JP2008055376A - Solid-liquid separator, membrane module for solid-liquid separator and connection member for solid-liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-liquid separator, a membrane module and a connection member which are light, compact, absorbable of a dimension error, and also cheaper, can make the connection member and a housing of the membrane module or a liquid collecting header slidable to connect them liquid-tightly, easily and surely, controls receiving attrition and scaring, and can stably carry out a solid-liquid separation treatment over the long term. <P>SOLUTION: The connection member for the solid-liquid separator connects the membrane module which has a lot of hollow fibers with the liquid permeability arrayed in parallel and a pair of housings integratedly fixed so that both end parts of the fibers are contained inside, respectively, and the liquid collecting header for collecting a filtrate after a liquid to be treated is made to permeate the hollow fibers by an aspirator so that a solid contained in the liquid is separated and removed, wherein this connection member has an elastic seal part which liquid-tightly and slidably connects to a connection part with the housing of the membrane module or the liquid collecting header, and a supporting member which keeps the distance of the connection member and the liquid collecting header constant to control their mutual contact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solid-liquid separator, a solid-liquid separation device that separates and removes solids contained in the liquid to be treated by passing the liquid to be treated, such as purified water, sewage, and factory wastewater, through a hollow fiber having liquid permeability. The present invention relates to a membrane module unit for a liquid separator and a connecting member for a solid-liquid separator.

  In water treatment such as water purification treatment and sewage treatment, various methods for performing solid-liquid separation of a liquid to be treated using a membrane module provided with a separation membrane such as a microfiltration membrane and an ultrafiltration membrane have been studied. When the treatment liquid is filtered using the separation membrane, it is possible to obtain a filtrate in which the solid is highly separated and removed. As a solid-liquid separation device using a membrane module, a plurality of membrane modules having a pair of housings in which liquid-permeable hollow fibers are juxtaposed to form a membrane and both ends thereof are integrally fixed so as to be accommodated inside each Is placed in an immersion tank filled with the liquid to be treated. The housing of each membrane module is connected to the water collection header via a connection member. By connecting a suction device to the water collection header and sucking, the filtrate from which the solid contained in the liquid to be treated has been separated and removed from the surface of each hollow fiber is guided to the housing through the hollow fiber, via the connecting member. Are collected in the water collection header and taken out of the immersion tank. Solids separated and removed from the liquid to be treated adhere to the surface of the hollow fiber and clogging proceeds, resulting in a decrease in filtration flow rate and an increase in transmembrane pressure difference. In order to avoid and recover from such a state, an air diffuser is provided at the lower part of the membrane module, and during solid-liquid separation operation or filtration is stopped, bubbling is performed, and the solid adhering to the hollow fiber is removed from the hollow fiber. Peeling from the surface is performed. Specifically, using a membrane module in which a sheet-like hollow fiber membrane is resin-fixed in a rectangular housing, the distance between adjacent membrane modules is kept constant, bubbling is performed from the air diffuser, and the flow of the liquid to be processed Has been reported to supply a hollow fiber to a hollow fiber and perform stable solid-liquid separation (Patent Documents 1 to 3).

  In such a solid-liquid separator using a membrane module, when the membrane module and the membrane module unit are enlarged for the purpose of increasing the throughput, the diameter of the filtrate outlet is increased, and the amount of filtrate that flows through the collection header Increase in size according to

  On the other hand, since the membrane module is required to be compact as well as to improve the throughput, the thickness of the membrane module is made as thin as possible. Therefore, the diameter of the filtered water outlet is also reduced. In many cases, it is not possible to smoothly flow filtered water at one outlet, and in such a case, a plurality of filtrate outlets are provided in one membrane module.

  It is difficult to directly connect the enlarged membrane module and the water collection header due to variations in the size of each member. For this reason, a flexible flexible tube or a resin tube is used to connect the large membrane module and the water collection header. These flexible pipes can absorb the vibrations that are received during bubbling to remove solids attached to or attached to the hollow fiber from the surface by the air diffuser, and transfer the vibrations to the water collection header. Although it is suitable for shutting off and suppressing the damage, at the same time, it is necessary to have a rigidity that does not cause deformation with respect to suction used for filtration. Materials that satisfy such conditions are very limited and relatively expensive. Further, such a flexible pipe is liquid-tightly connected to the water collection header by tightening with a nut or the like using a packing. In a membrane module unit including a large number of membrane modules, there are many connection points, and therefore, packing tightness or tube insertion failure may occur during assembly. Also, during use, the nut that holds the packing may be loosened due to vibration, resulting in poor sealing. That is, when the flexible pipe as described above is used, it cannot be said that the assemblability is good, and there is room for improvement in that the water treatment is stably performed for a long period of time.

