JP2007203254A - Membrane module for membrane separation type water-purifying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane module for a membrane separation type water-purifying apparatus which can prevent an end part in the bent side of a hollow fiber membrane from winding and gain a high effect of reduction in a generation of clogging due to an adhesion of dirt to the hollow fiber membrane. <P>SOLUTION: A plurality of hollow fiber membranes 1 are bent; both the end parts of each hollow fiber membrane 1 are fixed to a fixation part 2, and also a water passing part 3 communicating with the inside of the hollow fiber membrane 1 through openings of both ends of the hollow fiber membrane 1 is arranged at the fixation part 2 to form the membrane module for the membrane separation type water-purifying. The hollow fiber membrane 1 is arranged with a bending part positioned at the lower end, and an end-part holding member 4 is penetrated in the inside of the end part of the bent side of each hollow fiber membrane 1. Then, the end-part holding member 4 is formed as an aeration tube 5 for aerating air. The generation of clogging due to an adhesion of dirt to the hollow fiber membrane 1 can be decreased by using the end-part holding member 4 as the aeration tube 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a membrane separation type water purification apparatus that purifies raw water with activated sludge in a septic tank and separates it from the activated sludge by filtering the purified water through a membrane module provided in the septic tank, and then drains the water. The present invention relates to a membrane module used in the above.

  Various types of membrane modules formed of hollow fiber membranes have been conventionally provided as membrane modules used in membrane separation type water purification devices. Many hollow fiber membranes are used by bundling them. There are cases where a bundle of hollow fiber membranes is used by aligning them in a straight line, and cases where a bundle of hollow fiber membranes is bent in a U shape. .

  FIG. 14 shows an example in which a hollow fiber membrane 1 is bent in a U shape to form a membrane module. A bundle of hollow fiber membranes 1 is bent in a U shape to align both ends. Both end portions are fixed to the fixing portion 2 and attached to the inside of the outer cylinder container 15 whose lower end is opened to form a membrane module. When this membrane module is used in a septic tank of a membrane separation type water purification device, activated sludge and the like adhere to the hollow fiber membrane 1 as dirt, and clogging is likely to occur. For this reason, by introducing diffused air from the diffuser pipe provided at the bottom of the septic tank from the lower end opening of the outer cylinder container 15, the hollow fiber membrane 1 is vibrated with this diffused air, thereby preventing the adhesion of dirt. To reduce clogging.

However, in the case where the hollow fiber membrane 1 is bent in a U shape and both end portions are fixed to the fixing portion 2, both end portions are held, and the end portion on the bent side becomes a free end. For this reason, when aeration air is applied to the hollow fiber membrane 1 to vibrate, the bent ends of the hollow fiber membrane 1 are greatly disturbed and entangled, and the water flow efficiency into the hollow fiber membrane 1 is improved. It decreases, and dirt such as activated sludge becomes clogged and becomes easy to adhere. For this reason, in the thing of FIG. 14, the shape holding | maintenance material 16 is attached to the fixing | fixed part 2, and the edge part holding member 14 provided in the shape holding | maintenance material 16 is penetrated inside the edge part of the bent side of a hollow fiber membrane, and hollow By holding the end portion on the bent side, which is the free end of the yarn membrane 1, by the end portion holding member 14, the end portion on the bent side of the hollow fiber membrane 1 is prevented from being entangled. In FIG. 14, reference numeral 17 denotes a vibration suppressing material that suppresses large vibrations of the shape maintaining material 16 (see Patent Document 1).
Japanese Patent Laid-Open No. 10-286440

  By holding the end portion on the bent side that is the free end of the hollow fiber membrane 1 with the end holding member 4 as described above, the bent side end portion of the hollow fiber membrane 1 can be prevented from being entangled. However, on the contrary, the vibration of the hollow fiber membrane 1 is also suppressed by the end holding member 14. Therefore, the hollow fiber membrane 1 is vibrated by the air diffused from the bottom of the septic tank, and the effect of preventing clogging and reducing clogging is reduced.

  The present invention has been made in view of the above points, and can prevent the end of the bent side of the hollow fiber membrane from being entangled, and can cause clogging due to contamination of the hollow fiber membrane. It is an object of the present invention to provide a membrane module for a membrane separation type water purification device that can obtain a high effect of reducing water.

  The membrane module for a membrane separation type water purification apparatus according to claim 1 of the present invention bends a plurality of hollow fiber membranes 1 to fix both ends of each hollow fiber membrane 1 to a fixing part 2, 2 is a membrane module for a membrane separation type water purification device, which is formed by providing a water passage portion 3 communicating with the inside of the hollow fiber membrane 1 through openings at both ends of the hollow fiber membrane 1. Are arranged in such a posture that the bent portion is at the lower end, and the end holding member 4 is inserted inside the bent end of each hollow fiber membrane 1 and the end holding member 4 is diffused with air. 5 is formed.

  According to the present invention, the end holding member 4 is inserted inside the end of the hollow fiber membrane 1 on the bent side so that the end of the bent side that is the free end of the hollow fiber membrane 1 is entangled. Since this end holding member 4 is formed as an air diffuser tube 5, the air diffused from the air diffuser tube 5 is blown onto the hollow fiber membrane 1 to vibrate the hollow fiber membrane 1. It is possible to obtain a high effect of reducing the occurrence of clogging due to dirt adhering to the hollow fiber membrane 1.

