WO2012081481A1 - Tube de diffuseur - Google Patents

Tube de diffuseur Download PDF

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Publication number
WO2012081481A1
WO2012081481A1 PCT/JP2011/078357 JP2011078357W WO2012081481A1 WO 2012081481 A1 WO2012081481 A1 WO 2012081481A1 JP 2011078357 W JP2011078357 W JP 2011078357W WO 2012081481 A1 WO2012081481 A1 WO 2012081481A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
partition plate
air
air supply
supply pipe
Prior art date
Application number
PCT/JP2011/078357
Other languages
English (en)
Japanese (ja)
Inventor
一水 立川
勝美 藤田
Original Assignee
メタウォーター株式会社
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.)
Filing date
Publication date
Application filed by メタウォーター株式会社 filed Critical メタウォーター株式会社
Publication of WO2012081481A1 publication Critical patent/WO2012081481A1/fr

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    • 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
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23113—Mounting the bubbling devices or the diffusers characterised by the disposition of the bubbling elements in particular configurations, patterns or arrays
    • 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
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23115—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle
    • B01F23/231153—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle the bubbling devices being suspended on a supporting construction, i.e. not on a floating construction
    • 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
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23341—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer with tubes surrounding the stirrer
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2335—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the direction of introduction of the gas relative to the stirrer
    • B01F23/23354—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the direction of introduction of the gas relative to the stirrer the gas being driven away from the rotating stirrer
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
    • B01F23/23362—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced under the stirrer
    • 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
    • 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

  • a diffusion cylinder (diffuser) is installed in the aeration tank for storing the treated water.
  • the scattering cylinder is made of a porous material such as ceramics, and has a cylindrical shape in which one end is closed and the other end is opened.
  • the end of the open cylinder is connected to the header pipe, and air is supplied to the inside through the header pipe.
  • the air supplied to the inside of the dust cylinder passes through the pores in the peripheral wall of the dust cylinder, which is porous, foams, becomes millimeter-sized fine bubbles, and is discharged into the water to be treated.
  • Patent Document 1 a conventional dust cylinder is installed in a horizontally placed state in which the axial direction thereof is a horizontal direction, and there is a problem that a certain amount of installation space is required.
  • the inside diameter of the draft tube must be larger than the total length of the diffuser cylinder.
  • the conventional dust cylinder has a single space (air chamber) inside, and the pressure in the space when air is supplied into the dust cylinder is substantially uniform throughout the space.
  • the pressure in the space when air is supplied into the dust cylinder is substantially uniform throughout the space.
  • fine bubbles are less likely to be released than in the upper part of the dust cylinder where the surrounding water pressure is low. For this reason, many fine bubbles are emitted in the upper part of the scattering cylinder, but almost no minute bubbles are emitted in the lower part, and the entire scattering cylinder cannot be used effectively, and high foaming efficiency cannot be obtained.
  • the present invention has been made in view of such a conventional situation, and the object of the present invention is that it can be installed in a narrow space that cannot be installed in a horizontal type cylindrical cylinder, It is an object of the present invention to provide a dust cylinder that can discharge the dust uniformly from the whole dust cylinder.
  • a diffused cylinder whose axial direction is the vertical direction, a cylindrical diffuser member made of a porous material, and an upper partition plate that hermetically closes the upper end and the upper opening of the diffuser member
  • a plurality of diffused cylinder partitions having an air chamber partitioned by a lower partition plate that hermetically closes a lower end portion and a lower opening of the diffuser member, and the upper partition of each of the diffused cylinder partitions
  • a portion provided in each air chamber of the air supply pipe including an air supply pipe that penetrates at least one of the plate and the lower partition plate and connects the plurality of divided cylinder divided bodies in the vertical direction.
  • at least one orifice that communicates from the air supply pipe to the air chamber is provided for each air chamber, and the larger the diameter of the orifice that communicates with the air chamber located at a lower position ( The first cylinder).
  • the air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction, and is located in each air chamber among the plurality of orifices and has a desired diameter.
