Solid-liquid separation equipment
The apparatus addresses maintenance challenges by using detachable space-forming members with gap-free connections, ensuring efficient and reliable solid-liquid separation.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- AQUAINTECH CORP
- Filing Date
- 2024-10-29
- Publication Date
- 2026-05-15
Smart Images
Figure 2026078614000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a solid-liquid separation facility provided with a groove at the bottom where contaminants contained in the received liquid settle, and for transferring the settled contaminants.
Background Art
[0002] In sewage treatment facilities, solid-liquid separation facilities such as grit chambers and sedimentation tanks are arranged. A grit chamber receives sewage such as sewage or rainwater, settles the sand contained in the sewage, transfers the sand deposited on the bottom surface to a grit sump, and removes the sand collected in the grit sump by a sand lift pump. Further, a sedimentation tank receives the sewage from which sand has been removed in the grit chamber, settles the sludge contained in the received sewage, transfers the sludge deposited on the bottom surface to a sludge pit, and removes the sludge collected in the sludge pit by a sludge pump. Furthermore, various solid-liquid separation facilities are also used outside sewage treatment facilities. For example, facilities that transfer metal powder and the like contained in industrial wastewater to a predetermined accumulation section and remove the collected metal powder by a pump or the like, and facilities that transfer sediment and the like that have flowed into a reservoir such as a dam lake to a predetermined accumulation section and remove the collected sediment and the like by a pump or the like. Hereinafter, sand, sludge, metal powder contained in industrial wastewater, or sediment that flows into a reservoir together with water, and solids separated from the liquid by a solid-liquid separation facility may be referred to as contaminants.
[0003] As a solid-liquid separation facility for transferring contaminants toward an accumulation section in a solid-liquid separation facility, there is known one that attempts to transfer contaminants by discharging a fluid from a discharge port provided on the upstream side in the transfer direction toward the deposited contaminants. In this solid-liquid separation facility, the deposited contaminants may be lifted up by the discharged fluid. On the other hand, if the amount of the fluid discharged from the discharge port is reduced in order to suppress the lifting of the contaminants, there is a possibility that the contaminants cannot be sufficiently transferred.
[0004] In response to this, a solid-liquid separation system has been proposed that transports contaminants while suppressing turbulence by providing a space-forming member with an opening at the bottom and a discharge port for discharging fluid into the space formed by the space-forming member within a groove where the contaminants settle (see, for example, Patent Document 1). In this solid-liquid separation system, when fluid is discharged from the discharge port into the space formed by the space-forming member, a pressure difference is created between the inside and outside of the space-forming member, and the contaminants accumulated on the bottom surface of the groove are sucked into the space through the opening of the space-forming member. Furthermore, within that space, the sucked-in contaminants move downstream in the transport direction due to the fluid flow and are transported to the accumulation section. Since the contaminants moving within the space are less likely to leave the space-forming member where a pressure difference is created, leakage outside the space-forming member and turbulence of the contaminants are suppressed. Therefore, the contaminants can be transported while suppressing turbulence. The contaminants transported to the accumulation section are removed from the accumulation section by removal means such as a pump.
[0005] Incidentally, since the space-forming member is a long member that extends in the transport direction, depending on the length of the solid-liquid separation equipment, multiple space-forming members may be divided and connected in the transport direction, taking into consideration the transportability and rigidity of the space-forming member. Furthermore, in the solid-liquid separation equipment of Patent Document 1, an auxiliary space-forming member is provided near the end where the discharge port is located for the purpose of maintaining the discharge port, and the main space-forming member and the auxiliary space-forming member are separated and made into separate parts from the main space-forming member other than the part near the end. In this solid-liquid separation equipment of Patent Document 1, the auxiliary space-forming member is detachably attached to the support member that supports the main space-forming member, making maintenance such as removing contaminants when they clog the discharge port easier. Hereinafter, these divided individual space-forming members, auxiliary space-forming members, and main space-forming members may be referred to as divided space-forming members.
[0006] If there is a gap in the connection between the divided space-forming members, turbulence will occur in the fluid flow within the space at that connection point, weakening the fluid flow and preventing the transport of impurities over long distances. Furthermore, there is a risk that impurities may leak out of the space-forming members through the gap. In the space-forming member described in Patent Document 1, the main space-forming member is fixed to the support member by welding the outer circumferential surface of the extending end of the main space-forming member to the support member, the lower end of which is embedded in concrete. The main space-forming member and the auxiliary space-forming member are then connected without gaps by attaching a plate-shaped flange portion provided at the extending end of the auxiliary space-forming member to the support member using a fastening member consisting of bolts and nuts. [Prior art documents] [Patent Documents]
[0007] [Patent Document 1] Japanese Patent Publication No. 2016-140796 [Overview of the project] [Problems that the invention aims to solve]
[0008] However, in the space-forming member of the solid-liquid separation equipment described in Patent Document 1, the main space-forming member is welded to the support member, making it impossible to remove the main space-forming member from the groove at the bottom of the solid-liquid separation equipment. This presents a problem in that it is difficult to replace or maintain the space-forming member. As a countermeasure, it is conceivable to attach the main space-forming member to the side of the support member opposite to the side to which the auxiliary space-forming member is attached, using a fastening member. However, in this configuration, a gap equal to the thickness of the support member is created between the main space-forming member and the auxiliary space-forming member. As a result, as mentioned above, the fluid flow in the space is weakened at the connection point between the main space-forming member and the auxiliary space-forming member, and there is a risk that impurities may leak out of the space.
