JP2018196867A - Filtration device and fiber part exchanging method - Google Patents

Abstract

To make it easy to exchange a fiber part.SOLUTION: A cylindrical part 2 of a filtration device 1 has a cylindrical shape which extends in a vertical direction, and has an upper opening 23 which is opened to the exterior. An isolation part 3 vertically divides an internal space 20 of the cylindrical part 2. Liquid can pass through the isolation part 3. A fiber part comprises a fiber filter medium which is accommodated in an upper space 201 which is a space on an upper side of the isolation part 3. The fiber part 4 captures a suspension substance in raw water which is compressed onto the isolation part 3 during filtration and flows in the internal space 20 from the upper opening 23. A delivery part 5 delivers treated water, which has passed through the fiber part 4 during filtration, from a lower space 202 which is a space on a lower side of the isolation part 3. An exchange part 81, which includes at least a part of the fiber part 4 and at least a part of the isolation part 3, is detachable from the filtration device 1. Thus, exchange of the fiber part 4 can be easily performed.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a filtering device that generates raw water by filtering raw water, and a fiber part replacement method that replaces a fiber part in the filtering device.

  Conventionally, in a filtration apparatus of a water treatment facility for treating fresh water, a technique for capturing suspended substances in fresh water with a long fiber bundle has been proposed (see Patent Documents 1 to 3). In the said filtration apparatus, a long fiber bundle is arrange | positioned in the internal space of the filtration tower installed on land, and the raw | natural water pumped with the pump is supplied from the upper direction of the sealed filtration tower. The long fiber bundle is bent and contracted by the flow of the raw water, and suspended substances in the raw water that permeate the long fiber bundle are captured by the voids of the long fiber bundle. In the filtration tower of Patent Document 3, a long fiber bundle is attached to a support for a long fiber bundle obtained by bending a metal rod, and the support is attached to each hole of a perforated plate installed in the tower body so as to be detachable. Yes.

Japanese Patent No. 4532297 Japanese Patent No. 5345512 JP-A-11-207107

  By the way, in the filtration apparatus as described above, when the long fiber bundles become dirty, the long fiber bundles are exchanged. In the case of Patent Document 3, since it is necessary to exchange a plurality of long fiber bundles one by one, it takes a long time to exchange, and it is difficult to easily exchange a plurality of long fiber bundles.

  This invention is made | formed in view of the said subject, and aims at making replacement | exchange of a fiber part easy.

  The invention according to claim 1 is a filtration device for producing treated water by filtering raw water, which has a cylindrical shape extending in the vertical direction and having an upper opening opened to the outside, and the cylinder A separating part through which the liquid can pass while dividing the internal space of the part vertically, and a fiber filter medium accommodated in an upper space that is a space above the separating part, and compressed on the separating part during filtration A fiber part that captures suspended matter in the raw water that has flowed into the internal space from the upper opening, and a delivery part that sends treated water that has passed through the fiber part during filtration from a lower space that is a space below the isolation part And an exchange part including at least a part of the fiber part and at least a part of the isolation part is detachable from the filtering device.

  Invention of Claim 2 is the filtration apparatus of Claim 1, Comprising: The said cylinder part is arrange | positioned in raw | natural water in the state which the said upper opening was located below rather than the external raw | natural water surface.

  Invention of Claim 3 is a filtration apparatus of Claim 1 or 2, Comprising: The said fiber part is a fiber filter medium extended in an up-down direction in the state which fixed the lower end part to the said isolation part in the said upper space. It is.

  The invention according to claim 4 is the filtration device according to any one of claims 1 to 3, wherein the cylindrical portion has the upper opening at an upper end and the isolation portion is attached to a lower end portion. And the lower cylinder part detachably attached to the lower end of the upper cylinder part, and the exchange part is the whole of the fiber part, the whole of the isolation part, and the whole of the upper cylinder part. including.

  According to a fifth aspect of the present invention, there is provided a cylindrical portion that extends in the vertical direction, an isolation portion that divides the internal space of the cylindrical portion in the vertical direction and allows liquid to pass therethrough, and a space above the isolation portion. A fiber filter medium accommodated in a certain upper space, wherein the fiber part is compressed on the isolation part during filtration and traps suspended substances in raw water flowing into the internal space from the upper opening; and the fiber part during filtration A fiber part exchange for exchanging the fiber part in a filtration device for producing treated water by filtering raw water from a lower part which is a space below the isolation part. A method, wherein the tubular part has an upper opening opened to the outside, and a) an exchange part including at least a part of the fiber part and at least a part of the isolation part is removed from the filtering device. B) corresponding to the exchange part A new replacement unit, and a step of attaching to the site of the exchange unit has been removed.

  Invention of Claim 6 is the fiber part replacement | exchange method of Claim 5, Comprising: The said cylinder part is arrange | positioned in raw | natural water in the state in which the said upper opening was located below the external raw | natural water surface. The a) step and the b) step are performed below the raw water surface.

  Invention of Claim 7 is the fiber part replacement | exchange method of Claim 5 or 6, Comprising: The said fiber part is extended in an up-down direction in the state which fixed the lower end part to the said isolation part in the said upper space. It is a fiber filter medium.

  Invention of Claim 8 is the fiber part replacement | exchange method of Claim 7, Comprising: In the said new replacement part, it is suppressed that a fiber filter medium is put together and spreads.

  The invention according to claim 9 is the fiber part exchanging method according to any one of claims 5 to 8, wherein the suspended matter is more than the raw water in parallel with the steps a) and b). Water with a low content is supplied to the lower space.

  A tenth aspect of the present invention is the fiber part replacement method according to any one of the fifth to ninth aspects, wherein the medicine is supplied to the lower space before the step b).

  In the present invention, the fiber part can be easily replaced.

It is a figure which shows the structure of the filtration apparatus which concerns on 1st Embodiment. It is a longitudinal cross-sectional view which shows a part of filtration apparatus. It is a longitudinal cross-sectional view which shows a part of filtration apparatus. It is a perspective view which shows an isolation part. It is a top view which shows a part of filtration apparatus. It is a bottom view which shows the lower space of a cylinder part. It is a figure which shows the flow of a filtration process. It is a figure which shows the flow of replacement | exchange of a fiber part. It is a figure which shows the mode in the middle of replacement | exchange of a fiber part. It is a figure which shows the mode in the middle of replacement | exchange of a fiber part. It is a longitudinal cross-sectional view which shows a part of filtration apparatus which concerns on 2nd Embodiment. It is a figure which shows the flow of replacement | exchange of a fiber part. It is a figure which shows the mode in the middle of replacement | exchange of a fiber part. It is a longitudinal cross-sectional view which shows a part of other filtration apparatus. It is a longitudinal cross-sectional view which shows a part of other filtration apparatus. It is a longitudinal cross-sectional view which shows a part of other filtration apparatus. It is a figure which shows the structure of another filtration apparatus.

  FIG. 1 is a diagram showing a configuration of a filtration device 1 according to the first embodiment of the present invention. The filtration device 1 is a device that generates treated water (that is, filtered water) by removing suspended substances in the raw water by filtering the raw water. The raw water filtered by the filtering device 1 may be seawater or fresh water (for example, river water, lake water, tap water, or sewage treated water). In the example shown in FIG. 1, the cylinder part 2 mentioned later of the filtration apparatus 1 is installed in the sea, and the raw | natural water filtered by the filtration apparatus 1 is seawater.

