JP5706851B2 - Filter medium adhering substance removing device and filter medium adhering substance removing method - Google Patents

Description

  The present invention relates to a filter material adhering substance removing apparatus and a filter medium adhering substance removing method for removing adhering substances adhering to a used filter medium in order to repeatedly use the filter medium.

  The inventor of the present application has been working to regenerate and repeatedly use filter media for filter towers and filter ponds that filter river water, groundwater, etc. for water supply, and in the previous patent application, the adhering to the filter media In order to make it possible to remove dirt, a dehydrating cylinder having a water passage wall is provided inside the cylindrical casing, and a stirring shaft having a stirring blade for stirring a filter medium on the outer peripheral wall is further hollow inside the dehydrating cylinder. A filter medium cleaning device provided is proposed (see Patent Document 1).

  The filter medium cleaning device of Patent Document 1 stirs a filter medium by rotating a stirring shaft, and removes dirt attached to the surface of the filter medium by rubbing the filter medium and the filter medium.

JP 2011-140001 A

However, in the filter medium cleaning apparatus according to Patent Document 1, only the filter mediums are rubbed together by stirring. Metals such as magnesium, manganese, iron, calcium, and the like that are firmly adhered to the entire filter medium, manganese dioxide, calcium carbonate, magnesium carbonate In addition, it is difficult to sufficiently remove the adhesion of compounds such as silicon dioxide.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a filter medium coagulum removal apparatus and a filter medium coagulum removal method capable of effectively removing an aggregate that has been firmly adhered to the surface of the filter medium.

The invention made in order to solve the above-mentioned problems is provided with a cylindrical casing whose axial direction is the vertical direction, and a coaxial core provided inside the cylindrical casing, and a plurality of water passage holes provided in the side wall. and dehydrating tube, is inserted through the same axis shape to the dehydrating tube and a stirring shaft that is driven to rotate in the axis around the filter medium of the supplied granular between the agitation shaft and the dewatering cylinder A filter medium adhering matter removing device for removing adhering substances adhering to the surface of the filter medium by stirring, the first high-pressure water inlet and the first high-pressure water inlet for flowing high-pressure water from the outer opening to the inner opening of the water passage hole 2 and a high pressure water inlet, and the stirring shaft has a cylindrical shape, and the inner space forms an in-shaft cleaning chamber for cleaning the filter medium, and is provided at the upper end of the outer peripheral surface and is placed in the in-shaft cleaning chamber. A filter medium inlet for allowing the filter medium to flow in, and a filter medium provided at the lower part of the outer peripheral surface from the cleaning chamber in the shaft A slit-shaped filter medium outlet extending in the vertical direction to out, anda helical ridge provided on an outer peripheral surface between the filter media inlet to the filter media outlet, the spiral projection Article When the agitation shaft is driven to rotate, the filter medium is rubbed against the periphery of the inner openings of the plurality of water passage holes , and the first high-pressure water inlet is connected to the high-pressure water when the agitation shaft rotates. Is applied to the filter medium positioned between the spiral ridges to stir the filter medium, and the second high-pressure water inlet is configured to supply the high-pressure water when the stirring shaft rotates. The filter medium is configured to flow into the internal space from the filter medium outlet of the stirring shaft to stir the filter medium .

  The filter media adhering matter removing device according to the present invention is configured such that the spiral ridges provided on the outer peripheral surface of the stirring shaft rub the filter media against the inner opening periphery of the water passage hole of the dehydrating cylinder. It is possible to effectively remove a strong adhesive substance such as magnesium stuck to the surface of the filter medium.

In addition, the filter media adhering matter removing apparatus according to the present invention includes a high-pressure water inlet that feeds high-pressure water from the outer opening to the inner opening of the water passage hole, so that the filter medium and water The dirt accumulated in the hole can be removed from the water hole.

Furthermore, the filter medium adhesion material removal device according to the present invention, the first high-pressure water inlet is, during rotation of the stirring shaft being adapted to apply the high-pressure between the spiral ridge and the convex Therefore , the filter medium supplied between the spiral ridges can be stirred even with high-pressure water.

