JP4513670B2 - Multiple disk dehydrator - Google Patents

Description

  The present invention relates to a multiple disk dewatering device that separates solids and filtrates by filtering sewage sludge, human waste sludge, and other industrial waste sludge.

  One of the filtration devices that separate sewage sludge, human waste sludge, and other industrial waste sludge to separate solids and filtrates is a multiple disk dewatering device.

  Conventionally, as a multiple disk dewatering device, there is one disclosed in Patent Document 1. An outline of such a multiple disk dewatering device will be described with reference to FIG.

  The multiple disk dewatering apparatus mainly includes a multiple disk dewatering machine 1 and an aggregating device 2 connected to the multiple disk dewatering machine 1.

  In the multiple disk dehydrator 1, an upper filter body group 4 and a lower filter body group 5 are arranged in the dehydration tank 3 so as to form a cake transport path 6. The cake transport path 6 The sectional area gradually decreases toward the downstream side, the downstream end opens on the wall surface of the dehydration tank 3 to form the discharge port 10, and the upstream side of the upper filter group 4 is connected to the lower filter group 5. On the other hand, the upper surface of the upstream end portion of the cake conveying path 6 is open.

  The upper filter body group 4 and the lower filter body group 5 are configured so that a required number of filter bodies 7 are partially polymerized, and the filter bodies 7 are formed on both side walls of the dehydration tank 3. The upper filter body group 4 and the lower filter body group 5 are driven so as to rotate toward the downstream side by a driving device (not shown).

  The filter body 7 has a large number of discs 9 fixed to the rotating shaft 8 via spacers (not shown), and the discs 9 and 9 of the adjacent filter bodies 7 and 7 are in the gaps formed by the spacers. A part is inserted and a part is superposed, and a gap formed between the discs 9 and 9 of the adjacent filter bodies 7 and 7 becomes an eye for filtering the liquid. The filter body 7 is formed with a filtrate passage 11 passing through the disk 9 and the spacer in the axial direction, and the filtrate leaked into the filtrate passage 11 is passed through the filtrate passage 11 to the shaft end of the filter body 7. Then, the water is discharged from the side wall of the dehydration tank 3.

  The aggregating apparatus 2 has an aggregating tank 12, and the aggregating tank 12 is connected to the dehydrating tank 3 through an aggregating stock solution supply port 13. The coagulation tank 12 is connected to a stock solution supply line 14 and a coagulation liquid supply line 15. The coagulation tank 12 is supplied with a stock solution from the stock solution supply line 14 by a stock solution supply pump 16, and from the aggregate solution supply line 15. The aggregating liquid is supplied from the aggregating liquid supply pump 17.

  The agglomeration tank 12 is provided with a stirrer 18, and the agitation liquid is agitated by the agitator 18, thereby aggregating solids in the undiluted liquid.

  By supplying the stock solution from the stock solution supply line 14 and the aggregate solution from the aggregate solution supply line 15, the aggregate stock solution 19 overflows from the aggregate stock solution supply port 13 and is supplied to the dehydration tank 3. The supply amount of the agglomerated stock solution 19 is adjusted so as to form a free liquid level 21 at the upstream end opening portion of the cake transport path 6.

  The agglomerated stock solution 19 supplied to the cake transport path 6 is separated into filtrates by gravity filtration at the upstream portion of the cake transport path 6, and most of the separated filtrate is between the disks 9, 9. It falls from the eyes, and the remaining part leaks into the filtrate passage 11 and is discharged from the side wall of the dehydration tank 3 through the filtrate passage 11.

  The separated flocs that have been separated land on the lower filter body group 5 and are conveyed downstream by the rotation of the upper filter body group 4 and the lower filter body group 5. In addition, the aggregated floc is squeezed by the upper and lower upper filter body groups 4 and the lower filter body group 5 in the conveying process, and the filtrate is separated into a cake. That is, a gravity dewatering part is formed in the upstream part of the cake conveyance path 6, and a pressing dewatering part is formed in the downstream part.