[0009] In view of the above circumstances, the present invention aims to provide a solid-liquid separation system that is easy to maintain. [Means for solving the problem]
[0010] The solid-liquid separation equipment of the present invention, which solves the above objectives, A solid-liquid separation apparatus is provided with a groove at the bottom for impurities contained in the received liquid to settle, and for transporting the settled impurities, A space-forming member that extends along the groove, with its upper end portion forming a closed space, and having a suction port formed below the upper end portion, spaced apart from the bottom surface of the groove, A discharge port for discharging fluid into the space toward the downstream side in the direction of transfer of the contaminants, A support member provided at the bottom for supporting the space-forming member, The space-forming member is provided with an attachment member for attaching it to the support member, The space-forming member is composed of a plurality of divided space-forming members connected in the transport direction, The mounting member is fixed to the end of the divided space forming member in the transport direction, The support member has a pair of mounting portions that are spaced wider than the width of the space forming member. The divided space forming member is characterized in that the mounting member is detachably attached to the mounting portion by a fastening member and is supported by the support member.
[0011] With this solid-liquid separation equipment, even if the divided space-forming members are connected without any gaps, the fastening by the fastening member can be released, allowing the divided space-forming members to be lifted upward through the gap. This makes it easy to replace and maintain the space-forming members, thus facilitating maintenance of the solid-liquid separation equipment.
[0012] Here, the groove may extend along the transport direction. The mounting member may connect the divided space forming members together. Alternatively, the mounting member may be fixed to the end of the divided space forming member, and the end faces of the divided space forming members may be brought together by butting the mounting members fixed to the connected divided space forming members together. Furthermore, the mounting member may be flange-shaped. At least one of the plurality of divided space forming members may have the mounting member fixed to each of its ends in the transport direction. At least a part of the mounted portion may be located within the groove and in the upper part of the groove. Also, the mounted portion may protrude toward the inside of the groove.
[0013] In this solid-liquid separation equipment, The groove-forming member that forms the groove is provided, The support member may be fixed to the groove-forming member.
[0014] This allows the space-forming member to be positioned precisely relative to the groove.
[0015] Furthermore, in this solid-liquid separation equipment, The adjacent dividing space forming members in the direction of transport may be detachably connected to each other by fastening the mounting members together with the fastening members.
[0016] By releasing the fastening by the aforementioned fastening member, the connection of the divided space forming member can be released and the divided space forming member can be removed from the mounting portion, making it easier to replace or maintain the divided space forming member. [Effects of the Invention]
[0017] According to the present invention, it is possible to provide solid-liquid separation equipment that is easy to maintain. [Brief explanation of the drawing]
[0018] [Figure 1] It is a plan view of a grit chamber corresponding to an embodiment of the present invention as seen from above. [Figure 2] It is a sectional view taken along line A-A of the grit chamber shown in FIG. 1. [Figure 3] (a) is a detailed view of part C enlarged from FIG. 2, and (b) is a sectional view taken along line D-D of FIG. (a). [Figure 4] (a) is a sectional view showing a space forming member and a first mounting member in the E-E section of FIG. 3(a), and (b) is a sectional view showing a groove forming member and a first support member in the E-E section of FIG. 3(a). [Figure 5] (a) is a sectional view showing a space forming member and a second mounting member in the F-F section of FIG. 3(a), and (b) is a sectional view showing a groove forming member and a second support member in the F-F section of FIG. 3(a). [Figure 6] (a) is a detailed view of part B enlarged from FIG. 1, and (b) is a sectional view taken along line G-G of FIG. (a). [Figure 7] It is a detailed view similar to FIG. 6(a) showing the state of attaching and detaching the divided space forming member.
Mode for Carrying Out the Invention
[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of this embodiment, a grit chamber will be described as an example of the solid-liquid separation equipment of the present invention. The grit chamber is arranged on the upstream side of the sewage treatment facility, and after settling the sand contained in sewage such as sewage or rainwater, the settled sand is transferred to a grit sump and removed from the sewage.
[0020] FIG. 1 is a plan view of a grit chamber 1 corresponding to an embodiment of the present invention as seen from above. Further, FIG. 2 is a sectional view taken along line A-A of the grit chamber 1 shown in FIG. 1. In FIG. 2, the water level WL of the grit chamber 1 is shown. The position of this water level WL changes in the range of, for example, 1 m or more and 5 m or less from the bottom depending on the amount of sewage flowing into the grit chamber 1.
[0021] As shown in Figure 1, the sedimentation basin 1 is a rectangular basin in plan view. Hereafter, the direction of the longer side of the sedimentation basin 1 will be referred to as the longitudinal direction, and the direction of the shorter side will be referred to as the basin width direction. In the sedimentation basin 1 shown in Figure 1, wastewater is received from the left side of the figure, and the received wastewater flows slowly toward the right side of the figure. This wastewater is an example of a liquid. In Figures 1 and 2, the direction of wastewater flow is indicated by white arrows. That is, the longitudinal direction of the sedimentation basin 1 is the direction of wastewater flow, and in Figures 1 and 2, the left side of the figure is the upstream side of the wastewater flow, and the right side is the downstream side of the wastewater flow.
