Solid-liquid separation equipment

Abstract

To provide solid-liquid separation equipment having an unprecedented new effect.SOLUTION: Solid-liquid separation equipment where a solid contained in a received liquid is precipitated on a bottom comprises: a trough 4 disposed at the bottom; a pond bottom surface 3 disposed at both sides of the trough 4 in a width direction, inclined so as to go downward as it comes closer to the trough 4 and connected to a groove formation member at a lowermost part; a hollow space formation member 71 extending along the trough 4 in a longitudinal direction and having an opening 71a at a low part; a support member 72 supporting the space formation member 71 from above so as to freely adjust the position of the space formation member 71 in a vertical direction and the position in a width direction; and a discharge port 73a discharging a fluid in an internal space IS partitioned by the inner peripheral surface of the space formation member 71.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a solid-liquid separation system in which solids contained in a received liquid settle to the bottom. [Background technology]

[0002] For example, a sewage treatment plant may be provided with a solid-liquid separation facility such as a grit basin that receives wastewater such as sewage and rainwater, settles sand contained in the wastewater in a groove formed by a groove forming member arranged at the bottom of the basin, and then collects the sand accumulated in the groove in a sand collection pit and removes it from the wastewater. Some of these grit basins are equipped with a screw conveyor arranged in the groove and a drive device for driving the screw conveyor as a transfer mechanism for transferring the sand accumulated in the groove to the sand collection pit. As a settling basin equipped with this screw conveyor and drive device, for example, the one described in Patent Document 1 is known. Hereinafter, the transfer mechanism of the type described in Patent Document 1 is referred to as a screw conveyor type transfer mechanism. In recent years, the one described in Patent Document 2 has been developed as a settling basin equipped with a transfer mechanism that includes a transfer space forming member with an opening at the lower end and an outlet port for discharging a fluid into the transfer space formed by the transfer space forming member. Hereinafter, the transfer mechanism of the type described in Patent Document 2 is referred to as an ejector type transfer mechanism. The opening of the transfer space forming member in this ejector type transfer mechanism is provided in the groove where the sand settles, and functions as a suction port that sucks the sand accumulated in the groove into the transfer space by the flow of the fluid discharged from the discharge port. The sand sucked into the transfer space is then moved by the flow of the fluid toward the sand collection pit located downstream in the transfer direction.

[0003] In a settling basin equipped with a screw conveyor type transfer mechanism, the screw conveyor is driven to collect sand in a sand collection pit, so the drive device of the screw conveyor may wear out and require replacement. In addition, there is a possibility that dirt or other objects may get caught in the drive force transmission device, which is placed between the drive device and the screw conveyor and transmits the drive force to the screw conveyor, causing problems. Furthermore, since the drive force transmission device is placed in sewage, there is a possibility that it may be damaged by corrosion. As a result, there is a problem that the screw conveyor type transfer mechanism is expensive to maintain. On the other hand, in a settling basin equipped with an ejector type transfer mechanism, there is no drive device or drive force transmission device, so there are fewer problems and the maintenance costs are low.

[0004] In addition to grit basins, solid-liquid separation equipment, which separates liquid from solids by allowing solids contained in the received liquid (such as metal powder) to settle to the bottom, is also used in places other than sewage treatment plants. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-282607 A [Patent Document 2] JP 2015-361 A Summary of the Invention [Problem to be solved by the invention]

[0006] Recently, there has been a demand for solid-liquid separation equipment that can provide new effects that have never been achieved before.

[0007] In view of the above circumstances, an object of the present invention is to provide a solid-liquid separation facility that exhibits new effects never before seen. [Means for solving the problem]

[0008] The solid-liquid separation equipment of the present invention which solves the above-mentioned object comprises: A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, A groove forming member provided on the bottom portion; A pond bottom surface is provided on both sides of the groove forming member in the width direction, inclined downward as it approaches the groove forming member, and connected to the groove forming member at the lowest part; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; a support member that supports the space forming member from above so as to be able to adjust the vertical position and the width direction position of the space forming member; The space forming member has an inner circumferential surface, and the inner circumferential surface of the space forming member defines an internal space. The space forming member has an inner circumferential surface and a discharge port for discharging a fluid into the internal space.

[0009] In this solid-liquid separation equipment, The space forming member may be disposed within the groove formed by the groove forming member, have a cross-sectional shape in the shape of a circular arc, and the center of a circle that includes the arc as part of its circumference may be located below the boundary between an upper portion of the groove forming member and a lower portion of the groove forming member. Effect of the Invention

[0010] According to the present invention, it is possible to provide a solid-liquid separation facility that exhibits new effects never before achieved. [Brief description of the drawings]

[0011] [Figure 1] This is a plan view of a settling basin equipped with a screw conveyor type transport mechanism. [Diagram 2] 2 is a cross-sectional view of the grit chamber shown in FIG. 1 according to an embodiment of the present invention; [Diagram 3] 3(a) is a BB cross-sectional view of the settling basin shown in Fig. 2, and (b) is a CC cross-sectional view of the settling basin shown in Fig. 2. [Figure 4] This is a plan view of a settling basin equipped with an ejector-type transfer mechanism. [Diagram 5] 5 is an E-E cross-sectional view of the settling basin shown in FIG. 4. [Figure 6]6(a) is a DD cross-sectional view of the settling basin shown in Fig. 5. Also, (b) is an EE cross-sectional view of the settling basin shown in Fig. 5. [Figure 7] FIG. 6 is an F-F cross-sectional view of the settling basin shown in FIG. 5. [Figure 8] 1A to 1C are diagrams showing some examples in which at least a part of the inner circumferential surface 4a of the trough 4 is covered with a protective material. [Figure 9] 1 is a flowchart showing the procedure for modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A grit basin according to one embodiment of the present invention is a solid-liquid separation facility installed in a wastewater treatment plant, which settles sand contained in wastewater such as sewage and rainwater, and then moves the settled sand to a sand collection pit to remove it from the wastewater.

[0013] First, the settling basin equipped with a screw conveyor-type transfer mechanism before the repair will be described. Figure 1 is a plan view of the settling basin equipped with a screw conveyor-type transfer mechanism.

[0014] The grit basin 1 equipped with a screw conveyor-type transfer mechanism shown in FIG. 1 receives wastewater such as sewage and rainwater from the right side in FIG. 1. The received wastewater slowly flows toward the left side in the grit basin 1 while the sand contained in the wastewater settles (see the straight arrow in FIG. 1). Hereinafter, the upstream side of the flow of the received wastewater will be simply referred to as the upstream side, and the downstream side of the flow of the wastewater will be simply referred to as the downstream side. At the upstream end of the grit basin 1, a dust remover (not shown) is provided to remove contaminants (sediment) larger than a predetermined size that are mixed in the wastewater that has flowed into the grit basin. At the upstream end of the grit basin 1, a gate (not shown) is also provided to select whether to receive or block wastewater in the grit basin 1. At the downstream side of the grit basin 1, a pump well (not shown) is provided to store the wastewater from which sand has been removed by the grit basin 1. A lifting pump is installed inside the pump well, and the wastewater drawn in by the lifting pump is sent to a sedimentation tank where the next stage of wastewater treatment is carried out.

