JP2010234224A - Apparatus and method for cleaning membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for cleaning a membrane module capable of sufficiently removing solid matters blocking the gaps between its membrane elements, of reducing the amount used of a cleaning liquid, and of reducing a load required in recovering and treating effluent resulting from the cleaning liquid. <P>SOLUTION: The cleaning apparatus 11 includes a pair of ejection means 14a, 14b that eject cleaning water 13 into a plurality of gaps between a plurality of membrane elements 84 of a membrane module 81 installed in an installation section 12, a belt conveyor 15 that carries out the solid/liquid separation of effluent resulting from the cleaning water 13 by virtue of its mesh belt 16 disposed below the installation section 12, a storage tank 18 that stores a filtrate 17 having passed through the mesh belt 16, and a circulation/supply means 19 that supplies the pair of ejection means 14a, 14b with the filtrate 17 in the storage tank 18, as cleaning water 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cleaning apparatus and a cleaning method for cleaning a submerged membrane module used for solid-liquid separation in, for example, sewage treatment or sludge concentration.

  Conventionally, as shown in FIGS. 8 to 11, this type of submerged membrane module 81 is provided in a treatment tank 80 and is immersed in a liquid 82 to be treated such as sewage waste water. Each membrane module 81 has a pair of left and right water collecting cases 83 and a plurality of flat membrane-like membrane elements 84 for solid-liquid separation disposed between the water collecting cases 83. Each of the water collection cases 83 is a rectangular box-shaped member, and includes a water collection space 85 inside.

  Each membrane element 84 has a square plate-like filter plate 86 and a filter membrane 87 made of a flat membrane attached to both the front and back surfaces of the filter plate 86. The membrane elements 84 are arranged in parallel so that the filtration membranes 87 of the adjacent membrane elements 84 face each other, and a gap 93 with a predetermined interval A is provided between the membrane surfaces of the filtration membranes 87. A plurality of permeate flow passages 88 communicating with the water collection space 85 are formed on both front and back surfaces of the filter plate 86.

In the state where the membrane module 81 is installed in the processing tank 80, the surface C (upper and lower surfaces) from which the open end of the gap 93 is exposed is kept in the horizontal direction.
A water collection pipe 90 is provided in the treatment tank 80, and the water collection space 85 of the membrane module 81 and the water collection pipe 90 communicate with each other through a connection pipe 91. In addition, a permeate extraction pipe (not shown) is connected to the water collection pipe 90, and a suction pump (not shown) is provided in the permeate extraction pipe. A diffuser 92 is provided below the membrane module 81.

  By starting the filtration operation by driving the suction pump, the inside of each membrane element 84 is depressurized, and solid matter such as sludge in the liquid to be treated 82 is captured by the filtration membrane 87 of the membrane element 84, and the filtration membrane 87. The permeated water that has permeated the flow into the permeate flow passage 88 of the membrane element 84 flows into the water collection space 85 of the membrane module 81 from the permeate flow passage 88 as treated water.

  The permeated water (that is, treated water) collected in the water collecting space 85 in this way flows into the water collecting pipe 90 through the connection pipe 91, flows from the water collecting pipe 90 to the permeated water extraction pipe, and goes to the outside of the processing tank 80. It is taken out.

A membrane module having a water collection case and a membrane element as described above is described in Patent Document 1 below.
During normal filtration operation, the membrane surface of the filtration membrane 87 is cleaned by aeration from the aeration device 92, but sudden changes in sludge properties, troubles in the aeration device 92, or excessive suction Solid matter (cake) such as sludge and contaminants in the liquid to be treated 82 gradually adheres to the surface of the filtration membrane 87 due to continuation of the filtration operation under pressure, and such solid matter is between the membrane elements 84. May clog up between the membrane elements 84.

  In this case, the membrane module 81 is taken out from the treatment tank 80, and as shown by the phantom line in FIG. 10, the operator sprays the cleaning water 79 from the hose 94 or the like between the membrane elements 84, and between the membrane elements 84. The clogged solid was removed.

  Further, in Patent Document 2 below, as shown in FIG. 12, a treatment tank 95 is provided with a cleaning device 97 for cleaning the membrane module 96. The cleaning device 97 has an injection nozzle 99 that is movable in the horizontal direction above the membrane module 96. The liquid 100 to be treated in the treatment tank 95 is sprayed from the spray nozzle 99 toward the membrane element 98, and at this time, the spray nozzle 99 is moved in the horizontal direction along the gap between the membrane elements 98 to thereby form the membrane element 98. The solid matter deposited on the surface of the substrate is washed.