  The present inventors use a commonly used material, and are composed of a plurality of molded product members having a certain degree of rigidity, and are connected using an elastic seal, thereby being liquid-tight and sliding. A connecting member (Patent Document 4) having mobility and improved assemblability has already been developed.

However, in this connection member, when the vibration of the membrane module is continuously received over a long period of time in order to disperse the solid adhering to the hollow fiber, the end of the connection member contacts the membrane module or the water collection header. Can wear out and in some cases can be damaged.
Japanese Patent Laid-Open No. 5-261253 JP-A-6-342 JP-A-6-340 JP2005-20369

  It is an object of the present invention to be lightweight, compact, and capable of absorbing dimensional errors, but is less expensive, and can easily and securely connect a connection member to a housing of a membrane module and a liquid collection header in a fluid-tight manner. Even when the membrane module is subjected to vibration for a long time to disperse the solid adhering to the hollow fiber surface, the membrane module housing or the connection portion between the liquid collection header and the connection member Another object of the present invention is to provide a solid-liquid separation device, a membrane module unit, and a connecting member that can suppress wear and damage and can perform solid-liquid separation processing stably over a long period of time.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have made an elastic seal member that is liquid-tight and slidably connected at each connection portion between the connection member and the membrane module housing or liquid collection header. And a supporting member that keeps the connecting member and the membrane module housing or the liquid collection header at regular intervals to suppress mutual contact, thereby suppressing wear or damage at the end, and the membrane module is a dispersing means. As a result, the inventors have obtained the knowledge that a stable solid-liquid separation process can be performed over a long period of time even when subjected to vibration, and the present invention has been completed.

  That is, in the present invention, a soaking tank filled with a liquid to be treated containing a solid, and a plurality of hollow fibers arranged in the soaking tank and having liquid permeability are arranged in parallel, and both end portions thereof are accommodated in the inside, respectively. A plurality of membrane modules having a pair of integrally fixed housings, a collection header to which the housing of each membrane module is connected by a connecting member, and connected to the collection header to allow hollow fibers to pass through the liquid to be treated In a solid-liquid separator having a suction device that collects and removes the filtrate separated and removed in the collection header and a dispersion means that disperses the solid adhering to the hollow fiber surface and suppresses clogging. The membrane module-side elastic seal member that is fluid-tight and slidably connected to the connecting portion between the member and the membrane module housing, and the connection member and the membrane module housing are spaced at a constant interval A liquid collection header side elastic seal member that has a membrane module side support member that holds and suppresses mutual contact, and is connected in a liquid-tight and slidable manner to a connection portion between the connection member and the liquid collection header; and a connection member And a liquid-collecting header side support member that holds the liquid-collecting header at a constant interval and suppresses mutual contact.

  Further, the present invention is arranged in a dipping tank filled with a liquid to be treated containing solid, and is fixed integrally so that a large number of hollow fibers having liquid permeability are juxtaposed and both ends thereof are accommodated in the interior, respectively. A plurality of membrane modules having a pair of housings, the housings of each membrane module being connected by a connecting member, and collecting the filtrate obtained by separating and removing solids contained in the liquid to be treated by allowing the hollow fibers to pass through the suction device A membrane module unit for a solid-liquid separation device having a header, and a membrane module side elastic seal member that is liquid-tight and slidably connected to a connection portion between the connection member and the housing of the membrane module, and the connection member and the membrane module And a membrane module side support member that holds the housings at regular intervals and suppresses mutual contact, and the connection part between the connection member and the liquid collection header is liquid-tight. A liquid-collecting header-side elastic seal member that is slidably connected, and a liquid-collecting header-side support member that holds the connecting member and the liquid-collecting header at a constant interval and suppresses mutual contact. The present invention relates to a membrane module unit for a separator.

  The present invention also provides a membrane module having a pair of housings integrally fixed so that a large number of liquid-permeable hollow fibers are juxtaposed and both ends thereof are accommodated therein, and the hollow fibers are permeated by a suction device. In a connection member for a solid-liquid separation device that connects a liquid collection header that collects the filtrate that has separated and removed the solid contained in the liquid to be treated, it is liquid-tight and slidable at the connection with the membrane module housing The membrane module-side elastic seal member to be connected and the membrane module-side support member that holds the membrane module housing at a constant interval and suppresses mutual contact. And a liquid collection header side elastic seal member that is slidably connected, and a liquid collection header side support member that holds the liquid collection header at a constant interval and suppresses mutual contact. About solid-liquid separation device for connecting members to.

