JP2013188689A - Filter element and filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter capable of effectively performing backwashing of the filter, and a filtering device capable of performing the backwashing of the filter simultaneously with filtration during a filtering process.SOLUTION: This cylindrical filter element 1 configured to filter treatment object water flowing inside with a filter 3 and to discharge the resulting water to the outside includes: a swirler body 4 which gives swirl flow to the treatment object water flowing inside of the filter element 1. The swirl flow of the treatment object water flowing inside the filter element 1 peels the dirt accumulated on the filter 3 by filtration, and a secondary flow caused by the swirl flow in the axial direction of the filter element 1 takes foreign substances to tangle with the filter 3 into this flow to prevent the foreign substances from tangling with the inner surface of the filter 3.

Description

  The present invention relates to a cylindrical filter element that filters out water to be treated that has flowed into the inside thereof and flows out to the outside, and a filtration device that uses this filter element.

  As a filter element used in filtration equipment that filters treated water such as ballast water stored in ships and contaminated water containing other pollutants, a thin metal plate with a large number of holes is formed in a cylindrical shape. The thing of the structure which provided the filter body in the cylindrical shape on the inner surface of the body is known (for example, refer patent document 1). In this filter element, one opening serves as a treated water inlet, the other opening is closed, and the treated water that has flowed into the filter element from the treated water inlet passes through the filter body on the inner peripheral surface and is filtered. And discharged to the outside.

  In the cylindrical filter element used in Patent Document 1, the treated water enters the inside of the filter element from the treated water inlet, passes through the filter in the radial direction, is filtered, and is discharged to the outside. Filter cake removed from the water to be treated by filtration with a filter provided on the inner peripheral surface of the support constituting the filter element accumulates on the inner surface of the filter, and the filter clogging progresses as the amount of accumulated filter cake increases. The filtration flow rate cannot be obtained sufficiently. For this reason, periodically or by detecting a decrease in the filtration flow rate, the filter cake deposited on the inner surface of the filter is removed by backwashing and the filter element is replaced.

JP-A-4-247204

  As described above, in the cylindrical filter element used in Patent Document 1, filter cake accumulates on the filter provided on the inner peripheral surface of the support, and the filtration flow rate cannot be obtained sufficiently. In such a case, a method of peeling and removing the filter cake deposited on the inner surface of the filter by backwashing or replacing the filter element is performed. Among these, the replacement work of the filter element is a work that involves disassembling and assembling the filtration device, which is troublesome and costly, and the filtration process is stopped during the replacement work. On the other hand, the cleaning effect of backwashing is also affected by the state of dirt attached during filtration. When a part of the dirt adheres to the filter during the filtration process, it is difficult to remove it only by backwashing. Backwashing is less labor-intensive than filter element replacement, but if it is not done effectively, the accumulation of filter cake, i.e. clogging, proceeds faster, shortening the cycle of backwashing. There exists a problem that processing efficiency falls.

  It is an object of the present invention to provide a filter capable of effectively performing backwashing of a filter and a filtration device capable of performing backwashing of the filter simultaneously with filtration during the filtration step.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a cylindrical filter element for filtering the water to be treated flowing into the inside and filtering the water to flow outside, and flows into the inside of the filter element. A swirl wing body that provides swirl to the treated water is provided.

  According to the first aspect of the present invention, at the time of filtration, one of the openings of the filter element is used as the treated water inlet, the other opening is closed, and the treated water flows into the filter element from the treated water inlet. Then, since the water to be treated is given a swirl flow by the swirl wing body, the pressure increases at the outer periphery of the swirl due to centrifugal force, but the pressure at the center decreases, so the secondary flow in the axial direction of the filter element Contaminants that are entangled with the filter can be taken into this flow to prevent entanglement of the inner surface of the filter, and the dirt accumulated by filtration can be removed by the swirling flow. The washing effect at the time of washing can be enhanced.

  The invention described in claim 2 is characterized in that a plurality of the swirl wing bodies according to claim 1 are provided in the axial direction of the filter element.

  According to the second aspect of the present invention, since a plurality of the swirl wing bodies are provided in the axial direction of the filter element, even if the flow rate of the water to be treated is decreased due to filtration, the swirl force inside the filter is decreased. The secondary flow can be effectively generated in the axial direction of the filter element without any swirling flow, and contaminants that get tangled in the filter can be taken into this flow to prevent entanglement on the inner surface of the filter. In addition, the dirt accumulated by filtration can be peeled off by the swirling flow, so that the cleaning effect at the time of backwashing can be enhanced.