[0022] At the bottom of the sedimentation basin 1, the upstream bottom 2a, the sand collection pit 3, and the downstream bottom 2b are formed in order from upstream to downstream. Hereafter, when it is not necessary to distinguish between the upstream bottom 2a and the downstream bottom 2b, they may be collectively referred to as bottom 2. The sand in the wastewater that flows into the sedimentation basin 1 settles in bottom 2 and sand collection pit 3. The sand that settles in bottom 2 is transported to sand collection pit 3, as described later, and collected in sand collection pit 3. That is, the direction from the longitudinal end of the sedimentation basin 1 toward sand collection pit 3 corresponds to the transport direction, and in the sedimentation basin 1 shown in Figures 1 and 2, the transport direction is to the right in the upstream bottom 2a and to the left in the downstream bottom 2b. In other words, the transport direction is along the longitudinal direction. Also, bottom 2 corresponds to an example of a bottom, and sand collection pit 3 corresponds to an example of an accumulation area. In addition, the sand in the wastewater that flows into sedimentation basin 1 is an example of the contaminants contained in the accepted liquid.
[0023] Two groove-forming members 21 are provided at the upstream pond bottom 2a, extending longitudinally and aligned in the direction of the pond width. Similarly, two groove-forming members 21 are provided at the downstream pond bottom 2b, extending longitudinally and aligned in the direction of the pond width. These groove-forming members 21 extend from the longitudinal end of the sedimentation basin 1 toward the sand collection pit 3 at the pond bottom 2. The groove-forming members 21 are shaped like a round pipe with the upper portion cut out, forming an upwardly opening groove S1 (see Figure 3). In this embodiment, each groove-forming member 21 has a total length of approximately 6 m.
[0024] The groove-forming member 21 is composed of three divided groove-forming members 211 connected in the transport direction. These three divided groove-forming members 211 are arranged so that their length in the extending direction increases sequentially from the upstream side in the transport direction to the downstream side in the transport direction. The number of divided groove-forming members 211 may be two or four or more. The lengths of the three divided groove-forming members 211 may be the same, or the length in the extending direction may be longer on the upstream side in the transport direction. Hereinafter, the groove-forming member 21 provided at the upstream pond bottom 2a may be referred to as the upstream groove-forming member 21a, and the groove-forming member 21 provided at the downstream pond bottom 2b may be referred to as the downstream groove-forming member 21b to distinguish them.
[0025] The upstream pond bottom 2a and the downstream pond bottom 2b are provided with inclined surfaces 22 that slope downward toward the groove forming member 21 from both sides in the pond width direction of the groove forming member 21. In this embodiment, the inclined surfaces 22 are formed by pouring concrete. These inclined surfaces 22 form an upstream ridge 22a between the two upstream groove forming members 21a. Similarly, a downstream ridge 22b is formed between the two downstream groove forming members 21b.
[0026] As shown in Figures 1 and 2, discharge nozzles 4, which will be described in more detail later, are positioned at the upstream ends in the transport direction of the upstream side groove forming member 21a and the downstream side groove forming member 21b. A water supply pipe 40 is connected to the rear end of the discharge nozzle 4. Water is supplied to the discharge nozzle 4 from a discharge water pump (not shown) via the water supply pipe 40.
[0027] The downstream ends of the upstream groove-forming member 21a and the downstream groove-forming member 21b are connected to the sand collection pit 3. A space-forming member 5 is placed in the groove S1 (see Figure 3) formed by the groove-forming member 21. This space-forming member 5 extends along the groove S1, and its downstream end in the transport direction protrudes into the interior of the sand collection pit 3. The space-forming member 5 is shaped like a round pipe with the lower part cut out. This space-forming member 5 partitions the inside of the groove S1, forming a space S2 (see Figure 3) with its upper end closed.
[0028] The space-forming member 5 is composed of three divided space-forming members 51 connected in the transport direction. The length of these three divided space-forming members 51 increases sequentially from the upstream side in the transport direction toward the downstream side. The length of the divided space-forming member 51 located in the middle in the transport direction is approximately the same as the length of the divided groove-forming member 211 located in the middle in the transport direction. Similarly, the length of the divided space-forming member 51 located downstream in the transport direction is approximately the same as the length of the divided groove-forming member 211 located downstream in the transport direction. Note that there may be multiple divided space-forming members 51, such as two or four or more. The lengths of the three divided space-forming members 51 may be the same, or the length in the transport direction may be longer on the upstream side. The groove-forming member 21 and the space-forming member 5 will be described in detail later.
[0029] As shown in Figure 1, a sand pump 31 is provided in the sand collection pit 3. This sand pump 31 transports the sand collected in the sand collection pit 3 to the outside of the sedimentation basin 1. The sand pump 31 is connected to a sand lifting pipe 32, and the sand drawn into the sand pump 31 from a suction port located near the bottom of the sand collection pit 3 is sent to the outside of the sedimentation basin 1 through the sand lifting pipe 32.
