JP2007083129A - Membrane separation unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a membrane separation unit easily adaptable to the difference of total length of a hollow fiber membrane and outer diameter of a hollow fiber membrane bundle corresponding to various types of tanks having different depth, diameter and shape (cylindrical, prismatic), protecting the hollow fiber membrane from tank aeration, and uniformly aerating. <P>SOLUTION: In this membrane separation unit, a cylindrical socket member 11 is set in a cylindrical pedestal part 9 provided with an aeration tube 10, multiple step part abutting faces 11a, 11b, 11c having different height and outer diameter are provided on the inner periphery of the socket member 11, and a cylindrical binding part 6 with a closed side end part 5a of the multiple hollow fiber membranes 5 fixed thereto is composed so that it is set in the socket member 11 and the lower end face of the binding part 6 abuts on the step part abutting faces 11a, 11b, 11c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, a hollow fiber membrane having one end closed and the other end opened is immersed in the liquid in the treatment tank, and a plurality of the liquids in the treatment tank are filtered and separated by suction from the other open end. The present invention relates to a membrane separation unit having a hollow fiber membrane module.

  Conventionally, in a submerged membrane device in which a membrane unit is immersed in a liquid in a treatment tank to obtain filtered treated water that has permeated the membrane, a coarse bubble diffuser and a fine bubble diffuser below the membrane unit in the treatment tank Have been proposed (see, for example, Patent Document 1). In addition, there has been proposed a structure in which an air diffuser is fixed to a hollow fiber membrane module and integrated (for example, see Patent Document 2). In addition, there has also been proposed a method in which positioning of the membrane separation unit with respect to the position of the membrane separation unit and the installation position in the reaction tank is performed by a guide rod (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 07-185270 Japanese Patent Laid-Open No. 07-136470 Japanese Patent Laid-Open No. 06-218248

  However, when installing a membrane separation unit having a plurality of hollow fiber membrane modules in an existing tank, it is necessary to match the structure of each existing tank, so the tank depth, tank diameter, tank shape (cylindrical type, rectangular tube type) It was necessary to deal with various tanks having different characteristics.

  Also, for example, when decomposing food wastewater sewage sludge, it is necessary to allow bacteria to survive in the treatment tank, so a large amount of air must be aerated in the treatment tank. Since the hollow fiber membrane may be damaged when acting directly, it is necessary to protect the hollow fiber membrane from aeration. On the other hand, when the liquid in the treatment tank is sucked from the open end side of the hollow fiber membrane and the filtered treated water that has permeated through the membrane is filtered and separated, suspended substances adhere to the outside of the hollow fiber membrane and the filtration performance decreases. Therefore, it was necessary to remove suspended substances adhering to the outside of the hollow fiber membrane by diffusing an appropriate amount of air to the outside of the hollow fiber membrane.

  The present invention solves the above-mentioned problems, and the object of the present invention is to provide a total length of the hollow fiber membrane corresponding to various tanks having different tank depths, tank diameters, tank shapes (cylindrical type, rectangular tube type) and the like. It is an object of the present invention to provide a membrane separation unit that can easily cope with the difference in the outer diameter of the hollow fiber membrane bundle and the outer diameter of the hollow fiber membrane bundle, protects the hollow fiber membrane from tank aeration, and makes the membrane aeration uniform.

  The first configuration of the membrane separation unit according to the present invention for achieving the above object is that a hollow fiber membrane having one end closed and the other end opened is immersed in the liquid in the treatment tank, and the other is opened. A membrane separation unit having a plurality of hollow fiber membrane modules for sucking from the end and filtering and separating the liquid in the treatment tank, wherein the closed end portions of the plurality of hollow fiber membranes are fixed and the plurality of hollow fibers A bundling portion provided with a diffuser opening at a predetermined position that avoids a position where the closed end of the membrane is fixed, a pedestal portion provided with a diffuser means, and between the pedestal portion and the bundling portion And a socket member that abuts against the binding portion and receives at least the weight of the plurality of hollow fiber membranes and forms an air chamber below the binding portion.