JP-A-11-33370 JP 2002-52323 A

  However, as indicated by the phantom lines in FIG. 10, as described above, the cleaning method in which the operator sprays the cleaning water 79 from the hose 94 or the like between the membrane elements 84 to remove the solid matter clogged between the membrane elements 84. However, there is a problem that the cleaning efficiency is low and the amount of cleaning water used is increased. In addition, as the cleaning water increases, a large amount of cleaning wastewater containing the removed solid matter is generated, which increases the load required to recover and process the cleaning wastewater.

  Further, as shown in FIG. 12, when the membrane module 96 in which the gap between the membrane elements 98 is blocked using the cleaning device 97 shown in the above-mentioned Patent Document 2, the object containing solid matter such as the removed sludge is removed. Since the treatment liquid 100 is sprayed from the spray nozzle 99 to the membrane element 98 as a cleaning liquid, the pump 101 that supplies the cleaning liquid to the spray nozzle 99 and the spray nozzle 99 are damaged, and solids are sprayed on the membrane surface of the membrane element 98. Therefore, there is a problem that the filtration membrane may be damaged.

  When the cleaning liquid is sprayed from above the membrane module 96 with the solid matter clogged between the membrane elements 98, the liquid 100 to be treated (cleaning liquid) sprayed from the spray nozzle 99 accumulates between the membrane elements 98 and sprays. Since the kinetic energy of the treated liquid 100 (cleaning liquid) thus applied does not directly act on the solids deposited between the membrane elements 98, the cleaning efficiency of the membrane elements 98 is reduced, and the solids between the membrane elements 98 are sufficiently removed. There is a problem that can not be.

  The present invention can sufficiently remove solid matter blocking between membrane elements, can reduce the amount of cleaning liquid used, and can reduce the load required to recover and process the cleaning waste liquid. It is an object of the present invention to provide a membrane module cleaning apparatus and a cleaning method capable of performing the above.

In order to achieve the above object, the first invention is a membrane module in which a plurality of flat membrane elements having filtration membranes arranged on both sides are arranged in parallel with a predetermined gap between the membrane surfaces. A cleaning device for cleaning
An installation section for installing the membrane module to be cleaned;
An injection means for injecting a cleaning liquid between the membrane elements of the membrane module installed in the installation section;
Solid-liquid separation means for solid-liquid separation by a water permeable member provided below the installation portion of the cleaning waste liquid mixed with the cleaning liquid sprayed from the spraying means to the membrane module and the solid matter removed from the membrane module;
Filtrate storage means for storing the filtrate that has passed through the water-permeable member of the solid-liquid separation means;
A circulation supply means for supplying the filtrate in the filtrate storage means to the injection means as a cleaning liquid.

  According to this, a membrane module is taken out out of a tank and installed in the installation part of a washing | cleaning apparatus. Then, the cleaning liquid is sprayed between the membrane elements of the membrane module from the spraying means, thereby removing the solid matter clogged between the membrane elements and the solid matter adhering to the filtration membrane surface of the membrane element.

  At this time, the cleaning waste liquid, which is a mixture of the cleaning liquid sprayed from the spraying means to the membrane module and the solid matter removed from the membrane module, falls from the membrane module below the installation section and is separated into solid and liquid by the solid-liquid separation means. Is done. Among these, since the solid substance in the washing | cleaning drainage which does not pass the water-permeable member of a solid-liquid separation means remains on a water-permeable member, a solid substance can be collect | recovered easily.

  In addition, the liquid in the cleaning drainage liquid that has passed through the water permeable member is stored in the filtrate storage means as a filtrate, supplied to the injection means from the filtrate storage means by the circulation supply means, and from the injection means to the membrane module as the cleaning liquid. Injected between membrane elements.

  In this way, after the cleaning liquid sprayed from the spraying means to the membrane module is separated into solid and liquid, it is collected in the filtrate storage means, and again sprayed from the spraying means and reused for cleaning the membrane module. It is possible to reduce the amount. In addition, since the solid matter in the cleaning waste liquid can be easily recovered, the load required to recover and process the cleaning waste liquid can be reduced.

Furthermore, since the amount of solids in the cleaning liquid that is circulated and reused is reduced, it is possible to reduce damage to the circulation supply means or the filtration membrane that accompanies the ejection of the cleaning liquid.
In the membrane module cleaning apparatus according to the second aspect of the invention, the membrane module is installed in the installation section with the side where the end opening of the gap between the membrane elements is exposed as a side surface.
The spray means sprays the cleaning liquid toward the surface where the open end of the gap between the membrane elements is exposed.

  According to this, the cleaning liquid is ejected from the ejection means into the gap between the membrane elements, and the solid matter clogged between the membrane elements and the solid matter adhering to the filtration membrane surface of the membrane element are removed. At this time, the membrane module is installed with the side where the end opening portion of the gap between the membrane elements is exposed as the side surface, and the cleaning liquid is sprayed toward the surface (side surface) where the end opening portion is exposed. The sprayed cleaning liquid does not stay in the space between the membrane elements, and quickly and reliably flows down from between the membrane elements to the lower side of the membrane module together with the removed solid matter.