[0015] As shown in FIG. 1, the settling basin 1 is a substantially rectangular basin in plan view, including a sand collection pit 2, a basin bottom surface 3, a trough 4, and a screw conveyor type transfer mechanism 5. Two beams 9 are provided at the top of the settling basin 1, which are hung in the short direction of the settling basin so as to block a part of the settling basin 1. The sand collection pit 2 is provided at the downstream part of the bottom of the settling basin 1. The sand collection pit 2 is provided with a sand lifting pump (not shown) that conveys sand in the sand collection pit 2 out of the basin. The bottom surface 3 is a surface formed on the left and right sides of the basin width direction upstream of the sand collection pit 2, and is composed of a surface of concrete poured into the bottom of the settling basin 1. The trough 4 is provided at the upstream side of the sand collection pit 2, in the center of the basin width direction of the settling basin 1 at the bottom of the basin. The trough 4 in this embodiment corresponds to an example of a groove forming member. The pond bottom 3 is inclined downward from both sides in the pond width direction toward the trough 4, and is connected to the trough 4 at its lowest point. The trough 4 forms a groove 41 that opens upward. The longitudinal direction of the trough 4, i.e., the longitudinal direction of the groove 41, coincides with the longitudinal direction of the grit basin 1. In this embodiment, the longitudinal length of the trough 4 is 5 m. The downstream end of the trough 4 is connected to the sand collection pit 2. Most of the sand in the wastewater that flows into the grit basin 1 settles toward the sand collection pit 2, the pond bottom 3, or the trough 4. The sand that settles toward the pond bottom 3 slides down the inclined pond bottom 3 and accumulates in the groove 41.

[0016] The liner 42 is installed on the inner peripheral surface 4a of the trough 4 at the longitudinal center of the groove 41. The liner 42 is composed of a liner base 421 and a liner trough 422. The liner base 421 is composed of a high tensile steel plate having a plate thickness of 6 mm. The liner trough 422 is formed of a high tensile steel plate having a plate thickness of 12 mm. The liner base 421 and the liner trough 422 may be formed of other materials such as resin having high wear resistance, or one of them. The liner trough 422 is fixed to the liner base 421. The liner base 421 is provided with eight long holes 421a formed long in the vertical direction. The liner 42 is detachably attached to the pond bottom surface 3 by passing through the long holes 421a and screwing bolts (not shown) into the pond bottom surface 3. The long holes 421a are provided in the vertical direction, so that the attachment position of the liner 42 in the vertical direction can be freely adjusted. The liner trough 422 is worn due to the screw conveyor 51, which will be described later in detail, bending and coming into contact with it. When the wear amount of the liner trough 422 exceeds a certain amount, the liner 42 can be replaced with a new one by removing the above-mentioned bolt.

[0017] Figure 2 is a cross-sectional view taken along line AA of the grit basin shown in Figure 1. Note that hatching showing the cross section of the trough is omitted in Figure 2. Also, in Figure 2, the flow direction of the wastewater is indicated by a straight arrow.

[0018] As shown in FIG. 2, the screw conveyor-type transfer mechanism 5 includes a screw conveyor 51, a driving device 52, a driving force transmission device 53, a first coupling 54, and a second coupling 55. The driving device 52 is composed of a motor 521 and a reducer 522 arranged on the upstream beam 9, and a driving shaft 523 extending from the reducer 522 toward the bottom of the pond. By driving the motor 521, the driving shaft 523 rotates via the reducer 522. The driving shaft 523 is connected to the driving force transmission device 53 by the first coupling 54.

[0019] The driving force transmission device 53 is disposed in a transmission device installation space V1 at the bottom of the pond, which is connected to one end of the groove 41 in the longitudinal direction. The transmission device installation space V1 is a rectangular parallelepiped space provided upstream of the pond bottom surface 3 and the trough 4. The driving force transmission device 53 is a device having a function of converting the driving direction and a function of reducing speed. The driving force transmission device 53 converts a rotational motion about an axis extending in the vertical direction to a rotational motion about an axis extending in the longitudinal direction of the groove 41, while reducing the rotation speed. Some of the sand contained in the wastewater settles in the transmission device installation space V1. The driving force transmission device 53 may be buried in the settling sand, so the driving force transmission device 53 has a sand prevention function.

[0020] The driving force transmission device 53 is connected to one end of the screw conveyor 51 by the second coupling 55. Therefore, when the motor 521 is driven, the screw conveyor 51 rotates via the driving force transmission device 53 and the like. The screw conveyor 51 is a hollow shaft arranged in the groove 41 and having a spiral blade around it. The screw conveyor 51 may be configured as a solid shaft having a spiral blade around it. The axial direction of the screw conveyor 51 coincides with the longitudinal direction of the groove 41. The other end of the screw conveyor 51 protrudes slightly into the sand collection pit 2. The other end is supported by a bearing 511 arranged at a predetermined position. The bearing 511 is supported by a support shaft 512 that is hung between the left and right side walls of the grit basin 1 and fixed to the side walls by a bolt (not shown). When the screw conveyor 51 rotates, the blades around the screw conveyor 51 push the sand accumulated in the groove 41 toward the sand collection pit 2. As a result, the sand accumulated in the groove 41 is transferred to the sand collection pit 2. That is, the direction from the right side to the left side in Fig. 2 is the direction in which the sand is transferred.

[0021] Figure 3(a) is a BB cross-sectional view of the settling basin shown in Figure 2. Also, Figure 3(b) is a CC cross-sectional view of the settling basin shown in Figure 2. In these figures, the direction from the back to the front of the figure is the direction of sand transport. Note that hatching showing the cross section of the trough has been omitted in Figures 3(a) and 3(b).

[0022] As shown in FIG. 3(a), the trough 4 is made of a concrete flume with a U-shaped cross section. The lower part of the trough 4 is formed as a 1 / 2 arc with an inner diameter of 338 mm, and the upper part is formed as a straight line spreading 2° outward in the groove width direction. The trough 4 is fixed to concrete poured into the bottom of the pond by three anchor bolts 411. The screw conveyor 51 has a blade that protrudes only a small part above the groove 41, but the rest is disposed within the groove 41. The outer diameter of the blade of the screw conveyor 51 is 320 mm. That is, the outer diameter of the screw conveyor 51 is slightly smaller than the inner diameter of the arc of the lower part of the trough 4. Therefore, a gap is formed between the blade of the screw conveyor 51 and the trough 4. The center of the shaft of the screw conveyor 51 is located 13 mm above the center of a circle that includes the arc of the lower part of the trough 4 as part of its circumference.

