JP4591232B2 - 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 shown in Patent Document 1 or Patent Document 2. 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. Further, the filter body 7 is formed with a filtrate passage 11 penetrating the disk 9 and the spacer in the axial direction, and the filtrate is discharged from the side wall of the dehydration tank 3 through the filtrate passage 11. Yes.

  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 upper end opening portion of the cake transport path 6.

  The flocculated stock solution 19 supplied to the cake transport path 6 is separated by filtration in the upstream portion of the cake transport path 6 by gravity, and the flocculation flocs are the upper filter body group 4 and the lower filter body group 5. Therefore, it is conveyed downstream. In addition, the flocs are 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 and falls through the eyes between the discs 9 and 9. 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 downward through the lower filter body group 5, and the remainder flows out from the side wall of the dehydration tank 3 through the filtrate passage 11.

  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, 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 adjacent filter bodies 7 and 7 are polymerized, and the filtration area formed in the lower filter body group 5 is small and effective filtration action. Is difficult to obtain. 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.

JP 2004-330060 A

JP 2005-7327 A

  In view of such circumstances, the present invention increases the filtration action in the gravity dehydration section, promotes the dehydration action in the press dehydration section to increase the processing amount, and further reduces the moisture content of the discharged cake to the state of the stock solution. Regardless of the above, it is possible to control to a predetermined value.

  According to the present invention, a required number of filter bodies constituted by a plurality of discs fitted on a rotatable shaft body are continuously arranged so that a part of the discs are superposed, and filtration is performed from a gap between the discs of the filter bodies. In the multiple disk dewatering device having the filter body group configured as described above, the cake transport path formed by the filter body group is used as a closed space, and the agglomerated stock solution in which solids are aggregated is pumped into the cake transport path. The present invention relates to a multiple disk dewatering device configured in the same manner.

  Further, the present invention provides a multiple circle in which the filter body groups are arranged opposite to each other, the cake transport path is formed between the filter body groups, and the upstream end of the cake transport path is closed by the filter body. It relates to a plate dewatering device, and the filter body group is disposed in the dewatering tank so as to face each other, the cake transport path is formed between the filter body groups, and the upstream end of the cake transport path is located in the dewatering tank. The cake conveying path is connected to the opening of the upstream wall, the downstream end of the cake conveying path is related to a multiple disk dewatering device that communicates with the opening of the downstream wall of the dewatering tank, and the cake conveying path is connected to a ceiling plate provided on the upper part. Formed between the filter body group provided in the lower part, the upstream end of the cake transport path communicates with the opening of the upstream wall of the dewatering tank, and the downstream end of the cake transport path is the downstream wall of the dewatering tank. The present invention relates to a multiple disk dewatering device communicating with an opening.

  The present invention also relates to a multiple disk dewatering device in which a discharge resistance applying means is provided at the downstream end opening of the cake conveying path.

  Furthermore, the present invention includes a sealed flocculation tank for storing the flocculated stock solution to be pumped, and a pressure gauge is provided for detecting the pressure at a required position of the stock solution supply path including the cake transport path from the flocculation tank. The present invention relates to a multiple disk dewatering device in which the aggregated stock solution is pumped so that the pressure becomes a predetermined value.

  According to the present invention, a required number of filter bodies constituted by a plurality of discs fitted on a rotatable shaft body are continuously arranged so that a part of the discs overlap, and a gap between the discs of the filter bodies is provided. In a multiple disk dewatering device having a filter body group that is filtered from a cake transport path formed by the filter body group as a closed space, and a coagulated stock solution in which solids aggregate in the cake transport path Since it is configured to be pumped, the inside of the cake transport path is in a pressurized state, water drainage from the stock solution increases, the moisture content of the cake when pressed and dehydrated in the filter body group decreases, and the pressing effect is It increases and the conveyance efficiency of a cake improves.

  Further, according to the present invention, since the discharge resistance applying means is provided at the downstream end opening of the cake transport path, the moisture content of the discharged cake can be controlled.

  Further, according to the present invention, a sealed agglomeration tank for storing the agglomerated stock solution to be pumped is provided, and a pressure gauge for detecting a required pressure of the stock solution supply path including the cake transport path is provided from the agglomeration tank, and a detected pressure is provided. Since the agglomerated stock solution is pumped so that the value becomes a predetermined value, the filtration state can be matched with the state of the agglomerated stock solution, and excellent effects such as maintaining and improving the filtration efficiency can be exhibited.

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

  A first embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1 to FIG. 4, the same reference numerals are given to the same components as those shown in FIG.

  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. In addition, about the structure of this filter body 7, since it is the same as that of having demonstrated in the prior art example, description is abbreviate | 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, similarly to the upper filter body group 4 and the lower filter body group 5, and the filter bodies 7 located at both ends of the upstream end filter body group 23 are The upper filter body group 4 and the lower filter body group 5 are connected in series so as to partially overlap with the filter body 7 located at the upstream end of the lower filter body group 5.

