JP2019107650A - Solid-liquid separation device and solid-liquid separation system - Google Patents

Abstract

To provide a solid-liquid separation device which reduces a moisture content of an object to be treated and can efficiently discharge the object to be treated.SOLUTION: A solid-liquid separation device 100 includes: a screw 22 that has a first rotation axis 22a and sends a supplied object to be treated along with rotation of the first rotation axis 22a; a screw type dehydration section 2 that is arranged so as to surround the screw 22, includes a laminated filtering body 23 having a first filtering groove S1 formed thereon, and performs primary dehydration of the object to be treated; and a rotor type dehydration section 3 that includes a plurality of rotors 30 having a second rotation axis 30b and a laminate rotation filtering body 30a arranged along an axial direction of the second rotation axis 30b and having a second filtering groove S2 formed thereon, is arranged on the rear stage of the screw type dehydration section 2, and performs secondary dehydration of the object to be treated subjected to the primary dehydration by the screw type dehydration section 2. The screw 22 is structured so as to rotate at a rotation speed higher than that of the rotor 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solid-liquid separation device, and more particularly to a solid-liquid separation device and a solid-liquid separation system provided with a laminated rotary filter.

  DESCRIPTION OF RELATED ART Conventionally, the solid-liquid separation apparatus provided with a lamination | stacking rotary filter body is known (for example, refer patent document 1).

  The said patent document 1 is disclosing the solid-liquid separation apparatus provided with a rotary-body-type dehydration part. The rotary dewatering unit includes a plurality of rotary bodies disposed in upper and lower two rows, each having a rotary shaft and a laminated rotary filter disposed along the axial direction of the rotary shaft and in which filtration grooves are formed, It is comprised so that dewatering of a to-be-processed object may be performed.

JP, 2005-7327, A

  However, in the conventional solid-liquid separator as in Patent Document 1, it is necessary to rotate the rotating body at a relatively low speed, in order to lower the moisture content of the object to be treated (dehydrated cake), There is a disadvantage that the efficiency of the On the other hand, when the rotating body is rotated at a relatively high speed for efficient discharge, there is a disadvantage that the dehydration is insufficient and the water content becomes high. Therefore, in the solid-liquid separation device, there is a problem that it is difficult to simultaneously discharge the object to be treated and to lower the water content of the object to be treated.

  The present invention has been made to solve the problems as described above, and one object of the present invention is to lower the moisture content of the object to be treated and to efficiently discharge the object to be treated. Solid-liquid separation device and solid-liquid separation system.

  In order to achieve the above object, the solid-liquid separation device according to the first aspect of the present invention has a first rotation shaft, and is disposed so as to surround a screw that feeds the material to be treated supplied, (1) A screw type dewatering portion that performs primary dewatering of the object including a laminated filter body in which a filtration groove is formed, and is disposed along the axial direction of the second rotation shaft and the second rotation shaft, (2) A plurality of rotary bodies arranged in upper and lower two rows, having a laminated rotary filter body in which filtration grooves are formed, including a plurality of rotary bodies arranged in the upper and lower rows The apparatus further comprises a rotary dewatering unit for performing secondary dewatering of the object, and the screw is rotated at a higher rotational speed than the rotating body to perform gravity filtration in the screw dewatering unit, and then gravity in the screw dewatering unit Squeezing in the rotary dewatering section rather than filtration It is configured to perform over over time.

  In the solid-liquid separator according to the first aspect of the present invention, as described above, the screw type dewatering unit for performing primary dewatering of the object to be treated including the screw for feeding the object to be treated; A rotary dewatering unit is disposed downstream of the dewatering unit and performs secondary dewatering of the object to be treated. As a result, since the screw-type dewatering portion and the rotary-type dewatering portion can perform dewatering in two steps, as compared with the conventional case where the dewatering is performed in one step only by the rotary-type dewatering portion, rotation of the screw is achieved. And even if the rotation of the rotating body is accelerated, the moisture content of the object to be treated can be lowered. Therefore, the solid-liquid separation device can efficiently discharge the object while reducing the moisture content of the object. Moreover, compared with the case where a screw type dewatering part and a rotating body type dewatering part are separated, it is necessary to provide a transfer facility of an object to be treated such as piping provided between the screw type dewatering part and the rotating body type dewatering part. The device configuration can be simplified because there is no Here, in general, the squeeze filtration performed on an object to be treated containing more solid content than the object to be treated by gravity filtration takes more time than the gravity filtration. Therefore, gravity filtration is performed in the screw dewatering unit by providing a rotating dewatering unit downstream of the screw dewatering unit and rotating the screw of the screw dewatering unit at a rotational speed faster than the rotating body of the rotating dewatering unit. After that, the pressure filtration in the rotary dewatering unit can be performed by taking longer than gravity filtration in the screw dewatering unit. As a result, the water content of the object to be treated can be effectively reduced. The gravity filtration is, for example, filtration in which the liquid component is scraped off by a fine gap or the like, and is filtration in which solid component and liquid component are separated by gravity acting on the liquid component of the object to be treated. Moreover, expression filtration is filtration which squeezes out a liquid component from a processed material by pressurizing (pressing) a processed material.

