JP2020032421A - Transfer system - Google Patents

Abstract

To provide a transfer system which transfers a mixture deposited on a deposition space in which the received underwater mixture is settled and inhibits the mixture from being rolled up while sufficiently moving the mixture.SOLUTION: A transfer system includes: a transfer space formation member 8 in which an upper end portion 82 forms a closed transfer space S2 and a suction port 81 spaced from a defining surface defining a deposition space S1 is provided below the upper end portion 82; and a discharge port 7 which discharges a fluid in the transfer space S2. In the transfer space formation member 8, the upper end portion 82 has an arc shape. The discharge port 7 discharges the fluid toward the downstream side in a mixture transfer direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transfer system in which a deposition space in which contaminants contained in received water settles is provided, and the contaminants deposited in the deposition space are transferred.

  The sedimentation basin and sedimentation basin of the sewage treatment system, which is one form of the wastewater treatment system, are provided with a sedimentation space in which the contaminants contained in the received water settle, and the contaminants accumulated in the sedimentation space are transferred. This is one of the transport systems to be used. Here, the sedimentation basin receives sewage such as sewage or rainwater, sinks the sand contained in the sewage into a trough provided at the lower part of the pond, and then collects the sand deposited on the trough. There is one that moves in a predetermined direction to remove collected sand from sewage. In addition, the sedimentation basin receives the sewage from which sand has been removed in the sedimentation basin, allows the sludge contained in the received sewage to settle in the lower part of the pond, and then moves in a predetermined direction to collect the sludge deposited in the lower part of the pond. Some move and remove collected sludge from sewage. In these sedimentation basins and sedimentation basins, sand and sludge deposited in troughs and sedimentary spaces provided at the lower part of the pond are moved toward the downstream in the discharge direction of the fluid by the flow of the fluid discharged from the discharge port, and collected. It is known that sand and sludge are discharged out of sewage by a pump. In the transfer using this fluid, the accumulated sand and sludge may be rolled up by the discharged fluid, and it is important to control how the sand and sludge are rolled up. Therefore, in the deposition space where the sludge settles, shield plates inclined downward toward the downstream in the discharge direction are arranged at intervals along the discharge direction to prevent sludge from rolling up. A sedimentation basin has been proposed (for example, see Patent Document 1).

Japanese Utility Model Publication No. 64-56807

  However, in the sedimentation basin described in Patent Literature 1, the shielding plate is disposed so as to face the discharge direction, so that the fluid discharged from the discharge port is blocked, and the sludge may not move sufficiently. is there. For this reason, if the discharge pressure of the discharge port is increased to sufficiently move the sludge, the sludge may be wound up along the shielding plate by the force of the discharged fluid. Further, even when the shielding plate described in Patent Literature 1 is arranged in a trough of a sand basin, there is a problem similar to that of Patent Literature 1. Further, besides a sand basin and a sedimentation basin, for example, it is conceivable to move a metal powder generated when processing a metal product in a factory or the like in a predetermined direction and discharge the collected metal powder. It is preferable to move the metal powder while suppressing the curling.

  The present invention has been made in view of the above circumstances, and has as its object to provide a transfer system that is devised to suppress the curling of a contaminant while sufficiently moving the contaminant.

The transfer system of the present invention for solving the above object is provided with a deposition space in which the contaminants contained in the received water settle, and is a transfer system for transferring the contaminants deposited in the deposition space,
A space forming member that forms a space in which an upper end portion is closed, and an opening that is provided below the upper end portion and that is separated from a defining surface that defines the deposition space;
A discharge port for discharging a fluid into the space,
The space forming member, wherein the upper end portion has an arc shape,
The discharge port discharges a fluid toward a downstream side in a transport direction of the contaminant.

Further, a deposition space in which the contaminant contained in the received water is settled is provided, and a transfer system for transferring the contaminant deposited in the deposition space,
A space forming member that forms a space in which an upper end portion is closed, and an opening that is provided below the upper end portion and that is separated from a defining surface that defines the deposition space;
A discharge port for discharging a fluid into the space,
A groove having the defining surface on the inner periphery and opening upward,
The space forming member, wherein the upper end portion is located below the opening of the groove,
The discharge port may discharge a fluid toward a downstream side in a transport direction of the contaminant.

Further, a deposition space in which the contaminant contained in the received water is settled is provided, and a transfer system for transferring the contaminant deposited in the deposition space,
A space forming member that forms a space in which an upper end portion is closed, and an opening that is provided below the upper end portion and that is separated from a defining surface that defines the deposition space;
A discharge port for discharging a fluid into the space,
A groove having the defining surface on the inner periphery and opening upward,
In the space forming member, the upper end portion may be located below an opening of the groove.

Further, a deposition space in which the contaminant contained in the received water is settled is provided, and a transfer system for transferring the contaminant deposited in the deposition space,
A transfer space forming member provided with a suction space separated from a defining surface that defines the deposition space, below the upper end portion, forming a transfer space in which an upper end portion is closed,
A discharge port for discharging a fluid into the transfer space,
The suction port is opened in the deposition space, the contaminant deposited in the deposition space, the function as an opening to suck into the transfer space by discharging the fluid from the discharge port,
The transfer space forming member, the contaminant sucked into the transfer space, functions as a path that moves toward the downstream in the discharge direction of the fluid by discharging the fluid from the discharge port,
The transfer space forming member may be a transfer system, wherein the upper end portion has an arc shape.

Further, in the transfer system, the delimiting surface is provided on the inner periphery, and the groove is opened upward.
The transfer space forming member may be such that the upper end portion is located below the opening of the groove.

  In this transfer system, the transfer space may be such that a lower end portion connected to the suction port becomes narrower as approaching the suction port.

Further, a deposition space in which the contaminant contained in the received water is settled is provided, and a transfer system for transferring the contaminant deposited in the deposition space,
A transfer space forming member having an upper end portion forming a closed transfer space, and a suction space provided below the upper end portion of the transfer space and separated from a defining surface that defines the deposition space,
A discharge port for discharging a fluid into the transfer space,
Discharging means,
The suction port is open in the deposition space, the contaminants deposited in the deposition space, function as an opening to suck into the transfer space by discharging the fluid from the discharge port,
The transfer space forming member, the contaminant sucked into the transfer space, functions as a path that moves toward the downstream in the discharge direction of the fluid by discharging the fluid from the discharge port,
The discharge means may discharge the contaminants transferred downstream in the discharge direction to outside of the received water.

  Here, the contaminant contained in the received water may be sand, sludge, or metal powder.

  Further, pits deeper than the above-mentioned deposition space may be provided. Further, the discharging means may be a pump or a device for discharging the contaminants transported downstream by the bucket or the like in the discharging direction to the outside of the received water. Further, the discharging means may be a siphon-type discharging device. When the discharging means is a pump, the pump may be provided in the pit or may be provided outside the pit. In the latter case, a mode may be provided in which a suction port for sucking the contaminants transferred downstream in the discharge direction is provided in the pit.

  Further, the transfer space forming member may have a C-shaped (arc-shaped), U-shaped, V-shaped, or U-shaped cross section.

  According to this transfer system, the contaminant deposited in the deposition space is sucked into the transfer space from the suction port by discharging the fluid from the discharge port into the transfer space. Here, since the suction port is open in the deposition space, the mixture deposited in the deposition space can be efficiently sucked into the transfer space. Furthermore, in the transfer space, the sucked contaminants move toward the downstream side in the discharge direction due to the flow of the fluid, and the contaminants transferred to the downstream side in the discharge direction are received by the discharge means. Is discharged out of the water. Even if the contaminant moving toward the downstream in the discharge direction in the transfer space leaks from the suction port on the downstream side in the discharge direction, the suction port is opened in the deposition space, Easy to stay in the deposition space. Therefore, according to this transfer system, it is possible to suppress the curling of the contaminant while sufficiently moving the contaminant.

In this transfer system, the discharging means is a pump,
The discharge port may discharge an amount of fluid equal to or less than the discharge amount of the pump.

  With this configuration, it is possible to prevent the amount of the received water from being excessively increased by the fluid discharged from the discharge port.

In this transfer system, the discharging means is a pump,
It is preferable that the discharge port discharges a fluid larger than 0 and 3.0 m3 / min or less.

  By doing so, it is possible to prevent the contaminants moving in the transfer space from accidentally coming out of the transfer space forming member due to the excessive amount of fluid discharged from the discharge port. It is possible to further suppress the curling of the contaminants. Further, there is no need to use a pump having a large capacity so that the discharge rate exceeds 3.0 m3 / min, and the cost of the pump can be reduced.