  The invention of claim 2 is characterized in that, in claim 1, the auxiliary air diffuser 6 is disposed below the bent portion of the hollow fiber membrane 1.

  According to this invention, air can be uniformly diffused from the auxiliary air diffusing tube 6 to the entire hollow fiber membrane 1, and the effect of reducing the occurrence of clogging in the hollow fiber membrane 1 can be further enhanced. Is.

  In addition, the invention of claim 3 is the arrangement according to claim 2, which is arranged below the bent portion of the hollow fiber membrane 1 between the air diffuser 5 and the auxiliary air diffuser 6 so as to intersect the air diffuser 5 in plan view. The second auxiliary air diffusing tube 7 is arranged and provided.

  According to this invention, air can be uniformly diffused to the entire hollow fiber membrane 1 from the second auxiliary air diffuser tube 7 in addition to the auxiliary air diffuser tube 6, and the hollow fiber membrane 1 is clogged. The effect of reducing can be obtained even higher.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a plurality of the diffuser tubes 5 are arranged in parallel, and a plurality of the diffuser tubes 5 are arranged in parallel on the lower side of the upper diffuser tube 8. The upper air diffuser tube 8 and the lower air diffuser tube 9 are crossed in plan view, and one hollow fiber membrane 1 of the pair of hollow fiber membranes 1 is connected to the upper air diffuser tube 8 and the lower air diffuser tube 9. Of the four corners formed in plan view by intersecting the trachea 9 in plan view, the pair of facing corners are arranged in plan view, and the other hollow fiber membrane 1 is opposed to the other. By inserting the upper air diffuser tube 8 and the lower air diffuser tube 9 inside the bent portion of the pair of hollow fiber membranes 1 so as to be arranged in a pair of corners in plan view, the pair of hollow fiber membranes 1 is formed by crossing the lower side of the lower air diffuser 9.

  According to the present invention, the pair of hollow fiber membranes 1 bent in a U-shape are crossed at the lower ends of the bending, so that the hollow fiber membranes 1 are not in close contact with each other between the hollow fiber membranes 1. A gap can be formed, and dirt such as activated sludge can be prevented from accumulating and accumulating between the closely attached hollow fiber membranes 1.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the fixing portion 2 includes the water passage portion 3 and the air introduction portion 10 that surrounds the outer side of the water passage portion 3. The part 10 is formed by communicating with the air diffusing tube 5.

  According to the present invention, the water passing portion 3 for passing purified water that has passed through the hollow fiber membrane 1 and discharging it to the outside is surrounded by the air introduction portion 10 that supplies air to the air diffuser 5, and the fixing portion 2. Even if the outer shell forming the surface is broken, it is possible to prevent the water passage part 3 from being damaged only by the air introduction part 10 being damaged, and the water passage part 3 does not pass through the hollow fiber membrane 1 Water and activated sludge can be prevented from flowing in and discharged.

  According to the present invention, it is possible to prevent the end holding member 4 from being entangled with the end on the bent side, which is the free end of the hollow fiber membrane 1, and the end holding member 4 as the air diffuser 5. By utilizing the air, the air diffused from the air diffusing tube 5 can be blown onto the hollow fiber membrane 1 to vibrate the hollow fiber membrane 1, and dirt is attached to the hollow fiber membrane 1 to cause clogging. A high effect of reducing the occurrence can be obtained.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of an embodiment of the present invention. The hollow fiber membrane 1 can be made of any conventionally known material such as polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylonitrile, porsulfone, and the pore diameter is not particularly limited. Absent. Then, a plurality of hollow fiber membranes 1 are bundled through a predetermined gap, the bundle of hollow fiber membranes 1 is bent into a U shape, and both ends of the hollow fiber membrane 1 are embedded in the adhesive. Is cured so that both ends of each hollow fiber membrane 1 are bonded together by the adhesive portion 20. Openings at both ends of each hollow fiber membrane 1 are opened on the upper surface of the bonding portion 20.

  The fixing portion 2 is formed in a double structure from a water passage portion 3 whose lower surface is open and an air introduction portion 10 surrounding the outer peripheral surface of the upper surface of the water passage portion 3. A drain tube 22 communicating with the inside of the water flow portion 3 protrudes upward. An air supply cylinder 23 projects from the upper surface of the air introduction part 10 so as to surround the outside of the drain cylinder 22. The air supply cylinder 23 communicates with the air introduction unit 10, and a connection port 24 is provided on the outer periphery of the air introduction cylinder 23.

  Then, the both ends of each hollow fiber membrane 1 bent in a U-shape are fixed to the fixing part 2 by fitting the adhesive part 20 so as to close the opening on the lower surface of the water passing part 3 and fixing it. In this way, the openings at both ends of the hollow fiber membrane 1 are open in the water passage 3. As described above, the hollow fiber membrane 1 is arranged in a posture in which both end portions are fixed to the fixing portion 2 in a cantilevered state and both end portions are on the upper side and the bent portion is on the lower side.