  As a result, since the sprayed cleaning liquid directly collides with the solid matter clogged between the membrane elements, the sprayed cleaning liquid is prevented from staying between the membrane elements and reducing the solid removal capability. be able to.

The membrane module cleaning device according to the third aspect of the present invention is a belt conveyor having an endless belt in which the solid-liquid separation means is rotatable,
The belt is made of a water permeable member.

  According to this, by ejecting the cleaning liquid between the membrane elements, the cleaning waste liquid falls from the membrane module below the installation portion and is separated into solid and liquid by the belt conveyor. Among these, the solid matter in the cleaning waste liquid that does not pass through the belt of the belt conveyor remains on the belt, but the solid matter can be easily recovered by rotating the belt constantly or every predetermined time. Further, the liquid in the washing drainage that has passed through the belt is stored as filtrate in the filtrate storage means.

In the membrane module cleaning apparatus according to the fourth aspect of the present invention, the spray means is disposed on one side of the membrane module installed in the installation section,
The installation part has a rotating means for rotating the installed membrane module.

  According to this, the membrane module is installed in the installation portion of the cleaning device, and the open end portion of the gap between the membrane elements exposed on one side surface of the membrane module is opposed to the spraying means. Then, the cleaning liquid is sprayed from the spraying means into the gap between the membrane elements of the facing membrane module. Thereafter, the membrane module is rotated halfway by the rotating means of the installation section, and the end opening portion of the gap between the membrane elements exposed on the other side of the membrane module is made to face the ejection means. And a washing | cleaning liquid is injected between the membrane elements of the membrane module which opposes from an injection means.

Thus, by rotating the membrane module installed in the installation section with the rotating means, the solid matter can be removed using the ejecting means disposed only on one side of the membrane module.
The fifth aspect of the present invention is a cleaning method for cleaning a membrane module in which a plurality of flat membrane elements each having a filtration membrane on both sides are arranged in parallel with a predetermined gap between the membrane surfaces. ,
The cleaning liquid is sprayed from the spray means toward the membrane element of the membrane module,
Washing waste liquid mixed with the washing liquid sprayed onto the membrane module and the solid matter removed from the membrane module is solid-liquid separated by a water-permeable member,
Discharging solid matter remaining on the permeable member;
The filtrate that has passed through the water permeable member is stored in the filtrate storage means,
The filtrate in the filtrate storage means is again ejected from the ejection means as a cleaning liquid.

  According to this, the cleaning liquid sprayed from the spraying means to the membrane module is separated into solid and liquid, then collected in the filtrate storage means, and sprayed again from the spraying means and reused for cleaning the membrane module. It is possible to reduce the amount. In addition, since the solid matter in the cleaning waste liquid can be easily recovered, the load required to recover and process the cleaning waste liquid can be reduced.

In the sixth aspect of the invention, after the cleaning method described in the fifth aspect of the invention is carried out, the membrane module is immersed in a liquid and diffused from below the membrane module.
According to this, due to the air lift effect due to the diffused air, the upward flow of the gas-liquid mixed phase flows between the membrane elements of the membrane module, and the solid matter that could not be removed by spraying the cleaning liquid is removed, so the membrane element is further washed Is done.

  As described above, according to the present invention, the solid matter between the membrane elements can be sufficiently removed, the amount of the cleaning liquid used can be reduced, and the load required for collecting and processing the cleaning waste liquid. Can be reduced.

It is a perspective view of the washing | cleaning apparatus in the 1st Embodiment of this invention. FIG. 2 is a front view of the cleaning device. FIG. 2 is a plan view of the cleaning device. FIG. 2 is a side view of the cleaning device. FIG. 3 is an enlarged plan view of a spray nozzle and a membrane element of the cleaning device. It is a front view of the washing | cleaning apparatus in the 2nd Embodiment of this invention. FIG. 2 is a plan view of the cleaning device. It is a front view of the membrane module provided in the processing tank. It is a partially notched top view of a membrane module. It is a longitudinal cross-sectional view of a membrane module. It is a side view of the membrane element of a membrane module. It is a figure of the washing | cleaning apparatus of the conventional membrane module.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1-5, 11 is a washing | cleaning apparatus which mounts and wash | cleans the membrane module 81. FIG. The configuration of the membrane module 81 is the same as that of the conventional one (see FIGS. 8 to 11) described above, and detailed description thereof is omitted here.

