JP2017189773A - Transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress stirring-up of a contaminant while sufficiently moving the contaminant, in a transfer system for transferring a contaminant accumulated in a deposition space where the received contaminant in water settles down.SOLUTION: A transfer system comprises: a transfer space formation member 8 forming a transfer space S2 with a closed upper end portion 82 and provided with a suction port 81 below the upper end portion 82, which is separated from a defining surface defining a deposition space S1; and a discharge port 7 for discharging a fluid into the transfer space S2. The suction port 82 opens inside the deposition space S1 and functions as an opening which sucks a contaminant deposited in the deposition space S1 into the transfer space S2 by discharging the fluid from the discharge port 7. The transfer space formation member 8 functions as a path through which the contaminant sucked into the transfer space S2 moves toward a discharge direction downstream side of the fluid by discharging the fluid from the discharge port 7. The upper end portion 82 of the transfer space formation member 8 has an arc shape.SELECTED DRAWING: Figure 3

Description

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

  In the sewage treatment system, which is a form of wastewater treatment system, each sedimentation basin and sedimentation basin is provided with a sedimentation space in which contaminants contained in the received water settle, and the contaminants deposited in this sedimentation space are transferred. One of the transfer systems Here, in the sand basin, in order to collect sewage such as sewage or rain water, set the sand contained in the sewage in a trough provided at the bottom of the pond, and then collect the sand accumulated in the trough etc. Some move in a certain direction to remove the collected sand from the sewage. In addition, the sedimentation basin receives the sewage from which sand has been removed in the sedimentation basin, sinks the sludge contained in the received sewage into the lower part of the pond, and then collects the sludge accumulated in the lower part of the pond in a predetermined direction. Some move and remove collected sludge from sewage. In these sedimentation basins and sedimentation basins, the troughs provided in the lower part of the pond and the sand and sludge accumulated in the deposition space are moved toward the downstream side of the fluid discharge direction by the flow of fluid discharged from the discharge port, and gathered together. It is known that waste 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 how to suppress the sand and sludge from rolling up. Therefore, a shielding plate inclined downward toward the downstream side in the discharge direction is disposed in the accumulation space where the sludge settles, with an interval along the discharge direction, and the shielding plate tries to prevent the sludge from rolling up. A sedimentation basin has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 64-56807

  However, in the sedimentation basin described in Patent Document 1, the shielding plate is disposed so as to face the discharge direction, and the fluid discharged from the discharge port is blocked, and there is a possibility that the sludge does not move sufficiently. is there. For this reason, if the discharge pressure of the discharge port is increased so as to sufficiently move the sludge, the sludge may be rolled up along the shielding plate by the momentum of the discharged fluid. Moreover, even if it is a case where the shielding board described in patent document 1 is arrange | positioned at the trough of a sand basin, there exists a problem similar to patent document 1. FIG. Furthermore, in addition to sand basins and sedimentation basins, for example, metal powder generated when processing metal products in factories and the like can be moved in a predetermined direction, and the collected metal powder can be discharged. It is preferable to move the metal powder while preventing the metal powder from rolling up.

  In view of the above circumstances, an object of the present invention is to provide a transfer system that is devised to suppress the rolling-up of contaminants while sufficiently moving the contaminants.

The transfer system of the present invention that solves the above object is provided with a deposition space in which contaminants contained in the received water are settled, and transfers the contaminants deposited in the deposition space,
A transfer space forming member having a transfer space closed by an upper end portion, and provided with a suction port spaced from a defining surface defining the deposition space below the upper end portion;
A discharge port for discharging fluid in the transfer space;
The suction port opens in the deposition space, and functions as an opening for sucking the contaminants accumulated in the deposition space into the transfer space by discharging fluid from the discharge port,
The transfer space forming member functions as a path through which contaminants sucked into the transfer space move toward the downstream side in the discharge direction of the fluid by discharging the fluid from the discharge port.
The transfer space forming member is characterized in that the upper end portion has an arc shape.

Moreover, in the transfer system of the present invention, the demarcation surface has an inner periphery, and a groove opened upward is provided.
The transfer space forming member may have the upper end portion positioned below the opening of the groove.

  Moreover, the transfer system of this invention WHEREIN: The said transfer space may become narrow so that the lower end part connected to the said suction inlet may approach this suction inlet.

In addition, there is provided a deposition space in which contaminants contained in the received water are settled, and a transfer system for transferring the contaminants deposited in the deposition space,
A transfer space forming member in which a transfer space in which an upper end portion is closed is formed, and a suction port spaced from a defining surface that defines the deposition space is provided below the upper end portion;
A discharge port for discharging fluid into the transfer space;
A discharge means,
The suction port functions as an opening that opens in the deposition space and sucks the contaminants accumulated in the deposition space into the transfer space by discharging fluid from the discharge port.
The transfer space forming member functions as a path for moving the contaminants sucked into the transfer space toward the downstream side in the discharge direction of the fluid by discharging the fluid from the discharge port.
The discharge means may discharge the contaminant transferred to the downstream side in the discharge direction out of the received water.

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

  Further, a pit deeper than the deposition space may be provided. Further, the discharge means may be a pump, or a device that discharges the contaminants transferred to the downstream side in the discharge direction by a bucket or the like out 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 inside the pit or may be provided outside the pit. In the case of the latter, the aspect provided with the suction port which attracts | sucks the contaminant transferred to the said discharge direction downstream in the said pit may be sufficient.

  The transfer space forming member may have a cross-sectional shape of a C shape (arc shape), a U shape, a V shape, a U shape, or the like.

  According to this transfer system, the fluid accumulated in the deposition space is sucked into the transfer space from the suction port by discharging fluid from the discharge port into the transfer space. Here, since the suction opening is opened in the deposition space, the mixture deposited in the deposition space can be efficiently sucked into the transfer space. Further, in the transfer space, the sucked contaminant moves toward the downstream side in the discharge direction by the fluid flow, and the contaminant transferred to the downstream side in the discharge direction is received by the discharge means. Discharged outside the water. Even if the contaminant moving toward the downstream side in the discharge direction in the transfer space leaks out from the suction port on the downstream side in the discharge direction, the suction port is opened in the deposition space. It tends to stay in the deposition space. Therefore, according to this transfer system, it is possible to suppress the rolling-up of the contaminants while sufficiently moving the contaminants.

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

  By doing so, it is possible to prevent the amount of received water from being excessively increased by the fluid discharged from the discharge port.

Moreover, in this transfer system, the discharge means is a pump,
It is preferable that the discharge port discharges a fluid of greater than 0 and 3.0 m3 / min or less.

  By doing so, it is possible to prevent the contaminant moving in the transfer space from inadvertently coming out of the transfer space forming member due to an excessive amount of fluid discharged from the discharge port. It is possible to further suppress the rolling-up of contaminants. Further, it is not necessary to use a pump having a large capacity such that the discharge amount exceeds 3.0 m 3 / min, and the cost of the pump can be suppressed.

