JP2008221044A - Rotary pressure dehydrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary pressure dehydrator allowing stable dehydration of sludge, easy discharge of dehydrated cake, and preferable dehydration of sludge. <P>SOLUTION: A dehydrated cake discharge part 9 of the rotary pressure dehydrator 1 is provided at a place discharging the dehydrated cake in a dehydration chamber 10 from an upper side of a rotary center O of a disk-like filter plate, and from the outer peripheral part of the dehydration chamber 10. A sludge supply part 8 is provided at a lower side from the dehydrated cake discharge part 9, and at a place supplying sludge into the dehydration chamber 10 from the outer peripheral part of the dehydration chamber 10. An upward guide face 5c gradually rising from the outer peripheral face of the upper side of an inner ring spacer 3 toward an upper face 5b side, is formed between the upper face 5b of the dehydrated cake discharge part 9 of a partitioning spacer 5 and the upper outer peripheral face of the inner ring spacer 3 rotated by a drive shaft 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention supplies sludge such as industrial wastewater sludge and sewage sludge into a dehydration chamber equipped with a disk-shaped filter plate having a filtration surface provided with a large number of water permeation holes on at least one side in the width direction. In addition, the present invention relates to a rotary pressure dehydrator that filters and concentrates and dehydrates the filtrate with a filter plate while rotating the sludge following the rotation of the disk-shaped filter plate.

  A rotary pressure dehydrator for concentrating and dewatering sludge such as industrial wastewater sludge and sewage sludge is configured as described below. That is, a pair of disc-shaped filter plates having a filtration surface that is rotated by an inner ring spacer by a horizontal drive shaft driven by an electric motor with a speed reducer and provided with a large number of water permeable holes are provided. In addition, a dehydration chamber is formed between the pair of filter plates and an outer ring spacer with which the outer edges of the pair of filter plates are in sliding contact. The dewatering chamber is provided with a sludge supply section for supplying sludge conditioned by the addition and mixing of the polymer flocculant, and a dewatered cake discharge section for discharging the dehydrated cake from the dewatering chamber. ing.

The sludge supply part of the rotary pressure dehydrator according to the conventional example is a position above the rotation center of the disc-shaped filter plate and supplying sludge from the outer peripheral part of the dehydration treatment chamber into the dehydration treatment chamber. Is provided. The dewatering cake discharge portion is provided at a position on the lower side of the rotation center of the disk-shaped filter plate and discharging the dewatering cake in the dewatering chamber from the outer periphery of the dewatering chamber. A horizontal guide surface having the same height as the outer peripheral surface on the lower side of the inner ring spacer rotated by the drive shaft is formed on the lower surface of the dewatering cake discharging portion side of the partition spacer that partitions the sludge supply portion and the dewatering cake discharging portion. (For example, see Patent Documents 1 and 2 and Non-Patent Document 1).
JP-T-2004-532733 Japanese Patent Laid-Open No. 2004-90048 Rotary pressurization dehydrator, Japan Sewerage New Technology Promotion Organization, March 2002, p. 12-35

Since the rotary pressure dehydrator according to the above conventional example has the following excellent characteristics, it has been gradually adopted in sludge treatment facilities such as industrial wastewater sludge and sewage sludge. Yes.
(1) No special process is required for starting and stopping, and the structure is simple.
(2) Dehydration performance is superior to existing polymer dehydrators.
(3) Since a plurality of rotary pressurization dehydrators can be easily arranged side by side, it is possible to easily cope with a wide range of processing amounts.
(4) Lighter and more compact than other types of polymer dehydrators.
(5) Because of the sealed structure, odor countermeasures are easy.
(6) Since the rotational speed is extremely low (0.5 to 1.3 rpm), the required power is small.
(7) Since the surface area of the filter plate is small, the amount of washing water is small.
(8) Since the rotation is low speed and there are few rotating parts, there are few lubrication / greasing points, so maintenance is easy.
(9) Since the cleaning time of the filter plate is short, cleaning during operation is possible, the filter plate can be started up in a short time, and the dead time is small, the operation rate is high compared to other types of dehydrators.