  Moreover, the lower surface of the air introduction part 10 surrounding the water flow part 3 is closed, but a pair of frame struts 26 project downward at the two locations. The frame column 26 is formed in a pipe shape having an air flow path 27 inside, and the upper end is opened to allow the air flow path 27 to communicate with the inside of the air introduction unit 10 and the lower end is closed. The end holding member 4 is horizontally disposed between the lower ends of the pair of frame columns 26, and both ends of the end holding member 4 are connected and fixed to the frame columns 26. This end holding member 4 is inserted so as to be stabbed inside the bent side end of the bundle of hollow fiber membranes 1 and is a bent end that is a free end of the hollow fiber membrane 1 fixed in a cantilever state. The portion can be held by the end holding member 4. The end holding member 4 is formed in a hollow pipe shape, the hollow interior is communicated with the air flow path 27 of the frame column 26, and the end holding member 4 is formed by drilling a diffuser hole 28. Is formed as a diffuser tube 5.

  The membrane module according to the present invention formed as described above is used by being installed in the septic tank of the membrane separation type water purification device, and the drain tube 22 of the fixed part 2 is provided with a suction pump or the like. A suction / discharge pipe (not shown) is connected, and a blower pipe (not shown) provided with a blower or the like is connected to the connection port 24 of the air supply cylinder 23. When the suction pump of the suction / discharge pipe is operated, the inside of the water passage 3 is sucked and depressurized through the drain tube 22, so that the water purified by the activated sludge in the septic tank moves the hollow fiber membrane 1 from its outer periphery. It passes through the inner periphery and flows into the hollow fiber membrane 1, and further flows into the water passage 3 from the hollow fiber membrane 1 and is collected, and then is discharged from the suction / discharge pipe through the drain tube 22. is there.

  Here, since the end of the membrane module on the bent side of the hollow fiber membrane 1 is a free end, when the end of the bent side of the bundle of hollow fiber membranes 1 is entangled, the hollow fiber membrane 1 However, as described above, the end of the hollow fiber membrane 1 on the bent side is likely to be contaminated with the activated sludge that accumulates in the gaps of the tangled hollow fiber membranes 1. Since the end holding member 4 is inserted inside the end bundle, the end bundle on the bent side of the hollow fiber membrane 1 is held in a state constrained by the end holding member 4. Accordingly, it is possible to prevent the entanglement of the hollow fiber membrane 1 and prevent the water flow efficiency of the hollow fiber membrane 1 from being lowered, and the activated sludge is accumulated in the entangled portion. This can be prevented in advance.

  Moreover, in this invention, the edge part holding member 4 holding the bent lower end part of this hollow fiber membrane 1 is formed as the air diffusion pipe | tube 5 which provided the air diffusion hole 28, and air is supplied from the air supply pipe 23 to the air supply cylinder 23, The air is supplied into the diffuser pipe 5 through the air introduction part 10 and the air flow path 27 of the frame column 26. Then, when air is supplied to the diffuser tube 5 formed by the end holding member 4 and air is diffused from the diffuser holes 28, the diffused air is blown against the hollow fiber membrane 1. Thus, the hollow fiber membrane 1 is vibrated. Therefore, it is possible to prevent activated sludge from accumulating on the surface of the hollow fiber membrane 1 to prevent dirt from adhering, and to reduce the occurrence of clogging in the hollow fiber membrane 1. Moreover, since the end of the bent side that is the free end of the hollow fiber membrane 1 is held by the air diffusing tube 5, the hollow fiber membrane 1 is not entangled and air is supplied to the hollow fiber membrane 1. It is possible to prevent clogging by aeration.

  Here, since the fixing portion 2 is formed in a double structure in which the outer peripheral surface of the upper surface of the water passing portion 3 is surrounded by the air introduction portion 10 as described above, the outline of the fixing portion 2 is damaged due to the action of an external force or the like. In this case, even if the inside of the air introduction part 10 is exposed due to the damage of the outer shell, the inside of the water passage part 3 is not exposed. Therefore, even if the outer shell of the fixed portion 2 is damaged, the air is leaked from the air introduction portion 10, and the inside of the water passage portion 3 is exposed due to the outer shell of the fixed portion 2 being damaged. It is possible to prevent an accident in which untreated water or activated sludge flows into the water passage 3 from the damaged portion and is discharged to the outside from the water passage 3 through the suction discharge pipe.

  FIG. 2 shows another embodiment of the present invention. A diffuser tube 5 formed as an end holding member 4 is attached to a position slightly above the lower ends of a pair of frame struts 26 so that the hollow fiber membrane 1 Is inserted inside the bent lower end of the bundle. An auxiliary air diffuser 6 is arranged in parallel with the air diffuser 5 at a position below the bent lower end of the hollow fiber membrane 1, and the auxiliary air diffuser 6 is attached between the lower ends of the pair of frame columns 26. The auxiliary air diffusion pipe 6 is formed as a hollow pipe, and the hollow interior is communicated with the air flow path 27 of the frame column 26, and a large number of air diffusion holes 28 are provided. The air diffuser 28 of the auxiliary air diffuser 6 is provided in a larger number than the air diffuser 28 of the air diffuser 5 so that the amount of air diffused in the auxiliary air diffuser 6 is larger than that of the air diffuser 5. In the embodiment shown in FIG. 2, a vertical air diffuser 30 is installed between the air diffuser 5 and the central portion of the auxiliary air diffuser 6. The vertical air diffuser 30 is formed as a hollow pipe, communicates with the air diffuser 5 and the auxiliary air diffuser 6 inside, and has a large number of air diffusers 28. Other configurations are the same as those in FIG.