[0023] As described above, the liner 42 is installed on the inner peripheral surface 4a of the trough 4 at the longitudinal center of the groove 41. As shown in FIG. 3(b), the liner base 421 constituting the liner 42 covers the inner peripheral surface 4a of the trough 4, extends above the trough 4, and also covers the lower end portion of the pond bottom surface 3. In the longitudinal center of the groove 41 where the liner 42 is arranged, from the upper end of the trough 4 to the vicinity of the upper end of the liner base 421, the pond bottom surface 3 protrudes slightly toward the center compared to the other portion of the longitudinal center of the groove 41 shown in FIG. 3(a). In this protruding portion, the liner base 421 is detachably fixed to the pond bottom surface 3 by a bolt (not shown). The liner trough 422 is attached to the lower end inner peripheral surface of the liner base 421. The screw conveyor 51 may bend downward due to its own weight or a reaction force generated when transporting sand. When the deflection becomes large, the blades in the axial center of the screw conveyor 51 come into contact with the liner trough 422, suppressing further deflection. When the screw conveyor 51 rotates in this contact state, the liner trough 422 wears out. When the liner trough 422 wears out to a certain extent, maintenance can be easily performed by removing the above-mentioned bolts and replacing the liner 42.

[0024] Next, we will explain the renovated settling basin equipped with an ejector-type transfer mechanism. The sand collection pit 2, basin bottom 3, trough 4, and beam 9 are the same as those of the settling basin 1 equipped with the screw conveyor-type transfer mechanism 5 before the renovation, so we will use the same symbols as before and omit the explanation for them.

[0025] FIG. 4 is a plan view of a settling basin equipped with an ejector-type transfer mechanism. In FIG. 4, the beams at the top of the settling basin are omitted in order to show the structure of the bottom of the settling basin. FIG. 5 is an E-E cross-sectional view of the settling basin shown in FIG. 4. In FIG. 5, hatching showing the cross section of the trough is omitted. In FIG. 4 and FIG. 5, the direction from the right to the left of the figure is the direction of sand transfer. In FIG. 4 and FIG. 5, the flow direction of the wastewater is indicated by a straight arrow.

[0026] As shown in FIG. 4, the renovated settling basin 10 is provided with an ejector-type transfer mechanism 7 in place of the screw conveyor-type transfer mechanism 5 of the settling basin 1 shown in FIGS. 1 to 3. The ejector-type transfer mechanism 7 has a space forming member 71, a support member 72, a nozzle 73, and a nozzle pipe 74. The space forming member 71 is a hollow, elongated member with an opening at the bottom, and extends along the longitudinal direction of the groove 41. The length of the space forming member 71 in the extension direction is 5.05 m, and one end on the upstream side coincides with one end of the trough 4. Therefore, the other end of the space forming member 71 is formed 0.05 m longer downstream than the other end of the trough 4, and the space forming member 71 protrudes into the sand collecting pit 2 by that length. The space forming member 71 has a sub-space forming portion 712 and a main space forming portion 711 provided on one end side. The cross-sectional shape of the auxiliary space forming portion 712 is the same as that of the main space forming portion 711. The auxiliary space forming portion 712 has a significantly shorter length in the extension direction than the main space forming portion 711. The auxiliary space forming portion 712 and the main space forming portion 711 are detachably fastened by a fastening member 713 consisting of a bolt and a nut. Four support members 72 are provided at equal intervals in the extension direction of the space forming member 71. The main space forming portion 711 is supported by the support members 72 so as to be positioned at a predetermined position in the groove 41. The auxiliary space forming portion 712 is not provided with a support member 72, and is supported by the main space forming portion 711 at a position continuous with the main space forming portion 711. An inner peripheral surface 711a (see FIG. 6(a)) of the main space forming portion 711 and an inner peripheral surface 712a (see FIG. 7) of the auxiliary space forming portion 712 are continuous in the extension direction of the space forming member 71. The tip portion of the nozzle 73 is disposed within an internal space IS (see FIG. 7) defined by the sub-space forming part 712. The sub-space forming part 712 is detachably fastened to the main space forming part 711, so that, for example, when the nozzle 73 becomes clogged, maintenance can be easily performed by removing the sub-space forming part 712 from the main space forming part 711 to expose the nozzle 73. The space forming member 71 and the support member 72 will be described in more detail later.

[0027] The nozzle 73 is formed by flattening a round pipe from the top and bottom, and a discharge port 73a is formed at the tip of the nozzle 73, which is long in the pond width direction and short in the top and bottom direction. Both ends of the extension direction of the space forming member 71 are open. The tip of the nozzle 73 is inserted into the internal space IS (see FIG. 7) from one of the open ends. The discharge port 73a is disposed in the internal space IS, and discharges a fluid toward the extension direction of the space forming member 71 when transferring sand. The fluid discharged from the discharge port 73a is wastewater stored in the grit basin 10, which is pumped up by a pump (not shown). However, water from another pond or water supply may be used as the fluid discharged from the discharge port 73a. The fluid may be a mixture of liquid and gas, but if the proportion of gas is too high, the flow of the discharged liquid is likely to be weakened, so even if a mixture is used, it is preferable that the proportion of gas is small. In this embodiment, the discharge pressure of the wastewater discharged from the discharge port 73a is 0.09 MPa, and the amount of water sprayed is 1500 liters per minute. However, the discharge pressure may be 0.05 MPa or more and 0.3 MPa or less, and the amount of water sprayed may be appropriately adjusted according to the length of the space forming member 71. In addition, the discharge flow velocity of the water is preferably 8 m / sec or more.

