JP2020055019A - Screw type separation device and wastewater treatment system - Google Patents

Abstract

To suppress reduction in separation efficiency of an object.SOLUTION: A screw type separation device 1 includes a separation liquid discharge port 32C, an object discharge port 32 B, a cylindrical casing 10 having an object charge port 32A provided between the separation liquid discharge port 32C and the object discharge port 32B, a screw shaft 12 which is provided inside the casing 10 and extends in an extension direction E, and a screw blade part 14 which spirally extends to an outer peripheral surface of the screw shaft 12 and has a pitch of a transportation promotion section KA including a portion overlapping the object charge port 32A when viewed from a radial direction of the casing 10 shorter than a pitch of an object transportation section KB; and rotates the screw shaft 12 and thereby dehydrates the object while moving it to the object discharge port 32B through the transportation promotion section KA and the object transportation section KB, and discharges the dehydrated object A from the object discharge port 32B and discharges a separation liquid C from the separation liquid discharge port 32C.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a screw-type separation device and a wastewater treatment system.

  Conventionally, centrifugal methods, flotation concentration methods, screen concentration dehydration methods, and the like can be given as methods that have been employed in so-called separation devices such as concentrators and dehydrators. Also, sludge such as sewage or industrial wastewater having a high water content as an object to be treated is introduced into a cylindrical filter body, and a screw provided inside the filter body is rotated to convey the object to be treated. In addition, a screw press dewatering device for filtering and dewatering is used. In a screw press dewatering apparatus, a cylindrical screen formed of a mesh or a punching plate having a large number of holes (filtration holes) formed on an outer peripheral surface thereof is used as a filter for filtering and dewatering an object to be treated such as sludge. It is generally used (see Patent Document 1).

JP-A-8-309589

  However, in the dehydrating apparatus employing the above-described dehydrating and concentrating method, both the equipment cost and the periodic inspection cost are increased, and the cost is increased. Specifically, the power consumption increases in the centrifugal method, the site area increases in the floating concentration method, and a large amount of washing water is required in the screen concentration / dehydration method. Therefore, there is a demand for a separation device in which running costs such as equipment costs and periodic inspection costs are reduced.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a screw-type separation device and a wastewater treatment system that can efficiently separate a liquid component from a treatment target including a liquid and that can be maintained and managed at low cost. Aim.

  In order to solve the above-described problems and achieve the object, a screw-type separation device according to the present disclosure is provided with a separated liquid discharge port that is provided at one end and discharges a separated liquid separated from an object by dehydration, and the other. An object outlet provided at an end of the object for discharging the dehydrated object, and an object inlet provided between the separated liquid outlet and the object outlet to which the object is charged A cylindrical caging having: a screw shaft provided inside the caging and extending along an extending direction that is a direction from the one end to the other end; and an outer periphery of the screw shaft. The pitch of the transport promotion section that extends spirally on the surface and includes a portion that overlaps the object input port when viewed from the radial direction of the caging, the section on the object discharge port side with respect to the transport promotion section. Of the object transport section A shorter screw blade portion, and rotating the screw shaft to allow the target object input from the target object insertion port to pass through the transfer promotion section and the target object transfer section, thereby obtaining the target object. The dewatered object is discharged from the object discharge port, and the separated liquid is discharged from the separated liquid discharge port.

  The screw blade portion extends spirally on the outer peripheral surface of the screw shaft, includes a plurality of screw blades provided at predetermined intervals along the extending direction, and includes a plurality of screw blades in the transport promotion section. It is preferable that the number of screw blades is larger than the number of screw blades in the object transport section.

  In the screw blade portion, it is preferable that a pitch of the transport promoting section is shorter than a pitch of a separated liquid transport section that is a section on the separated liquid discharge port side with respect to the transport promoting section.

  The screw blade portion extends spirally on the outer peripheral surface of the screw shaft, has a plurality of screw blades provided at predetermined intervals along the extending direction, and has a plurality of screw blades. It is preferable that the number of the screw blades is larger than the number of the screw blades in the separation liquid transport section.

  It is arranged between the target object inlet and the separated liquid outlet in the extending direction, and is provided so as to overlap a part of a region formed between the screw blades adjacent in the extending direction. It is preferable to have a partition.

  The partition wall portion, among the regions formed between the screw blades adjacent to each other in the extending direction, overlaps a radially inner side region with respect to a radially outer tip portion of the screw blade, and the inner region. It is preferable to open an area outside in the radial direction.

  In order to solve the above-described problems and achieve the object, a screw-type separation device according to the present disclosure is provided with a separated liquid discharge port that is provided at one end and discharges a separated liquid separated from an object by dehydration, and the other. An object outlet provided at an end of the object for discharging the dehydrated object, and an object inlet provided between the separated liquid outlet and the object outlet to which the object is charged A cylindrical caging having: a screw shaft provided inside the caging and extending along an extending direction that is a direction from the one end to the other end; and an outer periphery of the screw shaft. A screw blade portion spirally extending on a surface, and disposed between the object input port and the separated liquid discharge port in the extending direction, and between the screw blades adjacent in the extending direction. Weight on the formed area And a partition portion provided so as to rotate the screw shaft, thereby dehydrating the target object input from the target object input port while moving the target object to the target object discharge port. The separated object is discharged from the target object outlet, and the separated liquid is discharged from the separated liquid outlet.

  In order to solve the above-described problems and achieve the object, a wastewater treatment system according to the present disclosure is a wastewater treatment system including a solid-liquid separation tank that separates sludge from organic wastewater, and the screw-type separation device. The screw-type separation device is configured to condense sludge discharged from the solid-liquid separation tank and return the separated liquid generated during the concentration of the sludge to the solid-liquid separation tank.

  The screw-type separation device is preferably provided in the solid-liquid separation tank.

  In order to solve the above-described problems and achieve the object, a wastewater treatment system according to the present disclosure includes a reaction tank that performs biological treatment on organic wastewater, and a solid-liquid separation tank that separates sludge from the organic wastewater. A wastewater treatment system comprising the screw-type separation device, wherein the screw-type separation device withdraws and concentrates sludge from the reaction tank, and returns the concentrated sludge to the reaction tank. The separation liquid generated when the sludge is concentrated can be supplied to the solid-liquid separation tank.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to isolate | separate a liquid component efficiently from the to-be-processed object containing a liquid, it becomes possible to maintain at low cost.

FIG. 1 is a partial cross-sectional view of the screw-type separation device according to the present embodiment. FIG. 2 is a partially enlarged view of a cross section of the screw-type separation device according to the present embodiment. FIG. 3 is a schematic diagram for explaining the operation of the screw-type separation device according to the present embodiment. FIG. 4 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. FIG. 5 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. FIG. 6 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. FIG. 7 is a configuration diagram illustrating a part of the wastewater treatment system according to the first embodiment. FIG. 8 is a schematic diagram illustrating a sedimentation basin for describing a modification of the first embodiment. FIG. 9 is a configuration diagram illustrating a part of the wastewater treatment system according to the second embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the embodiments described below.

(Structure of screw type separation device)
FIG. 1 is a partial cross-sectional view of the screw-type separation device according to the present embodiment. As shown in FIG. 1, the screw-type separation device 1 according to the present embodiment includes a caging 10, a screw shaft 12, a screw blade 14, a partition 20, a flow regulating tank 22, a charging unit 24, an inclination adjusting unit 25, and It has a control unit 26. The screw-type separation device 1 dehydrates the previous target A0 charged into the caging 10 from the target input port 32A described later, and discharges the dehydrated target A from the target discharge outlet 32B described later. . Then, the screw-type separation device 1 discharges the separated liquid C separated from the previous target object A0 by dehydration from a separated liquid discharge port 32C described later. The preceding object A0 is sludge such as sewage or industrial wastewater having a high water content. The target object A0 is a target object before being dewatered by the screw-type separation device 1, and in the present embodiment, is sludge having a high water content, such as sewage or factory wastewater. Furthermore, the preceding object A0 is a sludge to which a coagulant has been added, and is a sludge containing a solid component and moisture. In the present embodiment, the solid object component is flocculated by, for example, adding a flocculant by a device provided in the preceding stage of the screw type separation device 1, and the solid object containing the liquid component A0 Generate However, the property of the front target A0 is arbitrary, and for example, sludge that is not flocculated without adding a coagulant may be used.