  Further, in the solid-liquid separator according to the first aspect, preferably, the screw dewatering unit and the rotating body dewatering unit are integrally provided, and the screw dewatering unit is a rotating body dewatering unit disposed in a subsequent stage And a screw type dewatering unit discharge port for discharging the object directly.

  In the solid-liquid separator according to the first aspect, preferably, an aggregating agent supply unit for supplying an aggregating agent to an object to be treated which has been primarily dewatered by a screw dewatering unit is further provided. According to this structure, the material to be treated can be coagulated in the middle of the dehydration, and therefore, it can be easily separated into the solid component and the liquid component. As a result, the object can be dewatered more efficiently. In addition, since the coagulant is supplied to the object to be treated which has been subjected to primary dehydration by the coagulant supply unit, the object to be treated and the coagulant may be stirred by the rotating body of the rotary dehydrator to perform secondary dehydration. Can. For this reason, it is not necessary to provide separately the structure for stirring a to-be-processed object and a coagulant | flocculant, and it can suppress that an apparatus structure is complicated.

  Further, in the solid-liquid separator according to the first aspect, preferably, the screw dewatering unit includes a screw dewatering unit discharge port for discharging an object to be processed to the rotary body dewatering unit, and the screw dewatering unit discharge port The screw type dewatering unit is disposed at substantially the same height as the mixing tank outlet of the mixing tank for discharging the object to be treated. According to this structure, unlike in the case where the screw type dewatering portion discharge port is at a lower position than the mixing tank discharge port, the object to be treated flows out to the rotary type dewatering portion even when the primary dewatering is insufficient. Can be suppressed. Also, unlike the case where the screw type dewatering part discharge port is at a higher position than the mixing tank discharge port, the screw type dewatering part does not need to move the object to a higher position, so the load on the screw driving part It is possible to suppress the increase.

  In this case, preferably, the screw type dewatering unit includes a screw type dewatering unit supply port to which the object to be treated is supplied from the mixing tank, and the screw type dewatering unit has a screw type dewatering unit discharge port as a screw type dewatering unit supply port It is disposed to be inclined obliquely upward toward the rear-stage rotary dewatering portion so as to be positioned higher than the other. According to this structure, the object to be treated can be supplied from the mixing tank to the screw dewatering unit by overflowing, and the object to be treated can be easily supplied from the screw dewatering unit to the rotary dewatering unit by overflowing. .

  In the solid-liquid separator according to the first aspect, preferably, a storage unit for storing filtrate that has passed through the second filtration groove of the rotary dewatering unit is further provided, and the object stored in the storage unit is It is configured to be returned to the front stage of the screw type dewatering unit. According to this structure, the filtrate discharged from the rotary dewatering unit can be reliably treated by recycling it.

  In the solid-liquid separator according to the first aspect, preferably, a plurality of screw-type dewatering units are provided, and the plurality of screw-type dewatering units are arranged in parallel along the axial direction of the second rotation axis of the rotating-body-type dewatering unit. Is located in According to this structure, dewatering can be performed more efficiently by providing a plurality of screw type dewatering parts. Further, the object can be efficiently supplied to the rotary type dewatering unit which is relatively wider than the screw type dewatering unit by the screw type dewatering unit.

  In the solid-liquid separator according to the first aspect, preferably, the screw is rotated at a rotational speed of at least 1 rotation per minute, and the rotating body is rotated at a rotational speed of 0.5 rotations per minute or more. It is done. According to this structure, the primary dewatering can be efficiently performed by rotating the screw at a rotational speed of 1 revolution or more per minute or more. Further, secondary rotation can be performed efficiently by rotating the rotating body at a rotational speed of 0.5 revolutions per minute or more.

  A solid-liquid separation system according to a second aspect of the present invention includes a screw having a first rotation shaft, which feeds an object to be treated according to the rotation of the first rotation shaft, and is arranged to surround the screw. (1) A screw type dewatering portion that performs primary dewatering of the object including a laminated filter body in which a filtration groove is formed, and is disposed along the axial direction of the second rotation shaft and the second rotation shaft, (2) A plurality of rotary bodies arranged in upper and lower two rows, having a laminated rotary filter body in which filtration grooves are formed, including a plurality of rotary bodies arranged in the upper and lower rows A rotary body dewatering unit that performs secondary dewatering of an object to be treated and an object to be treated are supplied, and solid components of the supplied object to be treated are aggregated and flocculated, and the object to be treated is supplied to a screw type dewatering unit Mixing screw, and the screw dewatering part and the rotating body dewatering part After gravity filtration is performed in the screw dewatering unit by rotating the screw at a rotational speed faster than that of the rotating body, compression filtration in the rotary dewatering unit is performed rather than gravity filtration in the screw dewatering unit. It is configured to take time.