[0030] On both sides of the sand collection pit 3 in the direction of the pond width, stirring members 33 are provided that discharge water downwards toward the suction port of the sand pump 31. Each stirring member 33 has four stirring nozzles. These stirring members 33 discharge water from the stirring nozzles toward the sand accumulated below the suction port of the sand pump 31 and the sand accumulated near both ends of the sand collection pit 3 in the direction of the pond width, thereby stirring the accumulated sand, preventing the suction port of the sand pump 31 from becoming blocked and promoting the suction of sand by the sand pump 31.
[0031] Further downstream in the wastewater flow from the bottom 2b of the downstream pond, a pump well (not shown) is provided. The pump well stores the wastewater from which the sand has been removed. A water pump is installed inside the pump well, and the wastewater sucked up by the water pump is sent to a sedimentation tank (not shown).
[0032] Next, the configurations of the groove-forming member 21, discharge nozzle 4, and space-forming member 5 will be explained using Figures 3 to 6. The upstream pond bottom 2a and the downstream pond bottom 2b are configured symmetrically across the sand collection pit 3, and the groove-forming member 21, discharge nozzle 4, and space-forming member 5 are similarly configured symmetrically. Furthermore, the two groove-forming members 21, discharge nozzle 4, and space-forming member 5, which are aligned in the pond width direction, are formed symmetrically with respect to a vertical plane passing through the upstream ridge 22a and the downstream ridge 22b, which are located in the center of the pond width direction. Therefore, in the following explanation, the groove-forming member 21, discharge nozzle 4, and space-forming member 5 located on the upper side of the downstream pond bottom 2b in Figure 1 will be used as an example, and the explanations of the groove-forming member 21, discharge nozzle 4, and space-forming member 5 located on the lower side of the upstream pond bottom 2a and the downstream pond bottom 2b in Figure 1 may be omitted.
[0033] Figure 3(a) is an enlarged detailed view of section C in Figure 2, and (b) is a cross-sectional view of section DD in the same figure (a). In Figure 3(a), the left direction of the figure is the transport direction. In Figure 3(b), the left-right direction of the figure is the pond width direction, and the direction toward the front of the figure is the transport direction. Note that in Figure 3(a), the second fastening member 82 (see Figure 6), which will be described later, is omitted from the illustration.
[0034] As shown in Figures 3(a) and 3(b), the discharge nozzle 4 has a discharge port 4a formed at its tip for discharging water. This discharge nozzle 4 is formed by flattening a round pipe, with the flattened tip becoming the discharge port 4a. This discharge port 4a is an elongated hole shape formed by flattening the tip of a pipe-shaped tube with a diameter of 50 mm. By making the discharge port 4a such a flat shape, the flow velocity of the discharged water can be increased compared to a perfectly round shape. A pair of mounting pieces 41 are provided on the outer circumferential surface of the discharge nozzle 4, protruding outwards on both sides in the direction of the pond width.
[0035] Water supplied from the water supply pipe 40 to the discharge nozzle 4 is discharged from the discharge port 4a toward the downstream side in the transfer direction. In this embodiment, the discharge velocity of the water discharged from the discharge port 4a is set to 8 m / sec or more, and the discharge pressure is set to 0.05 MPa or more and 0.3 MPa or less. Furthermore, as will be described later, in this embodiment where the total length of the groove-forming member 21 is set to about 6 m, the flow rate of the water discharged from the discharge port 4a is adjusted to about 1500 liters per minute. Here, if the total length of the groove-forming member 21 is set to about 10 m, the flow rate of the water discharged from the discharge port 4a is adjusted to about 2000 liters per minute. Thus, the flow rate of the water discharged from the discharge port 4a can be adjusted appropriately according to the total length of the groove-forming member 21, etc. Note that the water discharged from the discharge port 4a may be wastewater received by a wastewater treatment plant, or a fluid other than wastewater, such as purified water, may be used.
[0036] As shown in Figure 3(a), the area where the discharge port 4a is located is provided with a divided groove forming member 211 which constitutes the upstream end in the transport direction of the groove forming member 21, and a divided space forming member 51 which constitutes the upstream end in the transport direction of the space forming member 5. The divided groove forming member 211 which constitutes the upstream end in the transport direction has a shape in which the upper part of a round pipe is cut out, similar to the other divided groove forming members 211, and the cross-sectional shape at the cut surface perpendicular to the transport direction is the same as that of the other divided groove forming members 211. However, the divided groove forming member 211 which constitutes the upstream end in the transport direction has a significantly shorter length in the transport direction compared to the other divided groove forming members 211. A pair of support pieces 2111 that protrude inward in the pond width direction are provided on the inner circumferential surface of the divided groove forming member 211. Note that this pair of support pieces 2111 is provided only on the divided groove forming member 211 which constitutes the upstream end in the transport direction, and not on the other divided groove forming members 211.
[0037] A first support member 61 is fixed by welding to the outer circumferential surface of the downstream end in the transport direction of the divided groove forming member 211. This first support member 61 is an example of a support member. The first support member 61 is also fixed to the outer circumferential surface of the downstream end in the transport direction of other divided groove forming members 211. The first support member 61 will be described in detail later.
