WO2016158308A1 - Tube diffuseur et unité de filtration - Google Patents

Tube diffuseur et unité de filtration Download PDF

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Publication number
WO2016158308A1
WO2016158308A1 PCT/JP2016/057698 JP2016057698W WO2016158308A1 WO 2016158308 A1 WO2016158308 A1 WO 2016158308A1 JP 2016057698 W JP2016057698 W JP 2016057698W WO 2016158308 A1 WO2016158308 A1 WO 2016158308A1
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WO
WIPO (PCT)
Prior art keywords
solid content
air diffuser
air
diffuser
hollow fiber
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PCT/JP2016/057698
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English (en)
Japanese (ja)
Inventor
育 田中
博子 三木
知行 米田
森田　徹
Original Assignee
住友電気工業株式会社
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Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to JP2016540068A priority Critical patent/JPWO2016158308A1/ja
Publication of WO2016158308A1 publication Critical patent/WO2016158308A1/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
    • B01D63/02—Hollow fibre 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
    • 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 an air diffuser and a filtration unit.
  • a filtration unit having a filtration module in which a plurality of hollow fiber membranes are converged is used as a solid-liquid separation treatment apparatus in a manufacturing process of sewage treatment or medicine.
  • Such a filtration unit is used by being immersed in the liquid to be treated, and prevents the suspended substance contained in the liquid to be treated from being permeated by the surface of the hollow fiber membrane, and allows other substances other than the suspended substance to permeate inside. Filtration is performed at
  • a configuration is adopted in which gas is introduced between a plurality of hollow fiber membranes constituting the filtration module, and suspended substances adhering to the surface of the hollow fiber membranes are removed by this gas.
  • a filtration unit having such a configuration for example, “a filtration module and a filtration apparatus using the same” (see Japanese Patent Application Laid-Open No. 2009-154032) has been proposed.
  • the filtration unit described in the above publication has an air diffuser for releasing gas between a plurality of hollow fiber membranes constituting the filtration module.
  • the air diffuser has a plurality of gas discharge ports, and the gas released from the gas discharge ports rubs the surface of the hollow fiber membrane and further suspends by swinging the hollow fiber membrane. Material can be removed.
  • the air diffuser as described above can wash the hollow fiber membrane by releasing the gas from the gas discharge port, there is a possibility that solids such as suspended substances may enter the inside from the gas discharge port. Furthermore, the solid content that has entered the inside may stay inside, and the inside of the air diffuser may become dirty or the gas in the air diffuser may deteriorate.
  • the present invention has been made based on the above-described circumstances, and an object thereof is to provide an air diffuser that can prevent solids from staying inside and a filtration unit having the air diffuser.
  • An air diffuser according to an aspect of the present invention made to solve the above problems includes an air diffuser disposed on an upper side and a solid content discharge opening disposed on a lower side.
  • a filtration unit made to solve the above problems includes a filtration module having a plurality of hollow fiber membranes, and a gas supply module that supplies bubbles from below the filtration module. It is a filtration unit, Comprising: The said gas supply module has a gas pumping apparatus and the said diffuser pipe by which one end is connected to this gas pumping apparatus.
  • the diffuser of the present invention can prevent the solid content from staying inside. Moreover, since the filtration unit of the present invention can prevent solid content from staying in the diffuser tube, it is excellent in the cleaning efficiency of the hollow fiber membrane.
  • FIG. 2 is a cross-sectional view of the air diffuser of FIG. 1 taken along line AA. It is a typical side view which shows the diffuser which concerns on embodiment different from the diffuser of FIG. It is a typical side view which shows the diffuser tube which concerns on embodiment different from the diffuser tube of FIG.
  • FIG. 6 is a cross-sectional view of the diffuser tube of FIG. 5 taken along the line BB. It is a mimetic diagram showing a filtration unit concerning one embodiment of the present invention.
  • FIG. 11 is a cross-sectional view of the diffuser tube of FIG. 10 taken along the line DD. It is a typical side view which shows the diffuser tube which concerns on embodiment different from the diffuser tube of FIG.
  • the air diffuser includes an air diffuser disposed on the upper side and a solid content discharge opening disposed on the lower side.
  • the diffuser tube is used in a state where it is immersed in the liquid to be treated, for example, below a filtration module having a plurality of hollow fiber membranes. For this reason, when a gas is introduced from one end of the diffuser tube in the axial direction, the gas flows between the upper inner wall of the diffuser tube and the liquid to be processed. As a result, an air layer composed of gas and a liquid layer located below the air layer are formed inside the air diffuser.
  • the said air diffusion pipe is provided with the air diffusion hole arrange
  • the said diffuser tube is provided with the solid content discharge
  • a plurality of the above-mentioned air diffusion holes are arranged in a scattered manner in the axial direction.
  • the plurality of air diffusion holes are arranged in the axial direction so that the air diffusion pipe can efficiently discharge the gas along the axial direction.
  • the said diffuser tube is easy to maintain an air layer and a liquid layer stably in an diffuser tube.
