JP4051394B1 - Rotary pressure dehydrator - Google Patents

Abstract

[PROBLEMS] To reduce the number of particles and dehydrated cake pieces in sludge adhered to the surface of the filter plate by reliably contacting the entire width of the filter plate despite the small number of arrangements and the simple configuration. A rotary pressure dehydrator provided with a scraper with a simple structure that can be taken.
A scraper is provided in a dehydration treatment chamber 11 of a rotary pressure dehydrator 1 and scrapes off a fine particle lump and dehydrated cake pieces in sludge adhering to the inner side surfaces of a first filter plate 7 and a second filter plate 8. A spacer support boss that constitutes the boss member 3 together with the first filter plate support boss and the second filter plate support boss by fastening one end side of 11d to the side surface of the outer ring spacer with a countersunk screw and the other end side using a countersunk screw The scraper 11d is fastened to the side surface of the inner ring spacer 4 that is externally fitted to the scraper 11d.
[Selection] Figure 1

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.

  Among the dehydrators that concentrate and dewater sludge such as industrial wastewater sludge and sewage sludge, for example, there is a rotary pressure dehydrator. Hereinafter, two conventional examples of typical rotary pressure dehydrators according to the conventional example will be described. First, a rotary pressurizing dehydrator according to Conventional Example 1 will be described with reference to FIG. The rotary pressure dehydrator 51 includes an inner ring spacer 53, an outer ring spacer 54, a screen (hereinafter referred to as a filter plate) 55, a rotation shaft (corresponding to a drive shaft), a partition plate, an outer casing, a drive device, and a control device. Etc. are constituted. Further, a large number of scrapers 64 are attached to the outer ring spacer 54 of the rotary pressurizing dehydrator 51, and the inner part of the filter plate 55 that rotates in a predetermined direction (the counterclockwise arrow R direction in FIG. 6). It is comprised so that the fine particle lump in the processing stock solution adhering to the side may be scraped off.

  More specifically, the scrapers 64 are attached by fixing the base end portion 64 c to the side surface of the outer ring spacer 54 with the tip end portion 64 b pointing toward the inner ring spacer 53. Then, the edge 64a of the scraper 64 makes an acute contact with the inner surface of the filter plate 55, thereby scraping the fine particle mass and dehydrated cake pieces in the processing stock solution (sludge) adhering to the surface of the filter plate 55. Is configured to take.

  The scraper 64 is attached to each of the two side surfaces of the outer ring spacer 54 by 12 pieces (a total of 24 pieces on both sides), and the initial filtration zone Q1 (about 120 to 140 ° from the raw material supply port 58). (The zone of the range) is densely arranged (so that the interval S between the adjacent scrapers 64 on one side surface of the outer ring spacer 54 is smaller than the width dimension W of one scraper 64). Therefore, not only the dehydrated cake pieces adhering to the surface of the filter plate 55 in the entire dehydration process are scraped, but also the fine particle mass in the processing stock solution (sludge) adhering to the surface of the filter plate 55 is suitably scraped. And the situation where the filter plate 55 is covered with the dehydrated cake pieces and the fine particle lump can be avoided in the entire initial filtration zone Q1 (for example, Patent Literature 1). Reference.).

  Next, the rotary pressure dehydrator according to Conventional Example 2 will be described with reference to FIG. 8 which is a side view showing the internal structure. The rotary pressure dehydrator 71 according to the conventional example 2 includes a partition plate, an outer ring spacer 72, an inner ring spacer 73, an outer ring spacer 74, filter plates 75a and 75b, and a deflector (corresponding to a partition spacer) 76. It is comprised from a casing, a drive device, a control apparatus, etc. Further, three short scrapers 85 (85a to 85f) are attached to both side surfaces of the outer ring spacer 74 of the rotary pressurizing dehydrator 71 (total of six on both sides). The edges of these short scrapers 85 are in acute contact with the inner surface of the filter plate 75, and the filter plate 75 rotates in a predetermined direction (counterclockwise arrow R direction in FIG. 7). (75a, 75b) is configured to scrape the fine particle lump attached to the inner side surface.