  • a cylindrical cylinder whose axial direction is the vertical direction, an outer cylindrical body, an inner cylindrical body made of a porous material arranged at a predetermined interval on the inner side thereof, and the outer cylindrical body
  • a ring-shaped upper side that hermetically closes an upper opening formed between the upper end of the body, the upper end of the inner cylindrical body, and the upper end of the outer cylindrical body and the upper end of the inner cylindrical body
  • a plurality of split cylinder divided bodies having an air chamber partitioned by a ring-shaped lower partition plate that hermetically seals the inner partition, and the upper partition plate and the lower partition plate of each of the split cylinder divided bodies
  • An air supply pipe that penetrates at least one of the cylinders and connects the plurality of split cylinder divided bodies in the vertical direction, and the air supply At least one orifice that communicates from
  • the air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction, and is located in each air chamber among the plurality of orifices and has a desired diameter.
  • the axial direction is a direction in which the internal space (hollow part) of the dust cylinder extends, and “being in the vertical direction” means that the axial direction of the dust cylinder is the vertical direction. Means that it can be installed.
  • “upper”, “lower”, “upper end”, “lower end”, “upper side”, and “lower side” are the cylinders of the present invention so that the axial direction thereof is the vertical direction. It shows the direction and position (part) in the installed state.
  • the “porous material” includes those in which fine holes are formed in the sheet-like member, and the material is not limited as long as air can be discharged through the fine holes.
  • the material in addition to ceramics and synthetic resin, it may be made of a cloth in which fine holes are formed.
  • micropore refers to a hole whose diameter of a perfect circle having an area equal to the area of its cross section is about 50 to 500 ⁇ m, a width of about 50 to 500 ⁇ m, and a length of 0.5 to 2. It refers to a slit of about 0 mm.
  • “made of a porous material” includes not only the case where the whole is formed of a porous material but also the case where a part thereof is formed of a porous material.
  • the “cylindrical shape” in the present invention means that the cross section is annular, and the shape of the inner periphery and outer periphery is not limited as long as the cross section is annular.
  • the shape of the inner periphery or outer periphery of the cross section may be a circle or an ellipse, or may be a polygon such as a long rectangle or a triangle.
  • the cylindrical cylinder according to the present invention is a vertical type cylindrical cylinder whose axial direction is the vertical direction, it can be installed in a narrow space that cannot be installed in a conventional horizontal type cylindrical cylinder. The restrictions are relaxed. Further, the spread cylinder of the present invention has a plurality of air chambers separated from each other in the axial direction, and the diameter of the orifice communicating the air supply pipe and each air chamber leads to the air chamber located further below. Since the orifice is adjusted so as to become larger, the air chamber located at a lower position has a higher internal pressure. For this reason, even in the lower part of the surrounding cylinder where the water pressure is high, it is possible to discharge the fine bubbles of the same amount as the upper part of the surrounding cylinder where the surrounding water pressure is low. As a result, the fine bubbles can be evenly discharged from the entire scattering cylinder, the entire scattering cylinder can be used effectively, and high foaming efficiency can be obtained.
  • FIG. 6 is an explanatory diagram showing an example in which the inner cylindrical surface that becomes the air diffusion surface is inclined by changing the diameter of the inner cylindrical member in a tapered shape in the second diffusion cylinder of the present invention. . It is explanatory drawing which shows the example of installation at the time of installing the 2nd diffuser cylinder of this invention in the draft tube installed in the aeration tank.
  • FIG. 1 is an explanatory view showing an example of an embodiment of a first dust cylinder of the present invention.
  • some members such as the aeration member 4 are drawn in cross section.
  • a first split cylinder 1 of the present invention is a vertically placed type split cylinder whose axial direction is the vertical direction, and includes a plurality of split cylinder divisions 2 (2A to 2E) and an air supply pipe 3.
  • the diffused cylinder divided body 2 (2A to 2E) hermetically closes the cylindrical diffuser member 4 (4A to 4E) made of a porous material, and the upper end and the upper opening of the diffuser members 4A to 4E.
  • An air chamber 6 (6A to 6E) partitioned by a partition plate (upper partition plate) and a partition plate (lower partition plate) that hermetically closes the lower ends and lower openings of the diffusion members 4A to 4E.
  • a plurality of split cylinder divisions 2A to 2E are arranged in close contact with each other.
  • the upper partition plate of the body is a common single partition plate.
