WO2013103083A1 - Procédé de séparation sur membrane et appareil de séparation sur membrane - Google Patents

Procédé de séparation sur membrane et appareil de séparation sur membrane Download PDF

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Publication number
WO2013103083A1
WO2013103083A1 PCT/JP2012/082678 JP2012082678W WO2013103083A1 WO 2013103083 A1 WO2013103083 A1 WO 2013103083A1 JP 2012082678 W JP2012082678 W JP 2012082678W WO 2013103083 A1 WO2013103083 A1 WO 2013103083A1
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WIPO (PCT)
Prior art keywords
membrane
flat
closed cross
membranes
flat membrane
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Application number
PCT/JP2012/082678
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English (en)
Japanese (ja)
Inventor
庸平 橋本
恭介 高橋
Original Assignee
住友重機械工業株式会社
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.)
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Priority to CN201280062646.1A priority Critical patent/CN104010716B/zh
Publication of WO2013103083A1 publication Critical patent/WO2013103083A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B01D63/082—Flat membrane modules comprising a stack of flat membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/06—Submerged-type; Immersion type
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/20—Prevention of biofouling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a membrane separation method and a membrane separation apparatus for performing solid-liquid separation of raw water and treated water using a flat membrane.
  • This membrane separation method uses a membrane treatment technique for conventional water treatment.
  • the treated water is clarified and a sedimentation basin is not required, so that the entire apparatus is advantageous in that it is compact.
  • the membrane separation method has a problem that the clogging of the membrane proceeds and the amount of filtered water decreases when the operation time elapses. Therefore, membrane cleaning by gas-liquid two-phase flow is widely performed.
  • the present invention provides a membrane separation method and membrane separation that can improve membrane cleaning performance, reduce membrane clogging, and obtain stable filtration performance for a long time in membrane separation using a flat membrane.
  • An object is to provide an apparatus.
  • a flat membrane unit comprising a plurality of flat membranes arranged side by side in a horizontal direction is immersed in a tank containing raw water, and the surface of the flat membrane is washed while gas is diffused.
  • a flat membrane unit is provided between flat membranes adjacent to each other in the juxtaposed direction with a surface not parallel to the facing flat membrane. It has a bubble guide in contact with the facing flat membrane, and has a hollow closed sectional structure extending in the vertical direction by these facing bubble guide and flat membrane, and this closed sectional structure is arranged in parallel.
  • the membrane separation apparatus immerses a flat membrane unit in which a plurality of flat membranes are juxtaposed in a horizontal direction in a tank containing raw water, and the surface of the flat membrane is diffused by gas.
  • a membrane separation apparatus that separates solid and liquid into raw water and treated water at the same time as washing, and the flat membrane unit has a plane that is not parallel to the facing flat membrane between the flat membranes adjacent in the juxtaposed direction.
  • the closed cross-sectional structure is a flow path through which bubbles are generated by aeration.
  • the bubble guide is disposed between the flat membranes adjacent to each other in the juxtaposed direction, and the flat membrane and the bubble guide facing the membrane are vertically extended and arranged in parallel.
  • a hollow closed cross-section structure is formed in which a plurality are arranged in a direction orthogonal to the installation direction, and bubbles due to air flow flow as flow paths in the closed cross-section structure consisting of a flat membrane and a bubble guide.
  • the bubble guide may be constituted by a part of a flat membrane.
  • the ratio of the gas in the flow path may be 0.4 to 0.8.
  • a vertically elongated bullet-like bubble is generated in the flow path in the closed cross-sectional structure, and the bubble is formed between the flat membrane and the bubble guide that form the closed cross-sectional structure. Ascending while touching almost the entire surface, it rises with this bubble, and along the slight gap between the bubble and the membrane surface, the raw water moves downward at a high flow rate in the opposite direction to the bubble. Therefore, it is estimated that a strong shearing force is generated, whereby the cleaning power for the membrane surface can be further improved, clogging of the membrane can be further reduced, and a stable filtration ability can be obtained for a longer time.