[0038] The discharge nozzle 4 is fixed to the divided groove forming member 211 by a nozzle fastening member 2112, with the mounting piece 41 resting on the support piece 2111 of the divided groove forming member 211. As a result, the discharge nozzle 4 is positioned so that the discharge port 4a is inside the divided space forming member 51, and is supported by the divided space forming member 51 in a posture in which water is discharged from the discharge port 4a in a substantially horizontal direction toward the transfer direction.
[0039] The divided space forming member 51, which constitutes the upstream end in the transport direction, has a shape in which the lower part of a round pipe is cut out, similar to the other divided space forming members 51, and the cross-sectional shape at the cut surface perpendicular to the transport direction is the same as that of the other divided space forming members 51. However, the divided space forming member 51, which constitutes the upstream end in the transport direction, is significantly shorter in length in the transport direction than the other divided space forming members 51, and is also about half the length in length in the transport direction compared to the divided groove forming member 211. The radial center position of the divided space forming member 51 is approximately the same as the radial center position of the divided groove forming member 211.
[0040] A first mounting member 71 is fixed by welding to the outer circumferential surface of the downstream end in the transport direction of the divided space forming member 51. This first mounting member 71 is an example of a mounting member. The first mounting member 71 is also fixed to the outer circumferential surface of the downstream end in the transport direction of other divided space forming members 51. The first mounting member 71 is for connecting two divided space forming members 51 that are continuous in the transport direction, and is also for attaching the divided space forming members 51 to the first support member 61 and the second support member 62, which will be described later. The first mounting member 71 will be described in detail later.
[0041] As shown in Figure 3(b), the inclined surfaces 22 are provided on both sides in the width direction of the groove-forming member 21. The inclined surfaces 22 are connected to the edge of the groove-forming member 21 and are inclined to be located upward as they move away from the edge of the groove-forming member 21. In this embodiment, the inclination angle of the inclined surfaces 22 is 35 degrees. As described above, these inclined surfaces 22 are made of concrete and extend in the longitudinal direction between the longitudinal edges of the sedimentation basin 1 and the sand collection pit 3 (see Figure 1). The inclination angle of the inclined surfaces 22 is preferably between 15 degrees and 60 degrees. By making the inclined surface 22 15 degrees or more, the sand that settles toward the inclined surface 22 slides down the inclined surface 22 more easily, and the sand that slides down accumulates on the bottom surface of the groove S1 formed by the groove-forming member 21. The sand accumulated on the bottom surface 3c is transported toward the sand collection pit 3 by discharging water from the discharge port 4a, as will be described later. Therefore, most of the sand that settles towards the bottom of the pond 2 can be transported to the sand collection pit 3. On the other hand, at angles exceeding 60 degrees, there is a problem that the volume of the sedimentation basin 1 decreases, and the amount of wastewater that the sedimentation basin 1 can accept decreases.
[0042] When water is discharged into space S2 from the discharge port 4a, a pressure difference is created between the inside (space S2) and outside of the space-forming member 5. As a result, the sand accumulated on the bottom surface of the groove S1 is sucked into space S2 from the suction port 5a, as shown by the curved arrow in Figure 3(b), which will be described in more detail later. Furthermore, within space S2, the sucked-in sand is moved toward the sand collection pit 3 by the flow of water discharged from the discharge port 4a. Therefore, the space-forming member 5 functions as a transport path through which the sand sucked into space S2 is transported toward the downstream side in the direction of water discharge.
[0043] Figure 4(a) is a cross-sectional view showing the space-forming member 5 and the first mounting member 71 in the EE section of Figure 3(a).
[0044] As described above, the first mounting member 71 is a flange-shaped member fixed to the downstream end in the transport direction of each of the three divided space forming members 51. Furthermore, since the material and cross-sectional shape of the three divided space forming members 51 are all the same, the dimensions of the cross-sectional shape of the divided space forming member 51 are also the dimensions of the cross-sectional shape of the space forming member 5. As shown in Figure 4(a), the divided space forming member 51 is shaped like a stainless steel cylindrical body with an inner diameter of 150 mm and a plate thickness of about 3 mm, with approximately 1 / 6 of the lower part cut out. It has an arc-shaped inner circumferential surface and an arc-shaped outer circumferential surface, and has a suction port 5a that opens downwards. The opening length of this suction port 5a in the pond width direction is set to, for example, about 80 mm. The width L1 of the divided space forming member 51 in the pond width direction is 156 mm. The space S2 formed by the space forming member 5 narrows as it approaches the suction port 5a at the lower end portion connected to the suction port 5a. Because the suction port 5a is narrowed in this way, it becomes more difficult for the sand being transported within space S2 to escape from space S2. In addition, it becomes easier to maintain the flow of water within space S2, allowing the sand to be moved over a longer distance. The material and shape of the divided space forming member 51 are not limited to those described above, but are set appropriately according to the size and shape of the sedimentation basin 1.