  The solid-liquid separation device, membrane module unit, and connecting member of the present invention are lightweight, compact and can absorb dimensional errors, but are less expensive and can slide between the connecting member and the membrane module housing and the liquid collection header. Even when the membrane module is subjected to vibration for a long period of time in order to disperse the solid adhering to the hollow fiber, the housing of the membrane module or the liquid collection It is possible to suppress wear and damage at the connection portion between the header and the connection member, and to perform the solid-liquid separation process stably over a long period of time.

  The solid-liquid separation device of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of an example of the solid-liquid separator of the present invention. In the solid-liquid separation device of the example of the present invention shown in FIG. 1, an immersion tank 101 filled with a liquid to be treated containing solids and a plurality of hollow fibers 12 arranged in the immersion tank and having liquid permeability are arranged in parallel. A plurality of membrane modules 102 having a pair of housings 13a and 13b that are integrally fixed so that both ends thereof are housed inside, respectively, and a liquid collection header 9 to which the housings of each membrane module are connected by a connecting member 100; A membrane module unit 102 comprising: a suction device 103 that is connected to the liquid collection header and collects and removes the filtrate that has passed through the hollow fiber and separated and removed the solid contained in the liquid to be treated in the liquid collection header; And a dispersing means 104 for dispersing solid adhering to the hollow fiber surface and suppressing clogging.

  The immersion tank may be any material, strength, and size as long as it is filled with the liquid to be processed and at least the membrane module can be disposed in the liquid to be processed. In addition, the immersion tank is provided with a discharge device or the like for discharging the solid separated from the liquid to be treated and precipitated.

  The membrane module unit provided in the solid-liquid separator is an example of the membrane module unit of the present invention, and includes a plurality of membrane modules and a liquid collection header to which the housing of each membrane module is connected by a connecting member. The The membrane module that constitutes the membrane module unit is made into a membrane by arranging a large number of liquid-permeable hollow fibers 12 in parallel, and is fixed in a liquid-tight manner integrally with a fixing member so that both ends of the hollow fibers are accommodated therein. It has a pair of housings 13a and 13b. It is preferable to use a flat membrane module because it has good cleaning properties and is not easily clogged, and can be stably filtered for a long time. An example of the membrane module is shown in FIG. The membrane module shown in FIG. 2 is provided with a liquid introduction tube 15 between a pair of housings 13a and 13b on both sides of a membrane-like hollow fiber, and maintains a distance between the pair of housings to support the hollow fiber in a membrane shape. At the same time, it functions as a flow path for the filtrate collected in the housing 13b to the housing 13a. The housings 13a and 13b are preferably rectangular so that the membrane modules can be highly integrated. The inside of the housing is hollow, and a filtrate outlet 16 that enables connection to the connecting member 100 is provided on the side surface of one housing 13a. The filtrate outlet may be provided on one side surface, but is preferably provided on both side surfaces.

  The hollow fiber 12 is preferably made of a material that is liquid permeable and has durability against the liquid to be treated. Specific examples of the material include cellulose, polyolefin, polysulfone, polyvinyl alcohol, polymethyl methacrylate, polyvinylidene fluoride, polytetrafluoroethylene, and the like. Polyolefins such as high-strength polyethylene and polypropylene are preferred from the standpoint of the ability to cope with shaking. Polyvinylidene fluoride, polytetrafluoroethylene, etc. are preferred for applications that require durability against oxidizing agents and the like.

  A plurality of such membrane modules can be arranged in parallel in a row so that the hollow fiber membrane surfaces formed by parallel hollow fibers are opposed to each other as shown in the drawing, a plurality of columns arranged in a staggered manner, Although the hollow fiber membrane surface can be arranged horizontally, it is preferable from the viewpoint of washing efficiency that the hollow fiber membrane surface is arranged in the vertical direction.

  The liquid collection header 9 constituting the membrane module unit can be an arbitrary number depending on the shape of the membrane module, the number of filtrate outlets 16 provided in the housing, and the like. It is preferable to provide the filtrate so that the filtrate flows as evenly as possible. For example, when one filtrate outlet 16 is provided on each side of the housing, it is preferable to provide two liquid collection headers per membrane module unit. In addition, when providing filtrate outlets on both end faces of the housings 13a and 13b, it is preferable to provide four liquid collection headers per membrane module.