  According to a second configuration of the membrane separation unit of the present invention, in the first configuration, the socket member is configured to be detachable from the pedestal portion and the binding portion, and is fixed to the binding portion. The plurality of hollow fiber membranes can be changed in accordance with the length or the outer diameter of the bundling portion.

  Moreover, the 3rd structure of the membrane separation unit which concerns on this invention is a said 1st structure. WHEREIN: The said socket member is set to this binding part according to the length of the several hollow fiber membrane fixed to the said binding part. It is characterized by having a height changing means capable of changing the height of the abutting portion that abuts.

  According to a fourth configuration of the membrane separation unit of the present invention, in the first configuration, the socket member has an inner diameter of a fitting portion that fits into the binding portion according to an outer diameter of the binding portion. It has a diameter changing means that can be changed.

  In addition, a fifth configuration of the membrane separation unit according to the present invention is characterized in that, in any of the first to fourth configurations, a partition wall that covers the side surfaces of the plurality of hollow fiber membranes is provided.

  According to the first configuration of the membrane separation unit according to the present invention, the socket member is provided between the bundling portion where the closed end portions of the plurality of hollow fiber membranes are fixed and the pedestal portion provided with the air diffusion means. By interposing, it corresponds to various tanks with different tank depth, tank diameter, tank shape (cylindrical type, rectangular tube type) etc., and the difference in the overall length of the hollow fiber membrane and the difference in the outer diameter of the hollow fiber membrane bundle Each corresponding socket member can be interposed between the bundling portion and the pedestal portion, and can easily cope with the difference in the overall length of the hollow fiber membrane and the difference in the outer diameter of the hollow fiber membrane bundle.

  Since the socket member can contact the bundling portion and receive the weight of the plurality of hollow fiber membranes, the plurality of hollow fiber membranes can be self-supported, for example, the socket member can be fitted to the pedestal and the socket When it is set as the structure which fits a binding part to a member, the horizontal movement at the time of operation | movement of these hollow fiber membranes can be prevented.

  Further, by forming an air chamber below the binding portion by the socket member, air diffused from the air diffusion means provided in the pedestal portion is guided to the air chamber, and an air diffusion opening provided in the binding portion Since the air is uniformly diffused from a part to a plurality of hollow fiber membranes, the hollow fiber membranes can be moderately shaken to peel off suspended substances such as sludge adhering to the surface of the hollow fiber membranes, thereby maintaining filtration performance. I can do it.

  Further, according to the second configuration of the membrane separation unit according to the present invention, the socket member is configured to be detachable from the pedestal portion and the binding portion, and the lengths of the plurality of hollow fiber membranes fixed to the binding portion Alternatively, by being configured to be changeable according to the outer diameter of the binding portion, prepare a plurality of different socket members according to the length of the plurality of hollow fiber membranes fixed to the binding portion or the outer diameter of the binding portion, The socket member can be mounted and installed on the various binding portions and the common base portion, and can be easily detached and replaced.

  Moreover, according to the 3rd structure of the membrane separation unit which concerns on this invention, the height of the contact part which contact | abuts to this binding part according to the length of the some hollow fiber membrane to which a socket member is fixed to a binding part By changing the height of the binding part to which the closed end portions of the plurality of hollow fiber membranes are fixed by the height changing means, the difference in the total length of the hollow fiber membranes is obtained. Can be easily accommodated.

  As a specific example of the height changing means, a step contact surface having a plurality of different diameters is formed on the inner peripheral surface of a cylindrical or rectangular tube shaped socket member, and a bundling portion is inserted into the socket member. The difference in the overall length of the hollow fiber membrane can be easily accommodated by mounting the bundling portion in contact with the step contact surface corresponding to the outer diameter of the bundling portion.