Moreover, in the filter media adhering matter removing apparatus according to the present invention, the stirring shaft includes an in-shaft cleaning chamber for cleaning the filter media therein, a filter media inlet for allowing the filter media to flow into the in-shaft cleaning chamber, and the inner shaft. A filter medium outlet for allowing the filter medium to flow out of the cleaning chamber, and the second high-pressure water inlet is configured to flow high-pressure water toward the filter medium outlet of the agitation shaft when the agitation shaft rotates. Therefore, the filter medium in the in-shaft cleaning chamber can be stirred with high-pressure water.

  In the filter media adhering matter removing apparatus according to the present invention, at least a part of the side wall of the dewatering cylinder is formed by arranging a plurality of wedge wires in a screen shape, and the water passage holes are adjacent wedge wires. It is preferable to consist of the gap | interval. By carrying out like this, the peripheral line of the vertical direction which cross | intersects the surrounding direction of a filter medium becomes long among the peripheral lines of the inner side opening of a water flow hole, and the stain | pollution | contamination of the filter medium surface can be removed efficiently.

The filter medium adhering matter removing method of the present invention is a method of removing the granular filter medium, the upper end of a stirring shaft having a cylindrical shape in which the axial center direction is a vertical direction and is inserted coaxially into a dehydrating cylinder having a plurality of water passage holes provided on a side wall. Flowing into the inner space of the stirring shaft from the filter medium inlet provided on the outer peripheral surface of the part, and supplying the space between the dehydrating cylinder and the stirring shaft, driving the stirring shaft around its axis, Agitating and cleaning the filter medium in the internal space, and spiral openings provided on the outer peripheral surface of the stirring shaft adjacent to the lower side of the filter medium inlet of the stirring shaft, the inner openings of the plurality of water passage holes While rubbing the filter medium around the periphery, the filter medium is stirred by applying high-pressure water to the filter medium located between the spiral ridges from the outside of the upper part of the dehydration cylinder, and the lower part of the dehydration cylinder From the outside of the water passage hole and the filter medium outlet of the stirring shaft Through it, by applying a high-pressure water to the filter media of the inner space, and removing the adhesion of the filter medium surface was stirred filter media.

  As described above, according to the filter material adhered product removing apparatus and the filter material adhered material removing method of the present invention, it is possible to effectively remove strong adhered materials adhered to the filter material surface.

(A) It is the schematic of 1st Embodiment which incorporates and uses the filter material adhering material removal apparatus of this invention in a filter material recycling system. (B) It is the schematic of 2nd Embodiment which uses independently the 3rd classification washing | cleaning apparatus incorporating the filter media adhering matter removal apparatus of this invention. It is a fragmentary sectional view of the filter media adhering matter removing apparatus of FIG. FIG. 3 is a perspective view of a dewatering cylinder of the filter material adhering matter removing apparatus shown in FIG. 2. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a bottom view of the stirring shaft of the filter material adhering matter removing apparatus shown in FIG. 2. FIG. 3 is an explanatory diagram showing the action of high-pressure water that is flowed from the outer opening to the inner opening of the water passage hole of the dewatering cylinder in the filter medium adhering matter removing apparatus shown in FIG. 2.

  Hereinafter, embodiments of the present invention will be described in detail with appropriate drawings. In addition, the filter material adhering matter removal apparatus of this invention is not restricted to the following embodiment.

(First embodiment)
FIG. 1 (a) shows a first embodiment in which a filter medium adhering matter removing apparatus 1 of the present invention is incorporated in a filter medium recycling system 10 and used.
The filter medium recycling system 10 is a system that collects the filter medium A from the filter tower (or filter pond) 14 and classifies and cleans the filter medium A for each particle size.

  As shown in FIG. 1 (a), the filter medium recycling system 10 includes a water tank 12, a water storage unit 13 fed from the water tank 12, and a first and second classifier that cleans and filters the filter medium A according to particle size. Cleaning units 15 and 16, and a coagulant removing unit 17 that separates water from the small-diameter filter medium A classified by the first classifying and cleaning unit 15 and removes the coagulant firmly adhered to the small-diameter filter medium A; The fine filter medium separator 18 for washing off sludge from the small-diameter filter medium, the cleaning / conveying means 11a and 11b for transporting the filter medium A while cleaning it using a so-called mixed-air jet pump, and the fine filter medium separator 18 Suction / conveyance means 11c for sucking and discharging the sludge washed off from the filter medium A with an air-jet jet pump is provided. As shown in FIG. 1 (a), the filter media coagulum removal apparatus 1 of this embodiment is included in the coagulum removal unit 17.