[0028] The nozzle pipe 74 is connected to the nozzle 73. This nozzle pipe 74 is for supplying the above-mentioned fluid to the nozzle 73. As shown in FIG. 5, a flow rate control valve 741 and an electric valve 742 are installed in the upstream portion of the nozzle pipe 74 in the supply direction. Note that FIG. 5 does not show the nozzle pipe 74 located upstream of the flow rate control valve 741 in the supply direction. A part of the nozzle 73 and the downstream end portion of the nozzle pipe 74 in the supply direction are arranged in the transmission device installation space V1 (see FIG. 2) in which the driving force transmission device 53 was installed before the repair. Hereinafter, the space in the transmission device installation space V1 in which the part of the nozzle 73 and the downstream end portion of the nozzle pipe 74 in the supply direction are arranged is referred to as the pipe installation space V3. The pipe installation space V3 is a rectangular parallelepiped smaller than the transmission device installation space V1. The pipe installation space V3 is connected to one end of the groove 41 in the longitudinal direction. As shown in FIG. 4, in the space that was the transmission device installation space V1, except for the piping installation space V3, an inclined surface 8 is formed that slopes downward as it approaches the piping installation space V3. It can also be said that this inclined surface 8 slopes downward as it approaches the groove 41. This inclined surface 8 is composed of an upstream inclined surface 81 and left and right inclined surfaces 82. The upstream inclined surface 81 is formed on the opposite side of the groove 41 with respect to the piping installation space V3 as a reference, and is connected to the upstream side of the piping installation space V3. The left and right inclined surfaces 82 are connected to both sides of the piping installation space V3 in the pond width direction. However, it is also possible to form only the upstream inclined surface 81 as the inclined surface 8 without forming the left and right inclined surfaces 82. When only the upstream inclined surface 81 is formed, it is desirable to extend the portion of the upstream inclined surface 81 that is outside the piping installation space V3 in the pond width direction to the pond bottom surface 3. The inclined surface 8 is composed of a surface of poured concrete. In FIG. 5, a cross section of the poured concrete is shown by cross-hatching. By forming the inclined surface 8, sand that has settled on the inclined surface 8 can slide down toward the pipe installation space V3. The inclination angle of the upstream inclined surface 81 and the inclination angles of the left and right inclined surfaces 82 are the same. In addition, the inclination angle of the inclined surface 8 in this embodiment is gentler than the inclination angle of the pond bottom surface 3 (see FIG. 7), but these inclination angles may all be the same.The sand that slides down the inclined surface 8 and accumulates below the piping installation space V3 is sucked into the internal space IS (see FIG. 7) when fluid is discharged from the discharge port 73a, and is carried toward the sand collection pit 2 by the flow of sewage discharged into the internal space IS. If the driving force transmission device 53 is removed and the transmission device installation space V1 is left as is, the sand that has accumulated on both sides of the transmission device installation space V1 in the pond width direction and at the upstream end of the transmission device installation space V1 is far from the discharge port 73a, so even if fluid is discharged from the discharge port 73a, it will not be sucked into the internal space IS and will remain there. By forming the inclined surface 8, it is possible to prevent sand from remaining at those ends.

[0029] Fig. 6(a) is a DD cross-sectional view of the settling basin shown in Fig. 5. Fig. 6(b) is an EE cross-sectional view of the settling basin shown in Fig. 5. Fig. 7 is an FF cross-sectional view of the settling basin shown in Fig. 5. In these figures, the direction from the back to the front of the figure is the direction of sand transport. In Fig. 7, the inclined surface is shown by a two-dot chain line, and hatching showing the cross section of concrete and the like that forms the settling basin is omitted. Note that hatching showing the cross section of the trough is omitted in Figs. 6(a), 6(b), and 7.

[0030] As shown in FIG. 6(a), the space forming member 71 has a cross-sectional shape of a 5 / 6 circle with an opening 71a at the lower end. That is, the cross-sectional shape of the space forming member 71 is an arc shape consisting of a part of a circle with the center 71c as the center point. This space forming member 71 is a stainless steel plate material with a plate thickness of 3 mm formed into an arc shape with an inner diameter of 150 mm. The width of the opening 71a is 80 mm. This opening 71a is provided over the entire length of the space forming member 71. In addition, this opening 71a is disposed opposite to the lower end portion of the inner circumferential surface 4a of the trough 4, and functions as a suction port that sucks in sand accumulated in the groove 41. The space forming member 71 divides the inside of the groove 41. The internal space IS formed by the space forming member 71 becomes a transfer space for transferring sand. Since the space forming member 71 has an arc-shaped cross section with the upper portion closed, the sand that settles in the settling basin 10 toward the upper portion of the space forming member 71 easily slides down the outer surface of the upper portion of the space forming member 71. The sand that slides down is deposited below the groove 41. In addition, the internal space IS below the center 71c of the space forming member 71 narrows in the pond width direction toward the lower opening 71a. This makes it difficult for sand sucked into the internal space IS to leak out from the internal space IS. As described above, the inner diameter of the arc of the lower portion of the trough 4 is 338 mm, so the inner diameter of the lower portion of the trough 4 is more than twice the inner diameter of the space forming member 71.

[0031] Supported parts 715 are fixed to the space forming member 71 at four positions at equal intervals in the extending direction of the space forming member 71. The supported parts 715 are welded to the outer peripheral surface 71b of the space forming member 71. The supported parts 715 are used in combination with a supporting member 72, which will be described later. One of the pairs of the supported parts 715 and the supporting member 72 is shown in FIG. 6(a). The other three supported parts 715 and the supporting members 72 have the same configuration, so the description of the other three supporting members 72 is omitted. The supported parts 715 are supported by the supporting member 72. The supporting member 72 has a supporting plate 721 and two supporting screw shafts 722. The supporting plate 721 is made of a stainless steel plate having an L-shaped cross section. The plate surface of the groove width direction central portion 721a in the lower portion of the support plate 721 is horizontal, and the plate surface of the groove width direction end portions 721b in the lower portion of the support plate 721 is inclined at the same inclination angle as the pond bottom surface 3. The support member 72 is fixed to the pond bottom surface 3 by bolts (not shown) passing through holes (not shown) provided in the groove width direction end portions 721b. Two long holes (not shown) long in the groove width direction are formed in the groove width direction central portion 721a, and the support screw shaft 722 passes through the long holes. The support screw shaft 722 is a shaft with a screw formed on the outer periphery of the shaft. Two nuts 723 screwed to the support screw shaft 722 sandwich the groove width direction central portion 721a from above and below. As a result, the support screw shaft 722 is fixed to the support plate 721 so that the position in the up-down direction and the position in the groove width direction can be freely adjusted. The support screw shaft 722 also passes through a hole (not shown) formed in the upper end portion of the supported portion 715. Two nuts 724 other than the nut 723 are screwed to the support screw shaft 722, and these nuts 724 sandwich the upper end portion of the supported portion 715 from above and below. As a result, the supported portion 715 is held on the support screw shaft 722 so that the position in the vertical direction can be adjusted. The space forming member 71 is fixed to the grit basin 1 by the supported portion 715 and the support member 72 so that the position in the vertical direction and the groove width direction can be adjusted. The support screw shaft 722 may be fixed to one of the supported portion 715 and the support member 72 by welding or the like. In addition, when it is not necessary to adjust the position of the space forming member 71 in the vertical direction and the groove width direction, the supported portion 715 and the support member 72 may be formed integrally.However, it is preferable to make the position where the space forming member 71 is arranged adjustable in the vertical direction and the groove width direction, since the position of the space forming member 71 in the height direction and the groove width direction can be set arbitrarily at the construction site when installing the space forming member 71. Note that only one of the vertical position and the groove width direction position of the space forming member 71 may be made adjustable. Conversely, the extension direction of the space forming member 71 may be made adjustable in addition to the vertical position and the groove width direction.