  • the lower partition plate of the split cylinder divided body 2A and the upper partition plate of the split cylinder divided body 2B constitute a common single partition plate 5B.
  • the lower partition plate of the split cylinder partition 2B and the upper partition plate of the split cylinder partition 2C form a common single partition plate 5C, and the lower partition plate of the split cylinder partition 2C.
  • the upper partition plate of the split cylinder partition 2D are a common single partition plate 5D, and the lower partition plate of the split cylinder partition 2D and the upper partition plate of the split cylinder partition 2E are , A common single partition plate 5E.
  • porous material constituting the diffuser member 4 As the porous material constituting the diffuser member 4 (4A to 4E), materials used in conventional diffusion cylinders, such as ceramics, porous resins, etc., can be used, particularly strength and chemical stability. Ceramics are preferably used from the viewpoint of properties and the like.
  • the porosity of the air diffusing member 4 is not particularly limited.
  • the pore diameter of the air diffusing member 4 is not particularly limited, but is preferably about 50 to 500 ⁇ m from the viewpoint of foaming fine bubbles having a size that is easily dissolved in the water to be treated.
  • the porous material which comprises the air diffusing member 4 may be the same for all the air diffusing members 4, or different properties (materials and porosity) for each air diffusing member 4 in consideration of water depth and the like. The porous material may be used.
  • the partition plate 5 has a hole 7 for penetrating the air supply pipe in the vicinity of the center thereof, and the hole 7 has a cylindrical shape.
  • a plate-like partition plate having no such socket 8 may be used.
  • stainless steel for example, SUS304
  • a packing 10 made of chloroprene rubber, foamed polyurethane, or the like is disposed between the partition plate 5 (5A to 5E) and the diffuser member 4, to improve airtightness in order to prevent air leakage when the diffuser cylinder 1 is used. It is preferable.
  • the air supply pipe 3 passes through at least one of the upper partition plate and the lower partition plate of each of the divided cylinder division bodies 2A to 2E and connects the plurality of divided cylinder division bodies 2A to 2E in the vertical direction.
  • orifices 9A to 9E communicating from the air supply pipe 3 to the air chambers 6A to 6E are respectively provided to the air chambers 6A to 6E.
  • At least one is provided, and the diameter of the orifice 9 leading to the air chamber 6 located below becomes larger. That is, in the present embodiment, the diameter increases in the order of the orifice 9A, the orifice 9B, the orifice 9C, the orifice 9D, and the orifice 9E.
  • the air supply pipe 3 is closed at one end and opened at the other end, and air is supplied into the air supply pipe 3 from the opening at the other end.
  • the lower end of the air supply pipe 3 is closed by the plug 11 so that air is supplied from the opening 12 at the upper end.
  • stainless steel for example, SUS304
  • SUS304 stainless steel
  • the air supplied into the air supply pipe 3 from the opening 12 at the upper end of the air supply pipe 3 first moves to the air chambers 6A to 6E through the orifices 9A to 9E.
  • the air chambers 6A to 6E pass through the pores of the air diffusers 4A to 4E and are foamed to form millimeter-sized fine bubbles. Released into the water to be treated.
  • the surrounding water pressure increases from the upper part to the lower part of the dust cylinder. Therefore, if the pressure in the space (air chamber) inside the diffusion cylinder is almost uniform throughout the space, fine bubbles are formed in the lower part of the diffusion cylinder where the surrounding water pressure is high compared to the upper part of the diffusion cylinder where the surrounding water pressure is low. Is less likely to be released.
  • the plurality of air chambers 6A to 6E are formed separately in the axial direction (vertical direction), and the diameter of the orifice 9 leading to the air chamber 6 located below is larger. It was made to become.
  • the specific diameter of the orifice 9 can be determined in consideration of the water pressure at the water depth where the diffuser cylinder 1 is installed, the air permeation resistance of the porous material constituting the diffuser member 4 and the like.
  • the entire dust cylinder 1 can be effectively used for foaming fine bubbles, and high foaming efficiency can be obtained.
  • five split cylinder divisions 2A to 2E are used to configure the split cylinder 1, but the number of split cylinder divisions used to configure one split cylinder is used. There is no restriction other than being plural, and the number can be determined as appropriate according to the overall length of the target scattering cylinder 1 or the like.
