JPH025122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in multilayer sedimentation tanks used in sewage treatment plants.

In recent years, with the development of urban sewage systems, the number of sewage treatment plants being constructed in the suburbs of cities has increased. At sewage treatment plants, settling basins are installed to settle solids contained in sewage. This settling basin allows sewage to flow slowly over a long period of time to precipitate solids, and an outflow gutter equipped with an overflow weir is installed in the pond to allow supernatant water to flow into the outflow gutter. In this way, sedimentation ponds require vast areas of land because sewage flows slowly over long periods of time. However, due to high land prices in the suburbs of cities, it has become increasingly difficult to secure large plots of land. Therefore, without impairing the capacity of the sedimentation basin,
It was requested that only the site be reduced.

One way to meet these demands is to divide the sedimentation tank into an upper chamber and a lower chamber.
It was proposed to double or more utilize the site. In this proposed method, the water in the upper chamber can be drained out using the conventional method, but the drawback is that there is no suitable method for draining the water in the lower chamber at the same flow rate as the water in the upper chamber. It was hot.

In order to drain the water in the lower chamber, the inventor provided many horizontal pipes with holes in the lower chamber, connected the vertical pipes to the horizontal pipes, and connected the upper end of the vertical pipe to the upper edge of the overflow weir in the upper chamber. The opening is made at approximately the same height as the flow part, so that the water in the lower chamber overflows from the upper end of the vertical pipe, and if many such vertical pipes are installed side by side, the water in the lower chamber will flow as much as the water in the upper chamber. I realized that it is possible to make it flow out at a certain amount. I also realized that it would be convenient if the height of the upper end of the vertical tube could be adjusted in order to adjust the amount of water flowing out of the lower chamber. This invention was made based on such knowledge.

That is, this invention, as a first invention, divides the pond into an upper chamber and a lower chamber by providing a floor plate midway in the depth direction of the pond, providing an outflow gutter in the upper chamber, and providing an overflow to the side edge of the outflow gutter. In a multi-layer sedimentation basin equipped with a flow weir and one end of the outflow gutter connected to a discharge groove, a number of horizontal pipes are installed in the lower chamber, and the horizontal pipes are positioned above the center of the lower chamber in the depth direction. A large number of small holes are drilled in the wall of the pipe, the vertical pipe is connected to the horizontal pipe, the vertical pipe is passed through the wall of the drainage ditch, the upper end protrudes into the ditch, and the upper end is inserted over the upper edge of the overflow weir. To provide a multi-layer sedimentation tank which is opened at approximately the same height as the flow section and has a large number of such vertical pipes erected in a discharge groove.

In addition, as a second invention, a floor plate is provided halfway in the depth direction of the pond to divide the pond into an upper chamber and a lower chamber, an outflow gutter is provided in the upper chamber, and an overflow weir is attached to the side edge of the outflow gutter. In a multilayer sedimentation tank in which one end of the outflow gutter is connected to the discharge groove, a number of horizontal pipes are installed in the lower chamber, and the horizontal pipes are located above the center of the lower chamber in the depth direction, and the pipe walls of the horizontal pipes are A large number of small holes are drilled in the
Connect the vertical pipe to the horizontal pipe, pass the vertical pipe through the wall of the discharge groove, make the upper end protrude into the groove, attach a short pipe that slides up and down to the upper end, and connect the upper end of the short pipe to the top of the overflow weir. A multi-layer sedimentation basin is provided that is movable above and below the level of the edge runoff.

The multilayer sedimentation tank according to the present invention will be explained as follows based on the drawings. FIG. 1 is a partially cutaway perspective view showing an example of a multilayer sedimentation tank according to the present invention. FIG. 2 is a partially cutaway sectional view showing another example of the multilayer sedimentation tank according to the present invention. Third
5 through 5 are cross-sectional views showing an example of the short tube moving mechanism according to the present invention. FIG. 6 is a partially cutaway perspective view showing another example of the short tube moving mechanism according to the present invention.