  Hereinafter, a direction parallel to the ground surface G, that is, a horizontal direction is referred to as an X direction. Then, one direction of the X direction is defined as an X1 direction, and the other direction of the X direction, that is, a direction opposite to the X1 direction is defined as an X2 direction. A direction orthogonal to the X direction and also orthogonal to the ground surface G, that is, a vertical direction is defined as a Z direction. Then, one of the Z directions is defined as a Z1 direction, and the other of the Z directions, that is, a direction opposite to the Z1 direction is defined as a Z2 direction. The Z1 direction is a direction upward in the vertical direction, that is, a direction away from the ground surface G, and the Z2 direction is a direction downward in the vertical direction, that is, a direction toward the ground surface G side.

  As shown in FIG. 1, the caging 10 is a cylindrical member that extends from one end 30 </ b> C to the other end 30 </ b> B along the extending direction E and has a space provided therein. The caging 10 is a cylindrical member, and the diameter of the other end 30B is reduced. The diameter of the caging 10 where the diameter is not reduced is, for example, about 20 cm or more and 50 cm or less, but the size is arbitrary. The extending direction E is the axial direction of the casing 10. The extending direction E is inclined toward the Z2 direction with respect to the X1 direction from the one end 30C side toward the other end 30B side. That is, the caging 10 is inclined such that the center axis along the extending direction E moves (positions) in the Z2 direction as it moves toward the other end 30B (in the direction X1). Therefore, in the caging 10, the other end 30B is located on the Z2 direction side, that is, vertically below the one end 30C. In the caging 10, the inclination angle θ is preferably 20 ° or more and 90 ° or less, and more preferably 30 ° or more and 45 ° or less. The inclination angle θ is the inclination angle of the central axis along the extending direction E of the caging 10 with respect to the horizontal direction X (the ground surface G).

  The caging 10 has a separated liquid outlet 32C opened at one end 30C. The caging 10 has an object discharge port 32B opened at the other end 30B. The separated liquid discharge port 32C is an opening different from the hole through which the screw shaft 12 passes, and is provided on the direction Z2 side of the screw shaft 12. However, the separated liquid outlet 32C may be located on one end 30C side of the target object outlet 32B. The separated liquid discharge port 32C may be provided, for example, at the one end 30C on the direction Z1 side with respect to the screw shaft 12 and is provided at the same position as the screw shaft 12 so that the screw shaft 12 can penetrate inside. May be. Further, the separated liquid discharge port 32C may be provided, for example, on an outer peripheral surface (side surface) of the caging 10 in a separated liquid transport section KC described later. Further, the separated liquid outlet 32C may be located on the other end 30B side of the target object outlet 32B. In addition, the object discharge port 32B is located on the Z2 direction side, that is, below the vertical direction in relation to the separated liquid discharge port 32C. In this embodiment, although the screw shaft 12 can penetrate the inside of the target object outlet 32B, the screw shaft 12 may not be penetrated.

  Further, the caging 10 has an object input port 32A opened in the intermediate portion 30A. The intermediate portion 30A is a portion between one end 30C and the other end 30B along the extending direction E, in other words, the separated liquid outlet 32C along the extending direction E and the target object discharging portion 32C. This is a location between the outlet 32B. The intermediate portion 30A is located at the center of the caging 10 along the extending direction E, but at an arbitrary position between one end 30C and the other end 30B along the extending direction E. Good. For example, the length of the caging 10 along the extending direction E from one end portion 30C to the intermediate portion 30A is 30% or more and 70% or less with respect to the entire length of the caging 10 along the extending direction E. Is preferred. The target object inlet 32A is opened on the outer peripheral surface of the caging 10 at the position of the intermediate portion 30A.

  The caging 10 is a cylindrical member in which the target object inlet 32A, the target object outlet 32B, and the separated liquid outlet 32C are open. The caging 10 does not have a hole communicating between the inside and the outside except for the object inlet 32A, the object outlet 32B, and the separated liquid outlet 32C. An opening may be formed in addition to the outlet 32B and the separated liquid outlet 32C. However, unlike the screen such as a mesh and a punching plate, the caging 10 does not have a structure in which a large number of openings are formed over the entire area.

  The screw shaft 12 has a cylindrical shape, is provided inside the caging 10, and extends along the extending direction E. The screw shaft 12 is provided inside the casing 10 so as to penetrate the casing 10 along the extending direction E. That is, one end 12 </ b> C of the screw shaft 12 is located on one end 30 </ b> C side of the caging 10, and protrudes outside of the caging 10 from the one end 30 </ b> C of the caging 10. Similarly, the other end 12 </ b> B of the screw shaft 12 is located on the other end 30 </ b> B side of the caging 10, and protrudes outside the caging 10 from the other end 30 </ b> B of the caging 10. At least one of the one end 12C and the other end 12B of the screw shaft 12 is connected to a motor (both not shown) whose shaft is supported by a bearing. The screw shaft 12 is rotated in the direction D about the extending direction E as an axis by driving the motor by the control unit 26. In the present embodiment, the direction D is a counterclockwise direction when viewed from the one end 12C side, but is not limited thereto.

  The screw blade portion 14 is a member that spirally extends on the outer peripheral surface of the screw shaft 12 along the extending direction E inside the casing 10. In the present embodiment, the screw blade section 14 includes a plurality of screw blades. The screw blade portion 14 is configured such that the pitch is different for each section because the number of screw blades is different for each section along the extending direction E of the caging 10. Here, the pitch refers to a length between two adjacent screw blades in the extending direction E.

  In the present embodiment, the screw blade section 14 includes a first screw blade 16 and a second screw blade 18 as a plurality of screw blades. The first screw blade 16 spirally extends on the outer peripheral surface of the screw shaft 12 along the extending direction E inside the casing 10. The first screw blade 16 extends spirally from one end 16C to the other end 16B. One end 16C is a position where the winding of the first screw blade 16 is started, and is an end on one end 30C side (separated liquid discharge port 32C side) of the caging 10, that is, an end on the direction X2 side. Department. The other end 16B is a position where the winding of the first screw blade 16 ends, and the end of the caging 10 on the other end 30B side (the object discharge port 32B side), that is, the end on the direction X1 side. Department. Therefore, the first screw blade 16 extends from one end 16C to the other end 16B via a portion overlapping the target object inlet 32A when viewed from the radial direction with the extending direction E as the central axis. Exist.

  The first screw blade 16 is wound from one end 16C to the other end 16B in a direction opposite to the direction D which is the rotation direction of the screw shaft 12. That is, when the rotation direction (direction D) of the screw shaft 12 is counterclockwise as viewed from the one end 12C side, the first screw blade 16 has a so-called Z-winding (right-handed) spiral shape (spiral shape). Is provided. Conversely, when the rotation direction (direction D) of the screw shaft 12 is clockwise as viewed from the one end 12C side, the first screw blade 16 is provided in a so-called S-winding (left-handed) spiral shape. The first screw blade 16 rotates with the rotation of the screw shaft 12. The pitch P1 of the first screw blades 16, that is, the distance between the adjacent first screw blades 16 in the extending direction E may be set arbitrarily.