  In the case of FIG. 2, air is diffused from the auxiliary diffuser tube 6 in addition to the diffuser tube 5, and this diffused air is uniformly blown to the hollow fiber membrane 1. Therefore, the effect of reducing the occurrence of clogging in the hollow fiber membrane 1 can be obtained higher. Furthermore, since the air diffused from the longitudinal air diffuser 30 is also uniformly blown to the hollow fiber membrane 1, the effect of preventing clogging can be further enhanced. In addition, since the vertical air diffuser 30 is disposed vertically between the central portions of the air diffuser 5 and the auxiliary air diffuser 6, the hollow air diffuser 5 is hollow when inserted through the bent lower end of the bundle of the hollow fiber membranes 1. The bundle of the yarn membranes 1 can be divided into two small bundles on the left and right by the longitudinal air diffuser 30, and the hollow fiber membranes 1 are more difficult to be entangled.

  In the embodiment of FIG. 3, a perforated plate 33 provided with a large number of through holes 32 between the diffuser tubes 5 and the auxiliary diffuser tubes 6 arranged in parallel as shown in FIG. 2 is attached. Each hollow fiber membrane 1 in the bundle of hollow fiber membranes 1 is passed through each through hole 32 of the porous plate 33 one by one. Other configurations are the same as those in FIG. Therefore, in this embodiment, the hollow fiber membranes 1 are separated by the through holes 32 of the porous plate 33, so that the hollow fiber membranes 1 can be reliably prevented from being entangled and the hollow fiber membranes 1 are in close contact with each other. This prevents the activated sludge from accumulating and adhering to the close contact portion.

  In the embodiment of FIG. 4, four frame columns 26 having air flow paths 27 are provided at equal intervals. And while attaching the diffuser pipe | tube 5 used as the edge part holding member 4 between the lower end parts of every other pair of frame support | pillar 26, on the lower side of this diffuser pipe | tube 5, other pair of every other frame support | pillar 26 of a pair. The auxiliary air diffusing tube 6 is attached between the lower ends, and the air diffusing tube 5 and the auxiliary air diffusing tube 6 are arranged so as to intersect at right angles in a plan view. In the embodiment shown in FIG. 4, a vertical air diffuser 30 is attached between the intersections of the air diffuser 5 and the auxiliary air diffuser 6. Other configurations are the same as those in FIG.

  5 and 6 show another embodiment of the present invention, in which four frame columns 26 having air flow paths 27 are provided at equal intervals. In the same manner as in the embodiment of FIG. 2, the air diffuser 5 and the auxiliary air diffuser 6 are attached vertically between the lower ends of every other pair of frame columns 26. Further, between the diffuser pipe 5 and the auxiliary diffuser pipe 6, a second auxiliary diffuser pipe 7 is attached between the lower ends of every other pair of frame supports 26. The air diffuser 5 and the auxiliary air diffuser 6 are arranged so as to intersect perpendicularly in plan view. The second auxiliary diffuser tube 7 is formed as a hollow pipe, and the hollow interior is communicated with the air flow path 27 of the frame column 26, and a large number of diffuser holes 28 are provided. The diffuser holes 28 of the second auxiliary diffuser tube 7 are provided in a smaller number than the diffuser holes 28 of the diffuser tube 5 and the auxiliary diffuser tube 6, and therefore the amount of diffused air is the auxiliary diffuser tube 6, the diffuser tube 5, and the second auxiliary diffuser. The trachea 7 decreases in order. In the embodiment of FIGS. 5 and 6, the vertical air diffuser 30 is attached between the intersection of the air diffuser 5 and the second auxiliary air diffuser 7 and between the intersection of the second auxiliary air diffuser 7 and the auxiliary air diffuser 6. The longitudinal diffuser 30 is communicated with the diffuser 5, the auxiliary diffuser 6, and the second auxiliary diffuser 7. Other configurations are the same as those in FIGS. 1, 2, and 4.

  In this case, air is diffused from the second auxiliary diffuser tube 7 in addition to the diffuser tube 5 and the auxiliary diffuser tube 6, and this diffused air is uniformly blown to the hollow fiber membrane 1. . Therefore, the effect of reducing the occurrence of clogging in the hollow fiber membrane 1 can be obtained higher. Furthermore, since the air diffused from the longitudinal air diffuser 30 is also uniformly blown to the hollow fiber membrane 1, the effect of preventing clogging can be further enhanced. Further, the bundle of the hollow fiber membranes 1 is divided into two small bundles on the left and right by the vertical air diffuser tube 30, and the hollow fiber membranes 1 are more difficult to be entangled.

