JP5275082B2 - Air diffuser and submerged membrane unit - Google Patents

Abstract

The utility model relates to a gas dispersing device and an impregnated membrane unit. By greatly decreasing the burden of maintenance operation, the device can prevent the gas dispersing pipe from blocking, and decrease the replacement frequency of the impregnated separating membrane. The gas dispersing device comprises a base and a gas dispersing pipe, wherein the base is used for supporting hollow fibrous membranes, and is provided with a gas flow passage; the gas dispersing pipe can be freely installed relative to the detachment of the base, and is communicated with the gas flow passage when arranged on the base. By detaching the detachable gas dispersing pipe, the deposits are removed, or the new gas dispersing pipe is replaced. During installation, the gas dispersing pipe is only arranged relative to the base, and then the structure for communicating the gas flow passage and the gas dispersing pipe is formed, so the detachment operation is easy. As the structure of arranging the gas dispersing pipe relative to the base supporting the hollow fibrous membranes, the alignment between the hollow fibrous membranes and the gas dispersing hole of the gas dispersing pipe can be completed through the alignment operation between the gas dispersing pipe and the base during installation.

Description

  The present invention relates to an air diffuser and an immersion membrane unit.

  In a submerged membrane unit having an air diffuser disposed below the separation membrane, when the diffuser of the air diffusion tube is clogged due to long-term use, the membrane surface deposit is reduced by the movement of the separation membrane being reduced. As a result, there has been a problem in that the amount of removal of the separation membrane decreases, which increases the frequency of replacement of the separation membrane.

  Therefore, as a conventional diffuser and an immersion membrane unit, the diffuser tube is washed by flowing water into the diffuser tube (see, for example, Patent Document 1), or the diffuser tube is fed by pumping air to the diffuser tube. There are known ones that suppress clogging (for example, see Patent Document 2) and those that adjust the cross-sectional area and opening area of a tube so that clogging is difficult to occur (for example, see Patent Document 3).

JP 2002-186990 A JP-A-7-251042 JP 2000-107771 A

  However, in the above-described air diffuser, for example, in the case of flowing water through the air diffuser or pumping air, deposits adhering in the air diffuser can be removed to some extent, but the removal effect is not sufficient. Therefore, the air diffuser may become clogged as a result of the passage of time. Further, if the cross-sectional area and the opening area are adjusted so that clogging is difficult, clogging is less likely to occur, but the diffuser tube may also clog over time. If clogging occurs, disassemble the entire submerged membrane unit, remove the diffuser tube, clean or replace it, and do not reassemble the entire submerged membrane unit or align the diffuser holes of the diffuser tube with the separation membrane. Must not. As described above, the conventional air diffuser has a problem that the load of maintenance work on the submerged membrane unit due to clogging of the air diffuser tube becomes very large.

  The present invention has been made to solve such problems, and by greatly reducing the load of maintenance work, the clogging of the diffuser tube is prevented and the replacement frequency of the submerged separation membrane is reduced. An object of the present invention is to provide an air diffuser and a submerged membrane unit.

An air diffuser according to the present invention is an air diffuser that is installed below a submerged separation membrane installed in a tank and diffuses gas to the submerged separation membrane. while supporting, with a pedestal a gas flow path for supplying the gas is provided, and sparge tube which communicates with the gas flow path when Mounting against the pedestal, the pedestal is diffusing pipe is inserted An internal space , a wall provided between the gas flow path and the internal space, an insertion hole formed by penetrating the wall in the mounting direction, and communicating the internal space and the gas flow path, The air diffuser is provided with an insertion portion that is inserted into the insertion hole at the time of attachment and in which the internal flow path of the air diffuser is opened at the tip. Moreover, the immersion membrane unit which concerns on this invention is equipped with such a diffuser and an immersion type separation membrane, It is characterized by the above-mentioned.
Moreover, you may attach the diffuser tube which concerns on this invention so that attachment or detachment is possible with respect to a base.