  Most of the filtrate separated by the pressure falls through the eyes between the discs 9 and 9, falls below the lower filter body group 5, and the remainder leaks into the filtrate passage 11, and the filtrate passage 11 And is discharged from the side wall of the dehydration tank 3.

  Further, the dehydrated cake is discharged from the discharge port 10 by the conveying action of the upper filter body group 4 and the lower filter body group 5.

  In the above-described conventional multiple disk dewatering device, when the filtrate leaks into the filtrate passage 11, the flocs flocs may also leak together. When the operating time of the multiple disk dewatering device becomes long, the filtrate passage It is conceivable that 11 is clogged by the leaked flocs. For this reason, it is necessary to remove the aggregation floc accumulated in the filtrate passage 11 as appropriate.

  An example of a multiple disk dewatering device having a configuration for washing the filtrate passage 11 is disclosed in Patent Document 2.

  In the conventional multiple disk dewatering device shown in Patent Document 2, jet water is sprayed toward the filtrate passage 11 to remove clogged aggregated floc.

  However, in the conventional multiple disk dewatering device, jet water is jetted in parallel with the axis of the filtrate passage 11 to penetrate the filtrate passage 11, and flocs adhering to the wall surface of the filtrate passage 11 are removed. It was not enough to remove.

  In the above-described conventional multiple disk dewatering device, the filtrate separating action at the upstream portion of the cake conveying path 6 is liquid separation by gravity. Further, the eyes through which the filtrate passes are only gaps formed in the portion where the adjacent filter bodies 7 and 7 are superposed, and the filtration area formed in the lower filter body group 5 is small and effective filtration. It is difficult to obtain the effect. When sufficient dehydration does not proceed in the gravity dewatering section, the moisture content of the cake that has entered the press dewatering section is large, and an effective pressing action cannot be obtained. Furthermore, when the dehydrating action in the gravity dehydrating part is small, the free liquid level 21 is slow to be slow and the supply amount of the stock solution and the like is limited, and an increase in the processing amount cannot be expected.

  Alternatively, since the upstream portion of the cake conveying path 6 and the discharge port 10 are both open to the atmosphere, the moisture content of the cake cannot be controlled, and the moisture content of the cake varies depending on the state of the stock solution being processed. There was a problem such as.

JP 2004-330060 A

JP 2005-7327 A

  In view of such circumstances, the present invention eliminates clogging of the filtrate passage and also enables removal of coagulated floc attached to the wall of the filtrate passage, increasing the amount of filtrate discharged from the filtrate passage, and improving the filtration effect. Try to increase.

  According to the present invention, a filter body constituted by alternately and repeatedly fitting a disc on a rotatable shaft body and spacers having a smaller diameter than the disc is continuously provided so that a part of the disc is superposed. In a multiple disk dewatering device having a filter body group that is filtered through a gap between the overlapping portions of the disk, a filtrate passage that penetrates the disk and the spacer is formed to leak into the filtrate passage. The filtrate is discharged from the shaft end of the filter body, and a cleaning nozzle is provided for injecting a jet water flow toward the filtrate passage. The jet water flow can pass through the filtrate passage and the injection direction is the filtrate passage. The present invention relates to a multiple disk dewatering device that is inclined with respect to the axis of the nozzle, and also relates to a multiple disk dewatering device in which a plurality of cleaning nozzles are provided so that the inclination of the jet direction of the jet water flow is different. It is.

  Further, the present invention provides a groove extending in the radial direction to the spacer and having one end opened in the passage hole and the other end opened in the circumferential surface of the spacer, and the filtrate leaks into the passage hole through the groove. This relates to a disk dewatering device.

