WO2013008522A1 - Diffuseur d'air - Google Patents

Diffuseur d'air Download PDF

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Publication number
WO2013008522A1
WO2013008522A1 PCT/JP2012/062146 JP2012062146W WO2013008522A1 WO 2013008522 A1 WO2013008522 A1 WO 2013008522A1 JP 2012062146 W JP2012062146 W JP 2012062146W WO 2013008522 A1 WO2013008522 A1 WO 2013008522A1
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WO
WIPO (PCT)
Prior art keywords
air diffuser
air
diffuser
membrane
section
Prior art date
Application number
PCT/JP2012/062146
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English (en)
Japanese (ja)
Inventor
彰利 中川
寛 野口
泰日 李
Original Assignee
株式会社明電舎
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Filing date
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Publication of WO2013008522A1 publication Critical patent/WO2013008522A1/fr

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    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/18—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/20—Accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
    • 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
    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/26—Specific gas distributors or gas intakes
    • 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 provided in a reaction tank using an immersion type membrane module.
  • a sewage treatment apparatus using a submerged membrane module there is a type in which a plurality of external pressure type solid-liquid separation flat membranes are vertically arranged in a reaction tank.
  • MBR membrane separation activated sludge treatment
  • air bubbles are aerated from an air diffuser installed at the lower part of the reaction tank. This is to supply oxygen to the microorganisms that make up the activated sludge in the reaction tank, and the membrane surface is washed by the water flow generated as the bubbles rise to remove clogging on the membrane surface. It is for suppressing.
  • the diameter of the air diffuser of the air diffuser must be relatively large, 3-10 mm. is there.
  • an air diffuser having a structure in which a plurality of holes of this size are formed in a pipe is used (for example, Patent Document 1).
  • Patent Document 1 In the cleaning of the membrane surface of the membrane module, dirt on the membrane surface is removed by sweeping the membrane surface with a vigorous gas-liquid mixed flow generated by the rise of bubbles due to aeration, and accumulation of dirt is suppressed.
  • the membrane to be used is selected according to the substance to be removed and the target treated water quality.
  • MF membranes and UF membranes are used mainly for the purpose of removing solids, and membranes used in MBR are also usually MF membranes.
  • the material of the film can be roughly classified into an organic film and an inorganic film.
  • MF and UF membranes are PSF (polysulfone), PE (polyethylene), CA (cellulose acetate), PAN (polyacrylonitrile), PP (polypropylene), PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene). Fluoroethylene) is used.
  • NF film and the RO film a polyamide-based organic film is often used.
  • a film using an ceramic MF film, UF film, NF film
  • the shape of the membrane can be classified into a hollow fiber membrane, a flat membrane, a tubular membrane, and a monolith.
  • filtration methods in membrane treatment include total volume filtration (dead-end-filtration) and cross-flow filtration.
  • the cross-flow filtration method always performs filtration while washing the membrane surface with a flow parallel to the membrane surface. This method allows continuous operation in which deposits are removed in parallel with filtration and maintains a high filtration rate. However, in order to create a sufficient parallel flow, the flow rate on the supply water side becomes larger than the filtration flow rate, and filtration is performed. Energy consumption per flow rate increases.
  • the MBR method is a wastewater treatment method that combines membrane filtration with biological treatment by the activated sludge method, but in principle it is necessary to always take measures against clogging (fouling) of the membrane.
  • a preventive method not to deteriorate the membrane filtration performance, it is necessary to always keep the flow velocity at the membrane surface constant by aeration, etc., and there is a problem that the running cost is high because it is necessary to secure the aeration power for that purpose. . Therefore, realization of high flow rate and high-efficiency filtration is required by devising cleaning.
  • the biological reaction tank of the MBR processing apparatus includes, for example, an anoxic tank and an aerobic tank as disclosed in Non-Patent Document 1, and a membrane module is immersed in the aerobic tank.
  • an aeration device for cleaning the membrane module is provided separately from the aeration device for supplying dissolved oxygen, and the air bubbles provided from this aeration device
  • the surface of the membrane is constantly cleaned by Air for air diffusion is supplied to the piping of the air diffuser from a cleaning blower independent of the air diffuser.