  As shown in FIG. 2, the filter media adhering substance removing device 1 includes a cylindrical casing 2, a dehydrating cylinder 3 provided inside the cylindrical casing 2, and a stirring shaft 4 inserted through the dehydrating cylinder 3. In addition to being provided mainly, a drive shaft 5 for rotating the stirring shaft 4 is provided.

  As shown in FIG. 2, the cylindrical casing 2 includes an upper cylinder 21 and a lower cylinder 22. At the side of the upper cylinder 21, a filter medium supply port 23 is provided for supplying the filter medium A for removing the adhering substance into the cylindrical casing 2, and the processed filter medium A is taken out at the lower end of the lower cylinder 22. A filter medium outlet 24 is provided. On the downstream side of the lower cylinder 22, a filter medium take-out pipe 6 for conveying the filter medium A discharged from the filter medium take-out port 24 to the downstream side of the filter medium recycling system 10 is provided. The take-out pipe 6 and the flange are connected.

On the side wall of the lower cylinder 22, a first high-pressure water inlet 25 and a second high-pressure water inlet 26 through which high-pressure water W from the pressurizing pump 7 (see FIG. 1A) flows into the lower cylinder 22. Is provided.

  As shown in FIG. 3, the dewatering cylinder 3 is a cylindrical member in which wedge wires 31, 31... Having a substantially isosceles triangular cross section are arranged in a screen shape to form a side wall. Fixing flange portions 32 and 33 (see FIG. 2, not shown in FIG. 3) are provided. The dehydrating cylinder 3 is fixed to a flange that connects the lower cylinder 22 to the upper cylinder 21 and the filter medium take-out pipe 6 with the flange portions 32 and 33 interposed therebetween. In the present embodiment, the gap between the wedge wires 31, 31... Corresponds to the water passage hole 34 on the side wall of the dehydrating cylinder 3. As shown in FIG. 3, the wedge wire 31 is arranged so that the apex of the isosceles triangle in the cross section is outward, the bottom is inward, and the water passage hole 34 is widened outward.

As shown in FIGS. 2 and 4, the stirring shaft 4 includes a cylindrical stirring shaft main body 41, a spiral protrusion 42 provided on the outer peripheral surface of the stirring shaft main body 41, a long plate-shaped stirring blade 43, and the like. It has.
The stirring shaft main body 41 includes an in-shaft cleaning chamber 41a for cleaning the filter medium A therein, and a filter medium inlet 44, 44 including a pair of substantially rectangular through holes through which the filter medium A flows into the in-shaft cleaning chamber 41a. Are provided with eight outlets 45, 45,... Made of slits through which the filter medium A flows out from the in-shaft cleaning chamber 41a. The filter medium outlets 45, 45... Are provided at equal angular intervals in the circumferential direction so as to extend in the axial direction of the stirring shaft main body 41.

  The spiral ridges 42 are provided on the outer peripheral surface from directly below the filter medium inlet 44 to a substantially intermediate position in the vertical direction of the stirring shaft main body 41. The stirring blades 43, 43,... Are radially provided on the outer peripheral surface of the stirring shaft main body 41 so as to contact the edge of the slit-shaped filter medium outlet 45.

  The upper and lower ends of the stirring shaft 4 are covered with end sleeves 46 and 47, respectively. The upper end sleeve 46 is provided with cylindrical portions on both upper and lower sides of the flange, and the upper end of the cylindrical portion of the lower end sleeve 47 is closed with a blind plate 48. As shown in FIGS. 4B and 4C, a pair of stirring blades 49 are provided on the lower surface of the flange portion of the end sleeve 47 on the lower end side. The blind plate 48 of the lower end sleeve 47 is provided with a through hole 48a through which a bolt for fixing the drive shaft 5 passes. A female screw hole (not shown) into which a bolt is screwed is provided at the lower end of the drive shaft 5, and the drive shaft 5 is penetrated from the cylindrical portion of the upper end sleeve 46, so that the lower end sleeve 47 has a lower end sleeve 47. The lower end is fixed to the blind plate 48 with a bolt. The drive shaft 5 is rotationally driven by the drive device 95 (see FIG. 1A) to rotationally drive the stirring shaft 4.

