JP5604282B2 - Spiral cylinder - Google Patents

Description

  In the present invention, when organic wastewater such as sewage and industrial wastewater is aerobically purified by an activated sludge method or the like, air is supplied in the form of fine bubbles in water to be treated contained in an aeration tank. It is related with the scattering cylinder used to do.

  When organic wastewater such as sewage or industrial wastewater is aerobically purified by the activated sludge method or the like, a diffusion cylinder (diffuser) is installed in an aeration tank that accommodates the water to be treated. Generally, 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.

  By the way, as shown in, for example, Patent Document 1, a conventional spread cylinder is installed in a horizontally placed state in which the axial direction thereof is a horizontal direction, and thus there is a problem that a certain amount of installation space is required. For example, when a draft tube is installed in an aeration tank and a diffuser cylinder is installed in the draft tube, the inside diameter of the draft tube must be larger than the total length of the diffuser cylinder.

  As a means for solving such a problem of installation space, it is conceivable to install the scattering cylinder in a vertically placed state in which the axial direction thereof is the vertical direction. However, when the dust cylinders are installed in a vertically placed state, the surrounding water pressure increases from the top to the bottom of the dust cylinder. For this reason, a difference occurs in the surrounding water pressure between the upper part and the lower part of the scattering cylinder, and a new problem arises due to this water pressure difference.

  That is, 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. In the lower part of the dust cylinder where the surrounding water pressure is high, 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.

Japanese Utility Model Publication No. 3-19600

  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.

  In order to achieve the above object, according to the present invention, the following dust cylinder is provided.

[1] 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 an upper end portion and an 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. In addition, 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).

[2] Any two or more of the plurality of divided cylinder divisions connected in the vertical direction by the air supply pipe are closely arranged, and the lower part of the divided cylinder division located above the lower division division body The split cylinder according to [1], wherein the side partition plate and the upper partition plate of the split cylinder division body in close contact with the side partition plate are a common single partition plate.

[3] The air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction thereof, and is located in each air chamber among the plurality of orifices and has a desired diameter. The blow cylinder according to [1] or [2], which is used in a state in which an orifice other than the orifice having a closed position is used.

[4] The dust cylinder according to any one of [1] to [3], wherein the porous material is ceramics.

[5] A cylindrical cylinder whose axial direction is the vertical direction, an outer cylindrical body, an inner cylindrical body made of a porous material disposed at a predetermined interval inside the outer cylindrical body, 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 lower opening formed between the partition plate, the lower end of the outer cylindrical body, the lower end of the inner cylindrical body, and the lower end of the outer cylindrical body and the lower 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 to the air chamber is provided in each of the air chambers, and the orifice communicates with the air chamber located below. A large-diameter cylinder (second cylinder).

[6] Any two or more of the plurality of divided cylinder divisions connected in the vertical direction by the air supply pipe are closely arranged, and the lower part of the divided cylinder division located above The split cylinder according to [5], wherein the side partition plate and the upper partition plate of the split cylinder division body in close contact with the side partition plate are a common single partition plate.

[7] The air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction thereof, is located in each air chamber among the plurality of orifices, and has a desired diameter. The powder cylinder according to [5] or [6], which is used in a state where an orifice other than an orifice having a closed position is used.

[8] The dust cylinder according to any one of [5] to [7], wherein the porous material is ceramics.

  In the present invention, “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. Further, in the present invention, “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.

  Furthermore, in the present invention, 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. For example, in addition to ceramics and synthetic resin, it may be made of a cloth in which fine holes are formed. Here, the term “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 μm, a width of about 50 to 500 μm, and a length of 0.5 to 2. It refers to a slit of about 0 mm. In the present invention, “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.

  Furthermore, 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. For example, 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.

  Since 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.

It is explanatory drawing which shows an example of embodiment of the 1st dust cylinder of this invention. It is a perspective view which shows an example of the partition plate used for the 1st dust cylinder of this invention. It is explanatory drawing which shows another example of embodiment of the 1st dust cylinder of this invention. It is explanatory drawing which shows another example of embodiment of the 1st dust cylinder of this invention. It is explanatory drawing which shows an example of the air supply pipe | tube used for the 1st dust cylinder of this invention. It is explanatory drawing which shows the example of installation at the time of installing the 1st diffuser cylinder of this invention in the draft tube installed in the aeration tank. It is explanatory drawing which shows an example of embodiment of the 2nd dispersion cylinder of this invention. It is a perspective view which shows an example of the partition plate used for the 2nd dust cylinder of this invention. It is explanatory drawing which shows an example of the method of hold | maintaining the space | interval between an outer side cylindrical body and an inner side cylindrical body in the 2nd dispersion cylinder of this invention. 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.