  The invention described in claim 3 is characterized in that a granular floating body is accommodated in the downstream chamber of the swirl wing body inside the filter element according to any one of claims 1 and 2.

  According to the third aspect of the present invention, since the granular floating body is accommodated in the downstream chamber of the swirl wing body inside the filter element, the swirl wing according to the treated water swirled by the swirl wing body during filtration. The granular floating body accommodated in the downstream chamber of the body turns and collides with the inner surface of the filter by centrifugal force. By the collision of the granular floating bodies, the filter cake adhering to the inner surface of the filter can be crushed and separated, so that the inner surface of the filter can be more effectively cleaned during backwashing.

  According to a fourth aspect of the present invention, in the filter element according to any one of the first to third aspects, the inside of the filter element is partitioned in a direction crossing the axial direction of the filter element with a mesh body that does not allow the granular floating body to pass therethrough. It is characterized by being.

  According to a fourth aspect of the present invention, the inside of the filter element is partitioned in a direction crossing the axial direction of the filter element by a mesh body that does not allow the granular floating body to pass through. When the wash water that has flowed through and passed through the inside is discharged from the inlet of the water to be treated, the granular floating body can be prevented from flowing out of the filter element by the mesh.

  The invention according to claim 5 is the mesh according to claim 4, wherein when the plurality of swirl wing bodies are provided, a plurality of reticulate bodies are provided in accordance with the spacing of the swirl wing bodies, and the mesh structure is positioned vertically. The granular floating bodies are accommodated between the bodies, respectively.

  According to a fifth aspect of the present invention, when a plurality of the swirl wing bodies are provided, a plurality of the reticulate bodies are provided in accordance with the spacing of the swirl wing bodies, and the reticulate bodies are respectively disposed between the reticulate bodies positioned above and below. Since the granular floating bodies are accommodated, the granular floating bodies are held in the filter element in the axial direction at intervals of the swirl wing bodies, and are accommodated between the mesh bodies positioned above and below during filtration. The granular floating body swung according to the water to be treated swung by the swirl wing body, and uniformly collides with the inner surface of the filter over the entire axial direction of the filter element. By the collision of the granular floating bodies, the filter cake adhering to the entire inner surface of the filter can be crushed and peeled off, so that the inner surface of the filter can be more effectively cleaned during backwashing.

  The invention according to claim 6 is a filtration device, wherein a plurality of the filter elements according to any one of claims 1, 2, 3, 4 or 5 are arranged in a chamber. To do.

  According to the invention described in claim 6, since a plurality of the filter elements according to any one of claims 1, 2, 3, 4 or 5 are arranged in the chamber, A specific filter element is selected arbitrarily, the treated water inlet (backwash water outlet) of the selected filter element is connected to the cleaning wastewater discharge passage, and the treated water inlet and treated water of other filter elements are connected. A process for filtering the water to be treated by connecting the water introduction path and allowing the water to be treated to flow into the filter element from the treated water introduction path, and for backwashing the filter with a part of the filtered water The backwashing step of backwashing the filter by using it as water can be performed at the same time, so that the water to be treated can be efficiently filtered and backwashed.

  According to the present invention, the swirl vane body that provides the swirling flow to the water to be treated that flows into the filter element is provided. Therefore, the secondary flow is generated in the axial direction of the filter element by the swirling of the water to be treated at the time of filtration. In addition, it is possible to prevent the entanglement of the contaminants that are entangled in the filter into this flow and prevent the entanglement of the inner surface of the filter, and the dirt accumulated by filtration can be peeled off by the swirling flow. The cleaning effect can be enhanced. As a result, accumulation of filter cake on the inner surface of the filter can be suppressed, and a decrease in the filtration flow rate can be suppressed, so the backwashing and replacement cycle of the filter element can be lengthened, and the filter element replacement work and cost can be reduced accordingly. Can do.

It is sectional drawing which shows the 1st example of embodiment of the filter element which concerns on this invention. FIG. 2 is a partially omitted plan view of FIG. 1. It is a perspective view which shows an example of the swirl | wing body used in this example. It is explanatory drawing which shows the state at the time of filtration of a 1st example. It is sectional drawing which shows the 2nd example of embodiment of the filter element which concerns on this invention. It is explanatory drawing which shows the state at the time of filtration of a 2nd example. It is sectional drawing which shows the 3rd example of embodiment of the filter element which concerns on this invention. It is explanatory drawing which shows the state at the time of filtration of a 3rd example. It is a partial schematic sectional drawing which shows an example of embodiment of the filtration apparatus which concerns on this invention.