  • FIG. 1 is a schematic configuration diagram showing a membrane separation apparatus to which a membrane separation method according to a first embodiment of the present invention is applied. It is an II-II arrow line view of FIG. It is a figure which shows the relationship between the gas ratio of the flow path of a hollow closed cross-section structure, and bubble shape. It is a figure which shows the flat membrane unit of the membrane separator which applied the membrane separation method which concerns on other embodiment of this invention, and is a figure corresponding to FIG. It is a schematic block diagram which shows the membrane separator which applied the membrane separation method which concerns on 2nd Embodiment of this invention. It is a VI-VI arrow line view of FIG.
  • FIG. 1 is a schematic configuration diagram showing a membrane separation apparatus to which a membrane separation method according to an embodiment of the present invention is applied
  • FIG. 2 is a view taken in the direction of arrows II-II in FIG.
  • the membrane separation apparatus 100 is called a so-called submerged membrane separation method (integrated type).
  • the membrane separation device 100 is flat in a tank 1 containing raw water.
  • the air diffuser 2 By immersing the flat membrane unit 10 having the membrane 20 and aeration from the air diffuser 2 disposed below the flat membrane unit 10, both the cleaning of the flat membrane 20 surface and the solid-liquid separation by the flat membrane 20 are performed. Is. Compressed air is supplied to the air diffuser 2 as a predetermined amount of air via the mass flow controller 3.
  • an external pressure type is adopted.
  • the treated water flows from the outside of the flat membrane 20 toward the inside (perpendicular to the paper surface of FIG. 1). Here, the flow is discharged to the outside.
  • the suction pump 4 provided in the line L1 connected to the upper part of the flat membrane unit 10 is pulled to a negative pressure. It is good also as a method of discharging.
  • an internal pressure type using a tubular membrane or the like may be adopted.
  • the membrane separation device 100 here evaluates the cleaning effect of the flat membrane 20, and accordingly, the treated water flowing through the line L1 is supplied to the tank 1 so that the raw water concentration and the amount of water in the tank 1 are constant.
  • raw water is introduced into the tank 1 through the line L2 indicated by the phantom line, and the separated treated water from the tank 1 is treated at the subsequent stage through the line L3 indicated by the phantom line. To be served.
  • the flat membrane unit 10 has a plurality of flat membranes 20 and bubble guides 30 arranged alternately in the horizontal direction (perpendicular to the paper surface of FIG. 1).
  • the bubble guide 30 is provided between them, and these are held by the frame 5, and the frame 5 is open on the upper side and the lower side.
  • the frame 5 may be closed on both sides (left and right sides in FIG. 1) and front and back sides (vertical direction in FIG. 1).
  • a plurality of flat membranes 20 arranged in parallel are necessary. If it can hold.
  • the water collecting pipe which connected the water collecting port of the flat membrane 20 is provided in the upper part, and this water collecting pipe is connected to the said line L1.
  • the flat membrane of the present embodiment is a membrane formed into a flat shape, and may be used for a normal membrane separation method.
  • Polyolefin resins such as chlorinated polyethylene, polyvinylidene fluoride resins And a porous membrane formed from polytetrafluoroethylene resin, polypropylene, polyethylene, polystyrene, polyacrylonitrile, cellulose acetate, polysulfone, polyethersulfone, ceramic, and the like.
  • the bubble guide 30 is formed in a wave shape (substantially sinusoidal), and is formed of, for example, vinyl chloride, polyethylene, polypropylene, other general-purpose resins, or metals such as iron and stainless steel. Is done.
  • the above-described flat flat membrane 20 and the corrugated bubble guide 30 are alternately arranged in parallel (in the vertical direction in FIG. 1 and in the vertical direction in FIG. 2).
  • a hollow closed cross-section structure 50 extending in the vertical direction is formed thereby, and the closed cross-section structure 50 is perpendicular to the juxtaposition direction (the left-right direction in FIG. 1 and the left-right direction in FIG. 2).
  • a flow path 60 is formed in the closed cross-sectional structure 50.
  • the flat membrane unit 10 includes a plane that is not parallel to the facing flat membrane 20 between the flat membranes 20 and 20 adjacent to each other in the juxtaposition direction (crossing the facing flat membrane 20).