  According to the present invention, a filter body constituted by alternately and repeatedly inserting a disk and a spacer having a smaller diameter than the disk on a rotatable shaft body, a required number of consecutive disks are superposed. In a multi-disk dewatering device comprising a filter body group configured to filter through a gap between overlapping portions of the disk, a filtrate passage that penetrates the disk and the spacer is formed to form the filtrate passage The filtrate leaked from the filter body is discharged from the shaft end of the filter body, and a cleaning nozzle is provided for injecting a jet water flow toward the filtrate passage. The jet water flow can pass through the filtrate passage and the injection direction is Since it is inclined with respect to the axis of the filtrate passage, the jet water stream collides with the wall surface of the filtrate passage, and the collision position of the jet water stream moves with the rotation of the filter body, and the entire length of the wall surface is washed. And the jet stream is the filtrate. Since passing through the road it can also be performed elimination of clogging.

  According to the present invention, a groove extending in the radial direction to the spacer, having one end opened in the passage hole and the other end opened in the circumferential surface of the spacer is formed, and the filtrate leaks into the passage hole through the groove. Since it did in this way, the peripheral surface of a spacer also contributes to a filtration effect | action and exhibits the outstanding effects, such as filtration efficiency increasing.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 show an example of a multiple disk dewatering apparatus in which the present invention is implemented, particularly a multiple disk dewatering apparatus in which the cake transport path 6 has a closed structure.

  First, the multiple disk dewatering device will be described.

  In FIGS. 1 to 4, the same components as those shown in FIG. 13 are denoted by the same reference numerals.

  An upper filter body group 4 and a lower filter body group 5 are provided in the dehydration tank 3 so as to face each other vertically, and a cake transport path 6 is formed between the upper filter body group 4 and the lower filter body group 5.

  The upper filter body group 4 and the lower filter body group 5 are configured such that a required number of filter bodies 7 are partially polymerized and connected in series. The structure of the filter body 7 is the same as that described in the conventional multiple disk dewatering device, and thus the description thereof is omitted.

  An upstream end filter body group 23 is provided at the upstream end of the cake transport path 6. The upstream end filter body group 23 is constituted by the filter body 7, similar to the upper filter body group 4 and the lower filter body group 5, and the filter body 7 located at the upper and lower ends of the upstream end filter body group 23. Are connected to the upper filter body group 4 and the lower filter body group 5 so as to partially overlap with the filter body 7 located at the upstream end.

  Accordingly, the cake transport path 6 is a space closed by both side walls of the dehydration tank 3, the upper filter body group 4, the lower filter body group 5, and the upstream end filter body group 23.

  The filter bodies 7 constituting the upper filter body group 4, the lower filter body group 5, and the upstream end filter body group 23 are respectively connected to a driving source (not shown), and the aggregation stock solution in the cake transport path 6, or It is rotated to give the flock a downstream force.

  The discharge port 10 opened at the downstream end of the cake transport path 6 is provided with a resistance plate 24 as discharge resistance applying means. The resistance plate 24 is rotatably supported at the upper end by the dehydration tank 3 and is suspended so as to close the discharge port 10 by its own weight. Further, a required number of weight plates 25 can be attached to and detached from the resistance plate 24, and the closing force of the discharge port 10 can be adjusted by the number of weight plates 25.

  The coagulation tank 12 having a sealed structure and the dehydration tank 3 are connected to each other by a coagulation stock solution supply pipe 26, and the coagulation stock solution supply pipe 26 opens at the upstream end of the cake conveyance path 6 on the side wall of the dehydration tank 3.

  A pressure gauge 29 is provided at an appropriate position such as the upstream end of the aggregation tank 12, the aggregation stock solution supply pipe 26, or the cake conveyance path 6 so that the pressure in the upstream portion of the cake conveyance path 6 is detected. It has become.

  The coagulation tank 12 is connected with a stock solution supply line 14 and a coagulation liquid supply line 15, and the stock solution or the coagulation liquid can be pumped to the coagulation tank 12 by a stock solution supply pump 16 and a coagulation solution supply pump 17, respectively. . The agglomeration tank 12 has a closed structure, but an accumulator (not shown) capable of absorbing pressure fluctuations in the cake conveyance path 6 may be connected to the agglomeration tank 12.