  • the inside of the membrane module is in a negative pressure state by a suction pump, and the filtrate in the water collection channel of the membrane module is carried out of the aerobic tank by the suction pump.
  • a certain amount of filtered water is stored in the filtered water tank before being discharged out of the system.
  • the said membrane surface is back-washed with the said filtered water with a fixed period.
  • a cleaning chemical solution is added to the filtered water to remove organic substances on the membrane surface, and periodic chemical cleaning is also performed.
  • a diffuser for cleaning the membrane must be designed and manufactured so that bubbles are uniformly injected into the reaction tank from each diffuser so that the cleaning effect of the highly efficient membrane surface does not vary. .
  • membrane permeation flux membrane flux
  • a portion where the membrane surface is insufficiently washed occurs, so that stable solid-liquid separation treatment is possible. become unable. Therefore, for example, techniques disclosed in Patent Documents 2 to 4 have been proposed as countermeasures against clogging of gas discharge holes in the diffuser.
  • the MBR processing apparatus disclosed in Patent Document 5 improves the cleaning performance of the membrane by increasing the rising speed of the liquid phase in the vicinity of the membrane surface of the membrane module and enhancing the effect of dispersing bubbles below the membrane module.
  • a dispersion means for dispersing bubbles is provided below the membrane module, and a diffuser tube is disposed below the dispersion means.
  • diffuser tubes having a structure that prevents the discharge holes from being blocked by adhering solids by increasing the diameter of the discharge holes of the bubbles in the diffuser pipes have been proposed (patented) References 2, 3). Specifically, by forming a notch or slit for air discharge along the axial direction of the diffuser tube or perpendicular to the axial direction on the lower side of the diffuser tube arranged in the horizontal direction, A reduction in the amount of air discharged from the lower side of the air diffuser is avoided.
  • the bubbles discharged from the diffuser tube are related to the bubble discharge pressure in the diffuser tube installed in the treatment tank (considering the water depth of the diffuser tube) and the air supply pressure of the diffuser air from the blower.
  • the diameter will be greatly affected. That is, when bubbles are discharged from the air diffuser while the bubble discharge pressure and the air supply pressure are maintained substantially equal, the bubbles to be discharged are formed in the minimum area of the opening of the air diffuser.
  • the air bubbles are discharged from a portion where the bubbles are relatively small in diameter.
  • the discharge flow rate of the bubbles tends to be relatively small. For this reason, the discharge flow rate from the air diffuser is small, the effect of cleaning the film surface becomes insufficient, and the MBR process is hindered.
  • the air supply pressure is set to be larger than the bubble discharge pressure
  • the discharged bubbles are discharged from a portion formed in a wider area of the opening of the diffuser tube. Therefore, the bubbles are likely to have a relatively large diameter.
  • a bubble diameter and a flow volume become large.
  • the discharge flow rate from the air diffusing tube increases, so that the cleaning effect on the film surface can be expected to improve.
  • the discharge bubble diameter becomes large, it is difficult to clean the film surface by uniformly distributing the bubbles, and the cleaning effect becomes insufficient, which impedes MBR processing.
  • an air diffuser described in Patent Document 4 having a cleaning function is known as a measure for preventing clogging of other air diffusers.
  • This air diffuser pushes the activated sludge mixed liquid in the air diffuser to the outside from the opening at the tip by air supplied to the air diffuser at the initial stage of aeration.
  • the residue of the activated sludge mixed liquid in the diffuser is prevented, and even when the activated sludge concentration is high, blockage of the diffused holes due to drying can be avoided.
  • the liquid in the tank is drawn into the diffuser from the discharge hole, and solid matter gradually adheres to the discharge hole. Since clogging occurs, measures to prevent clogging are not sufficient.
  • the MBR processing apparatus of Patent Document 5 that serves both as oxygen supply and membrane cleaning can simultaneously achieve both good dispersion of bubbles supplied to the membrane and high liquid flow velocity near the membrane surface. It has become.
  • the oxygen supply efficiency to the activated sludge it is necessary to increase the contact area at the oxygen transfer interface in the liquid phase as fine bubbles. It is necessary to generate a strong gas-liquid mixed flow due to the upward flow due to.