  • a bubble guide 30 in contact with the facing flat membrane 20), and the hollow closed cross-section structure 50 and the flow are formed by the bubble guide 30 and the flat membrane 20 in contact with each other.
  • a plurality of paths 60 are provided.
  • the membrane separation apparatus 100 having such a configuration, in the tank 1, the raw water and the treated water are solid-liquid separated by the flat membrane 20 of the flat membrane unit 10 immersed in the tank 1, and bubbles due to aeration are generated. It flows upward as a flow path 60 in a closed cross-sectional structure 50 composed of the flat membrane 20 and the bubble guide 30. For this reason, as compared to the case where bubbles flow through a wide flow path between flat membranes facing in parallel as in the prior art, the bubbles do not come into contact with the entire membrane surface and the entire surface cannot be washed with a strong force uniformly. Thus, the entire membrane surface is efficiently and uniformly washed with a strong force by the bubbles flowing through the narrow channel 60. As a result, the cleaning power for the membrane surface can be improved, the clogging of the membrane can be reduced, and a stable filtration ability can be obtained for a long time.
  • 3A to 3F are diagrams showing the relationship between the gas ratio of the flow channel 60 and the bubble shape.
  • the cleaning effect was particularly remarkable when the gas ratio was in the range of 0.4 to 0.8. This is because, as shown in FIGS. 3C to 3E, in the flow path 60 in the closed cross-section structure 50, a vertically elongated and bullet-shaped bubble A is generated, and the bubble A is The flat membrane 20 and the bubble guide 30 constituting the closed cross-section structure 50 are lifted in contact so as to be pressed over almost the entire surface, and as the bubble A rises, a slight gap between the bubble A and the membrane surface is formed. It is presumed that a strong shearing force is generated when the raw water moves downward at a high flow rate opposite to the bubbles A.
  • the cleaning power for the membrane surface can be further improved, the clogging of the membrane can be further reduced, and the filtration performance can be stabilized for a long time. Can be obtained.
  • FIG. 4 is a diagram showing a flat membrane unit of a membrane separation apparatus to which a membrane separation method according to another embodiment of the present invention is applied, and is a diagram corresponding to FIG.
  • the flat membrane unit 11 shown in FIG. 4 (a) forms a hollow closed cross-sectional structure by arranging the above-described flat flat membrane 20 and triangular wave-shaped bubble guides 31 alternately in the vertical direction in the figure.
  • the inside of the closed cross-sectional structure is a flow path 61.
  • the flat membrane unit 12 shown in FIG. 4B has a hollow closed cross-section structure by arranging the above-described flat membrane 20 and the sawtooth-shaped bubble guide 32 alternately in the vertical direction in the drawing.
  • the inside of the closed cross-sectional structure is a flow path 62.
  • a flat membrane unit 13 shown in FIG. 4C extends between the flat flat membranes 20 and 20 in a direction perpendicular to the flat membrane 20 and a bubble guide 33 connecting the flat membranes 20 and 20 to each other.
  • a hollow closed cross-section structure is formed by these, and the inside of the closed cross-section structure is used as a flow path 63.
  • a plane that is not parallel to the facing flat membrane is provided between the flat membranes adjacent to each other in the juxtaposed direction, and the flat membranes facing each other are provided. It has a bubble guide in contact with it, and has a hollow closed cross-sectional structure extending in the vertical direction by these face-to-face bubble guide and flat membrane, and a plurality of closed cross-section structures in a direction orthogonal to the juxtaposed direction. Since the closed cross-sectional structure is a flow path through which bubbles are generated by aeration, the same functions and effects are achieved by the same membrane separation method as in the previous embodiment. Further, by setting the gas ratio in the flow path to 0.4 to 0.8, which is the same as in the previous embodiment, the same operation and effect can be obtained.
  • the flat membrane unit 110 is formed by holding a plurality of flat membranes 120 arranged side by side in a horizontal direction (perpendicular to the plane of FIG. 5) by a frame body 105.
  • the frame body 105 has an upper side and a lower side opened. Yes.
