JP2006281198A - Immersion type filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an immersion type filter capable of recovering air for cleaning a hollow fiber membrane supplied to a hollow fiber membrane module in a lower stage to resupply to the hollow fiber membrane module in an upper stage, and suppressing deposition of a suspended substance on the hollow fiber membrane module even in a state of high density filling of the hollow fiber membrane module placed in multistage. <P>SOLUTION: In the immersion type filter in which the hollow fiber membrane module is placed vertically in multistage inside a treatment tank for filtering water containing the suspended substance, a member having a function of recovering air for cleaning the hollow fiber membrane to resupply to the hollow fiber membrane module located on an adjacent upper position is provided as a component member integrally formed with a water collection cap 5 of the hollow fiber membrane module 12 placed downward. Further, the hollow fiber membrane module located at least at adjacent top and bottom as viewed from the upper position is placed so as not to be entirely superimposed mutually. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an immersion type filtration apparatus using a hollow fiber membrane module, and more particularly to an immersion type filtration apparatus in which the flow rate of air for cleaning the hollow fiber membrane is reduced and the running cost is reduced.

  In general, an immersion type filtration apparatus using a hollow fiber membrane module arranges a hollow fiber membrane module in a treated water tank, and sucks and filters raw water containing suspended substances to obtain permeated water.

  Here, in order to increase the amount of water produced per unit site area, it is preferable to arrange so that the hollow fiber membrane module can be densely filled in the water tank, but as disclosed in Patent Document 1, the depth of the water tank It is advantageous if the structure can be arranged in multiple stages according to the hollow fiber membrane module.

  Furthermore, as disclosed in Patent Document 1, if the hollow fiber membrane cleaning air supplied to the lower hollow fiber membrane module can be recovered and re-supplied to the upper hollow fiber membrane module, the air supply amount decreases. This has the effect of reducing running costs.

  However, for example, when a hood-like air introduction tube is provided at the lower part of the upper hollow fiber membrane module as disclosed in Patent Document 1, in order to collect almost all of the air supplied to the lower hollow fiber membrane module As shown in FIG. 19, it is necessary to increase the diameter (F) of the air introduction cylinder 6. This is because all the air supplied to the lower hollow fiber membrane module 12 does not move upward between the hollow fiber membranes, but moves around the outer periphery of the hollow fiber membrane bundle as shown by the arrow G in FIG. This is because a part of the water flows out of the system of the hollow fiber membrane module and dissipates before reaching the upper part of the lower hollow fiber membrane module 12. In particular, the air that has flowed out of the system from a relatively lower position of the hollow fiber membrane module may move away from the hollow fiber membrane module as it moves upward.

  As a result, in order to collect almost all of the air supplied to the lower hollow fiber membrane module 12, the air introduction cylinder 6 needs to be enlarged, and the distance between adjacent hollow fiber membrane modules is increased. The water tank cannot be filled with the hollow fiber membrane module at a high density, and there is no merit that the hollow fiber membrane modules described above can be arranged in multiple stages and filled at a high density.

Further, as disclosed in Patent Document 1, when the hollow fiber membrane modules at each stage are arranged so as to overlap each other when viewed from above, the suspension discharged from the upper hollow fiber membrane module 11 is disposed. Suspended substances fall and deposit on the lower hollow fiber membrane module 12 just below, and the accumulated suspended substances are sucked together with raw water during the filtration process and are taken into the upper and lower hollow fiber membrane modules again. Therefore, there is a possibility that the filtration performance is lowered.
JP 2004-290735 A

  The object of the present invention is to solve the above-mentioned conventional problems and maintain the lower hollow fiber membrane module even in a state where the hollow fiber membrane modules are densely packed in the treated water tank while keeping the distance between adjacent hollow fiber membrane modules small. An object of the present invention is to provide a submerged filtration device that can recover the air for cleaning the hollow fiber membrane supplied to the tube and re-supply it to the upper hollow fiber membrane module, and further suppress the accumulation of suspended substances in the hollow fiber membrane module. Is.

  The hollow fiber membrane module of the present invention that achieves the above object is characterized by the following configuration.

  (1) A hollow fiber membrane bundle composed of a plurality of hollow fiber membranes, a resin plate in which both ends of the hollow fiber membrane bundle are bonded and converged, and a water collecting cap provided on one resin plate portion of the resin plate The suspended substance is removed by using a hollow fiber membrane module having an air supply portion arranged on one side of the other resin plate portion of the resin plate, and an air introduction tube provided in the air supply portion. A submerged filtration device for filtering water containing the hollow fiber membrane, wherein the hollow fiber membrane modules are arranged in multiple stages in a vertical direction in a treated water tank for filtering water containing suspended substances, and are arranged below. The submerged filtration device, wherein the constituent members of the membrane module have a function of collecting air for cleaning the hollow fiber membrane and re-supplying it to the adjacent hollow fiber membrane module disposed above.