  The embodiment of FIG. 7 is the same as that of FIG. 5 and FIG. 6, and a perforated plate 33 in which a large number of through holes 32 are provided between the air diffuser pipe 5 and the auxiliary air diffuser pipe 6 arranged in parallel. Is supposed to be attached. Each hollow fiber membrane 1 in the bundle of hollow fiber membranes 1 is passed through each through hole 32 of the porous plate 33 one by one. Other configurations are the same as those in FIG. Therefore, in this embodiment, the bundle of the hollow fiber membranes 1 can be divided into two small bundles on the left and right by the vertical diffuser tube 30, and each hollow fiber membrane 1 can be separated by the through holes 32 of the perforated plate 33.

  FIG. 8 shows another embodiment of the present invention, and the bundle of hollow fiber membranes 1 having both ends fixed to the fixing portion 2 as described above is contained in a rectangular tube-shaped tube container 35 whose bottom surface is open. It is attached to. In this embodiment, the diffuser tubes 5 are a plurality of upper diffuser tubes 8 arranged in parallel at the same height, and a plurality of diffuser tubes arranged in parallel at the same height at a position below the upper diffuser tube 8. And the lower air diffuser 9. Upper air supply cylinders 36 are respectively provided at two opposite positions on the inner surface of the cylindrical container 35, and lower air supply cylinders 37 are respectively provided at two other positions opposite to the inner surface of the cylindrical container 35 at a lower position of the upper air supply path 36. Each of the upper air supply cylinder 36 and the lower air supply cylinder 37 is provided with a connecting cylinder 38 projecting from a ventilation pipe (not shown) provided with a blower or the like. Both ends of the upper air diffuser 8 are attached to the upper air supply tube 36, and both ends of the lower air diffuser 9 are respectively attached to the lower air supply tube 37. The upper air diffuser 8 and the lower air diffuser 9 are viewed in plan view. Crossed so as to be orthogonal. The air diffuser hole 28 is provided at a location where the upper air diffuser tube 8 and the lower air diffuser tube 9 do not intersect, and the air blown from the blower is sent from the upper air supply tube 36 to the upper air diffuser tube 8 and from the lower air supply tube 37 to the lower air diffuser. The air is sent to the air diffuser 9 and is diffused from the air diffuser holes 28 of the upper air diffuser 8 and the lower air diffuser 9.

  Further, the upper air diffuser 8 and the lower air diffuser 9 are inserted into the inside of the bent lower end of the bundle of hollow fiber membranes 1 whose both ends are fixed to the fixed part 2, and the bent end of the hollow fiber film 1 is held. However, a pair of hollow fiber membranes 1 is held at each intersection of the upper air diffuser tube 8 and the lower air diffuser tube 9. That is, as shown in FIG. 8 (b), four intersecting corners are formed in each crossing portion of the upper air diffuser tube 8 and the lower air diffuser tube 9 in plan view, but one of the hollow fiber membranes 1 is hollow. The yarn membrane 1 is disposed at a pair of corners facing each other via the upper air diffuser tube 8 and the lower air diffuser tube 9, and the other hollow fiber membrane 1 is opposed via the upper air diffuser tube 8 and the lower air diffuser tube 9. The pair of hollow fiber membranes 1 are crossed under the lower air diffuser tube 9 as shown in FIG. 8C. By inserting the upper air diffuser tube 8 and the lower air diffuser tube 9 inside the bent portion of the hollow fiber membrane 1 so as to cross the pair of hollow fiber membranes 1 in this way, the hollow fiber membranes 1 are in close contact with each other. It is possible to form a gap between the hollow fiber membranes 1 and prevent dirt such as activated sludge from accumulating and accumulating between the closely attached hollow fiber membranes 1. Further, air can be uniformly diffused from the air diffuser holes 28 of the upper air diffuser tube 8 and the lower air diffuser tube 9 to each hollow fiber membrane 1, and the effect of preventing clogging can be obtained highly.

  FIG. 9 shows a reference example of the membrane module. The hollow fiber membrane 1 is bent in a U-shape in the same manner as described above, and both ends thereof are bonded and fixed by the bonding portions 20. The fixing part 2 is formed in a double structure in which an outer cylinder 41 is arranged outside the cylinder body 40, the hollow fiber membrane 1 is disposed in the cylinder body 40 and the adhesive part 20 is attached in the upper part of the cylinder body 40. Thus, the water passing portion 3 is formed between the bonding portion 20 and the inside of the cylindrical body 40. A drain tube 22 protrudes from the water passage 3, and a suction discharge pipe (not shown) provided with a suction pump or the like is connected to the drain tube 22. Further, the air introduction part 10 is formed between the outer cylinder 41 and the cylinder body 40, and the air supply cylinder 23 projects from the upper surface of the air introduction part 10 so as to surround the outside of the drainage cylinder 22. The air supply tube 23 is connected to a blower pipe (not shown) provided with a blower or the like. The outer cylinder 41 has a lower end extending downward from the lower end of the cylinder 40, and the air introduction part 10 is opened in the lower part of the outer cylinder 41. A cylindrical communication port 42 is provided between the outer cylinder 41 and the cylinder 40, and the inside of the cylinder 40 is opened to the outside of the outer cylinder 41.