First, the basic structure of the multilayer sedimentation basin according to the first invention will be explained. In FIG. 1, a floor plate 11 is attached midway in the depth direction of a pond 1, and the interior of the pond is divided into an upper chamber 12 and a lower chamber 13. Upper chamber 12
A large number of outflow gutters 2 are provided inside. An overflow weir 21 is attached to the side edge of the outflow gutter 2. One end of the outflow gutter 2 is connected to the discharge groove 3. A large number of horizontal pipes 4 are provided in the lower chamber 13. The horizontal pipe 4 is located above the center of the lower chamber 13 in the depth direction. A large number of small holes 41 are bored in the wall of the horizontal pipe 4. A vertical tube 5 is connected to one end of the horizontal tube 4. The vertical pipe 5 penetrates the wall of the discharge groove 3 and has an upper end protruding into the discharge groove 3. Its upper end opens at a height approximately equal to the upper edge overflow part of the overflow weir 21 (the bottom of the depression in the figure). Vertical pipe 5
are installed in large numbers in a row inside the drainage ditch.

Next, the basic structure of the multilayer sedimentation basin according to the second invention will be explained. In FIG. 2, a floor plate 11 is attached midway in the depth direction of the pond 1 to divide the interior of the pond into an upper chamber 12 and a lower chamber 13. Upper chamber 12
An outflow gutter 2 is provided inside, and an overflow weir 21 is attached to the side edge of the outflow gutter 2. One end of the outflow gutter 2 is connected to the discharge groove 3. A large number of horizontal pipes 4 are provided in the lower chamber 13. these are,
It is located above the center of the lower chamber 13 in the depth direction. A large number of small holes 41 are bored in the wall of the horizontal pipe 4. A vertical pipe 5 is connected to the horizontal pipe 4. The vertical tube 5 penetrates the wall of the discharge groove 3 and projects into the groove. A short tube 51 that slides up and down is attached to the upper end of the vertical tube 5. In this figure, a flange 52 and a bridge 53 are attached to the upper end of the short tube 51, a guide rod 54 is inserted through the flange 52, a threaded rod 55 is inserted into the threaded hole of the bridge 53, and the threaded rod 55 is inserted into the threaded hole of the bridge 53.
5 is rotated by a motor 6 equipped with a speed reducer 61 to move the bridge 53 up and down. In this way, the short pipe 51
The upper end is movable above and below the height of the upper edge overflow part of the overflow weir 21.

In the above sedimentation basin, the bottom, side walls, and floor plate 11 of the basin 1 are made of reinforced concrete. A plurality of floor plates 11 may be provided, and as a result, the lower chamber 13 may be divided into two or more layers. It is desirable that a large number of outflow troughs 2 be provided in parallel as shown in the figure. It is desirable that the overflow weir 21 exist over almost the entire length of the outflow gutter 2. To attach the overflow weir 21, it is convenient to fix an iron plate to the side wall of the outflow gutter 2 with bolts. At this time, it is desirable to contact the packing with the iron plate. Further, it is preferable that the height of the iron plate be adjustable by, for example, making the bolt insertion holes vertically elongated. Overflow weir 21
It is appropriate to provide the upper edge with a large number of inverted triangular or inverted trapezoidal notches, with the lower ends of the notches serving as overflow portions through which water overflows. The drain 3 can be branched or can be covered with a lid to form an underdrain.

A portion of the lower chamber 13 can be opened at the same height as the upper chamber. In this case, it is desirable that the open portion 14 be adjacent to the discharge groove 3 and provide an overflow weir 15 at the boundary with the discharge groove 3. The cross tube 4 is suitably made of iron or reinforced synthetic resin. It is desirable that the horizontal pipes 4 are arranged in parallel. In addition, the adjacent horizontal pipe 4
may be connected. Preferably, the small hole 41 is bored in the upper half of the wall of the horizontal tube. Vertical pipe 5
is made of the same material as the horizontal pipe. The vertical pipe 5 may penetrate either the bottom wall or the side wall of the drain groove. It is desirable that the number of vertical pipes 5 is the same as or more than the number of outflow gutters 2.