  2 and 3 are longitudinal sectional views showing a part of the filtration device 1. FIG. 2 shows a state in which raw water is filtered in the filtering device 1 during filtration. FIG. 3 shows a non-filtering state where the raw water is not filtered in the filtering device 1. In FIG. 3, some long fiber bundle elements 41 (described later) on the back side of the cross section are also drawn.

  The filtration device 1 includes a tube portion 2, a separation portion 3, a fiber portion 4, a delivery portion 5, and a treated water storage portion 6. The whole cylinder part 2 is arrange | positioned in the sea (namely, raw water). The isolation part 3 and the fiber part 4 are arranged in the internal space 20 of the cylinder part 2. The treated water storage part 6 is arrange | positioned on the land of the sea area where the cylinder part 2 is arrange | positioned, for example. The treated water reservoir 6 is preferably arranged at a position higher than the cylinder 2 (that is, the upper side in the direction of gravity). The delivery part 5 connects the cylinder part 2 and the treated water storage part 6.

  The cylinder part 2 is a substantially cylindrical member that extends in the vertical direction. In the example shown in FIG. 1, the cylinder part 2 is a substantially cylindrical member centering on the central axis J1 which faces an up-down direction. The up-down direction substantially coincides with the gravity direction. The shape of the cross section perpendicular to the vertical direction of the cylindrical portion 2 may be, for example, a substantially perfect circle, a substantially elliptical shape, or a substantially oval shape.

  As shown in FIGS. 2 and 3, the cylindrical portion 2 includes a side wall portion 21 and a bottom portion 22. The side wall part 21 is a substantially cylindrical part extended in the up-down direction. The bottom portion 22 is a substantially disc-shaped portion that closes the lower end of the side wall portion 21. The upper end of the side wall portion 21 is not closed, and an upper opening 23 that is a region surrounded by the upper end edge of the side wall portion 21 is formed. In other words, the cylinder part 2 is a bottomed cylinder shape, and has the upper opening 23 open | released directly to the exterior (namely, the sea around the cylinder part 2).

  In the example shown in FIG. 1, the diameter of the cross section perpendicular | vertical to the up-down direction of the cylinder part 2 is substantially constant over the full length of an up-down direction. In other words, the area of the cross section of the cylindrical portion 2 is substantially constant over the entire length in the vertical direction. The diameter of the cylinder part 2 is about 2-3 m, for example. The height of the cylinder part 2 is about 1.6 m, for example. In addition, the area of the said cross section of the cylinder part 2 does not necessarily need to be constant, For example, you may gradually reduce or increase gradually as it goes to the lower side from the upper end of the side wall part 21. FIG. In other words, the side wall portion 21 of the cylindrical portion 2 may be inclined to some extent with respect to the vertical direction.

  The cylinder part 2 is installed in a state where the bottom surface of the bottom part 22 is in contact with the seabed, for example. The upper opening 23 of the cylinder part 2 is located below the outside sea level (that is, the raw water surface). The internal space 20 of the cylindrical portion 2 is filled up to the upper opening 23 with raw water flowing from the upper opening 23. Specifically, due to a water head difference between the sea surface and the upper opening 23, raw water around the tube portion 2 flows into the internal space 20 of the tube portion 2 through the upper opening 23. The cylinder part 2 does not necessarily need to be mounted on the seabed, and may be installed with the lower part of the side wall part 21 and the bottom part 22 embedded in the seabed. Or the cylinder part 2 may be installed in the sea in the state which is suspended from the quay and the bottom part 22 is located above the seabed.

  The isolation part 3 is a member that extends substantially vertically in the vertical direction at the lower part of the internal space 20 of the cylindrical part 2 (that is, below the central part in the vertical direction of the cylindrical part 2). The isolation part 3 is supported by the cylinder part 2 and divides the internal space 20 of the cylinder part 2 vertically. The isolation part 3 extends over substantially the entire cross section perpendicular to the vertical direction of the cylinder part 2. The isolation part 3 is a member through which liquid can pass.

  FIG. 4 is a perspective view showing an example of the isolation part 3. In the example illustrated in FIG. 4, the isolation unit 3 includes a fixing unit 31 and a support unit 32. In FIG. 4, the fixing portion 31 and the support portion 32 are drawn apart from each other in the vertical direction. Each of the fixed portion 31 and the support portion 32 is a substantially disk-shaped member through which liquid can pass, and spreads over substantially the entire cross section perpendicular to the vertical direction of the cylindrical portion 2. The lower end of the fiber part 4 (see FIG. 3) is fixed to the fixing part 31. As shown in FIG. 3, the fiber part 4 is located above the fixed part 31. The support part 32 is fixed to the inner surface of the cylinder part 2. The fixing portion 31 is disposed on the upper surface of the support portion 32 and is detachably attached to the support portion 32.

  In the example illustrated in FIG. 4, the fixing unit 31 includes a net unit 311 and a frame unit 312. The frame portion 312 is a substantially annular portion surrounding the net portion 311. The net part 311 is, for example, a net-like part in which metal or resin linear members are arranged in a grid pattern. The outer peripheral portion of the net portion 311 is fixed to the frame portion 312. The support part 32 is a plate-like member having a plurality of through holes penetrating in the vertical direction. As the support portion 32, for example, a lattice-like member such as a grating or a wedge wire screen, or a plate-like member in which a large number of through holes are arranged substantially uniformly is used. In the example shown in FIG. 4, grating is used as the support portion 32. Each of the plurality of openings of the support portion 32 (that is, the openings of the plurality of through holes) is larger than each opening of the fixing portion 31. The opening of the fixing portion 31 is preferably larger than 10 mm square, more preferably larger than 20 mm square. The magnitude relationship between the opening of the support portion 32 and the opening of the fixing portion 31 may be changed as appropriate.

  The attachment of the fixing portion 31 to the support portion 32 may be performed, for example, by holding the frame portion 312 of the fixing portion 31 by a connection mechanism provided on the outer peripheral portion of the support portion 32. Alternatively, the fixing part 31 and the support part 32 may be connected by a binding band or the like.

  The fiber part 4 is a fiber filter medium accommodated in a space above the isolation part 3 (hereinafter referred to as “upper space 201”) in the internal space 20 of the cylinder part 2. Specifically, the fiber part 4 is a long fiber bundle. As described above, the lower end portion of the fiber portion 4 is fixed to the fixing portion 31 of the isolation portion 3. In other words, the lower end part of the fiber part 4 is indirectly fixed to the cylinder part 2 via the isolation part 3 (that is, the fixing part 31 and the support part 32). When the raw water is not filtered in the filtering device 1, the fiber portion 4 extends in the vertical direction in the upper space 201 of the cylindrical portion 2 with the lower end portion fixed to the separating portion 3. The fiber part 4 at the time of non-filtration is an uncompressed stretched state (that is, a non-compressed state).

  The vertical distance between the separating part 3 and the upper end of the stretched fiber part 4 is preferably 80% or more and 120% or less of the vertical distance between the separating part 3 and the upper opening 23. More preferably, it is 90% or more and 110% or less. In the example shown in FIG. 3, the upper end of the stretched fiber portion 4 is located at substantially the same position in the vertical direction as the upper opening 23 of the tube portion 2. In the example shown in FIG. 3, the upper end of the stretched fiber part 4 does not need to be located at the exact same position as the upper opening 23 in the vertical direction, and may be located at substantially the same position.