  Further, in the lower part of the cylindrical body 40, a plurality of upper holding shafts 43 arranged in parallel at the same height, and a plurality of pieces arranged in parallel at the same height at a position below the upper holding shaft 43. The lower holding shafts 44 are attached, and the upper holding shafts 43 and the lower holding shafts 44 cross each other so as to be orthogonal to each other in plan view. The upper holding shaft 43 and the lower holding shaft 44 are inserted into both ends of the bent lower end portion of the bundle of hollow fiber membranes 1 to hold the bent end portion of the hollow fiber membrane 1. A pair of hollow fiber membranes 1 is held at each intersection of the shaft 43 and the lower holding shaft 44, and as shown in FIGS. 9B and 9C, the same as in FIGS. 8B and 8C. Thus, the pair of hollow fiber membranes 1 are crossed on the lower side of the lower holding shaft 44.

Membrane module is formed as described above are those levels L ₁ of water containing activated sludge is placed in the septic tank so as to become in Figure 9 (a). And when air is supplied to the air introduction part 10 from a ventilation pipe, since air will enter into the cylinder 40 from the opening of the lower end of the air introduction part 10 as shown by a arrow in FIG. As a result of the flow, water containing activated sludge rises as shown by the arrow b and enters the cylinder 40, and flows out to the outside as shown by the arrow c through the communication port 42. With this fast flow, the hollow fiber membrane 1 It is possible to prevent dirt such as activated sludge from clogging and adhering between them. Further, since the upper holding shaft 43 and the lower holding shaft 44 can be formed as thin rods, the interval can be increased, and water containing activated sludge can be easily passed and the effect of preventing the adhesion of dirt can be enhanced. It is something that can be done.

  FIG. 10 shows another reference example of the membrane module, in which the fixing portion 2 is formed in a single structure having only the cylinder 40 that does not include the outer cylinder 41. The structure for attaching the hollow fiber membrane 1 in the cylindrical body 40 is the same as that shown in FIG.

  A pair of air supply pipes 46 hang down along the outer surfaces on both sides of the cylinder 40, and the upper ends of the air supply pipes 46 are connected to the connection cylinders 47. A provided air pipe (not shown) is connected. The lower end of each air supply pipe 46 is connected to a connection pipe 72, and an air discharge pipe 79 is provided on the connection pipe 72 so as to protrude upward. As shown in FIG. 11, a valve seat 74 is provided in the air discharge pipe 79. The valve seat 74 has an air diffuser 73 communicating with the connecting pipe 72 formed on the inner periphery thereof. The air discharge pipe 79 is attached with a horizontal bar 80 penetrating inside and outside thereof, and both end portions of the horizontal bar 80 protrude outward of the air discharge pipe 79. Two horizontal bars 80 are provided crossing each other in a cross. On the lower side of the horizontal bar 80, a valve ball 81 is attached to the valve seat 74 so as to be movable up and down, and the air diffuser 73 can be opened and closed by the valve ball 81. The upper part of the air discharge pipe 79 is covered with a trap container 82 whose lower surface is open. A frustoconical valve lid 83 is provided on the upper bottom surface of the air discharge pipe 79 so that the upper end opening of the air discharge pipe 79 can be opened and closed by the valve lid 83. A vertically long slide hole 84 is formed in the peripheral wall of the trap container 82, and the end of the horizontal bar 80 is inserted into the slide hole 84. Therefore, the trap container 82 is moved up and down within a range in which the slide hole 84 can be moved up and down with respect to the horizontal bar 80. Further, the peripheral wall of the trap container 82 is provided with diffuser slits 85 at a plurality of locations in the circumferential direction, and each diffuser slit 85 is opened at the lower end edge of the peripheral wall of the trap container 82.

  In this case, when a gas such as air is sent from the blower to the connection pipe 72, the valve ball 81 is pushed up by the blown pressure to open the air diffusion hole 73, and the valve lid 83 is pushed up together with the trap container 82. Then, the gas flows into the trap container 82 from the diffuser hole 73 through the air discharge pipe 79 and is diffused from the diffuser slit 85 as indicated by an arrow a in FIG. Since the diffuser slit 85 is open at the lower end edge of the peripheral wall of the trap container 82, the diffuser slit 85 is less likely to be clogged with activated sludge. When the operation of the air blower is stopped and gas cannot be sent, the valve ball 81 falls by its own weight and the air diffuser 73 is closed, and the trap container 82 is pushed down by water pressure to open the upper end of the air discharge pipe 79. Is blocked by the valve lid 83, and the activated sludge in the septic tank can be prevented from flowing back to the air supply pipe 46 through the air discharge pipe 79 and the connecting pipe 72, and the activated sludge is contained in these pipes. It can prevent clogging due to intrusion. Here, the reverse flow of the activated sludge is triple due to the trap effect between the trap container 82 and the air discharge pipe 79, the blockage of the air discharge pipe 79 by the valve lid 83, and the blockage of the air diffusion hole 73 by the valve ball 81. Therefore, the activated sludge can be reliably prevented from flowing back.

  Then, the air containing the activated sludge enters the cylinder 40 as indicated by the arrow b by being diffused into the cylinder 40 from the diffusion slit 85 of the trap container 82 as indicated by the arrow a. Through this, a flow of flowing out to the outside as indicated by an arrow c occurs, and this fast flow can prevent dirt such as activated sludge from clogging and adhering between the hollow fiber membranes 1.