  • the frame 105 may be closed or open on both sides (left and right sides in FIG. 5) and on the front and back sides (vertical direction in FIG. 5). If it can hold.
  • the water collecting pipe which connected the water collecting port of the flat membrane 120 is provided in the upper part, and this water collecting pipe is connected to the line L11.
  • the flat membrane of the present embodiment is a membrane formed into a planar shape or a sheet shape, and may be used in a normal membrane separation method.
  • Polyolefin resin such as chlorinated polyethylene, polyfluorinated Examples thereof include a porous film formed from vinylidene resin, polytetrafluoroethylene resin, polypropylene, polyethylene, polystyrene, polyacrylonitrile, cellulose acetate, polysulfone, polyethersulfone, ceramic and the like.
  • the flat film of the present embodiment is constituted by a wave-shaped (substantially sinusoidal) film 120 as shown in FIG.
  • the corrugated membrane 120 and the inverted membrane 120 are alternately arranged in parallel (in the vertical direction in FIG. 5 and in the vertical direction in FIG. 6).
  • a hollow closed cross-section structure 150 extending in the vertical direction is formed, and the closed cross-section structure 150 is perpendicular to the parallel arrangement direction (the left-right direction in FIG. 5 and the left-right direction in FIG. 6).
  • the flow path 160 is formed in the closed cross-sectional structure 150.
  • the flat membranes 120, 120 adjacent to each other in the juxtaposed direction are provided with surfaces that are not parallel to the facing flat membrane 120 (so as to intersect the facing flat membrane 120).
  • the facing membranes 120 and 120 are configured to have a plurality of the hollow closed cross-sectional structure 150 and the flow path 160.
  • the membrane separation apparatus 200 having such a configuration, in the tank 101, the raw water and the treated water are separated into solid and liquid by the film forming the closed cross-sectional structure 150 of the flat membrane unit 110 immersed in the tank 101, and the scattered water is dispersed. Air bubbles flow upward in the closed cross-sectional structure 150 as a flow path 160. For this reason, as compared to the case where bubbles flow through a wide flow path between flat membranes facing in parallel as in the prior art, the bubbles do not come into contact with the entire membrane surface and the entire surface cannot be washed with a strong force uniformly. Thus, the entire membrane surface is efficiently and uniformly washed with a strong force by the bubbles flowing through the narrow channel 160. As a result, the cleaning power for the membrane surface can be improved, the clogging of the membrane can be reduced, and a stable filtration ability can be obtained for a long time.
  • FIGS. 7A to 7F are views showing the relationship between the gas ratio of the flow channel 160 and the bubble shape.
  • the cleaning effect was particularly remarkable when the gas ratio was in the range of 0.4 to 0.8. This is because, as shown in FIGS. 7C to 7E, a vertically elongated bullet-shaped bubble B in a crushed state is formed in the flow channel 160 formed inside the annular film having the closed cross-sectional structure 150. And the bubble B rises in contact so as to be pressed over almost the entire surface of the ring-shaped film having the closed cross-section structure 150. As the bubble B rises, the bubble B rises between the bubble B and the film surface. It is presumed that a strong shearing force is generated by moving a slight gap downward at a high flow velocity in the direction opposite to the bubbles B.
  • the gas ratio of the flow path 160 is set to 0.4 to 0.8 in this way, the cleaning power for the membrane surface can be further improved, the clogging of the membrane can be further reduced, and the filtration performance can be stabilized for a long time. Can be obtained.
  • FIG. 8 is a view showing a flat membrane unit of a membrane separation apparatus to which a membrane separation method according to another embodiment of the present invention is applied, and corresponds to FIG.
  • the planar flat membrane 121 and the corrugated membrane 120 are alternately arranged in parallel (in the vertical direction in the drawing, in the vertical direction in FIG. 5).
  • a hollow closed cross-sectional structure is formed by these, and the inside of the closed cross-sectional structure is a flow path 161.
  • rectangular wave-shaped membranes 122 are arranged side by side in the figure, thereby forming a hollow closed cross-sectional structure, and the inside of the closed cross-sectional structure is used as a flow path 162. Is.