  The second screw blade 18 spirally extends on the outer peripheral surface of the screw shaft 12 along the extending direction E inside the casing 10. The second screw blade 18 is provided at a position shifted from the first screw blade 16 by a predetermined distance along the extending direction E, and is wound in the same winding direction as the first screw blade 16. Have been. The second screw blade 18 also rotates with the rotation of the screw shaft 12. Furthermore, the second screw blade 18 extends spirally from one end 18C to the other end 18B. One end 18C is a position where the winding of the second screw blade 18 is started, and in the extending direction E, between one end 16C of the first screw blade 16 and the target object inlet 32A. It is located in. The other end 18B is a position where the winding of the second screw blade 18 ends, and is located between the other end 16B of the first screw blade 16 and the object inlet 32A in the extending direction E. doing. Therefore, the second screw blade 18 extends from one end 18C to the other end 18B via a portion overlapping the target object inlet 32A when viewed from the radial direction with the extending direction E as the central axis. Exist. In the present embodiment, the pitch P2 of the second screw blades 18, that is, the distance between the adjacent second screw blades 18 in the extending direction E is the same as the pitch P1 of the first screw blades 16. . However, the pitch P2 may be different in length from the pitch P1.

  Thus, the second screw blade 18 extends from one end 18C to the other end 18B, and the first screw blade 16 extends from one end 16C to the other end 16B. doing. Therefore, in a section along the extending direction E from one end 18C of the second screw blade 18 to the other end 18B of the second screw blade 18 (hereinafter, this section is referred to as a transport section KA), Both a first screw blade 16 and a second screw blade 18 are provided. Also, a section along the extending direction E from the other end 18B of the second screw blade 18 to the other end 16B of the first screw blade 16 (hereinafter, this section is referred to as an object transport section KB). A section along the extending direction E from one end 18C of the second screw blade 18 to one end 16C of the first screw blade 16 (hereinafter, this section is referred to as a separated liquid transport section KC). The first screw blade 16 is provided, and the second screw blade 18 is not provided.

  The transport promotion section KA is a section between the object transport section KB and the separated liquid transport section KC in the extending direction E. The transport promotion section KA is set so as to overlap the object input port 32A in at least a part of the section when viewed from the radial direction of the caging 10 with the extending direction E as the central axis. In other words, in the transport promotion section KA, at least a part of the section is at the same position as the target object insertion port 32A in the extending direction E. The object transport section KB is a section on the other end 30B side of the caging 10, that is, on the object outlet 32B side. It can be said that the object transport section KB is a section closer to the other end 30B than the transport promoting section KA, that is, closer to the object discharge port 32B. The separated liquid transport section KC is a section on the one end 30C side of the caging 10, that is, the separated liquid discharge port 32C side. It can be said that the separated liquid transport section KC is a section closer to one end 30C, that is, to the separated liquid discharge port 32C than the transport promoting section KA. The target object transport section KB and the separated liquid transport section KC do not overlap with the target object inlet 32A as viewed from the radial direction of the caging 10 with the extension direction E as the central axis. That is, the object transport section KB is located on the other end 30B side of the object inlet 32A in the extending direction E, and the separated liquid transport section KC is located in the object inlet 32A in the extending direction E. Is located on one end 30C side. The length of the transport promotion section KA along the extending direction E is arbitrary, but is preferably, for example, 30% or more and 70% or less of the entire length of the caging 10 along the extending direction.

  The object transport section KB and the separated liquid transport section KC are sections in which only the first screw blade 16 is provided. Accordingly, the pitch of the screw blade portions 14 in the object transport section KB and the separated liquid transport section KC is the pitch P1, which is the distance between the adjacent first screw blades 16 in the extending direction E. On the other hand, the transport promotion section KA is a section in which both the first screw blade 16 and the second screw blade 18 are provided. Therefore, in the transport promotion section KA, the first screw blade 16 and the second screw blade 18 are adjacent to each other in the extending direction E. Therefore, the pitch of the screw blade portions 14 in the transport promotion section KA is the pitch P3 which is the distance between the first screw blade 16 and the second screw blade 18 adjacent in the extending direction E. The pitch P3 is shorter (smaller) than the pitch P1. Therefore, it can be said that the pitch of the screw blade portion 14 in the transport promoting section KA is shorter than the pitch in the separated liquid transport section KC and the object transport section KB. The pitch P3 is preferably, for example, 30% or more and 70% or less of the pitch P1.

  In the present embodiment, the first screw blade 16 and the second screw blade 18 are provided as a plurality of screw blades, but the number of screw blades is arbitrary. For example, the screw blade section 14 may have three or more screw blades. When three screw blades are provided, the screw blade section 14 may provide three screw blades in the transport promotion section KA, and may provide one screw blade in the separated liquid transport section KC and the object transport section KB. Alternatively, the screw blade section 14 may be provided with three screw blades in the transfer promotion section KA and two screw blades in the separated liquid transfer section KC and the object transfer section KB. As still another example, the screw blade section 14 is provided with a section having three screw blades, a section having two screw blades, and a section having one screw blade. May be gradually reduced. That is, it can be said that the screw blade section 14 has a larger number of screw blades in the transport promotion section KA than the number of screw blades in the object transport section KB. It can be said that the number is greater than the number of screw blades in the liquid transport section KC and the object transport section KB. The screw blade section 14 may have one screw blade, but an example thereof will be described later.

  The tip (outer peripheral portion) 16 </ b> S of the first screw blade 16 is configured to have a gap H between it and the inner peripheral surface of the caging 10. That is, the tip 16S of the first screw blade 16 does not come into contact with the inner peripheral surface of the caging 10 and is separated by the gap H. Similarly, the distal end portion 18S of the second screw blade 18 is configured such that a gap H is formed between the distal end portion 18S and the inner peripheral surface of the caging 10. That is, the tip portion 18S of the second screw blade 18 does not come into contact with the inner peripheral surface of the caging 10 and is separated by the gap H. The gap H is a minute gap, and has a size that suppresses (blocks) at least a part of the object A from passing. The gap H has a size that allows a liquid component such as the separation liquid C to pass therethrough. The gap H is specifically a gap of, for example, about 1 to 2 mm.

  The partition 20 is a baffle provided on the screw blade 14 to suppress the outflow of the target A. The partition 20 is provided at the same position as one end 18C of the second screw blade 18 in the extending direction E. Furthermore, in the present embodiment, the partition wall portion 20 includes a partition wall portion 20A provided on a surface on the direction X1 side of one end portion 18C of the second screw blade 18 and one end portion of the second screw blade 18. And a partition wall 20B provided on the surface on the direction X2 side of 18C. Therefore, it can be said that the partition 20 is provided at a position between the transport promoting section KA and the separated liquid transport section KC, that is, at a boundary position between the transport promoting section KA and the separated liquid transport section KC. However, if the partition wall portion 20 is located between the one end portion 30C and the intermediate portion 30A of the caging 10 in the extending direction E, that is, between the separated liquid discharge port 32C and the target object inlet port 32A. Good.

  FIG. 2 is a partially enlarged view of a cross section of the screw-type separation device according to the present embodiment. FIG. 2 shows a case where the partition wall portion 20 is viewed from the front. As shown in FIG. 2, the surface on the direction X1 side of the second screw blade 18 is a surface 18T1, and the surface on the direction X2 side is a surface 18T2. The surface of the first screw blade 16 located in the direction X1 of the surface 18T1 and facing the surface 18T1 is referred to as a surface 16T1. The surface of the first screw blade 16 located on the direction X2 side of the surface 18T2 and facing the surface 18T2 is referred to as a surface 16T2. A region formed between the surface 16T1 and the surface 18T1 and a region formed between the surface 16T2 and the surface 18T2 are referred to as a region R. The region R includes a surface of the first screw blade 16 (the surface 16T1 or the surface 16T2), a surface of the second screw blade 18 facing the surface of the first screw blade 16 (the surface 18T1 or the surface 18T2), It can also be said that the area is defined (enclosed) by the outer peripheral surface and a line connecting the tip portion 16S of the first screw blade 16 and the tip portion 18S of the second screw blade 18.