It should be noted that a scraper of a normal length (the tip of the scraper 85 reaches the immediate vicinity of the inner ring spacer 73 and the fine particle mass adhering to the inner side surfaces of the filter plates 75a and 75b is completely removed between the short scraper 85 and the stock solution supply port 78. Also disclosed is a rotary pressure dehydrator according to an embodiment in which a scraper is disposed, and a rotary pressure dehydrator according to an embodiment in which short scrapers and normal length scrapers are alternately disposed. (For example, refer to Patent Document 2).
JP 2004-291036 A JP 2006-341258 A

  According to the rotary pressure dehydrator according to the above conventional example, the lump of fine particles and the dehydrated cake pieces in the processing stock solution adhering to the inner surface of the filter plate can be scraped by the scraper, and good filtration efficiency can be maintained. It can be considered excellent because it is possible. However, as described above, the scraper has a base end side fixed to the outer ring space, and a tip end side is a free cantilever support structure and bends. Therefore, a fine particle lump in the processing stock solution adhered to the surface of the rotation center side of the filter plate. It is difficult to completely remove the dehydrated cake piece by scraping, and a sufficient filtration function cannot be secured over the entire width of the filter plate. In other words, in order to ensure a sufficient filtration function over the entire width of the filter plate, a larger number of scrapers must be provided, and the structure of the rotary pressure dehydrator becomes complicated. The machine itself becomes expensive. In addition, since the scraper has to be tapered in order to provide a larger number of scrapers, the configuration is complicated, so the scraper itself is also a factor in increasing the cost of the rotary pressure dehydrator.

  Accordingly, the object of the present invention is to make sure that the number of particles in the sludge adhered to the surface of the filter plate is surely contacted over the entire width of the filter plate despite the fact that the number of arrangements is small and the structure is simple. An object of the present invention is to provide a rotary pressure dehydrator equipped with a scraper having a simple structure capable of scraping off dehydrated cake pieces well.

  The inventors only have to fix both ends of the scraper in order to ensure that the scraper contacts the entire width of the filter plate. If the scraper can be reliably contacted over the entire width of the filter plate, the number of scrapers disposed can be reduced. If the number of scrapers disposed is small, the width dimension over the entire length of the scraper is made the same. However, the present invention has been realized by considering that there is no problem in the arrangement.

Therefore, in order to solve the above-mentioned problem, the means adopted by the rotary pressurization dehydrator according to claim 1 of the present invention is rotated by a horizontal drive shaft and has a plurality of water permeable holes at least on one side in the width direction. A dewatering chamber having a disc-shaped filter plate whose side surface near the outer edge is in sliding contact with the side surface of the outer ring spacer, and a sludge supply section for supplying sludge into the dewatering chamber, and a dehydrated cake. In the rotary pressure dehydrator provided with a dewatering cake discharging unit for discharging, and a scraper that is in acute contact with the side surface of the filter plate on the dehydration processing chamber side, one end side of the scraper is on the outer ring spacer side is fixed to the outer peripheral portion of the drive shaft, have a side that the rotational center side of the side surface of the filter plate is in sliding contact with an annular inner spacer to permit rotation of the filter plate is provided, the inner ring space It is characterized in that the other end of the scraper on the side is fixed.

  The rotary pressure dehydrator according to claim 2 of the present invention employs a rotary pressurization dehydrator according to claim 1, wherein a boss member is externally fitted to the drive shaft, and the boss member is the disc. A filter plate support boss for rotating the filter plate and a spacer support boss on which the inner ring spacer is fitted through a slide bearing are integrally fastened by fastening means.

  The rotary pressure dehydrator according to claim 3 of the present invention employs the rotary pressure dehydrator according to any one of claims 1 and 2, wherein the sludge supply unit and the dewatered cake A partition spacer for partitioning the discharge portion is provided, and the inner ring spacer is formed integrally with the partition spacer.

  The rotary pressure dehydrator according to claim 4 of the present invention employs the rotary pressure dehydrator according to any one of claims 1 to 3, wherein the width dimension of the scraper is the total length. It is characterized in that it is set to the same width dimension.

  In the rotary pressure dehydrator according to the first to fourth aspects of the present invention, one end side of the scraper that is in acute contact with the side surface on the dehydration treatment chamber side of the disc-shaped filter plate constituting the dehydration treatment chamber is fixed to the outer ring spacer side. Has been. The other end side of the scraper is fixed to the annular inner ring spacer side. Therefore, according to the rotary pressure dehydrator according to claims 1 to 4 of the present invention, since the scraper can be reliably brought into contact with the entire width of the filter plate, the sludge adhering to the screen is surely scraped off. Thus, the dewatering efficiency can be improved and the number of scrapers can be reduced, which can greatly contribute to the simplification of the configuration of the rotary pressure dehydrator and the cost reduction.