  Moreover, according to the 4th structure of the membrane separation unit which concerns on this invention, it has a diameter change means which can change the internal diameter of the fitting part which a socket member fits to this binding part according to the outer diameter of a binding part. By changing the inner diameter of the fitting portion that is fitted to the binding portion by the diameter changing means according to the outer diameter of the binding portion to which the closed end portions of the plurality of hollow fiber membranes are fixed, the hollow fiber membrane Can easily handle differences in the outer diameter of the bundle.

  As a specific example of the diameter changing means, a stepped contact surface having a plurality of different diameters is formed on the inner peripheral surface of the cylindrical or rectangular tube shaped socket member, and the bundling portion is inserted into the socket member, By attaching the bundling portion in contact with the step contact surface corresponding to the outer diameter of the bundling portion, it is possible to easily cope with the difference in the outer diameter of the hollow fiber membrane bundle.

  Moreover, according to the 5th structure of the membrane separation unit which concerns on this invention, by providing the partition which covers the side surface of a some hollow fiber membrane, several hollow fiber from the opening part for aeration provided in the binding part Diffusion of membrane aeration diffused in the membrane can be suppressed, and the state of aeration to a plurality of hollow fiber membranes can be made uniform. Further, the hollow fiber membrane can be isolated from the bacterial tank aeration and the flow in the tank, and the hollow fiber membrane can be prevented from directly acting on the hollow fiber membrane by the bacterial tank aeration and the flow in the tank. There is no possibility of damaging the membrane, and the hollow fiber membrane can be protected from tank aeration and tank flow.

  An embodiment of the membrane separation unit according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view, a front view, and a side view showing a configuration of a membrane separation unit according to the present invention, FIG. 2 is a diagram showing a piping structure of a hollow fiber membrane bundle of the membrane separation unit according to the present invention, and FIG. 4 is a partial view showing the lower piping structure of the hollow fiber membrane bundle of the membrane separation unit according to FIG. 4, FIG. 4 is a partial view showing the upper piping structure of the hollow fiber membrane bundle of the membrane separation unit according to the present invention, and FIGS. FIG. 8 is a perspective view showing a state in which the side surfaces of a plurality of hollow fiber membranes are covered with partition walls, and FIG. 9 shows an example of a frame structure when the membrane separation unit according to the present invention is installed. FIG.

  1 and 2, reference numeral 1 denotes a membrane separation unit, and a hollow fiber membrane 5 with one end disposed at the upper part open and the other end disposed at the lower part closed is immersed in the liquid in the treatment tank 3. In addition, a plurality of hollow fiber membrane modules 2 for sucking from one end disposed at the opened upper portion and filtering and separating the liquid in the processing tank 3 are configured.

  The membrane separation unit 1 of this embodiment is a unit in which four hollow fiber membrane modules 2 are integrated into a square-shaped gantry 8 made of column beams. The installation interval between the hollow fiber membrane modules 2 incorporated in the gantry 8 is 1.2 times or more the outer diameter of the hollow fiber membrane module 2 in consideration of the shaking of the plurality of hollow fiber membranes 5 in the treatment tank 3 and It is preferable to set it to about twice or less. For example, the pitch between the hollow fiber membrane modules 2 is preferably about 250 mm or more and 300 mm or less.

  When the hollow fiber membrane modules 2 are too close to each other, the adjacent hollow fiber membranes 5 may collide with each other and the hollow fiber membranes 5 may be rubbed. Moreover, since the width of the swing of the hollow fiber membrane 5 is suppressed and the effect of suppressing the adhesion of sludge may be impaired, the installation interval between the hollow fiber membrane modules 2 is 1. It is preferable to set it to 2 times or more, preferably about 1.5 times or more.

  The self-weight of the hollow fiber membrane module 2 is, for example, about 15 kg to 30 kg, and a length in the longitudinal direction of about 1 m to 2 m can be applied.

  The treatment tank 3 of the present embodiment can be applied when, for example, food wastewater sewage sludge is decomposed by the membrane separation unit 1, and a large amount of air is passed into the treatment tank 3 in order to make bacteria survive. An aerator 4 for aeration is provided (see FIG. 8).