  Since the rotary pressure dehydrator according to the conventional example has the advantages as described above, it is considered to be extremely excellent. By the way, the rotary pressure dehydrator according to this conventional example, as described above, the sludge supplied into the dehydration chamber from the upper side of the rotation center of the filter plate is filtered, squeezed and dehydrated as a dehydrated cake, and the filter plate It is the structure discharged | emitted from the discharge port of the dewatering cake discharge | emission part below the rotation center. Therefore, non-dehydrated sludge may flow down to the lower side of the dehydration treatment chamber, and dehydrated cake with a low dehydration rate may be discharged from the discharge port of the dehydrated cake discharge section on the lower side. That is, there is a problem that the dewatering of sludge may become unstable. If a dewatered cake with a low dewatering rate is discharged in this way, there will be an extreme increase in subsequent hopper storage, and in the case of a conveyor, sludge leakage will occur, making it impossible to restore unattended. Is not preferable.

Moreover, in the rotary pressure dehydrator according to the conventional example, the dehydrated cake is discharged from the discharge port of the dehydrated cake discharge unit below the rotation center of the filter plate, but the discharge port of the dehydrated cake discharge unit that acts on the dehydrated cake Since the pushing force toward the bottom is small, it becomes difficult for the dehydrated cake to be discharged and clogging occurs. Therefore, it is preferable that the pushing force toward the discharge port of the dewatered cake discharge portion acting on the dewatered cake is as large as possible. Incidentally, it can be understood that the pushing force toward the discharge port of the dewatered cake discharger acting on the dewatered cake is reduced due to the following reason. That is, as shown in FIG. 6 of the explanatory diagram of horizontal component force acting on the dewatered cake (propulsive force in the discharging direction of the dewatered cake), it adheres to a position away from the rotation center O of the filter plate, for example, by a radius r. An angle formed between a horizontal line passing through the rotation center O and a line connecting the rotation center O and the pressing position P, with the dewatering cake pressed against the pressing position P on the upper surface of the partitioning spacer on the side of the dewatering cake discharge portion Is θ ₁ . Then, the horizontal force component Fx ₁ acting on the dewatered cake is a Fsinshita _1, because a large no horizontal force Fx ₁ is obtained for the angle theta ₁ is less.

  Furthermore, the sludge conditioned by the addition / mixing of the polymer flocculant is supplied from the sludge inlet of the sludge supply unit into the dehydration chamber equipped with a filter plate, but most of the sludge supplied into the dehydration chamber is supplied. Is moisture (for example, moisture is about 97%). Therefore, since a large amount of water is filtered in the vicinity of the sludge inlet in the dehydration chamber, in order to efficiently dewater the sludge, it is necessary to secure a wider filtration area near the sludge inlet in the dehydration chamber. preferable.

  Accordingly, an object of the present invention is to provide a rotary pressure dehydrator that makes it possible to stably dewater sludge, makes it easy to discharge a dewatered cake, and can dewater sludge well. is there.

As a result of diligent research by changing the idea, the inventors have found that the sludge in the dehydration chamber can be moved from the lower side to the upper side even if the filter plate is rotated in the reverse direction, and the following: In view of this, the present invention has been realized.
(1) In order to increase the horizontal component force acting on the dewatered cake, that is, the driving force toward the discharge port of the dewatered cake discharge section, as well understood from FIG. 6, the horizontal line passing through the rotation center and the rotation center And the line connecting the pressing positions on the upper surface of the dehydrated cake discharge part of the dehydrated cake, that is, between the upper surface of the partition spacer where the dehydrated cake is pressed and the horizontal line passing through the center of rotation of the filter plate What is necessary is just to enlarge the space | interval.
(2) If the lower surface of the partition spacer is moved in the direction of the upper surface by an amount corresponding to the movement of the upper surface, the partition spacer can be moved closer to the sludge inlet in the dehydration chamber without damaging the strength of the partition spacer. A wide filtration area can be secured.