  • the center of the air diffuser be disposed so as to substantially coincide with a vertical plane passing through the central axis.
  • the air diffuser discharges gas easily and reliably from the air layer formed in the tube. be able to.
  • the center of the solid content discharge opening is disposed so as to substantially coincide with a vertical plane passing through the central axis.
  • the air diffuser can easily and reliably discharge the solid content.
  • the solid content discharge opening may be formed in a slit shape parallel to the central axis.
  • emission opening is formed in the slit shape parallel to a center axis
  • tube can discharge
  • the air diffusion hole and the solid content discharge opening are arranged so as to face each other with respect to a horizontal plane passing through the central axis.
  • the air diffuser hole and the solid content discharge opening are arranged so as to face each other with reference to a horizontal plane passing through the central axis.
  • the air diffusion holes and the solid content discharge openings are alternately arranged in the axial direction.
  • the strength of the air diffuser can be increased by alternately disposing the air diffuser holes and the solid content discharge openings in the axial direction.
  • a filtration unit is a filtration unit including a filtration module having a plurality of hollow fiber membranes and a gas supply module that supplies bubbles from below the filtration module, wherein the gas supply module is And a gas pumping device, and the air diffuser pipe having one end connected to the gas pumping device.
  • the filtration unit Since the filtration unit has the air diffusing tube, it is possible to prevent the solid content from staying inside the air diffusing tube and to efficiently clean the filtration module.
  • upper side and lower side mean an upper side and a lower side based on a horizontal plane passing through the central axis. That is, “upper side” and “lower side” do not mean only a vertical plane passing through the central axis.
  • the center of the air diffuser substantially coincides with the vertical plane passing through the central axis means that the angle between the straight line passing through the center of the air diffuser and the central axis of the air diffuser and the vertical plane passing through the central axis is ⁇ It means 10 ° or less, preferably ⁇ 5 ° or less.
  • the center of the solid content discharge opening substantially coincides with the vertical plane passing through the central axis means that the straight line passing through the center of the solid content discharge opening and intersecting the central axis of the air diffuser and the vertical plane passing through the central axis. It means that the formed angle is ⁇ 10 ° or less, preferably ⁇ 5 ° or less.
  • Air diffuser> 1 is disposed below a filtration module having a plurality of hollow fiber membranes, and cleans the filtration module with discharged gas.
  • the air diffuser 1 is used in a state where it is immersed in the liquid to be treated.
  • the air diffuser 1 is disposed so that the central axis is in the horizontal direction.
  • the diffuser tube 1 is formed in a straight tube shape.
  • the shape of the cross section in the axial direction of the air diffusing tube 1 is circular.
  • the air diffusion tube 1 includes a plurality of air diffusion holes 2 disposed on the upper side and scattered in the axial direction, and a plurality of solid content discharge openings 3 disposed on the lower side.
  • the air diffuser 1 cleans the filtration module by discharging the gas introduced inside from one end in the axial direction upward from the plurality of air diffusers 2 while sending the gas to the other end.
  • the main components of the air diffuser 1 include metals such as stainless steel, steel, copper, and aluminum, and synthetic resins such as acrylic resin, polyethylene, polyvinyl chloride, and acrylonitrile-butadiene-styrene copolymer (ABS resin). Of these, polyvinyl chloride is preferable because of its excellent durability and relatively low cost.
  • the gas diffusion tube 1 is formed with a gas layer X and a liquid layer (liquid layer to be processed) Y by introducing a gas from one end in the axial direction. That is, since the air diffuser 1 is used in a state of being immersed in the liquid to be processed, the liquid to be processed is filled inside before introducing the gas. When gas is introduced from one end side in this state, the specific gravity of the gas is smaller than the specific gravity of the liquid to be processed, so that the gas flows between the upper inner wall of the air diffuser 1 and the liquid to be processed.
  • the inside of the air diffuser 1 is in a laminated state of two layers, that is, a gas layer X composed of gas and a liquid layer Y positioned below the gas layer X.
  • the air diffuser 1 has a plurality of air diffusers 2 arranged in a scattered manner in the axial direction, the gas introduced into the interior by discharging the gas from the air diffusers 2 and the outside It is easy to balance with the gas discharged into the.
  • the diffuser tube 1 can easily maintain the two-layer state of the gas layer X and the liquid layer Y stably.
  • the gas introduced into the air diffuser 1 is required to have a specific gravity smaller than that of the liquid to be treated because it is necessary to form the gas layer X on the upper side of the air diffuser 1.
  • the gas introduced into the air diffuser 1 is preferably an inert gas. Although it does not specifically limit as such gas, Typically, air is mentioned.
  • the lower limit of the inner diameter of the air diffuser 1 is preferably 6 mm, more preferably 10 mm, and even more preferably 15 mm.