[0032] As described above, the cross-sectional shape of the trough 4 is such that the upper portion is formed in a straight line and the lower portion is formed in an arc shape. Also, as described above, the cross-sectional shape of the space forming member 71 is an arc shape having an opening 71a at the lower end portion. In this embodiment, the center 71c of a circle including the arc as a part of the circumference is disposed at a position lower than the boundary line 41b between the straight portion of the trough 4 and the arc portion of the trough 4. With this arrangement, the shortest distance between the outer peripheral surface 71b of the space forming member 71 and the inner peripheral surface 4a of the trough 4 becomes shorter as it approaches the opening 71a along the outer peripheral surface 71b of the space forming member 71 from the upper end of the space forming member 71. When wastewater is discharged from the discharge port 73a (see FIG. 5) into the internal space IS formed by the space forming member 71, a flow of wastewater is generated in the internal space IS. Then, a pressure difference is generated between the internal space IS and the outside of the space forming member 71 due to the flow of the fluid. That is, a negative pressure is generated in the internal space IS where the flow of the fluid is generated. The sand deposited in the groove 41 is sucked into the internal space IS from the opening 71a by the negative pressure. At that time, the shortest distance between the outer peripheral surface 71b of the space forming member 71 and the inner peripheral surface 4a of the trough 4 becomes shorter as it approaches the opening 71a, so the flow of the sand toward the opening 71a side at the lower end portion of the groove 41 becomes faster. This makes it easier to suck the sand from the opening 71a, and can prevent the sand from remaining in the groove 41. In addition, when the trough 4 has a U-shaped cross-sectional shape, a large amount of sand can be accumulated in the groove 41 compared to when it has an arc-shaped cross-sectional shape. The sand sucked into the internal space IS is transported toward the sand collection pit 2 by the flow of wastewater generated in the internal space IS.

[0033] As shown in Fig. 7, the center of the discharge port 73a and the center 71c of the space forming member 71 coincide with each other. Furthermore, the discharge direction of the wastewater discharged from the center of the discharge port 73a coincides with the extension direction of the space forming member 71. As a result, the wastewater discharged from the discharge port 73a is unlikely to diffuse in a radial direction perpendicular to the discharge direction. Furthermore, the space forming member 71 prevents the wastewater discharged from the discharge port 73a from diffusing in any direction other than the lower opening 71a, so that the flow of the wastewater is maintained within the internal space IS over a long distance.

[0034] As shown in Fig. 6(b), in the renovated grit basin 10, the liner 42 that was there before the renovation has been removed, and the inner circumferential surface 4a of the trough 4 is exposed also in the longitudinal center portion of the groove 41. Note that in the portion where the liner 42 was attached before the renovation, a protruding portion 3a that protrudes toward the center in the width direction of the pond is formed at the lower end portion of the pond bottom surface 3. In this embodiment, this protruding portion 3a is left in place, but it may be chipped off when the liner 42 is removed.

[0035] At least a part of the inner circumferential surface 4a of the trough 4 may be covered with a protective material.

[0036] FIG. 8 is a diagram showing some examples in which at least a part of the inner circumferential surface 4a of the trough 4 is covered with a protective material.

[0037] Figure 8(a-1) is a cross-sectional view of the bottom of the trough 4 taken along the longitudinal direction of the trough 4, and Figure 8(a-2) is a cross-sectional view of the trough 4 whose bottom is shown in Figure 8(a-1) taken in a direction intersecting the longitudinal direction.

[0038] In this example, the liner 42 has been removed, and no new arc-shaped groove forming member has been installed or concrete has been poured, but a protective material 61 is provided on the inner circumferential surface 4a of the trough 4. This protective material 61 is a resin protective layer applied to cover the entire surface of the inner circumferential surface 4a of the trough 4. Therefore, the protective material 61 is provided up to above the upper end of the space forming member 71. The protective material 61 may be provided higher than the trough 4. The protective material 61 is provided along the inner circumferential surface 4a of the trough 4 and has the same shape as the inner circumferential surface 4a. It is considered that the inner circumferential surface 4a of the trough 4 may be worn by the sand transferred by the ejector-type transfer mechanism 7, but by providing this protective material 61, it is possible to prevent the inner circumferential surface 4a of the trough 4 itself from being worn. If the protective material 61, which is a resin protective layer, is worn, a protective layer may be applied again. Repainting the protective layer is less expensive than replacing the trough 4, and providing the protective material 61 keeps maintenance costs down.

[0039] Figure 8(b-1) is also a cross-sectional view of the bottom of the trough 4 taken along the longitudinal direction of the trough 4, and Figure 8(b-2) is a cross-sectional view of the trough 4 whose bottom is shown in Figure 8(b-1) taken in a direction intersecting the longitudinal direction.

[0040] 8(b-1) and 8(b-2), the liner 42 is not removed, and no new arc-shaped groove forming members are installed or concrete is poured. The protective material 62 in this example is a high-tensile steel plate made of the same material as the liner trough 422, and is installed replaceably by, for example, bolting.

[0041] As shown in Fig. 8(b-2), in the portion where the liner 42 remains, a protective material 62 is provided to surround the liner trough 422, and the protective material 62 covers a part of the liner base 421. The thickness of the protective material 62 shown in Fig. 8(b-2) is the same as the thickness of the liner trough 422. Therefore, no difference in level is generated with the liner trough 422, and it is possible to prevent sand from remaining.

[0042] On the other hand, in the portion where the liner 42 is not provided, as shown in Fig. 8(b-1), the protective material 62 is provided on the inner peripheral surface 4a of the trough 4, and the protective material 62 shown in Fig. 8(b-1) has a thickness equal to the sum of the thickness of the liner base 421 and the thickness of the liner trough 422. Therefore, no step is generated with the liner 42.

[0043] In this example, the protective material 62 is provided only up to a position lower than the upper end of the space forming member 71, but it is still possible to prevent the inner peripheral surface 4a of the trough 4 from being worn down due to the transport of sand. When the steel plate protective material 62 becomes worn, it is sufficient to replace the protective material 62, and the cost of replacing the protective material 62 is less than the cost of replacing the trough 4, so that the maintenance cost is kept low even if the steel plate protective material 62 is provided.

[0044] The protective material 62 may be a stainless steel plate or the like instead of the high tensile steel plate. The protective material 62 may be provided only on the portion below the space forming member 71, or may be provided only on the portion facing the opening 71a of the space forming member 71.

[0045] Figure 8(c-1) is also a cross-sectional view of the bottom of the trough 4 taken along the longitudinal direction of the trough 4, and Figure 8(c-2) is a cross-sectional view of the trough 4 whose bottom is shown in Figure 8(c-1) taken in a direction intersecting the longitudinal direction.

[0046] 8(c-1) and 8(c-2), the liner 42 has not been removed, and no new arc-shaped groove forming members have been installed or concrete poured. The protective material 63 in this example is a lining material such as woven or nonwoven fabric impregnated with a hardening resin or a resin plate to which is bonded.

[0047] As shown in Fig. 8(c-2), in the portion where the liner 42 remains, a protective material 63 is provided from above the liner trough 422, and the liner trough 422 is covered by the protective material 63. The portion of the protective material 63 that covers the periphery of the edge of the liner trough 422 is gently inclined, with no sharp steps, making it possible to suppress the remaining of sand.