  (2) The submerged filtration device according to (1), wherein the constituent member is formed integrally with a water collecting cap.

  (3) Either of the above (1) or (2), wherein the hollow fiber membrane modules positioned at least adjacently above and below are arranged so as not to overlap each other when viewed from above The immersion type filtration apparatus as described.

  (4) In the hollow fiber membrane module, a through hole is provided in the resin plate on the air supply unit side, and when the cross-sectional area of the air supply unit is S, 0. The submerged filtration device according to any one of (1) to (3), wherein the through hole is provided only in a region corresponding to 5S.

  (5) Of the hollow fiber membrane modules arranged in multiple stages in the vertical direction, at least the hollow fiber membrane module other than the lowest hollow fiber membrane module is provided with a single through hole near the center of the resin plate on the air supply unit side. The submerged filtration device according to the above (3) or (4), which is a hollow fiber membrane module.

  (6) Of the hollow fiber membrane modules arranged in multiple stages in the vertical direction, at least the hollow fiber membrane module other than the lowest hollow fiber membrane module is larger than other through holes in the vicinity of the central portion of the resin plate on the air supply unit side. It is a hollow fiber membrane module provided with the through-hole which has an opening area, The immersion type filtration apparatus as described in said (3) or (4) characterized by the above-mentioned.

  (7) A hollow fiber membrane bundle composed of a plurality of hollow fiber membranes, an adhesive portion A in which the end surfaces of the hollow fiber membranes are bonded and converged, and an adhesive portion B in which the end surfaces of the hollow fiber membranes are closed together in units of small bundles A submersible filtration device that filters water containing suspended solids using a hollow fiber membrane module having a water collecting cap provided in the adhesive part A and an air introduction tube provided around the adhesive part B. The hollow fiber membrane module is arranged in multiple stages in the vertical direction in the treated water tank for filtering the water containing the suspended substance, and the constituent members of the hollow fiber membrane module arranged below are the hollow fiber membrane cleaning A submersible filtration device having a function of collecting air for supply and re-supplying it to the adjacent hollow fiber membrane module disposed above.

  (8) The submerged filtration device according to (7), wherein the constituent member is formed integrally with a water collecting cap.

  (9) The structure according to any one of (7) and (8), wherein when viewed from above, the hollow fiber membrane modules positioned at least adjacently above and below are arranged so as not to overlap each other. Immersion type filtration device.

  (10) The immersion type filtration device according to any one of (1) to (9), wherein the hollow fiber membrane modules constituting the immersion type filtration device are arranged in two to four stages in the vertical direction.

  According to the present invention, in the immersion type filtration device in which the hollow fiber membrane modules are arranged in multiple stages in the vertical direction, the hollow fiber membranes for washing the hollow fiber membranes supplied to the lower hollow fiber membrane modules in a state where the hollow fiber membrane modules are packed in high density Since air can be collected and re-supplied to the upper hollow fiber membrane module, it is possible to simultaneously achieve both an increase in the amount of water produced per unit site area and a reduction in running costs due to a decrease in the air supply amount. Furthermore, it is possible to suppress the accumulation of suspended substances on the hollow fiber membrane module.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of the present invention will be described below with reference to the drawings, taking as an example a case where it is applied as a submersible filtration device for clean water. FIG.1 and FIG.2 is a schematic sectional drawing which respectively shows the embodiment of the hollow fiber membrane module 1 which comprises the immersion type filtration apparatus which concerns on this invention. In this hollow fiber membrane module, a hollow fiber membrane bundle 2 in which hundreds to tens of thousands of hollow fiber membranes are bundled and arranged in a fixed length is accommodated in a cylindrical case 3, with both ends being resin plates 4a, It is preferable that the adhesive is converged at 4b and fixed to the cylindrical case. And the part which is not adhesively converged by the resin plates 4a and 4b between the adhesive converging parts becomes the filtration region part. Here, it is preferable that the cylindrical case 3 has, for example, a net shape and is in a state capable of passing water. This is one reason that the resistance of the suction filtration can be greatly reduced by taking the raw water in the treated water tank into the hollow fiber membrane module 1 from the entire surface of the cylindrical case 3. On the contrary, when the hollow fiber membrane is washed, the suspended substance adhering to the surface of the hollow fiber membrane can be discharged out of the hollow fiber membrane module 1 through the entire surface of the cylindrical case 3 through which water can flow. Emission efficiency is improved.