  • the rectangular wave membrane 122 and the inverted membrane 122 are arranged alternately in the vertical direction in the figure, thereby forming a hollow closed cross-sectional structure.
  • the inside of the closed cross-sectional structure is a flow path 163.
  • the flat membrane unit 114 shown in FIG. 8 (d) has a membrane 123 in which the rectangular top portion of the flat membrane unit 112 shown in FIG. A cross-sectional structure is formed, and the inside of the closed cross-sectional structure is a flow path 164.
  • the flat membrane unit 115 shown in FIG. 8 (e) has a hollow closed cross-sectional structure formed by arranging membranes 124 having ⁇ shapes continuous in the longitudinal direction in the vertical direction in the figure, and flows in the closed cross-sectional structure. This is the path 165.
  • the flat membrane unit 116 shown in FIG. 8 (f) has a hollow closed cross-sectional structure formed of a film 125 that forms a structure similar to a honeycomb structure, and the inside of the closed cross-sectional structure serves as a flow path 166.
  • the flat membrane unit 117 shown in FIG. 8 (g) has the above-described flat flat membrane 121 and triangular wave-shaped membrane 126 arranged alternately in the vertical direction in the drawing, thereby forming a hollow closed cross-sectional structure.
  • the inside of the closed cross-sectional structure is a flow path 167.
  • FIG. 9 is a diagram showing a flat membrane and a flat membrane unit according to a modified example, and the flat membrane and the flat membrane unit shown in FIG. 9 can be adopted instead of the above-described flat membrane and the flat membrane unit. .
  • the flat film 221 shown in FIG. 9A is bent and curved in a plan view.
  • the flat film 231 shown in FIG. 9B is bent so as to form a predetermined angle.
  • the flat film 241 shown in FIG. 9C is bent in a spiral shape. In this way, it is possible to employ flat films having various shapes.
  • the flat membrane unit 311 shown in FIG. 9D is a unit in which membranes 321 are arranged in the tank 301 so as not to be parallel to each other.
  • a flat membrane unit 411 shown in FIG. 9E is obtained by adding a round pleat 421 and a square pleat 431 to a flat membrane 401.
  • the above pleats may be attached to the whole film surface, or may be attached only to a part of the film surface.
  • the flat membranes adjacent to each other in the juxtaposed direction have surfaces that are not parallel to the opposing flat membranes.
  • the facing membranes By contacting the flat membranes facing each other, the facing membranes have a hollow closed cross-sectional structure extending in the vertical direction, and the closed cross-sectional structure is perpendicular to the juxtaposed direction. Since there are a plurality of closed cross-sectional structures in which closed air bubbles flow, the same action and effect are obtained by the same membrane separation method as in the previous embodiment. Further, by setting the gas ratio in the flow path to 0.4 to 0.8, which is the same as in the previous embodiment, the same operation and effect can be obtained.
  • the present invention has been specifically described based on the embodiment, the present invention is not limited to the above embodiment.
  • the flat membrane units 10 to 13 are installed in the tank 1.
  • immersion type integrated type
  • immersion type separation tank type
  • membrane separation in which raw water containing treated water treated in the reaction tank is introduced into the subsequent membrane separation tank, and the membrane surface is washed and solid-liquid separated exclusively by aeration. Is also applicable.
  • the membrane separation method includes immersing a flat membrane unit in which a plurality of flat membranes are juxtaposed in a horizontal direction in a tank containing raw water, and performing aeration with gas, Is a membrane separation method in which the raw water and the treated water are separated into solid and liquid at the same time.
  • the facing membranes By contacting the facing flat membranes, the facing membranes have a hollow closed cross-sectional structure extending in the vertical direction, and a plurality of the closed cross-sectional structures are arranged in a direction perpendicular to the juxtaposed direction. It is characterized in that it is immersed in a tank, solid-liquid separated into raw water and treated water with a film forming a closed cross-sectional structure, and air bubbles are allowed to flow through the closed cross-sectional structure as a flow path.
