装置
JPS63176512U (https=) * 1987-05-07 1988-11-16
JP3548888B2 (ja) * 1998-09-17 2004-07-28 株式会社石垣 連続圧搾脱水装置
US20040129654A1 (en) * 2000-12-22 2004-07-08 Clements Posten Electric field pressure filtration of biopolymers
CN1557525A (zh) * 2004-01-19 2004-12-29 湘潭大学 一种旋转压滤机的过滤装置
WO2008142868A1 (ja) * 2007-05-24 2008-11-27 Basic Co., Ltd. 浄水器
JP2013527031A (ja) * 2010-04-29 2013-06-27 オムヤ・デイベロツプメント・アー・ゲー スラリーの濃縮のためのシステムおよび方法

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