  • Non-Patent Document 1 a blower facility for the aeration device and the diffuser device is required, and accordingly, the installation space for the facility and the piping line of the air supply system become complicated.
  • JP 2009-106874 A Japanese Patent Laid-Open No. 2001-29987 Japanese Patent Laid-Open No. 10-286444 JP 2001-170677 A JP 2006-2224050 A JP 11-28463 A
  • the air diffuser of the present invention is an air diffuser for aeration to activated sludge and membrane cleaning of the membrane module, and the first air diffuser disposed immediately below the membrane module is not directly below the air diffuser. And a second air diffuser disposed in parallel with the first air diffuser at a position.
  • the first air diffuser is formed such that a plurality of openings are arranged along the axial direction of the member on the lower surface at the position directly below, while a plurality of diffusers having a smaller diameter than the openings are formed. Plural across the cross-section in that direction so that the pores are not directly under the position and are higher than the opening and lower than the axis of the diffuser member along the axial direction. Is formed.
  • the second air diffusion member is formed such that a plurality of openings are arranged along the axial direction of the member on the lower surface thereof, and a plurality of air diffusion holes having a smaller diameter than the opening are provided in the opening.
  • the cross section in the direction is formed so as to be arranged along the axial direction at a position higher than the axis of the diffuser member and lower than the axis of the diffuser member.
  • the top view which showed the positional relationship of the air diffusion apparatus and membrane module in Embodiment 1 of invention.
  • (A) is the front view which showed the positional relationship of the 1st air diffusion member and membrane module in Embodiment 1 of invention,
  • (b) shows the positional relationship of the said 1st air diffusion member and the separation membrane of the said membrane module.
  • the side view shown. is a side view of the first air diffuser of the air diffuser according to Embodiment 1 of the invention,
  • (b) is a cross-sectional view taken along the line AA of the first air diffuser, and
  • (c) is the first air diffuser.
  • BB sectional view (d) is a side view of the second air diffuser of the air diffuser, and (e) is a CC cross sectional view of the second air diffuser.
  • the side view of the aeration apparatus in Embodiment 2 of invention (A) is a side view of the first air diffuser of the air diffuser in Embodiment 3 of the invention, (b) is a cross-sectional view taken along the line AA of the first air diffuser, and (c) is the first air diffuser.
  • (A) is a side view of the first air diffuser of the air diffuser in Embodiment 4 of the invention
  • (b) is a cross-sectional view taken along the line AA of the first air diffuser
  • (b) is the first air diffuser.
  • (C) is a side view of the second air diffuser of the air diffuser
  • (e) is a CC cross sectional view of the second air diffuser.
  • (A) is a perspective view of an air diffuser in Embodiment 5 in which the lower side of the radial cross section forms a semicircular shape
  • (b) is an embodiment 5 in which the upper side of the radial cross section is an obtuse triangle while the lower side forms a semicircular shape.
  • FIG. 7C is a perspective view of the air diffuser in FIG. 5C
  • FIG. 8C is a perspective view of the air diffuser in Embodiment 5 in which the upper side of the radial cross section is an acute triangle and the lower side is a semicircular shape
  • the air diffuser 1 in the embodiment of the present invention shown in FIG. 1 is an air diffuser for cleaning the membrane module 2 and is disposed below the membrane module 2 as shown in FIG.
  • the membrane module 2 is immersed in the activated sludge suspension in the membrane separation tank 4 of the MBR processor 3 as shown in FIG.
  • Examples of the membrane module 2 include those having a separation membrane of a flat membrane type or a hollow fiber membrane type.
  • the membrane module 2 is arranged vertically in the membrane separation tank 4.
  • a pump P is connected to one end of the pipe 5 connected to the water collecting part of the membrane module 2 so that the filtrate can be transferred out of the membrane separation tank 4 by suction.
  • the air diffuser 1 also functions as an aerator for supplying air to the activated sludge and an air diffuser for cleaning the membrane of the membrane module 2.
  • the air diffuser 1 introduces air for membrane cleaning and aeration from the blower B through a pipe 6. By installing a check valve V in the pipe 6, the backflow of the liquid in the tank 4 to the blower B due to the siphon effect when the blower B stops is avoided.