  Specifically, the partition 20A has one side 20T1 connected to the surface 16T1 of the first screw blade 16, the other side 20T2 connected to the surface 18T1 of the second screw blade, and one side 20T1. To the other side 20T2 in the extending direction E. Further, the partition wall portion 20A has a bottom portion 20T3 connected to the outer peripheral surface of the screw shaft 12, and extends outward from the bottom portion 20T3 to the tip end portion 20T4 in the radial direction with the extending direction E as the central axis. The distal end portion 20T4 of the partition wall portion 20A is located radially inward with respect to the extending direction E as a central axis, from the distal end portion 16S of the first screw blade 16 and the distal end portion 18S of the second screw blade 18. The partition 20A is formed continuously from one side 20T1 to the other side 20T2. In other words, an opening is formed between one side 20T1 and the other side 20T2. It has not been. The partition 20A is formed continuously from the bottom 20T3 to the tip 20T4, in other words, no opening is formed between the bottom 20T3 and the tip 20T4. The same applies to the partition 20B.

  Since the partition wall portion 20 is configured as described above, it overlaps the radially inner region R1 of the region R. In addition, since the partition wall portion 20 is not provided radially outside of the region R1, it does not overlap with the region R2 of the region R that is radially outside of the region R1. That is, it can be said that the partition 20 overlaps the radially inner region R1 of the region R and opens the radially outer region R2. In this embodiment, the partition wall portion 20 overlaps the radially inner region R1 of the region R in this embodiment. However, if the partition wall portion 20 overlaps a part of the region R and opens another part, the partition wall portion 20 is formed in the region R1. The shape is not limited to the shape that overlaps and opens the region R2, and may be any shape. For example, in the partition 20, the tip 20T4 extends to the positions of the tip 16S and the tip 18S, and an opening is formed between the bottom 20T3 and the tip 20T4 to form a region where the opening is formed. It may be configured to be open and overlap other areas. Further, two partition walls 20 are provided in this embodiment, but the number of the partition walls 20 may be the same as the number of screw blades.

  Here, in the transport promotion section KA, a space formed by the first screw blade 16 and the second screw blade 18 adjacent in the extending direction E is referred to as a transport promotion space TA. In the object transport section KB, a space formed between the first screw blades 16 adjacent in the extending direction E is referred to as an object transport space TB. In the separated liquid transport section KC, a space formed between the first screw blades 16 adjacent to each other in the extending direction E is referred to as a separated liquid transport space TC. As described above, since the partition 20 is provided between the transport promoting section KA and the separation liquid transport section KC, the partition 20 is provided between the separation liquid transport space TC and the transport promoting space TA. It can be said that it is. Therefore, the separated liquid transport space T1 and the transport promoting space TA are shut off in the region R1 where the partition wall 20 is provided, and communicate with each other in the region R2 where the partition wall 20 is not provided. On the other hand, since no partition is provided between the object transport section KB and the transport promotion space TA, the object transport section KB and the transport promotion space TA communicate with each other without being interrupted. The partition 20 is provided to prevent the target A in the transport promotion space TA from entering the target transport section KB, but is not necessarily provided.

  The flow rate adjusting tank 22 is a tank connected to the target object outlet 32B. The flow rate adjusting tank 22 stores the dehydrated target A discharged from the target discharge outlet 32B, and serves as a discharge suppression unit so that the target A and the separated liquid C before dehydration are discharged from the target discharge outlet 32B. The liquid C is prevented from being discharged to the outside, and the separated liquid C is kept in the caging 10. The flow rate adjusting tank 22 is a container having a bottom surface portion 22A and an upper surface portion 22B, and has a space therein. The bottom surface portion 22A is an end surface of the flow control tank 22 on the direction Z2 side, and the upper surface portion 22B is an end surface of the flow control tank 22 on the direction Z1 side. The flow rate adjusting tank 22 is located on the direction Z1 side of the object outlet 32B, in other words, at least the upper surface portion 22B is located on the direction Z1 side of the object outlet 32B. The flow control tank 22 has a connection port 49 and a flow control discharge port 50 which are open. The connection port 49 is an opening provided on the side of the flow rate adjusting tank 22 in the direction Z2 (the bottom surface 22A side). The connection port 49 communicates with the object discharge port 32B of the casing 10. The flow rate adjusting outlet 50 is an opening provided on the side of the flow rate adjusting tank 22 in the direction Z1 (the upper surface portion 22B side). It is preferable that the flow rate adjusting outlet 50 is provided at the same position as the separated liquid outlet 32C of the caging 10 in the direction Z. However, the position of the flow rate adjustment outlet 50 is arbitrary as long as it is provided on the direction Z1 side of the connection port 49 communicating with the target object outlet 32B. As described above, the flow rate adjusting tank 22 is connected to the object discharge port 32B, and stores therein the dehydrated object A discharged from the object discharge port 32B, so that the object before dehydration is stored. The discharge of the object A is dammed, and the stored dehydrated object A can be discharged from the flow rate adjusting discharge port 50. However, the volume of the flow rate adjusting tank 22 may be small as long as the target A and the separated liquid C before dehydration can be stopped from being discharged from the target outlet 32B to the outside.

  Further, the flow regulating tank 22 may have the regulating dam 51 attached to the flow regulating outlet 50. The regulating weir 51 is provided on the direction Z2 side of the flow rate adjusting outlet 50 and is movable along the direction Z under the control of the control unit 26. The adjustment weir portion 51 covers at least a part of the area of the flow rate adjustment discharge port 50 on the direction Z2 side by moving in the direction Z1 side. The adjustment dam 51 opens the flow adjustment discharge port 50 by moving in the direction Z2. The adjusting weir 51 moves in accordance with the level of the separated liquid C in the casing 10.

  Note that the flow rate adjusting tank 22 does not necessarily have to be provided. Instead of the flow rate adjusting tank 22, a pump connected to the object discharge port 32B and capable of adjusting the discharge amount of the object A from the object discharge port 32B may be provided.

  The input section 24 is connected to the target input port 32A, and is a device that controls the input amount of the previous target A0 into the caging 10. The input unit 24 is, for example, an on-off valve, and inputs the front target A0 into the caging 10 by opening, and stops the input of the front target A0 into the caging 10 by closing. Further, the input section 24 can also adjust the input amount of the front target A0 by adjusting the opening degree. The input unit 24 controls the input amount of the front target A0 into the caging 10 under the control of the control unit 26. However, the charging section 24 is not limited to the on-off valve as long as it controls the charging amount of the front target A0 into the caging 10, and may be, for example, a pump for conveying sludge.

  The inclination adjusting unit 25 is attached to the caging 10. The tilt adjusting unit 25 changes the tilt angle θ of the caging 10 under the control of the control unit 26. However, the inclination adjusting unit 25 is not necessarily provided, and the inclination angle θ may be constant.

  The control unit 26 is a control device that controls the operation of the screw-type separation device 1. The control unit 26 controls the rotation of the screw shaft 12, the input amount of the front target A <b> 0 by the input unit 24, and the change of the tilt angle θ by the tilt adjustment unit 25.

(Operation of screw type separation device)
Next, the operation of the screw-type separation device 1 configured as described above and the behavior of an object will be described. FIG. 3 is a schematic diagram for explaining the operation of the screw-type separation device according to the present embodiment.

  As shown in FIG. 3, the control unit 26 controls the input unit 24 to input the previous target object A0 into the caging 10 from the target object input port 302C. Since the position of the target object inlet 32A overlaps the transport promotion space TA (transport promotion section KA), the front target A0 from the target object inlet 32A is thrown into the transport promotion space TA. Further, the control unit 26 rotates the screw shaft 12. Therefore, the front object A0 thrown into the transport promotion space TA is pushed by the surface of the first screw blade 16 and the surface of the second screw blade 18 in the transport promotion space TA, and moves toward the object discharge port 32B. Moving. More specifically, the front target A0 includes a solid component A1 and a liquid component. Since the solid component A1 easily generates a frictional force between the surface of the first screw blade 16 and the surface of the second screw blade 18, the solid component A1 is pushed by the surface of the first screw blade 16 and the surface of the second screw blade 18. Then, it moves in the transport promotion space TA to the object discharge port 32B side, and enters the target object transport space TB from the transport promotion space TA. On the other hand, the liquid component contained in the front target object A0 hardly generates a frictional force with the surface of the first screw blade 16 and the surface of the second screw blade 18 in the transport promoting space TA, and the surface of the first screw blade 16 It is difficult to be pushed by the surface of the second screw blade 18. Therefore, the solid component A1 preferentially enters the object transport space TB over the liquid component, and the solid component A1 is supplied into the object transport space TB as the object A while being separated from the liquid component. Is done.