According to the air diffuser and a submerged membrane unit, only attaching the sparge tube relative to the base seat, since the diffusing pipe and the gas flow paths are configured to communicate, when removing the aeration tube is diffusing pipe It is not necessary to disassemble the air supply pipe and the air supply pipe, and it is not necessary to perform an operation of connecting the air diffusion pipe and the air supply pipe at the time of attachment. Further, since the diffuser tube is attached to the pedestal supporting the submerged separation membrane, if the alignment between the submerged separation membrane and the pedestal is performed, the diffuser tube is attached at the time of attachment. The alignment between the submerged separation membrane and the air diffuser of the air diffuser is completed by simply performing the operation of aligning between the pedestal and the pedestal. As described above, it is possible to significantly reduce the load of maintenance work, thereby preventing clogging of the diffuser tube and reducing the replacement frequency of the submerged separation membrane. Moreover, when attaching a diffuser tube, air can be supplied into a diffuser tube by a simple operation | work which only inserts an insertion part in an insertion hole.
Further, according to the configuration in which the diffuser tube is detachably attached to the pedestal, when the usage time has elapsed, only the removable diffuser tube is removed, and the deposit is cleaned by cleaning only the diffuser tube, or It can be replaced with a new diffuser.

Further, in the air diffuser according to the present invention, the air diffuser has air diffuser holes, the pedestal has a membrane arrangement hole formed on the upper surface side for disposing the immersion type separation membrane, and the air diffuser is attached to the pedestal. When the diffuser tube and the gas flow path are communicated with each other, it is preferable that the diffuser holes are arranged at the positions of the membrane arrangement holes. This makes it possible to air diffusion in the work only from the proper position air immersion type separation membrane through the membrane arrangement hole from diffusing pores inserting a diffusing pipe to the internal space.

  In the air diffuser according to the present invention, it is preferable that the wall portion aligns the diffuser tube in the mounting direction, and the insertion hole aligns the diffuser tube in the direction orthogonal to the mounting direction. Therefore, when attaching the diffuser tube, the diffuser tube can be positioned by a simple operation of inserting the insertion portion into the insertion hole and receiving the diffuser tube with the wall portion.

  According to the present invention, by greatly reducing the load of maintenance work, clogging of the diffuser tube can be prevented and the replacement frequency of the submerged separation membrane can be reduced.

It is a front view which shows the structure of the diffuser which concerns on embodiment, and an immersion film unit provided with the same. It is sectional drawing of the hollow fiber membrane module and aeration apparatus which are shown in FIG. It is a perspective view which shows the structure of the diffuser which concerns on embodiment, and is a figure which shows the state which removed the diffuser tube from the base. It is sectional drawing along the IV-IV line shown in FIG. 3, and is a figure which shows the state which attached the diffuser tube to the base. It is sectional drawing along the VV line shown in FIG. It is sectional drawing which shows the structure of the diffuser which concerns on a modification. It is sectional drawing which shows the structure of the diffuser which concerns on a modification.

  Hereinafter, embodiments of an air diffuser and an immersion membrane unit according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view showing a configuration of an air diffuser 2 according to this embodiment and an immersion membrane unit 1 including the same. FIG. 2 is a cross-sectional view of the immersion membrane unit 1 and the air diffuser 2 shown in FIG. The immersion membrane unit 1 has a function of removing sludge from the treated water by immersing it in the treated water in the treatment tank, and as shown in FIG. 1, a hollow fiber membrane module 3 that purifies the treated water, An air diffuser 2 provided below the hollow fiber membrane module 3 to support the hollow fiber membrane module 3 and diffuse to the hollow fiber membrane module 3, and a hollow fiber membrane module provided above the hollow fiber membrane module 3 3 and a liquid collection header 4 for sucking out filtered water 3.

  In the present embodiment, the immersion membrane unit 1 is a unit in which four hollow fiber membrane modules 3 are integrated into a rectangular frame 6 made of a column beam. The installation interval between the hollow fiber membrane modules 3 incorporated in the frame 6 is not less than 1.2 times the outer diameter of the hollow fiber membrane module 3 in consideration of shaking of the plurality of hollow fiber membranes 3a in the treated water, and 2 It is preferable to set to about twice or less. For example, the pitch between the hollow fiber membrane modules 3 is preferably about 250 mm or more and 300 mm or less. When the hollow fiber membrane modules 3 are too close to each other, the adjacent hollow fiber membranes 3a may collide with each other and the hollow fiber membranes 3a may be rubbed. Moreover, since the width of the swing of the hollow fiber membrane 3a is suppressed and the effect of suppressing sludge adhesion may be impaired, the installation interval between the hollow fiber membrane modules 3 is 1. It is preferable to set it to 2 times or more, preferably about 1.5 times or more. Note that the frame 6 is made of a pipe material as a strength member, and is used as a reinforcing material by giving a strength by bending a plate material. The frame 6 is preferably made of super stainless steel for the plate material and the pipe so as to cope with the case where the treated water is seawater.