  The material of the hollow fiber membrane constituting the hollow fiber membrane bundle 2 is not particularly limited. Polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, ethylene -Vinyl alcohol copolymer, cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, etc., and composite materials thereof can be exemplified.

  The hollow fiber membrane preferably has an outer diameter in the range of 0.3 to 3 mm. This is because if the outer diameter of the hollow fiber membrane is too small, the hollow fiber membrane will break during handling of the hollow fiber membrane when manufacturing the hollow fiber membrane module, and during filtration and washing when using the hollow fiber membrane module. This is because, if the outer diameter is too large, the number of hollow fiber membranes that can be inserted into a cylindrical case of the same size decreases and the filtration area decreases. The hollow fiber membrane preferably has a thickness in the range of 0.1 to 1 mm. If the film thickness is too small, there is a problem that the film is broken by pressure, and conversely, if the film thickness is large, there is a problem that the pressure loss and the cost of raw materials are increased.

  The hollow fiber membranes are bonded and focused only between the hollow fiber membranes by the resin plate 4a on the side of the water collecting cap 5, and the end surfaces of the hollow fiber membranes are open. On the other hand, on the air introduction tube 6 side, the resin plate 4b penetrates to the inside of the hollow fiber membrane, and the hollow fiber membranes are bonded and focused together, and the end surface of the hollow fiber membrane is also sealed. On the air introduction tube 6 side, a plurality of through-holes 8 penetrating in the axial direction of the hollow fiber membrane module are provided in the adhesively solidified resin plate 4b. The cross-sectional shape of the through hole 8 may be arbitrary, such as a circle, an ellipse, or a polygon.

  As for the resin plates 4a and 4b that bond and bundle the hollow fiber membrane bundle, it is preferable to use a polymer material such as an epoxy resin, a urethane resin, or an epoxy acrylate resin that is a general-purpose product and is inexpensive and does not affect the water quality.

  Next, a water collection cap 5 and an air introduction tube 6 are mounted on the resin plates 4a and 4b at both ends, respectively. According to the present invention, as shown in FIG. 2, the structural member having a function of collecting air for cleaning the hollow fiber membrane 1 and resupplying it to the adjacent hollow fiber membrane module disposed above the hollow fiber membrane module 1. 20 may be attached separately, but more preferably, as in the embodiment shown in FIG. 1, if the constituent members are formed integrally with the water collecting cap 5, the manufacturing cost can be reduced by reducing the number of members, Miniaturization of the thread membrane module can be realized. In the present embodiment shown in FIG. 1, the water collection cap 5 is provided with an air recovery port 9 and an air supply port 10 in addition to the filtered water outlet 7. Here, although the A arrow top view of the water collection cap 5 is shown in FIG. 3, the air supply port 10 is provided in the specific position for the reason mentioned later.

  Examples of the material of the cylindrical case 3, the water collecting cap 5, and the air introducing cylinder 6 include polyolefins such as polyethylene, polypropylene, polybutene, polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), tetrafluoroethylene, Fluorine-based resins such as propylene hexafluoride (FEP), ethylene tetrafluoride ethylene (ETFE), ethylene trifluoride chloride (PCTFE), ethylene trifluoride ethylene chloride (ECTFE), vinylidene fluoride (PVDF), And chlorine resin such as polyvinyl chloride and polyvinylidene chloride, polysulfone resin, polyether sulfone resin, polyallyl sulfone resin, polyphenyl ether resin, acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylonitrile-styrene copolymer Combined resin Polyphenylene sulfide resins, polyamide resins, polycarbonate resins, polyether ketone resins, polyether ether ketone resin is used alone or in combination. Other than the resin, aluminum, stainless steel, and the like are preferable, and a composite material such as a resin-metal composite, a glass fiber reinforced resin, and a carbon fiber reinforced resin may be used. The cylindrical case 3, the water collecting cap 5, and the air introducing cylinder 6 may be made of the same material or different materials.

  Next, an example of a raw water treatment method when the hollow fiber membrane module is arranged in two stages in the vertical direction to form an immersion type filtration apparatus will be described with reference to FIG. FIG. 4 shows a configuration in which the hollow fiber membrane modules 1 shown in FIG. 1 are arranged in two stages.