  In order to solve the above-mentioned problem, the gist of the means adopted by the rotary pressure dehydrator according to claim 1 of the present invention is that it is rotated by a horizontal drive shaft and has a plurality of water-permeable holes at least on one side in the width direction. In a rotary pressure dehydrator in which a sludge supply unit that supplies sludge into a dehydration treatment chamber equipped with a disk-shaped filter plate provided with a dehydrated cake discharge unit that discharges dehydrated cake is partitioned by a partition spacer, The dewatering cake discharge unit is provided at a position on the upper side of the rotation center of the disk-shaped filter plate, and the sludge supply unit is configured to discharge the dewatering cake in the dewatering chamber from the outer periphery of the dehydration chamber. The lower side of the dehydrated cake discharge part and provided at a position for supplying sludge from the outer periphery of the dehydration process chamber into the dehydration process chamber, and the upper surface of the partition spacer on the dehydrated cake discharge part side; Between the upper outer peripheral surface of the inner ring spacer rotated by the drive shaft, an upward guide surface that gradually increases from the upper outer peripheral surface of the inner ring spacer toward the upper surface side is formed. It is a feature.

  The gist of the means adopted by the rotary pressure dehydrator according to claim 2 of the present invention is the rotary pressure dehydrator according to claim 1, wherein the upward guide surface of the partition spacer is a curved surface with a gradually changing gradient. It is characterized by being.

  The gist of the means adopted by the rotary pressure dehydrator according to claim 3 of the present invention is the rotary pressure dehydrator according to claim 1, wherein the upward guide surface of the partition spacer is an inclined surface. It is what.

  The gist of the means adopted by the rotary pressure dehydrator according to claim 4 of the present invention is the rotary pressure dehydrator according to any one of claims 1 to 3, wherein the sludge of the sludge supply unit is The upper end of the inflow port is set to be a high position moved to the upper surface side from the horizontal line passing through the rotation center of the disk-shaped filter plate according to the position of the upper surface of the partition spacer on the dehydrated cake discharge portion side. It is characterized by being made.

  In the rotary pressure dehydrator according to the first to third aspects of the present invention, the dewatering cake discharge unit is configured to dispose the dewatering cake in the dewatering processing chamber above the rotation center of the disk-shaped filter plate, and in the dewatering processing chamber. The sludge supply part is provided at a position for discharging from the outer peripheral part, and the sludge supply part is provided at a position lower than the dewatered cake discharge part and at a position for supplying sludge from the outer peripheral part of the dehydration treatment chamber into the dehydration treatment chamber. The sludge supplied from the supply unit can be dehydrated by moving from the lower side to the upper side of the dehydration chamber. That is, according to the rotary pressure dehydrator according to the first to third aspects of the present invention, the non-dehydrated sludge has a high fluidity and therefore does not move to the upper side of the dehydration treatment chamber, but on the lower side of the dehydration treatment chamber. Since it moves to the upper side of the dehydration chamber only after it is reliably filtered and loses its fluidity, it is low from the discharge port of the dewatered cake discharge section as in the conventional sludge dehydration method using a rotary pressure dehydrator. The sludge is stably dewatered without the dewatering cake having a dewatering rate being discharged.

  In the rotary pressure dehydrator according to claims 1 to 3 of the present invention, the space between the upper surface of the partition spacer on the dehydrated cake discharge portion side and the upper outer peripheral surface of the inner ring spacer rotated by the drive shaft. Further, an upward guide surface that gradually increases from the outer peripheral surface on the upper side of the inner ring spacer toward the upper surface side is formed, and the upper surface on the side of the dehydrated cake discharge portion of the partition spacer and the rotation center of the filter plate The distance between the horizontal line passing through and increases. Therefore, the angle formed by the horizontal line passing through the rotation center and the line connecting the rotation center and the pressing position on the upper surface of the dehydrated cake on the dehydrated cake discharge portion side can be increased. Therefore, according to the rotary pressure dehydrator according to claims 1 to 3 of the present invention, the horizontal component force acting on the dewatered cake, that is, the propulsive force toward the discharge port side of the dewatered cake discharge portion is increased. Is easily discharged. Moreover, since the sludge flow path of the pressing dewatering zone on the upper side of the dewatering treatment chamber is gradually narrowed toward the dewatered cake discharge section, the sludge is compacted and dehydrated well.