  Hereinafter, the present invention will be described based on specific embodiments, but the present invention should not be construed as being limited thereto, and based on the knowledge of those skilled in the art without departing from the scope of the present invention. Various changes, modifications, and improvements can be added.

  FIG. 1 is an explanatory diagram showing an example of an embodiment of a first dust cylinder of the present invention. In FIG. 1, in order to make the internal structure of the diffusion cylinder 1 easier to understand, some members such as the aeration member 4 are drawn in cross section.

  As shown in FIG. 1, 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 (2 </ b> A to 2 </ b> A) as its constituent elements. 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 air diffusion members 4A to 4E. Have. In the example of FIG. 1, a plurality of split cylinder divisions 2 </ b> A to 2 </ b> E are arranged in close contact with each other. The upper partition plate of the body is a common single partition plate. Specifically, 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. Similarly, 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. And 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.

  As a porous material constituting the diffuser member 4 (4A to 4E), a material used in a conventional diffuser cylinder, for example, ceramics, porous resin, etc. can be used, and in particular, 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. Although there is no restriction | limiting in particular also about the pore diameter of the diffuser member 4, From a viewpoint of making the microbubble of the size which is easy to dissolve in to-be-processed water, it is preferable to set it as a pore diameter of about 50-500 micrometers. In addition, 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.

  In the present embodiment, as shown in FIG. 2, the partition plate 5 (5A to 5F) has a hole 7 for penetrating the air supply pipe in the vicinity of the center, and the hole 7 has a cylindrical shape. However, a plate-like partition plate having no such socket 8 may be used. As a material of the partition plate 5, stainless steel (for example, SUS304) or the like can be suitably used from the viewpoint of strength, workability, and the like. Between the partition plate 5 (5A to 5E) and the air diffuser 4, a packing 10 made of chloroprene rubber, foamed polyurethane or the like is disposed to improve airtightness in order to prevent air leakage when the diffuser cylinder 1 is used. It is preferable.

  The air supply pipe 3 penetrates 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. In portions of the air supply pipe 3 located in the air chambers 6A to 6E, 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. In the present embodiment, 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. As a material of the air supply pipe 3, stainless steel (for example, SUS304) or the like can be suitably used from the viewpoint of strength, workability, and the like.

  When the dust cylinder 1 is used, the air supplied from the opening 12 at the upper end of the air supply pipe 5 into the air supply pipe 3 first moves to the air chambers 6A to 6E through the orifices 9A to 9E. And by the rise in the pressure inside each air chamber 6A-6E, it foams through the pores of the air diffusers 4A-4E facing each air chamber 6A-6E, and becomes a micro-sized fine bubble. Released into the water to be treated.

  As described above, when the dust cylinder is installed in a vertically placed state in which the axial direction thereof is the vertical direction, the surrounding water pressure increases from the top to the bottom 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.

  Therefore, in the cylindrical cylinder 1 of the present invention, 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. When the diameters of the orifices 9A to 9E communicating with the air chambers 6A to 6E are adjusted in this way, the air chamber 6 located at a lower position has a higher internal pressure, the surrounding water pressure is high, and fine bubbles are not easily released. Also in the lower part of the dust cylinder 1, it is possible to discharge the fine bubbles of the same amount as the upper part of the dust cylinder 1 having a low surrounding water pressure. As a result, the entire dust cylinder 1 can be effectively used for foaming fine bubbles, and high foaming efficiency can be obtained.

  In the embodiment shown in FIG. 1, five split cylinder divisions 2 </ b> A to 2 </ b> E 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. First, in the dispersion cylinder 1 of FIG. 3, a plurality of dispersion cylinder division bodies 2 (2F to 2H) are provided. Are closely spaced and spaced apart. When the plurality of split cylinder divisions 2 are arranged at such intervals, 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. 3, 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 and the upper partition plate 5J of the split cylinder divided body 2H are separate bodies. 3 is provided with three air chambers 6 (6F to 6H).