  First, the hollow fiber membrane module is immersed in a water tank (not shown). Raw water containing suspended solids is placed in the aquarium, and it is sucked from the filtered water outlet 7 side of the hollow fiber membrane module by a pump or the like, and from the outside of the cylindrical case 3 through which raw water containing suspended solids can be passed. After taking in in a hollow fiber membrane module and filtering using the hollow fiber membrane bundle 2, it sends to the water collection pipe | tube which is not shown in figure from the filtrate water outlet 7. FIG. At this time, the suspended matter in the raw water adheres to the surface of the hollow fiber membrane. Further, when the raw water is sucked and filtered water is taken out of the water tank, the water level of the water tank is lowered, so that the raw water is supplied into the water tank as necessary. When the filtration process for a certain period of time is completed, this time, backwashing of filtered water or compressible gas from the filtered water outlet 7 side to the raw water side, or an air diffuser pipe (shown in the figure below) of the lower hollow fiber membrane module 12 is performed. No) is performed, and air scrubbing is performed in which a compressible gas is supplied into the hollow fiber membrane module through the through-hole 8 at the bottom of the hollow fiber membrane module 12 and the suspended substances accumulated in the hollow fiber membrane module are discharged out of the system. . First, in backwashing, filtered water or a compressible gas flows from the inside of the hollow fiber membrane toward the outside, so that the suspended substance attached to the surface of the hollow fiber membrane is peeled off from the surface of the hollow fiber membrane. In the next air scrubbing, first, fine suspended substances inside the lower hollow fiber membrane module 12 are discharged to the outside through the cylindrical case 3 through which water can flow by the air supplied to the lower hollow fiber membrane module 12. Discharged. Then, the air for washing the hollow fiber membrane used in the lower hollow fiber membrane module 12 flows into the air recovery port 9 provided in the water collecting cap 5 as indicated by the arrow C, and then as indicated by the arrow D. From the air supply port 10 to the air introduction cylinder 6 of the upper hollow fiber membrane module 11 and is discharged out of the system through the cylindrical case 3 through which fine suspended substances in the upper hollow fiber membrane module 11 can flow. To do.

  The discharged suspended matter floats in the water tank and then falls toward the bottom of the water tank after a certain amount of time. On the other hand, a suspended substance having a relatively large mass such as deposited and solidified in the hollow fiber membrane module falls through the through hole 8 toward the bottom surface of the water tank after air scrubbing. And the raw | natural water in a water tank is drained regularly, and the suspended solid deposited on the bottom face is discharge | released out of a water tank.

  The treatment of raw water is continued for a long time while repeating these steps.

  And according to this invention, in the said air scrubbing, as shown by the arrow C of FIG. 4, the air which flowed out from the lower hollow fiber membrane module 12 is a component of the lower hollow fiber membrane module 12 before dissipating. Is collected at an air collection port 9 provided in the water collecting cap 5 and is supplied from the air supply port 10 to the upper hollow fiber membrane module 11 directly above, so that the air introduction tube of the upper hollow fiber membrane module 11 is provided. The diameter of 6 can be significantly smaller than that in the prior art shown in FIG. As a result, the distance between adjacent hollow fiber membrane modules can be reduced, so that high-density filling of the hollow fiber membrane modules becomes possible.

  Here, in consideration of the outflow of air from the entire circumference of the hollow fiber membrane module, the air recovery port 9 is preferably provided on the entire circumference of the water collecting cap 5. The air supply port 10 is preferably provided at a specific position as described later. Furthermore, since the hollow fiber membrane cleaning air is collected and re-supplied here using the water collecting cap 5 which is a component of the hollow fiber membrane module, the function of collecting and re-supplying the hollow fiber membrane cleaning air is provided. Compared with the case where the member having the above is separately manufactured and attached to the hollow fiber membrane module, the manufacturing cost can be reduced and the hollow fiber membrane module can be downsized. However, if the effect of the present invention is achieved, the hollow fiber membrane module can be made hollow. A member having a function of collecting and re-supplying the yarn membrane cleaning air may be separately manufactured and attached to the hollow fiber membrane module.