  In the rotary pressure dehydrator according to claims 1 to 4 of the present invention, since the other end side of the scraper whose one end side is fixed to the outer ring spacer side is fixed to the inner ring spacer side, the inner ring spacer is related to the conventional example. It does not rotate like an inner ring spacer. Therefore, according to the rotary pressure dehydrator according to claims 1 to 4 of the present invention, the dewatering cake that contacts the outer peripheral surface of the inner ring spacer is the filter plate as well as the dewatering cake that contacts the inner peripheral surface of the outer ring spacer. Since the outer ring surface of the inner ring spacer is slid and moved by the rotational force, the sludge dewatering process is not hindered.

  In the rotary pressure dehydrator according to claim 2 of the present invention, the boss member fitted on the drive shaft includes a filter plate support boss for rotating the disk-shaped filter plate, and an inner ring spacer through the slide bearing. The spacer support boss is integrally fastened by fastening means. Therefore, according to the rotary pressure dehydrator according to claim 2 of the present invention, after the inner ring spacer is externally fitted to the spacer support boss via the slide bearing, the filter plate support boss and the spacer support boss are integrated by the fastening means. The inner ring spacer can be easily positioned in the dehydration processing chamber by fastening in place.

  According to the rotary pressure dehydrator according to claim 3 of the present invention, the partition spacer that partitions the sludge supply unit and the dewatered cake discharge unit is provided, and the inner ring spacer is configured integrally with the partition spacer. Since a part of the rotational force of the inner ring spacer accompanying the movement of the dewatered cake is received by the partition spacer, the strength of the scraper can be made lower than that in the case of the first aspect. Therefore, the scraper can be manufactured inexpensively and easily.

  According to the rotary pressure dehydrator according to claim 4 of the present invention, the width dimension of the scraper is set to the same width dimension over the entire length. Accordingly, the scraper can be manufactured at a low cost because the configuration is simpler and the number of processing steps is smaller than that of the conventional scraper having a tapered configuration.

  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 pressurizing dehydrator according to Embodiment 1 of the present invention, with a part of a cover cut away, and FIG. 2 is a sectional view taken along line AA in FIG. 3 is an enlarged view of a portion B in FIG. 2, FIG. 4 (a) is an explanatory view of a state in which the scraper is attached to the outer ring spacer, and FIG.

  Reference numeral 1 shown in the figure is a rotary pressure dehydrator according to Embodiment 1 of the present invention. The rotary pressure dehydrator 1 includes a drive shaft 2 that is rotated at a rotational 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 a boss member 3 that is rotated through a key 2a by the rotation of the drive shaft 2 and rotates a first filter plate and a second filter plate, which will be described later. The boss member 3 includes a first filter plate support boss 31, a second filter plate support boss 32, and a spacer support interposed between the first filter plate support boss 31 and the second filter plate support boss 32. The boss 33 is constituted by mechanical fastening means 34 including fastening bolts, nuts, and washers for fastening them together.

  More specifically, the first filter plate support boss 31 constituting the boss member 3 is fitted on the shaft end side of the drive shaft 2 and has a flange portion on the drive device side (not shown). The second filter plate support boss 32 constituting the boss member 3 is fitted to the drive device side (not shown) of the drive shaft 2, and the first filter plate support boss 31 is disposed on the shaft end side of the drive shaft 2. A flange portion having the same outer diameter as that of the flange portion is provided. The spacer support boss 33 constituting the boss member 3 fitted between the first filter plate support boss 31 fitted on the drive shaft 2 and the second filter plate support boss 32 has an outer diameter of the first. 1, 2 is formed in a disk shape having a smaller diameter than the outer diameter of the flange portion of the filter plate support bosses 31, 32. These are integrally fastened by the flange portions of the first and second filter plate support bosses 31 and 32 and the mechanical fastening means 34 penetrating the spacer support boss 33.