[0045] The first mounting member 71 is a stainless steel plate with a rectangular lower section and a trapezoidal upper section. The lower section of the first mounting member 71 is hollowed out in a semicircular shape that coincides with the outer circumferential surface of the dividing space forming member 51, and the dividing space forming member 51 is fitted into this hollowed-out section. As a result, the first mounting member 71 is positioned above the cylindrical center of the dividing space forming member 51 and extends radially outward from the outer circumferential surface of the dividing space forming member 51. In other words, the first mounting member 71 extends in a direction perpendicular to the transport direction. If the first mounting member 71 extends below the cylindrical center of the dividing space forming member 51, it would be necessary to insert the dividing space forming member 51 into the first mounting member 71 and then fix it in place by welding or other means when attaching the first mounting member 71 to the dividing space forming member 51. In contrast, by configuring the first mounting member 71 to contact the divided space forming member 51 at a position above the cylindrical center of the divided space forming member 51, the first mounting member 71 can be fixed by abutting it against the divided space forming member 51 from above, thus simplifying manufacturing. The first mounting member 71 has four first mounting holes 71a formed through it in the thickness direction. Note that the material and shape of the first mounting member 71 are not limited to those described above, and are set appropriately according to the size and shape of the sedimentation tank 1. The first mounting member 71 is fixed to the divided space forming member 51 such that the downstream side of the first mounting member 71 in the transport direction is in the same plane as the downstream end face of the divided space forming member 51 in the transport direction.
[0046] Figure 4(b) is a cross-sectional view showing the groove-forming member 21 and the first support member 61 in the EE section of Figure 3(a). In Figure 4(b), the space-forming member 5 is shown by a thin dashed line to show its arrangement relationship with the space-forming member 5.
[0047] As described above, the first support member 61 is a flange-shaped member fixed to the outer circumferential surface of the downstream end in the transport direction of each of the three divided groove forming members 211. Furthermore, the material and cross-sectional shape of all three divided groove forming members 211 are identical. As shown in Figure 4(b), the divided groove forming member 211 is shaped like a stainless steel cylindrical body with an inner diameter of 300 mm and a plate thickness of 3 mm, with approximately the upper 1 / 3 cut out, and it opens upwards. Note that the cross-sectional shape of the divided groove forming member 211 in the pond width direction is not limited to an arc shape, but may be U-shaped, V-shaped, etc. Also, the material, inner diameter, and plate thickness of the divided groove forming member 211 are not limited to those described above, but are set appropriately according to the size and shape of the sedimentation basin 1.
[0048] The first support member 61 is a stainless steel plate positioned outside the dividing groove forming member 211, except for a pair of first mounting portions 611. The first support member 61 extends in a direction perpendicular to the transport direction. The portion of the first support member 61 positioned outside the dividing groove forming member 211 is embedded in the concrete that makes up the pond bottom. The second support member 62 is fixed to the pond bottom by this embedded portion. In Figure 4(b), the portion embedded in concrete is shown with cross-hatching. The inner portion of the first support member 61 is hollowed out in an arc shape that coincides with the outer surface of the dividing groove forming member 211, except for the pair of first mounting portions 611, and the dividing space forming member 51 is fitted into this hollowed-out portion and fixed by welding. In addition, four first connecting holes 61a that penetrate in the thickness direction are formed in the portion of the first support member 61 that is embedded in concrete.
[0049] A pair of first mounting portions 611 protrude from the upper end portion of the first support member 61 toward the inside of the groove S1. These first mounting portions 611 are an example of mounting portions. The pair of first mounting portions 611 are formed with a gap L2 in the pond width direction. This gap L2 is wider than the width L1 of the space forming member 5 in the pond width direction. Therefore, each of the divided space forming members 51 constituting the space forming member 5 can be lifted upward through this gap by removing them from the first mounting portion 611 and the second mounting portion 621 (see Figure 5(b)), as described later. In addition, each of the pair of first mounting portions 611 has a first mounting hole 611a that penetrates in the plate thickness direction. Note that the material and shape of the first support member 61 are not limited to those described above, and are appropriately set according to the size and shape of the sedimentation basin 1, under the condition that the gap L2 of the pair of first mounting portions 611 is wider than the width L1 of the space forming member 5 in the pond width direction.
[0050] Figure 5(a) is a cross-sectional view showing the space-forming member 5 and the second mounting member 72 in the FF cross-section of Figure 3(a).
[0051] As shown in Figure 5(a), the second mounting member 72 is flange-shaped and fixed to the upstream end in the transport direction of each of the two divided space forming members 51, excluding the divided space forming member 51 that constitutes the upstream end in the transport direction. The second mounting member 72 is for connecting the two divided space forming members 51 that are continuous in the transport direction, and is also for attaching the divided space forming members 51 to the first support member 61 and the second support member 62, which will be described later. This second mounting member 72 is an example of a mounting member. The second mounting member 72 is made of the same material and has the same shape as the first mounting member 71. Like the first mounting member 71, the second mounting member 72 has a semicircular cutout into which the divided space forming member 51 is fitted and extends radially outward from the divided space forming member 51. In addition, the second mounting member 72 has a second mounting hole 72a formed in the same position as the first mounting hole 71a of the first mounting member 71. Except for the fact that the first mounting hole 71a and the second mounting hole 72a are provided in the same position, the first mounting member 71 and the second mounting member 72 may be made of different materials or have different shapes. The second mounting member 72 is fixed to the divided space forming member 51 such that the surface of the second mounting member 72 on the upstream side in the transport direction is in the same plane as the end surface of the divided space forming member 51 on the upstream side in the transport direction.
[0052] Figure 5(b) is a cross-sectional view showing the groove-forming member 21 and the second support member 62 in the FF cross-section of Figure 3(a). In Figure 5(b), the space-forming member 5 is shown by a thin dashed line to show its arrangement relationship with the space-forming member 5.