  • the upper limit of the inner diameter of the air diffuser 1 is preferably 70 mm, more preferably 60 mm, and even more preferably 50 mm. If the inner diameter of the air diffusing tube 1 is less than the lower limit, the gas layer X and the liquid layer Y may not be accurately formed inside the air diffusing tube 1. On the other hand, when the inner diameter of the air diffusing tube 1 exceeds the above upper limit, the volume in the tube increases, and there is a risk that solids such as suspended substances are likely to stay inside.
  • the liquid to be processed which constitutes the liquid layer Y also flows from one end to the other end side, and the air diffuser 1 is retained in the pipe by the flow of the liquid to be processed.
  • the solid content to be discharged can be discharged.
  • the inner diameter exceeds the upper limit, the ratio of the liquid layer Y in the tube tends to be high, so that the flow of the liquid to be treated based on the introduction of the gas cannot be sufficiently obtained, and as a result, the solid content is efficiently discharged. May decrease.
  • the lower limit of the average tube thickness of the diffuser tube 1 is preferably 1 mm, and more preferably 2 mm.
  • the upper limit of the average tube thickness of the diffusing tube 1 is preferably 6 mm, and more preferably 4 mm. If the average tube thickness of the air diffuser 1 is less than the lower limit, sufficient strength may not be obtained. Conversely, if the average tube thickness of the air diffuser 1 exceeds the upper limit, the outer diameter may be unnecessarily increased.
  • the plurality of air diffusion holes 2 are formed in a circular shape. As shown in FIG. 1, the plurality of air diffusion holes 2 are arranged at equal intervals in the axial direction of the air diffusion tube 1.
  • the air diffuser 1 has a plurality of air diffuser holes 2 arranged at equal intervals in the axial direction, and discharges gas introduced from one end to the other end side while discharging substantially uniformly along the axial direction. Can do.
  • the plurality of diffuser holes 2 can be formed by laser processing, for example.
  • the centers of the plurality of air diffusion holes 2 are arranged so as to substantially coincide with a vertical plane passing through the central axis of the air diffusion tube 1. That is, the centers of the plurality of air diffusion holes 2 are included in a vertical plane passing through the central axis of the air diffusion tube 1.
  • the air diffuser 1 is arranged so that the center of the plurality of air diffusers 2 substantially coincides with a vertical plane passing through the central axis, thereby easily and reliably discharging gas from the air layer X formed in the tube. Can do.
  • the diffuser holes 2 and the solid content discharge openings 3 are arranged so as to face each other on the basis of a horizontal plane passing through the central axis of the diffuser pipe 1.
  • the air diffuser 1 is easily discharged from the solid content discharge opening 3 facing the air diffuser 2 without being retained in the tube.
  • the centers of the plurality of air diffusion holes 2 coincide with the uppermost part of the peripheral wall of the air diffusion tube 1 and the centers of the plurality of solid content discharge openings 3 coincide with the lowermost part of the peripheral wall. It is arranged. Therefore, the air diffuser 1 can further reduce the possibility that the solid content stays inside.
  • the average diameter D 1 of the plurality of air diffusion holes 2 is smaller than the average diameter D 2 of the plurality of solid content discharge openings 3.
  • the diameter of several diffuser holes 2 may each differ, it is preferable that it is the same from the point which discharges gas equally.
  • the lower limit of the average diameter D 1 of the plurality of diffusing pores 2, 1 mm are preferred, 2 mm is more preferable.
  • the upper limit of the mean diameter D 1 of the plurality of diffusing pores 2, 10 mm are preferred, 8 mm is more preferable.
  • the average diameter D 1 is less than the above lower limit, diffusing pores 2 may not be sufficiently discharged gas.
  • the average diameter D 1 exceeds the upper limit, by gas discharge amount is too large from the diffusing pores 2, the gas is disposed at one end when the gas is introduced from one end There is a possibility that the discharge amount from the other end side cannot be sufficiently obtained due to excessive discharge from the air diffusion hole 2.
  • the plurality of solid content discharge openings 3 are composed of a plurality of holes provided in the air diffusion tube 1.
  • the plurality of solid content discharge openings 3 are formed in a circular shape. As shown in FIG. 1, the plurality of solid content discharge openings 3 are arranged at equal intervals in the axial direction of the air diffusion tube 1.
  • the air diffuser 1 can easily and reliably discharge the solid content retained in the pipe by disposing the plurality of solid content discharge openings 3 at equal intervals in the axial direction.
  • the plurality of solid content discharge openings 3 can be formed by, for example, laser processing.
  • the air diffuser 1 is disposed so that the air diffuser 2 and the solid content discharge opening 3 are opposed to each other with reference to a horizontal plane passing through the central axis.
  • the average pitch is the same as the average pitch P 1 of the plurality of air diffusion holes 2.
  • the centers of the plurality of solid content discharge openings 3 are arranged so as to substantially coincide with a vertical plane passing through the central axis of the air diffuser 1.
  • the diffuser tube 1 is disposed so that the centers of the plurality of solid content discharge openings 3 substantially coincide with the vertical plane passing through the central axis, so that the solid content can be easily and reliably removed from the liquid layer Y formed in the tube. Can be discharged.