The transfer system further includes a screen member that is provided upstream of the deposition space, and that prevents the passage of contaminants larger than the mesh width among the contaminants mixed in the received water.
The suction port is open toward the bottom of the demarcated surface,
When the direction perpendicular to the discharge direction in the horizontal plane is the width direction,
The clearance between the transfer space forming member and the demarcating surface, the vertical distance between the suction port and the bottom, and the length in the width direction of the suction port are each an aspect of not less than the mesh width and not more than 125 mm. May be.

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

  According to this aspect, by setting the gap, the interval, and the length to be greater than or equal to the mesh width, contaminants smaller than the mesh width that have passed through the screen are mixed with the transfer space forming member and the defining surface. It is possible to prevent clogging between the suction port and the bottom or between the suction port and the suction port. Here, the larger the vertical distance between the suction port and the bottom, the more difficult it is for the contaminants to be sucked into the transfer space. Moreover, even if the length of the suction port in the width direction becomes too long, contaminants are not easily sucked into the transfer space. For this reason, it is possible to make it difficult for contaminants to be sucked into the transfer space by setting the distance in the vertical direction between the suction port and the bottom and the length in the width direction of the suction port to 125 mm or less. Can be suppressed.

The transfer system further includes a screen member provided on the upstream side of the deposition space and preventing passage of contaminants larger than the mesh width among contaminants mixed in the received water.
When the direction perpendicular to the discharge direction in the horizontal plane is the width direction,
The transfer space forming member is connected to one end side in the width direction of the defining surface, while being separated from the other end side in the width direction of the defining surface,
The clearance between the transfer space forming member and the other end side, the vertical distance between the suction port and the bottom of the defining surface, and the length of the suction port in the width direction are not less than the mesh width and not more than 125 mm. The aspect of this may be sufficient.

  Here, the said transfer space formation member may be connected to the upper end part of the said one end side, and may be connected to the middle part in the up-down direction of the one end side.

  According to this aspect, by making each of the gap, the interval, and the length equal to or larger than the mesh width, contaminants smaller than the mesh width that have passed through the screen are transferred to the transfer space forming member and the other end. Clogging between the suction port and the bottom or between the suction port and the suction port is suppressed. In addition, by making the vertical distance between the suction port and the bottom and the length in the width direction of the suction port not more than 125 mm, it is possible to prevent the contaminants from being sucked into the transfer space. be able to.

The transfer system further includes a screen member that is provided upstream of the deposition space, and that prevents the passage of contaminants larger than the mesh width among the contaminants mixed in the received water.
The suction port is open toward the bottom of the demarcated surface,
When the direction perpendicular to the discharge direction in the horizontal plane is the width direction,
The demarcating surface has a flat bottom portion and a slant portion connected to the bottom portion and directing contaminants that have settled in the deposition space to the bottom portion,
The bottom portion has a length in the width direction that is longer than a length in the width direction of the suction port,
The distance between the suction port and the bottom in the vertical direction, and the length of the suction port in the width direction are not less than the above-mentioned mesh width and not more than 125 mm,
The gap between the transfer space forming member and the oblique portion is not less than the mesh width,
The distance of the said width direction of the part which the said suction inlet and the said oblique part connect to the said bottom part may be 125 mm or less.

  According to this aspect, by setting the gap, the interval, and the length to be greater than or equal to the mesh width, contaminants that are smaller than the mesh width that have passed through the screen are placed between the suction port and the bottom portion. It is possible to suppress clogging between the suction port or the transfer space forming member and the oblique portion. In addition, by setting the vertical distance between the suction port and the bottom and the length in the width direction of the suction port to 125 mm or less, the contaminants accumulated at the bottom are sucked into the transfer space. It can be suppressed that it becomes difficult to get rid of. Here, among the contaminants that have settled in the accumulation space, the contaminants that have settled in the oblique portion are directed to the bottom portion by the oblique portion. Therefore, by setting the distance in the width direction between the portion where the oblique portion is connected to the bottom and the suction port to be 125 mm or less, the contaminants that have settled in the deposition space are sucked into the transfer space. It can be made easy.

  ADVANTAGE OF THE INVENTION According to this invention, the transfer system by which the device which suppresses rolling-up of a contaminant was made | formed can be provided, moving a contaminant sufficiently.

It is the top view which looked at the sand basin equivalent to one Embodiment of the transfer system of this invention from upper direction. It is AA sectional drawing of the sand basin shown in FIG. (A) is BB sectional drawing in FIG. 2, (b) is CC sectional drawing 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 | disconnected the sand basin of the 2nd modification in the width direction. It is the top view which looked at the sedimentation basin which is 2nd Embodiment of the transfer system of this invention from upper direction. It is EE sectional drawing of the sedimentation basin shown in FIG. It is FF sectional drawing of the sedimentation basin shown in FIG. (A) is an enlarged view showing an enlarged G part of FIG. 8, and (b) is an enlarged view showing an enlarged H part of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. A sand basin that is one embodiment of the transfer system of the present invention is disposed on the upstream side of a sewage treatment system, and after sand contained in sewage such as sewage or rainwater is settled, the sedimented sand is collected in a sand collecting pit. It is moved and removed from sewage.

  FIG. 1 is a plan view of a sand basin corresponding to an embodiment of the transfer system of the present invention as viewed from above, and FIG. 2 is a cross-sectional view taken along line AA of the sand basin shown in FIG.

  As shown in FIG. 1, the sand settling basin 1 is a rectangular pond that includes 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 the long side direction, and the short side direction may be referred to as the 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. Further, water is discharged to the right side of FIGS. 1 and 2 from a discharge port described later. 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 residue and the like from the contaminants mixed in the sewage flowing into the sand 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 that is submerged in water. The endless chain 21 is provided so as to stand obliquely on both sides in the width direction of the sand basin 1 and is wound around a ground-side sprocket 211 and a pond bottom-side sprocket 212 as shown in FIG. Yes. When the endless chain 21 is driven, the rake 22 enters and exits the water. The filtration screen 23 is disposed on the downstream side of the endless chain 21. The filtration screen 23 has bars extending in the vertical direction arranged with a predetermined mesh width (for example, 25 mm to 75 mm), and blocks the 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 referred to in the present invention. In this embodiment, the mesh width of the filtration screen 23 is set to 75 mm. The contaminants blocked by the filtration screen 23 are lifted up by the rake 22, and the lifted contaminants 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, a sand collecting pit 4 for collecting sand accumulated in the pond lower portion 1a is provided. Inside the sand collecting pit 4, a sand pump 41 is provided. The sand pump 41 is disposed in the vicinity of the bottom surface of the sand collecting pit 4, and conveys the sand collected in the sand collecting pit 4 to the outside of the sand basin 1. In other words, the sand pump 41 discharges the sand collected in the sand collecting pit 4 out of the water received in the settling basin 1. A sand raising pipe 42 is connected to the sand raising pump 41. Sand and sewage sucked by the sand pump 41 are sent to a sand setter (not shown) provided outside the settling basin 1 through a sand pipe 42, and the sand and sewage are separated by the sand set separator. In other words, the sand pump 41 corresponds to an example of a discharge unit that discharges contaminants outside the received water according to the present invention. As the sand raising pump 41 of the present embodiment, one having a discharge amount (discharge amount) of 2.0 m <3> / min is used.