  • One guideline for determining the number of split cylinder divisions is to set the number so that the length per one of the split cylinder divisions is 100 mm or less. When the length per one split cylinder division exceeds 100 mm, a large water pressure difference is generated between the upper and lower sides of one split cylinder division, and the amount of discharge of fine bubbles is likely to be different.
  • FIG. 3 is an explanatory view showing another example of the embodiment of the first dust cylinder of the present invention.
  • the embodiment shown in FIG. 3 will be described with a focus on the differences from the embodiment shown in FIG. 1 described above.
  • a plurality of cylinder divided bodies 2 (2F to 2H) are divided. Are closely spaced and spaced apart.
  • the lower partition plate located above and the upper side of the split cylinder division located therebelow.
  • the partition plate cannot be a common single partition plate, and needs to be separate partition plates. That is, in the example of FIG.
  • the lower partition plate 5H of the split cylinder divided body 2F and the upper partition plate 5I of the split cylinder divided body 2G are separate, and similarly, the lower partition plate 2G of the lower cylinder divided body 2G
  • the partition plate 5J and the upper partition plate 5K of the split cylinder divided body 2H are separate bodies.
  • 3 is provided with three air chambers 6 (6F to 6H).
  • the diameters and lengths of the diffuser members 4 (4F to 4H) constituting the diffuser cylinder divided bodies 2 (2F to 2H) are not the same, and are configured to be different.
  • the diffuser cylinder 1 of FIG. 3 is configured such that the diameter of the air supply pipe 3 is not constant but the diameter changes in the length direction.
  • the air supply pipe 3 does not penetrate the lower partition plate 5L located in the lowermost part of the dust cylinder division body 2H, and its lower end is located in the lowermost air chamber 6H. Exists.
  • the air supply pipe 3 is provided with an orifice 9 (9F to 9H) communicating with the air chamber 6 (6F to 6H), and the orifice 9H is provided at the lower end of the air supply pipe 3. Since the lower partition plate 5L located at the lowermost position of the split cylinder division 2H is not penetrated by the air supply pipe 3 as described above, it penetrates through the air supply pipe 3 like the other partition plates 5G to 5K. No hole is formed for this purpose.
  • FIG. 4 is an explanatory view showing still another example of the embodiment of the first dust cylinder of the present invention.
  • the embodiment shown in FIG. 4 will be described mainly with respect to the difference from the embodiment shown in FIG. 1.
  • a plurality of dispersion cylinder division bodies 2 (2I to 2K) are provided.
  • some of the split cylinder divisions 2I and 2J are closely arranged, and the remaining split cylinder divisions 2K are arranged at intervals.
  • the lower partition plate of the split cylinder division 2I and the upper partition plate of the split cylinder division 2J that is in close contact with the lower partition plate 2I constitute a common single partition plate 5N.
  • the lower partition plate 2O of 2J and the upper partition plate 5P of the split cylinder divided body 2K located therebelow are separate. 4 is provided with three air chambers 6 (6I to 6K).
  • the first dust cylinder of the present invention can obtain the same effects as those of the embodiment shown in FIG. 1 even when configured as in the embodiments shown in FIGS.
  • the air supply pipe 3 is originally provided with a plurality of orifices 9 having different diameters along the axial direction.
  • the orifices 9 are used in a closed state. preferable.
  • the air supply pipe 3 provided with a plurality of orifices 9 having different diameters along the axial direction is prepared in advance, and only the necessary orifices are left as they are, and unnecessary orifices are closed.
  • the manufacturing efficiency of the scattering cylinder can be increased.
  • FIG. 6 is an explanatory diagram showing an installation example when the first dust cylinder 1 of the present invention is installed in a draft tube installed in an aeration tank.
  • the opening of the air supply pipe of each dust cylinder 1 is connected to the header pipe 16, and air is supplied from the outside through the header pipe 16. Supply air into the tube.
  • the air supplied into the air supply pipes of the individual scattering cylinders 1 is discharged into the draft tube 15 as fine bubbles from the individual scattering cylinders 1, and the treated water containing the discharged fine bubbles is discharged into the draft tube 15.