  The hollow fiber membrane module 3 includes a plurality of hollow fiber membranes 3a, a binding portion 7 for binding the plurality of hollow fiber membranes 3a on the lower side, a skirt portion 8 attached to the binding portion 7, and a plurality of hollow fiber membranes 3a. And a cap member 11 attached to the upper end side of the bundling portion 9.

  The hollow fiber membrane 3a has a tube shape in which a flow path of treated water is formed inside, and its wall surface is a filtration membrane for filtering the treated water. Sludge can be removed. The binding part 7 is a disk-like member fixed to the lower end of the hollow fiber membrane 3a. The opening portion on the lower end side of the hollow fiber membrane 3 a is sealed by the upper surface of the binding portion 7. The bundling portion 7 has a plurality of through holes 7a formed at positions other than the position where the hollow fiber membrane 3a is fixed in order to allow the aerated air from the diffuser 2 disposed below to pass upward. Yes. The skirt portion 8 is a cylindrical member in which the binding portion 7 is fitted on the upper end side. The lower end side of the skirt portion 8 is fitted into a concave portion 17 of the air diffuser 2 described later. Thereby, the skirt part 8 can fix the plurality of hollow fiber membranes 3a and the air diffusers 2 so as not to let the air from the air diffuser 2 escape.

  The binding portion 9 on the upper end side of the hollow fiber membrane module 3 has a plurality of through holes 9a, and the hollow fiber membrane 3a is supported by inserting the upper end portion of the hollow fiber membrane 3a into the through holes 9a. It is a member to do. The cap member 11 is a hollow frustoconical member, and the binding portion 9 is inserted into the lower end portion thereof.

  The air diffuser 2 supports the hollow fiber membrane module 3 and is provided with a pedestal 12 provided with a gas flow path for supplying air and an air diffuser hole 13a for diffusing air. The diffusing tube 13 is detachably mounted and communicated with the gas flow path at the time of mounting. Since the gas flow path of the pedestal 12 is connected to an air supply pipe 14 connected to an external air supply apparatus (not shown), the air supplied from the air supply apparatus passes through the gas flow path and the air diffusion pipe 13. Released from the air diffuser 13a. In addition, a circular film arrangement hole 15 is formed in the upper surface wall of the pedestal 12, and a cylindrical recess 17 surrounding the film arrangement hole 15 and recessed downward is formed. The pedestal 12 supports the hollow fiber membrane module 3 by inserting the skirt portion 8 into the inner peripheral surface of the concave portion 17. The detailed configuration of the air diffuser 2 will be described later.

  The liquid collection header 4 has a function of sucking the treated water in the treatment tank through the hollow fiber membrane 3a, and has a function of collecting the filtered water filtered by the hollow fiber membrane 3a. The liquid collection header 4 is connected to the upper end portion of the cap member 11 of the hollow fiber membrane module 3 through a joint 16 bent by 90 degrees.

  In the immersion membrane unit 1 configured as described above, the treated water W is sucked up in a state where the treated water W is filtered through the plurality of hollow fiber membranes 3a and the sludge is removed by sucking the treated water W with the liquid collection header 4. The liquid is collected by the liquid collection header 4. On the other hand, the air diffused from the diffuser holes 13a of the diffuser tube 13 floats upward, passes through the through holes 7a of the binding portion 7, and passes around the plurality of hollow fiber membranes 3a. At this time, the hollow fiber membrane 3a is shaken by the influence of the diffused air, so that the deposits deposited on the membrane surface are shaken off. Further, the upward flow of air stirs and mixes the liquid mixture in the tank, supplies oxygen for biological treatment, and acts as a sweep on the membrane surface of the hollow fiber membrane 3a to clean the membrane surface.