  The closed side end portions 5a arranged at the lower portions of the plurality of hollow fiber membranes 5 are fixed to the cylindrical binding portion 6, and a predetermined position of the binding portion 6 that avoids the position where the closed side end portions 5a are fixed. An opening 7 for aeration is provided in the air. On the other hand, a cylindrical pedestal 9 having a diffuser tube 10 serving as a diffuser is provided on the bottom surface of the gantry 8 (see FIG. 3).

  As shown in FIG. 3, a cylindrical socket member 11 is disposed between the base portion 9 and the binding portion 6. The lower portion of the socket member 11 is fitted into the inner peripheral surface of the cylindrical pedestal portion 9, and the binding portion 6 is inserted into the inner peripheral surface of the upper portion of the socket member 11. A step contact surface 11a is formed on the inner peripheral surface of the socket member 11, and the binding portion 6 is fitted into the socket member 11, and the lower end surface of the binding portion 6 is contacted to the step contact surface 11a. As a result of mounting, the socket member 11 receives the weight of the plurality of hollow fiber membranes 5 and forms an air chamber 12 below the stepped contact surface 11a.

  A diffuser tube 10 serving as a diffuser provided in the pedestal portion 9 is led to the air chamber 12, and a diffuser opening provided in the bundling portion 6 by aerating air from the diffuser tube 10. Since the air is uniformly diffused to the outer peripheral surfaces of the plurality of hollow fiber membranes 5 through 7, the hollow fiber membranes 5 are moderately shaken to remove suspended substances such as sludge adhering to the outer peripheral surfaces of the hollow fiber membranes 5. The filter performance can be maintained.

  In addition, a union-type orifice 27 is provided in the middle of each air diffuser 10 for branching air uniformly. The union-type orifice 27 has a structure in which an orifice plate is sandwiched in a union joint. By applying a large pressure loss to the pipes before and after the union-type orifice 27, the union-type orifice 27 is applied to each hollow fiber membrane module 2. A uniform branching of the air diffused from the diffuser tube 10 becomes possible. The union-type orifice 27 has a more compact structure than the flange-type orifice and can be branched.

  By providing the diffuser tube 10 integrally with the membrane separation unit 1, the diffused circulation in the treatment tank 3 can be performed simultaneously with the diffused air to the hollow fiber membrane 5.

  A fixing screw 13 is screwed onto the cylindrical upright piece 9a of the pedestal portion 9, and the socket member 11 is fitted into the upstanding piece 9a of the pedestal portion 9 and fastened with the fixing screw 13, whereby the socket member 11 is fixed. Fixed to the pedestal 9. On the other hand, a fixing screw 13 is similarly screwed into the wall portion above the step contact surface 11a of the socket member 11, and the binding portion 6 is fitted into the socket member 11 so that the lower end surface of the binding portion 6 is inserted. Are attached to the step contact surface 11a, and the fixing screw 13 is fastened to fix the binding portion 6 to the socket member 11.

  The bundling portion 6 abuts on the step portion abutting surface 11 a of the socket member 11 and can receive the weight of the plurality of hollow fiber membranes 5, so that the plurality of hollow fiber membranes 5 can be self-supported, and the pedestal portion 9. The socket member 11 is fitted to the socket member 11 and the bundling portion 6 is fitted to the socket member 11 to prevent the plurality of hollow fiber membranes 5 from moving laterally during operation.

  As shown in FIG. 8, a partition wall 14 made of a face material is provided on the outer periphery of the side surface of the gantry 8, and the side surface of the hollow fiber membrane 5 is covered with the partition wall 14. By providing the partition wall 14 that covers the side surfaces of the plurality of hollow fiber membranes 5, the diffusion of the membrane aeration diffused into the plurality of hollow fiber membranes 5 from the air diffusion openings 7 provided in the binding unit 6 is suppressed. The air diffused state to the plurality of hollow fiber membranes 5 can be made uniform.