  In addition, since the transport promoting space TA has the first screw blade 16 and the second screw blade 18 and has a small pitch, it can be said that the number of screw blades is large. Accordingly, the screw-type separation device 1 increases the contact area between the surface of the screw blade and the solid component A1 in the transfer promoting space TA, thereby improving the efficiency of supplying the solid component A1 to the object transfer space TB. On the other hand, the object A from which the liquid component has been separated has a reduced water content, so that the object A slips on the surface of the screw blade, and the transfer efficiency when pushing on the surface of the screw blade may be reduced. Further, when the pitch of the screw blades is small, the passage area through which the object A is conveyed becomes small, and the possibility that the object A is clogged increases. On the other hand, in the screw-type separation device 1, only the first screw blade 16 is provided in the object transport space TB to which the object A is supplied to increase the pitch. As a result, the screw-type separation device 1 causes the object A accumulated in the object transport space TB to contact the inner peripheral surface 10A of the casing 10 in the object transport space TB, thereby causing friction with the inner peripheral surface 10A. By the force, the object A can be suitably transported to the object outlet 32B side. That is, the screw-type separation device 1 favorably conveys on the inner peripheral surface 10A of the caging 10 instead of the surface of the screw blade in the object conveying space TB. Further, the screw-type separation device 1 keeps the passage area large by suppressing the clogging of the target A by increasing the pitch of the screw blades in the target transfer space TB. Further, the object A is further dehydrated in the object transport space TB by the transport and its own weight, and the liquid component separated by the dehydration is separated as a separated liquid C into the transport promoting space TA via the gap H. Return.

  The object A conveyed to the object discharge space 32B side in the object conveyance space TB is discharged to the outside of the caging 10 from the object discharge space 32B communicating with the object conveyance space TB, and is discharged from the flow control tank 22. Supplied to The flow control tank 22 deposits the object A, dams the pre-dewatering object A0 and the separated liquid C before dehydration in the caging 10, and the pre-dewatering object A0 and the separated liquid C before dewatering are discharged from the target outlet 32B. From being discharged to the outside. The object A deposited on the flow rate adjusting tank 22 is discharged from the flow rate adjusting outlet 50 to the outside.

  On the other hand, since the liquid component contained in the front target object A0 is hard to be pushed by the surfaces of the first screw blade 16 and the second screw blade 18 as described above, the liquid component is prevented from going to the target object transport space TB, and the solid component is suppressed. As the separated liquid C separated from A1, the liquid accumulates in the transport promoting space TA. The separated liquid C separated from the solid component A1 rises in water level by accumulating and enters the separated liquid transport space TC from the transport promoting space TA through the gap H. The separated liquid C that has entered the separated liquid transport space TC is discharged to the outside of the caging 10 from the separated liquid discharge port 32C that communicates with the separated liquid transport space TC. Here, since the separated liquid transport space TC is a space having only the first screw blade 16 and a large pitch, it can be said that it is a space having a small number of screw blades. The screw-type separation device 1 suppresses the speed at which the separated liquid C is discharged from the separated liquid discharge port 32C by increasing the pitch of the screw blades in the separated liquid transport space TC. Thereby, even if the solid component A1 is mixed into the separated liquid transport space TC, the screw type separation device 1 suppresses the solid component A1 from being discharged together with the separated liquid C from the separated liquid outlet 32C, and The component A1 can be easily settled, and a decrease in the separation efficiency of the separation liquid C can be suppressed.

  Further, a partition 20 is provided between the separation liquid transport space TC and the transport promoting space TA. The screw-type separation device 1 can suppress the intrusion of the solid component A1 from the transfer promotion space TA into the separated liquid transfer space TC by providing the partition 20. Further, since the partition wall portion 20 covers only a part of the region R1 of the region R between the transfer promoting space TA and the separated liquid transfer space TC and opens the region R2, if the separated liquid transfer space TC is solid Even if the component A1 is mixed, the mixed solid component A1 settles in the separated liquid transfer space TC, and can return to the transfer promotion space TA through the region R2. Therefore, the screw-type separation device 1 can appropriately return the mixed solid component A1 to the transport promotion space TA, suppress a decrease in the separation efficiency of the separated liquid C, and furthermore, the solid component A1 Clogging in the gap H or the like between the TC and the transport promotion space TA can be suppressed. As described above, the partition wall portion 20 covers the partial region R1, thereby suppressing the solid component A1 from entering the separated liquid transport space TC and opening the other partial region R2 to separate the solid component A1. The solid component A1 that has entered the liquid transfer space TC is suitably returned to the transfer promotion space TA. In addition, the solid component A1 is transported in the radial direction inside (the screw shaft 12 side) in the transport promoting space TA. The partition 20 opens the radially outer region R2, not the radially inner region where the solid component A1 is transported, so that the solid component A1 in the transport promoting space TA is opened from the opened region R2. It is possible to prevent the liquid from entering the separated liquid transport space TC. Further, the partition wall portion 20 suppresses the narrowing of the radially outer gap H by opening the radially outer region R2, and more suitably suppresses the clogging of the gap H with the solid component A1. I have.

  As described above, the screw-type separation device 1 according to the present embodiment includes the caging 10, the screw shaft 12, and the screw blade 14. The caging 10 has a separated liquid outlet 32C, an object outlet 32B, and an object inlet 32A. The separated liquid discharge port 32C is provided on the one end 30C side of the caging 10, and discharges the separated liquid C separated from the previous target A0 by dehydration. The object discharge port 32B is provided on the other end 30B side of the caging 10 and discharges the dehydrated object A. The target object inlet 32A is provided between the separated liquid outlet 32C and the target object outlet 32B, and receives the previous target A0. The screw shaft 12 is provided inside the casing 10 and extends along an extending direction E from one end 30C to the other end 30B. The screw blade portion 14 extends spirally on the outer peripheral surface of the screw shaft 12. The screw blade portion 14 has a pitch P3 of the transport promotion section KA including a portion overlapping with the target object inlet 32A when viewed from the radial direction of the caging 10, and a pitch P3 of the object discharge port 32B side with respect to the transport promotion section KA. It is shorter than the pitch P1 of a certain object transport section KB. The screw-type separation device 1 rotates the screw shaft 12 to convert the previous target A0, which has been input from the target input port 32A, into the transport promotion section KA (the transport promotion space TA) and the target transport section KB (the target transport section). Dehydration is performed while moving to the object discharge port 32B through the transfer space TB). The screw-type separation device 1 discharges the dehydrated object A from the object discharge port 32B, and discharges the separated liquid C from the separated liquid discharge port 32C.

  The screw-type separation device 1 according to the present embodiment shortens the pitch of the screw blades in the transport promotion section KA (transport promotion space TA) into which the previous target object A0 before dehydration is introduced, and performs the transport promotion section KA (transport promotion space). TA), the pitch of the screw blades in the object transport section KB (object transport space TB), which is a section on the object outlet 32B side, is increased. The screw-type separation device 1 moves the solid component A1 contained in the previous target A0 before dehydration to the target transport zone KB by the surface of the screw blade by shortening the pitch of the screw blades in the transport promotion zone KA. Thus, the movement of the liquid component to the object transport section KB is suppressed. Thus, the screw-type separation device 1 can appropriately dewater the previous object A0. Furthermore, the screw-type separation device 1 increases the pitch of the object transport section KB so that the object A can be suitably discharged from the object outlet 32B while suppressing clogging of the dehydrated object A. It is possible. Therefore, the screw-type separation device 1 according to the present embodiment can efficiently separate the liquid component from the previous target A0 containing the liquid, and suppresses the clogging of the dehydrated target A, thereby reducing the cost. Enables maintenance.