  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 a pond lower portion 1 a (see FIG. 2) of the sand basin 1. The pond lower part 1 a is provided with an inclined surface 6 as described later, and a trough 3 is provided so as to be connected to the inclined surface 6. The sand in the sewage that has flowed into the sand basin 1 sinks toward the pond lower part 1a and accumulates in the pond lower part 1a.

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

  As shown in FIG. 1, the trough 3 is a groove provided in the center in the width direction of the sand basin 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 accumulated in the trough 3 is moved to the sand collecting pit 4 by the flow of water discharged from a discharge port described later. .

  Moreover, the sand basin 1 shown in FIGS. 1 and 2 also includes a transfer space forming member 8 in the trough 3. The total 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. Detailed description of the transfer space forming member 8 will be described later.

  Fig.3 (a) is BB sectional drawing in FIG. In FIG. 3A, the horizontal direction in the figure is the width direction of the trough 3.

  FIG. 3A shows the lower portion of the inclined surface 6 provided in the pond lower portion 1 a 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 of the trough 3 in the width direction. This inclined surface 6 is made of concrete inclined 45 degrees downward toward the trough 3, and extends in the longitudinal direction between the position upstream of the pump well 5 and the sand collecting pit 4. Yes. 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 total length of about 15 m having a cross-sectional shape of 3/4 arc, and has a demarcating surface 31 that delimits the deposition space S1 on the inner periphery. Yes. The trough 3 is formed by bending a plate material made of stainless steel or the like, but may be formed integrally with the inclined surface 6 from concrete. The cross-sectional shape of the trough 3 is not limited to an arc shape, and may be a U shape, a V shape, or the like. The trough 3 shown in FIG. 3A has a shape in which an upper (liquid level side) 1/4 of a cylindrical body having a diameter of about 356 mm is cut out, and is open upward. Hereinafter, the portion opening upward is referred to as the opening 3 a of the trough 3. In the deposition space S1 in the trough 3, the upper end portion 3b connected to the upper end opening 3a becomes narrower as it approaches the opening 3a. That is, the opening 3 a of the trough 3 is an opening that is narrowed in the width direction orthogonal to the extending direction of the trough 3.

  The sand contained in the sewage flowing into the sand 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 pond lower part 1 a, the sand that has settled on the inclined surface 6 further flows down toward the trough 3 along the inclined surface 6 and enters the deposition space S <b> 1 from the opening 3 a of the trough 3. Therefore, the sand that has settled in the pond lower part 1 a is first collected in the accumulation space S 1 of the trough 3.

  The transfer space forming member 8 shown in FIG. 3A has a 3/4 arc cross-sectional shape. This transfer space forming member 8 is formed by forming a stainless steel plate having a plate thickness of about 3 mm to 4 mm into a circular arc shape. The transfer space forming member 8 shown in FIG. 3A has a shape in which a lower part (side of the pond) 1/4 of a cylindrical body having a diameter of about 156 mm is cut out, and in the deposition space S1, the defining surface 31 is formed. It opens toward the bottom 31a. That is, the lower end of the transfer space forming member 8 is opened toward the bottom portion 31 a, and the opened 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 mesh width (75 mm here) of the screen member (here, the filtration screen 23) to 125 mm or less. In the embodiment, the length L is set to about 100 mm. Hereinafter, the length L of the suction port 81 in the width direction of the trough 3 may be simply referred to as the length L of the suction port. The suction port 81 is spaced from the defining 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. The upper end portion 82 of the transfer space forming member 8 is closed, but has an arc shape and is inclined downward. Sand also sinks to this transfer space forming member 8, but since it has an arc shape, it is difficult for sand to accumulate, and the sand that has settled on the transfer space forming member 8 passes through the arc-shaped side surface 80, It becomes easy to flow down toward the bottom part 31a of the delimiting surface 31. Further, due to the arc-shaped side surface 80, the transfer space S <b> 2 becomes narrower as the lower end portion connected to the suction port 81 approaches the suction port 81.

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

  FIG.3 (b) is CC sectional drawing in the same figure (a). 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 (sand collecting pit 4 side), and the left side is the downstream side (pump well 5 side).

  As shown in FIG. 3A, the transfer space forming member 8 has a lower end 83 on both sides of the suction port 81 supported by a support base 91. The support base 91 is made of concrete provided on the bottom 31 a that is the deepest part of the demarcation surface 31. As shown in FIG. 4B, the support base 91 includes an upstream inclined surface 911 and a downstream inclined surface 912, and 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. 5A, 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 portion 31a when the lower end 83 is supported by the support base 91. Similarly to the length L of the suction port 81, the interval C1 is also set within a range of not less than the mesh width (here 75 mm) of the screen member (here the filtration screen 23) and not more than 125 mm. In the present embodiment, the transfer space forming member 8 has its radial center positioned below the radial center of the trough 3, and the interval C1 is set to about 100 mm.

  In the present embodiment, in the width direction of the trough 3, the center in the radial direction of the transfer space forming member 8 coincides with the center in the radial direction of the trough 3, and the defining surface 31 of the trough 3 and the transfer space forming member 8 The gap C2 is ensured to be equal to or larger than the mesh width (here, 75 mm) of the screen member (here, the filtration screen 23) even at the narrowest position. In the present embodiment, the gap C2 is secured 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 (75 mm in this case) 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 31a, or between the demarcating surface 31 and the transfer space forming member 8. It can be suppressed.

  Further, the transfer space S2 in the transfer space forming member 8 is provided with a discharge port 7 for discharging a fluid into the transfer space S2. The discharge port 7 has a long hole shape in which the tip of a pipe-like water supply pipe 71 having a diameter of less than 50 mm is flattened. The maximum opening length in the lateral direction (trough width direction) of the discharge port 7 is about 60 mm. By making the discharge port 7 in such a flat shape, it is possible to ensure a wider range in which the flow velocity is higher than that of a perfect circle shape. In addition, the discharge port 7 may be obtained by flattening the tip of a water supply pipe having a diameter of about 80 mm. 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 to the vicinity of the opening 3 a of the trough 3 along the inclined surface 6, and then substantially horizontally toward the center in the width direction of the trough 3. It extends and further bends downward at the center of the trough 3 in the width direction, and this time passes through the transfer space forming member 8 and enters the transfer space S2.