  • the lower limit of the average diameter D 2 of the plurality of solids discharge openings 3, 2 mm are preferred, 3 mm is more preferable.
  • the upper limit of the mean diameter D 2 of the plurality of solids discharge openings 3, 25 mm is preferable, 20 mm is more preferable.
  • the average diameter D 2 is smaller than the above lower limit, the solids discharge opening 3, it may not be properly discharged solids.
  • the average diameter D 2 exceeds the upper limit, the strength of the diffuser tube 1 may decrease.
  • release opening 3 may each differ, it is preferable that it is the same from the point which discharges
  • the lower limit of the ratio (D 2 / D 1 ) of the average diameter D 2 of the plurality of solid content discharge openings 3 to the average diameter D 1 of the plurality of air diffusion holes 2 is preferably 11/10, and more preferably 6/5.
  • the upper limit of the ratio (D 2 / D 1 ) is preferably 5/2, and more preferably 3/2. If the ratio (D 2 / D 1 ) is less than the lower limit, the diameter of the solid content discharge opening 3 becomes too small, and the solid content may not be accurately discharged from the solid content discharge opening 3.
  • the air diffuser 1 and the solid content discharge opening 3 are arranged so as to face each other with respect to a horizontal plane passing through the central axis of the air diffuser 1, the air diffuser 1 is connected from the air diffuser 2 to the inside. There is a possibility that it is difficult to discharge the solid content that has entered into the tube from the solid content discharge opening 3 without being retained in the pipe. On the other hand, if the ratio (D 2 / D 1 ) exceeds the upper limit, the diameter of the solid content discharge opening 3 becomes too large, and the strength of the diffuser tube 1 may be reduced.
  • the air diffusion tube 1 includes a plurality of air diffusion holes 2 disposed on the upper side and scattered in the axial direction, and therefore, the plurality of air diffusion holes 2 are sent while sending the gas introduced from one end in the axial direction to the other end side. It is possible to efficiently discharge from above. Thereby, the said air diffusing tube 1 can wash
  • the air diffuser 1 since the air diffuser 1 includes a plurality of solid content discharge openings 3 disposed on the lower side, the solid content such as suspended solids can be discharged from the solid content discharge openings 3.
  • the diffuser tube 1 is provided with a plurality of solid content discharge openings 3 disposed on the lower side, so that the solid content present in the tube is pushed to the other end side by the flow of the liquid to be treated, and the solid content It can be discharged from the discharge opening 3 to the outside. Therefore, the diffuser tube 1 can easily prevent the solid content from staying inside.
  • the diffuser tube 1 has a plurality of solid content discharge openings 3 formed of a plurality of holes, so that a peripheral wall exists in a lower portion where the solid content discharge openings 3 do not exist. Therefore, the air diffuser 1 is easy to form the gas layer X and the liquid layer Y in the tube, and the gas is less likely to leak from below. Therefore, the air diffuser 1 can accurately discharge gas from the plurality of air diffusers 2.
  • the diffuser tube 11 of FIG. 4 is used in place of the diffuser tube 1 of FIG. 4 .
  • the air diffuser 11 in FIG. 4 includes a plurality of air diffuser holes 12 disposed on the upper side and scattered in the axial direction, and a plurality of solid content discharge openings 13 disposed on the lower side.
  • the diffuser tube 11 of FIG. 4 is configured in the same manner as the diffuser tube 1 of FIG. 1 except for the arrangement of the plurality of diffuser holes 12 and the plurality of solid content discharge openings 13. Therefore, only the positional relationship between the plurality of air diffusion holes 12 and the plurality of solid content discharge openings 13 will be described below.
  • the diffuser holes 12 and the solid content discharge openings 13 are alternately arranged in the axial direction of the diffuser tube 11.
  • the diffuser tube 11 can be increased in strength by disposing the diffuser holes 12 and the solid content discharge openings 13 alternately in the axial direction.
  • the average pitch P of the air diffuser holes 12 and the solid content discharge openings 13 adjacent in the axial direction of the air diffuser 11 is not particularly limited, but is preferably equidistant. Moreover, it is preferable that there is no portion where the air diffusion holes 12 and the solid content discharge openings 13 overlap in the axial direction of the air diffusion tube 11.
  • the diffuser tube 21 in FIG. 5 is used in place of the diffuser tubes 1 and 11 in FIGS.
  • the air diffuser 21 shown in FIG. 5 includes a plurality of air diffusers 2 disposed in a scattered manner in the upper side and in the axial direction, and one solid content discharge opening 23 disposed on the lower side.
  • the air diffuser 21 in FIG. 5 is configured in the same manner as the air diffuser 1 in FIG. 1 except for the shape of the solid content discharge opening 23. Therefore, only the solid content discharge opening 23 will be described below.
  • the solid content discharge opening 23 is formed in a slit shape parallel to the central axis of the air diffuser 21.
  • the solid content discharge opening 23 is formed from one end to the other end of the air diffusion tube 21 in the axial direction.