  The cleaning device 11 is installed in the installation unit 12 for installing the membrane module 81 to be cleaned at the cleaning position, a roller conveyor 20 (an example of a conveying unit) for taking the membrane module 81 into and out of the installation unit 12, and the installation unit 12. A pair of left and right injection means 14a and 14b for injecting cleaning water 13 (an example of a cleaning liquid) into the gap 93 between the membrane elements 84 of the membrane module 81, and the cleaning sprayed to the membrane module 81 from both of the injection means 14a and 14b A belt conveyor 15 (an example of solid-liquid separation means) that separates the washing wastewater (washing waste liquid) in which the water 13 and the solid material 55 removed from the membrane module 81 are mixed, and the mesh belt 16 of the belt conveyor 15 are provided. A storage tank 18 (an example of a filtrate storage means) that stores the filtrate 17 that has passed through, and both injection means 14a, 1 using the filtrate 17 in the storage tank 18 as the wash water 13. And a circulation and supply means 19 supplies the b.

  One of the right and left injection means 14a includes an injection member 21 and a moving means 22 that moves the injection member 21 in the front-rear, left-right, and vertical directions X, Y, and Z. 5, the front-rear direction X corresponds to the width direction of the gap 93 between the membrane elements 84, the left-right direction Y corresponds to the depth direction of the gap 93, and the vertical direction as shown in FIG. Z corresponds to the length direction of the gap 93.

  The moving means 22 includes a pair of front and rear fixing members 23 fixed to the upper end edge of the storage tank 18, a first traversing member 24 provided on the fixing member 23 and movable in the left-right direction Y, and a first traversing member. 24, a lifting member 25 that can be moved up and down in the up-and-down direction Z, a second traversing member 26 that is provided in the lifting member 25 and that can move in the left-right direction Y, and a front-rear member that is provided in the second traversing member 26 And a third traversing member 27 movable in the direction X.

  The first traversing member 24 has a pair of left and right lower frames 24a, a pair of left and right vertical frames 24b erected on the lower frames 24a, and a connecting frame 24c connected between the upper ends of both the vertical frames 24b. is doing.

  A guide groove 28 that is long in the left-right direction Y is formed in the fixing member 23. The lower frame 24a is provided with a plurality of left and right slide pins 29 (two left and right in FIG. 1) which are inserted into the guide groove 28 and supported by the fixing member 23 and slide while being guided in the left-right direction Y. . When the slide pins 29 slide in the left-right direction Y while being guided by the guide grooves 28, the first traversing member 24 moves in the left-right direction Y with respect to the fixing member 23.

The elevating member 25 has a pair of front and rear elevating arms 25a and a pair of front and rear elevating frames 25b provided at the base end of the elevating arm 25a.
A guide groove 30 that is long in the vertical direction Z is formed in the vertical frame 24b. The elevating frame 25b is provided with a plurality of upper and lower slide pins 31 (upper and lower in FIG. 1) that are inserted into the guide groove 30 and slide while being guided in the vertical direction Z. When the slide pins 31 slide in the vertical direction Z while being guided by the guide grooves 30, the elevating member 25 moves in the vertical direction Z with respect to the first traversing member 24.

  A guide groove 32 that is long in the left-right direction Y is formed in the elevating arm 25a. At both ends of the second traversing member 26, there are provided a plurality of left and right slide pins 33 (two on the left and right in FIG. 1) which are inserted into the guide groove 32 and slide while being guided in the left-right direction Y. When the slide pins 33 are guided in the guide grooves 32 and slide in the left-right direction Y, the second traversing member 26 moves in the left-right direction Y with respect to the lifting member 25.

A guide rail 34 that is long in the front-rear direction X is provided on the upper surface of the second traversing member 26. The third traversing member 27 is guided by the guide rail 34 and moves in the front-rear direction X.
The movement of the first to third traversing members 24, 26, 27 and the lifting / lowering of the lifting / lowering member 25 are performed by a driving device (not shown) including a motor or a cylinder provided in the cleaning device 11. .

  The injection member 21 includes an injection pipe 21 a provided on the third traversing member 27, and a plurality of injection nozzles 21 b provided horizontally on the injection pipe 21 a and corresponding to the gaps 93 between the plurality of membrane elements 84. ing.

The other injection means 14b has the same configuration as the one injection means 14a.
The installation part 12 is set between one injection means 14a and the other injection means 14b. The roller conveyor 20 conveys the membrane module 81 in the front-rear direction X with respect to the installation unit 12, and is provided at the upper end of the storage tank 18.

  The belt conveyor 15 is provided at an upper portion in the storage tank 18, and includes pulleys 37 and 38 provided at both ends in the left-right direction Y, a plurality of rollers 39 disposed between the pulleys 37 and 38, A rotatable endless mesh belt 16 wound between pulleys 37 and 38, and a driving device 40 including a motor or the like for rotationally driving one pulley 37 are provided. The mesh belt 16 is made of a water-permeable member having excellent water permeability such as a net, cloth, or porous body, and is located below the installation portion 12 and below the roller conveyor 20. The downstream end of the belt conveyor 15 protrudes outward from the storage tank 18.