  In the solid-liquid separation system according to the second aspect of the present invention, as described above, the screw type dewatering unit for carrying out the primary dewatering of the object to be treated including the screw to feed the object to be treated; A rotary dewatering unit is disposed downstream of the dewatering unit and performs secondary dewatering of the object to be treated. As a result, since the screw-type dewatering portion and the rotary-type dewatering portion can perform dewatering in two steps, as compared with the conventional case where the dewatering is performed in one step only by the rotary-type dewatering portion, rotation of the screw is achieved. And even if the rotation of the rotating body is accelerated, the moisture content of the object to be treated can be lowered. Therefore, the solid-liquid separation device can efficiently discharge the object while reducing the moisture content of the object. Moreover, compared with the case where a screw type dewatering part and a rotating body type dewatering part are separated, it is necessary to provide a transfer facility of an object to be treated such as piping provided between the screw type dewatering part and the rotating body type dewatering part. The device configuration can be simplified because there is no Here, in general, the squeeze filtration performed on an object to be treated containing more solid content than the object to be treated by gravity filtration takes more time than the gravity filtration. Therefore, gravity filtration is performed in the screw dewatering unit by providing a rotating dewatering unit downstream of the screw dewatering unit and rotating the screw of the screw dewatering unit at a rotational speed faster than the rotating body of the rotating dewatering unit. After that, the pressure filtration in the rotary dewatering unit can be performed by taking longer than gravity filtration in the screw dewatering unit. As a result, the water content of the object to be treated can be effectively reduced. The gravity filtration is, for example, filtration in which the liquid component is scraped off by a fine gap or the like, and is filtration in which solid component and liquid component are separated by gravity acting on the liquid component of the object to be treated. Moreover, expression filtration is filtration which squeezes out a liquid component from a processed material by pressurizing (pressing) a processed material.

  According to the present invention, as described above, it is possible to provide a solid-liquid separation device and a solid-liquid separation system capable of efficiently discharging the object while lowering the moisture content of the object.

It is the schematic which showed the solid-liquid separation system provided with the solid-liquid separation apparatus by one Embodiment of this invention. It is a principal part enlarged view of a screw type dewatering part by one embodiment of the present invention. It is the top view which showed the screw type dewatering part and rotary-body-type dewatering part by one Embodiment of this invention. FIG. 6 is a side cross-sectional view of a dewatering unit according to an embodiment of the present invention; FIG. 6 is a side view of a dewatering unit according to an embodiment of the present invention; FIG. 6 is a cross-sectional view taken along line 400-400 of FIG. 5; It is the enlarged plan view which showed the adjacent state of the lamination | stacking rotary filter body of the rotary-body-type spin-drying | dehydration part by one Embodiment of this invention. It is an expanded side view of the lamination-like rotary filter of the rotary-body-type dewatering part by one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

First Embodiment
(Configuration of solid-liquid separation system)
One embodiment of the present invention will be described with reference to FIGS. 1 to 8. A solid-liquid separation system 100 according to an embodiment of the present invention includes a solid-liquid separation device 100a and an aggregation unit 100b, as shown in FIG.

  The solid-liquid separation system 100 receives an object to be treated such as sludge from an external object storage tank T and separates the object by a plurality of times (three times) by supplying a coagulant and stirring. It is configured to In addition, the solid-liquid separation system 100 is configured to obtain (discharge) an object to be treated (dehydrated cake) having a small water content by performing a two-stage dehydration process on the aggregated object to be treated There is. In detail, the solid-liquid separation system 100 is mainly configured to perform primary dehydration by gravity filtration in a screw type dewatering unit 2 described later. Thereafter, the solid-liquid separation system 100 is configured to perform secondary dehydration mainly by squeezing filtration in a rotary dewatering unit 3 (described later) disposed downstream of the screw dewatering unit 2. Details will be described later. The gravity filtration is, for example, filtration in which the liquid component is scraped off by a fine gap or the like, and is filtration in which solid component and liquid component are separated by gravity acting on the liquid component of the object to be treated. Moreover, expression filtration is filtration which squeezes out a liquid component from a processed material by pressurizing (pressing) a processed material.

(Configuration of solid-liquid separation device)
Next, the configuration of the solid-liquid separation device will be described with reference to FIGS.

  As shown in FIG. 1, the solid-liquid separator 100 a includes a tank (service tank) 1, a screw-type dewatering unit 2, a rotating-type dewatering unit 3, a reservoir coagulant supply unit 4, and a rotating-body coagulant supply And 5 are provided. In addition, the screw type dewatering part 2 is comprised so that the comparatively clear filtrate discharged | emitted by the apparatus exterior and a to-be-processed object may be performed by primary dehydrating a to-be-processed object. The rotary dewatering unit 3 performs a second dewatering of the object to be treated which has been subjected to the primary dewatering by the screw dewatering unit 2 so that the relatively dirty filtrate stored in the tank 1 and the object to be discharged to the outside of the apparatus It is comprised so that a processed material (dehydrated cake) may be separated. The rotating body coagulant supply unit 5 is an example of the “flocculant supply unit” in the claims.

  The tank 1 integrally includes a reservoir 10 and a filtrate receiver 11. The storage unit 10 and the filtrate receiving unit 11 are configured to overlap each other in plan view (as viewed from above). Further, the tank 1 is provided with a side plate 1 a disposed between the screw dewatering unit 2 and the rotary dewatering unit 3. The storage portion 10 and the filtrate receiving portion 11 are provided separately by the side plate 1 a. That is, the storage unit 10 and the filtrate receiving unit 11 are configured such that direct transfer of the processing object is not performed. Further, in the tank 1, a screw type dewatering unit 2 and a rotating body type dewatering unit 3 are installed. Therefore, the screw-type dewatering unit 2 and the rotary-type dewatering unit 3 are integrally provided via the tank 1.