  FIG. 12 shows another reference example of the membrane module. The hollow fiber membrane 1 is bent in a U-shape as described above, and both ends thereof are bonded and fixed by the bonding portion 20, and the hollow fiber membrane 1 is mounted in the cylindrical body 40 as in the case of FIG. 10. Further, the bent lower end portion of the hollow fiber membrane 1 is held by the upper holding shaft 43 and the lower holding shaft 44 as in FIGS. 9 and 10.

  In the case of FIG. 12, the diffuser box 54 is attached to the opening on the lower surface of the cylindrical body 40. The air diffusion box 54 is formed in a box shape having an upper surface opened, and an inflow port 55 is provided on a side surface thereof. A check valve plate 56 rotates on the inner surface of the diffuser box 54 between a suspended state in which the inlet 55 is closed and a state in which the inlet 55 is opened by rotating inward of the diffuser box 54. It is attached freely. An air nozzle 57 having an upper surface opened is installed at the bottom of the air diffusion box 54, and a trap container 59 having a lower surface opened is placed on the air nozzle 57. An air supply pipe 58 is connected to the air nozzle 57, and an air supply pipe (not shown) provided with a blower or the like is connected to the air supply pipe 58. The diffuser box 54 is configured to be detachably attached to the lower end of the cylindrical body 40 by engaging an engagement plate 60 provided at the upper end thereof with the outer surface of the cylindrical body 40.

In the above, water containing activated sludge in the septic tank flows into the cylinder 40 from the communication port 61 provided in the lower part of the cylinder 40, and the communication port 42 (see FIG. ))). Then, when air is supplied to the air supply pipe 58 and discharged from the air nozzle 57, the air is diffused into the diffusion box 54 through the trap container 59. When air is diffused into the air diffusion box 54 in this way, the air inlet 55 is closed by the check valve plate 56 due to the air pressure, and the air diffusion box 54 is hermetically sealed. The water containing sludge is pushed up together with the diffused air, flows into the cylinder 40, passes through the hollow fiber membrane 1, and then flows out of the communication port 42, thereby generating a flow of water containing activated sludge. Thereafter, when the supply of air to the air supply pipe 58 is stopped, the check valve plate 56 is pushed up by the water head pressure in the septic tank, the inflow port 55 is opened, and water containing activated sludge in the septic tank flows into the inflow port. The gas flows into the diffuser box 54 from 55 and is filled. Next, when the supply of air to the air supply pipe 58 is resumed, the water containing activated sludge in the diffuser box 54 is pushed up into the cylinder 40 as described above and passes between the hollow fiber membranes 1. . By repeating the supply / stop of air to the air supply pipe 58 in this way, water containing activated sludge in the diffuser box 54 can be pushed up into the cylinder 40 and passed between the hollow fiber membranes 1. The cleaning is performed to prevent dirt such as activated sludge from adhering between the hollow fiber membranes 1 by clogging the water containing the activated sludge between the hollow fiber membranes 1. It can be done. Here, among the water containing activated sludge Chikibako 54, since the upper one is discharged pushed up from the lower end of the trap container 59, in order to lower the emission level L ₂ of the activated sludge, the trap container It is desirable to place 59 as close to the bottom surface of the diffuser box 54 as possible. Moreover, in this thing, since the air nozzle 57 which discharges air is formed in the trap structure covered with the trap container 59, it can prevent the backflow from which activated sludge flows into the air supply pipe 58 from the air nozzle 57. is there.

  In each of the above embodiments, an example in which a bundle of hollow fiber membranes 1 is bent in a U shape and both ends are bonded by an adhesive bonding portion 20 using an adhesive is shown. However, the hollow fiber membrane 1 and the bonding portion 20 are shown. In order to increase the bonding strength with each other, joint portions 64 may be provided at both ends of the hollow fiber membrane 1 as in the embodiment of FIG. That is, at both ends of the hollow fiber membrane 1, joint portions 64 are integrally provided as shown in FIG. 13A by injection molding of the same material as the hollow fiber membrane 1. As shown in FIG. 13 (b), the joint portion 64 is formed so that the cross-sectional shape and the end face shape perpendicular to the longitudinal direction of the hollow fiber membrane 1 are regular hexagons. Further, as shown in FIG. 13C, in a part of the joint portion 64, fitting projections 65 are provided on every other face of the hexagonal faces, and every other face. A fitting recess 66 is provided on the surface.