  Further, according to the rotary pressure dehydrator according to claims 1 to 3 of the present invention, the dewatered cake is an upward guide surface that is continuous with the upper surface of the partition spacer on the dehydrated cake discharge portion side (the curved surface in claim 2, the claim). 3 is inclined to the inclined surface). However, the moisture content of the dehydrated cake is higher than the moisture content of the dehydrated cake that is pressed on the upper surface side, and the fluidity is high. Therefore, the movement of the part on the partition spacer side of the dehydrated cake to the dehydrated cake discharge part side is not hindered.

  In the rotary pressurization dehydrator according to claim 4 of the present invention, the upper end of the sludge inlet of the sludge supply section rotates the disk-shaped filter plate according to the position of the upper surface of the partition spacer on the dehydrated cake discharge section side. It is set to be a high position that has moved to the upper surface side from the horizontal line passing through the center. Therefore, according to the rotary pressure dehydrator according to claim 4 of the present invention, the separation filtration area according to the amount of movement of the partition spacer to the upper surface side on the dewatered cake discharge portion side without impairing the strength of the partition spacer. Therefore, a wider filtration area can be secured in the vicinity of the sludge inlet in the dehydration chamber, and sludge can be dehydrated satisfactorily.

  Hereinafter, a rotary pressurizing dehydrator according to Embodiment 1 of the present invention will be described with reference to the attached drawings. 1 is a partially omitted side view showing a schematic configuration of a rotary pressure dehydrator according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is an embodiment of the present invention. 4 is a plan view showing a schematic configuration of an outer ring spacer of a rotary pressurizing dehydrator according to FIG. 1, and FIG. 4 is an explanatory diagram of pushing force acting on a dewatering cake according to Embodiment 1 of the present invention.

  Reference numeral 1 shown in FIG. 1 is a rotary pressure dehydrator according to Embodiment 1 of the present invention. The basic configuration of the rotary pressure dehydrator 1 is the same as that according to the conventional example. That is, the rotary pressure dehydrator 1 includes a drive shaft 2 that is rotated at a rotation speed of 0.5 to 1.3 rpm by a drive device with a speed reducer (not shown). The drive shaft 2 is fitted with an inner ring spacer 3 that is rotated by the rotation of the drive shaft 2 through a key 2 a and an outer ring spacer 4 that surrounds the inner ring spacer 3. The inner ring spacer 3 is provided concentrically with the boss portion 3a, and is configured to rotate via the boss portion 3a.

The outer ring spacer 4 is provided with a partition spacer 5 having a concave curved surface in sliding contact with the outer peripheral surface of the inner ring spacer 3, which will be described later, on the center side of the outer ring spacer 4.
And the sludge inflow port 10a which becomes the structure mentioned later which opens in the horizontal direction is formed under this partition spacer 5. As shown in FIG. In addition, a dehydrated cake discharge portion 9 that opens in the horizontal direction is provided above the partition spacer 5. Further, the side wall of the partition spacer 5 includes a laterally long groove and a plurality of water outlets opened at the bottom of the groove, and discharges washing water for washing first and second filter plates described later. A washing water discharge part 5a is provided.

  An upper side of the inner ring spacer 3 is disposed between a horizontal upper surface 5b formed on the dehydrated cake discharge portion 9 side of the partition spacer 5 and an outer peripheral surface of the upper side of the inner ring spacer 3 rotated by the drive shaft 2. An upward guide surface 5c that gradually increases from the outer peripheral surface toward the upper surface 5b is formed. The upward guide surface 5c is an upwardly convex curved surface (for example, an arcuate curved surface, an elliptical arc curved surface, a hyperbolic curved surface, etc.) whose gradient gradually changes. The upper end 10 'of the sludge inlet 10a moves to the upper surface 5b side according to the position of the upper surface 5b of the partition spacer 5 on the dehydrated cake discharge portion 9 side, more specifically, the drive. It is set to be higher than the rotation center of the shaft 2.