  • the air diffuser 1 includes an air diffuser 11 disposed immediately below the membrane module 2, and an air diffuser 12 disposed in parallel with the air diffuser 11 at a position not directly below the air diffuser 11. .
  • the diffuser tube 11 and the diffuser tube 12 are formed in a cylindrical shape, and both ends thereof are sealed.
  • the air supply pipe 6 of the blower B is connected to one end of the air diffusion pipes 11 and 12 or connected to the inside of the air diffusion pipes 11 and 12. Further, when a spare blower can be prepared, the pipe 6 can be installed for each blower so that the processing can be continued even during the maintenance of the blower. In this case, the air supply pipe of the blower B may be connected to both ends of the air diffuser 1 separately. Or you may connect to one edge part collectively.
  • the air diffuser 11 is formed with an opening 111 and air diffuser holes 112.
  • the pressure of the blower B and the air flow rate are adjusted so that bubbles discharged from the opening 111 can clean at least the membrane surface of the membrane module 2.
  • the opening 111 mainly discharges air used for film cleaning. Further, the opening 111 forms a liquid surface and discharges impurities such as activated sludge that has flowed into the diffuser tube 11 from the liquid surface without drying. As shown in FIG. 3B, a plurality of openings 111 are formed so as to be arranged along the direction of the axis L ⁇ b> 11 of the diffuser tube 11 on the lower surface of the diffuser tube 11 at a position directly below the membrane module 2.
  • the opening diameter and the number of openings 111 are not particularly limited.
  • the membrane surface cleaning of the membrane module 2 can be performed uniformly.
  • the air diffuser 112 is formed higher than the axis L11 of the air diffuser 11, the liquid phase outside the air diffuser 11 flows into the air diffuser 11 little by little from the air diffuser 112, and the liquid phase in the air diffuser 11 is obtained. May be filled up to the level of the air diffuser 112, and the air diffuser 112 is not blocked, but a stable air diffuser cannot be performed.
  • the total length L of the air diffuser 11 is set longer than the effective width L0 of the membrane module 2.
  • a plurality of diffusion tubes 11 may be arranged in parallel according to the area of the bottom surface of the membrane module 2.
  • the diameter D of the air diffuser 11 is as shown in FIGS. 4 (a) to 4 (c). The distance is appropriately set based on the distance between the air diffuser 112 and the membrane module 2 and the distance d between the air diffuser holes 112 separating the longitudinal cross section of the air diffuser 11 in the direction of the axis L11.
  • the air supply pipe 6 when the diameter D of the air diffuser 11 is equal to the diameter (about several tens of millimeters) of the air supply pipe 6 of the blower B, the air supply pipe 6 naturally has a portion of the air diffuser 11 as well as the pressure loss cannot be ignored. But pressure loss cannot be ignored. For this reason, the connection portion of the pipe 6 at the end of the air diffuser 11 has a pressure distribution such that the air supply pressure is higher than that at the other end of the air diffuser 11. As a result, a uniform pressure cannot be maintained in the diffuser tube 11, and it becomes difficult to evenly distribute bubbles from the diffuser tube 11 and clean the membrane surface of the membrane module 2.
  • the diameter D of the air diffusion pipe 11 is set to be larger than the diameter of the air supply pipe 6, the function as a pressure buffer tank is ensured, and the air supply pressure in the air diffusion pipe 11 becomes substantially uniform. Thereby, the distribution of bubbles from the air diffuser 11 becomes uniform, and the membrane surface of the membrane module 2 can be evenly cleaned.
  • the diameter and pitch of the air holes 112 are arranged based on a well-known technique.
  • a diffuser in which a plurality of diffuser holes with a diameter of 5 to 10 mm are formed in a diffuser tube at a pitch of 100 to 200 mm, and an air diffuser speed is set to 10 m / s or more (Patent Document 6, etc.).
  • the air diffuser 12 is arranged in parallel with the air diffuser 11 at a position not directly below the membrane module 2.
  • the diffuser 12 is formed to have substantially the same diameter as the diffuser 11 as shown in FIGS. 4 (d) and 4 (e).
  • An opening 121 and an air hole 122 are formed in the air diffuser 12.