[0048] On the other hand, in the portion where the liner 42 is not provided, as shown in Fig. 8(c-1), the protective material 62 is provided on the inner peripheral surface 4a of the trough 4. Also, as shown in Fig. 8(c-1), the portion of the protective material 63 that covers the periphery of the edge of the liner 42 also has a gentle slope, with no sharp steps, making it possible to suppress the residue of sand.

[0049] In this example, the protective material 63 is provided only up to the same height as the upper end of the space forming member 71, but it is possible to prevent the inner peripheral surface 4a of the trough 4 from being worn down due to the transport of sand. If the lining protective material 63 becomes worn, it is sufficient to re-line the protective material 63, and the cost of lining the protective material 63 is less than the cost of replacing the trough 4, and the maintenance cost is kept low even if the lining protective material 62 is provided.

[0050] FIG. 9 is a flowchart showing the flow of the modification.

[0051] An example of a flow of renovating the settling basin 1 equipped with the screw conveyor type transfer mechanism 5 shown in Figs. 1 to 3 into the settling basin 10 equipped with the ejector type transfer mechanism 7 shown in Figs. 4 to 7 will be described with reference to Figs. 2, 5, and 9. In the renovation, the screw conveyor type transfer mechanism 5 shown in Fig. 2 is removed, but before this removal work, a gate (not shown) is closed to block wastewater flowing into the settling basin 1, and the water in the settling basin 1 is sucked up by a pump (not shown) to empty the settling basin 1 (pre-renovation work). Then, the second coupling 55 is loosened, the bearing 511 and the support shaft 512 are removed, and the screw conveyor 51 arranged in the groove 41 is pulled out from the second coupling 55 and removed (step S1). Next, the first coupling 54 is loosened, the motor 521 and the reducer 522 arranged on the beam 9 on the upstream side are removed, and the drive shaft 523 is pulled out from the first coupling 54 (step S2). Then, the driving force transmission device 53 is lifted to the ground together with the first coupling 54 and the second coupling 55 and removed (step S3). After that, the liner trough 422 installed in the longitudinal center of the groove 41 is removed together with the liner base 421 (step S4). This completes the removal work of the screw conveyor-type transfer mechanism 5. After the removal work, the cross-sectional area of ​​the groove 41 is expanded by the thickness of the liner trough 422 and the liner base 421 in the part where the liner trough 422 and the liner base 421 were installed. The cross-sectional area of ​​the groove 41 other than the part where the liner trough 422 and the liner base 421 were installed, such as the upstream end and the downstream end, is the same as before the repair. That is, the cross-sectional area of ​​the groove 41 after the screw conveyor 51 is removed is maintained to be equal to or larger than the cross-sectional area before the removal. While maintaining these cross-sectional areas, the space forming member 71, the nozzle 73, etc. are installed.

[0052] Next, the installation work of the ejector-type transfer mechanism 7 shown in FIG. 5 is performed. In this installation work, first, concrete is poured into the transmission device installation space V1 (see FIG. 2) except for the piping installation space V3 to form the upstream inclined surface 81 and the left and right inclined surfaces 82 (step S5). Then, the nozzle pipe 74 is installed from the ground to the piping installation space V3 along the side wall of the grit basin 10 and one of the left and right inclined surfaces 82, and the nozzle 73 having the discharge port 73a is attached to the end of the pipe on the piping installation space V3 side (step S6). Finally, the space forming member 71 is placed in the groove 41 from which the screw conveyor 51 has been removed, and the support member 72 is fixed to the pond bottom surface 3. Then, the space forming member 71 is fixed to the support member 72 while adjusting the height position of the space forming member 71 by the support screw shaft 722 as necessary (step S7). These steps S6 and S7 correspond to an example of a transfer mechanism installation process. By these steps S6 and S7, the discharge port 73a is placed in the internal space IS.

[0053] In this renovation, not only is the pond bottom surface 3 used as it is, but also a new member is not added to the groove 41 where the screw conveyor 51 was arranged, and the settling basin 1 equipped with the screw conveyor type transfer mechanism 5 is renovated to a settling basin 10 equipped with an ejector type transfer mechanism 7. That is, except for removing the liner 42 shown in FIG. 2 from the groove 41, the trough 4 is used as it is for the ejector type transfer mechanism 7. Therefore, the renovation to the settling basin 10 equipped with the ejector type transfer mechanism 7 can be performed at low cost. The liner 42 may be left without being removed. However, if the liner 42 remains, a step will be formed in the middle of the longitudinal direction of the groove 41, and there is a risk that the sand will be blocked by the step and will not be sucked into the internal space IS, and the sand will remain in the step portion. For this reason, it is desirable to remove the liner 42.

[0054] The driving force transmission device 53 may be left in the transmission device installation space V1 without being removed. However, it is preferable to remove the driving force transmission device 53, since the sand deposited upstream of the driving force transmission device 53 may be blocked by the driving force transmission device 53 and may be difficult to transport and may remain there for a long time. The driving device 52 may also be left in place without being removed. If it is left in place, the shape of the part of the nozzle pipe 74 that is on the ground needs to be changed from that shown in FIG. 5 etc. so as to avoid the driving device 52. In addition, the bearing 511 and the support shaft 512 may also be left in place without being removed, but it is preferable to remove the bearing 511, since it is located at a position that blocks a part of the downstream end of the space forming member 71 in the transport direction and may obstruct the flow of sewage flowing in the internal space IS.

[0055] In addition, although the flow chart showing the flow of the repair shown in FIG. 9 does not include the groove inner peripheral surface protection step, the step of providing the protective materials 61 to 63 described with reference to FIG. 8 may be performed before fixing the space forming member 71 (step S7). That is, the groove inner peripheral surface protection step of covering at least a part of the inner peripheral surface 4a of the trough 4 from which the screw conveyor 51 has been removed with the protective materials 61 to 63 may be performed. This groove inner peripheral surface protection step may be performed after performing step S2 and before performing step S7, and the timing of performing it is not limited. For example, it may be performed before performing step S6. In addition, there may be cases where the groove inner peripheral surface protection step is performed without performing step S4 of removing the liner 42. Even if the groove inner peripheral surface protection step is performed, it is not necessary to newly install an arc-shaped groove forming member or pour concrete, so that the repair of the solid-liquid separation equipment equipped with a screw conveyor type transfer mechanism to a solid-liquid separation equipment equipped with an ejector type transfer mechanism can be performed at low cost. Furthermore, the inner peripheral surface 4a of the trough 4 covered with the protective materials 61 to 63 shown in FIG. 8 is protected from wear caused by the movement of sand.