Further, FIG. 5 shows a bottom view of FIG. In FIG. 5, when the cross-sectional area of the resin plate 4b portion that is the air supply portion 18 is S (including the cross-sectional area of the through-hole), the through-hole 8 that supplies the air for cleaning the hollow fiber membrane is the central portion of the resin plate 4b portion. It should be provided only in the nearby 0.5S region (the region surrounded by the one-dot chain line). Here, the shapes of the S region and the 0.5S region are substantially similar to each other. Here, “substantially similar” means that the ratio (L _S / L _0.5S ) of the distance (L _S , L _0.5S ) between any two corresponding points at the boundary of the region S and the boundary of the region 0.5S. the maximum value of _{0.5S) (η MAX = (L} S / L 0.5S) is _MAX) and minimum value _{(η MIN = (L S /} L 0.5S) ratio _{MIN) (η MIN / η MAX} ) It refers to the case of 0.9 or more.

  In the above-described prior art, of the hollow fiber membrane cleaning air supplied from the through hole 8, a part of the air that moves near the outer peripheral portion of the hollow fiber membrane bundle 2 reaches the hollow fiber membrane before reaching the upper part of the hollow fiber membrane module. The efficiency of air utilization is poor because it flows out of the membrane module system. However, in the hollow fiber membrane module 1 of the present invention, the air supplied from the through holes 8 is concentrated near the center of the hollow fiber membrane bundle 2, so that the supplied air reaches the resin plate 4a. It moves through the hollow fiber membrane bundle 2 without flowing out from the normal case 3 through which water can flow, and flows out through the cylindrical case 3 through which water can flow only after reaching the resin plate 4a, as indicated by an arrow C in FIG. Thus, as soon as it flows out, it flows into the air recovery port 9. For this reason, since almost all of the hollow fiber membrane cleaning air supplied to the lower hollow fiber membrane module 12 is recovered and supplied to the upper hollow fiber membrane module 11, the use efficiency of air is greatly improved. .

  Here, the cross-sectional shape of the hollow fiber membrane module is a circle, but it may be an ellipse, a polygon such as a triangle, a quadrangle, or a pentagon. Further, for example, the arrangement of the through holes in the case of a quadrangle is shown in FIG. .5S region (region surrounded by alternate long and short dash lines). At this time, the region of 0.5S was kept in a similar shape without rotating the outer shape (solid line part) of the air supply unit 18 starting from the center 19 of the air supply unit shown in FIG. It is preferable that the cross-sectional area be reduced to 0.5 S in the state (the wavy line portion).

  The hollow fiber membrane module can be installed in two stages by installing it in a module rack 13 provided with a guide 14 as shown in FIG. 7, or by attaching a hook attached to the upper part of the hollow fiber membrane module as shown in FIG. 15 can be illustrated as being inserted into a rail 16 installed at the top of each stage of the module rack 13, but other methods may be used. Furthermore, the hollow fiber membrane module may be installed in three or more stages in the vertical direction. In this case as well, in the same manner as described above, except for at least the uppermost hollow fiber membrane module, it is preferable to have a function of collecting the air for cleaning the hollow fiber membrane, and the through hole is preferably provided only in the center of the air supply unit. .

  Furthermore, as shown in FIG. 9, the more preferable embodiment of the present invention is that the upper hollow fiber membrane module 11 and the lower hollow fiber membrane module 12 as adjacent steps overlap each other when viewed from above. Is to be arranged so that there is no. Here, being arranged so as not to overlap means that the central axis of the hollow fiber membrane module is arranged so as not to overlap the cross section of another hollow fiber membrane module. A schematic view of the arrangement of the hollow fiber membrane modules as viewed from above is shown in FIG. The outline drawing of the lower hollow fiber membrane module 12 is represented by the wavy line, and the outline drawing of the upper hollow fiber membrane module 11 is shown by the solid line. As shown in the figure, the lower hollow fiber membrane module 11 is shown. The 12 air supply ports 10 are preferably installed in a portion overlapping the upper hollow fiber membrane module 11. Thereby, all the air flowing out from the air supply port 10 is supplied to the air introduction cylinder 6 of the upper hollow fiber membrane module 11. Further, when viewed from above, the upper hollow fiber membrane module 11 and the lower hollow fiber membrane module 12 which are adjacent to each other are arranged so as not to overlap each other, so that as shown by an arrow E in FIG. Most of the suspension material having a relatively large mass discharged from the through-hole 8 of the hollow fiber membrane module 11 falls into the gap between the lower hollow fiber membrane modules 12, so that the suspended material is in the lower hollow fiber membrane module. Accumulation on 12 water collecting caps or the like can be suppressed.