  • the impeller 17 installed on the upper side of the upper part of the pipe is turned downward to be discharged downward from the draft tube 15 and circulates in the aeration tank.
  • the header pipe 16 is arranged above the diffusion cylinder 1, but air is supplied from below the diffusion pipe 1 so that the header pipe 16 is arranged below the diffusion cylinder 1. May be. Further, in the example of FIG. 6, the ring-shaped header pipe 16 is used, but the shape of the header pipe can be appropriately changed depending on the arrangement and the number of the scattering cylinders 1. Also, a plurality of diffuser cylinders 1 may be installed as in this example, or only one may be installed according to the required amount of diffused air.
  • FIG. 7 is an explanatory view showing an example of an embodiment of the second dust cylinder of the present invention.
  • some members such as the outer cylindrical body 24 and the inner cylindrical body 25 are drawn in cross section in order to make the internal structure of the scattering cylinder 21 easier to understand.
  • the second cylindrical cylinder 21 of the present invention is a vertical type cylindrical cylinder whose axial direction is the vertical direction, and includes a plurality of cylindrical cylinder divided bodies 22 (22A to 22A to 22A) as its constituent elements. 22C) and an air supply pipe 23.
  • the split cylinder divided body 22 (22A to 22C) includes an outer cylindrical body 24 (24A to 24C) and an inner cylindrical body 25 (25A to 25C) made of a porous material arranged at a predetermined interval on the inner side thereof. Between the upper ends of the outer cylindrical bodies 24A to 24C, the upper ends of the inner cylindrical bodies 25A to 25C, and the upper ends 24A to 24C of the outer cylindrical bodies and the upper ends of the inner cylindrical bodies 25A to 25C.
  • a ring-shaped partition plate (upper partition plate) that hermetically closes the formed upper opening, the lower ends of the outer cylindrical bodies 24A to 24C, the lower ends of the inner cylindrical bodies 25A to 25C, and the outer cylindrical body 24A.
  • a plurality of split cylinder divisions 22A to 22C are arranged in close contact with each other.
  • the upper partition plate of the body is a common single partition plate.
  • the lower partition plate of the split cylinder divided body 22A and the upper partition plate of the split cylinder divided body 22B constitute a common single partition plate 26B.
  • the lower partition plate of the split cylinder divided body 22B and the upper partition plate of the split cylinder divided body 22C constitute a common single partition plate 26C.
  • a porous material constituting the inner cylindrical body 25 As a porous material constituting the inner cylindrical body 25 (25A to 25C), a material used in a conventional powder cylinder, for example, ceramics, a porous resin, or the like can be used. Ceramics are preferably used from the viewpoint of stability and the like.
  • the porosity of the inner cylindrical body 25 is not particularly limited.
  • the pore diameter of the inner cylindrical body 25 is not particularly limited, but from the viewpoint of foaming fine bubbles having a size that is easily dissolved in the water to be treated, a pore diameter of about 50 to 500 ⁇ m is preferable.
  • the material constituting the outer cylindrical body 24 may be a porous material as with the inner cylindrical body 25, or may be a non-porous material.
  • the inner peripheral surface of the inner cylindrical body 25 is desired to be a diffused surface from which fine bubbles are discharged, only the inner cylindrical body 25 is made of a porous material and added to the inner peripheral surface of the inner cylindrical body 25.
  • both the inner cylindrical body 25 and the outer cylindrical body 24 are made of a porous material.
  • the preferable pore diameter and porosity when the outer cylindrical body 24 is made of a porous material are the same as the preferable pore diameter and porosity of the inner cylindrical body 25.
  • the partition plate 26 is a ring-shaped plate-like body having a hole 28 for penetrating the air supply pipe (however, the lowermost partition in the embodiment of FIG. 7).
  • the plate 26D does not have the hole 28 because the air supply pipe does not pass through.
  • stainless steel for example, SUS304
  • SUS304 stainless steel
  • a packing made of chloroprene rubber, polyurethane foam, or the like is disposed to prevent air leakage when the dust cylinder 21 is used. You may make it raise.
  • an inner peripheral surface of the outer cylindrical body 24 and an outer periphery of the inner cylindrical body 25 are used as a method of maintaining a predetermined distance between the outer cylindrical body 24 and the inner cylindrical body 25.