  A portion 711 of the water supply pipe 71 that has entered the transfer space S2 extends downward to the horizontal plane 9231 of the support base 91 and is directed upstream (in the sand collecting pit 4 side) in the vicinity of the suction port 81 of the transfer space forming member 8. And horizontally bent so as to be placed on the horizontal surface 9131. A rectangular wrapping prevention plate 95 is erected on the upstream side (sand collecting pit 4 side) of the portion 711 that enters the transfer space S2 of the water supply pipe 71. The upstream side of the L-shaped portion 712 that extends substantially horizontally toward the center in the width direction of the trough 3, is bent downward at the center in the width direction of the trough 3, and extends downward to the transfer space forming member 8. A second anti-winding plate 96 obtained by bending a rectangular plate material into an L shape is attached to the (sand collecting pit 4 side). By these anti-winding plate 95 and the second anti-winding plate 96, string-like contaminants (for example, hair and vinyl strings) are added to the portion 711 and the L-shaped portion 712 of the water supply pipe 71 entering the transfer space S2. ) Is prevented from being wound. In addition, the part which extended along the inclined surface 6 of the water supply pipe 71 can suppress that a string-shaped contaminant is wound by making the inclined surface 6 contact.

  The discharge port 7 of the present embodiment is located below the center in the radial direction of the transfer space forming member 8, and specifically, slightly above the suction port 81 or substantially 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 discharge direction, and the left side of the figure is the upstream side in the discharge direction. The vertical position of the discharge port 7 may be the same as the center of the transfer space forming member 8 in the radial direction, or may be above the center of the transfer space forming member 8 in the radial direction. Here, the amount of water discharged from the discharge port 7 is set to be equal to or less than the discharge amount of the sand pump 41 (here, 2.0 m <3> / min). By setting the amount of water discharged from the discharge port 7 to be equal to or less than the discharge amount of the sand pump 41, it is possible to prevent the amount of water stored in the settling basin 1 from being inadvertently increased. The amount of water discharged from the discharge port 7 is preferably set to be larger than 0 and not more than 3.0 m <3> / min. The discharge port 7 of this embodiment is set so that about 1.5 m 3 / min of water is discharged.

  As water is discharged from the discharge port 7 into the transfer space S2 of the transfer space forming member 8, the sand accumulated in the accumulation space S1 in the trough 3 is as indicated by the curved arrow shown in FIG. The air is sucked into the transfer space S2 from the suction port 81. Here, since the suction port 81 is opened in the deposition space S1, sand accumulated in the deposition space S1 can be efficiently sucked into the transfer space S2. Moreover, even if the sand moving toward the downstream side in the discharge direction in the transfer space S2 leaks from the suction port 81 on the downstream side in the discharge direction, the sand tends to stay in the deposition space S1. Furthermore, 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 enters the transfer space S2 from the suction port 81. It can prevent becoming difficult to be inhaled. Further, since the vertical distance C1 between the suction port 81 and the bottom 31a is set to be within 125 mm, the distance C1 is too large, and the sand accumulated in the deposition space S1 is difficult to be sucked into the transfer space S2. It is suppressed. Further, in the transfer space S2, the sucked sand moves toward the downstream side in the discharge direction (the sand collecting pit 4 side) by the flow of water discharged from the discharge port 7. As shown in FIG. 3, the suction port 81 is an opening constricted 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 thus narrowed, the sand that moves in the transfer space S2 is less likely to go out of the transfer space S2, and the roll-up of the sand is further suppressed. Moreover, it becomes easy to maintain the flow of water in the transfer space S2, and the sand can be moved farther. Furthermore, by making the length L of the suction port 81 within 125 mm, it is difficult for the sand moving in the transfer space S2 to come out of the transfer space S2, and the sand roll-up is further suppressed. Moreover, even if the discharge amount of water from the discharge port 7 is set to 3.0 m <3> / min or less, the sand moving in the transfer space S <b> 2 can be made difficult to come out of the transfer space S <b> 2.

  The structure of the discharge port 7 in the support base 91 described above is the same in any of the support bases 91 provided with an interval of about 5 m in the extending direction of the trough 3 shown in FIGS. Hereinafter, the discharge port 7 provided on the most upstream side in the discharge direction is referred to as an upstream discharge port, the discharge port 7 provided on the most downstream side in the discharge direction is referred to as a downstream discharge port, and the upstream discharge port and the downstream discharge port The discharge ports 7 provided between the two are sometimes referred to as intermediate discharge ports.

  In the sand basin 1 of the present embodiment, when the sewage flowing into the sand basin 1 passes through the dust remover 2 shown in FIG. 2, among the contaminants mixed in the sewage, the mesh width of the filtration screen 23 (here In this case, contaminants larger than 75 mm are removed. The sewage that has passed through the dust remover 2 passes the sand collection pit 4, reaches the upstream end of the trough 3, and further flows in the extending direction of the trough 3. While the sewage flows through the upstream portion of the trough 3, most of the sand contained in the sewage sinks into the pond lower part 1 a of the sand basin 1. Some sand settles in the sand collecting pit 4 and some sand settles on the inclined surface 6, and the sand settled on the inclined surface 6 flows down further toward the trough 3 along the inclined surface 6. Further, the sand that has settled down to the upper end portion 82 of the transfer space forming member 8 flows down toward the bottom 31 a of the defining surface 31 through the arc-shaped side surface 80 of the transfer space forming member 8. 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 collection 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 settling basin 1 by a sand pump 41.

  Next, the modification of the sand settling basin 1 shown in FIGS. 1-3 is demonstrated. In the modified example described below, differences from the embodiment shown in FIGS. 1 to 3 will be mainly described, and the component having the same name as the component in the embodiment shown in FIGS. The description will be given with the reference numerals used so far, and redundant description may be omitted.

  Fig.4 (a) is sectional drawing which shows the aspect corresponding to Fig.3 (a) in the 1st modification of a sand basin. In FIG. 4A as well, the horizontal direction in the figure is the width direction of the trough. In this modification, the point from which the transfer space formation member is mainly comprised by a part of trough is different from embodiment shown in FIGS. 1-3.