  A disc-shaped first filter plate 6 provided with a large number of water permeable holes 6a is provided on the tip end side of the drive shaft 2 of the boss portion 3a protruding from both side surfaces of the inner ring spacer 3. Further, a disc-shaped second filter plate 7 having the same configuration as the first filter plate 6 and provided with a large number of water permeation holes 7a is provided on the proximal end side of the drive shaft 2. By the way, as the first filtration plate 6 and the second filtration plate 7 of the rotary pressurization dehydrator 1 according to the present embodiment, punching metal having a water permeation hole having a diameter of 0.5 mm was used. However, not limited to this, in the rotary pressure dehydrator, the diameter of the water permeation hole of the filter plate is 0.3 to 1.0 mm from the viewpoint of suppressing clogging of sludge into the water permeation hole of the filter plate. It is preferable to set in the range.

  That is, the first filter plate 6 and the second filter plate 7 are attached to the drive shaft 2 by fitting a fitting hole provided at the center of rotation. The fitting hole sides of the first filter plate 6 and the second filter plate 7 are fixed by means (not shown), and the opposing surfaces of the first and second filter plates 6 and 7 are moved by the mechanical fastening means (not shown). The inner ring spacer 3 is fixed in close contact with the side surface. The opposing surfaces in the vicinity of the outer periphery of the first and second filter plates 6 and 7 are configured to be in sliding contact with the surface in the vicinity of the inner peripheral portion of the outer ring spacer 4.

  Between the outer peripheral surface of the inner ring spacer 3, the inner peripheral surface of the outer ring spacer 4, the first filter plate 6, and the second filter plate 7, the sludge inlet 10 a to the dehydrated cake discharge unit 9 side. The dehydration treatment chamber is divided into a filtration zone 10b for filtering conditioned sludge flowing in from the sludge inflow portion 10a and a squeezing dehydration zone 10c for squeezing and dewatering sludge from which filtered water has been removed. 10 is formed. The sludge inlet 10a is attached with a sludge inlet 8a that opens downward, and a sludge supply unit 8 that supplies the sludge to the sludge inlet 10a via a sludge channel. In addition, what is in the dehydration processing chamber 10 and is in contact with each of the surfaces on the opposite sides of the first filter plate 6 and the second filter plate 7 is the first filter plate 6 and the second filter plate. This is a scraper 10 d that scrapes the cake adhering to each surface of the plate 7.

  A first cover 11 is disposed outside the first filter plate 6, and a flange portion of the first cover 11 is fixed to a side surface of the outer ring spacer 4. A second cover 12 is disposed outside the second filter plate 6, and a flange portion of the second cover 12 is fixed to a side surface of the outer ring spacer 4. A drain pipe 13 projecting downward is provided at the lower part of each of the first cover 11 and the second cover 12, and is supplied into the dehydration treatment chamber 10 through the sludge supply section 8 and the sludge inlet section 8a. The water in the sludge discharged into the first cover 11 and the second cover 12 through the numerous water-permeable holes 6a and 7a provided in the first and second filter plates 6 and 7 The drain pipe 13 is drained out of the machine.

  The sludge supply unit 8 is formed in a shape that does not prevent the dehydrated cake discharged from the discharge port 9a of the dehydrated cake discharge unit 9 from dropping downward. More specifically, as is well understood from FIGS. 1 and 3, the protruding size of the sludge supply unit 8 in the left direction in the drawing is in the left direction in the drawing of the discharge port 9 a of the dewatered cake discharge unit 9. It is set to be smaller than the projecting dimension. Therefore, one end of a dehydrated cake transport conveyor (not shown) that conveys the dehydrated cake discharged from the discharge port 9a of the dehydrated cake discharge unit 9 can be disposed below the discharge port 9a of the dehydrated cake discharge unit 9. The sludge supply unit 8 does not interfere with the arrangement of the dewatered cake transport conveyor.