  Next, the configuration of the air diffusion device 2 according to the present embodiment will be described in detail with reference to FIGS. FIG. 3 is a perspective view showing a configuration of the air diffusing device 2 according to the present embodiment, and shows a state where the air diffusing tube 13 is removed from the pedestal 12. FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. 3 and shows a state in which the air diffuser 13 is attached to the base 12. FIG. 5 is a cross-sectional view taken along line VV shown in FIG. 4, (a) shows a state before the air diffuser 13 is attached, and (b) shows a state when the air diffuser 13 is attached. . In the following description, a direction in which the front surface 12a and the back surface 12b of the base 12 formed in a rectangular flat plate shape face each other is referred to as an attachment direction (indicated by an arrow D in FIG. 3).

  As shown in FIGS. 3 and 4, the air diffuser 13 includes two pipes 31 and 32 arranged in parallel, and a rectangular plate-shaped handle member that connects the pipes 31 and 32 to each other at one end of the pipes 31 and 32. 33, a rectangular plate-shaped guided member 34 that connects both the tubes 31 and 32 so that their distal ends protrude at the other end of the tubes 31 and 32, and a tube that connects the tubes 31 and 32 to each other 36.

  The pipe 31 is constituted by a pipe extending linearly, and the internal gas flow path 31a is sealed by a handle member 33 at the rear end, and is opened at the front end 31b on the base 12 side. The distal end 31b side is an insertion portion 31c that is inserted into an insertion hole 28 formed in the inner wall 22 of the inner space 22 of the pedestal 12 when the air diffuser 13 is attached, and on the outer peripheral surface side of the distal end portion. The taper is formed so as to be tapered. The tube 31 is formed with two diffuser holes 13 a penetrating downward in the longitudinal direction of the tube 31. The diffuser holes 13a penetrating downward are preferable because the entry of water into the diffuser tube 13 is prevented. The pipe 32 arranged adjacent to the pipe 31 in the horizontal direction orthogonal to the longitudinal direction of the pipe 31 is constituted by a pipe extending linearly, and the internal flow path 32a is sealed by the handle member 33 on the rear end side. And open on the tip 32b side. Further, the distal end 32b side is an insertion portion 32c that is inserted into an insertion hole 29 formed in the inner wall 22 of the inner space 22 of the pedestal 12 when the air diffuser 13 is attached, and on the outer peripheral surface side of the distal end portion. The taper is formed so as to be tapered. The tube 32 is formed with two diffuser holes 13 a penetrating downward in the longitudinal direction of the tube 32. The diffuser holes 13a penetrating downward are preferable because the entry of water into the diffuser tube 13 is prevented. The pipe 36 is configured by a pipe extending linearly from the pipe 31 toward the pipe 32, and is disposed between the two air diffusion holes 13 a of the pipes 31 and 32.

  The handle member 33 is a rectangular plate-like member extending in the horizontal direction perpendicular to the longitudinal direction of the tubes 31 and 32, and the side surface is connected to the rear ends of the tubes 31 and 32. In addition, the length of the handle member 33 is longer than the distance between the pipe 31 and the pipe 32, and has a portion that protrudes outward from the pipe 31 and the pipe 32 at both ends. The portion functions as guided portions 33 a and 33 b with respect to the guide portion of the base 12. The guided member 34 is a rectangular plate-like member extending in the horizontal direction perpendicular to the longitudinal direction of the pipes 31 and 32, and the pipes 31 and 32 are inserted through the side surfaces thereof. It arrange | positions between 31c and 32c and the diffuser hole 13a. The guided member 34 is longer than the distance between the tube 31 and the tube 32, and has a portion that protrudes outward from the tube 31 and the tube 32 at both ends, and this protruding portion is the portion of the base 12. It functions as guided portions 34a and 34b with respect to the guide portion.

  A ring-shaped packing 37 is attached to the insertion portion 31c. The rear surface of the packing 37 is in contact with the side surface of the guided member 34. A ring-shaped packing 38 is also attached to the insertion portion 32c. The rear surface of the packing 38 is in contact with the side surface of the guided member 34.