  In the screw blade section 14, the pitch of the transport promoting section KA (transport promoting space TA) is greater than the pitch of the separated liquid transport section KC (separated liquid transport space TC) closer to the separated liquid outlet 32C than the transport promoting section K3. Too short. By increasing the pitch of the separation liquid transport section KC, the screw type separation device 1 facilitates the sedimentation of the solid component A1 even if the solid component A1 is mixed in the separation liquid transport space TC, and separates the separation liquid C. A decrease in efficiency can be suppressed.

  Further, the screw blade portion 14 spirally extends on the outer peripheral surface of the screw shaft 12 and has a plurality of screw blades provided at predetermined intervals along the extending direction. The number of screw blades in the transport promotion section KA is larger than the number of screw blades in the object transport section KB. By increasing the number of screw blades in the transport promotion section KA, the screw-type separation device 1 can appropriately shorten the pitch in the transport promotion section KA, and can efficiently separate the liquid component from the preceding object A0. .

  The screw blade portion 14 spirally extends on the outer peripheral surface of the screw shaft 12 and has a plurality of screw blades provided at predetermined intervals along the extending direction E. The number of screw blades in the transport promotion section KA is larger than the number of screw blades in the object transport section KB and the separated liquid transport section KC. The screw-type separation device 1 preferably increases the number of screw blades in the transport promotion section KA, and reduces the number of screw blades in the object transport section KB and the separation liquid transport section KC, so that the pitch in the transport promotion section KA is suitable. And the liquid component can be efficiently separated from the preceding object A0.

  Further, the screw-type separation device 1 has a partition 20. The partition 20 is disposed between the target object inlet 32A and the separated liquid outlet 32C in the extending direction E, and is formed in a part of a region R formed between adjacent screw blades in the extending direction E. It is provided so that it may overlap. Since the partition wall 20 covers a part of the region R between the target object inlet 32A and the separated liquid outlet 32C, the separated liquid is prevented while the solid component A1 is prevented from entering the separated liquid transport section KC. The solid component A1 that has entered the transport section KC can be suitably returned to the transport promoting section KA.

  In the region R formed between the screw blades adjacent to each other in the extending direction E, the partition wall portion 20 is located radially inward of the radially outer tip portions (tip portions 16S and 18S) of the screw blades. The region R2 overlapping the region R1 and radially outside the region R1 is opened. By opening the radially outer region R2 of the partition 20, the solid component A1 can be suitably prevented from clogging the gap H.

  Hereinafter, another example of the present embodiment will be described. FIG. 4 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. As shown in the screw-type separation device 1a in FIG. 4, the separation liquid transport section KC may not be provided. Specifically, as shown in FIG. 4, the second screw blade 18a of the screw blade 14a has one end 18aC different from that in FIG. At the same position, the other end 18aB is located between the other end 16B of the first screw blade 16 and the object inlet 32A, as in FIG. Therefore, in the screw-type separation device 1a, the section from one end 18aC (or one end 16C) to the other end 18aB is the transport promotion section KA, and the other end 18aB to the other end 16B. The section up to is the object transport section KB. Even if the screw type separation device 1a does not have the separation liquid conveyance section KC, it has the conveyance promotion section KA and the object conveyance section KB. Can be maintained.

  FIG. 5 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. As shown in the screw-type separation device 1b in FIG. 5, the screw blade may have one screw blade instead of a plurality. That is, the screw blade portion 14b shown in FIG. 5 has one screw blade 16b, and differs from FIG. 1 in that the screw blade 16b has a different pitch for each position in the extending direction E. The screw blade 16b has a pitch P3b in a section (conveyance promoting section KA) from the middle section 16Db to the middle section 16Eb, a pitch in a section (object transfer section KB) from the middle section 16Eb to the other end 16Bb, and It is shorter than the pitch of the section (separated liquid transport section KC) from one end 16Cb to the intermediate section 16Db. The intermediate portion 16Db is a portion between the one end 16Cb and the object input port 32A in the extending direction E, and the intermediate portion 16Eb is connected to the object input port 32A and the other end 16Bb in the extending direction E. And between Note that, even when one screw blade is provided as in the case of the screw-type separation device 1b, the separation liquid transport section KC may not be provided as described with reference to FIG.

  FIG. 6 is a partial cross-sectional view of a screw-type separation device according to another example of the present embodiment. As shown in the screw type separation device 1c in FIG. 6, the pitch of the screw blades may be the same in all sections along the extending direction E. Specifically, as shown in FIG. 6, the screw-type separation device 1c has a screw blade portion 14c and a partition wall portion 20c. Since the screw blade portion 14c shown in FIG. 6 includes only the first screw blades 16 having the same pitch, the pitch is equal in all sections along the extending direction E. The screw blade portion 14c differs from the screw blade portion 14 in FIG. 1 in which the pitch is different in each section, in that the pitch in all sections is equal. The partition 20c is located between the separated liquid outlet 32C and the target object inlet 32A, and is provided between adjacent screw blades 14c in the extending direction E. The partition wall portion 20c overlaps the region R formed between the adjacent screw blade portions 14c, and more preferably, a part of the region R, similar to the partition wall portions 20A and 20B shown in FIGS. 1 and 2. It overlaps R1. In the example of FIG. 6, the screw blade portion 14c has only one first screw blade 16, but a plurality of screw blades are provided in all sections along the extending direction E, and a plurality of screw blades 14c are provided. May be equal in all sections along the extending direction E.

  As described above, the screw-type separation device 1c includes the caging 10, the screw shaft 12, the screw blade 14c, and the partition 20c. The partition wall portion 20c is disposed between the target object inlet 32A and the separated liquid outlet 32C in the extending direction E, and overlaps a region R formed between adjacent screw blades in the extending direction E. Provided. By rotating the screw shaft 12, the screw type separation device 1c dehydrates the previous target A0, which has been input from the target input port 32A, while moving the previous target A0 to the target output outlet 32B, and dehydrates the dehydrated target A. The separated liquid C is discharged from the object discharge port 32B, and the separated liquid C is discharged from the separated liquid discharge port 32C. Even when the pitch of the screw blade portions 14c is equal, the partition wall portion 20c is disposed between the target object inlet 32A and the separated liquid outlet 32C so that the solid component A1 enters the separated liquid outlet 32C. While the solid component A1 that has entered the separated liquid outlet 32C side is returned to the target object outlet 32B. Therefore, the screw-type separation device suppresses mixing of the solid component A1 into the separation liquid C by providing a partition wall between the target object inlet 32A and the separation liquid outlet 32C, thereby reducing the efficiency of the liquid component. Separation can be performed well and low-cost maintenance can be performed.

(First embodiment)
Next, a wastewater treatment system as a first embodiment including the above-described screw type separation devices 1 and 1a will be described. FIG. 7 is a configuration diagram illustrating a part of the wastewater treatment system according to the first embodiment.

  As shown in FIG. 7, a wastewater treatment system 100 according to the first embodiment includes a sedimentation basin 101, a pre-stage facility 102 disposed in a stage preceding the sedimentation basin 101, and a post-stage facility disposed in a stage subsequent to the sedimentation basin 101. 103, a drawing pump 104, and a screw-type separation device 1 (1a). The sedimentation basin 101 is a solid-liquid separation tank that sediments and separates the water to be treated supplied from the pre-stage equipment 102 into a separated liquid and sludge. The first-stage facility 102 is a facility configured to have various treatment tanks such as a reaction tank for treating organic wastewater such as sewage. The downstream equipment 103 is an equipment that includes, for example, an incinerator and performs incineration and disposal of sludge (condensed sludge) discharged from the screw-type separation device 1. The drawing pump 104 is a sludge drawing means for drawing sludge from the sedimentation basin 101 and supplying the sludge to the screw-type separation device 1. The screw-type separation device 1 is provided vertically above the sedimentation basin 101 (in a direction away from the ground).