Further, a back pressure plate 14 for applying a back pressure to the squeezed dewatered sludge in the squeezing and dewatering zone 10 b of the dewatering treatment chamber 10 is provided vertically at the discharge port 9 a of the dewatered cake discharge unit 9. The back pressure plate 14 is configured to be pressed by an air spring or an actuator (not shown) to narrow the width of the discharge port 9a.

Hereinafter, the operation mode of the rotary pressure dehydrator according to Embodiment 1 of the present invention will be described. That is, according to the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the sludge conditioned by the addition / mixing of the polymer flocculant is converted to a maximum of 100 kPa (about 1) by a sludge press-fitting pump (not shown). To 0.0 kgf / cm ² ). The pressurized sludge is rotated at a slow speed of 0.5 to 1.3 rpm through the sludge inlet 8a, the sludge flow path, and the sludge inlet 10a that open to the lower side of the sludge supply unit 8. Although it is continuously supplied to the filtration zone 10b on the lower side of the dehydration processing chamber 10, it is efficiently dehydrated because a wider filtration area is formed near the sludge inlet 10a in the dehydration processing chamber 10. And the sludge supplied to the lower filtration zone 10b of the dehydration processing chamber 10 is filtered by this filtration zone 10b, and fluidity | liquidity is lost gradually.

  The sludge whose fluidity has been reduced by filtration in the filtration zone 10b gradually forms a cake layer on the surfaces of the disk-shaped first filter plate 6 and the second filter plate 7 provided with a large number of water permeation holes. The first filtration plate 6 and the second filtration plate 7 move to the squeeze dehydration zone 10c side by the rotation. Since the trapping of the solid matter is improved by the cake layer formed on the surfaces of the first filter plate 6 and the second filter plate 7, the filtrate is cleaned.

The sludge in the compressed dewatering zone 10c region has a maximum back pressure of 600 kPa by pressing force control (air spring, actuator air pressure control) of the back pressure plate 14 provided at the discharge port 9a of the dewatered cake discharge unit 9. It is kept at a constant pressure (adjustable) of (about 6.0 kgf / cm ² ). The sludge that has lost its fluidity is squeezed and dehydrated by the shearing force generated by the first filter plate 6 and the second filter plate 7 and the back pressure generated by the back pressure plate 14. Then, the dehydrated cake having a low water content that has been pressed and dehydrated is pushed out of the back pressure plate 14 and discharged from the dehydrated cake discharge unit 9 to the outside of the machine.

  In the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the sludge supplied from the sludge supply unit 8 to the filtration zone 10b below the dehydration treatment chamber 10 of the rotary pressure dehydrator 1 is as described above. And filtered. Subsequently, it moves to the upper pressing dehydration zone 10c, where it is pressed and dehydrated to become a dehydrated cake. However, since the non-dehydrated sludge has a high fluidity, it does not move from the filtration zone 10b to the squeezing and dehydration zone 10c, and is filtered without fail in the lower filtration zone 10b and loses its fluidity. It moves to the dehydration zone 10c. Therefore, unlike the conventional rotary pressure dehydrator according to the conventional example, the dewatered cake having a low dewatering rate is not discharged from the discharge port of the dewatered cake discharging unit, and the sludge is stably dewatered.

Further, according to the rotary pressure dehydrator 1 according to the first embodiment of the present invention, the upper surface 5b of the partition spacer 5 on the dehydrated cake discharger 9 side and the rotation center O of the filter plate, that is, the rotation of the drive shaft 2 is achieved. Since the distance between the horizontal line passing through the center O is large, as shown in FIG. 4, the horizontal line passing through the rotation center O of the filter plate, and the upper surface 5b on the dehydrated cake discharger 9 side of the rotation center O and the partition spacer 5 are provided. An angle θ ₂ formed with a line connecting the pressing positions P is larger than θ ₁ shown in FIG. Accordingly, the horizontal component force acting on the dehydrated cake (the propulsive force in the direction of discharging the dehydrated cake) Fx ₂ becomes Fsin θ _{2 and} is larger than Fx ₁ shown in FIG. 6, and thus the effect that the dehydrated cake is easily discharged is obtained. be able to. Moreover, since the sludge flow path of the pressure dehydration zone 10c on the upper side of the dehydration treatment chamber 10 is gradually narrowed toward the dewatered cake discharge part 9, the effect that the sludge is compacted and dehydrated well is obtained. Can do.