  The pedestal 12 of the air diffuser 2 is formed in a rectangular flat plate shape with resin. An internal space 22 is formed in the pedestal 12 by forming a rectangular hole having a size for fastening the substantially entire surface of the front surface 12a from the front surface 12a to the back surface 12b. The front surface 12a has an opening of the internal space 22 formed therein. A mounting opening 23 is formed. The size of the internal space 22 in the width direction is larger than the size of the handle member 33 and the guided member 34 of the air diffuser 13, and the depth is between the back surface of the handle member 33 and the front surfaces of the packings 37 and 38. The distance is greater than. The internal space 22 of the pedestal 12 extends to the back surface 12b side from the central position in the mounting direction D of the pedestal 12, and the inner wall surface of the internal space 22 is parallel to the front surface 12a and the back surface 12b. It is comprised as the receiving surface 22a which receives the to-be-guided member 34 at the time of attachment. The region between the receiving surface 22a and the back surface 12b is a thick wall surface.

  Membrane arrangement holes 15 for arranging the hollow fiber membrane modules 3 are formed in four places in the upper wall portion of the internal space 22 of the base 12 by penetrating upward from the internal space. Further, a cylindrical concave portion 17 is formed on the upper surface 12 e of the pedestal 12 so as to surround the film arrangement hole 15 and sink downward. The inner diameter of the concave portion 17 is substantially the same as the outer diameter of the skirt portion 8, so that the skirt portion 8 can be fitted. The center point of the film arrangement hole 15 is formed at a position that coincides with the center point of each of the four air diffusion holes 13 a when the air diffusion tube 13 is attached. It should be noted that, instead of the concave portion 17, a cylindrical socket portion protruding upward from the edge portion of the film arrangement hole 15 may be provided so as to be fitted on the inner peripheral side of the skirt portion 8. This is preferable because the skirt portion 8 can be attached without lifting and work efficiency is improved.

  A gas flow path 26 penetrating from the side surface 12c in the horizontal direction orthogonal to the mounting direction D to the side surface 12d on the opposite side is formed in the thick portion disposed on the side opposite to the mounting port 23 in the pedestal 12. . The gas flow path 26 has a circular cross section (see FIG. 5). A circular recess 26a is formed on the side surface 12c of the gas flow path 26, and the air supply pipe 14 is fitted in the recess 26a. Further, from the side surface 12d side of the gas flow path 26, a cylindrical convex portion 26b having the same outer diameter as the inner diameter of the concave portion 26a protrudes. A plurality of submerged membrane units 1 can be connected by fitting the convex portions 26 b into the concave portions 26 a of the other pedestals 12. The wall thickness region disposed between the gas flow path 26 and the internal space 22 is hereinafter referred to as a wall portion 27.

  The thickness of the wall portion 27 in the mounting direction D is larger than the lengths of the insertion portions 31c and 32c of the air diffusion tube 13. A side surface of the wall portion 27 on the inner space 22 side constitutes the above-described receiving surface 22 a and has a function of aligning the air diffuser 13 in the mounting direction D. Specifically, the receiving surface 22a of the wall portion 27 is formed so that the center point of the air diffusion hole 13a and the center of the membrane arrangement hole 15 are obtained when the air diffusion tube 13 is attached and the guided member 34 is received via the packings 37 and 38. The positions of the dots in the mounting direction D can be aligned so that they substantially coincide with each other.

  The wall portion 27 is formed with a pair of circular insertion holes 28 and 29 which are formed by penetrating in the mounting direction D and communicate with the internal space 22 and the gas flow path 26. The insertion holes 28 and 29 are formed at positions spaced apart from each other at equal intervals from the central position in the longitudinal direction of the receiving surface 22a toward the extending direction of the gas flow path 26, and the distance between them is as follows. The distance between the pipe 31 and the pipe 32 of the air diffuser 13 is made equal. The inner diameters of the insertion holes 28 and 29 are substantially the same as the outer diameters of the pipes 31 and 32 of the diffuser pipe 13. The insertion holes 28 and 29 have a function of aligning the diffuser 13 in the horizontal direction orthogonal to the mounting direction. Specifically, the insertion holes 28 and 29 are orthogonal to the mounting direction D between the center point of the air diffusion hole 13a and the center point of the membrane arrangement hole 15 when the air diffusion tube 13 is attached and the insertion portions 31c and 32c are inserted. It is possible to perform alignment so that the positions in the horizontal direction substantially coincide with each other.