[0053] The second support member 62 is flange-shaped and fixed to the outer circumferential surface of the upstream end in the transport direction of each of the two divided groove forming members 211, excluding the divided groove forming member 211 that constitutes the upstream end in the transport direction. This second support member 62 is an example of a support member. As shown in Figure 5(b), the second support member 62 is made of the same material and has the same shape as the first support member 61, except that it has two bent portions 622 that extend in the horizontal direction, and these identical shaped portions extend in a direction perpendicular to the transport direction. Therefore, the pair of second mounting portions 621 formed on the second support member 62 are formed with a gap L2 in the pond width direction. This second mounting portion 621 is an example of a mounting portion.
[0054] The second support member 62 is fixed to the bottom of the pond by a portion embedded in the concrete that makes up the bottom of the pond. In Figure 5(b), the portion embedded in the concrete is also shown with cross-hatching. The second support member 62 is also fixed to the bottom of the pond by a divided space forming member 51 fitted into an arc-shaped cutout. In addition, the second support member 62 has a second connecting hole 62a formed in the same position as the first connecting hole 61a of the first support member 61, and a second mounting hole 621a formed in the same position as the first mounting hole 611a of the first support member 61. The first support member 61 and the second support member 62 may be made of different materials or have different shapes, except that the distance L2 between the pair of second mounting portions 621 is wider than the width L1 of the space forming member 5, the first connecting hole 61a and the second connecting hole 62a are provided in the same position, and the first mounting hole 611a and the second mounting hole 621a are provided in the same position.
[0055] Figure 6(a) is an enlarged detailed view of section B in Figure 1, and Figure 6(b) is a cross-sectional view of section GG in Figure 1(a). In Figures 6(a) and 6(b), the concrete forming the bottom of the pond is shown with diagonal lines to indicate transparency through the concrete.
[0056] As shown in Figures 6(a) and 6(b), the segmented groove-forming members 211, which are continuous in the transport direction, are connected to each other by four sets of first fastening members 81, each consisting of bolts and nuts, with the downstream side of the first support member 61 in the transport direction and the upstream side of the second support member 62 in the transport direction in surface contact. The first fastening members 81 are fastened through the first connecting hole 61a (see Figure 4(b)) and the second connecting hole 62a (see Figure 5(b)) to connect the segmented groove-forming members 211 that are continuous in the transport direction. Furthermore, the groove-forming member 21, which is formed by connecting three segmented groove-forming members 211 in the transport direction, is fixed to the bottom of the pond by embedding the portions of the first support member 61 and the second support member 62 that are located outside the groove-forming member 21 into the concrete that makes up the bottom of the pond.
[0057] Furthermore, the divided space forming members 51 that are continuous in the transport direction are connected by two sets of second fastening members 82, each consisting of a bolt and a nut, with the downstream side of the first mounting member 71 in the transport direction and the upstream side of the second mounting member 72 in the transport direction in surface contact. The second fastening members 82 are fastened through the first mounting hole 71a (see Figure 4(a)) formed in the upper part of the first mounting hole 71a and the second mounting hole 72a (see Figure 5(a)) formed in the upper part of the second mounting hole 72a, thereby connecting the divided space forming members 51 in the transport direction in a way that allows for release. The second fastening members 82 may be omitted. However, connecting the divided space forming members 51 with the second fastening members 82 can make it easier to attach the divided space forming members 51 to the first support member 61 and the second support member 62, and can also strengthen the connection between the divided space forming members 51.
[0058] Furthermore, the divided space forming members 51, which are continuous in the transport direction, are detachably attached to the first support member 61 and the second support member 62 by two sets of third fastening members 83 consisting of bolts and nuts. The third fastening members 83 are fastened through the first mounting hole 611a (see Figure 4(b)), the second mounting hole 621a (see Figure 5(b)), the first mounting hole 71a formed lower than the first mounting hole 71a (see Figure 4(a)), and the second mounting hole 72a formed lower than the second mounting hole 72a (see Figure 5(a)). As a result, the divided space forming members 51 are detachably attached to the first support member 61 and the second support member 62 and supported by the first support member 61 and the second support member 62, and the divided space forming members 51 that are continuous in the transport direction are connected to each other. These third fastening members 83 are an example of fastening members. By bringing the downstream side surface of the first mounting member 71 in the transport direction and the upstream side surface of the second mounting member 72 in the transport direction into surface contact, the end faces of the dividing space forming members 51 are brought into contact, and the dividing space forming members 51 are connected without any gaps between their end faces. In this embodiment, the first support member 61 and the second support member 62 that are in surface contact are positioned upstream of the first support member 61 and the second support member 62 in the transport direction, but the first support member 61 and the second support member 62 that are in surface contact may also be positioned downstream of the first support member 61 and the second support member 62 in the transport direction.
[0059] The connection structure between the second dividing groove forming member 211 from the upstream side in the transport direction and the dividing groove forming member 211 downstream of it, and the mounting structure of these dividing groove forming members 211 to the first support member 61 and the second support member 62, are the same as the mounting structure shown in Figure 6. However, in the dividing space forming member 51 furthest downstream in the transport direction, since the second support member 62 and the second mounting member 72 do not exist downstream in the transport direction, the first mounting member 71 is attached to and supported by the first support member 61 by the third fastening member 83 on its own.