  At the time of filtering raw water in the filtering device 1, the fiber part 4 is bent by the raw water flowing downward in the internal space 20 of the cylinder part 2 and compressed (ie, consolidated) on the isolation part 3. And the suspended substance in raw | natural water which flowed into the internal space 20 from the upper opening 23 of the cylinder part 2 is capture | acquired by the fiber part 4 of a compression state, and a suspended substance is removed from raw | natural water. In the following description, water from which suspended substances have been removed by passing through the fiber portion 4 during filtration is referred to as “treated water”. The suspended substance is an insoluble substance having a particle diameter of 2 mm or less suspended in water, and is also called a suspended substance. Suspended substances are various inorganic substances or organic substances, and include suspended sand and marine organisms, for example.

  The fiber part 4 includes a long fiber bundle element 41 which is a plurality of fiber filter element. The stretched long fiber bundle element 41 is a member in which a plurality of long fibers extending in the vertical direction are bundled in a columnar shape. The length of the elongated fiber bundle element 41 in the stretched state is, for example, 50 cm to 200 cm, and is appropriately determined by adjusting the length to the height of the tube portion 2.

FIG. 5 is a plan view showing a part of the filtration device 1 during non-filtration. In FIG. 5, the long fiber bundle elements 41 are drawn larger than the actual length, and the number of long fiber bundle elements 41 is drawn smaller than the actual length. The shape of the long fiber bundle element 41 in plan view is, for example, a substantially circular shape. The diameter of the long fiber bundle element 41 in plan view is, for example, 30 to 100 mm. The shape of the long fiber bundle element 41 in plan view may be, for example, a substantially perfect circle, a substantially elliptical shape, or a substantially oval shape. The dry weight (hereinafter simply referred to as “weight”) of the long fiber bundle element 41 is, for example, 50 to 1000 g. The weight of the long fiber bundle element 41 per unit area in plan view is, for example, 30 to 90 kg / m ² . The length, weight, shape, and the like of the long fiber bundle element 41 may be changed as appropriate.

  In the example shown in FIG. 5, the plurality of long fiber bundle elements 41 are arranged concentrically around the central axis J <b> 1 of the cylindrical portion 2. The plurality of long fiber bundle elements 41 arranged on each circumference of the concentric circles are arranged at substantially equal angular intervals. In other words, the plurality of long fiber bundle elements 41 are arranged substantially point-symmetrically in plan view with the central axis J1 as the center. In addition, the shortest distance between the long fiber bundle element 41 arranged on one circumference and the long fiber bundle element 41 arranged on the adjacent circumference is the long fiber bundle element on any circumference 41 is preferably about the same. Furthermore, it is preferable that the plurality of long fiber bundle elements 41 arranged on the outermost periphery come into contact with the side wall portion 21 of the cylindrical portion 2. The number of long fiber bundle elements 41 may be more or less than that shown in FIG.

  The long fiber bundle element 41 is formed by bundling a large number of long fibers (that is, yarns) and fixing them together at the lower end. The long fibers constituting the long fiber bundle element 41 are, for example, polyester multifilaments. The fiber diameter and the number of filaments of the long fibers are 2200 dtex (decitex) and 432, for example. The long fiber is crimped, for example. The number of crimps of the long fibers is, for example, 4 to 7 pieces / 25 mm. In addition, the fiber diameter, the number of filaments, the number of crimps, and the material of the long fibers constituting the long fiber bundle element 41 may be appropriately changed. The long fiber may be a monofilament.

  In the example shown in FIG. 3, the lower end portions of the plurality of long fiber bundle elements 41 are each indirectly fixed to the isolation portion 3 via the connection member 42. The connecting member 42 is a string-like member that is flexible and easily deformable. For example, the connection member 42 is fixed to any one of a plurality of knot points in the net-like fixing portion 31. Since the fixing portion 31 has a relatively large number of knot points, the degree of freedom of arrangement of the plurality of long fiber bundle elements 41 can be improved. In the fiber part 4 in the stretched state, the long fiber bundle element 41 extends in the vertical direction, and the connection member 42 also extends in the vertical direction. Accordingly, the lower end portion of the long fiber bundle element 41 is separated upward from the isolation portion 3. In the fiber part 4, the connecting member 42 may be omitted, and the lower end part of the long fiber bundle element 41 may be directly fixed to the isolation part 3.

  In the filtration device 1, treated water that has passed through the fiber part 4 during the filtration of raw water (that is, seawater from which suspended substances have been removed by the fiber part 4) passes through the isolation part 3, and is a space below the isolation part 3. Into the lower space 202. The sending unit 5 sends the treated water in the lower space 202 to the treated water storage unit 6. The treated water storage unit 6 stores the treated water sent from the lower space 202 by the sending unit 5.

  The sending unit 5 includes a sending port 50 and a pipe 51. The delivery port 50 is provided in the lower space 202 of the cylinder part 2, and guides the treated water in the lower space 202 to the outside. The delivery port 50 is, for example, a pipe having a plurality of openings on the side surface. The pipe 51 is connected to the delivery port 50 and connects the lower space 202 of the cylinder part 2 and the treated water storage part 6. At the time of filtering raw water in the filtration device 1, treated water is sucked from the lower space 202 of the cylindrical portion 2 by a pump (not shown) and supplied to the treated water storage portion 6 through the pipe 51. Moreover, the flow of seawater from the upper side to the lower side is formed in the internal space 20 of the cylindrical portion 2 by suction by the pump.

  FIG. 6 is a bottom view showing the lower space 202 of the cylindrical portion 2. In FIG. 6, a plurality of elongated fiber bundle elements 41 in the stretched state are drawn together by a two-dot chain line. In the lower space 202 of the cylindrical portion 2, an air supply portion 7 used for cleaning the fiber portion 4 is disposed. The air supply unit 7 includes an air diffuser 71 that extends over substantially the entire cross section of the lower space 202 (that is, a cross section perpendicular to the vertical direction). The air diffuser 71 includes a main pipe extending in the radial direction and a plurality of branch pipes extending laterally from the main pipe. The air diffuser 71 is provided with a plurality of air supply ports 72. The air diffuser 71 is connected to a gas supply source (not shown) disposed on land, and sends the gas supplied from the gas supply source to the lower space 202 from the plurality of air supply ports 72. The gas sent from the diffuser 71 to the lower space 202 is supplied from the lower side of the isolation part 3 to the upper space 201 and used for cleaning the fiber part 4. The gas is, for example, air. A gas other than air may be supplied from the air diffuser 71. Details of the cleaning of the fiber part 4 will be described later.

  The plurality of air supply ports 72 are disposed, for example, at the lower end portion of the air diffusion pipe 71 (that is, the end portion on the opposite side to the isolation portion 3). In addition, the plurality of air supply ports 72 are positioned, for example, vertically below the plurality of long fiber bundle elements 41 in the fiber part 4 in the stretched state. The distance in the vertical direction between the lower end of the long fiber bundle element 41 and the air inlet 72 positioned vertically below the long fiber bundle element 41 is preferably 100 to 500 mm, more preferably 200 to 300 mm. is there.

  Next, the raw water filtration process by the filtration device 1 will be described with reference to FIG. In a state before the filtration device 1 is driven, the internal space 20 of the cylindrical portion 2 is filled with seawater, and there is no flow of seawater in the internal space 20. Further, as shown in FIG. 3, the plurality of long fiber bundle elements 41 of the fiber portion 4 extend in the up-down direction in an expanded state.

  When the filtration of the seawater is started in the filtration device 1, the seawater in the lower space 202 of the cylindrical portion 2 is sucked through the delivery port 50 and the pipe 51. At this time, the seawater in the lower space 202 is not treated water filtered by the fiber part 4 but contains suspended solids, and is therefore discarded in the sea without being stored in the treated water storage part 6. In the following description, the above process for discarding seawater at the start of filtration is referred to as “waste water treatment”.