Hereinafter, embodiments of a filter element according to the present invention will be described in detail with reference to the drawings.
1 to 3 show a first example of an embodiment of a filter element according to the present invention. FIG. 1 is a sectional view of this example, FIG. 2 is a partially omitted plan view of FIG. 1, and FIG. FIG. 4 is a perspective view showing an example of a swirl wing used in this example, and FIG. 4 is an explanatory view showing a state during filtration of the first example.

The filter element 1 of this example includes a sleeve 2, a filter 3, a fixing member 4, a swirl wing body 5, and a screw shaft 6 that fixes the swirl wing body 5 at an arbitrary position. In the cylindrical filter element 1, A swirl wing body 5 is provided to swirl the flow of the water to be treated that has flowed into the filter element 1.
The filter 3 of the filter element 1 includes a filtration layer 7 and a support layer 8 that also overlaps the outside of the filtration layer 7 and also serves as a reinforcing material for maintaining the cylindrical shape of the filtration layer 7. In this example, the filtration layer 7 is a known metal mesh having a # 450 mesh, and the support layer 8 is a # 80 metal mesh. In the support layer 8, punching metal or the like is used in addition to the metal net, but there is no particular limitation as long as the filter layer 7 can be supported in a cylindrical shape.
The sleeve 2 is provided at the opening end of the filter element 1 to form the opening of the filter element 1, and an O-ring groove 9 is provided on the outer periphery thereof.
In this example, one opening of the filter element 1 configured as described above serves as a water inlet 10 to be treated (a backwashing water outlet 11 during backwashing), and the other opening is provided on the bottom plate of the filtration device described later. It is fixed by being inserted into the fixed seat and closed.

  Further, in the swirl wing body 5 provided in the filter element 1, in this example, as shown in FIG. 3, it has a disc shape having an outer diameter corresponding to the inner diameter of the filter element 1. A plurality of wing parts 12 having a spiral inclined surface arranged in the centrifugal direction from the part are provided, and a hole 13 through which the screw shaft 6 passes is formed at the center.

In this example, the swirl wing body 5 is provided in the filter element 1 with the following configuration, and is fixed in the filter element 1 as follows.
First, the screw shaft 6 is passed through the cylindrical portion 14 at the center of one fixing member 4, and the fixing member 4 is fixed to the end of the screw shaft 6 with a nut 15. The fixing member 4 includes an outer frame portion 16 formed with an outer diameter slightly smaller than an inner diameter of the sleeve 2 provided at both opening ends of the filter element 1, a cylindrical portion 14 through which the screw shaft 6 passes, and a cylindrical portion 14 and four ribs 17 that connect the outer frame portion 16 to each other.
Next, the screw shaft 6 is inserted into the hole 13 formed at the center of the swirl wing body 5, and is clamped and fixed at a desired position by a nut 18. And it fixes so that the front-end | tip part of the screw shaft 6 may not protrude from the end surface of the filter element 1 to the cylindrical part 14 of the other fixing member 4. The screw shaft 6 to which the two fixing members 4 and the swirl wing body 5 are fixed is inserted into the filter element 1, and the outer frame portion 16 is fixed to the sleeve 2 by fixing means (not shown) such as screws.

  When the water to be treated is caused to flow into the filter element 1 of the present example configured as described above from the water inlet 10 to be treated, the water to be treated is swirled by the swirling blade body 5 as shown in FIG. Is swirled as a swirl flow A, passes through the filter 3, is filtered, and is discharged to the outside. Although the pressure at the outer periphery of the swirl increases due to centrifugal force, the pressure at the center decreases, so that a secondary flow B can be generated in the axial direction of the filter element, and a lightweight contaminant that can be entangled with the filter 3. (For example, diatoms) can be taken into this flow to prevent the inner surface of the filter 3 from being entangled, and the dirt accumulated by filtration can be removed by the swirl flow A. Can be increased.

5 and 6 show a second example of the embodiment of the filter element according to the present invention. FIG. 5 is a cross-sectional view of this example, and FIG. 6 is an explanatory view showing a state during filtration of this example. is there.
About the filter element 1 of this example, the same code | symbol is attached | subjected about the structure same as the said 1st example, the description is abbreviate | omitted, and only a structure different from a 1st example is demonstrated.