  • a plurality of openings 121 are formed on the lower surface of the air diffuser 12 so as to be disposed along the direction of the axis L12 of the air diffuser 12. Further, the air diffusion holes 122 are formed to have a smaller diameter than the opening 121.
  • a plurality of air diffusion holes 122 are formed symmetrically across the cross section in the direction so as to be disposed along the axis L12 direction at a position higher than the opening 121 and lower than the axis L12.
  • the total length L and diameter D of the air diffuser 12 and the diameters and pitches of the opening 121 and the air diffuser 122 are set to the same specifications as those of the air diffuser 11.
  • the number of the diffuser tubes 11 and 12 is not limited to the illustrated number of installations, and is set as appropriate according to the capacity of the membrane module 2 and the membrane separation tank 4.
  • the air holes 111 and 121 of the air diffusers 11 and 12 are arranged symmetrically with respect to the axial cross section of the air diffusers 11 and 12 as shown in the figure. May be.
  • the pipes 6 connected to the diffuser pipes 11 and 12 are well known so that the flow rate and pressure of the air supplied to the diffuser pipes 11 and 12 can be individually adjusted.
  • a flow control valve and a pressure regulator are installed as appropriate.
  • the liquid phase in the membrane separation tank 4 to which the water to be treated is supplied is always aerated by the aeration pipes 11 and 12 of the aeration apparatus 1, and the aeration amount is determined by the dissolved oxygen concentration of the liquid phase being predetermined. It is controlled to be within the range of.
  • the activated sludge in the separation membrane tank 4 biologically decomposes pollutants in the liquid phase using oxygen provided by this aeration.
  • the liquid phase in the membrane separation tank 4 is supplied to the membrane module 2 by the water flow by the aeration and subjected to solid-liquid separation processing.
  • the inside of the separation membrane 20 of the membrane module 2 is in a negative pressure state by the suction pump P, and the filtered water that has permeated into the water collecting passage of the membrane module 2 is carried out of the membrane separation tank 4 by the suction pump P.
  • air bubbles 100 provided from the blower B are constantly released from the air diffuser holes 112 of the air diffuser tube 11.
  • oxygen is provided to the sludge.
  • the air diffuser 11 has a circular cross section in the radial direction and the position of the air diffuser 112 is set lower than the height of the axis L11 of the air diffuser 11. Therefore, the rising bubbles discharged from the air diffuser 112 are scattered. Ascending along the outer peripheral surface of the trachea 11, the gas-liquid mixed flow is disturbed, and the bubbles 100 are dispersed. Thereby, the contact area of the oxygen movement interface in a liquid phase increases, and the oxygen supply efficiency with respect to the said activated sludge increases.
  • bubbles having a diameter larger than at least the bubbles 100 are discharged from the opening 111 of the air diffuser 11 and used for membrane cleaning of the membrane module 2. Furthermore, impurities such as activated sludge are discharged from the opening 111. Further, since the radial cross section in the radial direction of the air diffuser 11 is circular, the activated sludge staying near the lower end of the membrane module 2 is guided downward along the peripheral surface of the air diffuser 11, and Accumulation of activated sludge on the top surface is avoided. This prevents a reduction in the absolute amount of the activated sludge that contributes to the decomposition of the pollutant.
  • the violent gas-liquid mixed flow bypassing the division is introduced between the individual separation membranes 20 of the membrane module 2 and used for cleaning the surface of the separation membrane 20.
  • Contaminants separated from the surface of the separation membrane 20 by this washing ride on the gas-liquid mixed flow and are discharged from the upper end opening of the membrane module 2 or settle near the bottom of the membrane separation tank 4.
  • the activated sludge contained in the separated impurities contributes to biological decomposition of the pollutant in the membrane separation tank 4.
  • air bubbles provided from the blower B are always released from the air diffuser holes 122 in the same manner as the air diffuser 11. These bubbles also come into contact with the activated sludge to provide oxygen to the sludge. Further, bubbles having a diameter larger than that of the bubbles are discharged from the opening 121 and impurities such as activated sludge are discharged from the opening 121. In this way, oxygen can be supplied evenly to the activated sludge staying away from the membrane module 2 in the membrane separation tank 4, and the activated sludge concentration in the liquid phase can be made uniform.