  • a spacer 30 for maintaining a gap may be disposed between the surface and the partition plate 26 may have a similar spacer function.
  • the air supply pipe 23 passes through at least one of the upper partition plate and the lower partition plate of each of the divided cylinder division bodies 22A to 22C and connects the plurality of divided cylinder division bodies 22A to 22C in the vertical direction.
  • two air supply pipes 23 are used, but the number of air supply pipes 23 is not particularly limited, and may be one or more.
  • orifices 29A to 29C communicating from the air supply pipe 23 to the air chambers 27A to 27C are provided at least with respect to the air chambers 27A to 27C, respectively.
  • One is provided, and the diameter of the orifice 29 leading to the air chamber 27 located below becomes larger. That is, in the present embodiment, the diameter increases in the order of the orifice 29A, the orifice 29B, and the orifice 29C.
  • the air supply pipe 23 is closed at one end and opened at the other end, and air is supplied into the air supply pipe 23 from the opening at the other end.
  • the lower end of the air supply pipe 23 is closed by being in close contact with the surface of the lowermost partition plate 26D, and air is supplied from the opening 32 at the upper end.
  • stainless steel for example, SUS304
  • SUS304 stainless steel
  • the air supplied into the air supply pipe 23 from the opening 32 at the upper end of the air supply pipe 23 first moves to the air chambers 27A to 27C through the orifices 29A to 29C. Then, as the pressure inside each of the air chambers 27A to 27C rises, the pores of the inner cylindrical bodies 25A to 25C (the outer cylindrical bodies 24A to 24C are also made of a porous material) facing the air chambers 27A to 27C. In this case, the foam passes through the pores of the inner cylindrical bodies 25A to 25C and the pores of the outer cylindrical bodies 24A to 24C) and becomes micro-sized fine bubbles that are discharged into the water to be treated.
  • the surrounding water pressure increases from the upper part to the lower part of the dust cylinder. Therefore, if the pressure in the space (air chamber) inside the diffusion cylinder is almost uniform throughout the space, fine bubbles are formed in the lower part of the diffusion cylinder where the surrounding water pressure is high compared to the upper part of the diffusion cylinder where the surrounding water pressure is low. Is less likely to be released.
  • the plurality of air chambers 27A to 27C are formed separately in the axial direction (vertical direction), and the diameter of the orifice 29 leading to the air chamber 27 located below is larger. It was made to become.
  • the specific diameter of the orifice 29 can be determined in consideration of the water pressure at the water depth in which the diffusion cylinder 21 is installed, the air permeation resistance of the porous material constituting the inner cylindrical body 25 and the like.
  • the entire scattering cylinder 21 can be effectively used for foaming of fine bubbles, and high foaming efficiency can be obtained.
  • three split cylinder divisions 22A to 22C are used to configure the split cylinder 21, but the number of split cylinder divisions used to configure one split cylinder is used. There is no limit other than being plural, and the number can be appropriately determined according to the total length of the target dust cylinder 21 or the like.
  • One guideline for determining the number of split cylinder divisions is to set the number so that the length per one of the split cylinder divisions is 100 mm or less. When the length per one split cylinder division exceeds 100 mm, a large water pressure difference is generated between the upper and lower sides of one split cylinder division, and the amount of discharge of fine bubbles is likely to be different.
  • the second cylinder according to the present invention as in the case of the first cylinder according to the present invention, some of the plurality of divided cylinder divisions or all of the divided cylinder divisions are closely connected.
  • the outer cylinders and the inner cylinders constituting each of the cylinder divisions are not the same in diameter and length in all the cylinder divisions.
  • the air supply pipes may be configured to be different from each other, or the diameter of the air supply pipe may not be constant, and the diameter may be changed in the length direction.
  • the diameter of the inner cylindrical body 25 may be changed to a tapered shape so that the inner peripheral surface of the inner cylindrical body 25 serving as a diffuser surface is inclined.
  • the air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction.
  • the orifices other than those having a desired diameter are closed and used in a state in which they are closed, from the viewpoint of improving the production efficiency of the scattering cylinder.