  In addition, the liquid collection header has a connection port 9a for connecting the connection member in order to connect to the membrane module via the connection member. The connection port 9a can be provided by selecting its position and number in accordance with the arrangement of the membrane module. As shown in the figure, when the membrane modules are arranged in parallel in a single row or in a plurality of columns so that the membrane-like hollow fiber surfaces face each other, the connection ports are provided in one row on one side of the liquid collection header at the arrangement interval of the membrane modules. When the membrane modules are in a staggered arrangement, the connection ports can be provided in a zigzag state in one liquid collection header, or the two liquid collection headers can be shifted and arranged.

  The connecting member 100 constituting the membrane module unit is an example of the connecting member of the present invention. As shown in the schematic sectional view of FIG. 3, the filtrate outlet 16 and the liquid collection header provided in the housing 13a of the membrane module. 9 is formed between the connection ports 9a, and the filtrate introduced into the housing through the hollow fiber is accumulated in the liquid collection header, and further, a series of passages for taking it out of the apparatus is formed. Further, the connecting member 100 preferably has a function of absorbing the vibration received by the membrane module from the dispersing means for removing the solid adhered to the hollow fiber and suppressing the transmission of the vibration to the liquid collection header. For this reason, a flexible member may be used, but although it is formed of a commonly used resin and has an appropriate rigidity, a plurality of members can be liquid-tightly slid through an elastic seal member. It is preferable from the viewpoint of easy manufacturing that the vibration is absorbed at the bonded portion. Further, in order to absorb the vibration received by the membrane module, the membrane module side elastic seal member 21 that is liquid-tight and slidably connected to the filtrate outlet 16 of the membrane module housing 13a is provided. The header 9 has a liquid collection header side elastic seal member 22 that is liquid-tight and slidably connected to a connection portion of the header 9 with the connection port 9a.

  As an example of such a connecting member, as shown in FIG. 3, there can be mentioned one using a total of two resin molded products of an L-shaped molded product female 1 a and an L-shaped molded product male 1 b. The L-shaped molded product female 1a has a hollow L-shaped tubular shape, and has a connection portion 4 to the liquid collecting header 9 and a connection portion 6 to the L-shaped molded product male 1b. A groove is provided in the connecting portion 4 with the liquid collection header 9, and the elastic seal 2 is mounted in this groove. Further, a protrusion 3a for restricting the depth inserted into the liquid collection header 9 is provided. The L-shaped molded product male 1b has a hollow L-shaped tubular shape, and has a connection portion 5 to the filtrate outlet 16 provided in the housing 13a of the membrane module 11 and a connection portion 7 to the L-shaped molded product female 1a. The two connecting portions 5 and 7 are provided with grooves, and the elastic seal 2 is attached to each of the grooves. Furthermore, the protrusion 3b which regulates the depth inserted in the filtrate outlet 16 is provided. These protrusions 3a and 3b regulate the depth at which the connecting member is inserted, and prevent the occurrence of displacement during use or excessive insertion of the connecting member, resulting in poor sealing. A structure having a function, for example, a protrusion for restricting the depth at which the connecting member is inserted into the liquid collection header or the membrane module side, or a step by changing the diameter may be used. The L-shaped molded product female and the L-shaped molded product male are fitted and connected via an elastic seal, and one flow path through which the filtrate flows is formed by the hollow portion of the L-shaped molded product female and the L-shaped molded product male. It is formed.

  When the connecting member such as the L-shaped molded product female 1a and the L-shaped molded product male 1b is a hollow tube, its inner diameter is preferably 0.5 cm or more from the viewpoint of suppressing pressure loss, and is preferably 1 cm or more. More preferably, it is preferably 5 cm or less, more preferably 3 cm or less from the viewpoint of not reducing the integration efficiency of the membrane module.

Such a connection member includes a membrane module-side support member 31 that holds the connection member and the housing of the membrane module at a constant interval and suppresses mutual contact at a connection portion between the membrane module housing and the liquid collection header. The connection portion has a liquid collection header side support member 32 that holds the connection member and the liquid collection header at a constant interval and suppresses mutual contact. As shown in FIG. 4, the membrane module side support member 31 is provided at the tip of the L-shaped molded product male 1 b, that is, as long as l ₂ is as short as possible, the distance between the membrane module housing and the housing is surely constant. It is preferable that the contact between the distal end portion of the L-shaped molded product male 1b and the housing of the membrane module due to vibration can be suppressed, and the wear and breakage of the distal end portion 5a of the L-shaped molded product male 1b can be suppressed. In addition, it is preferable that the membrane module side support member 31 is provided as far as possible from the membrane module side elastic seal member 21, that is, l ₁ is as long as possible. Similarly, the liquid collection header side support member 32 is preferably provided at the tip portion of the L-shaped molded product knife 1a, and is preferably provided as far as possible from the liquid collection header side elastic seal member 22. Two or more membrane module side support members and liquid collection header side support members may be provided.