  Moreover, the hollow fiber membrane 5 can be isolated from the tank aeration for bacteria and the flow in the tank by ejecting a large amount of air from the aerator 4 by the partition wall 14, and the tank aeration for bacteria and the flow in the tank are the hollow fiber membrane. Therefore, the hollow fiber membrane 5 can be protected from tank aeration and flow in the tank.

  Instead of the partition wall 14 provided on the outer peripheral side portion of the gantry 8, an outer cylinder covering the outer peripheral side portion can be provided for each hollow fiber membrane module 2. When an outer cylinder covering the hollow fiber membrane module 2 is installed for each hollow fiber membrane module 2, the air introduced from the lower part of the hollow fiber membrane module 2 and diffused to the outside of the hollow fiber membrane module 2 during ascending It is possible to remain in the vicinity of the hollow fiber membrane module 2 and the effect of stripping off the sludge of the hollow fiber membrane 5 near the outer periphery of the hollow fiber membrane module 2 is increased. Therefore, diffusion of membrane aeration can be suppressed also by such an outer cylinder, and sludge on the outer peripheral surface of the hollow fiber membrane 5 can be stripped off.

  As shown in FIG. 2, the bundling portion 15 disposed at the top of the hollow fiber membrane 5 is provided with a filtrate discharge opening 16 communicating with the inside of each hollow fiber membrane 5, as shown in FIG. In addition, the flange portion 15 a provided at the upper end portion of the binding portion 15 and the flange portion 17 a of the cap member 17 having an outer peripheral diameter corresponding to the outer peripheral diameter of the binding portion 15 are fastened by the clamp member 18.

  On the other hand, a hose adapter 20 is branched from a liquid collection header 19 provided at the top of the gantry 8, and a flexible hose 22 is connected to the hose adapter 20 by a hose band 21. Further, a ferrule hose adapter 23 is connected to the other end of the flexible hose 22 by a hose band 21, and a flange portion 23 a provided at the lower end portion of the ferrule hose adapter 23 and an upper end portion of the cap member 17 are provided. The flange portion 17 b is fastened by a clamp member 18.

  Then, by sucking from the liquid collection header 19, the treatment liquid in the treatment tank 3 is sucked into the hollow fiber membrane 5 and filtered, and the filtrate flowing through the hollow fiber membrane 5 is collected in the liquid collection header 19. Is done.

  5 and 6, the socket member 11 is configured to be detachable with respect to the pedestal portion 9 and the binding portion 6, and according to the total length of the plurality of hollow fiber membranes 5 fixed to the binding portion 6 and the outer diameter of the binding portion 6. Thus, a plurality of stepped contact surfaces serving as contact portions with which the lower end portion of the bundling portion 6 contacts are provided so as to be changeable.

  That is, the step contact surfaces 11a, 11b, and 11c having different heights and peripheral diameters provided on the inner peripheral wall surface of the socket member 11 correspond to the lengths of the plurality of hollow fiber membranes 5 fixed to the bundling portion 6. A height changing means that can change the height of the step contact surfaces 11a, 11b, and 11c serving as contact portions that contact the binding portion 6 and a fitting portion 6 fitted to the binding portion 6 according to the outer diameter of the binding portion 6. The step portion contact surfaces 11a, 11b, and 11c, which are mating fitting portions, serve as both diameter changing means that can change the inner diameter of the step contact surfaces 11a, 11b, and 11c.

  When the overall length of the hollow fiber membrane 5 is different, the flexible hose 22 provided on the upper part of the hollow fiber membrane module 2 is appropriately expanded and contracted corresponding to the overall length of the hollow fiber membrane 5 to thereby measure the overall length of the hollow fiber membrane 5. The difference can be absorbed.

  When the hollow fiber membrane 5 is changed or replaced, the clamp member 18 is detached as shown in FIG. 4 (b), and the socket member 11 is removed as shown in FIGS. It is possible to easily change or replace the hollow fiber membrane 5 by removing the fixing screw 13 and suspending the hand 17c provided on the cap member 17 to detach the binding portion 6 of the hollow fiber membrane module 2 from the socket member 11. .