As in the first example, the filter element 1 of this example is provided with a swirl wing body 5 that swirls the water to be treated that has flowed into the filter element 1. In this example, a plurality of swirl wing bodies 5 are provided in the axial direction of the filter element 1, and the rest of the configuration is the same as that of the first example.
The number and interval of the swirl wing bodies 5 are not particularly limited, but the water to be treated flowing from the treated water inlet 10 of the filter element 1 is moved downstream in the axial direction from the treated water inlet 10 of the filter element 1. By being discharged to the outside while being filtered, the flow rate of the water to be treated decreases toward the downstream side in the filter element 1, and the swirling speed of the water to be treated given by the swirling blade body 5 also decreases. It is preferable to appropriately change the number and interval of the swirl wing bodies 5 in accordance with a decrease in the flow rate of the water to be treated so that the swirling speeds of the water to be treated given by the body 5 are substantially equal. In this example, the spacing between the swirl wing bodies 5 is provided so as to become narrower toward the downstream side.
In the plurality of swirl wing bodies 5, the screw shaft 6 is inserted into the hole 13 formed at the center of the swirl wing body 5 as in the first example, and the plurality of swirl wing bodies 5 are inserted into the screw shaft 6 at desired intervals. Fix it. The swivel wing body 5 is fixed to the screw shaft 6 with no particular limitation. In this example, the swivel wing body 5 between the cylindrical portion 14 at the center of the fixing member 4 and the swirl wing body 5 A spacer 19 is provided and fixed between the next swirl wing body 5.

  According to the filter element 1 of the present example configured as described above, when the water to be treated is caused to flow from the water inlet 10 to be treated, the water to be treated is fed to the filter 3 by the swirl wing body 5 as shown in FIG. It flows while turning on the inner peripheral surface as a swirl flow A, passes through the filter 3 and is filtered. Although the flow rate of the water to be treated decreases with the filtration, since the swirl wing bodies 5 are arranged at narrower intervals as they go downward, the swirl force inside the filter 3 is not reduced, and the filter element The secondary flow B can be effectively generated in the axial direction. Therefore, the secondary flow B can take in foreign matters entangled with the filter 3 into the flow and prevent the inner surface of the filter 3 from being entangled, and remove the dirt accumulated by filtration with the swirl flow A. Therefore, the cleaning effect at the time of backwashing can be enhanced.

7 and 8 show a third example of the embodiment of the filter element according to the present invention. FIG. 7 is a cross-sectional view of this example, and FIG. 8 is an explanatory view showing a state during filtration of this example. is there.
About the filter element 1 of this example, the same code | symbol is attached | subjected about the structure same as a 2nd example, the description is abbreviate | omitted, and only a structure different from a 2nd example is demonstrated.

  Similar to the second example, the filter element 1 of this example is provided with a plurality of swirl wing bodies 5 that swirl the water to be treated that has flowed into the filter element 1. In this example, a large number of granular floating bodies 21 are accommodated in the downstream chambers 20 of the swirling wing bodies 5 inside the filter element 1. The granular floating body 21 is preferably one having a relatively low specific gravity such as plastic beads. In this example, the granular floating bodies 21 having a specific gravity of 0.5 to 1.5 are mixed and accommodated. In addition, the shape is preferably spherical or cylindrical.

Further, in the present example, a reticulated body 22 that does not allow the granular floating body 21 that partitions the inside of the filter element 1 in a direction intersecting the axial direction to be provided in the vicinity of the upstream side of each swirl wing body 5 is provided inside the filter element 1. ing. A hole through which the screw shaft 6 is passed is formed at the center of the mesh body 22.
The mesh body 22 is fixed in the vicinity of the upstream side of each swirl wing body 5 that is inserted into a hole formed in the center and is fixed to the screw shaft 6. Although there is no particular limitation on the fixing of the mesh body 22 to the screw shaft 6, in this example, the swirl wing body 5 and the mesh body between the cylindrical portion 14 and the mesh body 22 at the center of the fixing member 4 are used. A spacer 23 is provided between and fixed to 22.

  According to the filter element 1 of the present example configured as described above, when the water to be treated is introduced from the water inlet 10 to be treated, the water to be treated is fed to the filter 3 by the swirl wing body 5 as shown in FIG. It flows while turning on the inner peripheral surface, passes through the filter 3 and is filtered. Although the flow rate of the water to be treated decreases with the filtration, since the swirl wing bodies 5 are arranged at narrower intervals as they go downward, the swirl force inside the filter 3 is not reduced, and the filter element The secondary flow B can be effectively generated in the axial direction. Therefore, the secondary flow B can take in foreign matters entangled with the filter 3 into the flow and prevent the inner surface of the filter 3 from being entangled, and remove the dirt accumulated by filtration with the swirl flow A. Therefore, the cleaning effect at the time of backwashing can be enhanced.