At least one of the membrane module side support member and the liquid collection header side support member is preferably an elastic seal member. Examples of such an elastic seal member include a V-ring and an O-ring. The O-ring retains the slidability between the membrane module housing or the liquid collection header and the connection member, and can be connected in a liquid-tight manner. It is preferable because it can be installed in Specific examples of the material of the O-ring include nitrile rubber, styrene rubber (SBR), silicon rubber, ethylene propylene rubber, chloroprene rubber, fluoro rubber, and the like. Can be used in combination.
The membrane module side support member and the liquid collection header side support member are preferably provided with two O-rings or two backup rings 30 on either side with the O-ring interposed therebetween. The backup ring 30 preferably has wear resistance and slipperiness, and its hardness is low, but it is preferably higher than the O-ring. Examples of those having such properties include polyfluorinated ethylene resins and polyacetal. When the backup ring is installed in the groove formed in the connecting member, the protruding distance from the groove is preferably slightly lower than that of the O-ring.

  As an example of the connection member, the connection part 5 of the L-shaped molded product male 1b is inserted into the filtrate outlet of the membrane module housing, and the connection part 4 of the L-shaped molded product female 1a is inserted into the connection port of the liquid collection header. However, as the connection portion of the connection member used in the present invention, a structure that can be fitted to the filtrate outlet of the housing of the membrane module and a structure that can be fitted to the connection port of the liquid collection header are appropriately employed. be able to. For example, the connection port of the liquid collection header may be inserted into the liquid collection header side connection portion of the connection member, and the filtrate outlet of the membrane module housing may be inserted into the connection portion of the connection member of the membrane module. In this case, the membrane module side elastic seal member and the membrane module side support member are provided in the housing of the membrane module, and the liquid collection header side elastic seal member and the liquid collection header side support member are provided in the liquid collection header. By such a membrane module side support member or a liquid collection header side support member, the inner wall portion of the connection member that contacts the filtrate outlet end of the membrane module housing, or the inner wall of the connection member that contacts the connection port front end of the liquid collection header Abrasion damage of the part can be suppressed.

  The connecting member is formed of a material whose hardness is lower than the material of the membrane module housing and the liquid collection header, but the material of the connection member is equal to or higher than the material of the membrane module housing and the liquid collection header. When it has, by providing the membrane module side support member and the liquid collection header side support member, it is possible to suppress the wear and damage of the housing of the membrane module and the liquid collection header in contact with the connection member.

  The L-shaped molded product female 1a and the L-shaped molded product male 1b constituting the connecting member are preferably resin molded products because they are relatively inexpensive and easy to mold. The resin molded product is obtained by molding a resin, and the molding method can be appropriately selected from known resin molding methods such as injection molding.

  The resin used for the resin molded product can be appropriately selected in consideration of the use environment and processability. Examples thereof include thermoplastic resins such as vinyl chloride resin, polyolefin resin, polystyrene resin, ABS resin, polycarbonate resin, polyamide resin, polyester resin, modified polyphenylene ether resin, and polyacetal resin. These resins can be used alone or in combination depending on the application.

  Regarding the mechanical strength of the resin used in the resin molded product, the bending specified in JIS K7171 (Plastic-Bending Characteristic Testing Method) is used from the viewpoint of suppressing the deformation of the molded product and maintaining the liquid tightness of the fitting portion. The elastic modulus is preferably 1 GPa or more. Further, from the viewpoint of ease of molding, the flexural modulus is preferably 10 GPa or less. Further, the resin may be reinforced. For example, when the strength higher than the intrinsic strength of the resin is required, the fitting portion needs to be liquid-tight, so a fiber reinforced resin in which the mixing amount of the filler is adjusted to the extent that the surface smoothness is not lowered is resin-molded. You may use for goods. In this case, from the same viewpoint as described above, it is preferable that the reinforcing resin has a flexural modulus of 1 GPa or more and 10 GPa or less.

  Furthermore, the material of the elastic seal 2, the membrane module side elastic seal member 21, and the liquid collection header side elastic seal member 22 is specifically the material of the O-ring of the membrane module side support member or the liquid collection header side support member. A backup ring similar to the above-described backup ring can be used together with these.