  By inserting the socket member 11 between the bundling portion 6 where the closed end portions 5a of the plurality of hollow fiber membranes 5 are fixed and the pedestal portion 9 provided with the air diffuser tube 10, the bath depth and the bath diameter Socket members 11 corresponding to the difference in the overall length of the hollow fiber membrane 5 and the difference in the outer diameter of the bundle of hollow fiber membranes 5 corresponding to various treatment tanks 3 having different tank shapes (cylindrical type, rectangular tube type), etc. It can be interposed between the bundling portion 6 and the pedestal portion 9, and can easily cope with the difference in the overall length of the hollow fiber membrane 5 and the difference in the outer diameter of the bundle of hollow fiber membranes 5.

  Each step contact surface 11a, 11b, 11c of the socket member 11 can contact the lower end surface of the bundling portion 6 and can receive the weight of the plurality of hollow fiber membranes 5, so that the plurality of hollow fiber membranes 5 are self-supporting. It can be made. In particular, when the membrane separation unit 1 is inserted into the activated sludge tank, the sludge gradually adheres to the surface of the hollow fiber membrane 5 and the weight of the hollow fiber membrane module 2 becomes heavy. In the suspended structure, the beam material for suspending and supporting the hollow fiber membrane module 2 is required to have a high strength, so that the structure of the gantry 8 is increased in size and the weight of the membrane separation unit 1 is increased. However, since the upper part of the hollow fiber membrane module 2 may be supported to the extent that the lateral fall is restrained by making the plurality of hollow fiber membranes 5 self-supporting as in the present embodiment, The structure can be reduced in size and the weight of the membrane separation unit 1 can be reduced, so that the overall structure can be reduced in size. Further, since the strength of the water collecting header 19 on the upper part of the hollow fiber membrane module 2 is not required, a plastic flexible hose 22 can be used.

  Further, for example, a cylindrical or rectangular tube-shaped socket member 11 corresponding to the inner peripheral shape of the pedestal portion 9 is fitted into the cylindrical or rectangular tube-shaped pedestal portion 9, and When the cylindrical or rectangular tube-like bundling portion 6 corresponding to the inner peripheral shape of the socket member 11 is fitted, the lateral movement of the plurality of hollow fiber membranes 5 during operation can be prevented. .

  Further, by forming the air chamber 12 below the binding portion 6 by the socket member 11, the air diffused from the air diffusion pipe 10 provided in the pedestal portion 9 is guided to the air chamber 12 and provided in the binding portion 6. Since air is uniformly diffused to the outer peripheral surfaces of the plurality of hollow fiber membranes 5 from the diffused openings 7, the hollow fiber membranes 5 are moderately shaken and suspended such as sludge adhering to the outer peripheral surfaces of the hollow fiber membranes 5. The turbid substance can be peeled off, and the filtration performance by the membrane separation unit 1 can be maintained.

  Further, the socket member 11 is configured to be detachable from the pedestal portion 9 and the binding portion 6, and appropriately according to the length of the plurality of hollow fiber membranes 5 fixed to the binding portion 6 or the outer diameter of the binding portion 6. By being configured to be changeable, a plurality of different socket members 11 corresponding to the length of the plurality of hollow fiber membranes 5 fixed to the bundling portion 6 or the outer diameter of the bundling portion 6 are prepared. They can be mounted and installed on the various binding portions 6 and the common pedestal portion 9, and can be easily detached and replaced.

  Further, a step portion serving as a height changing means capable of appropriately changing the height of the abutting portion in contact with the binding portion 6 according to the total length of the plurality of hollow fiber membranes 5 to which the socket member 11 is fixed to the binding portion 6. By having the contact surfaces 11a, 11b and 11c, the height of the bundling portion 6 to which the closed end portions 5a of the plurality of hollow fiber membranes 5 are fixed becomes step height contact surfaces 11a and 11b which serve as height changing means. , 11c can be appropriately selected and changed to easily cope with the difference in the overall length of the hollow fiber membrane 5.