The high-pressure water W pressurized by the pressure pump 7 and flowing in from the first and second high-pressure water inlets 25 and 26 is sent from the outer opening of the water passage hole 34 of the dewatering cylinder 3 toward the inner opening. . As shown in FIG. 2, the first high-pressure water inlet 25 is provided at a height at which the stirring shaft 4 is provided with spiral ridges 42 on the outer periphery, and the high-pressure water W spirals when the stirring shaft 4 rotates. It is comprised so that it may contact the filter medium A between the protruding ridges 42 and the protruding ridges 42.
On the other hand, the second high-pressure water inlet 26 is provided at a height at which the stirring shaft 4 includes the filter medium outlet 45, and is configured to flow the high-pressure water W to the filter medium outlet 45 when the stirring shaft 4 rotates. Has been.

  As shown in FIG. 2, the filter medium outlet 24 of the lower casing 22 is configured to be closed by a closing tool 8 that can be opened and closed. Specifically, the obturator 8 includes a disk-shaped member 81 that opens and closes the lower opening 35 of the dehydrating cylinder 3, and an operation tool 82 that opens and closes by moving the cylindrical member 81 up and down by a screw operation. I have. When the disk-shaped member 81 is lowered by operating the operating tool 82, a gap is generated between the inner peripheral edge on the lower opening 35 side of the dehydrating cylinder 3 and the outer peripheral edge of the disk-shaped member 81. Filter medium A is taken out. The obturator 8 is a filter medium that can sufficiently remove the dirt adhering to the filter medium A by adjusting the size of the gap between the inner periphery of the lower opening 35 and the outer periphery of the disk-shaped member 81. Only A is taken out from the gap so that the dirt adhering to the filter medium A is not sufficiently removed, and the filter medium A having a large diameter can be left inside the dewatering cylinder 3.

Next, the operation of the filter medium recycling system 10 and the filter medium adhering matter removing apparatus 1 will be described.
In the filter medium recycling system 10 shown in FIG. 1 (a), first, when the pressurization pump 9 of the water storage unit 13 is activated, the water in the water storage unit 13 is pressurized and supplied to the cleaning / conveying means 11a equipped with a jet pump. Is done. Then, the filter medium A is sucked from the filter tower (or filter pond) 14 to the cleaning / conveying means 11a and is sent to the first classification cleaning unit 15 while being cleaned.

  The filter medium A fed to the first classification cleaning unit 15 is classified and collected for each particle size while being washed with fresh water sprayed from the cleaning nozzle 96 by the first classification cleaning unit 15 to the second classification cleaning unit 16. Is stored in a box 19. The filter medium A having the minimum diameter classified by the first classification cleaning unit 15 is directly sent to the fine filter medium separating device 18 and washed with water depending on the type of the filter medium A to be cleaned, dirt attached to the filter medium A, or the like. Before being sent to the fine filter medium separation device 18, it is sent to the third classification washing device 17 for further washing. The filter medium A sent to the agglomerated material removing unit 17 is sent to the filter material agglomerated material removing apparatus 1 after water is separated by the water separating unit 94.

  The filter medium A sent to the filter medium adhering matter removing device 1 is supplied into the cylindrical casing 2 from the filter medium supply port 23, and between the dewatering cylinder 3 and the stirring shaft 4 and from the filter medium inlet 44 into the shaft cleaning chamber. 41a. As the filter medium A supplied to the in-shaft cleaning chamber 41a flows down to the lower filter medium outlet 45, the filter media A rub against each other, and the adhered material on the surface is peeled off and separated.

  Further, the filter medium A sent to the filter medium adhering matter removing apparatus 1 is also supplied to the annular space between the dehydrating cylinder 3 and the stirring shaft 4 and stacked in an annular shape. The upper filter medium A stacked in an annular shape circulates around the stirring shaft 4 while being pressed downward by the rotating spiral ridges 42, and rubs against the upper and lower filter mediums A to peel off the adhering material on the surface. .

  Furthermore, the filter medium A stacked in an annular shape is pressed downward by the spiral ridges 42, and thus tends to spread in the radial direction of the dewatering cylinder 3 between the dewatering cylinder 3 and the stirring shaft 4. When the upper filter medium A is pushed by the spiral ridge 42 and the lower filter medium A is pushed by the stirring blade 43 and revolves around the stirring shaft 4, as shown in FIG. This is strongly rubbed against the corner portion 31a of the wedge wire 31, and this also peels off the adhered material on the surface.