  • the oxygen supply efficiency for the activated sludge and the membrane cleaning efficiency of the membrane module 2 are increased without blocking the air diffusion holes 112 and 122 of the air diffusion tubes 11 and 12. Can improve the processing efficiency and reduce energy consumption.
  • the above air diffuser 20 has an integral structure with the membrane module 2, there is no need to remove the pipe 6 from the air diffuser 20, and the membrane module 2 can be moved above the membrane separation tank 4. Therefore, the work efficiency at the time of the maintenance of the membrane joule 2 is improved. Even if the air diffuser 20 is not integrated with the membrane module 2, the membrane module 2, the air diffuser 20, and the pipe 6 can be taken out and handled individually, so that maintenance is facilitated.
  • the air diffuser 30 according to the third embodiment is the air diffuser 1 except that the shape of the cross section in the radial direction of the air diffusers 11 and 12 is rectangular as shown in FIGS. 6 (a) to 6 (e). It has the same configuration. According to this aspect, the manufacture of the air diffuser and the fixing work in the membrane separation tank 4 are facilitated.
  • the air diffuser 40 according to the fourth embodiment is an air diffuser except that the shape of the cross section in the radial direction of the air diffusers 11 and 12 is an inverted triangle as shown in FIGS. 7 (a) to 7 (e). 1 has the same configuration. According to this aspect, since the plate-like member can be constituted by three pieces, the manufacture of the air diffuser according to the present invention is further facilitated.
  • the air diffuser in the fifth embodiment is an air diffuser except that the shape of the cross section in the radial direction of the air diffusers 11 and 12 is any one of those shown in FIGS. 8 (a) to 8 (d). 1 has the same configuration.
  • the upper side of the radial cross section is an obtuse triangle, while the lower side is semicircular.
  • the upper side of the radial cross section is an acute triangle, while the lower side is a semicircular shape.
  • the air diffusers 11 and 12 of the air diffuser 54 shown in FIG. 8D have a bell-shaped upper side in the radial cross section, while the lower side has a semicircular shape.
  • the air diffusers 52 to 54 are formed so that the radial cross sections of the air diffusers 11 and 12 are convex upward, the activated sludge can be efficiently guided below the air diffusers 11 and 12. , 12 can avoid the accumulation of activated sludge.
  • the diffuser 54 is a gas-liquid mixed flow that rises along the curved surfaces of the diffuser pipes 11 and 12, similarly to the diffuser apparatus 1. Can be swirled above the diffuser tubes 11 and 12, and this swirling flow can be maintained. Thereby, a vigorous gas-liquid mixed flow is continued above the diffuser tubes 11 and 12, and the dispersion of bubbles is promoted.
  • the diffuser of the present invention can be handled by changing the specifications as appropriate according to the specifications of the membrane module. For example, the number of installed devices is changed according to the air diffusing area of the air diffusing device, and a plurality of air diffusing devices are installed for a single membrane module. Further, the specifications such as the length of the air diffuser are changed according to the required area of the air diffuser of the membrane module.
  • Air diffuser 2 ... Membrane module 6 ... Pipe 11 . Air diffuser (first air diffuser) 12 . Air diffuser (second air diffuser) 111, 121 ... opening 112, 122 ... diffuse hole

Abstract

Diffuseur d'air (1) équipé d'un tube d'aération (11) placé directement au-dessous d'un module à membrane (2) et de tubes d'aération (12) parallèles au tube d'aération (11) et en des positions qui ne se trouvent pas directement au-dessous du module à membrane. Bien qu'une pluralité de parties d'ouverture soit formée dans le sens axial du tube (11) sur la surface inférieure dudit tube d'aération (11) placé directement au-dessous du module à membrane (2), une pluralité de trous d'aération d'un diamètre plus petit que celui des parties d'ouverture est formée de façon à se trouver dans une position qui n'est pas directement au-dessous du module à membrane, et plus haut que les parties d'ouverture et plus bas que l'axe du tube (11) dans le sens axial de façon à prendre en sandwich une coupe transversale dans ce sens. Bien qu'une pluralité de parties d'ouverture soit formée sur la surface inférieure des tubes d'aération (12) dans le sens axial des tubes (12), une pluralité de trous d'aération d'un diamètre plus petit que celui des parties d'ouverture est formée de façon à se trouver plus haut que les parties d'ouverture et plus bas que l'axe des tubes (12) dans le sens axial et à prendre en sandwich une coupe transversale dans ce sens.