  • the air diffuser 21 is formed in a substantially C shape having a cross section perpendicular to the axial direction and having an opening downward from one end to the other end.
  • the lower limit of the average width W of the solid content discharge opening 23 is preferably 2 mm, and more preferably 3 mm.
  • the upper limit of the average width W of the solid content discharge opening 23 is preferably 25 mm, and more preferably 20 mm. If the average width W is less than the lower limit, there is a high possibility that the solid content stays in the tube. Conversely, if the average width W exceeds the upper limit, the strength of the air diffuser 21 may be reduced.
  • the lower limit of the ratio of the average width W of the solid content discharge opening 23 to the entire circumference of the air diffuser 21 is preferably 1/20, and more preferably 1/15.
  • the upper limit of the ratio is preferably 1/5, and more preferably 1/10. If the ratio is less than the lower limit, the solid content is likely to stay in the tube. Conversely, if the ratio exceeds the upper limit, the strength of the air diffuser 21 may be reduced.
  • the air diffuser 21 can easily and reliably discharge the solid content.
  • the solid content discharge opening 23 is formed from one end to the other end of the air diffuser 21, it is possible to remarkably reduce the possibility of the solid content remaining in the pipe itself.
  • the filtration unit 31 of FIG. 7 includes a plurality of filtration modules 32 and a gas supply module 33 that supplies bubbles from below the filtration modules 32.
  • the filtration module 32 includes a plurality of hollow fiber membranes 34, an upper holding member 35 that holds the upper ends of the plurality of hollow fiber membranes 34, and a lower holding member 36 that holds the lower ends of the plurality of hollow fiber membranes 34. And have.
  • the plurality of hollow fiber membranes 34 are aligned in the vertical direction, and the existence region in a plan view is rectangular.
  • the upper holding member 35 and the lower holding member 36 are each formed in a rectangular shape in plan view.
  • the plurality of hollow fiber membranes 34 are connected to substantially the entire lower surface of the upper holding member 35 and the upper surface of the lower holding member 36. Thereby, the filtration module 32 has a plane in which the short side direction (left-right direction in FIG.
  • the “existing region” means a virtual polygon having the smallest area among the virtual polygons including all the hollow fiber membranes 34 included in the filtration module 32 when viewed from the axial direction.
  • the plurality of filtration modules 32 are arranged in a stripe shape. Specifically, the plurality of filtration modules 32 are arranged such that adjacent filtration modules 32 are aligned at a predetermined interval in the thickness direction.
  • the lower limit of the average interval in the thickness direction of the plurality of filtration modules 32 is preferably 10 mm, and more preferably 15 mm.
  • the upper limit of the average interval in the thickness direction of the plurality of filtration modules 32 is preferably 30 mm, and more preferably 25 mm. If the average interval is less than the lower limit, it may be difficult to accurately introduce gas discharged from the diffuser 1 described later between the filtration modules 32. On the other hand, when the average interval exceeds the upper limit, the existence density of the filtration module 32 may be reduced and the filtration efficiency may be reduced.
  • the “average interval in the thickness direction of the filtration module” refers to the average interval in the short side direction between the existing regions.
  • the hollow fiber membrane 34 is formed by forming a porous membrane into a tubular shape that allows water to permeate while blocking the permeation of suspended substances contained in the liquid to be treated.
  • thermoplastic resin examples include polyethylene, polypropylene, polyvinylidene fluoride, ethylene-vinyl alcohol copolymer, polyamide, polyimide, polyetherimide, polystyrene, polysulfone, polyvinyl alcohol, polyphenylene ether, polyphenylene sulfide, cellulose acetate, and polyacrylonitrile.
  • PTFE polytetrafluoroethylene
  • PTFE which is excellent in chemical resistance, heat resistance, weather resistance, nonflammability and the like and is porous is preferable, and uniaxially or biaxially stretched PTFE is more preferable.
  • other polymers, additives, such as a lubricant, etc. may be mix
  • the lower limit of the average length L 1 of the short side direction of the existing area 15 mm is preferable, 25 mm is more preferable.
  • the average length L 1 is less than the above lower limit, there is a possibility that sufficient filtration efficiency.
  • the average length L 1 is more than the upper limit, it may be impossible to accurately supply the gas to be discharged from the diffuser tube 1 to the center of the bundle of hollow fiber membranes 34.
  • the average pitch in the long side direction of the hollow fiber membrane 34 is preferably larger than the average pitch in the short side direction.
  • the lower limit of the ratio of the average pitch in the short side direction to the average pitch in the long side direction of the hollow fiber membrane 34 is preferably 2/5, and more preferably 1/2.
  • the upper limit of the ratio of the average pitch in the short side direction to the average pitch in the long side direction of the hollow fiber membrane 34 is preferably 4/5, and more preferably 2/3. If the ratio is less than the above lower limit, the density of the hollow fiber membrane 34 in the long side direction becomes small, and sufficient filtration efficiency may not be obtained. Conversely, if the ratio exceeds the upper limit, the gas discharged from the air diffuser 1 may not be sufficiently introduced between the hollow fiber membranes 34 from one end side in the short side direction.