  In the internal space 20 of the cylindrical portion 2, a downward seawater flow is formed, and the fiber portion 4 is compressed onto the isolation portion 3 by the flow as shown in FIG. 2. When the fiber part 4 is compressed, the flow rate of seawater sucked by the above-mentioned pump (hereinafter referred to as “water intake flow rate”) is, for example, a linear velocity (LV) of 1000 to 2000 m / day, In an embodiment, it is about LV 1500 m / day. And the suspended matter in raw | natural water is removed by the fiber part 4 of a compression state, and treated water is produced | generated. The treated water passes through the isolation part 3 and flows into the lower space 202 of the cylinder part 2.

  In the filtration device 1, the above-mentioned waste water treatment is performed until the compression of the fiber part 4 is completed and for a predetermined time after the compression of the fiber part 4 is completed (step S11). The initial loss head of the fiber part 4 at the completion of compression is preferably about 0.6 m or more when the intake flow rate is LV 1000 m / day. Further, the time required for step S11 is, for example, about 30 seconds to about 1 minute.

  When the compression of the fiber part 4 and the waste water treatment are finished, the treated water generated by filtering the raw water by the compressed fiber part 4 is supplied from the lower space 202 of the cylinder part 2 through the delivery port 50 and the pipe 51. It is supplied to the treated water reservoir 6 and stored (step S12). The water intake flow rate during the water intake treatment in step S12 is, for example, LV500 to 2000 m / day, and in the present embodiment, it is about LV1000 m / day. In the filtration device 1, for example, the water intake process is stopped after a predetermined time has elapsed since the start of the water intake process. Or the loss head of the fiber part 4 is measured with a pressure gauge etc., for example, when the said loss head becomes 2 m or more, a water intake process is stopped.

  When the water intake treatment is stopped, the above-described pump is driven, so that the treated water stored in the treated water reservoir 6 enters the lower space 202 of the cylinder portion 2 via the pipe 51 and the delivery port 50. Supplied. The supply flow rate of the treated water to the lower space 202 is, for example, LV 500 to 2000 m / day, and in the present embodiment, it is about LV 1000 m / day.

  The treated water supplied to the lower space 202 flows into the upper space 201 through the isolation part 3 in the internal space 20 of the cylinder part 2. As a result, an upward flow of treated water is formed in the internal space 20 of the cylindrical portion 2. As a result, the compressed long fiber bundle elements 41 are extended upward by the fluid force received by the fiber portion 4, and are in an expanded state as shown in FIG. Seawater that has reached the upper opening 23 of the cylindrical portion 2 flows out from the internal space 20 to the outside through the upper opening 23.

  Subsequently, air is supplied from the gas supply source described above to the lower space 202 via the air diffuser 71 while the supply of treated water to the lower space 202 is continued. The supply flow rate of air to the lower space 202 is, for example, LV 2 to 20 m / min, and in the present embodiment, it is about LV 9 m / min. The supply of gas from the gas supply unit to the diffuser pipe 71 is performed, for example, in a pulse form (that is, intermittently). The supply of gas from the gas supply unit to the diffuser pipe 71 may be performed continuously, for example.

  Air bubbles sent out from the plurality of air supply ports 72 (see FIG. 6) of the air diffuser 71 pass through the isolation part 3 and are supplied to the upper space 201. In the upper space 201, the fiber part 4 is washed by the upwardly treated water and air bubbles (that is, gas-liquid mixed phase flow). Specifically, the plurality of long fiber bundle elements 41 are swung by the gas-liquid mixed phase flow, and the suspended substances adhering to each long fiber bundle element 41 are washed away. The suspended matter removed from the long fiber bundle element 41 is conveyed upward by the gas-liquid mixed phase flow, and is discharged from the upper space 201 of the cylindrical portion 2 to the outside through the upper opening 23 and diffuses.

  When a predetermined time has elapsed from the start of air supply to the lower space 202, the supply of air is stopped while the supply of treated water is continued. In the upper space 201, air bubbles adhering to the long fiber bundle element 41 are removed from the long fiber bundle element 41 by the treated water flowing upward, and are discharged to the outside of the cylindrical portion 2. Thereafter, the supply of treated water to the lower space 202 is stopped, whereby the cleaning process for the fiber part 4 is completed (step S13).

  In the above-described cleaning process, supply of treated water to the lower space 202 is started, and supply of air to the lower space 202 is started approximately 30 seconds after the start of supply of treated water. Then, after the supply of treated water and air is continued for, for example, about 8 minutes or more, the supply of air is stopped, and finally the supply of treated water is stopped. In the filtration device 1, the cleaning method and the processing time may be appropriately changed. For example, the supply of air to the lower space 202 may be started simultaneously with the start of the supply of treated water. Further, the supply of treated water may be stopped simultaneously with the stop of the supply of air to the lower space 202. Further, a gas other than air may be supplied from the air diffuser 71 to the lower space 202.

  In the filtration device 1, the above-described steps S11 to S13 are repeated, whereby the treated water is obtained while preventing the fiber part 4 from being clogged. The obtained treated water is used in, for example, a seawater desalination plant, a power plant, a fishing port, an aquarium or a fish processing facility. Note that, depending on the degree of contamination of the fiber part 4, the cleaning process in step S13 may be performed a plurality of times between the water intake process in step S12 and the waste water process in the next step S11. Note that the liquid supplied to the lower space 202 in the cleaning process of the fiber part 4 may be cleaning water other than the above-described process water.

  In the filtration device 1, for example, when a predetermined period has elapsed from the start of use of the fiber part 4, the fiber part 4 is replaced. FIG. 8 is a diagram showing a flow of replacement of the fiber part 4. 9 and 10 are views showing a state in which the fiber part 4 is being replaced. 9 and 10 show a longitudinal section of the filtration device 1 and the like.

  When the fiber part 4 is exchanged, first, the treated water in the treated water reservoir 6 (see FIG. 1) passes through the pipe 51 and the delivery port 50 in the same manner as the cleaning process in step S13 described above. Through the separator 3 and flows to the upper space 201. Thereby, the flow of the upward process water is formed in the internal space 20 of the cylinder part 2 (step S21). In the filtering device 1, the treated water is continuously supplied to the lower space 202 until the replacement of the fiber part 4 is completed (steps S <b> 21 to S <b> 25), and the above-described upward treated water flow in the cylinder part 2 is maintained. The The supply flow rate of the treated water to the lower space 202 at the time of replacement of the fiber part 4 is, for example, smaller than the supply flow rate of the treated water at the time of the cleaning process in step S13. The supply flow rate at the time of replacement of the fiber part 4 is, for example, LV 500 m / day or less. The same applies to the flow rate of treated water supplied to the lower space 202 in steps S31 to S34 described later.

  Subsequently, as shown in FIG. 9, the fixing portion 31 that is a part of the isolation portion 3 is removed from the support portion 32 that is another part of the isolation portion 3. The fixing part 31 is taken out from the upper space 201 of the cylindrical part 2 through the upper opening 23 together with the fiber part 4 (that is, the plurality of long fiber bundle elements 41) fixed to the fixing part 31 (step S22). In the following description, the fiber part 4 and the fixing part 31 are collectively referred to as “exchange part 81”. The exchange part 81 can be attached to and detached from parts other than the exchange part 81 of the filtration device 1. In step S22, the exchange part 81 is removed from the other site | part (namely, site | part around the exchange part 81 in the filtration apparatus 1). In the example shown in FIG. 9, the exchange part 81 includes the entire fiber part 4 and the entire fixing part 31. In the example shown in FIG. 9, the fiber part 4 spreads laterally when the replacement part 81 is removed.