  The flange portion of the first filter plate support boss 31 includes a large-diameter flange portion 31a on the shaft end side and a small-diameter flange portion 31b on the spacer support boss 33 side whose outer diameter is slightly smaller than the outer diameter of the spacer support boss 33. It is made up of. And the fitting hole provided in the center part of the disk-shaped 1st filtration board 7 provided with many water permeable holes 7a is fitted by the small diameter flange part 31b of the said flange part, and this 1st filtration is carried out. The side surface on the fitting hole side of the plate 7 is fixed in a state where it abuts on the surface on the spacer support boss 33 side of the large-diameter flange portion 31a. In addition, the code | symbol 7b is a reinforcement rib for reinforcing the 1st filtration board 7, Comprising: Although this illustration of the reinforcement rib 7b is abbreviate | omitted, it is radial centering on the rotation center O of this 1st filtration board 7. Is provided.

  The flange portion of the second filter plate support boss 32 includes a large-diameter flange portion 32a on the drive device side (not shown) and a small-diameter flange on the spacer support boss 33 side whose outer diameter is slightly smaller than the outer diameter of the spacer support boss 33. It consists of part 32b. And the fitting hole provided in the center part of the disk-shaped 2nd filtration board 8 provided with many water-permeable holes 8a is fitted by the small diameter flange part 32b of the said flange part, and this 2nd filtration is carried out. The side surface on the fitting hole side of the plate 8 is fixed in a state where it abuts on the surface on the spacer support boss 33 side of the large-diameter flange portion 32a. In addition, the code | symbol 8b is a reinforcement rib for reinforcing the 2nd filtration board 8, Comprising: Although this illustration of the reinforcement rib 8b is abbreviate | omitted, it is radial centering on the rotation center of this 2nd filtration board 8. Is provided.

An annular inner ring spacer 4 having a sliding bearing 4a fitted in a fitting hole is fitted on the spacer support boss portion 33 so as to be rotatable. The width dimension of the inner ring spacer 4 is set so that the side surface thereof can be in sliding contact with the inner surface of the first filter plate 7 and the second filter plate 8 on the fitting hole side.
An outer ring spacer 5 is provided outside the inner ring spacer 4 so as to be concentric with the center of the diameter of the inner ring spacer 4. The first filter plate 7 and the second filter plate 8 are disposed on the side surfaces of the outer ring spacer 5. It is comprised so that the side surface vicinity of the outer end edge may slidably contact. Note that the first filter plate 7 and the second filter plate 8 of the rotary pressurization dehydrator 1 according to the first embodiment are both punching metal having a water permeation hole having a diameter of 0.5 mm. In the case of a rotary pressure dehydrator, the diameter of the water permeation hole of the filter plate is in the range of 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.

  The outer ring spacer 5 is provided with a partition spacer 6 having a concave curved surface in close contact with the outer peripheral surface of the inner ring spacer 4 on the center side of the outer ring spacer 5. The partition spacer 6 is formed in a bifurcated shape including an upper partition spacer 6a and a lower partition spacer 6b at a lower position across the space 6c from the upper partition spacer 6a. And the sludge inflow port 11a which becomes the structure mentioned later opened horizontally is formed under the lower partition spacer 6b of this partition spacer 6. As shown in FIG. In addition, a dehydrated cake discharge portion 10 that opens in the horizontal direction is provided above the upper partition spacer 6 a of the partition spacer 6. Further, cleaning water is sprayed into the space 6 c of the partition spacer 6 from the outer surface side of the first and second filter plates 7 and 8 to clean the first and second filter plates 7 and 8. A water injection device (not shown) is provided.

  Between the outer peripheral surface of the inner ring spacer 4, the inner peripheral surface of the outer ring spacer 5, the first filter plate 7, and the second filter plate 8, the sludge inlet 11 a is connected to the dehydrated cake discharge unit 10 side. The dehydration treatment chamber is divided into a filtration zone 11b for filtering the conditioned sludge flowing in from the sludge inlet 11a and a squeezing dehydration zone 11c for squeezing and dewatering the sludge from which filtered water has been removed. 11 is formed. The sludge inlet 11a is attached with a sludge inlet 9a that opens downward, and a sludge supply unit 9 that supplies the sludge to the sludge inlet 11a through a sludge channel. Further, a back pressure plate 15 for applying a back pressure to the squeezed dewatered sludge in the squeezing and dewatering zone 11 c of the dewatering treatment chamber 11 is provided vertically at the discharge port 10 a of the dewatered cake discharge unit 10. The back pressure plate 15 is configured to be pressed by an air spring or actuator (not shown) to narrow the width of the discharge port 10a.