  The storage tank 18 is formed in a square box shape with an open top, and has an overflow plate 43 inside. The inside of the storage tank 18 is partitioned into a first storage part 44 and a second storage part 45 by an overflow plate 43. The first storage unit 44 has a larger capacity than the second storage unit 45, and the installation unit 12 is located above the first storage unit 44. The storage tank 18 is provided with a drain removal portion 46 that extracts the drain accumulated in the first storage portion 44.

  The circulation supply means 19 includes a circulation supply pipe 47 that communicates with the second storage section 45 and the injection pipes 21a of both the injection means 14a and 14b, a pump 48, and electromagnetic valves 49 and 50. The circulation supply pipe 47 includes a supply pipe 60 that communicates with the second reservoir 45, one branch pipe 61 that branches from the supply pipe 60 and communicates with the injection pipe 21 a of one injection means 14 a, and the supply pipe 60. The other branch pipe 62 branches and communicates with the injection pipe 21a of the other injection means 14b. The pump 48 is provided in the supply pipe 60, one electromagnetic valve 49 is provided in one branch pipe 61, and the other electromagnetic valve 50 is provided in the other branch pipe 62.

Hereinafter, the operation of the above configuration will be described.
The cleaning device 11 is installed in the vicinity of the processing tank 80, and the clear cleaning water 13 (for example, water in which tap water is mixed with a hydrophilizing agent) is previously added to the first and second storage portions 44 and 45 in the storage tank 18. Store it. In addition, extension roller conveyors 51 and 52 (an example of an extension conveying means) are arranged before and after the roller conveyor 20 of the cleaning device 11.

  Then, one membrane module 81 is taken out from the processing tank 80 and placed on the upstream (one) extension roller conveyor 51 via the pallet 53. The operator pushes the membrane module 81 on one of the extension roller conveyors 51 and conveys it to the installation unit 12.

  At this time, the membrane module 81 is installed in the installation unit 12 with the surface C from which the open end of the gap 93 between the membrane elements 84 is exposed as a side surface. That is, in the membrane module 81, the length direction of the gap 93 (the direction connecting the two water collecting cases 83) is the vertical direction Z, and the width direction of the gap 93 (that is, the thickness direction of the membrane element 84) is the front-back direction X. The gap 93 is installed in the installation section 12 with the depth direction of the gap 93 being the left-right direction Y. As a result, as shown in FIG. 5, the injection nozzle 21 b of one of the injection means 14 a faces one end open portion of the gap 93 between the membrane elements 84, and the injection nozzle 21 b of the other injection means 14 b is in addition to the gap 93. Opposite the open end.

  By driving the pump 48 and opening both solenoid valves 49 and 50, the wash water 13 in the second reservoir 45 is supplied to the injection pipes 21a of both injection means 14a and 14b through the circulation supply pipe 47, It is injected into the gap 93 between the membrane elements 84 of the membrane module 81 from the injection nozzles 21b of both the injection means 14a, 14b. Thereby, the solid matter (sludge etc.) clogged between the membrane elements 84 and the solid matter attached to the membrane surface of the filtration membrane 87 are removed.

At this time, the mesh belt 16 is rotated by rotationally driving one pulley 37 by the driving device 40 of the belt conveyor 15.
The cleaning waste water mixed with the cleaning water 13 sprayed from the spray nozzles 21b to the membrane module 81 and the solid matter removed from the membrane module 81 passes between the rollers of the roller conveyor 20 from the membrane module 81 and passes through the rollers of the roller conveyor 20. The liquid falls downward and is separated into solid and liquid by the mesh belt 16 of the belt conveyor 15. Among these, the solid matter 55 in the washing waste water that does not pass through the mesh belt 16 remains on the mesh belt 16 and is transported to the outside of the storage tank 18 from below the installation portion 12 by the rotation of the mesh belt 16 and is collected. 56 is discharged. Thereby, the solid substance 55 can be collect | recovered easily.

  Further, the washing wastewater that has passed through the mesh belt 16 is stored as the filtrate 17 in the first storage section 44 in the storage tank 18. At this time, the fine solid material 55 remaining in the filtrate 17 settles and accumulates at the bottom of the first reservoir 44, and the filtrate 17 in the upper layer of the first reservoir 44 is cleaned. The upper layer filtrate 17 (supernatant liquid) thus cleaned overflows the overflow plate 43 from the first reservoir 44 and is stored in the second reservoir 45. The filtrate 17 is supplied to the injection pipes 21a of both injection means 14a and 14b through the circulation supply pipe 47, and is again injected into the membrane module 81 as cleaning water 13 from the injection nozzles 21b of both injection means 14a and 14b. .