  Further, in the diffuser cylinder 1 of FIG. 3, 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 from each other. Has been. Further, 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. Furthermore, in the dust cylinder 1 of FIG. 3, 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 divided body 2H is not penetrated by the air supply pipe 3 as described above, it penetrates 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 described above. First, in the dispersion cylinder 1 of FIG. 4, a plurality of dispersion cylinder division bodies 2 (2I to 2K) are provided. Among these, some of the split cylinder divisions 2I and 2J are closely arranged, and the remaining split cylinder divisions 2K are arranged at intervals. For this reason, the lower partition plate of the split cylinder division 2I and the upper partition plate of the split cylinder division 2J in close contact with the lower partition plate 2I constitute a common single partition plate 5H. 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 split cylinder of the present invention can obtain the same effects as those of the embodiment shown in FIG. 1 even when the configuration of the embodiment shown in FIGS. 3 and 4 is used. In the first dust cylinder of the present invention, as shown in FIG. 5, the air supply pipe 3 is originally provided with a plurality of orifices 9 having different diameters along the axial direction. Among the orifices 9, the orifices other than those having the desired diameter (black orifices in FIG. 5) located in the air chambers 6 are used in a closed state. preferable. In this way, 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. Thus, the manufacturing efficiency of the scattering cylinder can be increased.

  FIG. 6 is an explanatory view 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. When a plurality of the first dust cylinders of the present invention are installed in the draft tube 15, 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. In this way, 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.

  In the example of FIG. 6, 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. In FIG. 7, 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.

  As shown in FIG. 7, the second blow cylinder 21 of the present invention is a vertical type blow cylinder whose axial direction is the vertical direction, and includes a plurality of blow cylinder divisions 22 (22A to 22A to 22B) as constituent elements thereof. 22C) and an air supply pipe 3.

  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. Air chamber partitioned by a ring-shaped partition plate (lower partition plate) that hermetically closes the lower opening formed between the lower end of -24C and the lower ends of the inner cylindrical bodies 25A-25C 27 (27A-27C). In the example of FIG. 7, the plurality of split cylinder divisions 22A to 22C are arranged in close contact with each other, the lower partition plate of the split cylinder division located above and the split cylinder division close to the lower side. The upper partition plate of the body is a common single partition plate. Specifically, 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. Similarly, 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.

  As the porous material constituting the inner cylindrical body 25 (25A to 25C), materials used in conventional powder cylinders, for example, ceramics, porous resins, and 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. Although there is no restriction | limiting in particular also about the pore diameter of the inner side cylindrical body 25, From a viewpoint of foaming the microbubble of the size which is easy to dissolve in to-be-processed water, it is preferable to set it as a pore diameter of about 50-500 micrometers.

  The material constituting the outer cylindrical body 24 (24A to 24C) may be a porous material as in the case of the inner cylindrical body 25, or may be a non-porous material. When only 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. When the outer peripheral surface of the outer cylindrical body 24 is also desired to be a diffused surface, 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.

  In this embodiment, as shown in FIG. 8, 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. As a material of the partition plate 26 (26A to 26D), stainless steel (for example, SUS304) or the like can be suitably used from the viewpoint of strength, workability, and the like. Between the partition plate 26 and the outer cylindrical body 24 and the inner cylindrical body 25, 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.

  For example, as shown in FIG. 9, 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 penetrates 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. In the example of FIG. 7, 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. In portions of the air supply pipe 23 located in the air chambers 27A to 27C, orifices 29A to 29C leading 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. In the present embodiment, 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. As a material of the air supply pipe 23, stainless steel (for example, SUS304) or the like can be suitably used from the viewpoint of strength, workability, and the like.

  When the dust cylinder 21 is used, the air supplied from the opening 32 at the upper end of the air supply pipe 5 into the air supply pipe 23 first moves to the air chambers 27A to 27C through the orifices 29A to 29C. And by the rise of the pressure inside each air chamber 27A-27C, the air holes 27A-25C facing the air chambers 27A-27C (the outer cylindrical bodies 24A-24C are also made of a porous material). 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.

  As described above, when the dust cylinder is installed in a vertically placed state in which the axial direction thereof is the vertical direction, the surrounding water pressure increases from the top to the bottom 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.

  Therefore, in the cylindrical cylinder 21 of the present invention, 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. Note that 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. When the diameters of the orifices 29A to 29C communicating with the air chambers 27A to 27C are adjusted in this way, the air chamber 27 located at a lower position has a higher internal pressure, and the surrounding water pressure is high, so that fine bubbles are not easily released. Also in the lower part of the dust cylinder 21, it is possible to discharge the fine bubbles of the same amount as the upper part of the dust cylinder 21 where the surrounding water pressure is low. As a result, the entire scattering cylinder 21 can be effectively used for foaming of fine bubbles, and high foaming efficiency can be obtained.

  In the embodiment shown in FIG. 7, three split cylinder divisions 22 </ b> A to 22 </ b> C 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.

  Further, in 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. Further, as shown in FIG. 10, 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. Also in the second cylinder of the present invention, similarly to the first cylinder of the present invention, the air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction. Of these plural orifices, it is preferable that 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. When a plurality of the second dust cylinders 21 of the present invention are installed in the draft tube 15, 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. Thus, 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.