In order to facilitate the removal of precipitated solids, it is desirable to slope the upper surface of the floor plate 11 and the bottom surface of the lower chamber, or to provide a scraping device on the floor plate and the bottom surface. Further, the upper chamber 12 and the lower chamber 13 can be communicated with each other.

As a mechanism for moving the short tube 51 up and down, in addition to the mechanism shown in FIG. 2, the following mechanism can be used. In FIG. 3, there is a bridge 53 at the upper end of the short pipe 51.
Both ends of the bridge 53 protrude laterally and are fitted into a groove of a guide rod 54 having a U-shaped cross section. The lower end of a threaded rod 55 is fixed to the center of the bridge 53. The threaded rod 55 projects upward through a threaded hole in a horizontal bar 541 attached to the upper end of the guide rod 54, and has a manual handle 551 attached to its upper end. When the handle 551 is turned, the threaded rod 55 moves up and down, thereby causing the short tube 51 to move up and down. Note that the space between the short pipe 51 and the vertical pipe 5 is made airtight by an O-ring 511. Further, concrete 31 is filled between the walls of the vertical pipe 5 and the groove 3, and both sides thereof are made airtight with a sealing material 32 (for example, water-swellable rubber sealing material, foam, adhesive filler, etc.). .

In FIG. 4, a flange 52 and a bridge 53 are attached to the upper end of the short tube 51, and a guide rod 54 is inserted through the flange 52. A threaded rod 55 is inserted into the screw hole of the bridge 53, and a handle 551 is attached to the upper end of the screw rod 55.
is attached. When the handle 551 is turned, the bridge 53 moves up and down, thereby causing the short tube 51 to move up and down.
moves up and down. In addition, a gear 552 is attached to the threaded rod 55.
Another gear 55 is attached and meshes with the gear 552.
3, the needle 554 rotates on the scale plate 555 so that the height of the short tube 51 can be read. Between the short pipe 51 and the vertical pipe 5 is a U packing 51.
2 and is airtight.

In FIG. 5, a bridge 53 is attached to the upper end of the short pipe 51, and both ends of the bridge 53 protrude laterally.
It is inserted into a groove of a guide rod 54 having a U-shaped cross section. A threaded rod 55 is inserted into a threaded hole provided in the bridge 53, and the threaded rod 55 is connected to the guide rod 54.
It protrudes upward through a horizontal bar 541 attached to the upper end, and a handle 551 is attached to the protruding upper end. When you turn the handle 551, Bridge 5
3 moves up and down, thereby causing the short tube 51 to move up and down. Further, a gear 552 is attached to the threaded rod 55 , and a needle 554 rotates on a scale plate 555 by another gear 553 that meshes with the gear 552 to indicate the height of the short tube 51 .

In FIG. 6, a bridge 53 and a wing piece 56 are attached to the upper end of the short tube 51, and a guide rod 54 is inserted into a notch provided in the wing piece 56. A threaded rod 55 is inserted into a threaded hole provided in the bridge 53, and the threaded rod 55 passes through a horizontal bar 541 attached to the upper end of the guide rod 54 and protrudes upward, and the upper end of the threaded rod 55 extends upwardly. , can be rotated using a box spanner. When the threaded rod 55 is rotated, the bridge 53 moves up and down, thereby causing the short tube 51 to move up and down. Further, a gear 552 is attached to the threaded rod 55 , and a needle 554 rotates on a scale plate 555 by another gear 553 that meshes with the gear 552 to indicate the height of the short tube 51 . It is desirable that the scale on the scale plate is one that magnifies the movement of the short tube by about 10 times. Between the short pipe 51 and the vertical pipe 5,
Grand packing 513 and packing presser 514
It is made airtight using Note that a grating 33 is fitted to the upper end of the discharge groove 3. Grating 33 is made of iron or reinforced synthetic resin.

Furthermore, short pipes 51 attached to the upper ends of many vertical pipes
Instead of adjusting the heights individually, they may all be adjusted at the same time. For this purpose, for example, a long horizontal bar can be rotated by a motor, and the rotation of the horizontal bar can be transmitted by a bevel gear to the threaded rod 55 that moves each short tube.