  By the way, the dehydrated cake is also pressed against the upward guide surface 5c connected to the upper surface 5b of the partition spacer 5 on the dehydrated cake discharge portion 9 side. However, the moisture content of the dehydrated cake is higher than the moisture content of the dehydrated cake pressed on the upper surface 5b side, and the fluidity is high. In addition, the upward guide surface 5c also moves toward the dehydrated cake discharge section 9 side. Since it is away from the horizontal line passing through the rotation centers O of 6 and 7, there is no problem in the movement of the portion of the dehydrated cake partitioning spacer 5 side to the dehydrated cake discharge portion 9 side.

  Furthermore, in the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the upper end 10a ′ of the sludge inlet 10a of the sludge supply unit 8 is positioned on the upper surface 5b of the partition spacer 5 on the dehydrated cake discharge unit 9 side. Accordingly, the position is set so as to be moved to the upper surface 5b side (position higher than the rotation center of the drive shaft 2). Therefore, according to the rotary pressure dehydrator 1 according to the first embodiment of the present invention, the amount of movement of the partition spacer 5 toward the upper surface 5b side on the dehydrated cake discharger 9 side without impairing the strength of the partition spacer 5. The filtration area according to the size is increased. Therefore, a wider filtration area can be secured in the vicinity of the sludge inlet 10a in the dehydration treatment chamber 10, which can contribute to the improvement of the sludge dewatering ability.

  In addition, according to the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the sludge inlet 8a of the sludge supply unit 8 into which the sludge to which the flocculant is added and mixed flows is downward as described above. It is open. Therefore, flocs generated by adding / mixing the flocculant are less likely to be damaged, so that the amount of the polymer flocculant added / mixed can be reduced, which can greatly contribute to the reduction of sludge dewatering cost. An excellent economic effect can also be obtained.

  Next, a rotary pressurizing dehydrator according to Embodiment 2 of the present invention will be described with reference to the accompanying drawings. FIG. 5 is a plan view showing a schematic configuration of the outer ring spacer of the rotary pressurizing dehydrator according to Embodiment 2 of the present invention. The difference between the rotary pressure dehydrator according to Embodiment 2 of the present invention and the rotary pressure dehydrator according to Embodiment 1 is the difference in the shape of the upward guide surface of the partition spacer. Since they have exactly the same configuration, the same components and components having the same functions are denoted by the same reference numerals and different points will be described.

  That is, the rotary pressure dehydrator 1 according to the second embodiment of the present invention is well understood in comparison with FIG. 3 of the plan view of the outer ring spacer according to the rotary pressure dehydrator according to the first embodiment. Moreover, the upward guide surface 5c connected to the horizontal upper surface 5b of the partition spacer 5 on the side of the dehydrated cake discharger 9 is a flat inclined surface. Therefore, since the curved surface convex upward is gradually changed into a slope, the rotary pressure dehydrator according to the second embodiment of the present invention rotates according to the first embodiment. An effect equivalent to that of a pressure dehydrator can be obtained.

  In Embodiments 1 and 2 described above, the upper surface of the partition spacer 5 on the side of the dehydrated cake discharger 9 is described as an example. However, the present invention is not limited to such a configuration. Absent. That is, it is only necessary to reduce the angle θ formed between the pressing force F, which is expressed by a vector with respect to the upper surface 5b of the dehydrated cake, and the upper surface 5b of the partition spacer 5, so that the upper surface is dehydrated cake. It may be inclined upward (for example, 5 ° or less) toward the discharge unit 9 or may be inclined downward.