  As shown in FIG. 4A, the trough 3 'has a first arcuate member 30a and a second arcuate member 30b each having a cross section of 5/8 arc. The first arc-shaped member 30a and the second arc-shaped member 30b are formed by cutting out a part of a pipe material made of stainless steel or the like. The first arcuate member 30a is a portion between 9 o'clock and 1 o'clock and 2 o'clock (3/8) pointed by the short hand of the watch in a pipe member having a thickness of about 3 mm to 4 mm and a diameter of about 250 mm. (Arc) is cut out. Further, the second arcuate member 30b is a pipe member having a thickness of about 3 mm to 4 mm and a diameter of about 150 mm, and is a portion between 3 o'clock and 5 o'clock to 9 o'clock (3 / 8 arcs). The trough 3 'is formed by abutting and joining the end corresponding to 9 o'clock of the second arcuate member 30a with the end corresponding to 9 o'clock of the second arcuate member 30b. A portion of the first arcuate member 30a between the 9 o'clock and 7 o'clock and 8 o'clock points (1/8 arc), and the second arcuate member 30b in the first arcuate member 30a, and the second arcuate member 30b 8 'is configured. That is, the transfer space forming member 8 'has a portion (6/8 arc) from 7 o'clock and 8 o'clock to 4 o'clock and 5 o'clock as indicated by the short hand of the timepiece. The transfer space forming member 8 ′ defines a transfer space S <b> 2 whose portion above the lower end is closed. Further, the first arcuate member 30a does not constitute the transfer space forming member 8 ', and is a portion between 4 o'clock and 8 o'clock and between 1 o'clock and 2 o'clock (4 / (8 arcs) is provided with a demarcation surface 31 that demarcates the deposition space S1. The bottom, which is the deepest part of the demarcation surface 31, has a bottom 31a. 4A, the left half of the defining surface 31 in the width direction is referred to as one end side 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 side of the defining surface 31. . That is, the transfer space forming member 8 ′ is connected to one end side in the width direction of the defining surface 31, while being separated from the other end side in the width direction of the defining surface 31. Thereby, the member which supports transfer space formation member 8 'can be abbreviate | omitted, and sedimentation of the sand in deposition space S1 is inhibited by the member which supports transfer space formation member 8' over the full length of trough 3 '. It will not be. Further, the space between the other end side of the demarcating surface 31 and the transfer space forming member 8 ′ is opened upward, and the portion opened upward is an opening 3 a of the trough 3 ′.

  The transfer space forming member 8 ′ is opened downward, and the portion opened downward is a suction port 81 of the transfer space forming member 8 ′. That is, the suction port 81 is opened in the deposition space S <b> 1 and is opened toward the bottom portion 31 a of the defining surface 31. The length L of the suction port 81 and the vertical interval C1 between the suction port 81 and the bottom 31a are both in the range of the mesh width (75 mm here) of the filtration screen 23 shown in FIGS. 1 and 2 to 125 mm or less. 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 arcuate member 30 a having a diameter of approximately 250 mm and the second arcuate member 30 b having a diameter of approximately 150 mm. Therefore, the gap C2 between the other end side of the defining surface 31 and the transfer space forming member 28 is about 100 mm. That is, the gap C2 is not less than the mesh width (75 mm here) of the filtration screen 23 shown in FIGS. 1 and 2 and not more than 125 mm. In this modification, since a part of the trough 3 ′ constitutes the transfer space forming member 8 ′, it is easy to secure a gap C2 between the other end side of the demarcating surface 31 and the transfer space forming member 28. As a result, The size of the trough 3 ′ in the width direction can be suppressed. 4A, the gap C2 between the other end side of the defining surface 31 and the transfer space forming member 28 is in the width direction between the other end side of the defining surface 31 and the transfer space forming member 28. It is an interval.

  FIG.4 (b) is DD sectional drawing in the figure (a). In FIG. 4B, 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 (sand collecting pit 4 side), and the left side is the downstream side.

  As shown in FIG. 4A and FIG. 4B, the lower end portion of the water supply pipe 71 ′ extending down to the transfer space forming member 8 ′ penetrates the upper end portion 82 of the transfer space forming member 8 ′. , Communicated with the transfer space S2. Further, a discharge port 7 ′ that discharges fluid into the transfer space S <b> 2 is provided in a region in the transfer space S <b> 2 where the water supply pipe 71 ′ communicates. The discharge port 7 ′ is formed by partitioning the upper portion of the transfer space S <b> 2 in the transfer space forming member 8 ′ with a partition member 72. The partition member 72 has a horizontal portion 721 extending in a horizontal state in the extending direction of the trough 3 ′, and an inclined portion 722 inclined upward from an end portion on the downstream side of the horizontal portion 721. . The horizontal portion 721 is connected to both sides of the inner circumferential surface of the transfer space forming member 8 ′ in the width direction across the upper end portion, and the upstream end (sand collecting pit 4 side) end portion is the lower end portion of the water supply pipe 71. It is located on the upstream side. In addition, the inclined portion 722 has an end portion on the downstream side connected to the downstream side of the inner peripheral surface of the transfer space forming member 8 ′ to the lower end portion of the water supply pipe 71, and the discharge port 7 ′. The downstream side is blocked. As a result, the region where the water supply pipe 71 ′ communicates in the transfer space S <b> 2 of the transfer space forming member 8 ′ is partitioned by the partition member 72. In this modification, the discharge port 7 shown in FIG. 3 may be used in place of the discharge port 7 ′ shown in FIGS. 4A and 4B.

  From the discharge port 7 ′, water supplied from the water supply pipe 71 ′ is discharged in the horizontal direction or the substantially horizontal direction toward the upstream side (see the right-pointing 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 S 2 of the transfer space forming member 8 ′, the sand accumulated in the deposition space S 1 is drawn into the suction port as indicated by the curved arrow shown in FIG. 81 is sucked into the transfer space S2. Further, in the transfer space S2, the sucked sand moves toward the downstream side in the discharge direction (the sand collecting pit 4 side) by the flow of water discharged from the discharge port 7 '.

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

  FIG. 5: is sectional drawing which shows the state which cut | disconnected the sand basin of the 2nd modification 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 no trough is provided at the bottom of the pond.

  As shown in FIG. 5, a flat bottom surface 12 is provided in the pond lower portion 1 a of the sand basin 1. Moreover, the inclined surface 11a inclined so that it may spread in the width direction is provided in each lower end part of a pair of opposing side wall 11 of the sand basin 1 toward upper direction. The lower end portions of the inclined surfaces 11 a are connected to the bottom surface 12. A deposition space forming member 13 is disposed at the center of the bottom surface 12 in the width direction. The deposition space forming member 13 has an angle shape including a pair of inclined pieces connected at substantially right angles. The deposition space forming member 13 has a corner portion facing upward, and each tip portion is fixed to the bottom surface 12. The deposition space forming member 13 extends in the entire longitudinal direction of the pond lower portion 1a. In the second modification, two deposition spaces S1 respectively extending in the entire longitudinal direction of the pond lower portion 1a are defined by the inclined surface 11a of the side wall 11, the deposition space forming member 13, and the bottom surface 12. That is, the portion between the inclined surface 11a and the deposition space forming member 13 on the inclined surface 11a, the deposition space forming member 13, and the bottom surface 12 corresponds to a demarcation surface in the present invention. In addition, the inclined surface 11a and the deposition space forming member 13 correspond to the inclined portion referred to in the present invention, and the portion of the bottom surface 12 between the inclined surface 11a and the deposited space forming member 13 is the bottom portion referred to in 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 that has flowed into the sand basin 1 sinks toward the pond lower portion 1a and enters the deposition space S1, flows down along the inclined surface 11a of the side wall 11 and the deposition space forming member 13, and enters the deposition space S1. accumulate. Here, the inclination angle of the inclined surface 11a of the side wall 11 and the deposition space forming member 13 is not particularly limited, but in this modification, both are set to 45 degrees. The deposition space forming member 13 is made of metal such as stainless steel, but may be formed integrally with the bottom surface 12 from concrete. Moreover, the inclined surface 11a of the side wall 11 and the deposition space forming member 13 may have an arcuate cross-sectional shape.