  In the wastewater treatment system 100, at least a part of the water to be treated discharged from the upstream equipment 102 is supplied to the sedimentation basin 101. In the sedimentation basin 101, the supplied treated water is settled and separated into a separation liquid and sludge. Then, the separated sludge is drawn out from the lower part of the sedimentation basin 101 by the drawing pump 104 and supplied to the screw-type separation device 1. The extracted sludge is carried into the screw-type separation device 1 as the front target A0 through the target input port 32A (see FIG. 1).

  In the screw-type separation device 1, the separation liquid C is separated in the same manner as in the above-described embodiment. The separated liquid C separated is returned to the sedimentation basin 101. The object A after being separated (after being dehydrated) is conveyed to the downstream equipment 103 as concentrated sludge, and is subjected to incineration and disposal. As described above, the waste water treatment according to the first embodiment is executed.

  According to the first example described above, using the screw-type separation device 1 according to the above-described embodiment, the pre-object A0 drawn from the sedimentation basin 101 is concentrated, and the separated liquid C is returned to the sedimentation basin 101. ing. Thereby, while being able to improve the concentration concentration of the target substance A, the maintenance and management of the sedimentation basin 101 can be significantly improved. That is, in many cases, intermediate water exists in the sedimentation basin 101. When such intermediate water is present, moisture is more preferentially extracted than sludge (previous object A0) when sludge (previous object A0) is extracted. Therefore, there is a problem that even if the sludge (the previous target A0) is compressed, the concentration of the concentrated does not increase. According to the above-described first embodiment for this problem, the screw-type separation device 1 is provided at the subsequent stage of the sedimentation basin 101, so that only the intermediate water is extracted from the extracted sludge (the previous target A0). It can be separated and returned to the sedimentation basin 101. For this reason, the concentration of the sludge (the pre-target A0) can be improved, so that the concentration of the sludge (the pre-target A0) can be increased even if the sedimentation basin 101 contains the intermediate water as in the related art. Can be improved. In addition, since the above-described screw-type separation device 1 can be manufactured at low cost, the wastewater treatment system 100 can also be realized at low cost. Furthermore, even if the sludge (the previous target A0) is clogged in the caging 10, the clogging can be easily removed by rotating the screw shaft 12 in the reverse direction D.

(First Modification of First Embodiment)
Next, a modified example of the above-described first embodiment will be described. FIG. 8 is a schematic diagram illustrating a sedimentation basin for describing a modification of the first embodiment. As shown in FIG. 8, in the first modification, a screw-type separation device 1 according to one embodiment is provided below a sedimentation tank 101. Then, the sludge settled at the lower part of the sedimentation basin 101 is put into the screw type separation device 1 through the target material inlet 32A (see FIG. 1) using a sludge recovery device (not shown) such as a funnel. Supply as thing A0. The screw-type separation device 1 discharges the concentrated sludge (object A) to the outside, and returns the separated separated liquid C into the sedimentation basin 101 via a pipe (not shown) or the like through the inside or the outside. In addition, it is also possible to discharge the separation liquid C to the outside. Other configurations are the same as those of the first embodiment.

(Second Modification of First Embodiment)
Further, as a second modified example, when a gravity settling tank such as a sedimentation basin 101 is provided in front of the screw-type separation device 1, the sedimentation basin 101 is formed of a rod-shaped member that stands upright on the upper side of the rake that scrapes the sludge. It is also possible to provide a picket fence (not shown). By providing the picket fence, sedimentation of sludge can be promoted in the sedimentation basin 101, and so-called coagulation is promoted. Therefore, the separation of the object A and the separation liquid C by the screw-type separation device 1 can be made more efficient, and the solid-liquid separation property can be greatly improved.

(Second embodiment)
Next, a wastewater treatment system as a second example including the screw-type separation device 1 according to the above-described embodiment will be described. FIG. 9 is a configuration diagram illustrating a part of the wastewater treatment system according to the second embodiment.

  As shown in FIG. 9, a wastewater treatment system 200 according to the second embodiment includes a reaction tank 201, a front-stage facility 202 disposed before the reaction tank 201, and a sedimentation pond disposed after the reaction tank 201. 204, a drawing pump 203a, 203b, and a screw-type separation device 1. The screw-type separation device 1 is provided vertically above the reaction tank 201 and the sedimentation basin 204 (in a direction away from the ground surface).

  The reaction tank 201 includes, for example, a plurality of biological reaction tanks. The biological reaction tank constituting the reaction tank 201 is, for example, various biological reaction tanks such as an anaerobic tank, an oxygen-free tank, and an aerobic tank. The first-stage facility 202 is a facility configured to have a settling basin, an inclined plate sedimentation basin, and the like for treating organic wastewater such as sewage. The drawing pump 203a is a sludge drawing means for drawing sludge such as activated sludge from the reaction tank 201 and supplying the sludge as the preceding target A0 to the screw-type separation device 1. Similarly, the drawing pump 203b is a sludge drawing means for drawing sludge from the reaction tank 201 and supplying the sludge to the sedimentation basin 204 at the subsequent stage. The sedimentation basin 204 is a solid-liquid separation tank that sediments and separates the water to be treated and the separated liquid C supplied from the reaction tank 201 and the screw-type separation device 1 into a separated liquid C and sludge (object A).

  In the wastewater treatment system 200 according to the second embodiment, at least a part of the water to be treated discharged from the upstream equipment 202 is supplied to the reaction tank 201. In the reaction tank 201, biological treatment such as nitrification treatment or denitrification treatment is performed on the water to be treated. The activated sludge in the reaction tank 201 is withdrawn by the withdrawal pumps 203a and 203b. The sludge extracted by the extraction pump 203a is supplied to the screw-type separation device 1 as the front target A0, and is carried into the inside through the target input port 32A (see FIG. 1).

  In the screw-type separation device 1, the sludge carried in (the target object A0) is concentrated and the separation liquid C is separated. The separated liquid C is supplied to the sedimentation basin 204 at the subsequent stage. On the other hand, the sludge and the water to be treated that are drawn from the reaction tank 201 by the drawing pump 203b are supplied to the sedimentation basin 204. In the sedimentation basin 204, a solid-liquid separation process by gravity sedimentation is executed as in the first embodiment. As described above, the waste water treatment according to the second embodiment is executed.

  According to the second embodiment described above, the sludge (former object A0) is pulled out from the reaction tank 201 using the screw-type separation device 1, and compressed and concentrated. While being returned to the tank 201, the separation liquid C is supplied to a sedimentation basin 204 as a solid-liquid separation tank. Thereby, the following problems can be solved.

  That is, conventionally, the electric power used to operate the return pump (not shown) for returning the sludge (object A) from the sedimentation tank 204 to the reaction tank 201 was extremely large. On the other hand, according to the second embodiment, the sludge (object A) compressed and concentrated using the screw-type separation device 1 can be returned to the reaction tank 201, so that it is necessary to return the sludge (object A). Power can be greatly reduced. Further, by using the screw-type separation device 1, solid-liquid separation can be sufficiently performed. Thus, the frequency of sludge withdrawal in the sedimentation basin 204 can be reduced, so that power can be reduced in the wastewater treatment system 200 to save energy.

  Conventionally, in the case of a configuration in which a separation membrane is provided in the reaction tank 201, there has been a problem that the initial cost and the burden required for maintenance of the equipment are large. On the other hand, since a low-cost screw-type separation device 1 can be introduced instead of the separation membrane, the initial cost can be reduced. Further, since the maintenance of the screw-type separation device 1 is easy, the burden of maintenance can be reduced, so that the maintenance cost can be reduced.

  Furthermore, according to the second embodiment, since the reaction tank 201 can be made to have a high MLSS, the load on the sedimentation tank 204 can be reduced, and the drawing pumps 203a and 203b used for drawing sludge from the reaction tank 201 can be used. Power consumption can be reduced. Therefore, energy can be saved in the wastewater treatment system 200.