Further, in this transfer system, further provided is a screen member provided upstream of the deposition space, for preventing passage of a contaminant larger than the mesh width among contaminants mixed in the received water,
The suction port is open toward the bottom of the definition surface,
When the width direction is a direction perpendicular to the discharge direction in the horizontal plane,
The gap between the transfer space forming member and the defining surface, the vertical space between the suction port and the bottom, and the length of the suction port in the width direction are each in the range of the eye width to 125 mm or less. You may.

  Here, the demarcation surface may have an arc-shaped cross-section, and in this case, an arc-shaped cross section larger than 1/2 (for example, a 3/4 arc-shaped one) is preferable. . By doing so, it is possible to further suppress the contaminants deposited in the deposition space from rising outside the deposition space.

  According to this aspect, by setting each of the gap, the interval, and the length to be equal to or larger than the mesh width, a contaminant smaller than the mesh width that has passed through the screen is mixed with the transfer space forming member and the defining surface. Between the suction port and the bottom or the suction port. Here, the longer the vertical distance between the suction port and the bottom is, the more difficult it is for the contaminant to be sucked into the transfer space. Further, even if the length of the suction port in the width direction is too long, it is difficult for the contaminant to be sucked into the transfer space. For this reason, by setting the vertical interval between the suction port and the bottom portion and the length of the suction port in the width direction to 125 mm or less, it is possible to prevent the contaminants from being sucked into the transfer space more easily. Can be suppressed.

Further, in this transfer system, further provided is a screen member provided upstream of the deposition space, for preventing the passage of the contaminants larger than the mesh width among the contaminants mixed in the received water,
When the width direction is a direction perpendicular to the discharge direction in the horizontal plane,
The transfer space forming member is connected to one end of the defining surface in the width direction, while being separated from the other end of the defining surface in the width direction.
The gap between the transfer space forming member and the other end, the vertical space between the suction port and the bottom of the delimiting surface, and the length of the suction port in the width direction are each equal to or greater than the mesh width and equal to or less than 125 mm. May be adopted.

  Here, the transfer space forming member may be connected to the upper end portion on the one end side, or may be connected to an intermediate portion in the vertical direction on one end side.

  According to this aspect, by setting each of the gap, the interval, and the length to be equal to or larger than the mesh width, the contaminants smaller than the mesh width that has passed through the screen are mixed with the transfer space forming member and the other end. Side, between the suction port and the bottom, or clogging of the suction port. In addition, by setting the vertical space between the suction port and the bottom portion and the length of the suction port in the width direction to 125 mm or less, it is possible to prevent the contaminant from being easily sucked into the transfer space. be able to.

Further, in this transfer system, further provided is a screen member provided upstream of the deposition space, for preventing passage of a contaminant larger than the mesh width among contaminants mixed in the received water,
The suction port is open toward the bottom of the definition surface,
When the width direction is a direction perpendicular to the discharge direction in the horizontal plane,
The defining surface has a flat bottom, and an inclined portion connected to the bottom and causing the contaminant that has settled in the deposition space to face the bottom,
The bottom portion is such that the length in the width direction is longer than the length in the width direction of the suction port,
The vertical distance between the suction port and the bottom, and the length of the suction port in the width direction are each equal to or greater than the eye width and equal to or less than 125 mm,
The gap between the transfer space forming member and the inclined portion is equal to or larger than the eye width,
The distance in the width direction between the suction port and a portion where the oblique portion connects to the bottom may be 125 mm or less.

  According to this aspect, by setting each of the gap, the interval, and the length to be equal to or larger than the mesh width, a contaminant smaller than the mesh width that has passed through the screen is formed between the suction port and the bottom portion. The clogging between the suction port or the transfer space forming member and the inclined portion can be suppressed. In addition, by setting the vertical distance between the suction port and the bottom and the length of the suction port in the width direction to 125 mm or less, the contaminants deposited on the bottom are sucked into the transfer space. It is possible to suppress that it becomes difficult to be performed. Here, among the contaminants that have settled in the deposition space, the contaminants that have settled in the oblique portion are directed to the bottom by the oblique portion. For this reason, by setting the distance in the width direction between the portion where the oblique portion connects to the bottom portion and the suction port to 125 mm or less, the contaminants settled in the deposition space are sucked into the transfer space. Can be made easier.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a transfer system devised to suppress the curling of the contaminant while sufficiently moving the contaminant.

It is the top view which looked at the sand basin corresponding to one embodiment of the transfer system of the present invention from the upper part. It is AA sectional drawing of the sand basin shown in FIG. (A) is a BB sectional view in FIG. 2, and (b) is a CC sectional view in (a). (A) is sectional drawing which shows the aspect corresponding to FIG.3 (a) in the 1st modification of a sand basin, (b) is DD sectional drawing in (a). It is sectional drawing which shows the state which cut the sand basin of the 2nd modification in the width direction. It is the top view which looked at the settling pond which is a 2nd embodiment of the transfer system of the present invention from the upper part. It is EE sectional drawing of the sedimentation tank shown in FIG. It is FF sectional drawing of the sedimentation tank shown in FIG. (A) is an enlarged view showing a G part of FIG. 8 in an enlarged manner, and (b) is an enlarged view showing an H part of FIG. 8 in an enlarged manner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The sand basin, which is one embodiment of the transfer system of the present invention, is disposed on the upstream side of the sewage treatment system, and after settling sand contained in sewage such as sewage or rainwater, the settled sand is collected into a sand collecting pit. It is moved and removed from sewage.

  FIG. 1 is a plan view of a sand basin corresponding to one embodiment of the transfer system of the present invention as viewed from above, and FIG. 2 is a sectional view of the sand basin shown in FIG.

  As shown in FIG. 1, the sand basin 1 is a rectangular pond in plan view including a dust remover 2, a trough 3, a sand collecting pit 4, and a pump well 5. Hereinafter, the long side direction of the sand basin 1 may be referred to as a longitudinal direction, and the short side direction may be referred to as a width direction. The sand basin 1 shown in FIG. 1 receives sewage from the right side of the figure, and the received water slowly flows toward the left side of the figure (see the straight arrows shown in FIGS. 1 and 2). That is, the longitudinal direction of the sand basin is the direction of water flow, and in FIGS. 1 and 2, the right side of the figure is the upstream side of the water flow in the sand basin and the left side is the downstream side. In addition, water is discharged from a discharge port described later to the right side in FIGS. 1 and 2. That is, in FIGS. 1 and 2, the right side of the drawing is the downstream side in the discharge direction, and the left side is the upstream side in the discharge direction.

  The dust remover 2 is for removing the residue and the like from the contaminants mixed in the sewage flowing into the sedimentation basin 1, and is installed upstream of the trough 3. The dust remover 2 includes an endless chain 21, a plurality of rakes 22 attached to the endless chain 21 at intervals, and a filtration screen 23 submerged in water. The endless chain 21 is provided in an upright state on both sides in the width direction of the sand basin 1, and is wound around a ground sprocket 211 and a pond bottom sprocket 212 as shown in FIG. 2. I have. When the endless chain 21 is driven, the rake 22 enters and exits the water. The filtration screen 23 is arranged downstream of the endless chain 21. The filtration screen 23 has bars extending in the vertical direction arranged at a predetermined mesh width (for example, 25 mm to 75 mm), and blocks passage of contaminants having a size larger than the mesh width. That is, the filtration screen 23 corresponds to an example of a screen member according to the present invention. In the present embodiment, the mesh width of the filtration screen 23 is set to 75 mm. The contaminants blocked by the filter screen 23 are scooped up by the rake 22, and the contaminated matters are placed on a transport means such as a belt conveyor (not shown) on the ground side.

  On the downstream side of the dust remover 2, there is provided a sand collecting pit 4 for collecting the sand accumulated in the lower part 1a of the pond. A sand pump 41 is provided inside the sand collecting pit 4. The sand pump 41 is arranged near the bottom surface of the sand collecting pit 4 and transports the sand collected in the sand collecting pit 4 to the outside of the sand basin 1. That is, the sand pump 41 discharges the sand collected in the sand collecting pit 4 out of the water received in the sand basin 1. A sand pump 42 is connected to the sand pump 41. The sand and sewage sucked by the sand pump 41 are sent through a sand pipe 42 to a sand separator (not shown) provided outside the sand basin 1, and the sand and the sewage are separated by the sand separator. That is, the sand pump 41 corresponds to an example of a discharging means for discharging contaminants out of the received water according to the present invention. The sand pump 41 of this embodiment has a discharge amount (discharge amount) of 2.0 m3 / min.