  In the example of FIG. 11, 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. In the example of FIG. 11, 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.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.

(Example)
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 μm) 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: 38 mm) in a hole of a disc (diameter: 85 mm, thickness: 3 mm) having a hole in the center. , 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. As the air supply pipe 3, a circular pipe made of SUS304 (length: 550 mm, outer diameter 34 mm, inner diameter 28 mm) having a lower end closed with a plug 11 was used. The air supply pipe 3 is provided with two orifices 9A to 9E communicating with the air chambers 9A to 9E from the air supply pipe 3 to the air chambers 6A to 6E.

  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). Specifically, 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, and the diameter of the orifice 9E is 3.5 mm. By doing so, the pressure relationship as described above was realized.

  This dust cylinder 1 was installed in the aeration tank in a vertically placed state in which the axial direction thereof 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.

(Comparative example)
A cylindrical sintered body (length: 500 mm, outer diameter 75 mm, inner diameter 45 mm, average pore diameter 200 μm) 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 and supplying air at a flow rate of 120 L / min through the header pipe connected to the opening at the upper end of the dust cylinder, a large number of fine bubbles are generated 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.

  In the present invention, when organic wastewater such as sewage and industrial wastewater is aerobically purified by an activated sludge method or the like, air is supplied in the form of fine bubbles in water to be treated contained in an aeration tank. Therefore, it can be used suitably as a scattering cylinder.

1: Spread cylinder 2 (2A to 2K): Split cylinder divided body 3: 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: Spiral cylinder 22 (22A-22C): Spiral cylinder divided body 23: Air supply pipe 24 (24A-24C): Outer cylindrical body 25 (25A-25C): Inner cylindrical body 26 (26A-26D): Partition plate 27 (27A-27C): Air chamber 28: Hole 29 (29A) ~ 29C): Orifice 30: Spacer

Claims (8)

A cylindrical cylinder whose axial direction is the vertical direction,
A cylindrical air diffusion member made of a porous material, an upper partition plate that hermetically closes an upper end portion and an upper opening portion of the air diffusion member, and a lower end portion and a lower opening portion of the air diffusion member are airtight A plurality of split cylinder divisions having an air chamber partitioned by a lower partition plate to be closed, and
An air supply pipe that passes through at least one of the upper partition plate and the lower partition plate of each of the above-mentioned divided cylinder divisions and connects the plurality of divided cylinder divisions 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 in a portion of the air supply pipe located in each air chamber,
A diffuse cylinder in which the diameter of the orifice increases as the orifice communicates with the air chamber located below.   Any two or more of the plurality of divided cylinder divisions connected in the vertical direction by the air supply pipe are closely arranged, and the lower partition plate of the divided cylinder division located above the lower division plate 2 and the above-mentioned upper partition plate of the split-cylinder divided body in close contact therewith is a common single partition plate.   The air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction, and the orifice is located in each air chamber among the plurality of orifices and has a desired diameter. The dust cylinder according to claim 1 or 2, wherein the other cylinder is used in a state in which an orifice other than the above is closed.   The dust cylinder according to any one of claims 1 to 3, wherein the porous material is ceramics. 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, an upper end portion of the outer cylindrical body, an upper end portion of the inner cylindrical body, and the outer cylinder A ring-shaped upper partition plate that hermetically closes an upper opening formed between an upper end portion of the cylindrical body and an upper end portion of the inner cylindrical body, a lower end portion of the outer cylindrical body, and the inner cylindrical shape And a ring-shaped lower partition plate that hermetically closes the lower opening formed between the lower end of the body and the lower end of the outer cylindrical body and the lower end of the inner cylindrical body. A plurality of split cylinder divisions having an air chamber, and
An air supply pipe that passes through at least one of the upper partition plate and the lower partition plate of each of the above-mentioned divided cylinder divisions and connects the plurality of divided cylinder divisions 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 in a portion of the air supply pipe located in each air chamber,
A diffuse cylinder in which the diameter of the orifice increases as the orifice communicates with the air chamber located below.   Any two or more of the plurality of divided cylinder divisions connected in the vertical direction by the air supply pipe are closely arranged, and the lower partition plate of the divided cylinder division located above the lower division plate The split cylinder according to claim 5, wherein the upper partition plate of the split cylinder divided body in close contact therewith is a common single partition plate.   The air supply pipe is originally provided with a plurality of orifices having different diameters along the axial direction, and the orifice is located in each air chamber among the plurality of orifices and has a desired diameter. The dust cylinder according to claim 5 or 6, which is used in a state in which an orifice other than the above is closed.   The dust cylinder according to any one of claims 5 to 7, wherein the porous material is ceramics.

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