In this example, since a large number of granular floating bodies 21 are accommodated in the downstream chamber 20 of the swirl wing body 5 inside the filter element 1, the swirl wings correspond to the treated water swirled by the swirl wing body 5 during filtration. The granular floating body 21 accommodated in the downstream chamber 20 of the body 5 turns and repeatedly collides with the inner surface of the filter 3 by centrifugal force.
In particular, the swirl wing body 5 is provided in a plurality of stages so that the swirl speed does not decrease even if the flow rate of the water to be treated is reduced by filtration, and the granular floating bodies 21 are accommodated in the downstream chambers 20 of each swirl wing body 5. The collision with the inner surface of the filter 3 is performed more effectively. Since the filter cake adhering to the inner surface of the filter 3 is crushed by the collision of the granular floating bodies 21, the accumulation speed of the filter cake of the filter 3 is slowed, and the time interval for backwashing the filter 3 can be widened. The cleaning effect at the time of backwashing can be enhanced.
Further, when the filter 3 is backwashed, when the backwash water flowing through the filter 3 from the outside to the inside is discharged from the backwash water outlet 11, the granular floating body from the filter element 1 by the mesh body 22 21 can be prevented from flowing out.

FIG. 9 is a partial schematic sectional view showing an example of an embodiment of a filtration device using the filter element according to the present invention.
The filtration device 24 of this example is detachably attached to a cylindrical chamber 25 and an upper opening, and includes a header 26 that closes the upper opening of the chamber 25, and the chamber 25 and the header 26 are detachable by a flange 27. It is connected. The interior of the chamber 25 is a treated water chamber 28, and the interior of the header 26 is a treated water introduction chamber 29.
The chamber 25 closes the lower opening of the filter element 1 by providing a top plate 31 provided with holes 30 for inserting a plurality of filter elements 1 and a cylindrical fixing seat 32 at a position corresponding to the holes 30. A bottom plate 33 is provided, and a treated water discharge passage 34 through which filtered water is discharged is connected.

  In the filter element 1 inserted into the chamber 25 through the hole 30 provided in the top plate 31, the sleeve 2 forming the opening at the lower end is inserted into the fixed seat 32 of the bottom plate 33 and attached to the O-ring groove 9 of the sleeve 2. The O-ring 35 seals between the fixed seat 32 and the sleeve 2, and the sleeve 2 forming the upper end opening is supported by a hole 30 provided in the top plate 31, and is attached to the O-ring groove 9 of the sleeve 2 on the upper end side. The gap between the hole 30 provided in the top plate 31 and the sleeve 2 is sealed by the O-ring 35.

A cleaning sewage discharge pipe 36 is attached to the central portion of the chamber 25 so as to penetrate the top plate 31 and the bottom plate 33. An upper end of the cleaning contaminated water discharge pipe 36 protrudes into the treated water introduction chamber 29, and an arm rotation base 37 serving as a rotation center of an arm described later is mounted in a liquid-tight and rotatable manner on the protruding end. ing. The arm rotation base 37 is provided with a tubular arm 38 for allowing the treated water inlet 10 (backwash water outlet 11) of the filter element 1 and the arm rotation base 37 to communicate with each other.
The front end opening of the arm 38 is provided with a backwash water connection port 39 that can be liquid-tightly connected to a position facing the treated water inlet 10 (backwash water outlet 11) of the filter element 1. By rotating 37, the backwash water connection port 39 slides on the top surface of the top plate 31, and this backwash water connection port 39 coincides with the treated water inlet 10 (backwash water outlet 11) of the filter element 1. By stopping the rotation of the arm rotation base 37 at the position, it is possible to connect the treated water inlet 10 (backwash water outlet 11) of the filter element 1 opening to the top plate 31 in a liquid-tight manner. Then, when the arm rotation base 37 rotates again, it is detached from the treated water inlet 10 (backwash water outlet 11) of the filter element 1.