  In addition, the socket member 11 has stepped contact surfaces 11a, 11b, and 11c as diameter changing means that can change the inner diameter of the fitting portion that fits into the binding portion 6 according to the outer diameter of the binding portion 6. The stepped contact surfaces 11a, 11b, and 11c serving as diameter changing means are appropriately selected according to the outer diameter of the binding portion 6 to which the closed end portions 5a of the plurality of hollow fiber membranes 5 are fixed. By changing the inner diameter of the fitting portion that fits in, it is possible to easily cope with the difference in the outer diameter of the bundle of five hollow fiber membranes.

  7A to 7C, an annular spacer member 28 having an outer peripheral surface corresponding to the inner peripheral surface of the socket member 11 on a step contact surface 11a provided on the inner peripheral surface of the socket member 11 is shown. The spacer member 28 is abutted and fitted, and can be changed according to the length of the plurality of hollow fiber membranes 5 fixed to the binding portion 6 or the outer diameter of the binding portion 6 by appropriately selecting such a spacer member 28. It is a thing.

  The spacer member 28 shown in FIG. 7A abuts against the bundling portion 6 according to the total length of the plurality of hollow fiber membranes 5 fixed to the bundling portion 6 by appropriately selecting the height of the spacer member 28. The spacer member 28 shown in FIG. 7B is configured as a height changing means that can appropriately change the height of the portion. The spacer member 28 shown in FIG. The spacer member 28 having a L-shaped cross section shown in FIG. 7C is configured as a diameter changing means capable of changing the inner diameter of the fitting portion fitted to the binding portion 6 according to the diameter. By appropriately selecting the height or the thickness in the radial direction, both the height changing means and the diameter changing means are used.

  FIG. 9 is a diagram for explaining various installation structures when the membrane separation unit 1 according to the present invention is installed in the processing tank 3, and FIG. 9A is a top beam provided at the upper part of the processing tank 3. This is a cage installation type installation structure in which a frame 25 made of a bowl-shaped frame that can be accommodated by inserting the frame 8 of the membrane separation unit 1 into 24 is suspended. The frame in the vertical direction of the frame 25 also serves as a guide rail for guiding the vertical corners of the frame 8 with L-shaped steel having an L-shaped cross section and guiding the vertical direction in FIG. 9 (a). It is installed in a state where it floats from the tank bottom plate 3a of the processing tank 3 by a predetermined distance.

  FIG. 9B is a tank bottom installation type installation structure in which the frame 25 is placed on the tank bottom plate 3a of the processing tank 3 and attached to the top plate beam 24 provided on the upper part of the processing tank 3. Similarly to the above, the gantry 8 of the membrane separation unit 1 is inserted and accommodated by L-shaped steel having an L-shaped cross section constituting the framing body 25.

  FIG. 9C shows a hanger type installation structure in which the frame 8 of the membrane separation unit 1 is suspended from a beam member 26 provided in the processing tank 3.

A hollow fiber membrane module 2 having a diameter of 150 mm and a length of 2000 mm is set to have a separation pitch of 300 mm and incorporated in the four frame 8, and the membrane separation unit 1 has a height of 2500 mm, a length of 700 mm and a width of 700 mm. create, is immersed membrane separation unit 1 in the processing tank 3 made of food wastewater treatment for activated sludge tank depth 8000mm, film aeration amount from the diffusing pipe 10 is 5Nm ³ /Hr,0.4m ³ / m Stable filtration operation could be continued for 12 months under constant flow rate filtration conditions of ² / Hr.

A hollow fiber membrane module 2 having a diameter of 150 mm and a length of 2000 mm is set to have a separation pitch of 300 mm and incorporated in two frames 8, and the membrane separation unit 1 has a height of 2500 mm, a length of 700 mm, and a width of 200 mm. create, is immersed membrane separation unit 1 in the processing tank 3 made of membrane filtration activated sludge experimental bath depth 3000 mm, film aeration amount from the diffusing pipe 10 is 7Nm ³ /Hr,0.4m ³ / ^{m 2} Stable filtration operation could be continued for 12 months under various constant flow rate filtration conditions of / Hr to 0.8 m ³ / m ² / Hr.