  • FIG. 11 is an explanatory view showing an installation example when the second dust cylinder of the present invention is installed in a draft tube installed in an aeration tank.
  • the opening of the air supply pipe of the dust cylinder 21 is connected to the header pipe 16, and air is supplied from the outside through the header pipe 16. Supply air into the tube.
  • the air supplied into the air supply pipe of the scattering cylinder 21 is discharged as fine bubbles from the scattering cylinder 21 into the draft tube 15, and the treated water containing the discharged fine bubbles is disposed above the draft tube 15.
  • the impeller 17 installed at the bottom of the pipe is turned downward and discharged from the lower side of the draft tube 15 to the outside of the draft tube 15 to circulate in the aeration tank.
  • the outer peripheral surface of the dust cylinder 21 (outer peripheral surface of the outer cylindrical body 24) is in close contact with the inner peripheral surface of the draft tube 15, and the inner peripheral surface (inner cylindrical shape) of the dust cylinder 21.
  • the fine bubbles are discharged only from the inner peripheral surface of the body 25, but the outer periphery of the dust cylinder 21 is provided with a space between the outer peripheral surface of the dust cylinder 21 and the inner peripheral surface of the draft tube 15. Fine bubbles may also be released from the surface.
  • only one diffuser cylinder 21 is installed in the draft tube 15, but even if only one diffuser cylinder 21 is installed in this way, depending on the required amount of diffused air. You may install more than one.
  • Example 1 A bulk cylinder having the structure shown in FIG. 1 was produced. Cylindrical sintered bodies (length: 100 mm, outer diameter 75 mm, inner diameter 45 mm, average pore diameter 200 ⁇ m) made of ceramics were used for the diffuser members 4A to 4E constituting the diffused cylinder divided bodies 2A to 2E, respectively. .
  • the partition plates 5A to 5F are made of SUS304 and have a cylindrical socket 8 (length: 43 mm, outer diameter) in a hole of a disc (diameter: 85 mm, thickness: 3 mm) having a hole 7 in the center. 38 mm and inner diameter 34 mm) were integrally joined.
  • a ring-shaped packing 10 (outer diameter 75 mm, inner diameter 47 mm, thickness: 3 mm) made of chloroprene rubber was disposed between the partition plates 5A to 5F and the diffuser members 4A to 4E.
  • the air supply pipe 3 is provided with two orifices 9A to 9E communicating with the air chambers 6A to 6E from the air supply pipe 3 to the air chambers 9A to 9E.
  • the diameters of the orifices 9A to 9E are such that when air is supplied into the air supply pipe 3 at a flow rate of 120 L / min, the air chamber located at a lower position has a higher internal pressure, and between adjacent air chambers.
  • the pressure difference was adjusted to about 100 mmAq (about 981 Pa).
  • the diameter of the orifice 9A is 2.4 mm
  • the diameter of the orifice 9B is 2.5 mm
  • the diameter of the orifice 9C is 2.7 mm
  • the diameter of the orifice 9D is 3.0 mm
  • the diameter of the orifice 9E is 3.5 mm.
  • the dust cylinder 1 was installed in the aeration tank in a vertically placed state in which the axial direction is the vertical direction. After the aeration tank is filled with water, air is supplied at a flow rate of 120 L / min into the air supply pipe 3 through the header pipe connected to the opening 12 at the upper end of the air supply pipe 3. It was confirmed that fine bubbles were released almost uniformly over the period.
  • a cylindrical sintered body (length: 500 mm, outer diameter 75 mm, inner diameter 45 mm, average pore diameter 200 ⁇ m) made of ceramics with one end closed and the other end opened was prepared as a powder cylinder.
  • This dust cylinder was installed in the aeration tank in a vertically placed state in which the axial direction was the vertical direction. After filling the aeration tank with water, air was supplied into the dust cylinder at a flow rate of 120 L / min through a header pipe connected to the upper end opening of the dust cylinder. Many fine bubbles appeared from the upper half of the dust cylinder. Was released, but almost no fine bubbles were released from the lower half of the scattering cylinder.