The arm rotation base 37 is provided with a rotating means 40 that rotates the arm rotation base 37 from the outside of the header 26.
The lower end of the cleaning sewage discharge pipe 36 protrudes from the bottom plate 33, and a cleaning sewage discharge passage 41 is connected to the protruding end.
The header 26 is connected to a treated water introduction path 42 for introducing treated water into the treated water introduction chamber 29.

A plurality of filter elements 1 are arranged in the filtration device 24 configured as described above. When it is determined that the backwashing is necessary based on the increase in the differential pressure before and after the filtration device 24 and the change in the physical quantity such as the operation time, the backwashing is sequentially performed on the plurality of filter elements 1.
In the backwashing process, the backwashing water connection port 39 of the arm 38 is connected to the treated water inlet 10 (backwashing water outlet 11) of the filter element 1 by rotating the arm rotation base 37 by the rotating means 40. Since this filter element 1 communicates with the cleaning sewage discharge passage 41 at atmospheric pressure, the pressure inside the chamber 25, that is, the pressure outside the filter element 1 becomes higher than the pressure inside the filter element 1, and FIG. As shown, the water flow is reversed. That is, the filter 3 is washed by backflowing a part of the water filtered by the other filter element 1 in the filtration process from the outside to the inside of the filter element 1 in the backwash process. The cleaning sewage containing the filter cake separated from the filter 3 flows through the arm 38 to the cleaning sewage discharge pipe 36 and is discharged from the cleaning sewage discharge path 41 to the outside of the filtering device 24.

  Thus, since a part of the filtered water of the filtration device 24 is used in the backwashing step, the number of the filter elements 1 that obtain the filtration capacity required for the filtration device 24 is the filter element in the backwashing step. It must be equal to or greater than the number of filter elements obtained by subtracting the number 2N obtained by adding the number N and the number N of filter elements that make up the filtered water used for this backwashing.

  The backwashing process is started after connecting the backwash water connection port 39 of the arm 38 to the filter element 1 that performs backwashing, and when a predetermined time has passed, the water treatment target 10 of the adjacent filter element 1 is rotated by the rotating means 40. The arm rotation base 37 is rotated so that the (backwash water outlet 11) and the backwash water connection port 39 of the arm 38 overlap. In this way, the filter 3 is backwashed sequentially.

  As described above, according to the filtering device 24 of this example, the water to be cleaned and the filter element 1 can be back-washed at the same time, and the filter element 1 in the filtering step is simultaneously peeled off and washed with the filter cake attached to the inner surface. Therefore, the backwashing of the filter element 1 in the backwashing process that has undergone such a filtration process can be performed effectively.

DESCRIPTION OF SYMBOLS 1 Filter element 2 Sleeve 3 Filter 4 Fixing member 5 Swivel blade body 6 Screw shaft 7 Filtration layer 8 Support layer 9 O ring groove 10 Water to be treated inlet 11 Backwash water outlet 12 Wing 13 Hole 14 Cylindrical part 15 Nut 16 Outside Frame portion 17 Rib 18 Nut 19 Spacer 20 Downstream chamber 21 Granular fluid 22 Reticulated body 23 Spacer 24 Filtration device 25 Chamber 26 Header 27 Flange 28 Treated water chamber 29 Treated water introduction chamber 30 Hole 31 Top plate 32 Fixed seat 33 Bottom plate 34 Treated water discharge path 35 O-ring 36 Washed wastewater discharge pipe 37 Arm rotation base 38 Arm 39 Backwash water connection port 40 Rotating means 41 Washed wastewater discharge path 42 Treated water introduction path

Claims (6)

A cylindrical filter element for filtering the water to be treated flowing into the inside and filtering it out to the outside,
A filter element comprising a swirl wing body that imparts a swirl flow to the water to be treated that has flowed into the filter element.   The filter element according to claim 1, wherein a plurality of the swirl wing bodies are provided in the axial direction of the filter element.   3. The filter element according to claim 1, wherein a granular floating body is accommodated in the downstream chamber of the swirl wing body inside the filter element.   The filter element according to any one of claims 1 to 3, wherein the inside of the filter element is partitioned in a direction intersecting with an axial direction of the filter element by a mesh body that does not allow the granular floating body to pass therethrough. .   When a plurality of swirl wing bodies are provided, a plurality of the reticulate bodies are provided in accordance with the spacing between the swirl wing bodies, and the granular floating bodies are accommodated between the reticulate bodies positioned above and below, respectively. The filter element according to claim 4.   A filtering device comprising a plurality of filter elements according to any one of claims 1, 2, 3, 4 and 5 arranged in a chamber.

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