  Moreover, what is shown in FIG. 5 can be mentioned as another example of the connection member used for this invention. The connection member shown in the schematic cross-sectional view of FIG. 5 has a total of three hollow members of two L-shaped molded products and one I-shaped member. This connecting member extends between two L-shaped molded products shown in FIG. 3 by an I-shaped member, and these are connected by an elastic seal so as to be liquid-tight and slidable. One flow path through which the filtrate from the membrane module flows is formed by the two L-shaped molded articles and the hollow portion of one I-shaped member. In addition, in the figure, although the connection part with the housing | casing of a membrane module and the connection part with a liquid collection header are abbreviate | omitting illustration, like the connection part shown in FIG. 3, in the connection part with the housing of a membrane module, A membrane module-side elastic seal member that is liquid-tight and slidably connected; and a membrane module-side support member that holds the connection member and the housing of the membrane module at a constant interval and suppresses mutual contact. A liquid collection header side elastic seal member that is connected to the liquid collection header in a fluid-tight and slidable manner, and a liquid collection header side that maintains a constant distance between the connection member and the liquid collection header to suppress mutual contact And a support member.

  As the I-shaped member, any hollow member having a shape that can be fitted to the outer diameter of the L-shaped molded product at both ends can be used. For example, a tube, particularly a circular tube can be used. The inner diameter of the mold member does not necessarily have the same diameter and shape as a whole, and may have a large diameter portion and a small diameter portion. Moreover, the shape of an outer diameter may differ from the shape of an internal diameter regardless of a straight pipe and a curved pipe. The I-shaped member may be fitted into the L-shaped molded product. As the I-type member 17, for example, a resin molded product obtained by molding a resin similar to the molded products 1a and 1b, for example, a thermoplastic resin, can be used. Alternatively, the material of the I-type member may contain rubber such as nitrile rubber, styrene rubber (SBR), silicon rubber, ethylene propylene rubber, chloroprene rubber, fluorine rubber, or elastomer. The I-shaped member is not limited to the flexible pipe, and as described above, a resin molded product can be preferably used because it is relatively inexpensive and easy to mold. In addition, when the I-shaped member has a particularly simple shape, a metal processed product such as stainless steel or an aluminum alloy can be suitably used. As described above, the material of the I-type member can be appropriately selected according to the application.

  In the connecting member, the L-shaped molded product is a right-angled L-shaped product. For example, a stepped or curved curved pipe is used, and one end and the other end of the L-shaped molded product are approximately 90 degrees. It may be.

  The connecting member is provided with a cover 8 having a U-shaped cross-section to cover them, and when the membrane module is back-washed by flowing water or a chemical solution from the liquid collecting header 9 to the membrane module, the connecting member is made of the membrane module. You may make it suppress drop | omission from a housing or a liquid collection header. The cover 8 can be fixed to a frame 10 of a membrane module unit, a liquid collection header, etc., which will be described later. A metal, resin, fiber reinforced resin, or the like can be applied to the cover, but a cover obtained by bending a metal plate is preferable from the viewpoint of strength and ease of processing.

  As shown in FIG. 6, the membrane module unit fixes the membrane module 11 in the frame 10, connects a connection member to each membrane module and the liquid collection header, covers the connection member with the cover 8, and the frame 10. It can be produced by fixing to the substrate.

The suction device used in the present invention is connected to a liquid collection header, and filtrates obtained by separating and removing solids contained in the liquid to be treated by passing through the hollow fiber by suction are removed from the housing of the membrane module through a connecting member. It has the function of collecting and taking out the collected header. The suction speed can be appropriately selected depending on the liquid to be treated, the membrane module, and the like. For example, 1-1500 m < ³ > / day etc. can be mentioned.

  As the dispersing means used in the present invention, any means can be used as long as the solid adhering to the hollow fiber surface is dispersed and clogging is suppressed. Specifically, the liquid to be treated is circulated on the membrane-like hollow fiber surface, and the water pressure removes the solid adhering to the hollow fiber to form a water flow, or the gas is released and attached to the hollow fiber by bubbling. An air diffuser for removing solids can be used. These dispersing means can be provided not only from the lower part of the immersion tank but also from the side surface so that gas can be released.

  As the liquid to be treated that can be processed by the solid-liquid separation device of the present invention, any liquid can be used as long as the liquid contains solids such as purified water, sewage, and factory waste water. It is not limited to water, and any organic solvent may be used as long as it is liquid.

  Hereinafter, the present invention will be described specifically by way of examples.