[0060] Figure 7 is a detailed view similar to Figure 6(a), showing how the divided space forming member 51 is attached and detached. Note that the concrete forming the bottom of the pond is omitted from the illustration in Figure 7.
[0061] As shown in Figure 7, when removing the divided space forming member 51 from the bottom of the pond for maintenance or replacement, the fastening of the two sets of third fastening members 83 is released. This allows the divided space forming member 51 to be removed from the first support member 61 and the second support member 62. Next, the fastening of the two sets of second fastening members 82 is released. This also releases the connection between the divided space forming members 51. Alternatively, the fastening of the second fastening members 82 may be released first, followed by the fastening of the third fastening members 83. These operations are performed at the connection points of the upstream and downstream ends of the divided space forming member 51 to be maintained or replaced. Then, the target divided space forming member 51 can be lifted and removed from the bottom of the pond by passing it through the gap L2 between the pair of first mounting parts 611 of the first support member 61 and the gap L2 between the pair of second mounting parts 621 of the second support member 62. Note that the divided space forming member 51 constituting the upstream end in the transport direction can be removed from the bottom of the pond by releasing the fastening of the second fastening members 82 and third fastening members 83 at the downstream end. To fix the divided space forming member 51 to the bottom of the pond, simply follow the reverse procedure described above.
[0062] Furthermore, by removing the divided space forming member 51, which constitutes the upstream end in the transfer direction, from the first support plate 91 and the second support member 62, the discharge port 4a (see Figure 3) is exposed, allowing for maintenance such as removing any contaminants that have clogged the discharge port 4a. Additionally, by removing the divided space forming member 51, which constitutes the upstream end in the transfer direction, and detaching the discharge nozzle 4 (see Figure 3) from the water supply pipe 40 (see Figure 3), maintenance of the discharge port 4a can be made even easier.
[0063] In this embodiment of the sedimentation basin 1, the divided space forming members 51 can be connected to each other without gaps by using the first mounting member 71 and the second mounting member 72 to connect them. The divided space forming members 51 are then attached to the first support member 61 and the second support member 62 by attaching the first mounting member 71 and the second mounting member 72 to the first mounting portion 611 and the second mounting portion 621 detachably with the third fastening member 83. Therefore, the fastening by the third fastening member 83 can be released to lift the divided space forming members 51 upward through the gap L2 of the first mounting portion 611 and the gap L2 of the second mounting portion 621. This makes it easy to replace or maintain the divided space forming members 51, thus facilitating maintenance of the sedimentation basin 1.
[0064] The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims. For example, in the above embodiments, a sedimentation tank 1 having a groove-forming member 21 was described as an example of solid-liquid separation equipment, but the present invention may also be applied to other solid-liquid separation equipment in sewage treatment facilities, such as sedimentation tanks. For example, it may be applied to equipment that transports metal powder contained in factory wastewater to a predetermined collection area and removes the collected metal powder by a pump, or to equipment that transports sediment that has flowed into a reservoir such as a dam lake to a predetermined collection area and removes the collected sediment by a pump. In addition, although the spacing L2 of the first mounting portion 611 and the spacing L2 of the pair of second mounting portions 621 of the second support member 62 are the same, these spacings may be different as long as they are wider than the width L1 of the space-forming member 5.
[0065] Furthermore, even if a constituent element is included only in the description of the embodiments or each of the modified examples described above, that constituent element may be applied to the embodiments or other modified examples. [Explanation of Symbols]
[0066] 1 Sand basin (solid-liquid separation equipment) 2 Pond bottom (bottom) 4a Discharge port 5 Space-forming member 5a Inlet 51 Divided space forming member 61 First support member (support member) 62 Second support member (support member) 71. First mounting member (mounting member) 72. Second mounting member (mounting member) 83 Third fastening member (fastening member) 611 First mounting part (mounting part) 621 Second mounting part (mounting part) L1 width L2 Interval S1 groove S2 space
Claims
1. A solid-liquid separation apparatus is provided with a groove at the bottom for impurities contained in the received liquid to settle, and for transporting the settled impurities, A space-forming member that extends along the groove, with its upper end portion forming a closed space, and having a suction port formed below the upper end portion, spaced apart from the bottom surface of the groove, A discharge port for discharging fluid into the space toward the downstream side in the direction of transfer of the contaminants, A support member provided at the bottom for supporting the space-forming member, The space-forming member is provided with an attachment member for attaching it to the support member, The space-forming member is composed of a plurality of divided space-forming members connected in the transport direction, The mounting member is fixed to the end of the divided space forming member in the transport direction, The support member has a pair of mounting portions that are spaced wider than the width of the space forming member. The solid-liquid separation apparatus is characterized in that the divided space forming member is supported by the support member by the fastening member, which detachably attaches the mounting member to the mounting portion.
2. The groove-forming member that forms the groove is provided, The solid-liquid separation apparatus according to claim 1, characterized in that the support member is fixed to the groove-forming member.
3. The solid-liquid separation apparatus according to claim 1 or 2, characterized in that the adjacent dividing space forming members in the transport direction are detachably connected to each other by fastening the mounting members together with the fastening members.