  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 upper 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. . Although the agglomeration tank 12 has a closed structure, an accumulator capable of absorbing pressure fluctuations in the cake transport 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 specifically described 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 that has fallen due to gravity dehydration and the filtrate separated by the pressure dehydration unit, and the filtrate storage side chamber 28 stores the upper filter group 4 and the lower filter group as will be described later. The filtrate collected in the filtrate passage 11 formed in 5 flows in.

  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. The outer diameter of the spacer 32 is smaller than the outer diameter of the disc 31, and the thickness of the spacer 32 is slightly larger than the thickness of the disc 31. . In FIG. 3, for the sake of easy understanding, the thickness of the spacer 32 is shown large.

  A groove 33 is formed on the outer periphery of the filter body 7 by the disk 31 and the spacer 32, and the disk 31 of the filter body 7 adjacent to the groove 33 is fitted into the filter body 7. The adjacent filter body 7 is 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. A part of the spacer 32, for example, every five spacers 32, is cut off at the outer periphery, and the filtrate passage 11 is open.

  A filtrate inlet 35 is bored in the side wall 34 adjacent to the filtrate storage side chamber 28 of the dehydration tank 3 so as to match the filtrate passage 11. A cleaning nozzle 37 is provided on the other side wall 36 of the dehydration tank 3, and a jet water flow is jetted from the cleaning nozzle 37 toward the filtrate passage 11.

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 when the total length of the filtrate passage 11 is L and the diameter of the filtrate passage 11 is D. <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 the filtrate passage 11 and is inclined 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 agglomerated stock solution or cake until the cake transport path 6 rises to a predetermined pressure.

  By increasing the pressure inside the cake conveyance path 6, the filtrate separation action in the gravity dehydration unit is promoted, and the filtrate separation processing amount is increased. 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.

  A part of the filtrate separated in the pressure dewatering section leaks into the filtrate passage 11 through the notched portion of the spacer 32, passes through the filtrate passage 11, and passes through the filtrate inlet 35 to the filtrate storage side chamber 28. Flow into.

  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 incline 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. Thus, the filtrate collected on the upper filter 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 the 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 removed by sliding between the polymerized disks 31 and 31.

  The aggregation flocs adhering to the inner wall of the filtrate passage 11 or the aggregation floc clogging the filtrate passage 11 is removed by jetting a jet water flow from the washing nozzle 37 to the filtrate passage 11. . In the washing of the filtrate passage 11, since the jet direction of the jet water flow is inclined with respect to the axis of the filtrate passage 11, when the filter body 7 is rotated, the jet water flow is first brought into the washing nozzle 37 side (front side). ), The contact position gradually moves to the back as the filter body 7 rotates, and finally passes through the filtrate passage 11. 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.

  FIG. 5 shows a modification of the discharge resistance applying means.

  In FIG. 5A, the resistance plate 24 is moved up and down by the open / close cylinder 39, and the opening ratio of the discharge port 10 is changed to control the discharge resistance, that is, the moisture content of the cake. .

  In FIG. 5B, a pair of rollers 41a and 41b facing the discharge port 10 is provided, and the rotational speed of the rollers 41a and 41b is controlled, so that the cake discharge speed, that is, the discharge resistance applied to the cake. Is controlling.

  In FIG. 5C, a pair of rollers 41 a and 41 b facing the discharge port 10 is provided, the rotational speed of the rollers 41 a and 41 b is controlled, and one of the rollers can be moved closer to and away from the cylinder 42. The opening area of the discharge port 10 can be adjusted.

  FIG. 6 shows a second embodiment. In the second embodiment, the upper filter body 4 and the lower filter group 5 both have upstream filter bodies 7 a and 7 b on the upstream wall of the dehydration tank 3. The aggregation stock solution supply port 13 is provided in the upstream wall of the dehydration tank 3, and the aggregation stock solution supply port 13 communicates with the upstream end of the cake transport path 6. Although not particularly illustrated, the aggregated stock solution supply pipe 26 is liquid-tightly connected to the aggregated stock solution supply port 13. The aggregation stock solution supply unit is the same as that in the first embodiment, and a description thereof will be omitted.

  The aggregation stock solution supply port 13 and the upstream end of the stock solution supply pump 16 are connected by a chute 43. The chute 43 includes a chute upper plate 43a and a chute lower plate 43b. The chute upper plate 43a contacts the lower side of the filter body 7a at the upstream end of the upper filter body group 4, and the chute lower plate 43b. Are in contact with the upper side of the filter body 7b at the upstream end of the lower filter body group 5, and when the cake transport path 6 is pressurized, the chute 43, the upper filter body group 4, the lower filter body group The sealing property of 5 is increased.

  Further, the tip portion where the upper chute plate 43a abuts against the filter body 7a and the tip portion where the chute lower plate 43b abuts against the filter body 7b each have a comb-teeth shape so that watertightness is maintained. ing.