  • the lower limit of the number (arrangement number) of the hollow fiber membranes 34 arranged in the short side direction in the existence region is preferably 8, and more preferably 12.
  • the upper limit of the number of hollow fiber membranes 34 arranged in the short side direction is preferably 50, more preferably 40. If the number of the hollow fiber membranes 34 arranged in the short side direction is less than the lower limit, the filtration efficiency per unit area may not be sufficiently secured. Conversely, if the number of hollow fiber membranes 34 arranged in the short side direction exceeds the upper limit, the gas discharged from the air diffuser 1 may not be accurately supplied to the center of the bundle of hollow fiber membranes 34. .
  • the lower limit of the ratio of the average pitch in the short side direction to the average outer diameter of the hollow fiber membrane 34 is preferably 1.
  • the upper limit of the ratio of the average pitch in the short side direction to the average outer diameter of the hollow fiber membrane 34 is preferably 3/2, and more preferably 7/5. If the ratio of the average pitch in the short side direction with respect to the average outer diameter of the hollow fiber membrane 34 is less than the lower limit, the hollow fiber membrane 34 is disposed in a state of being crushed in the radial direction. May be difficult to manufacture. On the contrary, when the ratio of the average pitch in the short side direction to the average outer diameter of the hollow fiber membrane 34 exceeds the upper limit, the density of the hollow fiber membrane 34 in the short side direction becomes small, thereby obtaining sufficient filtration efficiency. There is a risk of not being able to.
  • the lower limit of the average outer diameter of the hollow fiber membrane 34 is preferably 1 mm, more preferably 1.5 mm, and even more preferably 2 mm.
  • the upper limit of the average outer diameter of the hollow fiber membrane 34 is preferably 6 mm, more preferably 5 mm, and even more preferably 4 mm. If the average outer diameter of the hollow fiber membrane 34 is less than the lower limit, the mechanical strength of the hollow fiber membrane 34 may be insufficient. On the other hand, when the average outer diameter of the hollow fiber membrane 34 exceeds the above upper limit, the hollow fiber membrane 34 becomes insufficient in flexibility, and vibration and peristalsis of the hollow fiber membrane 34 due to gas contact become insufficient.
  • the gap between the hollow fiber membranes 34 may not be widened to guide the gas to the center of the bundle of hollow fiber membranes 34, and the ratio of the surface area to the cross-sectional area of the hollow fiber membranes 34 is reduced, resulting in a filtration efficiency. May decrease.
  • the lower limit of the average inner diameter of the hollow fiber membrane 34 is preferably 0.3 mm, more preferably 0.5 mm, and even more preferably 0.9 mm.
  • the upper limit of the average inner diameter of the hollow fiber membrane 34 is preferably 4 mm, and more preferably 3 mm. If the average inner diameter of the hollow fiber membrane 34 is less than the above lower limit, the pressure loss when the filtered liquid in the hollow fiber membrane 34 is discharged may increase. On the contrary, if the average inner diameter of the hollow fiber membrane 34 exceeds the above upper limit, the thickness of the hollow fiber membrane 34 may be reduced, and the mechanical strength and the suspended matter permeation preventing effect may be insufficient.
  • the lower limit of the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 34 is preferably 3/10, and more preferably 2/5.
  • the upper limit of the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 34 is preferably 4/5, and more preferably 3/5. If the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 34 is less than the above lower limit, the thickness of the hollow fiber membrane 34 is unnecessarily large and the water permeability of the hollow fiber membrane 34 may be reduced.
  • the ratio of the average inner diameter to the average outer diameter of the hollow fiber membrane 34 exceeds the above upper limit, the thickness of the hollow fiber membrane 34 is reduced, and the mechanical strength and the suspended matter permeation preventing effect may be insufficient. There is.
  • the lower limit of the average effective length L 2 of the hollow fiber membrane 34, 1 m are preferred, 2m is more preferable.
  • the upper limit of the average effective length L 2 of the hollow fiber membrane 34, 6 m are preferred, 5m is more preferable. If the average effective length L 2 of the hollow fiber membrane 34 is less than the above lower limit, swinging of the hollow fiber membranes 34 by abrasion of the gas becomes insufficient, the hollow fiber membrane hollow fiber gas by expanding the gap between 34 film 34 There is a possibility that it cannot be guided to the center of the bundle.
  • the “average effective length of the hollow fiber membrane” refers to the axial length of the portion disposed between the lower end of the upper holding member 35 and the upper end of the lower holding member 36.
  • the lower limit of the tensile strength of the hollow fiber membrane 34 is preferably 50N, and more preferably 60N. If the tensile strength of the hollow fiber membrane 34 is less than the lower limit, the durability against surface cleaning with gas may be reduced.
  • the upper limit of the tensile strength of the hollow fiber membrane 34 is generally 150N.