  When the exchange part 81 is removed from the filtration device 1, the medicine is supplied to the lower space 202 of the cylinder part 2 (step S23). The drug is supplied for the purpose of preventing or suppressing the adhesion of marine organisms to the inner surface of the tube portion 2 and the propagation of marine organisms in the tube portion 2. For example, hypochlorous acid or citric acid is used as the drug. In step S <b> 23, for example, solid hypochlorous acid (that is, hypochlorous acid tablet) is introduced into the lower space 202 of the cylindrical portion 2 through the upper opening 23. Alternatively, a hypochlorous acid solution may be supplied to the lower space 202 via the delivery port 50 or the like.

  Next, as shown in FIG. 10, a new replacement portion 82 corresponding to the removed replacement portion 81 is inserted into the upper space 201 from the upper opening 23 of the cylindrical portion 2. The new exchange part 82 has substantially the same structure as the exchange part 81 described above, and includes a new fixing part 31 and a new fiber part 4. In the example illustrated in FIG. 10, the new replacement unit 82 includes a suppression unit 83. The suppression part 83 collects the fiber part 4 (namely, fiber filter medium) of the new exchange part 82, and suppresses that the fiber part 4 spreads to the side.

  In the example shown in FIG. 10, the suppressing portion 83 is a flexible resin film member that is disposed so as to surround the fiber portion 4. The suppressing unit 83 wraps the plurality of long fiber bundle elements 41 together from the side. The new exchange part 82 is attached to the site | part from which the above-mentioned exchange part 81 was removed in the filtration apparatus 1 (step S24). Specifically, the fixed part 31 of the new replacement part 82 is attached to the support part 32 fixed to the cylinder part 2. Then, the suppression part 83 is removed and removed from the filtration apparatus 1 (step S25). Moreover, the supply of the treated water to the lower space 202 is stopped, and the replacement of the fiber part 4 is completed.

  In the above-described example, the exchange part 81 includes the entire fiber part 4 and the entire fixing part 31 (that is, a part of the isolation part 3), but is not limited thereto. In the filtration device 1, the exchange part 81 only needs to include at least a part of the fiber part 4 and at least a part of the isolation part 3. For example, even if the fixing portion 31 is divided into a plurality of substantially fan-shaped fixing portion elements in the circumferential direction, each fixing portion element can be attached to and detached from the support portion 32 independently of the other fixing portion elements. Good. In this case, the filtration device 1 includes a plurality of exchange parts 81, and each exchange part 81 includes each fixing part element that is a part of the separating part 3 and a plurality of long fiber bundle elements that are fixed to the fixing part element. 41 (that is, a part of the fiber part 4). The shape and number of the plurality of fixed part elements in the fixed part 31 (that is, the division method of the fixed part 31) may be variously changed.

  Moreover, in the filtration apparatus 1, the support part 32 is attached to the cylinder part 2 so that attachment or detachment is possible, and when the fiber part 4 is replaced, the fiber part 4, the fixing part 31, and the support part 32 are integrally formed. You may remove from the cylinder part 2. FIG. In this case, the exchange part 81 includes the whole fiber part 4 and the whole isolation part 3. The isolation part 3 does not necessarily have to include the fixing part 31 and the support part 32. For example, a grid-like member such as a grating or a wedge wire screen may be used as the isolation part 3 that can be attached to and detached from the cylinder part 2. Good. Also in this case, the exchange part 81 includes the whole fiber part 4 and the whole isolation part 3.

  As described above, the filtration device 1 includes the cylinder portion 2, the separation portion 3, the fiber portion 4, and the delivery portion 5. The cylinder part 2 is a cylinder shape extended in an up-down direction, and has the upper opening 23 open | released outside. The isolation part 3 divides the internal space 20 of the cylinder part 2 vertically. The separator 3 can pass liquid. The fiber part 4 is a fiber filter medium accommodated in the upper space 201 which is the space above the isolation part 3. The fiber part 4 is compressed on the isolation part 3 at the time of filtration and captures suspended substances in the raw water flowing into the internal space 20 from the upper opening 23. The sending unit 5 sends the treated water that has passed through the fiber unit 4 during filtration from a lower space 202 that is a space below the separating unit 3. The exchange part 81 including at least a part of the fiber part 4 and at least a part of the isolation part 3 is detachable from the filtration device 1. Thereby, the fiber part 4 which deform | transforms easily and spreads, or a part of fiber part 4 can be handled integrally, and replacement | exchange of the fiber part 4 in the filtration apparatus 1 can be made easy. As a result, the time required for replacement of the fiber part 4 can be shortened. The structure of the filtration device 1 that can shorten the time required for replacement of the fiber part 4 is particularly suitable for a filtration device in which the replacement part is removed and attached in water.

  As described above, the cylindrical portion 2 of the filtration device 1 is disposed in the raw water with the upper opening 23 positioned below the external raw water surface. As a result, the raw water naturally flows into the internal space 20 of the cylindrical portion 2 due to a water head difference between the raw water surface and the upper opening 23. Therefore, the supply of raw water to the cylinder part 2 can be simplified.

  When the fiber part 4 is replaced, the replacement part 81 is removed (step S22) and a new replacement part 82 is attached (step S24) below the raw water surface. Thereby, the fiber part 4 can be replaced | exchanged easily, without pulling up the cylinder part 2 of the filtration apparatus 1 from raw | natural water. Moreover, since the replacement | exchange part 81 can be removed and the new replacement | exchange part 82 can be attached through the upper opening 23 of the cylinder part 2, the filtration apparatus 1 is newly opened at the time of replacement | exchange of the fiber part 4. FIG. There is no need. Therefore, the replacement of the fiber part 4 can be further facilitated.

  In the filtration device 1, the fiber part 4 is a fiber filter medium extending in the vertical direction in a state where the lower end part is fixed to the isolation part 3 in the upper space 201. Thereby, the fiber part 4 which spreads easily to the periphery and is comparatively difficult to handle can be easily handled via the isolation part 3 (at least a part thereof). As a result, the replacement of the fiber part 4 can be further facilitated.

  As described above, the new exchanging unit 82 includes the suppressing unit 83 that suppresses the fiber portions 4 (that is, fiber filter media) of the new exchanging unit 82 from being collected and spread. Thereby, handling of the new exchange part 82 can be made easy, and attachment of the new exchange part 82 with respect to the filtration apparatus 1 can be made easy. Specifically, for example, when the new replacement part 82 is inserted into the cylinder part 2, the fiber part 4 can be prevented or suppressed from being caught by the upper end edge of the cylinder part 2. As a result, the replacement work of the fiber part 4 in the filtration device 1a can be simplified, and the time required for the replacement work can be shortened. Therefore, the structure of the filtration device 1 is largely limited to tools and heavy machinery that can be used for the replacement work of the fiber part 4, and has a strong demand for shortening the replacement time. Particularly suitable for filtration devices).

  In the replacement of the fiber part 4 described above, the treated water is supplied to the lower space 202 in parallel with the removal of the replacement part 81 (step S22) and the attachment of a new replacement part 82 (step S24). As a result, an upward flow of treated water is formed in the internal space 20 of the cylindrical portion 2. Therefore, when the fiber part 4 is replaced, it is possible to prevent or suppress the raw water (that is, water including marine organisms) from flowing into the lower space 202 from the outside. As a result, in the lower space 202, it is possible to prevent or suppress the attachment of marine organisms and the like to the inner surface of the cylindrical portion 2 and the propagation of marine organisms.