  • Air supply pipe 4 (4A to 4K): Air diffuser member 5 (5A to 5Q): Partition plate 6 (6A to 6K): Air chamber 7: Hole 8: Socket 9 (9A to 9K): Orifice 10: Packing 11: Plug 12: Opening 15: Draft tube 16: Header pipe 17: Impeller 21: Diesel cylinder 22 (22A-22C): Dilute cylinder divided body 23: Air supply pipe 24 (24A to 24C): outer cylindrical body 25 (25A to 25C): inner cylindrical body 26 (26A to 26D): partition plate 27 (27A to 27C): air chamber 28: hole 29 (29A) 29C): Orifice 30: Spacer 32: Opening

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

L'invention porte sur un tube de diffuseur vertical, dans lequel tube la direction axiale de celui-ci est la direction verticale. Le tube de diffuseur comporte : une pluralité de sections divisées de tube de diffuseur ayant chacune une chambre à air divisée en un élément de diffusion cylindrique obtenu à partir d'un matériau poreux, une plaque de séparation de côté supérieur pour sceller hermétiquement une ouverture de côté supérieur et une extrémité supérieure de l'élément de diffusion d'une manière étanche vis-à-vis de l'air, et une plaque de séparation de côté inférieur pour sceller hermétiquement une ouverture de côté inférieur et une extrémité inférieure de l'élément de diffusion d'une manière étanche vis-à-vis de l'air ; et un tube d'alimentation en air pour relier la pluralité de sections divisées de tube de diffuseur dans une direction verticale par passage à travers au moins l'une soit de la plaque de division de côté supérieur soit de la plaque de division de côté inférieur dans chaque section divisée de corps de diffuseur. La section du tube d'alimentation en air située dans chaque chambre à air comporte au moins un orifice passant à partir de l'intérieur du tube d'alimentation en air dans la chambre à air, et le diamètre des orifices reliés aux chambres à air augmente de taille lorsque l'emplacement de ceux-ci devient plus bas. Ce tube de diffuseur peut être installé même dans un espace étroit, et peut décharger uniformément des microbulles à partir de la totalité du tube de diffuseur.
PCT/JP2011/078357 2010-12-15 2011-12-07 Tube de diffuseur WO2012081481A1 (fr)

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JP2010279036A JP5604282B2 (ja) 2010-12-15 2010-12-15 散気筒

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Cited By (2)

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WO2015142881A1 (fr) * 2014-03-17 2015-09-24 Biogen Ma Inc. Dispositifs de distribution de gaz, et systèmes et procédés associés
CN111375323A (zh) * 2018-12-28 2020-07-07 中国石油天然气股份有限公司 挡板式发泡器

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JP6345546B2 (ja) * 2014-09-02 2018-06-20 メタウォーター株式会社 省動力型曝気撹拌装置
JP6534542B2 (ja) * 2015-03-12 2019-06-26 佐竹化学機械工業株式会社 曝気撹拌装置
WO2017221346A1 (fr) * 2016-06-22 2017-12-28 佐竹化学機械工業株式会社 Agitateur d'aération
JP6759811B2 (ja) * 2016-07-28 2020-09-23 トヨタ紡織株式会社 マイクロバブル発生装置及びこれを備える冷却水循環システム

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JP2010167329A (ja) * 2009-01-20 2010-08-05 Hitachi Plant Technologies Ltd 曝気攪拌装置
JP2010194425A (ja) * 2009-02-24 2010-09-09 Ebara Corp 散気装置及び気泡発生装置

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JP2002248489A (ja) * 2001-02-26 2002-09-03 Mitsui Miike Mach Co Ltd 軸流撹拌機の空気吹出装置
JP2007181753A (ja) * 2006-01-04 2007-07-19 Osaki Electric Co Ltd 曝気装置
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WO2015142881A1 (fr) * 2014-03-17 2015-09-24 Biogen Ma Inc. Dispositifs de distribution de gaz, et systèmes et procédés associés
US10023831B2 (en) 2014-03-17 2018-07-17 Biogen Ma Inc. Gas delivery devices and associated systems and methods
CN111375323A (zh) * 2018-12-28 2020-07-07 中国石油天然气股份有限公司 挡板式发泡器
CN111375323B (zh) * 2018-12-28 2022-02-25 中国石油天然气股份有限公司 挡板式发泡器

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