  Furthermore, in FIG. 9, it is preferable that the through holes in the resin plate 4b portion of the upper hollow fiber membrane module 11 are arranged as shown in FIGS. FIG.11 and FIG.12 is the schematic diagram (perspective view) which looked at the resin board 4b part from diagonally downward. As shown in FIG. 11, at least the upper hollow fiber membrane module 11 is preferably provided with a through hole 17 only at the center of the resin plate 4b portion. This is because the hollow fiber membrane module 12 adjacent to the lower side is not installed directly below the central through-hole 17, so that all of the suspended matter discharged from the through-hole 17 has a relatively large mass. It is because it can further suppress that it falls to the water collection cap 5 etc. of a lower hollow fiber membrane module.

  Furthermore, considering that the through hole is a suspended substance discharge port and an air diffuser port at the time of air scrubbing, for example, as shown in the schematic diagram of FIG. After providing the through-hole 8 having the same opening area so that the entire surface of the hollow fiber membrane bundle 2 can be diffused, the central portion is provided with a central through-hole 17 having an opening area that is twice or more larger than the other, for example. It is also convenient to concentrate the discharge of the suspension material having a relatively large mass in the central part.

  Also in these cases, the hollow fiber membrane module can be installed in two stages by installing it in a module rack 13 provided with a guide 14 as shown in FIG. 9 or in the upper part of the hollow fiber membrane module as shown in FIG. For example, the attached hook 15 may be inserted into a rail 16 installed at the upper part of each stage of the module rack 13, but other methods may be used.

  In the above embodiment, the hollow fiber membrane modules are arranged in two stages in the vertical direction. Similarly, FIG. 14 shows a schematic diagram when the hollow fiber membrane modules are arranged in three stages in the vertical direction, and the arrangement of the hollow fiber membrane modules when viewed from above. Schematic diagrams are shown in FIG. In FIG. 15, the outline of the hollow fiber membrane module arranged at the lowermost stage is represented by a wavy line, the outline drawing of the hollow fiber membrane module arranged at the second stage from the bottom, and one point What is indicated by a chain line is an external view of the hollow fiber membrane module arranged in the third row from the bottom. Also in this case, the adjacent hollow fiber membrane modules located above and below, that is, the lowermost hollow fiber membrane module and the second lower hollow fiber membrane module, and the second lower hollow fiber membrane module and the lower hollow fiber membrane module. The third stage hollow fiber membrane modules are arranged so as not to overlap each other. Further, as shown in FIG. 15, when the three members of the lowermost hollow fiber membrane module, the second lowest hollow fiber membrane module, and the third lower hollow fiber membrane module are not overlapped with each other, Further preferred.

  Furthermore, the air supply port of the lowermost hollow fiber membrane module is installed in a portion overlapping the second-stage hollow fiber membrane module from the bottom, and the air supply port of the second-stage hollow fiber membrane module from the bottom is three stages from the bottom It is preferable to install in the part which overlaps the hollow fiber membrane module of eyes.

  Next, similarly, FIG. 16 shows a schematic diagram when the hollow fiber membrane modules are arranged in four stages in the vertical direction, and FIG. 17 shows a schematic diagram of the arrangement of the hollow fiber membrane modules when viewed from above. In FIG. 17, the outline drawing of the hollow fiber membrane module arranged at the lowest level is shown by the wavy line, and the outline drawing of the hollow fiber membrane module arranged at the second level from the bottom is shown by the solid line. Further, the outline of the hollow fiber membrane module arranged at the third stage from the bottom is shown by a one-dot chain line, and the outline of the hollow fiber membrane module arranged at the fourth stage from the bottom is shown by a two-dot chain line. FIG. Similarly, in this case, the adjacent hollow fiber membrane modules are located between the lowermost hollow fiber membrane module, the bottom second hollow fiber membrane module, and the second bottom hollow fiber membrane module. The third-stage hollow fiber membrane module from the bottom, the third-stage hollow fiber membrane module from the bottom, and the fourth-stage hollow fiber membrane module are arranged so as not to overlap each other. In addition, as shown in FIG. 17, the hollow fiber membrane module at the lowest level, the hollow fiber membrane module at the second level from the bottom, the hollow fiber membrane module at the third level from the bottom, and the hollow fiber membrane module at the fourth level from the bottom It is further preferable that the four members do not overlap each other. Furthermore, the air supply port of the lowermost hollow fiber membrane module is installed in a portion overlapping the second-stage hollow fiber membrane module from the bottom, and the air supply port of the second-stage hollow fiber membrane module from the bottom is three stages from the bottom It is preferable to install in the portion overlapping with the hollow fiber membrane module of the eye, and the air supply port of the third hollow fiber membrane module from the bottom is installed in the portion overlapping with the fourth hollow fiber membrane module from the bottom.