  The storage unit 10 is configured to receive an object to be processed from the object storage tank T and store the object to be processed. Moreover, the storage part 10 is comprised so that the filtrate which passed 2nd filtration groove | channel S2 which the rotary-body-type spin-drying | dehydration part 3 mentioned later may be stored. That is, the storage unit 10 is configured to store the filtrate (the liquid component of the object to be treated) obtained by secondary dehydration (dehydration mainly by squeezing filtration) in the rotary body dehydration unit 3.

  In the storage unit 10, an agitation pump 10a and a supply pump 10b are provided. Stirring pump 10 a includes an object to be treated supplied from object to be treated storage tank T and screw type dewatering unit 2 to storage unit 10, and an inorganic flocculant supplied to storage unit 10 from storage unit coagulant supply unit 4. By stirring, the substance to be treated is aggregated (the concentration of the solid component (floc) is increased). Further, the supply pump 10 b is configured to supply (return) the material to be treated that is stored in the storage unit 10 and is aggregated to the front stage (aggregation unit 100 b) of the screw type dewatering unit 2.

  The filtrate receiving unit 11 is configured to receive a filtrate that has passed through a first filtration groove S1 described later of the screw type dewatering unit 2. That is, the filtrate receiving unit 11 is configured to receive the filtrate (processed material) obtained by primary dehydration (dewatering mainly by gravity filtration) in the screw type dewatering unit 2. Further, the filtrate receiving portion 11 is provided with a filtrate discharge port 11 a. The filtrate receiver 11 is inclined in an oblique direction toward the filtrate outlet 11 a so that the filtrate outlet 11 a side is lower.

  The screw-type dewatering unit 2 discharges the object to be processed to the screw-type dewatering unit supply port 20 to which the object to be treated is supplied from the aggregation unit 100 b (mixing tank 6 described later) And a screw type dewatering portion discharge port 21. The screw-type dewatering unit 2 is disposed obliquely upward toward the rotor-type dewatering unit 3 in the subsequent stage so that the screw-type dewatering unit discharge port 21 is positioned above the screw-type dewatering unit supply port 20 There is. That is, in the screw dewatering unit 2, the side closer to the rotary dewatering unit 3 is positioned above the side away from the rotary dewatering unit 3.

  The screw type dewatering unit 2 includes a screw 22, a laminated filter body 23 having a plurality of movable plates 23a (see FIG. 3) and a plurality of fixed plates 23b (see FIG. 3), a first motor 24, and an outer frame 25. And a back pressure plate 26. The movable plate 23a and the fixed plate 23b have a ring shape.

  The screw 22 has a first rotation shaft 22a. The screw 22 is configured to rotate as the first motor 24 rotates. In addition, the screw 22 is configured to feed an object supplied from the screw dewatering unit supply port 20 to the rotary dewatering unit 3 with the rotation of the first rotation shaft 22a. The laminated filter body 23 (the movable plate 23a and the fixed plate 23b) has a first hole 230 through which the screw 22 is inserted, as shown in FIG. In addition, the laminated filter body 23 has a multi-plate structure in which the movable plate 23 a and the fixed plate 23 b are alternately stacked in a state where the screw 22 is inserted into the first hole 230 so as to surround the screw 22. ing.

  Further, the plurality of fixing plates 23b have second holes 231a (screw holes) in which the spacers 231b are screwed one by one, in addition to the first holes 230 through which the screws 22 are inserted. . Then, the spacer 231b is screwed into the second hole portion 231a, so that the fixing plate 23b is configured to maintain the distance to another adjacent fixing plate 23b at a predetermined distance. Thereby, 1st filtration groove | channel S1 is formed between each stationary plate 23b. Moreover, the drainage water flow-out groove | channel G1 is formed in the part except the movable plate 23a of 1st filtration groove | channel S1 between the adjacent fixed plates 23b.

  The outer frame 25 is configured to fix a plurality of fixing plates 23b. In detail, the outer frame 25 is disposed in contact with the outer peripheral end of the plurality of fixing plates 23b. The outer frame 25 extends along the axial direction of the first rotation shaft 22a. Further, a plurality (for example, three) of the contact portions of the outer frame 25 to the fixing plate 23b are provided at equal intervals in the circumferential direction of the fixing plate 23b (only one contact portion is shown in FIG. 2). The plurality of fixed plates 23 b are configured to be fixed to the outer frame 25 so as to maintain the stacked state with the movable plate 23 a. In the movable plate 23a, the inner peripheral surface constituting the first hole portion 230 abuts on the outer peripheral portion of the screw 22, and along the rotation of the screw 22, the circumferential direction and radial direction of the first rotation shaft 22a of the screw 22 It is configured to be constantly moved. As described above, the screw type dewatering unit 2 can prevent the first filtration groove S1 from being clogged by constantly moving the movable plate 23a in the first filtration groove S1 by the rotation of the screw 22. .