  At the corner between the bottom surface 22b and the side surface 22c of the internal space 22 and the corner between the bottom surface 22b and the side surface 22d, the air diffuser 13a is disposed at the position of the membrane disposing hole 15 when the air diffuser 13 is attached. A guide portion 25 that guides the air diffusion tube 13 is formed. The guide portion 25 is configured by raising and bottoming the bottom surface 22b from the mounting opening 23 to the receiving surface 22a in the vicinity of each corner portion, and the raised top surface is the guided portions 34a and 34b of the guided member 34. And it functions as a guide surface that contacts the guided portions 33a and 33b of the handle member 33. The size between the upper surface of the guide portion 25 and the upper surface of the internal space 22 is substantially the same as the thickness of the guided member 34 and the handle member 33. Further, the distance between the guide portions 25 at both ends is smaller than the lengths of the guided member 34 and the handle member 33 in the longitudinal direction. In addition, the space between the handle member 33 and the bottom surface 22b of the internal space 22 can be used as a space for putting a hand when taking out.

  At both ends in the longitudinal direction of the front surface 12 a of the pedestal 12, that is, at both edges in the longitudinal direction of the attachment port 23, stoppers 24 for holding the air diffuser 13 at the time of attachment are formed. The stopper 24 includes a claw portion 24a formed by bending and tilting one end side of a rectangular plate-like member, and an unbent flat plate portion 24b on the other end side. The stopper 24 is configured such that the flat plate portions 24b are arranged on both edge portions of the mounting opening 23 so that the claw portions 24a enter the internal space 22, and the pins 24c are inserted into the front surface 12a via the flat plate portions 24b. It is attached so as to be rotatable around 24c. When the air diffuser 13 is attached to the pedestal 12 and rotated inward to hold the air diffuser 13, the stopper 24 contacts the back surface of the handle member 33 so that the air diffuser 13 is received by the receiving surface 22 a. It has the function to urge toward the mounting direction D. Thereby, the position of the air diffusing tube 13 can be reliably held.

  Next, the operation and effect of the air diffuser 2 according to this embodiment will be described.

  First, the case where the diffuser 13 is attached to the pedestal 12 will be described. With the claw portion 24a of the stopper 24 rotated upward, the guided portions 34a and 34b of the guided member 34 of the air diffuser 13 are placed on the upper surface of the guide portion 25 of the base 12 and pushed toward the extraction direction D. Thus, the air diffuser 13 enters the internal space 22 while being guided by the guide portion 25. When entering a certain distance, the insertion portions 31 c and 32 c of the diffusion tube 13 are inserted into the insertion holes 28 and 29 formed in the wall portion 27 of the base 12. At this time, since the tip portions of the insertion portions 31c and 32c are tapered, they are easily inserted into the insertion holes 28 and 29. At this time, alignment in the horizontal direction orthogonal to the mounting direction D of the air diffuser 13 is performed by the insertion holes 28 and 29. When the air diffuser 13 is further inserted, the guided portions 33 a and 33 b of the handle member 33 are also guided by the guide portion 25. Further, the guided member 34 is received by the receiving surface 22 a through the packing 37. At this time, alignment in the attachment direction D of the air diffusing tube 13 is performed by the receiving surface 22a. Next, by rotating the stopper 24 inward, the air diffuser 13 is held by being urged by the claw portion 24a. As a result, the air diffuser 13 is positioned and disposed so that the center point of the air diffuser hole 13a and the center point of the membrane disposing hole 15 are substantially coincident with each other. Further, the air supplied from the air supply pipe 14 passes through the gas flow path 26 and branches at the insertion holes 28 and 29, flows into the pipes 31, 32, and 36 from the insertion portions 31c and 32c, and passes through the air diffusion holes 13a. Released. At this time, air leakage from the insertion holes 28 and 29 can be prevented by the packings 37 and 38. As described above, since the air diffusion holes 13a are aligned with the membrane arrangement holes 15, it is possible to diffuse air from the optimum position for removing deposits with respect to the hollow fiber membrane 3a.

  When removing the air diffuser 13 from the pedestal 12, the air diffuser 13 can be easily removed by releasing the biasing force by rotating the stopper 24 upward and pulling out the handle member 33. After removal, the inside of the air diffuser 13 can be cleaned to prevent clogging and attached to the base again, or it can be replaced with a new air diffuser 13.