  The trough 3 is provided between the sand collecting pit 4 and the pump well 5. That is, the trough 3 is provided downstream of the sand collecting pit 4 and upstream of the pump well 5. The trough 3 is a groove provided in the lower part 1a of the sand basin 1 (see FIG. 2). An inclined surface 6 is provided in the lower part 1a of the pond as described later, and a trough 3 is provided so as to be connected to the inclined surface 6. The sand in the sewage flowing into the sedimentation basin 1 sinks toward the lower part of the pond 1a and accumulates on the lower part of the pond 1a.

  The pump well 5 stores sewage from which sand has been removed. The pump well 5 is arranged on the most downstream side of the sand basin 1. Further, as shown in FIG. 2, the bottom of the pump well 5 is the deepest part in the sand basin 1. A pump 51 is provided inside the pump well 5. The pump 51 moves the sewage stored in the pump well 5 to the outside of the sand basin 1. The water pump 52 is connected to a water pump 52. The sewage sucked by the water pump 51 is sent to a sedimentation tank (not shown) through the water pipe 52. WL shown in FIG. 2 represents the water surface of the sewage. In addition, the position of the water surface WL changes in the range from, for example, 1 m to 5 m in height from the bottom of the trough 3 depending on the amount of sewage flowing into the sand basin 1.

  The trough 3 is a groove provided in the center of the sand basin 1 in the width direction as shown in FIG. 1 and extending in a predetermined direction from a position upstream of the pump well 5. The end of the trough 3 on the downstream side in the discharge direction is connected to the sand collecting pit 4, and the sand deposited in the trough 3 is moved to the sand collecting pit 4 by the flow of water discharged from a discharge port described later. .

  The sand basin 1 shown in FIGS. 1 and 2 also includes a transfer space forming member 8 in the trough 3. The entire length of the transfer space forming member 8 is the same as the total length of the trough 3, and the transfer space forming member 8 extends along the trough 3. A detailed description of the transfer space forming member 8 will be described later.

  FIG. 3A is a sectional view taken along line BB in FIG. In FIG. 3A, the horizontal direction of the figure is the width direction of the trough 3.

  FIG. 3A shows the lower part of the inclined surface 6 provided in the lower part 1a of the pond and the trough 3 provided so as to be connected to the inclined surface 6. As shown in FIG. 3A, the inclined surfaces 6 are provided on both sides in the width direction of the trough 3. The inclined surface 6 is made of concrete inclined at an angle of 45 degrees downward toward the trough 3, and extends in a longitudinal direction between a position on the upstream side of the pump well 5 and the sand collecting pit 4. I have. In addition, the inclination angle of the inclined surface 6 may be, for example, 30 degrees or 60 degrees.

  Further, as shown in FIG. 3A, the trough 3 is a groove having a cross-sectional shape of a 3/4 arc and having a total length of about 15 m, and is provided with a definition surface 31 defining a deposition space S1 on the inner periphery. I have. The trough 3 is formed by bending a plate made of stainless steel or the like, but may be formed of concrete integrally with the inclined surface 6. Further, the cross-sectional shape of the trough 3 is not limited to an arc shape, but may be a U shape, a V shape, or the like. The trough 3 shown in FIG. 3A has a shape in which a cylindrical body having a diameter of about 356 mm is cut off at an upper quarter (liquid level side), and is open upward. Hereinafter, the portion opening upward is referred to as an opening 3a of the trough 3. In the deposition space S1 in the trough 3, an upper end portion 3b connected to the upper end opening 3a becomes narrower as approaching the opening 3a. That is, the opening 3a of the trough 3 is an opening narrowed in the width direction orthogonal to the direction in which the trough 3 extends.

  The sand contained in the sewage flowing into the sedimentation basin 1 sinks to the pond lower part 1a in the process of the sewage flowing downstream. Of the sand that has settled in the lower part of the pond 1a, the sand that has settled on the inclined surface 6 flows further down the trough 3 along the inclined surface 6, and enters the deposition space S1 from the opening 3a of the trough 3. Therefore, the sand that has settled in the lower part of the pond 1a is first collected in the deposition space S1 of the trough 3.

  The transfer space forming member 8 shown in FIG. 3A has a cross section of a 3/4 arc. The transfer space forming member 8 is formed by forming a stainless steel plate material having a plate thickness of about 3 mm to 4 mm into an arc-shaped cross section. The transfer space forming member 8 shown in FIG. 3A has a shape in which a lower part (a lower part of the pond) of a cylindrical body having a diameter of about 156 mm is cut out, and the transfer surface forming member 8 has a demarcation surface 31 in the deposition space S1. It is open toward the bottom 31a. That is, the lower end of the transfer space forming member 8 is open toward the bottom 31a, and this open portion is hereinafter referred to as a suction port 81. The length L in the width direction of the trough 3 at the suction port 81 is set within the range of the eye width (here, 75 mm) of the screen member (here, the filtration screen 23) and 125 mm or less. In the embodiment, the length L is set to about 100 mm. Hereinafter, the length L of the trough 3 in the width direction of the suction port 81 may be simply referred to as the length L of the suction port. Further, the suction port 81 is separated from the delimiting surface 31 of the trough 3.

  The transfer space forming member 8 partitions the space in the trough 3 and forms a transfer space S2 in which a portion above the lower end is closed. Although the upper end portion 82 of the transfer space forming member 8 is closed, it has an arc shape and is inclined downward. Although the sand also settles on the transfer space forming member 8, the sand is difficult to accumulate because of the arc shape, and the sand that has settled on the transfer space forming member 8 passes along the arc-shaped side surface 80, It easily flows down toward the bottom 31a of the defining surface 31. Further, due to the arc-shaped side surface 80, the lower end portion of the transfer space S2 connected to the suction port 81 becomes narrower as approaching the suction port 81.

  Here, as shown in FIGS. 1 and 2, below the trough 3, support bases 91 are provided at intervals of about 5 m in the direction in which the trough 3 extends.

  FIG. 3B is a cross-sectional view taken along the line CC in FIG. In FIG. 3B, the horizontal direction of the figure is the direction in which the trough 3 extends, the right side of the figure is the upstream side (the sand collection pit 4 side), and the left side is the downstream side (the pump well 5 side).

  As shown in FIG. 3A, the lower end 83 of the transfer space forming member 8 on both sides of the suction port 81 is supported by a support base 91. The support base 91 is made of concrete provided on the bottom part 31 a that is the deepest part of the defining surface 31. As shown in FIG. 7B, the support base 91 has an upstream inclined surface 911 and a downstream inclined surface 912, and has a support portion 913 between the upstream inclined surface 911 and the downstream inclined surface 912. The lower end 83 of the transfer space forming member 8 is supported by the support portion 913. As shown in FIG. 9A, a horizontal surface 9131 is provided at the center in the width direction of the support portion 913, and both sides of the horizontal surface 9131 are inclined downward toward the trough 3.

  The transfer space forming member 8 shown in FIG. 3A has a vertical space C1 between the suction port 81 and the bottom 31a because the lower end 83 is supported by the support base 91. The interval C1 is also set in the range of the eye width (here, 75 mm) or more and 125 mm or less of the screen member (here, the filtration screen 23), similarly to the length L of the suction port 81. In the present embodiment, the center of the transfer space forming member 8 in the radial direction is located below the center of the trough 3 in the radial direction, and the interval C1 is set to about 100 mm.

  In the present embodiment, in the width direction of the trough 3, the center of the transfer space forming member 8 in the radial direction matches the center of the trough 3 in the radial direction, and the defining surface 31 of the trough 3 and the transfer space forming member 8 Of the screen member (here, the filtration screen 23) is at least equal to the eye width (here, 75 mm) even at the narrowest position. In the present embodiment, the gap C2 is about 80 mm even at the narrowest position. The length L of the suction port 81, the vertical distance C1 between the suction port 81 and the bottom 31a, and the gap C2 between the defining surface 31 and the transfer space forming member 8 are equal to or larger than the mesh width (here, 75 mm) of the filtration screen 23. Therefore, the contaminants that have passed through the upstream filtration screen 23 may be clogged between the suction port 81, the suction port 81 and the bottom portion 31a, or between the defining surface 31 and the transfer space forming member 8. Can be suppressed.