  When the fiber part 4 is replaced, water other than the treated water may be supplied to the lower space 202 in parallel with Step S22 and Step S24. The water supplied to the lower space 202 has a lower suspended solid content than raw water. Also in this case, the upward flow of the water is formed in the internal space 20 of the cylindrical portion 2, thereby preventing or suppressing the raw water from flowing into the lower space 202 from the outside. As a result, in the lower space 202, it is possible to prevent or suppress the attachment of marine organisms and the like to the inner surface of the cylindrical portion 2 and the propagation of marine organisms.

  In the replacement of the fiber part 4 described above, the medicine is supplied to the lower space 202 before the attachment of the new replacement part 82 (step S24) (step S23). Thereby, in the lower space 202, adhesion of marine organisms and the like to the inner surface of the cylindrical portion 2 and breeding of marine organisms can be prevented or suppressed.

  Next, the filtration apparatus 1a which concerns on the 2nd Embodiment of this invention is demonstrated. FIG. 11 is a longitudinal sectional view showing a part of the filtering device 1a, and corresponds to FIG. 3 described above. The filtration device 1a includes a cylindrical portion 2a having a structure different from that of the cylindrical portion 2, instead of the cylindrical portion 2 shown in FIG. The other structure of the filtering device 1a is substantially the same as the filtering device 1 shown in FIGS. In the following description, the same symbol is given to the configuration of the filtration device 1a corresponding to each configuration of the filtration device 1. In addition, the flow of the filtration process of raw | natural water by the filter apparatus 1a is the same as that of what is shown in FIG.

  As shown in FIG. 11, the tube portion 2 a of the filtration device 1 a includes an upper tube portion 25 and a lower tube portion 26. The lower cylinder part 26 is a part below the isolation part 3 in the cylinder part 2a. The lower cylinder part 26 is a bottomed substantially cylindrical part including the lower part of the side wall part 21 and the bottom part 22 of the cylinder part 2a. The upper cylinder part 25 is a part above the lower cylinder part 26 in the cylinder part 2a. The upper cylinder part 25 is a substantially cylindrical part including the upper part of the side wall part 21 of the cylinder part 2a. The upper cylinder part 25 has the above-mentioned upper opening 23 at the upper end. The isolation part 3 is attached to the lower end part of the upper cylinder part 25. The isolation | separation part 3 is being fixed to the inner surface of the lower end part of the upper cylinder part 25, for example. The lower cylinder part 26 is detachably attached to the lower end of the upper cylinder part 25. In the example shown in FIG. 11, a flange portion 251 that protrudes radially outward is provided at the lower end of the upper cylindrical portion 25, and a flange portion 261 that protrudes radially outward is provided at the upper end of the lower cylindrical portion 26. Provided. For example, the flange portion 251 of the upper tube portion 25 and the flange portion 261 of the lower tube portion 26 are vertically stacked with an O-ring or the like interposed therebetween, and are detachably fixed by bolts or the like. The upper cylinder part 25 and the lower cylinder part 26 may be fixed by various methods.

  FIG. 12 is a diagram showing a flow of replacement of the fiber part 4 in the filtration device 1a. FIG. 13 is a diagram illustrating a state in which the fiber portion 4 is being replaced. FIG. 13 shows a longitudinal section of the filtration device 1a and the like. When the fiber part 4 is exchanged, first, the treated water in the treated water storage part 6 (see FIG. 1) is treated in the lower space 202, which is the internal space of the lower cylinder part 26, as in step S21 described above. Continuously supplied. The treated water passes from the lower space 202 through the isolation part 3 and flows into the upper space 201 that is the internal space of the upper cylinder part 25. Thereby, an upward flow of treated water is formed in the internal space 20 of the cylindrical portion 2a (step S31). In the filtration device 1a, the treated water is continuously supplied to the lower space 202 until the replacement of the fiber part 4 is completed, and the upward treated water flow in the cylindrical part 2a is maintained. In the filtration device 1a, as described above, instead of the treated water, water having a lower suspended solid content than the raw water may be supplied to the lower space 202.

  Then, as shown in FIG. 13, the upper cylinder part 25 to which the fiber part 4 (that is, the plurality of long fiber bundle elements 41) and the isolation part 3 are fixed is removed from the lower cylinder part 26 (step S32). . In the filtration device 1a, the entire fiber part 4, the entire isolation part 3, and the entire upper cylinder part 25 are included in the exchange part 81a. The exchange part 81a can be attached to and detached from the filtration device 1a. In step S32, the exchange part 81a is removed from the other site | part (namely, site | part around the exchange part 81a in the filtration apparatus 1a).

  When the exchange part 81a is removed from the filtration device 1a, the above-mentioned medicine (for example, hypochlorous acid or citric acid) is supplied to the lower space 202 of the cylindrical part 2a (step S33). In step S <b> 33, for example, solid hypochlorous acid (for example, a tablet of hypochlorous acid) is introduced into the lower space 202 through the opening at the upper end of the lower cylinder part 26. Alternatively, a hypochlorous acid solution may be supplied to the lower space 202 via the delivery port 50 or the like.

  Next, a new replacement part corresponding to the removed replacement part 81a is attached to the upper end of the lower cylinder part 26 (step S34). The new replacement part has the same structure as the removed replacement part 81a. Specifically, the new replacement part includes the whole of the new fiber part 4, the whole of the new isolation part 3, and the whole of the new upper tube part 25. If the upper cylinder part 25 of a new exchange part is attached to the lower cylinder part 26, supply of the treated water to the lower space 202 will be stopped, and replacement | exchange of the fiber part 4 will be complete | finished. Even in the filtration device 1a, the fiber part 4 can be easily replaced in the same manner as the filtration device 1.

  As described above, the cylindrical portion 2a of the filtration device 1a includes the upper cylindrical portion 25 and the lower cylindrical portion 26. The upper cylinder portion 25 has an upper opening 23 at the upper end. The isolation part 3 is attached to the lower end part of the upper cylinder part 25. The lower cylinder part 26 is detachably attached to the lower end of the upper cylinder part 25. The exchange part 81a of the filtration device 1a includes the entire fiber part 4, the entire isolation part 3, and the entire upper cylinder part 25. Thereby, raw water can be filtered in a state in which the inner surface of the upper tube portion 25 is relatively clean. Therefore, the filtering device 1a is particularly suitable for filtering raw water in an environment where marine organisms or the like are likely to adhere to the inner surface of the upper cylindrical portion 25. Moreover, in the filtration apparatus 1a, by exchanging the fiber part 4, the isolation part 3, and the upper cylinder part 25 collectively, the exchange work can be simplified and the time required for the exchange work can be shortened. Therefore, the structure of the filtration device 1a is largely limited to tools and heavy machinery that can be used for the replacement work of the fiber part 4, and the filtration device installed in water (that is, placed in the raw water is strongly demanded to shorten the replacement time. Particularly suitable for filtration devices).

  In the new replacement part of the filtration device 1a, the upper cylinder part 25 is a suppressing part that collects the fiber parts 4 (that is, fiber filter media) and suppresses the fiber parts 4 from spreading sideways. For this reason, handling of a new exchange part can be made easy, and attachment of the new exchange part with respect to the filtration apparatus 1a can be made easy. As a result, the replacement work of the fiber part 4 in the filtration device 1a can be simplified, and the time required for the replacement work can be shortened.