  Here, with reference to FIG. 1 and FIG. 2, the structure which carries out primary dewatering of screw type dewatering part 2 is explained with the procedure of primary dewatering. As shown in FIG. 1, when an object to be treated is supplied to a screw type dewatering portion supply port 20 provided near the lower end, the screw type dewatering portion 2 screws the object to be treated by rotation of the screw 22. It is comprised so that it may push up diagonally upward toward the type | formula dewatering part discharge port 21 (rotary body dewatering part 3 side). Thereby, the screw type dewatering unit 2 is configured to feed the object to be treated. Further, as shown in FIG. 2, the screw type dewatering unit 2 discharges the filtrate from the first filtration groove S1 to the filtrate receiving unit 11 by rotating the screw 22 and moving the movable plate 23 a. It is configured. In addition, as shown in FIG. 1, the screw type dewatering unit 2 is configured to be able to pressurize the object to be processed sent by the screw 22 by the back pressure plate 26. Specifically, the back pressure plate 26 is configured to be able to adjust the position in the axial direction of the first rotation shaft, and is discharged by adjusting the path width of the object toward the screw type dewatering portion discharge port 21. It is possible to pressurize the object immediately before. However, the screw type dewatering unit 2 is usually adjusted so that the path width becomes wide so as not to press the object to be treated by the back pressure plate 26. The back pressure plate 26 is adjusted so as to press the object to be treated as necessary so that the gravity filtration is substantially completed in the screw dewatering unit 2.

  As shown in FIG. 3, a plurality of (two) screw type dewatering units 2 are provided. Further, the plurality of screw type dewatering units 2 are arranged in parallel and in parallel along the axial direction (direction A) of the second rotation shaft 30 b described later of the rotary type dewatering unit 3.

  As shown in FIG. 4, the rotary type dewatering unit 3 includes a plurality of rotating bodies 30, a plurality of second motors 31 (see FIG. 5), a sealing member 32, a sludge scraping plate 33, and a discharge chute 34. Is equipped.

  The rotary body 30 includes a laminated rotary filter body 30a and a second rotary shaft 30b.

  A plurality of stacked rotary filters 30a are disposed in two rows, upper and lower, toward the solid discharge port E so as to send the object to be processed to the solid discharge port E. Also, the lower row of six (four in the upper row) laminated rotary filters 30a are arranged at a predetermined interval, and are configured to send the object by rotating in the same direction. It is done.

  The laminated rotary filter body 30a, as shown in FIG. 6, includes a plurality of filter pieces laminated along the second rotary shaft 30b. Specifically, as shown in FIGS. 7 and 8, the laminated rotary filter body 30a includes a plurality of medium diameter disc filter pieces 300, a plurality of small diameter disc filter pieces 301, and a plurality of large diameter disc filter pieces. It contains three 302 pieces of filter. The second rotation shaft 30 b is arranged to extend in the A direction. In the second rotary shaft 30b, the large diameter disc filter pieces 302 and the small diameter disc filter pieces 301 are alternately arranged between the adjacent medium diameter disc filter pieces 300, and the filter pieces are stacked.

  Further, between the adjacent medium-diameter disc filter pieces 300, a second filtration groove S2 is formed. Specifically, the medium diameter disc filter piece 300 is provided with a convex portion 300 a that abuts on another medium diameter disc filter piece 300 adjacent in the axial direction (Y direction). Then, the second filtration groove S2 is formed between the medium diameter disc filter pieces 300 separated by the convex portion 300a. As shown in FIG. 8, the convex portion 300 a is configured to be inserted into the notch portion 301 a of the small diameter disc filter piece 301 or the hole (not shown) of the large diameter disc filter piece 302.

  The small diameter disc filter piece 301 is, as shown in FIG. 8, arranged swingably in the second filtration groove S2 between the adjacent medium diameter disc filter pieces 300. As shown in FIG. Further, in the portion of the second filtration groove S2 between the adjacent medium-diameter disk filter pieces 300 excluding the small-diameter disk filter piece 301, a filtrate water discharge groove G2 is formed. The large diameter disc filter pieces 302 are arranged swingably in the second filtration grooves S2 between the adjacent medium diameter disc filter pieces 300. In addition, in the portion of the second filtration groove S2 between the adjacent medium-diameter disk filter pieces 300 except the large-diameter disk filter piece 302, a drainage water discharge groove G2 is formed. The liquid component in the undiluted solution is filtered through these filtrate water discharge grooves G2.

  Further, as shown in FIG. 7, the large-diameter disc filter piece 302 swings into the second filtration groove S2 of the laminated rotary filter body 30a adjacent to the solid component feeding direction (direction orthogonal to the A direction). It is arranged as possible. According to this structure, clogging of the second filtration groove S2 due to the swing of the large diameter disc filter piece 302 and the small diameter disc filter piece 301 can be suppressed.

  As shown in FIGS. 5 and 6, the second motor 31 is provided at one end of each of the plurality of laminated rotary filters 30a in the axial direction (direction A) of the second rotary shaft 30b. In addition, the second motor 31 is provided for each of the plurality (ten) of laminated rotary filters 30 a (each of the rotary bodies 30). As shown in FIGS. 5 and 6, a plurality of (ten) second motors 31 may be disposed only on one side in the axial direction (direction A), or may be disposed on both sides in the axial direction. It is also good. When a plurality of (10) second motors 31 are disposed on both sides in the axial direction, the plurality (10) second motors 31 are alternately disposed on one side and the other side in the axial direction. preferable.