  • the tensile strength means the maximum tensile stress when a tensile test is conducted at a distance between marked lines of 100 mm and a test speed of 100 mm / min in accordance with JIS-K7161 (1994). *
  • the hollow fiber membrane 34 preferably has a multilayer structure having a support layer disposed on the inner surface side and a filtration layer laminated on the outer surface side of the support layer.
  • the material for forming the support layer and the filtration layer is preferably composed mainly of polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the main component of the material for forming the support layer and the filtration layer is PTFE, so that the hollow fiber membrane 34 has excellent mechanical strength and is not easily damaged by gas scrubbing.
  • the filtration layer can be formed by, for example, winding a PTFE sheet around the support layer and sintering it.
  • the upper holding member 35 is a member that holds the upper ends of the plurality of hollow fiber membranes 34 and communicates with the lumens of the plurality of hollow fiber membranes 34 to collect the filtered liquid (water collection header).
  • a discharge pipe 37 is connected to the discharge portion, and the filtered liquid that has permeated into the plurality of hollow fiber membranes 34 is discharged.
  • the lower holding member 36 is a member that holds the lower ends of the plurality of hollow fiber membranes 34.
  • the lower holding member 36 may have a configuration similar to that of the upper holding member 35, or may have a configuration that does not have a discharge portion that seals the lower end portion of the hollow fiber membrane 34.
  • the lower holding member 36 may be configured such that one hollow fiber membrane 34 is bent in a U shape and folded. In this case, the upper holding member 35 holds both ends of the hollow fiber membrane 34.
  • the upper holding member 35 and the lower holding member 36 may be connected by a connecting member.
  • the connecting member include a metal support rod and a resin casing (outer cylinder).
  • the gas supply module 33 includes a gas pumping device 38 and an air diffuser 1 having one end connected to the gas pumping device 38.
  • the air diffuser 1 is disposed such that the axial direction is parallel to the thickness direction of the plurality of filtration modules 32 (the left-right direction in FIG. 7).
  • the some diffuser 1 is arrange
  • the gas pressure feeding device 38 is not particularly limited, and examples thereof include known blowers and compressors. Further, the air diffuser 1 and the gas pressure feeding device 38 may be connected through an air supply pipe (not shown), for example.
  • the filtration unit 31 has the air diffuser 1, the solid content can be prevented from staying inside the air diffuser and the filtration module 32 can be cleaned efficiently.
  • the center of the plurality of air diffusion holes may not necessarily be substantially the same as the vertical plane passing through the central axis of the air diffusion tube.
  • Examples of the configuration in which the centers of the plurality of air diffusion holes are not substantially the same as the vertical plane passing through the central axis of the air diffusion tube include the air diffusion tubes 51 and 61 described in FIGS.
  • the air diffusion pipe 51 has a plurality of air diffusion holes 52 arranged on the left and right sides in a cross section perpendicular to the axial direction. Even with this configuration, the air diffuser 51 can discharge the gas upward from the plurality of air diffusers 51 and prevent the solid content from staying inside.
  • the plurality of air diffusion holes 52 are preferably arranged at symmetrical positions with respect to a vertical plane passing through the central axis of the air diffusion pipe 51. Thereby, the air diffuser 51 can easily discharge the gas from each air diffuser hole 52 substantially uniformly.
  • the air diffuser 51 is not disposed so that the air diffuser hole and the solid content discharge opening are opposed to each other with respect to a horizontal plane passing through the central axis. However, even with such a configuration, the solid content can be sufficiently discharged. is there.
  • the air diffuser 61 in FIG. 10 includes a plurality of air diffusion holes 62 disposed on the upper side and scattered in the axial direction, and a plurality of solid content discharge openings 63 disposed on the lower side.
  • the air diffuser 61 in FIG. 10 has a quadrangular cross section perpendicular to the axial direction.
  • the air diffuser 61 is provided with a plurality of air diffusers 62 at positions opposed to the upper part of the side wall, and the width of the plurality of solid content discharge openings 63 in the direction perpendicular to the axial direction is the bottom wall. The width is the same. According to this configuration, the air diffuser 61 can accurately discharge the solid content retained on the bottom wall from the plurality of solid content discharge openings 63.
  • the plurality of solid content discharge openings 63 are preferably rectangular.
  • the plurality of solid content discharge openings 53 and 63 may be holes or slits. Also, the diffuser holes 52 and 62 and the solid content discharge openings 53 and 63 do not have to be arranged in the axial direction of the diffuser tubes 51 and 61, and may be alternately arranged in the axial direction. .
  • the diffuser tube does not necessarily have a plurality of diffuser holes. For example, even if the air diffuser has only one air diffuser, the gas can be discharged upward from the air diffuser.
  • the diffuser tube need not necessarily be formed in a straight tube shape.
  • one end of the air diffuser 71 may be curved downward.