  ABS resin (trade name: Psycholac SW3, manufactured by UMG ABS Co., Ltd.) was injection molded, and the structure shown in FIG. 3 had an inner diameter of 1.6 cm and an outer diameter of 2.4 cm (excluding the outer diameter of the connecting portion 6). An L-shaped hollow member (L-shaped molded female 1a and male 1b) having a circular cross section was manufactured. Attach a sealing material made of ethylene propylene rubber (EPDM) O-ring (JIS designation number: P20) to the groove of the connection part 7 of the L-shaped molded product, and insert the L-shaped molded product male into the L-shaped molded product female. A connected body was obtained. Ten sets of connected bodies were prepared.

Two membrane modules having filtrate outlets 16 (circular through-holes having a diameter of 2.4 cm) at two locations above the structure shown in FIG. 2 are connected to a liquid collection header 9 (with an inner diameter of 2.4 cm) by the connecting body. It was connected to a circular tubular connection port 9a) as shown. The membrane module has a width of 125 cm, a height of 200 cm, and a thickness of 3 cm. The housing portion has an ABS resin (trade name: 125 cm, a height of 7.5 cm, and a thickness of 3 cm). Psycholac SW3: manufactured by UMG ABS Co., Ltd.) was formed by injection molding. At this time, ethylene propylene rubber (EPDM) O-rings (JIS designation number: P20) are provided in grooves provided at l ₁ = 10 mm and l ₂ = 5 mm (FIG. 4) from the respective ends of the connecting portions 4 and 5 of the coupling body. ) And a backup ring (made by NOK: GN0413-A0) so that it is sandwiched, and connecting portions 4 and 5 of the connector are inserted into the connecting port 9a of the liquid collecting header and the filtrate outlet 16 of the membrane module, respectively. It is. At this time, the connecting portions 4 and 5 were inserted until the projection 3a abuts on the side wall of the connection port 9a and until the projection 3b abuts on the side wall of the housing 13a (surface on which the filtrate outlet is formed). . The cover 8 was formed by bending a stainless steel plate having a thickness of 1 mm, and was fixed to the frame and the liquid collection header at a position covering the connector. The cover was sized and shaped so that the connector attached to the liquid collection header and the membrane module would not come off at the respective connecting portions.

  The collection header is a square with a cross section of 5 cm on one side, welded to a stainless steel square pipe (SUS304) with a thickness of 2 mm at intervals of 45 mm, one end of the square pipe is closed, and the other end is The filtrate outlet was welded. Furthermore, a flat plate with a screw hole for attaching the cover was welded.

  As described above, the process of connecting the hollow member to form a coupling body, and the process of connecting the coupling body to the liquid collection header and the membrane module need only be performed by inserting each member into the other member, and alignment and nut tightening. Etc. are unnecessary and extremely easy. Moreover, since it is possible to prevent the connection of each member from being removed simply by attaching the cover, this is also easy in this respect.

  The membrane module connected to the liquid collection header by the connecting member was fixed to a frame having an inner dimension of 126 cm, a depth of 50 cm, and a height of 220 cm shown in FIG. 6 to produce a membrane module unit. An air diffuser having a width of 126 cm, a depth of 50 cm, and a height of 70 cm was disposed under the membrane module unit. Two diffuser tubes 19 having a diameter of 7 cm were arranged in the diffuser at an interval of 25 cm.

  When the membrane module unit and the diffuser are submerged in an activated sludge tank (immersion tank) with a depth of 3.5 m and 250 liters of air is discharged from the diffuser, an upward swirling flow of 100 cm per second is generated, resulting in a linear velocity. It was possible to filter well at 0.8 m / day for a long time. After 90 days of operation, no wear or damage was found in the connecting portion between the connecting member and the membrane module housing and in the connecting portion between the connecting member and the liquid collection header.

  The solid-liquid separation device and the membrane module unit of the present invention can be suitably used for separation operations such as water purification and sewage treatment because of their long life.

  The connecting member of the present invention can be suitably used for producing the membrane module unit as described above.