  In this way, the washing water 13 sprayed from the spraying means 14a, 14b to the membrane module 81 is separated into solid and liquid by the belt conveyor 15, and then collected in the storage tank 18, and sprayed again from the spraying means 14a, 14b. Since the membrane module 81 is reused for cleaning, the amount of the cleaning water 13 used can be reduced. In addition, since the solid material 55 in the cleaning wastewater can be easily recovered using the belt conveyor 15, the load required for recovering and processing the cleaning wastewater can be reduced.

  Furthermore, since the amount of solids in the wash water 13 that is recycled and reused is reduced, damage to the pump 48 or the filtration membrane 87 of the circulation supply means 19 due to the injection of the wash water 13 can be reduced.

  Further, in the installation section 12, the membrane module 81 is installed in a direction in which the gap 93 becomes longer in the vertical direction Z with the surface C from which the open end of the gap 93 between the membrane elements 84 is exposed as a side surface. Since the cleaning water 13 is sprayed from the horizontal direction (lateral direction) with respect to the gap 93, the sprayed cleaning water 13 does not stay in the space between the membrane elements 84 and from between the membrane elements 84 together with the solid matter. The membrane module 81 is quickly and surely flowed down and discharged below.

  As a result, the jetted washing water 13 directly collides with the solid matter clogged between the membrane elements 84 and flows down between the membrane elements 84 together with the solid matter. It can be prevented that the solid removal capability is reduced due to the retention between the membrane elements 84.

  Further, by driving each driving device, the first traversing member 24 and the second traversing member 26 are moved in the left-right direction Y, the elevating member 25 is moved in the up-down direction Z, and the third traversing member is moved. The member 27 can be moved in the front-rear direction X, whereby the injection nozzles 21b of both the injection means 14a, 14b can be moved in the front-rear, left-right, vertical direction X, Y, Z, respectively.

  For example, depending on the size of the membrane module 81, as shown in FIG. 5, the cleaning water 13 can be reliably injected into the gap 93 between the membrane elements 84 by moving the injection nozzle 21 b in the front-rear direction X. . Further, by moving the injection nozzle 21b in the left-right direction Y, the horizontal interval B between the membrane element 84 and the injection nozzle 21b can be maintained at a predetermined interval. Further, as shown in FIG. 2, the cleaning water 13 can be jetted over the entire length in the vertical direction Z of the gap 93 between the membrane elements 84 by moving the jet nozzle 21 b in the vertical direction Z. By such a thing, the solid substance between the membrane elements 84 can fully be removed.

  In addition, since the filtrate 17 (supernatant liquid), which has been cleaned by removing solids significantly, is stored in the second storage section 45, the operation of the pump 48, the circulation supply pipe 47, the injection nozzle 21b, or the like is hindered. Can be prevented.

  When the cleaning of the membrane module 81 is completed, the pump 48 is stopped, the injection of the cleaning water 13 from the injection nozzle 21b is stopped, the driving device 40 of the belt conveyor 15 is stopped, and the rotation of the mesh belt 16 is stopped. To do.

  Then, the operator pushes the membrane module 81 that has been cleaned and transports it from the installation section 12 onto the other extension roller conveyor 52, and lowers the membrane module 81 from the other extension roller conveyor 52 to enter the treatment tank 80. Install.

  Thereafter, the operator sequentially cleans another uncleaned membrane module 81 with the cleaning device 11 in the same manner as described above. At this time, since the membrane modules 81 are transported by the roller conveyors 20, 51, 52 and put into and out of the installation unit 12, a plurality of membrane modules 81 can be cleaned one by one in sequence. In addition, when the amount of the filtrate 17 in the storage tank 18 becomes insufficient during washing, fresh water such as tap water is newly replenished.

  In addition, after the membrane module 81 is cleaned as described above, as shown in FIG. 8, the membrane module 81 is placed in the treatment tank 80 and immersed in the liquid 82 to be treated. 92 may be operated to diffuse air from below the membrane module 81. In this case, it is also possible to perform aeration by immersing in a liquid in another air diffusion treatment tank instead of the treatment tank 80, and the liquid to be immersed is not limited to the liquid 82 to be treated. It may be water or washing water.

  Due to the air lift effect caused by the air diffusion, an upward flow is generated in the processing tank 80, and the upward flow flows between the membrane elements 84 of each membrane module 81, thereby cleaning the membrane element 84.

  In the first embodiment, the diameter of each injection nozzle 21b is set to a predetermined distance A or less between the membrane elements 84. For example, the diameter of each injection nozzle 21b is set to a diameter of 1 mm to 10 mm. In addition, the amount of cleaning water 13 sprayed from one spray nozzle 21b per minute is set to 5 to 15 liters, for example.