  In the dehydration chamber 11, the edges are in acute contact with the opposing surfaces (inner surfaces) of the first filter plate 7 and the second filter plate 8, so that the first filter plate 7 and the second filter plate 11 are in contact with each other. Three scrapers 11d (six on both sides) are provided for scraping off the lump of fine particles in the sludge and the dehydrated cake adhering to each of the inner surfaces facing the plate 8. The width of these scrapers 11d is set to the same width dimension (for example, 32 mm) over the entire length.

  The flow path width of the dehydration chamber is not reduced as much as possible by the scraper 11d provided on the first filter plate 7 side and the scraper 11d provided on the second filter plate 8 side (that is, the scrapers 11d in FIG. It is preferable to provide the scraper 11d from the viewpoint of smoothly moving the sludge toward the discharge port 10a. Further, the position on the outer ring spacer side on one end side of the scraper is provided so as to be closer to the rotation destination side of the filter plate than the position on the inner ring spacer side (drive shaft side) on the other end side. By providing in such a direction, the dewatered cake piece scraped by the scraper receives an acting force in the direction of the outer ring spacer, so the degree of decrease in the density of the dewatered cake at a position away from the rotation center of the filter plate is reduced. Since it can reduce, since the squeezing force distribution over the full width of the filtration surface of a filter plate is equalized, the filtration function over the full width of a filtration surface is improved, and it is preferable.

  Each of these scrapers 11d is fastened, that is, fixed to the side surface of the outer ring spacer 5 on one end side and to the side surface of the inner ring spacer 4 on the other end side by two countersunk screws as fastening means. Hereinafter, since the fastening state to the side surface of the outer ring spacer 5 on one end side of the scraper 11d and the fastening state to the side surface of the inner ring spacer 4 on the other end side are completely the same, FIG. 4 (a) and FIG. The fastening to the side surface of the outer ring spacer 5 of the scraper 11d will be described as an example with reference. That is, one end of each of the scrapers 11d is fastened to the mounting notch provided on the side surface of the outer ring spacer 5 by two countersunk screws 11e. Therefore, the inner ring spacer 4 of the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention is configured to be rotated by the drive shaft 2 like the inner ring spacer of the rotary pressure dehydrator according to the conventional example. Absent. However, since the dewatered cake slides on the outer peripheral surface of the inner ring spacer 4 as the first and second filter plates 7 and 8 rotate in the same manner as the dehydrated cake that contacts the inner peripheral surface of the outer ring spacer 5, There is no problem with the dehydration process.

  A first cover 12 is disposed outside the first filter plate 7, and a flange portion of the first cover 12 is fixed to a side surface of the outer ring spacer 5. A second cover 13 is disposed outside the second filter plate 8, and a flange portion of the second cover 13 is fixed to a side surface of the outer ring spacer 5. A drain pipe 14 projecting downward is provided at the lower part of each of the first cover 12 and the second cover 13, and is supplied into the dehydration treatment chamber 11 through the sludge supply unit 9 and the sludge inlet 9 a, The water in the sludge discharged into the first cover 12 and the second cover 13 through the many water-permeable holes 7a, 8a provided in the first and second filter plates 7, 8 is the drainage. The pipe 14 is drained out of the machine.

Hereinafter, an operation mode of the rotary pressure dehydrator 1 according to the first embodiment 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 dewatering in which the pressurized sludge is rotated at a slow speed of 0.5 to 1.3 rpm via the sludge inlet 9a, the sludge flow path, and the sludge inlet 11a that open to the lower side of the sludge supply section 9. Continuously supplied to the filtration zone 11b below the processing chamber 11 and efficiently dehydrated. And the sludge supplied to the lower filtration zone 11b of the dehydration processing chamber 11 is filtered in the filtration zone 11b, and the fluidity is gradually lost.

  Sludge whose fluidity has been reduced by filtration in the filtration zone 11b is gradually forming a cake layer on the surfaces of the disk-shaped first filter plate 7 and the second filter plate 8 provided with a large number of water permeation holes. The first filter plate 7 and the second filter plate 8 are rotated to move toward the squeezing and dehydrating zone 11c. Since the trapping of the solid matter is improved by the cake layer formed on the surfaces of the first filter plate 7 and the second filter plate 8, the filtrate is cleaned.