[0056] The present invention is not limited to the above-mentioned embodiment, and various modifications can be made within the scope of the claims. For example, the trough 4 is made of a concrete flume, but it may be formed by pouring concrete without using a concrete flume. In this case, the surface part of the concrete corresponds to the groove forming member. The driving force transmission device 53 may only have a function of changing the driving direction. Although the example in which the discharge port 73a is disposed in the internal space IS has been shown, the discharge port 73a may be outside the internal space IS as long as it is a position where the wastewater is discharged into the internal space IS. The discharge port 73a may be disposed at a position that coincides with the surface formed by one end of the space forming member 71 in the extension direction, that is, on the boundary surface of the end of the internal space IS in the extension direction. In this embodiment, the screw conveyor 51 is removed, then the driving force transmission device 53 is removed, the driving device 52 is removed, and then the liner 42 is removed, but the order of removal may be different, and some or all of the screw conveyor 51, the driving force transmission device 53, the driving device 52, and the liner 42 may be removed at the same time. Furthermore, the driving force transmission device 53, the driving device 52, and the liner 42 may be removed after the space forming member 71 is installed. In addition, the driving device 52 and the liner 42 may be removed after the nozzle pipe 74 and the nozzle 73 are installed or the inclined surface 8 is formed. In addition, in this embodiment, the nozzle pipe 74 and the nozzle 73 are installed after the inclined surface 8 is created, and then the space forming member 71 is arranged, but the order of these may be different. However, if the nozzle pipe 74 and the nozzle 73 are installed before the inclined surface 8 is formed, they may get in the way when the inclined surface 8 is formed, so it is desirable to install the nozzle pipe 74 and the nozzle 73 after the inclined surface 8 is formed. In addition, the space forming member 71, the nozzle pipe 74, and the nozzle 73 may be combined and integrated before installation and then installed. In addition, the space forming member 71 in this embodiment has a cross section in the shape of a circular arc, but it may also have a cross section in the shape of a U-shape with an open lower portion, for example.In addition, although the trough 4 in this embodiment has a U-shaped cross section, it may also have a V-shaped or an open-topped U-shaped cross section, or a cross-sectional shape consisting of only arcs (for example, a 1 / 2 arc shape, an arc shape less than 1 / 2 arc, or an arc shape greater than 1 / 2 arc).

[0057] Although the above description has been given using a grit basin installed in a wastewater treatment plant as an example, the present invention can also be applied to a sedimentation basin installed in a wastewater treatment plant. In addition, solid-liquid separation equipment that separates the liquid from the solid by allowing solids contained in the received liquid (such as metal powder) to settle to the bottom is used in places other than wastewater treatment plants, and the present invention can also be widely applied to general solid-liquid separation equipment.

[0058] The solid-liquid separation equipment explained so far is as follows: A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, a groove forming member provided on the bottom portion and having an arc-shaped inner circumferential surface; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member, The opening is disposed opposite to an arc-shaped inner circumferential surface of the groove forming member, The space forming member may be disposed in a groove formed by the groove forming member such that a shortest distance between an outer peripheral surface of the space forming member and an inner peripheral surface of the groove forming member becomes shorter from an upper end of the space forming member along the outer peripheral surface toward the opening.

[0059] This solid-liquid separation equipment includes at least solid-liquid separation equipment renovated by the first or second method for renovating solid-liquid separation equipment of the present invention.

[0060] According to this solid-liquid separation equipment, the flow of solids toward the opening side at the lower end portion of the groove becomes faster, so that the solids can be easily sucked from the opening and the solids can be prevented from remaining in the groove. Therefore, the solid-liquid separation equipment of the present invention is a solid-liquid separation equipment that provides new effects never before achieved.

[0061] The groove forming member may have an arc-shaped cross section or a substantially U-shaped cross section, but when the groove forming member has a substantially U-shaped cross section, a larger amount of solids can be deposited in the groove compared to when the groove forming member has an arc-shaped cross section.

[0062] In the solid-liquid separation equipment, the groove forming member has an inner circumferential surface having an upper portion formed in a straight line and an inner circumferential surface having a lower portion formed in an arc shape, The space forming member has a cross-sectional shape of a circular arc, The center of a circle that includes the arc as part of its circumference may be located below the boundary between the upper and lower portions of the groove forming member.

[0063] By doing so, the shortest distance between the space forming member and the groove forming member can be made shorter from the upper end of the space forming member along the outer circumferential surface of the space forming member toward the opening.

[0064] Incidentally, in recent years, it has become desirable to replace solid-liquid separation equipment equipped with a screw conveyor type transfer mechanism with a solid-liquid separation equipment equipped with an ejector type transfer mechanism at as low a cost as possible.

[0065] The first method for renovating solid-liquid separation equipment described above is as follows: A method for repairing a solid-liquid separation facility having a groove forming member at a bottom portion that forms a groove that is open upward, comprising: a screw conveyor removing step of removing the screw conveyor disposed in the groove; a transfer mechanism installation step of installing a hollow, elongated space forming member having an opening at a lower portion and a discharge port for discharging a fluid into an internal space defined by an inner peripheral surface of the space forming member in the groove from which the screw conveyor has been removed, The transport mechanism installation process is characterized in that it is a process of installing the space forming member and the discharge outlet while maintaining the cross-sectional area of ​​the groove after the screw conveyor has been removed equal to or greater than the cross-sectional area of ​​the groove before the screw conveyor was removed.

[0066] According to this first method of renovating solid-liquid separation equipment, the groove in which the screw conveyor was located is not required to be filled with arc-shaped groove forming members, concrete, etc., and the solids accumulated in the groove are transported by a transport mechanism equipped with the space forming member and the discharge outlet, so that solid-liquid separation equipment equipped with a screw conveyor-type transport mechanism can be inexpensively renovated to solid-liquid separation equipment equipped with an ejector-type transport mechanism.

[0067] The second method for upgrading solid-liquid separation equipment described above is as follows: A method for repairing a solid-liquid separation facility having a groove forming member at a bottom portion that forms a groove that is open upward, comprising: a screw conveyor removing step of removing the screw conveyor disposed in the groove; a groove inner surface protection step of covering at least a part of the inner surface of the groove from which the screw conveyor has been removed with a protective material; and a transfer mechanism installation process for installing a hollow, elongated space-forming member having an opening at the bottom and a discharge port for discharging a fluid into an internal space defined by the inner peripheral surface of the space-forming member in the groove from which the screw conveyor has been removed.

[0068] The protective material may be made of a material different from that of the groove forming member. In addition, it is preferable that the protective material is replaceable or reappliable. Alternatively, the protective material may have a shape that conforms to the inner circumferential surface of the groove. Furthermore, the protective material may have the same thickness as the liner described below.

[0069] According to this second method for renovating solid-liquid separation equipment, it is only necessary to cover at least a part of the inner circumferential surface of the groove in which the screw conveyor was disposed with the protective material, and there is no need to add an arc-shaped groove forming member, concrete, or the like to the groove. Therefore, this second method for renovating solid-liquid separation equipment can also be used to inexpensively renovate solid-liquid separation equipment equipped with a screw conveyor-type transfer mechanism to solid-liquid separation equipment equipped with an ejector-type transfer mechanism. Furthermore, the inner circumferential surface of the groove covered with the protective material is protected from wear caused by the movement of solids.