  In the first embodiment, both the solenoid valves 49 and 50 are opened, the cleaning water 13 is sprayed from the spray nozzles 21b of both spraying means 14a and 14b to the membrane module 81, and the membrane module 81 is simultaneously viewed from both the left and right sides. Although cleaning is performed, one electromagnetic valve 49 is opened, the other electromagnetic valve 50 is closed, and the cleaning water 13 is sprayed to the membrane module 81 only from the spray nozzle 21b of one spraying means 14a. The valve 49 may be closed, the other electromagnetic valve 50 may be opened, and the cleaning water 13 may be sprayed to the membrane module 81 only from the spray nozzle 21b of the other spraying means 14b, and the membrane module 81 may be washed alternately on the left and right sides. .

  In addition, by alternately switching the opening and closing of the electromagnetic valves 49 and 50, the cleaning water 13 is supplied from one of the injection nozzles 21b of one injection means 14a and the injection nozzle 21b of the other injection means 14b at predetermined time intervals. You may inject alternately.

  In the first embodiment, the operator pushes and conveys the membrane module 81 placed on each of the roller conveyors 20, 51, 52, but the rollers of each of the roller conveyors 20, 51, 52 are driven. And may be forcibly rotated and conveyed.

  In the first embodiment, the extension roller conveyors 51 and 52 are arranged before and after the roller conveyor 20 of the cleaning device 11, but the extension roller conveyors 51 and 52 may not be used.

  In the first embodiment, the membrane module 81 is transported by the roller conveyors 20, 51, 52 via the pallet 53 during cleaning. However, the membrane module 81 is directly placed on the roller conveyors 20, 51, 52. May be conveyed.

Next, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 6 and 7, the cleaning device 11 has only one injection means 14 a disposed on one side of the membrane module 81 installed in the installation unit 12, and the other injection means. 14b is not provided. The circulation supply means 19 includes a circulation supply pipe 47 communicating with the second reservoir 45 and the injection pipe 21a of the one injection means 14a, a pump 48, and one electromagnetic valve 49.

  The storage tank 18 has a bottom plate 65, a pair of front and rear vertical plates 66 and 67, and a pair of left and right side plates 68 and 69, and a plurality of frames 70 are installed between the upper ends of both the vertical plates 66 and 67. Yes. The installation unit 12 is set at a position facing the injection nozzle 21b of one of the injection units 14a, and includes a turntable 72 (an example of a rotation unit) that rotates the installed membrane module 81. The turntable 72 is rotatable around the vertical axis 71 and is supported by the frame 70 and provided at the upper end of the storage tank 18.

Hereinafter, the operation of the above configuration will be described.
One membrane module 81 is placed on the turntable 72 of the installation unit 12, and one end opening portion of the gap 93 between the membrane elements 84 exposed on one side C1 of the membrane module 81 is used as an injection nozzle of one injection means 14a. It is made to oppose 21b.

  By driving the pump 48 and opening the electromagnetic valve 49, the filtrate 17 in the second reservoir 45 is supplied to the injection pipe 21 a of the injection means 14 a through the circulation supply pipe 47 and is used as the cleaning water 13 as an injection nozzle. 21b is injected into an open end of the gap 93 between the opposing membrane elements 84.

  After a predetermined time has elapsed, the pump 48 is stopped to stop the injection of the cleaning water 13, and the operator rotates the turntable 72 by 180 ° to rotate the membrane module 81 halfway, and is exposed on the other side C <b> 2 of the membrane module 81. The other end open portion of the gap 93 is opposed to the injection nozzle 21b of one injection means 14a. Then, by driving the pump 48, the cleaning water 13 is jetted between the membrane elements 84 of the membrane module 81 facing from the jet nozzle 21b.

  In this way, by rotating the membrane module 81 installed in the installation unit 12 with the turntable 72, the solid matter of the membrane module 81 is removed using the injection means 14a disposed only on one side of the membrane module 81. Can be removed.

In the second embodiment, the operator manually rotates on the turntable 72. However, the operator may automatically rotate with a rotary drive device such as a motor.
You may provide the roller conveyor 20 as shown in the said 1st Embodiment in the washing | cleaning apparatus 11 of the said 2nd Embodiment.

In the second embodiment, the cleaning device 11 having only one ejection unit 14a is shown. However, the cleaning device 11 having only the other ejection unit 14b may be used.
In each of the above embodiments, when the membrane module 81 is being washed, the belt conveyor 15 is continuously driven and the mesh belt 16 is constantly rotated. However, the mesh belt 16 is rotated every predetermined time to be solid. The object 55 may be discharged.

  In each of the above embodiments, the mesh belt 16 is given as an example of the water-permeable member, and the belt conveyor 15 is given as an example of the solid-liquid separation means. As an example of the solid-liquid separation unit, the net-like basket may be conveyed by a conveyor to discharge the solid material 55.

  In each of the above embodiments, the filtrate 17 in the storage tank 18 overflows the overflow plate 43 from the first storage part 44 and flows into the second storage part 45, whereby the purified filtrate 17 is used as the washing water 13. Although reused, a draining flexible container bag may be provided in the storage tank 18, and the filtrate 17 may be filtered and reused as the washing water 13.