  • the air diffuser 71 discharges the gas introduced into the air diffuser 72 from the plurality of air diffuser holes 72, and the suspended substance or the like separated from the plurality of hollow fiber membranes enters from one end side of the air diffuser 71. Can be prevented accurately.
  • an air layer and a liquid layer can be easily and reliably formed in the air diffuser 71.
  • the air diffuser does not necessarily have to be arranged so that the center of the solid content discharge opening substantially coincides with the vertical plane passing through the central axis.
  • the air diffuser may be arranged on the left and right sides in a cross section perpendicular to the axial direction. Good.
  • the solid content discharge opening is disposed at a symmetric position with respect to a vertical plane passing through the central axis of the air diffuser from the viewpoint of increasing the solid content discharge efficiency.
  • the air diffuser is not necessarily circular, and may be, for example, elliptical or polygonal.
  • the average diameter in the case of other than a circle means the average diameter when converted into a perfect circle.
  • the plurality of air diffusion holes are not necessarily arranged at equal intervals. For example, the pitch may be gradually decreased from one end to the other end, conversely, may be increased, or may be random.
  • the average diameter of the air diffusion holes is not necessarily larger than the average diameter of the solid content discharge openings.
  • the average diameter of the air diffusion holes and the average diameter of the solid content discharge openings may be the same.
  • the average diameter of the air diffusion holes may be larger than the average diameter of the solid content discharge opening.
  • the shape of the solid content discharge opening is not necessarily circular, and may be, for example, an ellipse or a polygon.
  • the plurality of solid content discharge openings are not necessarily arranged at equal intervals, for example, the pitch may gradually decrease from one end to the other end, conversely increase or random. Good.
  • the slit does not necessarily need to be formed from one end of the air diffusion tube to the other end. It may be formed only.
  • the solid content discharge opening is formed in a portion other than both end portions in the axial direction, so that the strength can be increased and the connection with other members such as a gas pumping device can be easily performed.
  • the air diffuser does not necessarily need to have only one solid content discharge opening, and slit-shaped solid content discharge openings may be formed in a scattered manner in the axial direction. In this case, it is preferable that the longitudinal direction of the solid content discharge opening is parallel to the axial direction of the air diffuser.
  • the diffuser tube can be used for supplying gas to various water treatment devices and the like in addition to the use for cleaning a filtration module having a plurality of hollow fiber membranes.
  • the gas supply module does not necessarily need to have the air diffuser 1 of the first embodiment, and may have any of the air diffusers 11, 21, 51, 61, 71 described in the present specification, for example.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Accessories For Mixers (AREA)

Abstract

L'invention concerne un tube diffuseur pourvu de trous de diffusion disposés sur le côté supérieur et d'ouvertures d'évacuation de matières solides disposées sur le côté inférieur. La pluralité de trous de diffusion peuvent être disposés de manière discrète le long de la direction axiale. Les centres des trous de diffusion peuvent être disposés de manière à coïncider sensiblement avec un plan vertical passant par l'axe central. Les centres des ouvertures d'évacuation de matières solides peuvent également être disposés de manière à coïncider sensiblement avec un plan vertical passant par l'axe central. Les ouvertures d'évacuation de matières solides peuvent être formées pour avoir des formes de fente parallèles à l'axe central. Les trous de diffusion et les ouvertures d'évacuation de matières solides peuvent être disposés de manière à être en regard les uns des autres autour d'un plan horizontal passant par l'axe central. Les trous de diffusion et les ouvertures d'évacuation de matières solides peuvent être disposés en alternance le long de la direction axiale.
PCT/JP2016/057698 2015-04-02 2016-03-11 Tube diffuseur et unité de filtration WO2016158308A1 (fr)

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JP2015-075901 2015-04-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126349A1 (fr) * 2016-01-22 2017-07-27 住友電気工業株式会社 Tube de diffusion de gaz et unité de filtration
JP2019188351A (ja) * 2018-04-26 2019-10-31 住友電気工業株式会社 散気管及び間欠的気泡発生モジュール

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114564U (fr) * 1975-09-26 1977-08-31
JP2012250169A (ja) * 2011-06-02 2012-12-20 Meidensha Corp 散気装置
JP2014000572A (ja) * 2013-08-26 2014-01-09 Mitsubishi Rayon Co Ltd 散気装置の運転方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114564U (fr) * 1975-09-26 1977-08-31
JP2012250169A (ja) * 2011-06-02 2012-12-20 Meidensha Corp 散気装置
JP2014000572A (ja) * 2013-08-26 2014-01-09 Mitsubishi Rayon Co Ltd 散気装置の運転方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017126349A1 (fr) * 2016-01-22 2017-07-27 住友電気工業株式会社 Tube de diffusion de gaz et unité de filtration
JP2017127844A (ja) * 2016-01-22 2017-07-27 住友電気工業株式会社 散気管及び濾過ユニット
JP2019188351A (ja) * 2018-04-26 2019-10-31 住友電気工業株式会社 散気管及び間欠的気泡発生モジュール

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JPWO2016158308A1 (ja) 2018-01-18

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