  The second motor 31 is configured to rotate the rotating body 30 at a rotational speed of 0.5 revolutions per minute or more. The first motor 24 of the screw type dewatering unit 2 is configured to rotate the screw 22 at a rotational speed of one or more revolutions per minute. In addition, the screw 22 is configured to rotate at a speed faster than that of the rotating body 30. More preferably, the second motor 31 is configured to rotate the rotating body 30 at a rotational speed of at least one rotation per minute, and the first motor 24 is at a rotational speed of at least three rotations per minute. It is desirable to configure for rotation. In addition, it is desirable that the rotational speed of the screw 22 be adjusted so that gravity filtration is substantially completed in the screw dewatering unit 2.

  As shown in FIG. 1, one seal member 32 is disposed between the side plate 1 a that divides the screw dewatering portion 2 of the tank 1 and the rotary body dewatering portion 3 from the uppermost stream rotating body 30 in the lower row There is. Thereby, the sealing member 32 seals so that a to-be-processed object may not pass to the storage part 10 side from the screw-type dewatering part supply port 20 side.

  The sludge scraping plates 33 are provided respectively on the lowermost downstream rotating body 30 in the lower row and on the lowermost downstream rotating body 30 in the upper row, and are clogged between the laminated rotating filters 30a of the rotating body 30 It is configured to scrape and remove solids.

  As shown in FIG. 1, the discharge chute 34 is provided at the solid discharge port E, and constitutes a discharge path of the discharge discharged from the rotary dehydrator 3. Further, the discharge chute 34 includes a pair of lateral plates 34a (only one lateral plate 34a in the A direction is shown in FIG. 1) opposed in the axial direction (Y direction), and a bottom plate 34b.

  The storage unit coagulant supply unit 4 is configured to supply the inorganic coagulant to the processing object supplied to the storage unit 10. In addition, the rotating body coagulant supply unit 5 is configured to supply the polymer coagulant to the object to be treated which has been primarily dewatered by the screw type dewatering unit 2. More specifically, the rotating body coagulant supply unit 5 is the uppermost stream of rotating bodies in the lower row of the rotating dewatering unit 3 with respect to the object discharged from the screw dewatering unit outlet 21 of the screw dewatering unit 2. It is configured to be fed from above 30. The polymer flocculant supplied to the rotary type dewatering unit 3 by the rotary unit coagulant supply unit 5 is stirred with the object to be treated by the rotary unit 30.

(Structure of aggregation part)
Next, the configuration of the aggregation unit 100b will be described with reference to FIG.

  The aggregation unit 100 b includes a mixing tank 6, a mixing tank coagulant supply unit 7, and an impeller 8. The mixing tank 6 is configured to be supplied with an object to be treated from the reservoir 10 of the solid-liquid separator 100a. Further, the mixing tank 6 includes a mixing tank outlet 6 a for discharging the object to be treated to the screw type dewatering unit 2. The mixing tank discharge port 6a and the screw type dewatering portion discharge port 21 are disposed at substantially the same height position as indicated by a two-dot chain line extending in the horizontal direction. The mixing tank coagulant supply unit 7 is configured to supply a polymer coagulant to the mixing tank 6. The impeller 8 is disposed in the mixing tank 6. Further, the impeller 8 is provided with a third motor 8a as a drive source. The impeller 8 is configured to coagulate the processing object (increase the concentration of the solid component (flock)) by agitating the object to be treated supplied to the mixing tank 6 and the after the polymer flocculant. There is.

(Effect of the embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as described above, the screw type dewatering unit 2 that includes the screw 22 for feeding the material to be treated and performs primary dewatering of the material to be treated, and the rotating body 30. A rotary body dewatering unit 3 is provided, which is disposed and performs secondary dehydration of the object to be treated. As a result, since the screw-type dewatering unit 2 and the rotary-type dewatering unit 3 can perform dewatering in two steps, as compared with the conventional case where the dewatering is performed in one step only by the rotary-type dewatering unit 3. Even if the rotation of the screw 22 and the rotation of the rotating body 30 are made faster, the moisture content of the object to be treated can be lowered. Therefore, the solid-liquid separation device 100a can discharge the object to be processed efficiently while lowering the moisture content of the object to be treated. Here, in general, the squeeze filtration performed on an object to be treated containing more solid content than the object to be treated by gravity filtration takes more time than the gravity filtration. Therefore, the screw type dewatering unit 2 is provided at the rear stage of the screw type dewatering unit 2 and the screw 22 of the screw type dewatering unit 2 is rotated at a rotational speed faster than the rotating body 30 of the rotary type dewatering unit 3 After gravity filtration is performed in the part 2, compression filtration in the rotary dewatering unit 3 can be performed by taking longer than gravity filtration in the screw dewatering unit 2. As a result, the water content of the object to be treated can be effectively reduced.

  Further, in the present embodiment, as described above, the screw dewatering unit 2 and the rotary body dewatering unit 3 are integrally provided. Thereby, compared with the case where the screw type dewatering unit 2 and the rotary body type dewatering unit 3 are separated, an object to be treated such as piping provided between the screw type dewatering unit 2 and the rotary body type dewatering unit 3 Since there is no need to provide a transfer facility, the apparatus configuration can be simplified.