  Even when the hollow fiber membrane modules are arranged in three or four stages in the vertical direction as described above, the adjacent hollow fiber membrane modules do not overlap each other, so that Most of the suspension material with a relatively large mass discharged from the upper hollow fiber membrane module falls into the gap between the adjacent lower hollow fiber membrane modules. Accumulation on the water collecting cap of the yarn membrane module can be suppressed. Furthermore, if the hollow fiber membrane modules at each stage do not overlap each other, most of the suspended matter with a relatively large mass discharged from the hollow fiber membrane module located at the upper part of the hollow fiber membrane module is located at the lower part of the hollow fiber membrane module located at the lower part. Since the gap between the thread membrane modules falls to reach the bottom of the water tank, the effect of suppressing the accumulation of suspended substances on the water collection cap or the like is even greater.

  As described above, when the hollow fiber membrane modules are installed in two to four stages, the hollow fiber membrane modules are more preferable because it is easy to adopt a configuration in which the hollow fiber membrane modules in each stage do not overlap each other. Even when five or more are arranged in the vertical direction, the effect of the present invention can be obtained by arranging the hollow fiber membrane modules adjacent in the vertical direction so as not to overlap each other.

  Even when the hollow fiber membrane module is installed in three or four stages in the vertical direction, a hook attached to the upper part of the hollow fiber membrane module is attached to the top of the module rack in the same manner as described above other than shown in FIGS. It does not matter if it is installed on a rail installed at the top of each stage.

  Further, the hollow fiber membrane module 1 keeps the distance between the resin plate 4a and the resin plate 4b constant by a cylindrical case 3 through which water can pass. This is because if the distance between the two is variable, the hollow fiber membrane may be stretched or bent and damaged, but if the strength of the hollow fiber membrane is high, the cylindrical case 3 It does not matter if there is no. Further, instead of the cylindrical case 3, both ends of a rod-like object or the like may be bonded to the resin plate 4 a and the resin plate 4 b to keep the distance between the resin plate 4 a and the resin plate 4 b constant.

  Further, the above description has been made on the hollow fiber membrane module in which both ends of the hollow fiber membrane bundle are bonded and focused by the resin plates 4a and 4b and fixed to the cylindrical case 3, but the hollow fiber used in the present invention is used. As shown in FIG. 18, in the membrane module, the upper adhesive portion A21a is bonded and focused with the end face of the hollow fiber membrane opened in the same manner as described above, and fixed to the cylindrical case 3, and the lower adhesive portion B21b. The hollow fiber membrane is divided into a plurality of small bundles 22 and bonded in a state in which the end surface of the hollow fiber membrane is closed, and the hollow fiber membrane may be not fixed to the cylindrical case 3. . In this case, the suspended substance peeled off from the outer surface of the hollow fiber membrane during backwashing or air scrubbing is discharged from the air introduction tube 6 to the lower side of the hollow fiber membrane module 1 through the gaps between the plurality of freely moving adhesive portions B21b. Since it is easy, a suspended substance is hard to deposit in the hollow fiber membrane module 1, and it is preferable because the raw water can be treated without lowering the filtration performance over a long period of time.

  The immersion type filtration apparatus in which the hollow fiber membrane modules of the present invention are arranged in multiple stages is preferably applied to water use, but can also be applied to sewage use, industrial water use, and the like. is not.