  In each of the above embodiments, the cleaning water 13 is sprayed toward the upper and lower surfaces of the membrane module 81 during the filtration operation shown in FIG. 8 (see FIG. 2), but the side surface of the membrane module 81 during the filtration operation is If it is an open state or a structure that can be opened and closed, the cleaning water 13 may be sprayed toward the side surface where the open end of the gap 93 between the membrane elements 84 is exposed.

  In each of the above embodiments, the membrane module 81 is placed on the installation portion 12 so that the front-rear direction X is the width direction of the gap 93 between the membrane elements 84 and the vertical direction Z is the length direction of the gap 93. However, the membrane module 81 may be mounted so that the longitudinal direction X is the length direction of the gap 93 and the vertical direction Z is the width direction of the gap 93. In this case, what is necessary is just to comprise so that the several injection nozzle 21b may be arranged in the up-down direction Z, and may be moved to the front-back direction X.

  In each of the above embodiments, tap water is used as the washing water 13, but industrial water, sodium hypochlorite-containing water, surfactant-containing water, or the like may be used. Alkaline washing water may be used.

  In each of the above embodiments, the spray nozzle 21 b corresponding to the gap 93 between the membrane elements 84 is provided, but the cleaning water 13 sprayed from one spray nozzle 21 b enters the gap 93 between the plurality of membrane elements 84. In the case of spraying toward the surface, the spray nozzles 21 b may be provided at a pitch exceeding the arrangement pitch of the membrane elements 84.

  Even when the cleaning water 13 sprayed from one spray nozzle 21b is sprayed toward the gap 93 between the one membrane element 84, the spray nozzle 21b is moved in the front-rear direction X in each of the above embodiments. By moving it, it is possible to provide the ejection nozzles 21b at a pitch exceeding the arrangement pitch of the membrane elements 84.

11 Cleaning device 12 Installation section 13 Cleaning water (cleaning liquid)
14a, 14b Injection means 15 Belt conveyor (solid-liquid separation means)
16 Mesh belt (permeable member)
17 Filtrate 18 Storage tank (filtrate storage means)
19 Circulation supply means 72 Turntable (rotation means)
80 Treatment tank 81 Membrane module 82 Liquid to be treated 84 Membrane element 87 Filtration membrane 92 Aeration device 93 Gap A Predetermined gap C Surface where the open end of the gap between membrane elements is exposed

Claims (6)

A cleaning apparatus for cleaning a membrane module in which a plurality of flat membrane elements each having a filtration membrane on both sides are arranged in parallel with a predetermined gap between the filtration membrane surfaces,
An installation section for installing the membrane module to be cleaned;
An injection means for injecting a cleaning liquid between the membrane elements of the membrane module installed in the installation section;
Solid-liquid separation means for solid-liquid separation by a water permeable member provided below the installation portion of the cleaning waste liquid mixed with the cleaning liquid sprayed from the spraying means to the membrane module and the solid matter removed from the membrane module;
Filtrate storage means for storing the filtrate that has passed through the water-permeable member of the solid-liquid separation means;
A membrane module cleaning apparatus comprising: a circulation supply unit that supplies the filtrate in the filtrate storage unit to the spray unit as a cleaning liquid. The membrane module is installed in the installation part with the side where the end opening part of the gap between the membrane elements is exposed as a side surface,
2. The membrane module cleaning apparatus according to claim 1, wherein the spray means sprays the cleaning liquid toward a surface where an end opening portion of a gap between the membrane elements is exposed. The solid-liquid separation means is a belt conveyor having a rotatable endless belt,
3. The membrane module cleaning apparatus according to claim 1, wherein the belt is made of a water-permeable member. The injection means is disposed on one side of the membrane module installed in the installation unit,
The apparatus for cleaning a membrane module according to claim 2, wherein the installation part has a rotating means for rotating the installed membrane module. A cleaning method for cleaning a membrane module in which a plurality of flat membrane elements each having a filtration membrane on both sides are arranged in parallel with a predetermined gap between the filtration membrane surfaces,
The cleaning liquid is sprayed from the spray means toward the membrane element of the membrane module,
Washing waste liquid mixed with the washing liquid sprayed onto the membrane module and the solid matter removed from the membrane module is solid-liquid separated by a water-permeable member,
Discharging solid matter remaining on the permeable member;
The filtrate that has passed through the water permeable member is stored in the filtrate storage means,
A method for cleaning a membrane module, wherein the filtrate in the filtrate storage means is sprayed again from the spraying means as a cleaning liquid. A method for cleaning a membrane module, comprising: immersing the membrane module in a liquid after performing the cleaning method according to claim 5 and performing aeration from below the membrane module.

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