  As described above, in the immersion membrane unit 1 and the air diffusion device 2 according to the present embodiment, the base 12 provided with the gas flow path 26 for supporting the hollow fiber membrane 3a and supplying the gas is diffused. A diffuser hole 13a is formed, and is detachably attached to the pedestal 12 and includes a diffuser tube 13 communicated with the gas flow path 26 at the time of attachment. Therefore, when the usage time elapses, only the removable diffuser tube 13 is removed, and only the diffuser tube 13 is cleaned to clean the deposits or to be replaced with a new diffuser tube 13. When attaching, only the diffuser tube 13 is attached to the pedestal 12, and the gas flow path 26 and the diffuser tube 13 communicate with each other. Therefore, when removing the diffuser tube 13 and the supply tube 14, it is necessary to disassemble the diffuser tube 13 Therefore, when attaching, it is not necessary to connect the air diffuser 13 and the air supply pipe 14, so that the attaching / detaching work can be easily performed. Furthermore, since the diffuser tube 13 is configured to be attached to the pedestal 12 supporting the hollow fiber membrane 3a, if the alignment between the hollow fiber membrane 3a and the pedestal 12 is performed, The alignment of the hollow fiber membrane 3a and the diffuser holes 13a of the diffuser tube 13 is completed by simply performing the alignment between the diffuser tube 13 and the pedestal 12. As described above, it is possible to greatly reduce the load of maintenance work, thereby preventing clogging of the air diffuser and reducing the replacement frequency of the hollow fiber membrane 3a.

  Further, in the air diffuser 2 according to the present embodiment, the pedestal 12 penetrates upward from the internal space 22 through the internal space 22 in which the air diffuser 13 is inserted and accommodated from the attachment port 23 formed in the front surface 12a. The membrane arrangement hole 15 for arranging the hollow fiber membrane 3a and the inner space 22 are formed so that the diffusion hole 13a is arranged at the position of the membrane arrangement hole 15 when the diffusion tube 13 is attached. The air diffusion tube 13 includes guided portions 34 a, 34 b, 33 a, and 33 b that are guided by the guide portion 25 of the base 12. Thus, the air from the air diffuser 13a is diffused from the appropriate position to the hollow fiber membrane 3a through the membrane disposing hole 15 only by inserting the air diffuser 13 into the internal space 22 while being guided by the guide portion 25. can do.

  Further, in the air diffuser 2 according to the present embodiment, the pedestal 12 includes a wall portion 27 provided between the gas flow path 26 disposed on the opposite side of the attachment port 23 and the internal space 22, and the wall portion 27. Are inserted in the mounting direction D, and are provided with insertion holes 28 and 29 for communicating the internal space 22 and the gas flow path 26. The air diffuser 13 is inserted into the insertion holes 28 and 29 at the time of mounting. In addition, there are provided insertion portions 31c and 32c in which the internal flow paths 31a and 32a are opened at the tips, and packings 37 and 38 for sealing the insertion holes 28 and 29 at the time of attachment are attached to the insertion portions 31c and 32c. ing. Therefore, when attaching the air diffuser 13, air can be supplied from the gas flow path 26 into the air diffuser 13 by simply inserting the insertion portions 31 c and 32 c into the insertion holes 28 and 29. Can be aerated.

  In the air diffuser 2 according to this embodiment, the wall 27 aligns the air diffuser 13 in the attachment direction D, and the insertion holes 28 and 29 are positions of the air diffuser 13 in the direction orthogonal to the attachment direction D. It is set as the structure which matches. Therefore, when attaching the diffuser tube 13, the diffuser tube 13 is positioned by a simple operation of inserting the insertion portions 31 c and 32 c into the insertion hole 28 and receiving the diffuser tube 13 by the wall portion 27. Can do.

  The present invention is not limited to the embodiment described above.

  For example, you may apply the diffuser 50 of a structure as shown in FIG. As shown in FIG. 6, the air diffuser 50 has an inner space 71 and its mounting opening at both ends, a wall portion 75 and a gas flow path are formed in a thick portion at the center position, and a film arrangement The pedestal 51 is provided with six holes 72, and a U-shaped diffuser tube 52 is provided.