  Further, a discharge port 7 for discharging a fluid into the transfer space S2 is provided in the transfer space S2 in the transfer space forming member 8. The discharge port 7 has a long hole shape obtained by flattening the tip of a pipe-shaped water supply pipe 71 having a diameter of less than 50 mm. The maximum opening length of the discharge port 7 in the lateral direction (trough width direction) is about 60 mm or less. By making the discharge port 7 have such a flat shape, it is possible to secure a wider range in which the flow velocity is increased as compared with a case of a perfect circular shape. The discharge port 7 may be formed by flattening the distal end of a water supply pipe having a diameter of about 80 mm or less. As shown in FIG. 2, the water supply pipe 71 is connected to a transfer space forming member 8 from a water supply source (not shown) outside the sand basin 1. Further, as shown in FIG. 3A, the water supply pipe 71 extends downward along the inclined surface 6 to the vicinity of the opening 3 a of the trough 3, and then becomes substantially horizontal toward the center in the width direction of the trough 3. It extends and bends downward at the center of the trough 3 in the width direction, and then penetrates the transfer space forming member 8 and enters the transfer space S2.

  The portion 711 of the water supply pipe 71 that has entered the transfer space S2 extends downward to the horizontal surface 9231 of the support base 91, and is directed toward the upstream side (toward the sand collection pit 4) near the suction port 81 of the transfer space forming member 8. And is horizontally bent so as to be placed on a horizontal surface 9131. A rectangular anti-winding plate 95 is provided upright on the upstream side of the portion 711 (the sand collecting pit 4 side) of the water supply pipe 71 that has entered the transfer space S2. The upstream side of the L-shaped portion 712 which extends substantially horizontally toward the center of the trough 3 in the width direction and is bent downward at the center of the trough 3 in the width direction and extends downward to the transfer space forming member 8. On the (sand collecting pit 4 side), a second winding prevention plate 96 formed by bending a rectangular plate material into an L shape is attached. With these wrap prevention plates 95 and the second wrap prevention plate 96, a string-like contaminant (for example, hair or vinyl string) is added to the portion 711 or the L-shaped portion 712 of the water supply pipe 71 that has entered the transfer space S2. ) Is prevented from winding around. The portion of the water supply pipe 71 extending along the inclined surface 6 can be prevented from being wound by the string-shaped contaminant by contacting the inclined surface 6.

  The discharge port 7 of the present embodiment is located below the radial center of the transfer space forming member 8, and specifically, is slightly above the suction port 81, or substantially at the same height as the suction port 81. positioned. Water is discharged from the discharge port 7 in a horizontal direction or a substantially horizontal direction (see a right-pointing arrow in FIG. 3B). That is, in FIG. 3B, the right side of the figure is the downstream side in the ejection direction, and the left side of the figure is the upstream side in the ejection direction. The position of the discharge port 7 in the vertical direction may be the same as the radial center of the transfer space forming member 8 or may be higher than the radial center of the transfer space forming member 8. Here, the amount of water discharged from the discharge port 7 is set to be equal to or less than the discharge amount (here, 2.0 m3 / min) of the sand pump 41. By setting the amount of water discharged from the discharge port 7 to the discharge amount of the sand pump 41 or less, it is possible to prevent the amount of water stored in the sand basin 1 from being carelessly increased. Further, the amount of water discharged from the discharge port 7 is preferably set to be larger than 0 and 3.0 m3 / min or less. The discharge port 7 of the present embodiment is set so as to discharge about 1.5 m3 / min of water.

  As water is discharged from the discharge port 7 into the transfer space S2 of the transfer space forming member 8, the sand deposited in the deposition space S1 in the trough 3 becomes as indicated by the curved arrow shown in FIG. It is sucked into the transfer space S2 from the suction port 81. Here, since the suction port 81 is open in the deposition space S1, sand deposited in the deposition space S1 can be efficiently sucked into the transfer space S2. Further, even if the sand moving in the transfer space S2 toward the downstream side in the discharge direction leaks from the suction port 81 downstream in the discharge direction, the sand easily stays in the accumulation space S1. Further, as described above, since the length L of the suction port 81 is set to be within 125 mm, the sand accumulated in the deposition space S1 due to the length L being too long flows from the suction port 81 into the transfer space S2. It is possible to prevent the inhalation from becoming difficult. Further, since the vertical distance C1 between the suction port 81 and the bottom 31a is set within 125 mm, the distance C1 is too large, and the sand deposited in the deposition space S1 is hardly sucked into the transfer space S2. Can be suppressed. Further, in the transfer space S2, the sucked sand moves toward the downstream in the discharge direction (toward the sand collecting pit 4) due to the flow of the water discharged from the discharge port 7. As shown in FIG. 3, the suction port 81 is an opening narrowed in the width direction (a direction orthogonal to the extending direction of the transfer space forming member 8), and the transfer space S <b> 2 is a space expanded from the suction port 81. It is. Since the suction port 81 is a narrowed opening, sand moving in the transfer space S2 does not easily come out of the transfer space S2, and curling of the sand is further suppressed. Further, the flow of water in the transfer space S2 can be easily maintained, and the sand can be moved farther. Further, by setting the length L of the suction port 81 to 125 mm or less, the sand moving in the transfer space S2 is less likely to come out of the transfer space S2, and curling of the sand is further suppressed. Also, by setting the discharge amount of water from the discharge port 7 to 3.0 m3 / min or less, it is possible to make it difficult for sand moving in the transfer space S2 to come out of the transfer space S2.

  The structure of the discharge port 7 in the support base 91 described above is the same in any of the support bases 91 shown in FIG. 1 and FIG. 2 provided at intervals of about 5 m in the direction in which the trough 3 extends. Hereinafter, the discharge port 7 provided at the most upstream side in the discharge direction is referred to as an upstream discharge port, and the discharge port 7 provided at the most downstream side in the discharge direction is referred to as a downstream discharge port. The discharge port 7 provided between them may be referred to as an intermediate discharge port to be distinguished.

  In the sand basin 1 of the present embodiment, the sewage flowing into the basin 1 when passing through the dust remover 2 shown in FIG. (75 mm). The sewage that has passed through the dust remover 2 reaches the upstream end of the trough 3 over the sand collecting pit 4 and further flows in the direction in which the trough 3 extends. While the sewage flows through the upstream portion of the trough 3, most of the sand contained in the sewage settles in the lower part 1 a of the sand basin 1. Some of the sand settles in the sand collecting pit 4 and some of the sand settles on the inclined surface 6. The sand that has settled on the inclined surface 6 further flows down along the inclined surface 6 toward the trough 3. In addition, the sand that has settled to the upper end portion 82 of the transfer space forming member 8 flows down along the arc-shaped side surface 80 of the transfer space forming member 8 toward the bottom 31 a of the defining surface 31. Thus, sand accumulates in the accumulation space S1 of the trough 3. In the sand basin 1 of the present embodiment, for example, water is discharged for a predetermined time (for example, 3 minutes) in the order of description of the downstream discharge port, the intermediate discharge port, the downstream discharge port, the upstream discharge port, the intermediate discharge port, and the downstream discharge port. As a result, the sand accumulated in the accumulation space S1 is moved to the sand collecting pit 4 through the transfer space S2. The sand that has been moved to the sand collecting pit 4 is discharged out of the sand basin 1 by the sand pump 41.

  Next, a modification of the sand basin 1 shown in FIGS. 1 to 3 will be described. In the modified example described below, differences from the embodiment shown in FIGS. 1 to 3 will be mainly described, and components having the same names as the components in the embodiment shown in FIGS. 1 to 3 will be described. The description will be given with the reference numerals used so far, and duplicate description may be omitted.

  FIG. 4A is a cross-sectional view illustrating a mode corresponding to FIG. 3A in a first variation of the sand basin. In FIG. 4A as well, the horizontal direction of the figure is the width direction of the trough. This modification is different from the embodiment shown in FIGS. 1 to 3 mainly in that the transfer space forming member is constituted by a part of the trough.