  In each deposition space 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 base 91 is the same as the support base 91 shown in FIG. 3, and a plurality of support bases 91 are provided at intervals of about 5 m in the longitudinal direction of the pond lower portion 1a. The water supply pipe 71 ″ extends upward from the lower side of the support base 91, penetrates the horizontal plane 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 plane 9131. Yes. The discharge port 7 is also in the shape of a flat long hole.

  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 mesh width (here 75 mm) of the screen member (here, the filtration screen 23) and not more than 125 mm. 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 distance C1 between the suction port 81 and the bottom 31a is also set within the range of the screen member (here, the filtration screen 23) between the mesh width (here 75 mm) and 125 mm or less. C1 is about 100 mm.

  The bottom portion 12 a is longer in the width direction than the suction port 81 in the width direction. In addition, in both the portion where the inclined surface 11a is connected to the bottom portion 12a and the portion where the deposition space forming member 13 is connected to the bottom portion 12a, the distance D in the width direction from the suction port 81 is set to 125 mm or less. Then, it is about 80 mm. Thereby, it is possible to prevent the sand accumulated in the accumulation space S1 from being easily sucked into the transfer space S2 due to the distance from the suction port 81 being increased.

  Further, the gap C22 between the transfer space forming member 8 and the inclined surface 11a in the direction orthogonal to the inclined surface 11a and the transfer space forming member 8 and the deposition space forming member 13 in the direction orthogonal to the deposition space forming member 13 are provided. 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) even in the narrowest part, and in this modification, the gaps C21 and C22 are secured about 100 mm.

  According to the sand settling basin 1 of the present embodiment described above, sand roll-up can be suppressed while the sand is sufficiently moved.

  Next, the sedimentation basin which is 2nd Embodiment of the transfer system of this invention is demonstrated. In the following description, components having the same names as the names of the components described so far will be described with the reference numerals used so far, and redundant descriptions may be omitted. The sedimentation basin is located on the downstream side of the sedimentation basin in the sewage treatment system, accepts the sewage from which sand has been removed by the sedimentation basin, settles the sludge contained in the received sewage, and then sinks the sedimented sludge into the sludge pit. Is removed from the sewage.

  FIG. 6 is a plan view of a sedimentation basin as a second embodiment of the transfer system of the present invention as viewed from above. 7 is an EE cross-sectional view of the sedimentation basin shown in FIG. 6, and FIG. 8 is an FF cross-sectional view of the sedimentation basin shown in FIG.

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

  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). (See the straight arrow shown in Figure 2). That is, the longitudinal direction of the settling basin is the direction of water flow, and in FIGS. 6 and 7, the right side of the figure is the upstream side and the left side is the downstream side. This sedimentation basin 10 extends in the width direction and is located on the upstream side, an upstream wall 10h, a pair of side walls 10c (see FIG. 6) that extends in the longitudinal direction, and extends in the width direction and is located on the downstream side. 10 g of downstream walls, the length of the longitudinal direction is about 35 m, and the length of 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. Moreover, as shown in FIG. 6, the upstream wall 10h is provided with an opening 100h communicating with a water conduit (not shown).

  As shown in FIGS. 6 and 8, a sludge pit 14 is provided in the center portion in the width direction on the upstream side of the settling 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 disposed 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 outside the sedimentation basin 10. In other words, the sludge pump corresponds to an example of a discharge unit according to the present invention that discharges contaminants out of the received water. The sludge pump of this embodiment has a discharge amount (discharge amount) of 2.0 m <3> / min. Further, 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 in the width direction of the sludge pit 14. Each of these accumulation grooves 141 is a groove having a width of about 4 m in the longitudinal direction of the settling basin 10 and having a length of about 10 m in the width direction of the settling basin 10. . As shown in FIGS. 7 and 8, groove bottom surfaces 104 are provided at the bottoms of the integrated grooves 141, respectively. As shown in FIG. 8, the groove bottom surface 104 of each accumulation groove 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 divided into four regions by three partition walls 10d extending in the longitudinal direction. A pond lower part 10a is provided. As shown in FIGS. 7 and 8, a ceiling 10e is provided on the upstream portion of the pond lower portion 10a and above the sludge pit 14 and the accumulation groove 141. In FIG. 6, the ceiling 10 e is omitted in order to show the accumulation groove 141.

  On each bottom surface 102 of the pond lower part 10a shown in FIG. 7, 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 part 10a. It is arranged in the existing state. As shown in FIG. 8, the inclined surface 11a shown in FIG. 5 is not provided at the lower end portion of the side wall 10c of the present embodiment, and the inclined surface is not provided at the lower end portion of the partition wall 10d. . In the present embodiment, the second deposition space forming member 131 made of one inclined piece is disposed at both end portions in the width direction of the bottom surface 102 of the pond lower part 10a. In the present embodiment, as shown in FIG. 8, the deposition space forming member 13 and the second deposition space forming member 131 form four deposition spaces S3 arranged in the width direction in each pond lower portion 10a. ing. In addition, an inclined surface may be provided at the 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 flows into the area of the sedimentation basin 10 partitioned by the partition wall 10d settles toward the respective pond lower part 10a and enters the deposition space S3, and the deposition space forming member 13 and the second deposition space. It flows down along the forming member 131. As a result, the settled sludge is deposited on the portion of the bottom surface 102 between the deposition space forming member 13 and the deposition space forming member 13 or the portion between the deposition space forming member 13 and the second deposition space forming member 131. To do. These portions correspond to the bottom portion referred to in the present invention, and these portions are hereinafter referred to as a first bottom portion 102a. That is, the 1st bottom part 102a, the deposition space formation member 13, and the 2nd deposition space formation member 131 are equivalent to the demarcation surface said to this 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. 3 is arranged in each of the plurality of deposition spaces S3 in the pond lower part 10a shown in FIGS. . Further, a support member 29 that supports 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 member 28 is disposed on the first bottom portion 102a at the center in the width direction in each of the deposition spaces S3. Moreover, as shown in FIGS. 6 and 7, the transfer space forming member 28 extends along the longitudinal direction of the settling basin 10, and the entire length of the transfer space forming member 28 is in the longitudinal direction of the pond lower portion 10a. It is the same as the length. These transfer space forming members 28 are supported by the support member 29 and the attachment frame 26 in a state of being separated from the first bottom portion 102a. The attachment frame 26 has a U-shaped cross section, and extends in the width direction of the settling basin 10 in each of the areas partitioned by the partition wall 10d in the settling basin 10 as shown in FIGS. It is a thing. As shown in FIG. 6, a plurality of mounting frames 26 are arranged at intervals in the longitudinal direction of the sedimentation tank 10. Both ends of the mounting frame 26 are supported by receiving frames 261. These receiving frames 261 are fixed to portions above the water surface in each of the side wall 10c and the partition wall 10d. Support members 29 are suspended from the attachment frames 26 supported by the receiving frames 261, respectively. As shown in FIG. 8, a plurality of support members 29 are provided in a state extending in the vertical direction at each position corresponding to the transfer space forming member 28 in each region partitioned by the partition wall 10d. Further, 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 attachment frames 26 in the longitudinal direction.