The high-pressure water W pressurized by the pressurizing pump 7 and flowing in from the first and second high-pressure water inlets 25 and 26, as shown in FIG. Hole) 34 from the outer opening toward the inner opening. In this way, the high-pressure water W is removed from the filter medium A and is sandwiched between the wedge wires 31 (dirt and agglomerated material adhering to the filter medium A) D, and the agglomerated material is peeled off to reduce the size of the wedge wire 31. The filter medium A sandwiched between the gaps (water passage holes 34) is allowed to escape. Further, the high-pressure water W that flows in from the first high-pressure water inlet 25 and flows so as to hit the spiral ridge 42 is sandwiched between the spiral ridges 42 while the spiral ridge 42 rotates. The filter medium A collides with the filter medium A and is stirred and washed.

On the other hand, the high-pressure water W that has flowed in from the second high-pressure water inlet 26 flows toward the filter medium outlet 45 of the stirring shaft 4, enters the inside of the stirring shaft 4 from the filter medium outlet 45, and is centrifuged inside the stirring shaft 4. The filter medium A is effectively stirred and washed by pushing back the filter medium A that is blown outward by force.

  The cleaned filter medium A is discharged into the filter medium take-out pipe 6 from the gap between the inner wall of the dehydrating cylinder 3 and the disk-shaped member 81 together with the dirt D and the fragments broken off from the filter medium A by opening the opening / closing tool 8. Is done. By adjusting the size of the gap between the inner wall of the dehydrating cylinder 3 and the disk-like member 81, only the filter medium A, which has become smaller due to the removal of dirt on the surface, is discharged from the gap, and the dirt is sufficiently removed. The large filter medium A that does not peel can be kept inside the dehydrating cylinder 3.

  The filter medium A that has entered between the dehydrating cylinder 3 and the stirring shaft 4 and between the sleeve end 47 on the lower side of the stirring shaft 4 and the disk-like member 81 of the opening / closing tool 8 is stirred by the stirring blade 49, It is delivered to the gap between the disk-shaped member 81 and the dehydrating cylinder 3 by centrifugal force.

  Thus, the filter medium A and the dirt D discharged to the filter medium take-out pipe 6 and the fine fragments of the filtered filter medium A are sent to the fine filter medium separator 18 together with the water adhering to the filter medium A by the cleaning / conveying means 11b. The filter medium A is washed with water to remove the dirt D and debris, and is collected in the collection box 19.

  The fine filter medium separating device 18 is configured so that the sludge separated from the filter medium A and precipitated can be taken out from the take-out portion 91. When the on-off valve 92 is opened and the suction / conveying means 11c is driven, the sludge is sucked. , And discharged into the discharge box 93.

(Second Embodiment)
In the first embodiment, the case where the third classifying device 17 in which the filter material adhering matter removing device 1 is incorporated is used by being incorporated in the filter media recycling system 10 is shown, but the second embodiment shown in FIG. As described above, the third classifier 17 can be used independently from the filter medium recycling system 10.
In the second embodiment, as shown in FIG. 1B, a dedicated pressurizing pump 97 for pressurizing the high-pressure water W flowing from the first and second high-pressure water inlets 25 and 26 is separately provided. The filter medium A is input from the filter medium input port 97. The third classifying device 17 adjusts the size of the sieve mesh of the sieve 99, classifies and removes the small-diameter filter medium A with less agglomerated material in advance and collects it in the collection box 19, and the larger agglomerated material is larger. Only the filter medium A having a diameter is processed by the filter medium adhering substance removing apparatus 1. In this way, by removing in advance the filter medium with less agglomerated material, it is possible to treat only the filter material that requires removal of the agglomerated material, so that the agglomerated material can be efficiently removed.

The filter media adhering substance removing apparatus of the present invention is not limited to the above-described embodiment. For example, the side wall of the dewatering cylinder may be formed of a so-called punching metal or netting material instead of the wedge wire.
In addition, the plate-like member of the opening / closing tool is formed into a sieve shape with wedge wires, punching metal, netting material, etc., and the filter material that has been removed from the dirt is screened and discharged to the filter material take-out pipe. You may do it. The shapes of the filter medium inlet and the filter medium outlet are not limited to the above shapes, and the positional relationship between the filter medium inlet or the filter medium outlet and the spiral ridges is not limited to the above-described positional relationship.