The sludge in the compressed dewatering zone 11c region has a maximum back pressure of 600 kPa by pressing force control of the back pressure plate 15 (air spring, actuator air pressure control) provided at the discharge port 10a of the dewatered cake discharge unit 10. 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 shear force generated by the first filter plate 7 and the second filter plate 8 and the back pressure generated by the back pressure plate 15. Then, the dehydrated cake having a low water content that has been squeezed and dehydrated is pushed out of the back pressure plate 15 and discharged from the dehydrated cake discharge unit 10 to the outside of the machine.

  In the sludge dewatering step as described above, in the rotary pressure dewatering machine 1 according to Embodiment 1 of the present invention, the scraper 11d having one end fastened to the side of the outer ring spacer 5 and the other end fastened to the side of the inner ring spacer 4. As a result, the lump of fine particles and the dehydrated cake in the sludge adhering to each of the opposing inner surfaces of the first filter plate 7 and the second filter plate 8 are scraped off. Therefore, according to the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, clogging of the water permeation holes 7a and 8a of the first filter plate 7 and the second filter plate 8 is prevented, and sludge is efficiently obtained. Since it can be dehydrated, it can greatly contribute to the improvement of sludge treatment efficiency.

  In order to confirm the sludge dewatering capacity of the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the other end of the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention and the scraper 11d is connected to the inner ring. The countersunk machine screw fastened to the side surface of the spacer 4 is removed, only one end side is fastened to the outer ring spacer 5, and the position on the inner ring spacer side on the other end side of the scraper is filtered more than the position on the outer ring spacer side on one end side. A sludge dewatering test was performed on a rotary pressure dehydrator (hereinafter referred to as a conventional rotary pressure dehydrator) on the plate rotation destination side.

As a result, in the case of the conventional rotary pressure dehydrator, the solids processing amount (sludge supply amount) is 116 kg-DS / m ² / hour, and the moisture content of the dehydrated cake obtained by dehydration is 82.5%. (Chemical injection rate (ratio of solids) was about 0.9%). On the other hand, in the case of the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the amount of solids processed (sludge supply amount) is 136 kg-DS / m ² / hour, and the water content of the dehydrated cake obtained by dehydration The rate was 79.6% (the chemical injection rate (solids ratio) was about 0.9%, which was the same as in the conventional type). Therefore, according to the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the solids throughput can be increased by 15% or more compared to the conventional rotary pressure dehydrator, and the moisture content of the dehydrated cake can be increased. Can be reduced by about 3% or more. In addition, the solids recovery rate was 95% or more. The water content of the sludge supplied to the sludge inlet of the conventional rotary pressure dehydrator and the sludge inlet 11a of the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention for the dehydration treatment is The coagulant used in this dehydration test is a cationic polymer coagulant.

  Moreover, in the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, as described above, one end side of the scraper 11d is fastened to the side surface of the outer ring spacer 5 by the two countersunk screws 11e, and the other end side is two. It is fastened to the side surface of the inner ring spacer 4 by a countersunk machine screw 11e. Therefore, since the end side does not bend like the scraper of the rotary pressure dehydrator according to the conventional example, each scraper 11d is surely secured over the entire inner surface of the first and second filter plates 7 and 8. Can be contacted.

  Therefore, according to the rotary pressure dehydrator 1 according to Embodiment 1 of the present invention, the number of scrapers 11d can be reduced as compared with the rotary pressure dehydrator according to the conventional example, and the rotary pressure dehydrator can be reduced. This can greatly contribute to the simplification and cost reduction of the one configuration. Moreover, in the rotary pressurization dehydrator 1 according to the first embodiment, the width dimension of the scraper 11d is set to the same width dimension over the entire length. Therefore, the configuration is simpler than the conventional scraper having a tapered configuration, the number of processing steps is small, and the scraper 11d can be manufactured at a low cost, which contributes to the cost reduction of the rotary pressure dehydrator 1. Can do.

  A rotary pressurizing dehydrator according to Embodiment 2 of the present invention will be described with reference to FIG. 5 which is a partially omitted side view showing a schematic configuration of a rotary pressurizing dehydrator with a part of a cover cut away. The difference between the rotary pressure dehydrator according to the second embodiment of the present invention and the rotary pressure dehydrator according to the first embodiment is the difference in configuration between the partition spacer and the inner ring spacer. Since the configuration is the same except for the differences, the same components and the components having the same functions are denoted by the same reference numerals, and different points will be described.