  The stock solution in the agglomeration tank 12 is agitated by the agitator 18, and the aggregating action by the agglomerated liquid is promoted.

  Next, the filter body 7 and the like will be described in detail with reference to FIGS.

  A lower part of the lower filter body group 5 of the dehydration tank 3 is a filtrate storage part 27, and a filtrate storage side chamber 28 is formed on both sides or one side of the dehydration tank 3. Is configured to store the filtrate dropped by the gravity dehydration unit and the filtrate separated by the pressure dehydration unit, and the upper filter body group 4 and the lower filter body are stored in the filtrate storage side chamber 28 as described later. The collected filtrate flows into the filtrate passage 11 formed in the group 5.

  3 and 4 show the filter body 7, and metal discs 31 such as stainless steel plates and spacers 32 made of metal or synthetic resin are alternately fitted to the shaft body 30, and the discs 31, The spacer 32 has a structure in which the spacers 32 are stacked in multiple layers. The outer diameter of the spacers 32 is smaller than the outer diameter of the disk 31, and the thickness of the spacers 32 is slightly larger than the thickness of the disks 31. Yes. In FIG. 3, for the sake of easy understanding, the thickness of the spacer 32 is shown large.

  A groove 33 is formed by the disk 31 and the spacer 32 on the outer peripheral portion of the filter body 7, and the disk 31 of the filter body 7 adjacent to the groove 33 is fitted into the filter body 7. And the adjacent filter body 7 are partially polymerized. An eye 38 through which the filtrate passes is formed between the tip of the disk 31 and the peripheral surface of the spacer 32.

  In the filter body 7, the filtrate passage 11 penetrating the disk 31 and the spacer 32 is formed at a position where the circumference is equally divided, for example, at a position where the circumference is equally divided in FIG. 4.

  Further, as shown in FIG. 5, for example, as shown in FIG. 5, a notch 40 is formed on the outer periphery of each of the spacers 32, and the filtrate passage 11 is opened by the notch 40. It has become.

  A side wall 34 adjacent to the filtrate storage side chamber 28 of the dehydration tank 3 is provided with a required number of filtrate inlets 35 on a circumference having the same diameter as the circumference where the filtrate passage 11 is provided. . The filtrate inlet 35 has the same diameter as the filtrate passage 11 or a larger diameter than the filtrate passage 11. Therefore, the filtrate passage 11 and the filtrate passage 11 are aligned with each other by rotating at a pitch angle at which the filtrate passage 11 is formed. In the illustrated example, the filtrate passage 11 and the filtrate inlet 35 coincide with each other when the filter body 7 rotates 45 °.

  A hole 39 is provided in at least one portion of the other side wall 36 of the dehydration tank 3, and a cleaning nozzle 37 is provided adjacent to the hole 39, and a jet water stream flows from the cleaning nozzle 37 toward the filtrate passage 11. It comes to be injected.

In addition, the jet direction of the jet water flow is inclined with respect to the axis of the filtrate passage 11, and the inclination angle θ is 0, where L is the total length of the filtrate passage 11 and D is the diameter of the filtrate passage 11. <Θ <α≈tan ⁻¹ (D / L). The angle of inclination does not have to be strict, and it is essential that the jet water flow penetrates or passes through the filtrate passage 11 and is inclined with respect to the axis of the filtrate passage 11.

  Hereinafter, the operation of the multiple disk dewatering device described above will be described.

  The stock solution supply pump 16 and the aggregate solution supply pump 17 are driven to pump the stock solution and aggregate solution into the aggregation tank 12. The stock solution and the flocculated liquid are stirred in the flocculation tank 12 to form a flocculated stock solution in which the solid content in the stock solution is flocculated, and is fed to the upstream portion of the cake transport path 6 through the flocculated stock solution supply pipe 26.