  When bundling a plurality of hollow fiber membranes 1 having the joint portions 64 formed at both ends in this way, in the joint portions 64 of the adjacent hollow fiber membranes 1, the engagement protrusions 65 of one joint portion 64 are connected to the other. In a state in which the joints 64 are fitted in the fitting recesses 66, the surfaces of the joints 64 are bonded to the hollow fiber membrane 1 with an adhesive having good adhesion compatibility, as shown in FIG. The six hollow fiber membranes 1 can be joined and fixed in a state where the six hollow fiber membranes 1 are arranged around the hollow fiber membranes 1. By joining the joining portions 64 in this way, the end portions can be coupled and fixed in a state where the required number of hollow fiber membranes 1 are bundled. Further, when the plurality of joint portions 64 are coupled and fixed, the periphery around which the joint portions 64 are gathered is uneven, so that the peripheral member 68 having a trapezoidal cross section or a long side having a rectangular cross section is V-shaped. The peripheral member 67 formed in the shape is used, and the peripheral member 67 and the peripheral member 68 are fitted and bonded to the uneven portion, and the peripheral shape is adjusted to be a flat surface. The peripheral member 67 and the peripheral member 68 are formed with a fitting recess 69 into which the fitting protrusion 65 of the joint 64 is fitted. Thus, by joining and bonding the joint portions 64 provided at both ends of the hollow fiber membrane 1, both ends can be coupled and fixed in a state where a plurality of hollow fiber membranes 1 are bundled. , Which can be firmly bonded.

  In addition, an air diffuser is attached to the bottom of the septic tank where the membrane module is installed. A blower arranged outside the tank is connected to the air diffuser, and a gas containing oxygen such as air is blown to diffuse into the purification tank. The air diffuser tube is a device that makes the gas sent from the blower into fine bubbles so that oxygen spreads in the septic tank. For example, the air diffuser tube can be formed as a pipe having a plurality of holes having a diameter of about 2 mm.

It is sectional drawing which shows an example of embodiment of this invention. It is a front view which shows an example of other embodiment same as the above. An example of other embodiment same as the above is shown, (a) is a perspective view, (b) is a partially broken front view. An example of other embodiment same as the above is shown, (a) is a perspective view, (b) is a front view. It is a perspective view which shows an example of other embodiment same as the above. It shows an example of another embodiment of the above, (a) is a cross-sectional view, (b) is a cross-sectional view of the roll line portion, (c) is a cross-sectional view of the II line portion. It is the partially broken front view which shows an example of other embodiment same as the above. It shows an example of other embodiment same as the above, (a) is a partial cross-sectional view, (b) is a cross-sectional view of a portion taken along the line II, and (c) is a bottom view. It shows a reference example, (a) is a partially broken cross-sectional view, (b) is a cross-sectional view of the line II, (c) is a bottom view. It shows another reference example, (a) is a partially broken cross-sectional view, (b) is a cross-sectional view of the ii line portion, (c) is a bottom view. The aspect of a diffuser part same as the above is shown, (a) is the BB sectional drawing of (b), (b) is the AA sectional view of (a). It shows another reference example, (a) is a partial cross-sectional view, (b) is a horizontal cross-sectional view, (c) is a bottom view. BRIEF DESCRIPTION OF THE DRAWINGS It shows an example of embodiment of a hollow fiber membrane same as the above, (a) is a front view, (b) is the expanded top view of a junction part, (c) is expanded sectional drawing of the II line part (D) is the expanded top view of the state which joined the junction part. It is a schematic perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane 2 Fixing part 3 Water flow part 4 End part holding member 5 Air diffuser pipe 6 Auxiliary air diffuser pipe 7 2nd auxiliary air diffuser pipe 8 Upper air diffuser pipe 9 Lower air diffuser pipe 10 Air introduction part

Claims (5)

  A plurality of hollow fiber membranes are bent to fix both ends of each hollow fiber membrane to a fixed portion, and a water passage portion is provided in the fixed portion to communicate with the inside of the hollow fiber membrane through openings at both ends of the hollow fiber membrane. A membrane module for a membrane separation type water purification device, wherein the hollow fiber membranes are arranged in such a posture that the bent portion is at the lower end, and the end portions are arranged inside the bent end portions of the respective hollow fiber membranes. A membrane module for a membrane separation type water purification device, wherein the holding member is inserted and the end holding member is formed as an air diffuser for diffusing air.   The membrane module for a membrane separation type water purification device according to claim 1, wherein an auxiliary air diffuser is disposed below the bent portion of the hollow fiber membrane.   The second auxiliary air diffusing tube is disposed and provided below the bent portion of the hollow fiber membrane between the air diffusing tube and the auxiliary air diffusing tube so as to intersect the air diffusing tube in plan view. A membrane module for a membrane separation type water purification device according to claim 2.   A plurality of diffusion tubes are formed by an upper diffusion tube arranged in parallel and a plurality of lower diffusion tubes arranged in parallel on the lower side of the upper diffusion tube, and the upper diffusion tube and the lower diffusion tube are viewed in a plan view. One pair of hollow fiber membranes that are crossed and one hollow fiber membrane that is opposed to each other out of the four corners formed in plan view by intersecting the upper air diffuser tube and the lower air diffuser tube in plan view. On the inner corner of the pair of hollow fiber membranes so that the other hollow fiber membrane is disposed on the other pair of opposite corners in plan view. The membrane-separated water according to any one of claims 1 to 3, wherein the pair of hollow fiber membranes are crossed below the lower air diffuser by inserting the air diffuser and the lower air diffuser. Membrane module for purification equipment. The fixed portion is formed by including a water passage portion and an air introduction portion surrounding the outside of the water passage portion, and the air introduction portion is communicated with the air diffuser. A membrane module for a membrane separation type water purification device as described in 1.

Images