  In the replacement of the fiber part 4 described above, in parallel with the removal of the replacement part 81a (step S32) and the attachment of a new replacement part (step S34), water having a lower suspended solid content than the raw water is lower. It is supplied to the space 202. Thereby, at the time of replacement | exchange of the fiber part 4, it can prevent or suppress that raw | natural water (namely, water containing a marine organism etc.) flows in into the lower space 202 from the outside. As a result, in the lower space 202, it is possible to prevent or suppress adhesion of marine organisms to the inner surface of the cylindrical portion 2a and propagation of marine organisms. The supply of the water to the lower space 202 is particularly suitable for the filtration device 1a in which the upper end edge of the lower cylindrical portion 26 is exposed to the raw water when the exchange portion 81a is removed.

  In the replacement of the fiber part 4 described above, the medicine is supplied to the lower space 202 before the attachment of a new replacement part (step S34) (step S33). Thereby, in the lower space 202, adhesion of marine organisms to the inner surface of the cylindrical portion 2a and propagation of marine organisms can be prevented or suppressed. The supply of the medicine to the lower space 202 is particularly suitable for the filtration device 1a in which the upper end edge of the lower cylinder part 26 is exposed in the raw water when the exchange part 81a is removed.

  In the filtration device 1a, the medicine may be supplied to the lower space 202 by a method other than the above. For example, the upper and lower ends of the new replacement part (that is, the upper opening 23 and the lower surface of the isolation part 3) are covered with a liquid-impermeable resin film or the like, thereby closing the internal space of the new replacement part. The internal space is filled with the drug solution. And just before attaching a new exchange part to the lower cylinder part 26, the resin film of the lower end of the said new exchange part is removed. Thereby, the medicine is supplied from the internal space of the new replacement part (that is, the upper space 201 of the upper cylinder part 25) to the lower space 202 of the lower cylinder part 26.

  Also in this case, as described above, in the lower space 202, it is possible to prevent or suppress adhesion of marine organisms to the inner surface of the cylindrical portion 2a and propagation of marine organisms. Moreover, in a new exchange part, adhesion of marine organisms to the inner surface of the upper cylinder part 25 and the fiber part 4 and propagation of marine organisms can also be prevented or suppressed. In addition, it is preferable that the resin film at the upper end of the new replacement part is not removed until the filtration device 1a is restarted after the replacement of the fiber part 4, and the upper end of the cylindrical part 2a is closed. This prevents or suppresses the flow of raw water (that is, water containing marine organisms) from the outside into the tube portion 2a between the completion of the replacement of the fiber portion 4 and the re-operation of the filtration device 1a. Can do. As a result, it is possible to prevent or suppress adhesion of marine organisms and the like to the tube portion 2a and the fiber portion 4 and propagation of marine organisms and the like in the tube portion 2a.

  The internal space of the new replacement unit may be filled with clean water instead of the drug solution. Even in this case, it is possible to prevent or suppress adhesion of marine organisms and the like to the tube portion 2a and the fiber portion 4 and propagation of marine organisms and the like in the tube portion 2a.

  Various modifications can be made in the above-described filtration devices 1 and 1a.

  For example, in the filtration device 1, the attachment of the fixing portion 31 to the support portion 32 may be performed by a method other than the above-described connection mechanism, binding band, or the like. For example, a weight is suspended downward from the fixed portion 31, and the weight is located below the support portion 32 and above the floor portion 22 of the cylindrical portion 2 (that is, the weight of the weight). The fixing part 31 may be pressed against the upper surface of the support part 32 by weight). In this case, attachment of the new exchange part 82 to the filtration device 1 is realized by moving the weight of the new exchange part 82 downward through the opening of the support part 32.

  In the fixing part 31, for example, the frame part 312 surrounding the periphery of the net part 311 may be omitted. Moreover, the fixing | fixed part 31 is not limited to the net-like member shown in FIG. 4, You may be a member which has various structures. For example, the fixing portion 31 may be a string-like or belt-like member to which the long fiber bundle elements 41 are respectively fixed at a plurality of positions in the longitudinal direction. In this case, the fixing portion 31 is disposed on the support portion 32 in a spiral shape or a circumferential shape, and is attached to the support portion 32.

  The suppression part 83 of the new replacement | exchange part 82 shown in FIG. 10 is not limited to a resin-made film member, You may change variously. For example, the suppressing part 83 may be a thin paper packaging member that wraps the fiber part 4 from the periphery. Alternatively, the suppressing portion 83 may be a cylindrical member made of hard resin (for example, made of polytetrafluoroethylene (PTFE)) surrounding the periphery of the fiber portion 4. The suppressing portion 83 may be a string-like or belt-like member that bundles the plurality of long fiber bundle elements 41 together. In any case, after the new replacement unit 82 is attached to the filtration device 1, the suppressing unit 83 is removed and removed. In addition, when the suppressing part 83 is a cylindrical member made of hard resin, and the outer diameter of the cylindrical member is substantially equal to the inner diameter of the upper space 201 of the cylindrical part 2, the suppressing part 83 is not removed and the cylindrical part 2 is removed. The filtration device 1 may be operated in a state of being disposed inside.

  Moreover, the suppression part 83 may be a water-soluble paste that hardens each long fiber bundle element 41 in a state of being stretched in the vertical direction. In this case, when a predetermined time elapses after the new replacement part 82 is attached to the filtration device 1, the glue melts and the fiber part 4 can be filtered. In addition, in the replacement | exchange of the fiber part 4 in the filtration apparatus 1, the suppression part 83 may be abbreviate | omitted from the new replacement | exchange part 82. FIG.

  In the replacement of the fiber part 4 in the filtration device 1, the supply of treated water to the lower space 202 (step S21) or the supply of chemicals to the lower space 202 (step S23) may be omitted. Alternatively, both step S21 and step S23 may be omitted. The same applies to the replacement of the fiber part 4 in the filtration device 1a.

  In the filtration devices 1 and 1a, the arrangement and number of the long fiber bundle elements 41 included in the fiber portion 4 may be changed as appropriate. For example, the arrangement of the plurality of long fiber bundle elements 41 is not limited to a concentric shape, and may be a lattice arrangement or a close-packed arrangement. The fiber part 4 may include only one long fiber bundle element 41.

  In the filtering device 1, the upper opening 23 of the cylinder part 2 does not necessarily have to be a region surrounded by the upper end edge of the cylinder part 2. For example, as shown in FIG. 14, the upper end of the cylindrical portion 2 may be closed, and the upper opening 23 may be located on the upper side surface of the cylindrical portion 2 (that is, the upper portion of the side wall portion 21). In this case, it is preferable that the upper end of the fiber part 4 in the stretched state (that is, the upper end of each long fiber bundle element 41) is located at substantially the same position in the vertical direction as the lower end of the upper opening 23. The same applies to the filtration device 1a.

  The cylindrical portions 2 and 2a are not necessarily limited to a cylindrical shape, and may be, for example, a rectangular cylindrical shape (that is, a rectangular parallelepiped shape). In the filtration devices 1 and 1a, the plurality of long fiber bundle elements 41 are preferably arranged at substantially equal intervals along the inner surface of the tube portions 2 and 2a, so that the tube portions 2 and 2a have a rectangular tube shape. In some cases, the plurality of long fiber bundle elements 41 are preferably arranged in a lattice pattern. The cylindrical portions 2 and 2a may be polygonal cylindrical shapes. Further, the cylindrical portions 2 and 2a may have a divergent or upwardly spreading truncated cone shape, or may be a divergent or upwardly expanding polygonal truncated cone shape.

  The replacement of the fiber part 4 in the filtration devices 1 and 1a is not necessarily performed in the raw water. For example, the filtration device 1 or 1a is pulled up on the ship by a crane or the like, and the fiber part 4 is exchanged on the ship. May be performed.