  As shown in FIG. 7, each pond lower part 10 a is provided with a water supply pipe 271 connected to the upper end portion of the transfer space forming member 28 with an interval of about 6 m in the longitudinal direction. Similar to the water supply pipe 71 shown in FIG. 3, these water supply pipes 271 are bent to the upstream side (the sludge pit 14 and the accumulation groove 141 side) after passing through the transfer space forming member 28 and entering the transfer space forming member 28. A discharge port 27 having the same shape as the discharge port 7 shown in FIG. 3 is formed (see FIG. 8). Accordingly, in the second embodiment, five discharge ports are provided in the respective transfer space forming members 28 with an interval of about 6 m in the longitudinal direction. From these discharge ports, the water supplied from the water supply pipe 271 is discharged in the horizontal direction or the 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 FIGS. 6 and 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. In FIG. 6 and FIG. 8, the water supply pipe 271 is omitted to simplify the drawing.

  FIG. 9A is an enlarged view showing the G portion in FIG. 8 in an enlarged manner, and FIG. 9B is an enlarged view showing the H portion in FIG. 8 in an enlarged manner. 9A and 9B, the horizontal direction of the figure is the width direction of the settling basin 10. FIG. 7 has the same structure as the G part in FIG. 8, and therefore, in FIG. 9A, the reference numeral of the I part in FIG. There are things to do. 7 has the same structure as the H portion in FIG. 8, and therefore, the reference numerals of the H portion 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 the vertical direction, a lower screw member 292 attached to the lower end of the pipe member 291, and a pipe member. And an upper screw member 293 attached to the upper end of 291. As shown in FIG. 9A, a cylindrical portion 283 having a threaded inner periphery is provided at the upper end portion of the transfer space forming member 28. The lower screw member 292 of the support member 29 is 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 support member 29 by being tightened with nuts N from above and below the attachment frame 26 in a state of being inserted into holes formed in the attachment frame 26. It is suspended from the frame 26. Thus, the transfer space forming member 28 that forms the transfer space S4 is supported, and the suction port 281 of the transfer space forming member 28 opens toward the first bottom portion 102a in the deposition space S3. Even when the supporting member 29 is in a state where sewage is accumulated in the sedimentation basin 10, the supporting member 29 can be removed from the mounting frame 26 and the removed supporting member 29 can be pulled up. Thereby, the transfer space forming member 28 and the discharge port 27 can also 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, in the sedimentation basin 10, the screen member like the filtration screen 23 shown in FIG.1 and FIG.2 is not provided in many cases. A sedimentation basin that receives sewage that does not contain sand may be provided with a screen member instead of being provided with a sedimentation basin on the upstream side. That is, in the sedimentation basin 10, it is less necessary to consider that the contaminants are clogged in the suction port 281 or the like compared to the sedimentation basin. For this reason, the length L of the suction port 281 and the interval C1 between the suction port 281 and the first bottom portion 102a are within a range in which sludge is not easily sucked 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 set as appropriate 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. Further, in the transfer space forming member 28 shown in FIG. 9A, the vertical interval 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 support member 29 can adjust the position in the vertical direction 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.

  Furthermore, the distance D in the width direction between the portion where the second deposition space forming member 131 is connected to the first bottom portion 102a and the suction port 281 and the portion where the deposition space forming member 13 is connected to the first bottom portion 102a and the suction port 281 Any of the distances D in the width direction can be appropriately set within a range of 125 mm or less that does not make it difficult to suck sludge into the transfer space forming member 28 when water is discharged from the discharge port 27. In the transfer space forming member 28 shown in FIG. 9A, both distances D are set to about 50 mm. Further, the gap C21 between the transfer space forming member 28 and the deposition space forming member 13 in the direction orthogonal to the deposition space forming member 13 and the transfer space forming member 28 and the second one in the direction orthogonal to the second deposition space forming member 131. 2 The clearance C23 with the deposition space forming member 131 is about 80 mm at the narrowest portion. In addition, the winding prevention board 95 shown in FIG. 3 is not provided in the part 2711 which entered into transfer space S4 of the water supply pipe | tube 271 shown to Fig.9 (a). The reason for this is that string-like contaminants are removed in the settling basin, and the sewage received by the settling basin 10 contains almost no string-like contaminants, so it is necessary to prevent such string-like contaminants from being wrapped. This is because there is little nature. Here, when the sand basin is not provided on the upstream side of the settling basin 10, a wrapping prevention plate similar to the wrapping prevention plate 95 shown in FIG. 3 enters the transfer space S4 of the water supply pipe 271. It is preferable to provide in the part 2711.

  Further, when a screen member is provided in the sedimentation basin 10, the length L of the suction port 281, the distance C 1 between the suction port 281 and the first bottom portion 102 a, and the transfer in the direction orthogonal to the deposition space forming member 13. A gap C21 between the space forming member 28 and the deposition space forming member 13 and a gap C23 between the transfer space forming member 28 and the second deposition space forming member 131 in a direction orthogonal to the second deposition space forming member 131 are respectively screened. It is preferable that the width of the member is equal to or less than the mesh width.

  Next, the accumulation groove 141 will be described. As shown in FIG. 7, a plurality of deposition space forming members 13 ′ and second deposition space forming members 131 ′ are arranged on the groove bottom surface 104 of each of the pair of integrated 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. Has 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 deposition spaces S5 are formed in each of the pair of accumulation grooves 141 with the sludge pit 14 interposed therebetween. As shown in FIG. 9A, in each of these deposition spaces S5, the transfer space forming member 28 ′ is supported by the support member 29 ′ in the same manner as the deposition space S3 of the pond lower portion 10a shown in FIGS. The suction port 281 of the transfer space forming member 28 'opens 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 Width between the suction port 281 and the portion where the second space 104 is connected to the second bottom portion 104a and the space C21 between the transfer space forming member 28 'and the second space forming member 131'. 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 ′ is connected to the second bottom 104a and the suction port 281 are the same as those in the pond lower part 10a. As shown in FIG. 6, the mounting frame 26 ′ in which the support member 29 ′ is suspended in the accumulation groove 141 extends in the longitudinal direction of the settling basin 10 above the accumulation groove 141. They are arranged at a predetermined interval in the width direction. In the present embodiment, three attachment frames 26 ′ are arranged in each accumulation groove 141. As shown in FIGS. 6 and 8, among the three attachment frames 26 ′, the attachment 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 of the partition wall 10d is supported by a receiving frame 261 'fixed to the upstream surface of the partition wall 10d. Moreover, as shown in FIG. 6 and FIG. 7, each of the two attachment frames 26 ′ arranged on the outer side in the width direction of the settling basin 26 ′ of the three attachment frames 26 ′ It is supported by the receiving frame 261 ′ fixed to the upstream wall 10h of the pond 10, and the downstream end portion is supported on the most upstream mounting frame 26 ′ in the pond lower portion 10a. A support member 29 'is suspended from each of the mounting frames 26'.