It is a schematic longitudinal cross-sectional view which shows an example of the hollow fiber membrane module used by this invention. It is a schematic longitudinal cross-sectional view which shows another example of the hollow fiber membrane module used by this invention. It is an A arrow top view in FIG. It is a schematic longitudinal cross-sectional view which shows an example of the immersion type filtration apparatus which concerns on this invention. It is a B arrow bottom view in FIG. It is the schematic (plan view) which shows the example of arrangement | positioning of a through-hole in case the cross-sectional shape of a hollow fiber membrane module is a square. It is a schematic longitudinal cross-sectional view which shows an example of hollow fiber membrane module arrangement | positioning in the immersion type filtration apparatus which concerns on this invention. It is a schematic longitudinal cross-sectional view which shows another example of the immersion type filtration apparatus which concerns on this invention. It is a schematic diagram (perspective view) which shows another example of hollow fiber membrane module arrangement | positioning in the immersion type filtration apparatus which concerns on this invention. It is the schematic (plan view) explaining arrangement | positioning of the hollow fiber membrane module in FIG. It is a schematic diagram (perspective view) which shows an example of arrangement | positioning of the through-hole in a lower resin board part. It is a schematic diagram (perspective view) which shows another example of arrangement | positioning of the through-hole in a lower resin board part. It is a schematic longitudinal cross-sectional view which shows another example of hollow fiber membrane module arrangement | positioning in the immersion type filtration apparatus which concerns on this invention. It is a schematic diagram which shows another example of hollow fiber membrane module arrangement | positioning in the immersion type filtration apparatus which concerns on this invention. It is the schematic (plan view) explaining arrangement | positioning of the hollow fiber membrane module in FIG. It is a schematic diagram which shows another example of hollow fiber membrane module arrangement | positioning in the immersion type filtration apparatus which concerns on this invention. It is the schematic (plan view) explaining arrangement | positioning of the hollow fiber membrane module in FIG. It is a schematic longitudinal cross-sectional view which shows another example of the hollow fiber membrane module used by this invention. It is a schematic longitudinal cross-sectional view which shows the conventional immersion type filtration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane module 2 Hollow fiber membrane bundle 3 Cylindrical case 4a, 4b Resin board 5 Water collecting cap 6 Air introduction cylinder 7 Filtrated water outlet 8 Through hole 9 Air collection | recovery port 10 Air supply port 11 Upper hollow fiber membrane module 12 Lower hollow fiber membrane module 13 Module rack 14 Guide 15 Hook 16 Rail 17 Through hole (central through hole)
18 Air Supply Part 19 Center of Air Supply Part 20 Component 21a Bonding Part A
21b Bonded part B
22 Small bundle

Claims (10)

A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes, a resin plate in which both ends of the hollow fiber membrane bundle are bonded and converged, a water collecting cap provided on one resin plate portion of the resin plate, and the resin Water containing suspended solids is produced using a hollow fiber membrane module having an air supply portion arranged on one side of the other resin plate portion of the plate and an air introduction tube provided in the air supply portion. A submerged filtration device for filtering, wherein the hollow fiber membrane module is arranged in multiple stages in a vertical direction in a treated water tank for filtering water containing suspended solids, and the hollow fiber membrane module arranged below The submerged filtration apparatus, wherein the constituent member has a function of collecting air for cleaning the hollow fiber membrane and resupplying it to the adjacent hollow fiber membrane module disposed above. The immersion filter device according to claim 1, wherein the component member is formed integrally with a water collecting cap. The immersion filter device according to claim 1 or 2, wherein the hollow fiber membrane modules positioned at least vertically adjacent to each other when viewed from above are arranged so as not to overlap each other. The hollow fiber membrane module has a through hole in the resin plate on the air supply unit side, and a region corresponding to 0.5S in the center of the air supply unit when the cross-sectional area of the air supply unit is S The immersion filter according to any one of claims 1 to 3, wherein the through-hole is provided only in the filter. Of the hollow fiber membrane modules arranged in multiple stages in the vertical direction, at least other than the lowest hollow fiber membrane module, a single through hole is provided near the center of the resin plate on the air supply unit side. It is a hollow fiber membrane module, The immersion type filtration apparatus of Claim 3 or 4 characterized by the above-mentioned. Of the hollow fiber membrane modules arranged in multiple stages in the vertical direction, at least other than the hollow fiber membrane module at the lowest stage, an opening area larger than other through holes is provided near the center of the resin plate on the air supply unit side. It is a hollow fiber membrane module provided with the through-hole which has, The immersion type filtration apparatus of Claim 3 or 4 characterized by the above-mentioned. A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes, an adhesive portion A in which the hollow fiber membrane end face is opened and converged, an adhesive portion B in which the hollow fiber membrane end faces are closed together in small bundle units, and an adhesive portion A submersible filtration device that filters water containing suspended matter using a hollow fiber membrane module having a water collection cap provided in A and an air introduction tube provided around an adhesive portion B, The hollow fiber membrane module is arranged in multiple stages in the vertical direction in a treated water tank for filtering water containing suspended substances, and the components of the hollow fiber membrane module arranged below are air for washing the hollow fiber membrane. A submerged filtration device having a function of recovering and re-supplying to a hollow fiber membrane module disposed above and adjacent thereto. The immersion filter device according to claim 7, wherein the component member is formed integrally with a water collecting cap. 9. The immersion type filtration apparatus according to claim 7, wherein the hollow fiber membrane modules positioned at least vertically adjacent to each other when viewed from above are arranged so as not to overlap each other. The submerged filtration apparatus according to any one of claims 1 to 9, wherein the hollow fiber membrane modules constituting the submerged filtration apparatus are arranged in two to four stages in the vertical direction.

Images