  The diffuser tube 52 includes three tubes 53, 54, and 55 that extend in the mounting direction, an insertion portion 59, and tubes 56, 57, and 58 that extend in the horizontal direction orthogonal to the mounting direction. The tube 56 communicates the rear ends of the tubes 53, 54, 55, the tube 57 communicates the central positions of the tubes 53, 54, 55, and the tube 58 communicates the front ends of the tubes 53, 54, 55. Yes. The insertion portion 59 is configured by extending the tube 55 to the front side. A packing 61 is attached to the insertion portion 59. A handle member 62 is attached to the back side of the tube 56, and a guided member 63 is attached to the insertion portion 59. Also, three diffuser holes 52a are formed in each of the tubes 53 and 54.

  In such an air diffuser 50, the air diffuser 52 is inserted into the internal space 71 of the pedestal 51, the insertion portion 59 is inserted into the insertion hole 73 formed in the wall portion 72, and the guided member 63 is received by the receiving surface 71a. By receiving, the diffuser tube 52 of the pedestal 51 can be attached to the pedestal 51. At this time, the receiving surface 71a is aligned in the mounting direction of the diffusing tube 52, and the insertion hole 73 is aligned in the horizontal direction perpendicular to the mounting direction of the diffusing tube 52. As a result, the positions of the air diffusion holes 52a and the film arrangement holes 72 can be matched.

  Further, an air diffuser 80 having a configuration as shown in FIG. 8 may be used. As shown in FIG. 7, the air diffuser 80 is different from the air diffuser 50 shown in FIG. 6 in that the air diffuser includes two insertion portions 81 and 82.

  Further, for example, when the tip portion other than the insertion portion of the diffuser tube is screwed and a cap is attached, and the dust tube is clogged with dirt such as sludge, the cap may be removed to clean the inside of the tube.

  In the above-described embodiment, the gas flow path is formed by providing a cavity in the resin. Alternatively, the gas flow path may be formed by attaching a pipe to the resin.

  In the above description, the cylindrical membrane type immersion membrane unit has been described. However, the present invention is not limited to this and may be applied to a planar membrane type immersion membrane unit.

  DESCRIPTION OF SYMBOLS 1 ... Submerged membrane unit, 2 ... Air diffuser, 3a ... Hollow fiber membrane (immersion type separation membrane), 12 ... Base, 12e ... Upper surface, 13 ... Air diffuser tube, 13a ... Air diffuser hole, 15 ... Membrane arrangement | positioning hole, 22 ... Internal space, 23 ... mounting port, 25 ... guide part, 26 ... gas flow path, 27 ... wall part, 28, 29 ... insertion hole, 31b, 32b ... tip, 31c, 32c ... insertion part, 37, 38, 61 ... Packing (sealing member), D: Mounting direction.

Claims (5)

An air diffuser installed below the immersion type separation membrane installed in the tank, and diffuses gas to the immersion type separation membrane,
While supporting the immersion type separation membrane, a pedestal provided with a gas flow path for supplying gas,
And a sparge tube which the passed gas passage and communicating at Mounting against the pedestal,
The pedestal is
An internal space into which the air diffuser is inserted;
A wall provided between the gas flow path and the internal space;
An insertion hole formed by penetrating the wall portion in the mounting direction, and communicating the internal space and the gas flow path,
The air diffusing device is provided with an insertion portion that is inserted into the insertion hole at the time of attachment and in which an internal flow path of the air diffusing tube is opened at a distal end.   The air diffuser according to claim 1, wherein the air diffuser is detachably attached to the pedestal. The air diffuser has air diffuser holes,
  The pedestal has a membrane arrangement hole formed on the upper surface side for arranging the immersion type separation membrane,
  The said diffuser is arrange | positioned in the position of the said film | membrane arrangement | positioning hole, when the said diffuser is inserted in the said base and the said diffuser and the said gas flow path connect. Air diffuser. The said wall part performs the alignment of the said diffuser tube in an attachment direction, and the said insertion hole aligns the said diffuser tube in the direction orthogonal to the said attachment direction . The air diffuser according to one item . An air diffuser according to any one of claims 1 to 4 ,
An immersion membrane unit comprising: an immersion type separation membrane.

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