  Further, in the present embodiment, as described above, the rotating body coagulant supply unit 5 for supplying the coagulant to the object to be treated which has been primarily dewatered by the screw type dewatering unit 2 is provided. As a result, since the material to be treated can be coagulated in the middle of dehydration by the rotating body coagulant supply part 5, it is possible to easily separate it into solid and liquid components. As a result, the object can be dewatered more efficiently. In addition, since the coagulant is supplied to the object to be treated which has been subjected to primary dehydration by the rotary coagulant supply unit 5, the object to be treated and the coagulant are provided by the rotary body 30 of the rotary dewatering unit 3 which performs secondary dehydration. And can be stirred. For this reason, it is not necessary to provide separately the structure for stirring a to-be-processed object and a coagulant | flocculant, and it can suppress that an apparatus structure is complicated.

  Moreover, in the present embodiment, as described above, the screw dewatering unit 2 is provided with the screw type dewatering unit discharge port 21 for discharging the object to be processed in the rotary body dewatering unit 3. The screw type dewatering unit 2 is disposed at substantially the same height position as the mixing tank outlet 6 a of the mixing tank 6 for discharging the object to be treated. Thus, unlike the case where the screw type dewatering part discharge port 21 is at a lower position than the mixing tank discharge port 6a, the object to be treated flows out to the rotary type dewatering part 3 even if the primary dewatering is insufficient. Can be suppressed. In addition, unlike the case where the screw type dewatering part discharge port 21 is at a position higher than the mixing tank discharge port 6a, the screw type dewatering part 2 does not have to move the object to a higher position. It is possible to suppress an increase in part load.

  Further, in the present embodiment, as described above, the screw type dewatering unit 2 is provided with the screw type dewatering unit supply port 20 to which the object to be treated is supplied from the mixing tank 6. In order to position the part discharge port 21 above the screw type dewatering part supply port 20, the part discharge port 21 is inclined obliquely upward toward the rotating body type dewatering part 3 in the latter stage. Thereby, the object to be treated can be supplied from the mixing tank 6 to the screw dewatering unit 2 by overflow, and the object to be treated can be easily supplied from the screw dewatering unit 2 to the rotary dewatering unit 3 by overflowing. .

  Further, in the present embodiment, as described above, the filtrate receiving unit 11 for receiving the filtrate passing through the first filtration groove S1 of the screw type dewatering unit 2 and the filtrate receiving unit 11 are provided separately, and the rotating body type is provided. There is provided a tank 1 integrally including a storage portion 10 for storing filtrate that has passed through the second filtration groove S 2 of the dewatering portion 3, and an object stored in the storage portion 10 is a screw type dewatering portion 2. It is configured to be returned to the previous stage. Thereby, an apparatus structure can be simplified rather than the case where the filtrate receiving part 11 and the storage part 10 are made into another body. Further, the filtrate discharged from the rotary type dewatering unit 3 can be reliably treated by recycling it.

  In the present embodiment, as described above, a plurality of screw-type dewatering units 2 are provided, and the plurality of screw-type dewatering units 2 are arranged in parallel along the axial direction of the second rotation shaft 30b of the rotary-type dewatering unit 3 . Thereby, dewatering can be performed more efficiently by providing multiple screw type dewatering parts 2. Further, the object to be treated can be efficiently supplied to the rotary type dewatering unit 3 which is relatively wider than the screw type dewatering unit 2 by the screw type dewatering unit 2.

  Further, in the present embodiment, as described above, the screw 22 is rotated at a rotational speed of 1 revolution or more per minute, and the rotating body 30 is rotated at a rotational speed of 0.5 revolutions per minute or more. As a result, the screw 22 can be rotated at a rotational speed of at least one revolution per minute to perform primary dewatering efficiently. Further, secondary spin-off can be performed efficiently by rotating the rotating body 30 at a rotational speed of 0.5 revolutions per minute or more.

(Modification)
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the description of the embodiments described above but by the claims, and further includes all modifications (modifications) within the meaning and scope equivalent to the claims.

  For example, although the example which provided two screw-type spin-drying | dehydration parts was shown in said one embodiment, this invention is not limited to this. In the present invention, one or three or more screw dewatering parts may be provided.

  Moreover, although the example which arrange | positioned several screw type spin-drying | dehydration parts in parallel was shown in the said one Embodiment, this invention is not limited to this. In the present invention, for example, the plurality of screw type dewatering parts may be arranged not to be parallel but to have a predetermined angle with each other.

  In the above embodiment, the screw is rotated at a rotational speed of at least one revolution per minute, and the rotating body is rotated at a rotational speed of at least 0.5 revolutions per minute. Not limited to. In the present invention, the screw may be rotated at a rotational speed of less than one rotation per minute, and the rotating body may be rotated at a rotational speed of less than 0.5 rotations per minute.

  Moreover, although the example which provided the screw-type spin-drying | dehydration part and the rotary-body-type spin-drying | dehydration part integrally was shown in the said one Embodiment, this invention is not limited to this. In the present invention, the screw dewatering portion and the rotary body dewatering portion may be provided separately.