  As shown in FIG. 4A, the trough 3 'has a first arc-shaped member 30a and a second arc-shaped member 30b, each of which has a 5/8 arc cross-sectional shape. The first arc-shaped member 30a and the second arc-shaped member 30b are formed by cutting a part of a pipe material such as stainless steel. The first arc-shaped member 30a is a portion (3/8) of a pipe material having a thickness of about 3 mm to 4 mm and a diameter of about 250 mm, which is indicated by a short hand of a watch, from 9:00 to 1:00 and 2:00. Arc). The second arc-shaped member 30b has a thickness of about 3 mm to 4 mm and a diameter of about 150 mm, which is indicated by a short hand of a timepiece from 4 o'clock and 5 o'clock to 9 o'clock (3/3). 8 arc). The trough 3 'is formed by abutting an end of the second arc-shaped member 30b corresponding to the above-mentioned 9:00 to an end of the first arc-shaped member 30a which corresponds to the above-mentioned 9:00. A transfer space forming member is formed by a portion (1/8 arc) from 9 o'clock to between 7 o'clock and 8 o'clock (1/8 arc) pointed by the hour hand of the clock in the first arc member 30a, and the second arc member 30b. 8 'is constituted. That is, the transfer space forming member 8 'has a portion (a 6/8 arc) indicated by the hour hand of the timepiece from 7 o'clock and 8 o'clock to 4 o'clock and 5 o'clock. The transfer space forming member 8 'defines a transfer space S2 in which a portion above the lower end is closed. The first arc-shaped member 30a does not constitute the transfer space forming member 8 ', and is a portion (from 4/7) indicated by the hour hand of the timepiece from 7 o'clock and 8 o'clock to 1 o'clock and 2 o'clock. On the inner periphery of (8 arcs), there is provided a defining surface 31 for defining the deposition space S1. The bottom, which is the deepest part of the defining surface 31, has a bottom 31a. Hereinafter, the left half in the width direction of the defining surface 31 shown in FIG. 4A is referred to as one end of the defining surface 31, and the right half of the defining surface 31 in the width direction is referred to as the other end of the defining surface 31. . That is, the transfer space forming member 8 ′ is connected to one end of the defining surface 31 in the width direction, while being separated from the other end of the defining surface 31 in the width direction. Thereby, the member supporting the transfer space forming member 8 'can be omitted, and the member supporting the transfer space forming member 8' prevents the sand from settling into the deposition space S1 over the entire length of the trough 3 '. No more. In addition, the opening between the other end of the defining surface 31 and the transfer space forming member 8 'is open upward, and the portion opened upward is the opening 3a of the trough 3'.

  The transfer space forming member 8 'is opened downward, and the portion opened downward serves as the suction port 81 of the transfer space forming member 8'. That is, the suction port 81 is open in the deposition space S <b> 1 and opens toward the bottom 31 a of the defining surface 31. The length L of the suction port 81 and the vertical distance C1 between the suction port 81 and the bottom 31a are both in the range of the eye width (here, 75 mm) of the filtration screen 23 shown in FIGS. It is set in. In the present embodiment, the length L is set to about 100 mm, and the interval C1 is set to about 80 mm.

  Further, as described above, the trough 3 ′ of the present embodiment is formed by joining the first arc-shaped member 30 a having a diameter of about 250 mm and the second arc-shaped member 30 b having a diameter of about 150 mm. Therefore, the gap C2 between the other end of the defining surface 31 and the transfer space forming member 28 is about 100 mm. That is, the gap C2 is equal to or larger than the mesh width (here, 75 mm) of the filtration screen 23 illustrated in FIGS. 1 and 2 and equal to or smaller than 125 mm. In this modified example, since a part of the trough 3 ′ constitutes the transfer space forming member 8 ′, it is easy to secure the gap C 2 between the other end side of the defining surface 31 and the transfer space forming member 28, and as a result, The size of the trough 3 'in the width direction can be suppressed. In the modification shown in FIG. 4A, the gap C2 between the other end of the defining surface 31 and the transfer space forming member 28 is in the width direction between the other end of the defining surface 31 and the transfer space forming member 28. The interval is.

  FIG. 4B is a sectional view taken along the line DD in FIG. In FIG. 4B, the left-right direction in the figure is the extending direction of the trough 3 ', the right side in the figure is the upstream side (sand collection pit 4 side), and the left side is the downstream side.

  As shown in FIGS. 4A and 4B, a water supply pipe 71 'extending downward to the transfer space forming member 8' has a lower end portion penetrating the upper end portion 82 of the transfer space forming member 8 '. And the transfer space S2. In a region where the water supply pipe 71 'communicates with the transfer space S2, a discharge port 7' for discharging a fluid into the transfer space S2 is provided. The discharge port 7 ′ is formed by partitioning the upper part of the transfer space S 2 in the transfer space forming member 8 ′ with the partition member 72. The partition member 72 has a horizontal portion 721 that extends horizontally in the direction in which the trough 3 ′ extends, and an inclined portion 722 that is inclined upward from the downstream end of the horizontal portion 721. . The horizontal portion 721 is connected to both sides of the inner peripheral surface of the transfer space forming member 8 ′ in the width direction across the upper end, and the upstream end (sand collecting pit 4 side) has a lower end portion of the water supply pipe 71. It is located on the upstream side. Further, the inclined portion 722 has its downstream end connected to the inner peripheral surface of the transfer space forming member 8 ′ downstream of the portion to which the lower end portion of the water supply pipe 71 is connected, and The downstream side is closed. As a result, a region in the transfer space S2 of the transfer space forming member 8 'where the water supply pipe 71' communicates is partitioned by the partition member 72. Note that, also in this modified example, the discharge port 7 shown in FIG. 3 may be used instead of the discharge port 7 'shown in FIGS. 4A and 4B.

  From the discharge port 7 ', the water supplied from the water supply pipe 71' is discharged in a horizontal direction or a substantially horizontal direction toward the upstream side (see a rightward arrow in FIG. 4B). That is, in FIG. 4B, the right side of the figure is the downstream side in the discharge direction, and the left side of the figure is the upstream side in the discharge direction. As water is discharged from the discharge port 7 'into the transfer space S2 of the transfer space forming member 8', the sand deposited in the deposition space S1 is drawn into the suction port as shown by the curved arrow in FIG. From 81, it is sucked into the transfer space S2. Further, in the transfer space S2, the sucked sand moves toward the downstream in the discharge direction (toward the sand collection pit 4) due to the flow of the water discharged from the discharge port 7 '.

  Next, a second variation of the sand basin will be described.

  FIG. 5 is a cross-sectional view illustrating a state in which a sand basin according to a second modification is cut in the width direction. In FIG. 5, the horizontal direction of the figure is the width direction of the sand basin. The second modification is different from the embodiment shown in FIGS. 1 to 3 mainly in that a trough is not provided in a lower part of a pond.

  As shown in FIG. 5, a flat bottom surface 12 is provided in a lower part 1 a of the sand basin 1. In addition, each of the lower end portions of the pair of opposed side walls 11 of the sand basin 1 is provided with an inclined surface 11a that is inclined so as to expand in the width direction as it goes upward. The lower end of each of these inclined surfaces 11a is connected to the bottom surface 12. A deposition space forming member 13 is disposed at a central portion of the bottom surface 12 in the width direction. The deposition space forming member 13 has an angle shape having a pair of inclined pieces connected at substantially right angles. The tip of the deposition space forming member 13 is fixed to the bottom surface 12 with the corners facing upward. The deposition space forming member 13 extends in the entire lengthwise direction of the pond lower part 1a. In the second modification, two inclined spaces S1 extending in the entire longitudinal direction of the pond lower part 1a are defined by the inclined surface 11a of the side wall 11, the accumulation space forming member 13 and the bottom surface 12. That is, a portion between the inclined surface 11a and the deposition space forming member 13 in the inclined surface 11a, the deposition space forming member 13, and the bottom surface 12 corresponds to a defining surface according to the present invention. Further, the inclined surface 11a and the deposition space forming member 13 correspond to an inclined portion according to the present invention, and a portion of the bottom surface 12 between the inclined surface 11a and the deposition space forming member 13 corresponds to a bottom portion according to the present invention. Equivalent to. Hereinafter, a portion of the bottom surface 12 between the inclined surface 11a and the deposition space forming member 13 is referred to as a bottom portion 12a.

  The sand in the sewage flowing into the sedimentation basin 1 sinks toward the lower part 1a of the pond, enters the deposition space S1, flows down the inclined surface 11a of the side wall 11 and the deposition space forming member 13, and falls into the deposition space S1. accumulate. Here, the inclination angle of the inclined surface 11 a of the side wall 11 and the inclination angle of the deposition space forming member 13 are not particularly limited, but are set to 45 degrees in this modification. The deposition space forming member 13 is made of metal such as stainless steel, but may be made of concrete integrally with the bottom surface 12. Further, the inclined surface 11a of the side wall 11 and the deposition space forming member 13 may have an arc-shaped cross section.