  Since the discharge port 10 is closed by the resistance plate 24, the discharge port 10 is not discharged in any state of the agglomerated stock solution or cake until the cake transport path 6 rises to a predetermined pressure.

  In the cake conveying path 6, the aggregated undiluted solution is separated into aggregated flocs and filtrate by the eyes 38, and the filtrate passes through the eyes 38 and falls into the filtrate storage unit 27, and also passes through the notch 40 and the filtrate. It flows into the passage 11, passes through the filtrate inlet 35, and flows out into the filtrate storage side chamber 28.

  By increasing the pressure inside the cake transport path 6, the filtrate separation action in the gravity dehydration unit is promoted, and the filtrate separation processing amount increases. Therefore, the moisture content of the cake transferred to the pressing and dehydrating portion is reduced, the cake pressing action in the pressing and dehydrating portion becomes effective, and the amount of dewatering treatment from the cake increases.

  The cake dehydrated in the gravity dewatering unit is squeezed in the squeezing and dewatering unit on the upstream side of the cake conveying path 6.

  The liquid contained in the cake is filtered and separated by pressing, and a part of the filtrate separated in the pressing and dewatering part leaks out to the filtrate passage 11 through the notch 40 of the spacer 32, and the filtrate. It passes through the passage 11 and flows into the filtrate storage side chamber 28 through the filtrate inlet 35.

  Further, when the cake conveying path 6 is pressurized, the filtrate may leak to the upper side of the upper filter body group 4 and accumulate on the upper filter body group 4 in some cases. In this case, the upper filter body group 4 is inclined so as to be inclined downward toward the filtrate storage side chamber 28, or the dehydration tank 3 itself is inclined so that the filtrate storage side chamber 28 side is downward. As the upper filter body group 4 is inclined, the filtrate accumulated on the upper filter body group 4 is dropped and discharged into the filtrate storage side chamber 28.

  In addition, a pressure in the discharge direction acts on the cake by pressurizing the inside of the cake transport path 6, and further, the moisture content of the cake decreases, so that the upper filter body group 4 and the lower filter body group 5 The conveying power of the cake increases. The conveyed cake pushes up the resistance plate 24 and is discharged from the discharge port 10. By adjusting the number of the weight plates 25, the closing force of the discharge port 10 by the resistance plate 24 can be adjusted, and the resistance at the time of discharging the cake can be changed, so that the moisture content of the cake can be adjusted. It becomes.

  Control of the pressure inside the cake transport path 6 is also performed by controlling the supply amounts of the stock solution supply pump 16 and the coagulated solution supply pump 17. The pressure gauge 29 detects the pressure of the cake transport path 6, and the detection result is fed back to the driving of the stock solution supply pump 16 and the coagulated liquid supply pump 17 so that the pressure of the cake transport path 6 becomes a predetermined pressure. In addition, the supply amount of the stock solution and the flocculated solution is controlled. For example, about 0.05 MPA is selected as the predetermined value of the pressure to be controlled.

  Thus, the aggregation stock solution is pumped so that the detected pressure becomes a predetermined value, and the filtration state can be adapted to the state of the aggregation stock solution, and the filtration efficiency can be maintained and improved.

  In the case where an accumulator is provided, the fluctuation in pressure is absorbed by the accumulator, so that the supply amount of the stock solution supply pump 16 and the aggregate solution supply pump 17 can be a fixed amount supply.

  By continuing filtration and dehydration of the aggregated stock solution, the aggregated floc adheres to the disk 31 and also adheres to the inner wall of the filtrate passage 11. Aggregated floc adhering to the disk 31 is scraped and removed by sliding between the polymerized disks 31 and 31.

  Further, the flocs flocs adhering to the inner wall of the filtrate passage 11 or the flocs clogging the filtrate passage 11 are removed by jetting a jet water flow from the washing nozzle 37 to the filtrate passage 11.