  The filter media agglomerated material removal apparatus and filter material agglomerated material removal method of the present invention can effectively remove strong agglomerates on the surface of the media, so that filter media for filtration towers and filtration ponds for filtering lake water, river water, groundwater, etc. It can be suitably used for recycling.

DESCRIPTION OF SYMBOLS 1 Filter material adhering substance removal apparatus 2 Cylindrical casing 21 Upper cylinder 22 Lower cylinder 23 Filter material supply port 24 Filter material take-out port
25 First high-pressure water inlet
26 Second high-pressure water inlet 3 Dewatering cylinder 31 Wedge wire 31a Corner portion 34 Wedge wire gap (water passage hole)
35 Lower opening 4 Stirring shaft 41a In-shaft cleaning chamber 42 Spiral ridge 43 Stirring blade 44 Filter medium inlet 45 Filter medium outlet

Claims (4)

A cylindrical casing whose vertical direction is the axial direction, a dewatering cylinder provided coaxially inside the cylindrical casing and provided with a plurality of water passage holes on the side wall, and coaxial with the dehydrating cylinder is inserted into Jo and a stirring shaft that is driven to rotate in the axis around cohesion prepared by adhesion to a stirred by the filter medium surface filter media supplied granulated between the agitation shaft and the dewatering cylinder A filter media adhering substance removing device for removing,
A first high-pressure water inlet and a second high-pressure water inlet for feeding high-pressure water from the outer opening to the inner opening of the water passage hole;
The stirring shaft has a cylindrical shape, and the inner space constitutes an in-shaft cleaning chamber for cleaning the filter medium, and is provided at the upper end of the outer peripheral surface and has a filter medium inlet for allowing the filter medium to flow into the in-shaft cleaning chamber, A slit-shaped filter medium outlet that is provided in the lower part of the surface and extends in the vertical direction to allow the filter medium to flow out from the in-shaft cleaning chamber, and a spiral ridge provided on the outer peripheral surface between the filter medium inlet and the filter medium outlet And having
The spiral ridge is configured to rub filter material around the inner openings of the plurality of water passage holes when the stirring shaft is driven to rotate ,
The first high-pressure water inlet is configured to agitate the filter medium by applying the high-pressure water to the filter medium located between the spiral ridge and the ridge when the stirring shaft rotates.
The second high-pressure water inlet is configured to agitate the filter medium by flowing the high-pressure water from the filter medium outlet of the agitation shaft into the internal space when the agitation shaft rotates. Filter media adhesion removal device.   The stirring shaft includes an end sleeve that closes a lower end opening;
  The end sleeve includes an annular plate-like flange portion, a covered cylindrical portion extending upward from the center thereof, and a pair of long plate-like stirring members extending from the lower surface of the flange portion and extending in the radial direction of the stirring shaft. The filter media adhering matter removing apparatus according to claim 1, further comprising a blade.   At least a part of the side wall of the dewatering cylinder has a plurality of wedge wires arranged in a screen shape.
Is formed,
  The filter material adhering matter removing apparatus according to claim 1, wherein the water passage hole is formed by a gap between adjacent wedge wires. A filter medium inlet provided at the upper end of the outer peripheral surface of a stirring shaft having a cylindrical shape in which a cylindrical filter medium is coaxially inserted into a dehydration cylinder having a vertical axis direction and a plurality of water passage holes provided on a side wall. And flow into the inner space of the stirring shaft from the dehydration cylinder and the stirring shaft,
The stirring shaft is driven to rotate about its axis, the filter medium in the internal space is stirred and washed, and the spiral shaft is provided on the outer peripheral surface of the stirring shaft adjacent to the lower part of the filter medium inlet of the stirring shaft. By rubbing the filter medium around the inner opening periphery of the plurality of water passage holes,
  The filter medium is stirred by applying high-pressure water to the filter medium located between the spiral ridges from the outside of the upper part of the dehydrating cylinder, and the water hole from the outer side of the lower part of the dewatering cylinder. A filter medium adhering matter removing method comprising: applying high-pressure water to the filter medium in the internal space through the filter medium outlet of the stirring shaft, and stirring the filter medium to remove the adhering substance on the surface of the filter medium.

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