  In each of the deposition spaces S1, a transfer space forming member 8 having the same shape and size as the transfer space forming member 8 shown in FIG. The support table 91 is similar to the support table 91 shown in FIG. 3, and a plurality of the support tables 91 are provided at intervals of about 5 m in the longitudinal direction of the pond lower part 1a. The water supply pipe 71 ″ extends upward from below the support base 91, penetrates the horizontal surface 9131, bends to the upstream side at the same time, and is formed with the discharge port 7 facing the upstream side so as to be placed on the horizontal surface 9131. I have. The discharge port 7 is also of a flat long hole shape.

  The length L of the suction port 81 of the transfer space forming member 8 is set within a range of not less than the eye width (here, 75 mm) and not more than 125 mm of the screen member (here, the filtration screen 23). The length L is about 100 mm. In addition, the suction port 81 of the transfer space forming member 8 opens in the deposition space S1 and opens toward the bottom 12a. The vertical interval C1 between the suction port 81 and the bottom 31a is also set within the range of the eye width (here, 75 mm) or more and 125 mm or less of the screen member (here, the filtration screen 23). C1 is about 100 mm.

  The bottom portion 12a has a length in the width direction longer than the length in the width direction of the suction port 81. In both the portion where the inclined surface 11a connects to the bottom portion 12a and the portion where the deposition space forming member 13 connects to the bottom portion 12a, the distance D in the width direction from the suction port 81 is set to 125 mm or less. Is about 80 mm. Thus, it is possible to prevent the sand accumulated in the accumulation space S1 from becoming difficult to be sucked into the transfer space S2 due to a long distance from the suction port 81.

  In addition, a gap C22 between the transfer space forming member 8 and the inclined surface 11a in a direction orthogonal to the inclined surface 11a, and a gap C22 between the transfer space forming member 8 and the deposition space forming member 13 in a direction orthogonal to the deposition space forming member 13. Even at the narrowest portion, the gap C21 is set to be equal to or larger than the mesh width (here, 75 mm) of the screen member (here, the filtration screen 23), and in this modification, the gaps C21 and C22 are about 100 mm.

  According to the sand basin 1 of the present embodiment described above, it is possible to suppress the winding of the sand while moving the sand sufficiently.

  Next, a sedimentation basin that is a second embodiment of the transfer system of the present invention will be described. In the following description, components having the same names as those of the components described so far will be denoted by the same reference numerals, and duplicate description may be omitted. The sedimentation basin is located downstream of the sedimentation basin in the sewage treatment system, receives sewage from which sand has been removed by the basin, sediments the sludge contained in the received sewage, and then setstle the settled sludge into a sludge pit. To remove it from sewage.

  FIG. 6 is a plan view of a settling basin, which is a second embodiment of the transfer system of the present invention, as viewed from above. 7 is a sectional view taken along the line EE of the sedimentation basin shown in FIG. 6, and FIG. 8 is a sectional view taken along the line FF of the sedimentation basin shown in FIG.

  As shown in FIG. 6, the sedimentation basin 10 is a pond having a sludge pit 14 and having a rectangular shape in plan view. Hereinafter, the long side direction of the sedimentation basin 10 may be referred to as a longitudinal direction, and the short side direction may be referred to as a width direction. In FIG. 6, the horizontal direction of the figure is the longitudinal direction of the sedimentation basin 10, and the vertical direction of the figure is the width direction of the sedimentation basin 10. In FIG. 7, the horizontal direction of the drawing is the longitudinal direction of the sedimentation basin 10, and in FIG. 8, the horizontal direction of the drawing is the width direction of the sedimentation basin 10.

  In the sedimentation basin 10 shown in FIGS. 6 and 7, the received water slowly flows toward the left side of the figure at a flow rate of, for example, about 0.03 m / min to 0.5 m / min (FIGS. 6 and 7). ). That is, the longitudinal direction of the sedimentation basin is the direction of water flow, and the right side in FIGS. 6 and 7 is the upstream side and the left side is the downstream side. The sedimentation basin 10 extends in the width direction and is located on the upstream side, and an upstream wall 10h, a pair of longitudinally extending side walls 10c (see FIG. 6), and extends in the width direction and is located on the downstream side. It has a downstream wall 10g, a length in the longitudinal direction is about 35 m, and a length in the width direction is about 25 m. As shown in FIG. 7, an overflow weir 100g is provided on the downstream wall 10g. The sewage that has passed over the weir 100 g is sent to, for example, a reaction tank of a sewage treatment system. In addition, as shown in FIG. 6, an opening 100h communicating with a headrace (not shown) is provided in the upstream wall 10h.

  As shown in FIG. 6 and FIG. 8, a sludge pit 14 is provided at the center in the width direction on the upstream side of the sedimentation basin 10. A sludge pump (not shown) is provided outside the sludge pit 14, and a suction port (not shown) of the sludge pump is provided in the sludge pit 14. The sludge collected in the sludge pit 14 is sucked from the suction port by driving the sludge pump, and is conveyed to the outside of the sedimentation basin 10. That is, the sludge pump corresponds to an example of the discharging means of the present invention for discharging the contaminants out of the received water. The sludge pump of the present embodiment has a discharge amount (discharge amount) of 2.0 m3 / min. As shown in FIGS. 6 and 8, a pair of accumulation grooves 141 extending in the width direction and connected to the sludge pit 14 are provided on both sides of the sludge pit 14 in the width direction. Each of these accumulation grooves 141 is a groove having a width of about 4 m in the longitudinal direction of the sedimentation basin 10 and a total length of about 10 m in the width direction of the sedimentation basin 10. . As shown in FIGS. 7 and 8, groove bottoms 104 are provided at the bottoms of the integrated grooves 141, respectively. In addition, as shown in FIG. 8, the groove bottom surface 104 of each of the accumulation grooves 141 is inclined so that the water depth of the sedimentation basin 10 increases toward the sludge pit 14.

  As shown in FIG. 6, the upstream side of the sludge pit 14 and the accumulation groove 141 in the sedimentation basin 10 is partitioned into four regions by three partition walls 10 d extending in the longitudinal direction. A pond lower part 10a is provided. As shown in FIGS. 7 and 8, a ceiling 10 e is provided at an upstream portion of the pond lower portion 10 a and above the sludge pit 14 and the accumulation groove 141. In FIG. 6, the ceiling 10e is omitted to show the accumulation groove 141.

  A deposition space forming member 13 having the same cross-sectional shape as the deposition space forming member 13 shown in FIG. 5 extends over substantially the entire length of the bottom surface 102 of the pond lower portion 10a on the bottom surface 102 of each of the pond lower portions 10a shown in FIG. It is arranged in a state where it was present. As shown in FIG. 8, the lower end portion of the side wall 10c of the present embodiment is not provided with the inclined surface 11a shown in FIG. 5, and the lower end portion of the partition wall 10d is not provided with the inclined surface. . In the present embodiment, a second deposition space forming member 131 composed of one inclined piece is disposed at both ends in the width direction of the bottom surface 102 of the pond lower part 10a. In the present embodiment, as shown in FIG. 8, four deposition spaces S3 are formed in the lower part of each pond 10a by the deposition space forming member 13 and the second deposition space forming member 131 so as to be arranged in the width direction. ing. Note that an inclined surface may be provided at a lower end portion of the side wall 10c or the partition wall 10d, and the second deposition space forming member 131 may be omitted.

  The sludge in the sewage that has flowed into the area of the sedimentation basin 10 partitioned by the partition wall 10d settles toward the lower part 10a of each pond and enters the accumulation space S3, and the accumulation space forming member 13 and the second accumulation space. It flows down along the forming member 131. As a result, the settled sludge is deposited on the bottom surface 102 at a portion between the deposition space forming member 13 and the deposition space forming member 13 or at a portion between the deposition space forming member 13 and the second deposition space forming member 131. I do. These portions correspond to the bottom portion according to the present invention, and these portions are hereinafter referred to as a first bottom portion 102a. That is, the first bottom portion 102a, the deposition space forming member 13, and the second deposition space forming member 131 correspond to the defining surface according to the present invention.

  A transfer space forming member 28 having the same cross-sectional shape and cross-sectional size as the transfer space forming member 8 shown in FIG. . Further, a support member 29 for supporting the transfer space forming member 28 and a mounting frame 26 on which the support member 29 is suspended are provided.