  As shown in FIGS. 6 (A), 6 (B), and 6 (C), the washing of the filtrate passage 11 is such that the jet direction of the jet water flow is inclined with respect to the axis of the filtrate passage 11. Therefore, when the filter body 7 rotates, the jet water flow first collides with the wall surface on the cleaning nozzle 37 side (front side) (see FIG. 6A), and then with the rotation of the filter body 7 The contact position gradually moves to the back (see FIG. 6B), and finally passes through the filtrate passage 11 (see FIG. 6C). Therefore, the penetration of the filtrate passage 11 and the cleaning of the wall surface of the filtrate passage 11 can be performed simultaneously by the jet water flow.

  Further, by providing a plurality of the washing nozzles 37 and changing the jet direction of the jet water flow from each washing nozzle 37, it becomes possible to wash different portions of the wall surface of the filtrate passage 11 for each washing nozzle 37. The entire 11 wall surfaces can be cleaned. Further, a jet water flow direction from the washing nozzle 37 may be combined in parallel with the axis of the filtrate passage 11.

  As described above, most of the filtrate is filtered and separated through the eye 38 (see FIG. 3). For example, the spacer 32 occupies most of the lower filter body group 5 facing the cake transport path 6. Also in the above-described embodiment, the notch 40 that communicates with the filtrate passage 11 is formed in the spacer 32, and the filtrate leaks to the filtrate passage 11 through the notch 40, but the notch 40 is only formed in a part of the pole, and is not sufficient for filtration. Further, the eyes formed by forming the cutout 40 correspond to the diameter of the filtrate passage 11 penetrating the spacer 32. In order to increase the amount of filtration by the spacer 32, if a large number of the cutout portions 40 are formed, leakage of the aggregated flocs increases and the filtration effect is reduced.

  Next, a second embodiment will be described with reference to FIGS.

  Here, FIG. 7 to FIG. 10 show a disc 47 with a spacer in which a disc 31 constituting the filter body 7 and a spacer 32 are integrated. The disc 47 is integrally formed of, for example, a synthetic resin. A fitting hole 48 through which the shaft body 30 (see FIG. 3) passes is formed at the center, and the periphery of the fitting hole 48 is thick. It is a boss portion 49. A passage hole 51 for forming the filtrate passage 11 is formed around the boss portion 49. Around the passage hole 51, wedge-shaped protrusions 52 are formed over the entire circumference at a required circumferential pitch. The thickness of the portion where the projection 52 is formed is the same as the thickness of the boss portion 49.

  Further, as seen in FIG. 9, a filtration groove 53 is formed between the protrusions 52, 52, and the filtration groove 53 has a tapered shape with a narrow outer peripheral side and a wide central side.

  When the disc 47 is incorporated in the shaft body 30 and the discs 47 and 47 are superposed, the protrusion 52 comes into contact with the adjacent disc 47 and the filtration groove 53 functions as a filtration hole extending in the radial direction. To do. Further, the protrusion 52 functions as the spacer 32 shown in FIGS. The formed filtration hole has an outer end that opens to the peripheral surface of the spacer 32 and an inner end that opens to the passage hole 51. Further, since the filtration groove 53 has a wide cross-sectional area on the center side, it can be easily removed even when agglomerated floc flows in, and the filtration hole 51 is prevented from being clogged. Further, the size of the opening opened to the outer periphery can be set to the same size as that of the eye 38 (see FIG. 3) by appropriately setting the interval between the passage holes 51.

  Projections 50 are provided on the outer periphery of the disc 47 at required intervals. The protrusion 50 scrapes off the agglomerated floc adhering to the portion of the disc 47 that contacts the eye 38.

  Further, as another method for forming the filtration hole, a combination of the disc 31 and a separately manufactured spacer may be used as in the prior art.

  11 and 12 show a spacer 54 that forms a filtration hole. The spacer 54 is formed by pressing a ring-shaped thin plate so that the cross section has a rectangular wave shape to form a filtration hole 55 extending in the radial direction.