  7 and 8 show a contact portion between the lower chute plate 43b and the filter body 7b of the lower filter body group 5. FIG. Comb teeth 44 are formed on the lower surface of the tip of the chute lower plate 43b, and the comb teeth 44 are fitted into the grooves 33 between the discs 31 and 31. When the comb teeth 44 are fitted into the grooves 33, there is no gap between the chute 43 and the upper filter body group 4 and the lower filter body group 5, thereby improving water tightness and coagulating through the grooves 33. The floc is prevented from leaking.

  The surface of the comb teeth 44 that faces the spacer 32 may be formed on a cylindrical surface along the peripheral surface of the spacer 32.

  A contact portion between the filter body 7a and the chute upper plate 43a has the same configuration.

  FIG. 9 shows a third embodiment.

  In the third embodiment, the upper filter body group 4 is omitted, and a ceiling plate 46 is provided so as to face the lower filter body group 5. In the third embodiment, the filter body 7 b at the upstream end of the lower filter body group 5 is provided so as to contact the upstream wall surface of the dewatering tank 3. Accordingly, comb teeth 44 (not shown) are provided on the upstream wall surface of the dewatering tank 3 to fit into the grooves 33 of the filter body 7b.

  By providing the comb teeth 44 on the upstream wall surface of the dewatering tank 3, the sealing performance between the filter body 7b and the upstream wall surface is improved, and the aggregation floc is prevented from leaking.

  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 group 5 facing the cake transport path 6. Also in the above-described embodiment, the notch portion communicating with the filtrate passage 11 is formed in the spacer 32, and the filtrate leaks into the filtrate passage 11 through the notch portion. In addition, it is not sufficient for filtration, and the eyes formed by further forming the notches become long enough to correspond to the diameter of the filtrate passage 11 penetrating the spacer 32, and many When the slag is formed, leakage of the aggregated floc increases, resulting in a problem that the filtration effect is reduced.

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

  Here, FIGS. 10 to 13 show a disk 47 in which the disk 31 and the spacer 32 constituting the filter body 7 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.

  Further, as seen in FIG. 12, a filtration groove 53 is formed between the protrusions 52 and 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 assembled in the shaft body 30 and the discs 47 and 47 are superposed, the filtration groove 53 comes into contact with the adjacent disc 47 to form a filtration hole. Since the formed filtration hole has a wide cross-sectional area on the center side, it can be easily removed even when agglomerated floc flows, and the filtration hole 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 filtration grooves 53.

  On the outer periphery of the disc 47, convex portions 50 are projected at a required interval. The convex portion 50 scrapes off the aggregated floc adhering to the portion of the disc 47 that is adjacent to the eye 38.

  Further, as another method of forming the filtration hole, a combination of the disk 31 and the spacer 32 may be used as in the prior art.

  14 and 15 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 spacer 54 is fitted into the disk 31 and fixed by necessary means such as caulking, and a predetermined number of the disks 31 are fitted into the shaft body 30 to form the filter body 7.

  In the fourth 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 fourth embodiment, a synthetic resin may be used for the disk 47. However, when a synthetic resin disk is used, the gravity dehydration unit of the upper filter group 4 and the lower filter group 5 is used. For example, a disc 47 made of synthetic resin may be used, 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.

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 1st Embodiment of this invention. It is a BB arrow line view of FIG. (A), (B), and (C) are partial schematic views showing modified examples of the discharge resistance applying means. It is a schematic explanatory drawing which shows the 2nd Embodiment of this invention. It is a partial front view which shows the relationship between the chute | shoot and a filter body in this 2nd Embodiment. It is a partial side view which shows the relationship between the chute | shoot and a filter body in this 2nd Embodiment. It is a schematic explanatory drawing which shows the 3rd Embodiment of this invention. It is a front view of the disc used for the 4th Embodiment of this invention. It is a side view of the disc used for the 4th Embodiment of this invention. It is the C section enlarged view of FIG. It is the D section enlarged view of FIG. It is a spacer partial front view which comprises the disc used for the 4th Embodiment of this invention. It is a spacer partial top view which comprises the disc used for the 4th Embodiment 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 Aggregate 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 Eye 43 Chute 44 Comb teeth 46 Ceiling plate

Claims (3)

  A required number of filter bodies constituted by a plurality of discs fitted on a rotatable shaft body are arranged so that a part of the discs are superposed, and filtration is performed from the gap between the discs of the filter bodies. A filter body group is arranged vertically opposite to each other, a cake transport path of a closed space is formed between the filter body groups, an upstream end of the cake transport path is closed by the filter body, and solid content is contained in the cake transport path. A multi-disc dewatering device characterized by being configured to pump agglomerated stock solution. The multiple disk dewatering device according to claim 1, wherein discharge resistance applying means is provided at an opening at a downstream end of the cake conveyance path.   A sealed agglomeration tank for storing the agglomerated stock solution to be pumped is provided, and a pressure gauge is provided for detecting the pressure at a required position of the stock solution supply path including the cake transport path from the agglomeration tank, and the detected pressure becomes a predetermined value. The multiple disk dewatering device according to claim 1, wherein the agglomerated stock solution is pumped in the same manner.

Images