PCT/JP2012/062146 2011-07-14 2012-05-11 Diffuseur d'air WO2013008522A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015049590A3 (fr) * 2013-10-04 2015-06-18 Ovivo Luxembourg S.a.r.l. Aération à tailles de bulles variables, ajustables pour le lavage à l'air avec membrane immergée
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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016527081A (ja) * 2013-08-08 2016-09-08 ロッテ ケミカル コーポレーション 散気装置および分離膜生物反応槽
JP6308062B2 (ja) * 2013-09-26 2018-04-11 三菱ケミカル株式会社 散気装置および水処理装置
JP2016215165A (ja) * 2015-05-25 2016-12-22 三菱レイヨン株式会社 水処理方法及び水処理装置
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 (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114564U (fr) * 1975-09-26 1977-08-31
JPH10286444A (ja) * 1997-04-11 1998-10-27 Maezawa Ind Inc 浸漬型膜ろ過装置
JP2001334285A (ja) * 2000-05-25 2001-12-04 Japan Organo Co Ltd 有機性排水の生物処理装置
JP2002102661A (ja) * 2000-10-02 2002-04-09 Mitsubishi Rayon Co Ltd 固液分離装置
JP2002210486A (ja) * 2000-11-17 2002-07-30 Mitsubishi Heavy Ind Ltd 洗濯排水の処理方法及び装置
JP2007268415A (ja) * 2006-03-31 2007-10-18 Toray Ind Inc 浸漬型膜分離装置および造水方法
JP2008200639A (ja) * 2007-02-22 2008-09-04 Kurita Water Ind Ltd 有機物含有水の生物処理方法
JP2008238042A (ja) * 2007-03-27 2008-10-09 Unitika Ltd 有機性汚泥の減量化方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3258553B2 (ja) * 1996-02-23 2002-02-18 株式会社クボタ 膜分離装置
JP3668570B2 (ja) * 1996-09-27 2005-07-06 三菱レイヨン株式会社 膜処理装置
JP2009233622A (ja) * 2008-03-28 2009-10-15 Hitachi Ltd 水処理装置
JP2010104932A (ja) * 2008-10-31 2010-05-13 Suido Kiko Kaisha Ltd 散気装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114564U (fr) * 1975-09-26 1977-08-31
JPH10286444A (ja) * 1997-04-11 1998-10-27 Maezawa Ind Inc 浸漬型膜ろ過装置
JP2001334285A (ja) * 2000-05-25 2001-12-04 Japan Organo Co Ltd 有機性排水の生物処理装置
JP2002102661A (ja) * 2000-10-02 2002-04-09 Mitsubishi Rayon Co Ltd 固液分離装置
JP2002210486A (ja) * 2000-11-17 2002-07-30 Mitsubishi Heavy Ind Ltd 洗濯排水の処理方法及び装置
JP2007268415A (ja) * 2006-03-31 2007-10-18 Toray Ind Inc 浸漬型膜分離装置および造水方法
JP2008200639A (ja) * 2007-02-22 2008-09-04 Kurita Water Ind Ltd 有機物含有水の生物処理方法
JP2008238042A (ja) * 2007-03-27 2008-10-09 Unitika Ltd 有機性汚泥の減量化方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015049590A3 (fr) * 2013-10-04 2015-06-18 Ovivo Luxembourg S.a.r.l. Aération à tailles de bulles variables, ajustables pour le lavage à l'air avec membrane immergée
US9862628B2 (en) 2013-10-04 2018-01-09 Ovivo Inc. Adjustable variable bubble size aeration for submerged membrane air scour
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
US9956530B2 (en) 2014-10-22 2018-05-01 Koch Membrane Systems, Inc. Membrane module system with bundle enclosures and pulsed aeration and method of operation
US10702831B2 (en) 2014-10-22 2020-07-07 Koch Separation Solutions, 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
USD779631S1 (en) 2015-08-10 2017-02-21 Koch Membrane Systems, Inc. Gasification device

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