  That is, the partition spacer 6 of the rotary pressurizing dehydrator according to Embodiment 2 of the present invention is similar to the conventional example 1 in that the upper partition spacer 6a on the upper side across the space 6c and the lower partition on the lower side. The partition spacer 6 is configured integrally with the inner ring spacer 4. As in the case of the rotary pressurization dehydrator 1 according to the first embodiment, the sliding bearing 4a is fitted in the fitting hole provided in the center of the inner ring spacer 4, and the same over the entire length. One end side of the scraper 11d set to the width dimension is fastened to the side surface of the outer ring spacer 5 by two countersunk screws, and the other end side is fastened to the side surface of the inner ring spacer 4 by two countersunk screws.

  The rotary pressure dehydrator according to Embodiment 2 of the present invention is the same as the rotary pressure dehydrator according to Embodiment 1 except that the partition spacer 6 and the inner ring spacer 4 are integrally configured. 1 has the same configuration as that of the rotary pressurizing dehydrator 1 according to the first embodiment. In the case of the rotary pressure dehydrator according to Embodiment 2 of the present invention, part of the rotational force of the inner ring spacer 4 accompanying the movement of sludge by the rotation of the first filter plate 7 and the second filter plate 8. Is held by the partition spacer 6. Therefore, the strength of the scraper 11d can be made lower than that of the rotary pressurization dehydrator 1 according to the first embodiment.

  A rotary pressurizing dehydrator according to Embodiment 3 of the present invention will be described with reference to FIG. 6 of the positional relation state explanatory diagram of the inner ring spacer, the outer ring spacer, and the partition spacer. The difference between the rotary pressure dehydrator according to the third embodiment of the present invention and the rotary pressure dehydrator according to the first embodiment is the difference in the configuration of the outer ring spacer. Since it is the same structure, the same code | symbol is attached | subjected to what has the same function and the same function, and the difference is demonstrated.

In the case of the rotary pressurization dehydrator 1 according to Embodiment 3 of the present invention, the dimension from the rotation center O to the inner peripheral surface of the outer ring spacer 5 is the same below the horizontal line passing through the rotation center O. Above the horizontal line passing through the rotation center O, the dimension from the rotation center O to the inner peripheral surface of the outer ring spacer 5 is set to gradually become smaller as it goes upward. More specifically, below the horizontal line passing through the rotation center O, the interval W ₀ between the intersections of the straight line passing through the rotation center O, the outer peripheral surface of the inner ring spacer 4 and the inner peripheral surface of the outer ring spacer 5 is However, as the distance W ₁ at the horizontal position is smaller than W ₀ above the horizontal line passing through the center of rotation O, it becomes W ₂ above W ₁ and W ₃ further above W _1. It is set so that the filtration area gradually decreases, that is, the filtration area gradually decreases.

  Therefore, according to the rotary pressure dehydrator 1 according to Embodiment 3 of the present invention, in the squeeze dehydration zone 11c, the squeezing action increases toward the dehydrated cake discharger 10 side, so the sludge dewatering rate is improved. The effect of doing can be obtained. In the third embodiment of the present invention, the inner ring spacer 4 and the partition spacer 6 are separated from each other. However, as in the second embodiment, the inner ring spacer 4 and the partition spacer 6 are integrally configured. May be.

  By the way, in the said embodiment, although the scraper 11d demonstrated the rotary pressurization dehydrator fixed to the outer ring spacer 5 and the inner ring spacer 4 with the countersunk screw as an example, it is not limited to this. A groove may be provided in each of the spacer 5 and the inner ring spacer 4, and the end portion of the scraper 11d may be fixed by being inserted into each groove. Further, the rotary pressure dehydrator in which a disk-shaped filter plate having a filtration surface in which a large number of water permeation holes are provided on both sides in the width direction of the dehydration treatment chamber 11 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. Further, the rotary pressure dehydrator that supplies the sludge to be dehydrated from the lower sludge supply unit and discharges the dehydrated cake from the upper dehydrated cake discharge unit has been described as an example. However, the technical idea of the present invention is also applied to the rotary pressure dehydrator according to the conventional example in which the sludge is supplied from the upper sludge supply section and the dehydrated cake discharge section is discharged from the lower dewatered cake discharge section. can do. Furthermore, the rotary pressurization dehydrator which used the punching metal for the filter plate was demonstrated as an example. However, any member that can separate sludge and moisture, such as a wedge wire screen, can be used, and is not particularly limited to punching metal.