  Further, the rotary pressure dehydrator in which a disk-shaped filter plate having a filtration surface provided with a large number of water permeation holes is provided on both sides in the width direction of the dehydration treatment chamber has been described as an example. However, for example, if a disc-shaped filter plate is disposed in any one of the width directions of the dehydration chamber, a certain effect can be obtained. Moreover, although the case where punching metal was used for the filter plate was demonstrated, if it is a member which can isolate | separate sludge and a water | moisture content, such as a wedge wire screen, it can utilize. Accordingly, the rotary pressurization dehydrator according to the first and second embodiments is merely a specific example of the present invention, and design changes and the like within a range not departing from the technical idea of the present invention are free. The form of the pressure dehydrator is not limited to the form of the rotary pressure dehydrator according to the first and second embodiments.

1 is a partially omitted side view showing a schematic configuration of a rotary pressure dehydrator according to Embodiment 1 of the present invention. It is the sectional view on the AA line of FIG. It is a top view which shows schematic structure of the outer ring | wheel spacer of the rotary pressurization dehydrator which concerns on Embodiment 1 of this invention. FIG. 6 is an explanatory diagram of horizontal component force (propulsive force in the discharging direction of the dewatered cake) acting on the dewatered cake according to the first embodiment of the present invention. It is a top view which shows schematic structure of the outer ring | wheel spacer of the rotary pressurization dehydrator which concerns on Embodiment 2 of this invention. It is explanatory drawing of the horizontal component force (propulsive force to the discharge direction of a dewatering cake) which acts on a dewatering cake.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotary pressure dehydrator 2 ... Drive shaft, 2a ... Sink key 3 ... Inner ring spacer, 3a ... Boss part 4 ... Outer ring spacer 5 ... Partition spacer, 5a ... Washing water discharge, 5b ... Upper surface, 5c ... Upward guide surface DESCRIPTION OF SYMBOLS 6 ... 1st filter plate, 6a ... Water permeation 7 ... 2nd filter plate, 7a ... Water permeation hole 8 ... Sludge supply part, 8a ... Sludge inlet 9 ... Dehydrated cake discharge part, 9a ... Discharge port 10 ... Dehydration processing chamber, DESCRIPTION OF SYMBOLS 10a ... Sludge inlet, 10a '... Upper end (sludge inlet), 10b ... Filtration zone, 10c ... Squeeze dehydration zone, 10d ... Scraper 11 ... First cover 12 ... Second cover 13 ... Drain pipe 14 ... Back pressure plate O ... Rotation center of filter plate (drive shaft)

Claims (4)

  A sludge supply unit that feeds sludge into a dewatering chamber equipped with a disk-shaped filter plate that is rotated by a horizontal drive shaft and has a large number of water-permeable holes on at least one side in the width direction, and discharges dewatered cake In the rotary pressure dehydrator in which the dewatering cake discharge portion is partitioned by a partition spacer, the dewatering cake discharge portion is disposed above the center of rotation of the disk-shaped filter plate. And a position for discharging the sludge from the outer peripheral part of the dehydration chamber, the sludge supply part being below the dewatered cake discharge part, and a position for supplying the sludge from the outer peripheral part of the dehydration chamber to the dehydration room The upper outer periphery of the inner ring spacer is disposed between the upper surface of the partition spacer on the dehydrated cake discharge portion side and the upper outer peripheral surface of the inner ring spacer rotated by the drive shaft. Rotation pressurized dehydration machine characterized by comprising formed upward guide surface gradually increases As the toward the upper surface side from.   The rotary pressure dehydrator according to claim 1, wherein the upward guide surface of the partition spacer is a curved surface whose gradient gradually changes.   The rotary pressure dehydrator according to claim 1, wherein the upward guide surface of the partition spacer is an inclined surface.   The upper end of the sludge inlet of the sludge supply unit is moved to the upper surface side from the horizontal line passing through the center of rotation of the disk-shaped filter plate according to the position of the upper surface of the partition spacer on the dewatered cake discharge unit side. The rotary pressure dehydrator according to any one of claims 1 to 3, wherein the rotary pressure dehydrator is set to be in a position.

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