  The fiber part 4 is not limited to the above-mentioned long fiber bundle, and may be other various fiber filter media. For example, the fiber filter medium may be formed of short fibers. Further, for example, as in the filtration device 1b shown in FIG. 15, a molding fiber filter medium in which long fibers or the like are wound around the core yarn may be used as the fiber portion 4b. In FIG. 15, as in FIG. 3, a state during non-filtration in which raw water is not filtered in the filtration device 1 b is shown. The fiber part 4 b is a fiber filter medium that extends in the vertical direction with the lower end part fixed to the isolation part 3 in the upper space 201. The fiber part 4b includes a plurality of molding fiber elements 41b which are a plurality of fiber filter elements. The molding fiber element 41b may be a single molding fiber filter medium or a fiber bundle in which a plurality of molding fiber filter media are bundled. Similar to the fiber part 4, the fiber part 4 b is accommodated in the upper space 201 of the cylinder part 2 and fixed to the isolation part 3. The fiber part 4b is compressed on the isolation part 3 at the time of filtration, and captures suspended substances in the raw water flowing into the internal space 20 of the cylinder part 2 from the upper opening 23. In the filtration device 1b, an exchange part including at least a part of the fiber part 4b and at least a part of the isolation part 3 is detachable from the filtration device 1b (part other than the exchange part thereof).

  In the filtration device 1c illustrated in FIG. 16, a fiber part 4c including a plurality of spherical fiber masses 41c as fiber filter material elements is accommodated in the upper space 201 of the cylinder part 2a. In FIG. 16, as in FIG. 11, a state during non-filtration in which raw water is not filtered in the filtration device 1 c is shown. The diameter of the fiber mass 41c is, for example, about 10 to 50 mm when not compressed (that is, when not filtered). In the filtration device 1c, the lid portion 24 covers the upper opening 23 of the cylinder portion 2. The lid portion 24 is a member (for example, a grating or a wedge wire screen) through which liquid can pass. The plurality of openings provided in the lid portion 24 are smaller than each fiber lump 41c.

  Each fiber lump 41c is not fixed to the isolation part 3 and the cylinder part 2a, and is not connected to another fiber lump 41c. A large number of fiber masses 41c of the fiber part 4c are compressed onto the isolation part 3 during filtration, and capture suspended substances in the raw water flowing into the internal space 20 from the upper opening 23 via the lid part 24. The fiber mass 41c is not limited to a spherical shape, and may be, for example, a substantially cylindrical shape or a substantially prismatic shape. In the filtration device 1c, the exchange part including the whole fiber part 4c, the whole isolation part 3, and the whole upper cylinder part 25 can be attached to and detached from the filtration apparatus 1c (parts other than the exchange part).

  The tube portions 2 and 2a are not necessarily installed in the sea, and may be installed in various raw waters. In other words, the raw water filtered by the filtering devices 1 and 1a may be various water other than seawater. Moreover, if the cylinder parts 2 and 2a are the cylinder shape extended in an up-down direction and have the upper opening 23 open | released outside, it does not necessarily need to be a structure installed in water.

  For example, in the filtration device 1d shown in FIG. 17, a reservoir 2d installed on land is used as a cylindrical portion. Raw water (for example, river water or rainwater) flows into the reservoir 2d from the upper opening 23d opened to the outside (that is, a region surrounded by the upper edge of the reservoir 2d). In the reservoir 2d, the treated water that has passed through the fiber part 4 is sent out from the lower space 202 below the isolation part 3, and is supplied to the treated water reservoir 6 disposed below the reservoir 2d due to a head difference. Also in the filtration device 1d, as in the filtration device 1 shown in FIG. 1, the exchange part including at least a part of the fiber part 4 and at least a part of the isolation part 3 can be attached to and detached from the filtration device 1d. Thereby, replacement | exchange of the fiber part 4 in 1 d of filtration apparatuses can be made easy.

  The configurations in the above-described embodiments and modifications may be combined as appropriate as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 1,1a-1d Filtration apparatus 2,2a Tube part 2d Reservoir 3 Isolation part 4,4b, 4c Fiber part 5 Sending part 20 Internal space 23,23d Upper opening 25 Upper cylinder part 26 Lower cylinder part 41 Long fiber bundle element 41b Mall Fiber Element 41c Fiber Mass 81, 81a Exchanger 82 New Exchanger 83 Suppressor 201 Upper Space 202 Lower Space J1 Central Axis S11-S13, S21-S25, S31-S34 Steps

Claims (10)

A filtration device for producing treated water by filtering raw water,
A cylindrical portion extending in the vertical direction, and having an upper opening opened to the outside;
A separating part that divides the internal space of the cylindrical part vertically and allows liquid to pass through;
A fiber filter medium that is accommodated in an upper space that is an upper space of the isolation part, and is a fiber that captures suspended matter in raw water that has been compressed on the isolation part during filtration and flows into the internal space from the upper opening. And
A delivery unit that delivers treated water that has passed through the fiber part during filtration from a lower space that is a space below the isolation part;
With
A filtration device, wherein an exchange part including at least a part of the fiber part and at least a part of the isolation part is detachable from the filtration device. The filtration device according to claim 1,
The filtering device, wherein the cylindrical portion is disposed in the raw water in a state where the upper opening is positioned below the external raw water surface. The filtration device according to claim 1 or 2,
The filtration device, wherein the fiber part is a fiber filter medium extending in a vertical direction with a lower end part fixed to the isolation part in the upper space. The filtration device according to any one of claims 1 to 3,
The tube portion is
An upper cylinder portion having the upper opening at the upper end and the isolation portion being attached to the lower end portion;
A lower cylinder part detachably attached to a lower end of the upper cylinder part;
With
The filtration device, wherein the exchange part includes the whole of the fiber part, the whole of the isolation part, and the whole of the upper cylinder part. A cylindrical portion that extends in the vertical direction, an isolation space that divides the internal space of the cylindrical portion vertically and allows liquid to pass through, and a fiber filter medium that is accommodated in an upper space that is an upper space of the isolation portion A fiber part that captures suspended matter in raw water that has been compressed onto the isolation part during filtration and flows into the internal space from the upper opening; and the treated water that has passed through the fiber part during filtration is supplied to the isolation part. And a sending part that sends out from the lower space, which is a lower space, in a filtration device that produces raw water by filtering raw water, a fiber part exchange method for exchanging the fiber part,
The cylindrical portion has an upper opening opened to the outside;
a) removing an exchange part including at least a part of the fiber part and at least a part of the isolation part from the filtration device;
b) attaching a new replacement part corresponding to the replacement part to the part from which the replacement part has been removed;
The fiber part replacement | exchange method characterized by comprising. The fiber part replacement method according to claim 5,
In a state where the upper opening is located below the external raw water surface, the tube portion is disposed in the raw water,
The fiber part exchanging method, wherein the step a) and the step b) are performed below the raw water surface. The fiber part replacement method according to claim 5 or 6,
The fiber part exchange method, wherein the fiber part is a fiber filter medium extending in a vertical direction with a lower end fixed to the isolation part in the upper space. The fiber part replacement method according to claim 7,
In the new replacement part, the fiber part is prevented from being collected and spread, and the fiber part replacement method is characterized in that: The fiber part replacement method according to any one of claims 5 to 8,
In parallel with the step a) and the step b), water having a lower suspended solid content than raw water is supplied to the lower space. The fiber part replacement method according to any one of claims 5 to 9,
Prior to the step b), the fiber part replacement method is characterized in that the medicine is supplied to the lower space.

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