  Therefore, the rotary pressurization dehydrator according to Embodiments 1 and 2 is only a specific example of the present invention, and design changes and the like can be freely made without departing from the technical idea of the present invention. Therefore, the form of the rotary pressure dehydrator is not limited to the form of the rotary pressure dehydrator according to the first and second embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted side view showing a schematic configuration of a rotary pressurizing dehydrator according to Embodiment 1 of the present invention, with a part of a cover cut away. It is the sectional view on the AA line of FIG. It is the B section enlarged view of FIG. FIG. 4 (a) is an explanatory diagram of the state of attachment of the scraper to the outer ring spacer, and FIG. 4 (b) is a view as seen from the arrow C in FIG. 4 (a), according to the first embodiment of the present invention. FIG. 6 is a partially omitted side view showing a schematic configuration of a rotary pressurizing dehydrator according to Embodiment 2 of the present invention, with a part of a cover cut away. FIG. 10 is an explanatory diagram showing a positional relationship between an inner ring spacer, an outer ring spacer, and a partition spacer of a rotary pressurizing dehydrator according to Embodiment 3 of the present invention. It is a principal part enlarged view of the rotary pressurization dehydrator which concerns on the prior art example 1. FIG. It is a side view which shows the internal structure of the rotary pressurization dehydrator which concerns on the prior art example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotary pressure dehydrator 2 ... Drive shaft, 2a ... Key 3 ... Boss member, 31 ... 1st filter plate support boss, 31a ... Large diameter flange part, 31b ... Small diameter flange part, 32 ... 2nd filter plate support boss 32a ... large diameter flange portion, 32b ... small diameter flange portion, 33 ... spacer support boss, 34 ... fastening means 4 ... inner ring spacer, 4a ... slide bearing 5 ... outer ring spacer 6 ... partition spacer, 6a ... upper partition spacer, 6b ... Lower partition spacer, 6c ... space 7 ... first filter plate, 7a ... water permeation hole, 7b ... reinforcement rib 8 ... second filter plate, 8a ... water permeation hole, 8b ... reinforcement rib 9 ... sludge supply section, 9a ... sludge Inlet 10: Dehydrated cake discharge part, 10a ... Discharge port 11 ... Dehydration treatment chamber, 11a ... Sludge inlet, 11b ... Filtration zone, 11c ... Squeeze dewatering zone, 11d ... Scraper, 11e ... Countersunk screw 12 ... First Rotational center of the bar 13 ... second cover 14 ... drain pipe 15 ... back plate O ... filtration plate (drive shaft)

Claims (4)

A dehydration processing chamber provided with a disk-shaped filter plate that is rotated by a horizontal drive shaft, has a large number of water-permeable holes on at least one side in the width direction, and has a side surface in the vicinity of the outer edge slidably in contact with the side surface of the outer ring spacer And a sludge supply section for supplying sludge into the dehydration chamber, a dewatering cake discharge section for discharging the dehydrated cake, and a scraper that makes acute contact with the side surface of the filter plate on the dehydration chamber side. In the rotary pressurizing and dehydrating machine provided with one end side of the scraper is fixed to the outer ring spacer side, and the outer peripheral portion of the drive shaft has a side surface on which the side surface on the rotation center side of the filter plate is in sliding contact. An annular inner ring spacer that allows rotation of the filter plate is provided, and the other end side of the scraper is fixed to the inner ring spacer side.   A boss member is externally fitted to the drive shaft, and the boss member is fastened to a filter plate support boss that rotates the disk-shaped filter plate and a spacer support boss to which the inner ring spacer is externally fitted via a slide bearing. The rotary pressure dehydrator according to claim 1, wherein the rotary pressure dehydrator is integrally fastened by means.   The partition spacer which partitions off the said sludge supply part and the said dewatering cake discharge | emission part is provided, The said inner ring spacer is comprised integrally with the said partition spacer, Either of Claim 1 or 2 characterized by the above-mentioned. The rotary pressure dehydrator according to one item.   The rotary pressure dehydrator according to any one of claims 1 to 3, wherein the width dimension of the scraper is set to the same width dimension over the entire length.

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