It is a typical perspective view which shows an example of the solid-liquid separator of this invention. It is a typical perspective view which shows an example of the solid-liquid separator of this invention, and the membrane module used for the membrane module unit of this invention. It is typical sectional drawing which shows an example of the connection member of this invention. It is typical sectional drawing which shows the principal part of an example of the connection member of this invention. It is typical sectional drawing which shows the other example of the connection member of this invention. It is a typical side view which shows an example of the membrane module unit of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a L type molded product female 1b L type molded product male 2 Elastic body seals 3a, 3b Protrusions 4 Liquid collection header connection part 5 Membrane module connection part 6 Connection part of L type molded product female with L type molded product male 7 L Connection part 8 of male molded product with female L-shaped product 8 Cover 9 Collection header 9a Collection header connection port 10 Frame 11 Membrane module 12 Hollow fiber 13a, 13b Housing 14 Resin fixing member 15 Liquid conduit 16 Filtrate Outlet 17 I-shaped member 19 Air diffuser tube 21 Membrane module side elastic seal member 22 Liquid collection header side elastic seal member 30 Backup ring 31 Membrane module side support member 32 Liquid collection header side support member 100 Connection member 101 Immersion tank 102 Membrane module unit 103 Suction device 104 Dispersing means

Claims (10)

A pair of immersion tanks filled with a liquid to be treated containing solids, and a pair of solid fibers arranged in the immersion tank and fixed integrally so that a large number of hollow fibers having liquid permeability are juxtaposed and both ends thereof are accommodated therein. A plurality of membrane modules each having a housing, and a collection header to which the housing of each membrane module is connected by a connecting member, and a solid contained in the liquid to be processed that is connected to the collection header and permeates the hollow fiber. In a solid-liquid separation device having a suction device that collects and removes the separated and separated filtrate in a collection header, and a dispersion means that disperses solid adhering to the surface of the hollow fiber and suppresses clogging,
The membrane module-side elastic seal member that is fluid-tight and slidably connected to the connecting portion between the connection member and the membrane module housing, and the connection member and the membrane module housing are held at a constant interval to suppress mutual contact. A membrane module side support member,
A liquid collection header side elastic seal member that is fluid-tight and slidably connected to the connection portion between the connection member and the liquid collection header, and a collection member that holds the connection member and the liquid collection header at a constant interval to suppress mutual contact. A solid-liquid separator having a liquid header side support member.   The solid-liquid separator according to claim 1, wherein at least one of the membrane module side support member or the liquid collection header side support member is an elastic seal member.   The solid-liquid separator according to claim 1 or 2, wherein the elastic seal member has an O-ring.   4. The solid-liquid separator according to claim 1, wherein the elastic seal member has an O-ring backup ring. A membrane having a pair of housings arranged in a dipping tank filled with a liquid to be treated containing a solid and integrally fixed so that a large number of hollow fibers having liquid permeability are juxtaposed and both ends thereof are accommodated in the interior, respectively. Solid-liquid separation comprising a plurality of modules, each membrane module housing being connected by a connecting member, and having a liquid collection header for collecting the filtrate obtained by separating and removing the solid contained in the liquid to be treated by passing through the hollow fiber with a suction device A membrane module unit for an apparatus,
The membrane module-side elastic seal member that is fluid-tight and slidably connected to the connecting portion between the connection member and the membrane module housing, and the connection member and the membrane module housing are held at a constant interval to suppress mutual contact. A membrane module side support member,
A liquid collection header side elastic seal member that is fluid-tight and slidably connected to the connection portion between the connection member and the liquid collection header, and a collection member that holds the connection member and the liquid collection header at a constant interval to suppress mutual contact. A membrane module unit for a solid-liquid separator, comprising a liquid header side support member.   The membrane module has a rectangular housing and a rectangular hollow fiber membrane surface formed by parallel hollow fibers, and the hollow fiber membrane surfaces are opposed to each other and arranged in parallel with each other. Item 6. The membrane module unit for a solid-liquid separator according to Item 5. A membrane module having a pair of housings integrally fixed so that a large number of liquid-permeable hollow fibers are juxtaposed and both ends thereof are accommodated inside, and the hollow fibers are permeated by a suction device and contained in the liquid to be treated In the connection member for the solid-liquid separation device for connecting the liquid collecting header for collecting the filtrate separated and removed,
Membrane module-side support that keeps the membrane module-side elastic seal member that is liquid-tight and slidably connected to the membrane-module housing connection part and the membrane module housing at a constant distance to suppress mutual contact And having a member
Liquid collection header side support that keeps the liquid collection header side elastic seal member connected to the liquid collection header in a fluid-tight and slidable manner and the liquid collection header at a constant interval and suppresses mutual contact. And a connecting member for a solid-liquid separator.   8. The connection member for a solid-liquid separator according to claim 7, wherein at least one of the membrane module side support member or the liquid collection header side support member is an elastic seal member.   The connection member for a solid-liquid separator according to claim 7 or 8, wherein the elastic seal member has an O-ring.   The connection member for a solid-liquid separator according to any one of claims 7 to 9, wherein the elastic seal member has an O-ring backup ring.

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