  As shown in FIG. 8, each of the transfer space forming members 28 ′ provided in the accumulation groove 141 has a water supply pipe 271 ′, an outer end portion in the width direction of the settling basin 10, and the width direction of the settling basin 10. It is connected to the middle part. Similar to the water supply pipe 71 shown in FIG. 3, these water supply pipes 271 ′ penetrate the transfer space forming member 28 ′ and enter the transfer space forming member 28 ′, and then enter the width direction center side (sludge pit 14 side). Bent and the same outlet 27 ′ (see FIG. 9A) as the outlet 7 shown in FIG. 3 is formed. Accordingly, in the present embodiment, two discharge ports 27 ′ are provided in the respective transfer space forming members 28 ′ with an interval of about 5 m in the longitudinal direction. From these discharge ports 27 ′, water supplied from the water supply pipe 271 ′ is discharged horizontally or substantially horizontally 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 settling basin 10 is the upstream side in the discharge direction, and the inner side in the width direction (the sludge pit 14 side) of the settling basin 10 is the downstream side in the discharge direction. In FIGS. 6 and 7, the water supply pipe 271 ′ is omitted in order to simplify the drawings.

  The sewage flowing into the settling basin 10 passes through the sludge pit 14 and the accumulation groove 141, reaches the upstream end of each pond lower part 10a, and further flows along the extending direction of each pond lower part 10a. While the sewage flows, the sludge contained in the sewage sinks into the sludge pit 14, the accumulation groove 141, and the pond lower part 10a. The sludge settled in the accumulation groove 141 flows down to the second bottom portion 104a in the deposition space S5 through the deposition space forming member 13 'and the second deposition space forming member 131'. Further, it flows down to the second bottom portion 104a along the outer peripheral surface of the transfer space forming member 28 '. Thus, sludge accumulates in the accumulation space S5. Moreover, the sludge settled in the pond lower part 10a flows down to the 1st bottom part 102a in deposition space S3 along the deposition space formation member 13 and the 2nd deposition space formation member 131. Moreover, it flows down to the 1st bottom part 102a in the deposition space S3 along the outer peripheral surface of the transfer space formation member 28. Thus, sludge accumulates in the accumulation space S3.

  In each pond lower part 10a, water is discharged from the discharge port 27 into the transfer space S4 of the transfer space forming member 28, so that the sludge accumulated in the accumulation space S3 is as indicated by the curved arrows shown in FIG. The air 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 (the sludge pit 14 and the accumulation groove 141 side) by the flow of water discharged from the discharge port 27. To do. In each pond lower part 10a, for example, among a plurality of discharge ports 27 provided at intervals in the longitudinal direction, the discharge direction most upstream side (the most downstream side in the water flow of the settling basin 10) to the discharge direction downstream side. The water can be sequentially discharged for about 3 minutes (upstream in the water flow of the sedimentation basin 10), and the sludge accumulated in the deposition 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 obtained. 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 (sludge pit 14 side) by the flow of water discharged from the discharge port 27'. In the accumulation groove 141, for example, water is discharged from a discharge port 27 ′ on the upstream side in the discharge direction (outside in the width direction of the sedimentation basin 10) for about 3 minutes, and then the discharge port 27 on the downstream side in the discharge direction (sludge pit 14 side). By discharging water from about 3 minutes, sludge accumulated in the accumulation space S5 can be moved to the sludge pit 14.

  The discharge amount of water discharged from the discharge ports 27 and 27 ′ of the present embodiment is preferably less than or equal to the discharge amount of the sludge pump (here 2.0 m 3 / min), greater than 0 and less than 3.0 m 3 / min. You may set in the range. Further, since the sludge is in the form of a mud having a particle diameter smaller than that of sand and is easier to move than sand, the sludge is sufficiently moved with a discharge amount smaller than the discharge amount of water at the discharge port 7 shown in FIG. Can do. For this reason, it can be set to about 1/3 of the discharge amount of the water discharged from the discharge port 7 shown in FIG. 3, for example, the discharge amount of the water discharged from the discharge ports 27 and 27 ′ of the present embodiment is set. , About 0.5 m 3 / min. Further, the discharge flow rate at the discharge ports 27 and 27 ′ of the present embodiment can be set to about 1/3 of the discharge flow rate of water at the discharge port 7 shown in FIG. 3, for example.

  According to the sedimentation basin 10 of 2nd Embodiment demonstrated above, the rolling-up of sludge can be suppressed, moving sludge fully.

  Note that the gaps C2, C21, C22, and C23 that have been described so far have a length in a direction that is orthogonal to the ejection direction and excludes the vertical direction.

  The present invention is not limited to the above-described embodiment, and various modifications 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 generated in the factory or the like may be moved in one direction and collected at a predetermined place. Moreover, the sedimentation basin 10 of the second embodiment includes a plurality of pond lower portions 10a partitioned by a partition wall 10d and an accumulation groove 141 connected to the sludge pit 14, but one pond lower portion 10a and sludge. It may be a sedimentation basin provided with pits 14 and not provided with accumulation grooves 141.

  In addition, even if it is a structural requirement contained only in each description of embodiment and the modification demonstrated above, you may apply the structural requirement to another embodiment and a modification.

DESCRIPTION OF SYMBOLS 1 Sedimentation basin 10 Sedimentation basin 1a, 10a Pond lower part 13 Accumulation space formation member 23 Filtration screen 3 Trough 31 Definition surface 31a Bottom part 4 Sand collection pit 41 Sand pump 6 Sloping surface 7, 27 Discharge port 8, 28 Transfer space formation member 81 , 281 Suction port 14 Sludge pit 141 Accumulation groove 29 Support member S1, S3, S5 Deposition space S2, S4, S6 Transfer space

Claims (3)

A transfer system in which a sedimentation space is provided in which contaminants contained in the received water settle, and the contaminants deposited in the deposition space are transferred;
A transfer space forming member having a transfer space closed by an upper end portion, and provided with a suction port spaced from a defining surface defining the deposition space below the upper end portion;
A discharge port for discharging fluid in the transfer space;
The suction port opens in the deposition space, and functions as an opening for sucking the contaminants accumulated in the deposition space into the transfer space by discharging fluid from the discharge port,
The transfer space forming member functions as a path through which contaminants sucked into the transfer space move toward the downstream side in the discharge direction of the fluid by discharging the fluid from the discharge port.
The transfer system, wherein the transfer space forming member has an arc shape at the upper end. A groove having the demarcation surface on the inner periphery and opening upward;
The transfer system according to claim 1, wherein the transfer space forming member has the upper end portion positioned below the opening of the groove.   The transfer system according to claim 1 or 2, wherein the transfer space is such that a lower end portion connected to the suction port becomes narrower as it approaches the suction port.