  Moreover, in the said one Embodiment, although the example which arrange | positioned the screw-type spin-drying | dehydration part discharge port and the mixing tank discharge port to the substantially same height position was shown, this invention is not limited to this. In the present invention, the screw dewatering portion discharge port and the mixing tank discharge port may be disposed at different height positions.

  Moreover, in the said one Embodiment, although the example which a solid-liquid separation apparatus equips with a tank was shown, this invention is not limited to this. In the present invention, the solid-liquid separation device may not have the tank.

  Further, in the above-described embodiment, the screw dewatering unit is inclined obliquely upward toward the subsequent rotary dewatering unit such that the screw dewatering unit discharge port is positioned above the screw dewatering unit supply port. Although the example which is arranged is shown, the present invention is not limited to this. In the present invention, for example, the screw dewatering portion is disposed horizontally, or the like, so that the screw dewatering portion discharge port is positioned above the screw dewatering portion supply port, diagonally toward the rotating body dewatering portion in the latter stage. It does not have to be inclined upward.

2 screw-type dewatering part 3 rotating-body-type dewatering part 5 rotating-body coagulant supply part (flocculant supply part)
DESCRIPTION OF SYMBOLS 6 mixing tank 6a mixing tank discharge port 10 storage part 20 screw-type dewatering part supply port 21 screw-type dewatering part discharge port 22 screw 22a 1st rotating shaft 23 laminated filter body 30 rotating body 30a laminated rotating filter body 30b 2nd rotation Shaft 100 solid-liquid separation system 100a solid-liquid separation device

Claims (9)

A screw having a first rotation shaft, which feeds the to-be-treated object supplied according to the rotation of the first rotation shaft, and a laminated filter body disposed so as to surround the screw and having a first filtration groove formed therein A screw-type dewatering unit for performing primary dewatering of the object,
It includes a plurality of rotating bodies arranged in upper and lower two rows, having a second rotating shaft, and a laminated rotating filter body arranged along the axial direction of the second rotating shaft and in which a second filtration groove is formed. A rotary dewatering unit disposed downstream of the screw dewatering unit and performing secondary dewatering of the object dewatered by the screw dewatering unit;
After gravity filtration is performed in the screw dewatering unit by rotating the screw at a rotational speed faster than the rotating body, compression filtration in the rotor dewatering unit is performed rather than gravity filtration in the screw dewatering unit. A solid-liquid separation device that is configured to take time. The screw dewatering portion and the rotating body dewatering portion are integrally provided,
The solid-liquid separator according to claim 1, wherein the screw-type dewatering unit includes a screw-type dewatering unit discharge port for directly discharging an object to the rotary-type dewatering unit disposed in a subsequent stage.   The solid-liquid separator according to claim 1, further comprising a coagulant supply unit that supplies a coagulant to the object to be treated that has been primarily dewatered by the screw dewatering unit. The screw type dewatering unit includes a screw type dewatering unit discharge port for discharging the object to be processed to the rotating body type dewatering unit,
The screw type dewatering part discharge port is disposed at substantially the same height position as the mixing tank discharge port of the mixing tank that discharges the processing object to the screw type dewatering part. Solid-liquid separation device as described in. The screw type dewatering unit includes a screw type dewatering unit supply port to which an object to be treated is supplied from the mixing tank,
The screw dewatering unit is disposed obliquely toward the rotary dewatering unit at a later stage so that the screw dewatering unit discharge port is positioned above the screw dewatering unit supply port. The solid-liquid separation device according to claim 4. The storage device is further provided with a storage unit for storing filtrate that has passed through the second filtration groove of the rotary dewatering unit,
The solid-liquid separation device according to any one of claims 1 to 5, wherein the object stored in the storage section is configured to be returned to the front stage of the screw dewatering section. A plurality of screw type dewatering parts are provided,
The solid-liquid separation device according to any one of claims 1 to 6, wherein the plurality of screw-type dewatering units are arranged in parallel along the axial direction of the second rotation shaft of the rotary-type dewatering unit. .   The screw according to any one of claims 1 to 7, wherein the screw is rotated at a rotational speed of at least one rotation per minute, and the rotating body is rotated at a rotational speed of at least 0.5 rotation per minute. Solid-liquid separation device as described in. A screw having a first rotation shaft, which feeds the to-be-treated object supplied according to the rotation of the first rotation shaft, and a laminated filter body disposed so as to surround the screw and having a first filtration groove formed therein A screw-type dewatering unit for performing primary dewatering of the object,
It includes a plurality of rotating bodies arranged in upper and lower two rows, having a second rotating shaft, and a laminated rotating filter body arranged along the axial direction of the second rotating shaft and in which a second filtration groove is formed. A rotary dewatering unit disposed downstream of the screw dewatering unit and performing secondary dewatering of the object dewatered by the screw dewatering unit;
An object to be treated is supplied, and solid components of the supplied object to be treated are aggregated and flocculated, and a mixing tank for supplying the object to be treated to the screw type dewatering unit is provided.
The screw type dewatering portion and the rotating body type dewatering portion are integrally configured;
After gravity filtration is performed in the screw dewatering unit by rotating the screw at a rotational speed faster than the rotating body, compression filtration in the rotor dewatering unit is performed rather than gravity filtration in the screw dewatering unit. A solid-liquid separation system that is configured to run over time.

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