  As shown in FIG. 8, the transfer space forming members 28 are arranged at the center in the width direction in the respective deposition spaces S3 and on the first bottom 102a. 6 and 7, the transfer space forming member 28 extends along the longitudinal direction of the sedimentation basin 10, and the entire length of the transfer space forming member 28 is in the longitudinal direction of the pond lower part 10a. Same as length. The transfer space forming member 28 is supported by the support member 29 and the mounting frame 26 in a state separated from the first bottom portion 102a. The mounting frame 26 has a U-shaped cross section, and extends in the width direction of the sedimentation basin 10 in each region of the sedimentation basin 10 partitioned by the partition wall 10d, as shown in FIGS. It was done. As shown in FIG. 6, a plurality of attachment frames 26 are arranged at intervals in the longitudinal direction of the sedimentation basin 10. Both ends of the mounting frame 26 are supported by the receiving frames 261. These receiving frames 261 are fixed to portions of the side wall 10c and the partition wall 10d that are above the water surface. A support member 29 is suspended from the mounting frames 26 supported by the receiving frames 261 respectively. As shown in FIG. 8, a plurality of support members 29 are provided in a region extending in the vertical direction at respective positions corresponding to the transfer space forming member 28 in each region partitioned by the partition wall 10d. As shown in FIG. 7, a plurality of support members 29 are provided at predetermined positions in the longitudinal direction at positions corresponding to the positions of the mounting frames 26 in the longitudinal direction.

  As shown in FIG. 7, a water supply pipe 271 connected to the upper end portion of the transfer space forming member 28 is provided at a lower part of each pond 10 a at an interval of about 6 m in the longitudinal direction. These water supply pipes 271, like the water supply pipe 71 shown in FIG. 3, penetrate the transfer space forming member 28 and enter the transfer space forming member 28, and then bend to the upstream side (the sludge pit 14 and the accumulation groove 141 side). A discharge port 27 having the same shape as the discharge port 7 shown in FIG. 3 is formed (see FIG. 8). Thus, in the second embodiment, in each transfer space forming member 28, five discharge ports are provided at intervals of about 6 m in the longitudinal direction. From these discharge ports, the water supplied from the water supply pipe 271 is discharged in a horizontal direction or a substantially horizontal direction toward the upstream side (the right side in FIGS. 6 and 7). That is, in the pond lower part 10a shown in FIG. 6 and FIG. 7, the right side of the figure is the downstream side in the discharge direction, and the left side of the figure is the upstream side in the discharge direction. 6 and 8, the water supply pipe 271 is omitted to simplify the drawings.

  FIG. 9A is an enlarged view showing a G portion of FIG. 8 in an enlarged manner, and FIG. 9B is an enlarged view showing an H portion of FIG. 8 in an enlarged manner. 9A and 9B, the horizontal direction of the figure is the width direction of the sedimentation basin 10. 7 has the same structure as the G part of FIG. 8, and therefore, in FIG. 9A, the reference sign of the I part of FIG. May be. 7 has the same structure as the H section in FIG. 8, and therefore the description of the J section in FIG.

  First, the pond lower part 10a will be described. As shown in FIGS. 9A and 9B, the support member 29 includes a pipe member 291 extending in a vertical direction, a lower screw member 292 attached to a lower end of the pipe member 291, and a pipe member 291. 291, and an upper screw member 293 attached to the upper end of the upper screw member 293. As shown in FIG. 9 (a), a cylindrical portion 283 whose inner periphery is threaded is provided at an upper end portion of the transfer space forming member 28. The support member 29 has a lower screw member 292 attached to the cylindrical portion 283 of the transfer space forming member 28. As shown in FIG. 9B, the support member 29 is attached to the mounting frame 26 by being tightened with nuts N from above and below the mounting frame 26 in a state of being inserted through holes formed in the mounting frame 26. It is suspended on a frame 26. These support the transfer space forming member 28 forming the transfer space S4, and the suction port 281 of the transfer space forming member 28 opens toward the first bottom 102a in the deposition space S3. The support member 29 can be removed from the attachment frame 26 and the removed support member 29 can be pulled up even in a state in which sewage is accumulated in the sedimentation basin 10. Thereby, the transfer space forming member 28 and the discharge port 27 can be pulled up, and maintenance of the transfer space forming member 28 and the discharge port 27 can be performed.

  Here, large contaminants are removed in the sand basin provided on the upstream side of the sedimentation basin 10, and the wastewater received by the sedimentation basin 10 contains almost no large contaminants. For this reason, the sedimentation basin 10 is often not provided with a screen member such as the filtration screen 23 shown in FIGS. The sedimentation basin that receives sewage containing no sand may be provided with a screen member instead of not having a sand basin on the upstream side. That is, in the sedimentation basin 10, it is less necessary to consider that the contaminant is clogged in the suction port 281 and the like as compared with the sand basin. For this reason, the length L of the suction port 281 and the distance C1 between the suction port 281 and the first bottom portion 102a are within a range that does not make it difficult to suck the sludge into the transfer space forming member 28 when water is discharged from the discharge port 27. Can be set. Specifically, the length L of the suction port 281 and the vertical distance C1 between the suction port 281 and the first bottom portion 102a can be appropriately set within a range of 125 mm or less. As described above, the transfer space forming member 28 shown in FIG. 9A has the same cross-sectional shape and cross-sectional size as the transfer space forming member 8 shown in FIG. It is about 100 mm. In the transfer space forming member 28 shown in FIG. 9A, the vertical space C1 between the suction port 281 of the transfer space forming member 28 and the first bottom portion 102a is set to about 50 mm. The position of the support member 29 in the vertical direction can be adjusted by adjusting the position of the nut N in the upper screw member 293. Thus, the vertical position of the transfer space forming member 28 supported by the support member 29 can be adjusted, and the vertical distance C1 between the suction port 281 and the first bottom portion 102a can be changed.

  Further, a distance D in the width direction between a portion where the second deposition space forming member 131 connects to the first bottom portion 102a and the suction port 281 and a portion where the deposition space forming member 13 connects to the first bottom portion 102a and the suction port 281 Any width D in the width direction can be appropriately set within a range of 125 mm or less which does not make it difficult to suck the sludge into the transfer space forming member 28 when the water is discharged from the discharge port 27. In the transfer space forming member 28 shown in FIG. 9A, the distance D is set to about 50 mm. Further, a gap C21 between the transfer space forming member 28 and the deposition space forming member 13 in a direction perpendicular to the stacking space forming member 13, and a transfer space forming member 28 and a A gap C23 between the second deposition space forming member 131 and the narrowest portion is about 80 mm. Note that the winding prevention plate 95 shown in FIG. 3 is not provided in the portion 2711 of the water supply pipe 271 shown in FIG. 9A that has entered the transfer space S4. The reason for this is that string-like contaminants are removed in the sand basin, and the wastewater received by the sedimentation basin 10 contains almost no string-like contaminants. This is because the nature is low. Here, when a sand basin is not provided on the upstream side of the sedimentation basin 10, a winding prevention plate similar to the winding prevention plate 95 shown in FIG. 3 is inserted into the transfer space S4 of the water supply pipe 271. It is preferable to provide it on the flange 2711.

  When a screen member is provided in the sedimentation basin 10, the length L of the suction port 281, the distance C1 between the suction port 281 and the first bottom 102 a, the transfer in a direction orthogonal to the deposition space forming member 13. The gap C21 between the space forming member 28 and the stacking space forming member 13 and the gap C23 between the transfer space forming member 28 and the second stacking space forming member 131 in a direction orthogonal to the second stacking space forming member 131 are respectively screened. It is preferable that the width be equal to or less than the mesh width of the member.