  As an application example of the present invention, a hollow fiber membrane with one end closed and the other end opened is immersed in the liquid in the treatment tank, and the liquid in the treatment tank is filtered and separated by suction from the other open end. The present invention can be applied to a membrane separation unit having a plurality of hollow fiber membrane modules, and particularly applicable to a membrane separation unit having a plurality of hollow fiber membrane modules for filtering and separating liquid in a treatment tank for decomposing food wastewater sewage sludge.

It is the top view, front view, and side view which show the structure of the membrane separation unit which concerns on this invention. It is a figure which shows the piping structure of the hollow fiber membrane bundle of the membrane separation unit which concerns on this invention. It is a fragmentary figure which shows the lower piping structure of the hollow fiber membrane bundle of the membrane separation unit which concerns on this invention. It is a fragmentary figure which shows the upper piping structure of the hollow fiber membrane bundle of the membrane separation unit which concerns on this invention. It is a figure which shows the structure of various socket members. It is a figure which shows the structure of various socket members. It is a figure which shows the structure of various socket members. It is a perspective view which shows a mode that the side surface of the some hollow fiber membrane was covered with the partition. It is a figure which shows an example of the frame structure in the case of installing the membrane separation unit which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Membrane separation unit 2 ... Hollow fiber membrane module 3 ... Processing tank 3a ... Tank bottom plate 4 ... Aerator 5 ... Hollow fiber membrane 5a ... Closure side edge part 6 ... Bundling part 7 ... Aeration opening part 8 ... Base 9 ... Base Part 9a: Standing piece
10 ... Diffuser
11 ... Socket material
11a to 11c ... Step contact surface
12 ... Air chamber
13 ... Fixing screw
14 ... Bulkhead
15 ... Bundling part
15a ... Buttocks
16 ... Filtrate discharge opening
17… Cap member
17a, 17b ... buttocks
17c ... hangers
18… Clamp member
19 ... Collection header
20 ... Hose adapter
21 ... Hose band
22 Flexible hose
23 ... Ferrule hose adapter
23a ... Buttocks
24 ... top plate beam
25 ... Frame
26. Beam material
27… Orifice
28… Spacer member

Claims (5)

A plurality of hollow fiber membrane modules in which a hollow fiber membrane whose one end is closed and the other end is opened is immersed in the liquid in the treatment tank, and the liquid in the treatment tank is filtered and separated by suction from the other open end A membrane separation unit comprising:
A bundling portion provided with a diffuser opening at a predetermined position that avoids a position where the closed side ends of the plurality of hollow fiber membranes are fixed and the closed side ends of the plurality of hollow fiber membranes are fixed;
A pedestal with a diffuser,
A socket member disposed between the pedestal portion and the bundling portion, receiving a weight of at least the plurality of hollow fiber membranes in contact with the bundling portion and forming an air chamber below the bundling portion;
A membrane separation unit comprising: The socket member is configured to be attachable to and detachable from the pedestal portion and the binding portion, and can be changed according to the length of a plurality of hollow fiber membranes fixed to the binding portion or the outer diameter of the binding portion. The membrane separation unit according to claim 1. The socket member has a height changing means capable of changing the height of the abutting portion that abuts on the bundling portion according to the length of the plurality of hollow fiber membranes fixed to the bundling portion. The membrane separation unit according to claim 1. 2. The membrane separation unit according to claim 1, wherein the socket member includes a diameter changing unit capable of changing an inner diameter of a fitting portion fitted to the binding portion according to an outer diameter of the binding portion. The membrane separation unit according to any one of claims 1 to 4, further comprising a partition wall that covers side surfaces of the plurality of hollow fiber membranes.

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