  The filter body 7 is configured by fitting the spacer 54 into the disk 31 and fixing it with a necessary means such as caulking, and fitting a predetermined number of disks 47 integrated with the spacer 54 onto the shaft body 30. Is done.

  In the second embodiment, a filtration hole that opens over the entire circumference of the filter body 7 is formed, and the filtrate is guided to the filtrate passage 11 through the filtration hole. Since the filtration holes are formed over the entire circumference of the filter body 7, eyes for uniform filtration are formed in the entire lower filter body group 5, so that the filtration efficiency is greatly improved.

  In the second embodiment, a synthetic resin may be used for the disk 47. However, when a synthetic resin disk is used, gravity dehydration of the upper filter group 4 and the lower filter group 5 is performed. For example, a synthetic resin disc 47 may be used for the part, and a metal plate may be used for the pressing and dewatering part. In addition, a metal plate disk may be interposed and reinforced for each required number of sheets of synthetic resin. Alternatively, the outer peripheral portion of the disc 47 is made of a metal material such as stainless steel, the central portion is made of synthetic resin, and the outer peripheral portion and the central portion are press-fitted or integrally molded by molding or the like. May be reinforced.

  Although the above embodiment has been described with respect to the multiple disk dewatering device in which the cake conveyance path 6 is closed, it can be implemented in the multiple disk dewatering apparatus in which the cake conveyance path 6 shown in FIG. 13 is open. Needless to say.

It is a schematic explanatory drawing which shows the 1st Embodiment of this invention. It is an AA arrow line view of FIG. It is a partial top view of the lower filter body group in the 1st Embodiment of this invention. It is a BB arrow line view of FIG. It is a BB arrow line view equivalent view of FIG. 3, and shows the case where the notch part is notched in the spacer. (A), (B), (C) is explanatory drawing which shows the effect | action of the 1st Embodiment of this invention. It is a front view of the disc used for the 2nd Embodiment of this invention. It is a side view of the disc used for the 2nd Embodiment of this invention. It is the C section enlarged view of FIG. It is the D section enlarged view of FIG. It is the spacer partial front view which shows the other example of the disc used for the 2nd Embodiment of this invention, and comprises a disc. It is a spacer partial top view which comprises the disc of this invention. It is a schematic perspective view which shows the conventional multiple disc dehydrator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Dehydration tank 4 Upper filter body group 5 Lower filter body group 6 Cake conveyance path 7 Filter body 8 Rotating shaft 10 Discharge port 11 Filtrate passage 13 Aggregation stock solution supply port 14 Stock solution supply line 15 Condensate supply line 16 Stock solution supply pump 17 Aggregation solution Supply pump 23 Upper end filter body group 24 Resistance plate 30 Shaft body 31 Disc 32 Spacer 33 Groove 37 Cleaning nozzle 38 eyes

Claims (3)

  A filter body constituted by alternately and repeatedly fitting a disc and a spacer having a smaller diameter than the disc on a rotatable shaft body is provided in a required number so that a part of the disc is superposed. In the multiple disk dewatering device comprising a filter body group that is filtered from the gap between the polymerized portions, a filtrate passage penetrating the disk and the spacer is formed, and the filtrate leaked into the filtrate passage is passed through the filtrate passage. A washing nozzle is provided for discharging the jet water flow toward the filtrate passage so as to be discharged from the shaft end of the filter body. The jet water flow can pass through the filtrate passage and the injection direction is at the axis of the filtrate passage. A multi-disk dewatering device characterized by being inclined with respect to the same.   The multiple disk dewatering device according to claim 1, wherein a plurality of the cleaning nozzles are provided so that the inclination of the jet direction of the jet water flow is different.   The multiple circle according to claim 1, wherein a groove extending in the radial direction in the spacer and having one end opened in the passage hole and the other end opened in the circumferential surface of the spacer is formed, and the filtrate leaks into the passage hole through the groove. Board dewatering device.

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