  Next, the accumulation groove 141 will be described. As shown in FIG. 7, a plurality of deposition space forming members 13 ′ and a plurality of second deposition space forming members 131 ′ are arranged on the groove bottom surface 104 of each of the pair of accumulation grooves 141. As shown in FIG. 6, the deposition space forming member 13 ′ and the second deposition space forming member 131 ′ extend in the width direction of the sedimentation basin 10 and are arranged at intervals in the longitudinal direction of the sedimentation basin 10. Have been. As a result, a deposition space S5 extending over substantially the entire length of the accumulation groove 141 is formed (see FIG. 7). In the present embodiment, three accumulation spaces S5 are formed in each of the pair of accumulation grooves 141 sandwiching the sludge pit 14. As shown in FIG. 9A, a transfer space forming member 28 'is supported by a support member 29' in each of these deposition spaces S5, similarly to the deposition space S3 of the pond lower part 10a shown in FIGS. The suction port 281 of the transfer space forming member 28 'is open toward the second bottom portion 104a in the deposition space S5. The transfer space forming member 28 'forms the transfer space S6. The length L of the suction port 281 of the transfer space forming member 28 ', the vertical distance C1 between the suction port 281 of the transfer space forming member 28' and the second bottom portion 104a, the transfer space forming member 28 'and the deposition space forming member 13. C21, the gap C23 between the transfer space forming member 28 'and the second stacking space forming member 131', the width of the portion where the second stacking space forming member 131 'is connected to the second bottom 104a, and the width of the suction port 281. Both the distance D in the direction and the distance D in the width direction between the portion where the deposition space forming member 13 ′ connects to the second bottom 104 a and the suction port 281 are the same as those in the lower part of the pond 10 a. As shown in FIG. 6, the mounting frame 26 ′ in which the support member 29 ′ is suspended in the accumulation groove 141 extends above the accumulation groove 141 in the longitudinal direction of the sedimentation basin 10. They are arranged at predetermined intervals in the width direction. In the present embodiment, three mounting frames 26 'are arranged in each of the accumulation grooves 141. As shown in FIGS. 6 and 8, among the three mounting frames 26 ′, the mounting frame 26 ′ arranged at the center in the width direction of the sedimentation basin 10 has an upstream end portion fixed to the upstream wall 10 h. The downstream end portion is supported by the receiving frame 261 'fixed to the upstream surface of the partition wall 10d. As shown in FIGS. 6 and 7, among the three mounting frames 26 ′, the two mounting frames 26 ′ arranged on the outer side in the width direction of the sedimentation basin 10 have their upstream end portions settled. It is supported by a receiving frame 261 'fixed to the upstream wall 10h of the pond 10, and a downstream end portion is supported on a mounting frame 26' located at the most upstream side in the pond lower part 10a. A support member 29 'is suspended from each of these mounting frames 26'.

  As shown in FIG. 8, in each of the transfer space forming members 28 ′ provided in the accumulation groove 141, a water supply pipe 271 ′ has an outer end portion in the width direction of the sedimentation basin 10 and a width direction of the sedimentation basin 10. Are connected to the middle part of These water supply pipes 271 ′, like the water supply pipe 71 shown in FIG. 3, penetrate the transfer space forming member 28 ′ and enter the transfer space forming member 28 ′, and then, toward the center in the width direction (the sludge pit 14 side). It is bent to form the same discharge port 27 'as the discharge port 7 shown in FIG. 3 (see FIG. 9A). Thus, in the present embodiment, two discharge ports 27 'are provided at intervals of about 5 m in the longitudinal direction in each transfer space forming member 28'. From these discharge ports 27 ', the water supplied from the water supply pipe 271' is discharged in the horizontal direction or substantially horizontal direction toward the sludge pit 14 side. That is, in each of the pair of accumulation grooves 141, the outer side in the width direction of the sedimentation basin 10 is on the upstream side in the discharge direction, and the inner side in the width direction of the sedimentation basin 10 (the sludge pit 14 side) is on the downstream side in the discharge direction. 6 and 7, the water supply pipe 271 'is omitted to simplify the drawings.

  The sewage flowing into the sedimentation basin 10 reaches the upstream end of each lower part 10a of the pond over the sludge pit 14 and the accumulation groove 141, and flows further along the extending direction of each lower part of the pond 10a. While the sewage flows, the sludge contained in the sewage settles in the sludge pit 14, the accumulation groove 141, and the lower part 10a of the pond. The sludge settled in the accumulation groove 141 flows down to the second bottom 104a in the accumulation space S5 via the accumulation space forming member 13 'and the second accumulation space forming member 131'. Also, the water flows down the second bottom portion 104a along the outer peripheral surface of the transfer space forming member 28 '. Thus, sludge is deposited in the deposition space S5. Further, the sludge settled in the lower part of the pond 10a flows down to the first bottom 102a in the deposition space S3 through the deposition space forming member 13 and the second deposition space forming member 131. Further, the water flows down the outer peripheral surface of the transfer space forming member 28 and flows down to the first bottom portion 102a in the deposition space S3. Thus, sludge is deposited in the deposition space S3.

  At each pond lower part 10a, the water discharged from the discharge port 27 into the transfer space S4 of the transfer space forming member 28 causes the sludge deposited in the deposition space S3 to be discharged as shown by the curved arrow in FIG. Is sucked into the transfer space S4 from the suction port 281. Further, in the transfer space S4 of the transfer space forming member 28, the sucked sludge moves toward the downstream side in the discharge direction (toward the sludge pit 14 or the accumulation groove 141) due to the flow of water discharged from the discharge port 27. I do. In each of the pond lower portions 10a, for example, among the plurality of discharge ports 27 provided at intervals in the longitudinal direction, from the most upstream side in the discharge direction (the most downstream side in the flow of water in the sedimentation basin 10) to the downstream side in the discharge direction. Water is discharged sequentially (upstream in the flow of water in the sedimentation basin 10) for about three minutes, and the sludge accumulated in the accumulation space S3 can be moved to the sludge pit 14 and the accumulation groove 141. Similarly, the sludge accumulated in the accumulation space S5 in the accumulation groove 141 is discharged from the discharge port 27 'of the accumulation groove 141 into the transfer space S6 of the transfer space forming member 28', so that the accumulation space is formed. The sludge accumulated in S5 is sucked into the transfer space S6 from the suction port 281 as indicated by the curved arrow shown in FIG. Further, in the transfer space S6 of the transfer space forming member 28 ', the sucked sludge moves toward the downstream side in the discharge direction (toward the sludge pit 14) due to the flow of the water discharged from the discharge port 27'. In the accumulation groove 141, for example, after discharging water for about 3 minutes from the discharge port 27 ′ on the upstream side in the discharge direction (outside in the width direction of the sedimentation basin 10), the discharge port 27 on the downstream side in the discharge direction (the sludge pit 14 side) is used. By discharging the water from the ′ for about 3 minutes, the sludge accumulated in the accumulation space S5 can be moved to the sludge pit.

  The discharge amount of water discharged from the discharge ports 27 and 27 'of the present embodiment is preferably not more than the discharge amount of the sludge pump (here, 2.0 m3 / min), and more than 0 and not more than 3.0 m3 / min. May be set in the range. In addition, since the sludge is a mud having a smaller particle size than sand and is easier to move than sand, it is necessary to sufficiently move the sludge with a smaller discharge amount than the discharge amount of water at the discharge port 7 shown in FIG. Can be. For this reason, the discharge amount of the water discharged from the discharge port 7 shown in FIG. 3 can be reduced to about １ ／. For example, the discharge amount of the water discharged from the discharge ports 27 and 27 ′ of the present embodiment can be reduced. , About 0.5 m3 / min. Further, the discharge flow rate at the discharge ports 27 and 27 'of the present embodiment can be set to, for example, about 1/3 of the discharge flow rate of water at the discharge port 7 shown in FIG.

  According to the sedimentation pond 10 of the second embodiment described above, the sludge can be prevented from rolling up while moving the sludge sufficiently.

  Note that the gaps C2, C21, C22, and C23 described above have a length perpendicular to the ejection direction and excluding the vertical direction.

  The present invention is not limited to the embodiments described above, and various changes can be made within the scope described in the claims. For example, a transfer system may be provided in a factory or the like, and metal powder or the like generated in the factory or the like may be moved in one direction and collected at a predetermined location. The sedimentation basin 10 of the second embodiment includes a plurality of lower ponds 10a partitioned by partition walls 10d and an accumulation groove 141 connected to the sludge pit 14. It may be a sedimentation basin that includes the pits 14 and does not include the accumulation groove 141.

  In addition, even if it is a component contained only in the description of each of the above-described embodiments and modifications, the component may be applied to other embodiments and modifications.

Reference Signs List 1 sedimentation basin 10 sedimentation basin 1a, 10a lower part of pond 13 sedimentary space forming member 23 filtration screen 3 trough 31 demarcation surface 31a bottom 4 sand collecting pit 41 sand pump 6 inclined surface 7, 27 discharge port 8, 28 transfer space forming member 81 , 281 Suction port 14 Sludge pit 141 Stacking groove 29 Support member S1, S3, S5 Deposition space S2, S4, S6 Transfer space

Claims (2)

A transfer system is provided, in which a sedimentary space in which the contaminant contained in the received water settles is provided, and the contaminant accumulated in the sedimentary space is transferred.
A space forming member that forms a space in which an upper end portion is closed, and an opening that is provided below the upper end portion and that is separated from a defining surface that defines the deposition space;
A discharge port for discharging a fluid into the space,
The space forming member, wherein the upper end portion has an arc shape,
The transfer system, wherein the discharge port discharges a fluid toward a downstream side in a transfer direction of the contaminant. The transfer system according to claim 1, wherein the discharge port discharges a fluid that is larger than 0 and 3.0 m ³ / min or less.