  • the membrane separation apparatus is configured to immerse a flat membrane unit in which a plurality of flat membranes are juxtaposed in a horizontal direction in a tank containing raw water, and perform aeration with a gas.
  • a membrane separation device that separates solid and liquid into raw water and treated water at the same time
  • the flat membrane unit has a plane in which the flat membranes adjacent in the juxtaposition direction are not parallel to the facing flat membrane.
  • the facing membranes By contacting the facing flat membranes, the facing membranes have a hollow closed cross-sectional structure extending in the vertical direction, and a plurality of the closed cross-sectional structures are arranged in a direction perpendicular to the juxtaposed direction. And the inside of the closed cross-sectional structure is a flow path through which bubbles due to aeration flow.
  • a hollow closed cross-sectional structure extending in the vertical direction and arranged in a direction orthogonal to the juxtaposed direction is formed by facing membranes.
  • Raw water and treated water are separated into solid and liquid by the membrane to be formed, and bubbles due to aeration flow through the closed cross-sectional structure as flow channels, so a wide flow channel between flat membranes facing in parallel as in the prior art.
  • the entire membrane surface is efficiently and uniformly cleaned with bubbles flowing through a narrow channel.
  • the detergency on the membrane surface can be improved, clogging of the membrane can be reduced, and a stable filtration ability can be obtained for a long time.
  • the ratio of the gas in the flow path may be 0.4 to 0.8.
  • a vertically elongated bullet-like bubble is generated in a flow path formed inside a film having an annular shape with a closed cross-sectional structure, and the bubble is closed-structured.
  • the bubble rises, a slight gap between the bubble and the membrane surface is caused to flow downward so that the raw water is opposite to the bubble.
  • strong shearing force is generated, which can further improve the cleaning power on the membrane surface, further reduce clogging of the membrane, and obtain a stable filtration ability for a longer time. it can.
  • the present invention can be used in a membrane separation method and a membrane separation apparatus that perform solid-liquid separation of raw water and treated water using a flat membrane.

Abstract

Dans la présente invention, des membranes (20, 20) sont disposées en rangées et des guides de bulle (30) sont disposés entre les membranes plates adjacentes, et les membranes plates (20) et les guides de bulle (30) tournés vers les membranes (20) forment une pluralité de structures en coupe fermées, creuses (50) qui s'étendent dans la direction de haut en bas et s'alignent dans la direction orthogonale à la direction de la disposition des rangées. Des bulles créées par l'air diffusé sont forcées à s'écouler dans des canaux d'écoulement (60) formés à l'intérieur des structures en coupe fermées (50) comprenant les membranes plates (20) et les guides de bulle (30). Dans l'état de la technique conventionnelle, les bulles sont forcées à s'écouler dans des canaux d'écoulement larges entre des membranes plates se faisant face dans la direction parallèle, et en raison du fait que les bulles ne viennent pas en contact avec toute la surface des membranes, toute la surface ne peut pas être nettoyée de manière uniforme avec une force puissante. Par comparaison avec l'état de la technique conventionnelle, la présente invention nettoie toute la surface des membranes efficacement et uniformément avec une force puissante en amenant les bulles à s'écouler dans les canaux d'écoulement étroits (60).
PCT/JP2012/082678 2012-01-05 2012-12-17 Procédé de séparation sur membrane et appareil de séparation sur membrane WO2013103083A1 (fr)

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Application Number Priority Date Filing Date Title
CN201280062646.1A CN104010716B (zh) 2012-01-05 2012-12-17 膜分离方法及膜分离装置

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JP2012-000594 2012-01-05
JP2012000593 2012-01-05
JP2012-000593 2012-01-05
JP2012000594 2012-01-05

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US9333464B1 (en) 2014-10-22 2016-05-10 Koch Membrane Systems, Inc. Membrane module system with bundle enclosures and pulsed aeration and method of operation
USD779632S1 (en) 2015-08-10 2017-02-21 Koch Membrane Systems, Inc. Bundle body

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Publication number Priority date Publication date Assignee Title
CN111229042B (zh) * 2020-01-17 2021-11-09 哈尔滨工业大学 一种防污抗堵微鳞超滤膜装置

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