[0070] In addition, in the first and second methods of renovating solid-liquid separation equipment, the terms "placed in the groove" and "installed...in the groove" are concepts that include the case where a part of a component that was placed or a component to be installed protrudes outside the groove.

[0071] In addition, the first and second solid-liquid separation equipment renovation methods may include a transmission device removal step of removing a driving force transmission device for transmitting a driving force to the screw conveyor, which was arranged in a transmission device installation space connected to one longitudinal end of the groove.

[0072] If the driving force transmission device is left in place, there is a risk that the driving force transmission device will act as a barrier to the movement of solid objects, and solid objects accumulated around the driving force transmission device will not be able to move to the groove and will remain in the same position for a long period of time. By including the step of removing the driving force transmission device, it is possible to prevent solid objects accumulated around the position where the driving force transmission device was located from remaining in the same position for a long period of time.

[0073] Furthermore, the first and second methods of renovating solid-liquid separation equipment may include a step of forming an inclined surface in the transmission device installation space, the inclined surface inclining downward as it approaches the groove.

[0074] The inclined surface allows solids that have settled into the transmission device installation space to slide down toward the groove, so that the slid down solids can be transferred by the ejector-type transfer mechanism. Note that solids that have accumulated near the discharge port, even if they are accumulated upstream of the discharge port in the transfer direction, can be drawn into the internal space by discharging fluid from the discharge port, and can be transferred by the ejector-type transfer mechanism.

[0075] Furthermore, in the first and second methods for renovating solid-liquid separation equipment, the transfer mechanism installation process may be a process of installing the space forming member at a position where the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member along the outer peripheral surface toward the opening.

[0076] The groove may be formed with a wide groove width to match the size of the screw conveyor. By locating the space forming member at a position where the shortest distance becomes shorter as it approaches the opening, the flow of solids toward the opening at the lower end of the groove becomes faster than near the upper end of the space forming member, so that solids can be easily sucked in through the opening even when the groove width is wide. This makes it possible to prevent solids from being sucked in through the opening and remaining in the groove.

[0077] In addition, the first and second solid-liquid separation equipment renovation methods may include a liner removal step of removing a removable liner that is located in the longitudinal center portion of the groove and on the inner surface of the groove forming member, and that is subject to wear due to contact with the screw conveyor.

[0078] If the liner remains, a step will be created in the middle of the longitudinal direction of the groove by the liner, and there is a risk that the step will block the solid matter and cause it to remain in the step portion. By removing the liner, it is possible to prevent the solid matter from remaining in the step portion.

[0079] In the second method for renovating solid-liquid separation equipment, the liner removal step may be omitted, and the liner may be left in place, and the area of ​​the inner circumferential surface of the groove where the liner is not present may be covered with the protective material having the same thickness as the thickness of the liner. This also prevents steps caused by the liner from occurring, and prevents solids from remaining.

[0080] The solid-liquid separation equipment explained so far is as follows: A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, a groove forming member provided on the bottom portion and having an arc-shaped inner circumferential surface; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member, The opening is disposed opposite to an arc-shaped inner circumferential surface of the groove forming member, the space forming member is disposed in a groove formed by the groove forming member such that a shortest distance between an outer circumferential surface of the space forming member and an inner circumferential surface of the groove forming member becomes shorter from an upper end of the space forming member along the outer circumferential surface toward the opening, a piping installation space in which a piping is disposed, the piping being connected to one longitudinal end of the groove formed by the groove forming member and supplying a fluid to the discharge port; The pipe installation space is characterized in that it has an inclined surface which slopes downward as it approaches the pipe installation space on the opposite side to the groove with respect to the pipe installation space.

[0081] Since solids that have settled on the inclined surface can slide down toward the piping installation space, by discharging fluid from the discharge port, solids accumulated in the piping installation space can be sucked into the internal space and transported.

[0082] According to these, it is possible to provide a method for renovating solid-liquid separation equipment that requires low renovation costs, and solid-liquid separation equipment that has been renovated by the renovation method and has new effects that have never been seen before.

[0083] In addition, the solid-liquid separation equipment explained so far is as follows: A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, A groove forming member provided on the bottom portion; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member, an upper portion of an inner peripheral surface of the groove forming member is formed in a straight line, and a lower portion of the inner peripheral surface of the groove forming member is formed in a 1 / 2 arc shape; The opening is disposed opposite to an arc-shaped inner circumferential surface of the groove forming member, The space forming member is disposed in a groove formed by the groove forming member such that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member along the outer peripheral surface of the space forming member toward the opening, and has a cross-sectional shape of an arc, with the center of a circle that includes the arc as part of its circumference being located below the boundary between the upper and lower parts of the groove forming member.

[0084] In this solid-liquid separation equipment, The groove forming member may be formed so that the upper portion is linearly shaped and spreads outward in the groove width direction.

[0085] The solid-liquid separation equipment explained so far is as follows: A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, A groove forming member provided on the bottom portion; A pond bottom surface is provided on both sides of the groove forming member in the width direction, inclined downward as it approaches the groove forming member, and connected to the groove forming member at the lowest part; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; A support member that is stretched across the bottom surface of the pond and has both ends fixed to the bottom surface of the pond, and supports the space forming member from above; a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member, an upper portion of an inner peripheral surface of the groove forming member is formed in a straight line, and a lower portion of the inner peripheral surface of the groove forming member is formed in a 1 / 2 arc shape; The opening is disposed opposite to an arc-shaped inner circumferential surface of the groove forming member, The space forming member is disposed in a groove formed by the groove forming member such that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member along the outer peripheral surface of the space forming member toward the opening, and has a cross-sectional shape of an arc, with the center of a circle that includes the arc as part of its circumference being located below the boundary between the upper and lower parts of the groove forming member.

[0086] In this solid-liquid separation equipment, The space forming member may be supported by the support member so that its position in the up-down direction can be freely adjusted. [Explanation of symbols]

[0087] 1,10 Grit chamber 4 Trough 61, 62, 63 Protective materials 8 Slope 41 Groove 42 Liner 51 Screw Conveyor 53 Driving force transmission device 71 Space forming members 71a aperture 73a Discharge port IS interior space

Claims

[Claim 1] A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom, A groove forming member provided on the bottom portion; A pond bottom surface is provided on both sides of the groove forming member in the width direction, inclined downward as it approaches the groove forming member, and connected to the groove forming member at the lowest part; a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at a lower portion; a support member that supports the space forming member from above so as to be able to adjust the vertical position and the width direction position of the space forming member; a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member, The solid-liquid separation equipment is characterized in that the space forming member is placed in the groove formed by the groove forming member, has a cross-sectional shape of an arc, and the center of a circle that includes the arc as part of its circumference is located below the boundary between an upper part of the groove forming member and a lower part of the groove forming member.

Images