  In each embodiment, the sludge (the target object A0) charged into the screw-type separation device 1 does not contain a flocculant and does not contain a flocculant. That is, no coagulant was added to the sludge of the sedimentation basin 101, and no coagulant was added to the sludge of the reaction tank 201. Since the screw-type separation device 1 performs separation by gravity, it is possible to suppress a decrease in separation efficiency even for sludge that does not contain a flocculant. However, as described above, the sludge (the previous target A0) may be one to which a coagulant is added.

  Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above embodiments, and various modifications based on the technical idea of the present invention are possible. Further, the above-mentioned components include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are in the so-called equivalent range. Further, the components described above can be appropriately combined. Furthermore, various omissions, substitutions, or changes of the components can be made without departing from the spirit of the above-described embodiment. For example, the numerical values given in the above-described embodiment are merely examples, and different numerical values may be used as needed.

  In the above-described embodiment, the screw shaft 12 is constituted by a cylindrical shaft, but is not necessarily limited to this shape. For example, the screw shaft 12 may have a so-called enlarged shape in which the diameter gradually increases from one end 30C of the caging 10 toward the other end 30B.

  Further, in the above-described embodiment, the solid-liquid separation device that separates sludge into solid content and moisture is taken as an example. However, the present invention is not necessarily limited to solid-liquid separation of sludge, and the solid-liquid separation device separates solid and liquid. It is also possible to apply to various methods.

  Further, in the above-described embodiment, the position of the separated liquid outlet 32C can be configured to be variously changeable.

  In the above-described embodiment, the separation liquid C is moved through the gap H, but is not necessarily limited to the configuration of the gap H. For example, a filtration means having a mesh shape or a large number of micropores may be provided on at least a part of the first screw blade 16 or the second screw blade 18 so that the separation liquid C is movable.

  In addition, the screw-type separation device 1 according to the above-described embodiment can be used as a pre-concentrator for a dehydrator, a simple concentrator for consumer use, a merge improvement screen, and the like.

  In the first example of the above-described embodiment, the sludge extracted by the extraction pump 104 is the sludge settled in the sedimentation basin 101, but is not necessarily limited to the settled sludge. For example, floating sludge is likely to be generated in the sedimentation basin 101 in summer or the like. However, the floating sludge can be drawn out by the drawing pump 104 and supplied to the screw-type separation device 1.

  Further, in the first example described above, an example was described in which the screw-type separation device 1 according to one embodiment was combined with the sedimentation basin 101, but the present invention is not necessarily limited to this embodiment. Specifically, for example, it is also possible to combine the filtration and concentration device with the screw type separation device 1. In this case, the above-mentioned screw-type separation device 1 can be installed in a line for extracting sludge in the filtration and concentration device or at the bottom of the filtration and concentration device. Here, in the filtration and concentration device, since the operation is an intermittent operation, the concentrated sludge is temporarily stored in the filtration and concentration device, and the sludge is drawn out from the lower part. Therefore, the supernatant liquid stored in the upper part of the sludge when it is temporarily stored is pulled out together with the concentrated sludge. As a result, there is a problem similar to the problem in the first embodiment described above, but by using the screw-type separation device 1 according to this embodiment, when the sludge is pulled out, the supernatant liquid (supernatant water) is separated. Therefore, it is possible to stably increase the concentration of the concentrated sludge.

  Although the embodiments, examples, and modifications of the present invention have been described above, the embodiments are not limited by the contents of the embodiments and the like. Further, the above-mentioned components include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are in the so-called equivalent range. Further, the components described above can be appropriately combined. Furthermore, various omissions, substitutions, or changes of the components can be made without departing from the spirit of the above-described embodiments and the like.

DESCRIPTION OF SYMBOLS 1 Screw-type separation apparatus 10 Caging 12 Screw shaft 14 Screw blade part 16 1st screw blade 18 2nd screw blade 20 Partition part 30A Intermediate part 30B The other end 30C One end 32A Object input port 32B Object discharge port 32C Separated liquid discharge port KA Transport promotion section KB Object transport section KC Separate liquid transport section TA Transport promotion space TB Object transport space TC Separated liquid transport space

Claims (10)

A separated liquid outlet provided on one end side for discharging a separated liquid separated from the object by dehydration, an object outlet provided on the other end side for discharging the dehydrated object, and A cylindrical caging having an object input port provided between the separated liquid outlet and the object output port, into which the object is input,
A screw shaft provided inside the caging and extending along an extending direction that is a direction from the one end to the other end,
The pitch of the transport promotion section that extends spirally on the outer peripheral surface of the screw shaft and includes a portion that overlaps with the target object inlet when viewed from the radial direction of the caging, the pitch of the target object with respect to the transport promotion section. Screw blades shorter than the pitch of the object transport section, which is the section on the discharge port side,
Has,
By rotating the screw shaft, the object input from the object input port, dehydration while moving to the object discharge port through the transport promotion section and the object transport section, dewatering Discharging the target object through the target object outlet, and discharging the separated liquid from the separated liquid outlet,
Screw type separation device. The screw blade portion extends spirally on the outer peripheral surface of the screw shaft, and has a plurality of screw blades provided at predetermined intervals along the extending direction,
The screw type separation device according to claim 1, wherein the number of the screw blades in the transfer promotion section is larger than the number of the screw blades in the object transfer section.   3. The screw blade according to claim 1, wherein a pitch of the transport promotion section is shorter than a pitch of a separated liquid transport section that is a section on the separated liquid discharge port side with respect to the transport promotion section. 4. Screw type separation equipment. The screw blade portion extends spirally on the outer peripheral surface of the screw shaft, and has a plurality of screw blades provided at predetermined intervals along the extending direction,
The screw type separation device according to claim 3, wherein the number of the screw blades in the transfer promotion section is larger than the number of the screw blades in the separation liquid transfer section.   It is arranged between the target object inlet and the separated liquid outlet in the extending direction, and is provided so as to overlap a part of a region formed between the screw blades adjacent in the extending direction. The screw-type separation device according to any one of claims 1 to 4, further comprising a partition.   The partition wall portion, among the regions formed between the screw blades adjacent to each other in the extending direction, overlaps with a radially inner side region than a radially outer tip portion of the screw blade, and the inner region. The screw-type separation device according to claim 5, wherein an area outside in a radial direction is opened. A separated liquid outlet provided on one end side for discharging a separated liquid separated from the object by dehydration, an object outlet provided on the other end side for discharging the dehydrated object, and A cylindrical caging having an object input port provided between the separated liquid outlet and the object output port, into which the object is input,
A screw shaft provided inside the caging and extending along an extending direction that is a direction from the one end to the other end,
A screw blade portion extending spirally on the outer peripheral surface of the screw shaft,
A partition wall portion disposed between the object input port and the separated liquid discharge port in the extending direction, and provided so as to overlap a region formed between the screw blades adjacent in the extending direction. ,
Has,
By rotating the screw shaft, the object input from the object input port, dewatering while moving to the object discharge port, the dehydrated object is discharged from the object discharge port Discharging the separated liquid from the separated liquid discharge port,
Screw type separation device. A wastewater treatment system comprising: a solid-liquid separation tank that separates sludge from organic wastewater; and the screw-type separation device according to any one of claims 1 to 7.
A wastewater treatment system, wherein the screw-type separation device is configured to concentrate sludge discharged from the solid-liquid separation tank and return the separated liquid generated during the concentration of the sludge to the solid-liquid separation tank.   The wastewater treatment system according to claim 8, wherein the screw-type separation device is provided in the solid-liquid separation tank. A reaction tank that performs biological treatment on organic wastewater, a solid-liquid separation tank that separates sludge from the organic wastewater, and the screw-type separation device according to any one of claims 1 to 7, A wastewater treatment system comprising:
The screw-type separation device pulls out the sludge from the reaction tank, concentrates the sludge, returns the concentrated sludge to the reaction tank, and supplies the separated liquid generated during the concentration of the sludge to the solid-liquid separation tank. A wastewater treatment system that is configured to be capable.

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