According to this invention, in a multilayer sedimentation tank, a horizontal pipe is provided in the lower chamber, a large number of small holes are bored in the wall of the horizontal pipe, and the horizontal pipe is placed above the center of the lower chamber in the depth direction. This position allows the supernatant liquid produced in the lower chamber to enter the horizontal tube. Furthermore, since the vertical pipe is connected to the horizontal pipe and the vertical pipe is passed through the wall of the drain groove so that its upper end projects into the groove, water that has entered the horizontal pipe can overflow into the drain groove. Therefore, the supernatant water in the lower chamber can flow out into the drain groove. In the first invention, the upper end of the vertical pipe is opened at approximately the same height as the upper edge overflow part of the overflow weir attached to the upper chamber, and a large number of such vertical pipes are erected in the discharge groove. Therefore, the outflow condition of water in the lower chamber can be set to almost the same conditions as the outflow of water in the upper chamber.

In addition, in the second invention, the upper end of the short pipe that slides vertically on the upper end of the vertical pipe can be moved above or below the height of the upper edge overflow part of the overflow weir, so that The amount of water flowing out can be easily adjusted. As mentioned above, the multilayer sedimentation basin according to the present invention has excellent advantages.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of the multilayer sedimentation tank of the present invention, FIG. 2 is a partially cutaway sectional view showing another example of the multilayer sedimentation tank of the invention, and FIGS. FIG. 5 is a sectional view showing an example of the short tube moving mechanism according to the present invention, and FIG. 6 is a partially cutaway perspective view showing another example of the short tube moving mechanism according to the present invention. In each figure, 1 is a pond, 2 is an outflow gutter, 3 is a discharge groove, 4 is a horizontal pipe, 5 is a vertical pipe, 6 is a motor, 11 is a floor plate, 12 is an upper chamber, 13 is a lower chamber, and 14 is an open part. ,
15 and 21 are overflow weirs, 31 is concrete,
32 is a sealing material, 33 is a grating, 41 is a small hole, 51 is a short pipe, 52 is a collar, 53 is a bridge, 5
4 is a guide rod, 55 is a threaded rod, 56 is a wing piece, 51
1 is an O-ring, 512 is a U-packet, 513 is a ground seal, 514 is a seal holder, 54
1 is the horizontal bar, 551 is the handle, 552 and 55
3 is a gear, 554 is a needle, 555 is a scale plate, and 61 is a speed reducer.

Claims (1)

[Scope of Claims] 1. A floor plate is provided midway in the depth direction of the pond to divide the pond into an upper chamber and a lower chamber, an outflow gutter is provided in the upper chamber, and an overflow weir is attached to the side edge of the outflow gutter. In a multi-layer sedimentation basin in which one end of the outflow gutter is connected to the discharge groove, a number of horizontal pipes are installed in the lower chamber, and the horizontal pipes are located above the center of the lower chamber in the depth direction, and the horizontal pipes are connected to the pipe wall of the horizontal pipe. Drill a number of small holes, connect the vertical pipe to the horizontal pipe, pass the vertical pipe through the wall of the drainage ditch, and make the upper end protrude into the ditch, so that the upper end is approximately equal to the upper edge overflow part of the overflow weir. A multi-layer sedimentation tank that opens at a certain height and has many vertical pipes like this installed inside a drainage ditch. 2. Install a floor plate midway in the depth direction of the pond to divide the inside of the pond into an upper chamber and a lower chamber, install an outflow gutter in the upper chamber, attach an overflow weir to the side edge of the outflow gutter, and install one end of the outflow gutter. In a multilayer sedimentation tank connected to a discharge channel, a large number of horizontal pipes are installed in the lower chamber, the horizontal pipes are positioned above the center of the lower chamber in the depth direction, and many small holes are bored in the wall of the horizontal pipes. Connect the vertical pipe to the horizontal pipe, pass the vertical pipe through the wall of the drainage ditch, make the upper end protrude into the ditch, attach a short pipe that slides up and down to the upper end, and connect the upper end of the short pipe to the overflow. A multi-layer settling basin that can be moved above and below the height of the overflow section of the upper edge of the weir.