JP4472829B2 - Sand settling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sand settling device used for washing sand collected from a sand settling basin such as a sewage treatment plant or a pumping station.
[0002]
[Prior art]
The sediment collected from the sedimentation basin such as a sewage treatment plant is attached with organic dirt such as sludge and human excrement. It is necessary to separate organic filth by washing so that secondary pollution such as contamination of the surrounding water by leachate does not occur.
[0003]
As shown in FIG. 4, the conventional sand settling apparatus includes a sand settling inlet 5 for loading the settling sand 4 on the side wall on one end side that is the upstream side, and a downstream side from the inner bottom. The partition wall 3 is provided in the upper position excluding the inner bottom plate in the receiving tank 2 in which the screw conveyor 1 for sedimentation discharge is installed so as to extend obliquely upward to a position extending to the outside of the tank on the other end side. The inside is divided into a primary tank 2a and a secondary tank 2b along the direction of sand discharge by the screw conveyor 1 for discharging sand, and the overflow pipe 8 is communicated with the side wall of the divided secondary tank 2b. An overflow port 9 is configured to be open, and organic waste is removed only by the impact when the sedimentation sand 4 is introduced into the primary tank 2a through the sedimentation inlet 5 and dilution with fresh water as the cleaning water 6 for dilution supplied into the tank. After separating and separating organic waste A simple sand-washing device in which the sand 4 is discharged out of the tank by the sand-sink discharge screw conveyor 1 and collected, or as schematically shown in FIG. A partition gate 11 that is rotated about a vertical axis by driving a motor 10 is arranged in a receiving tank 2 in which 1 is installed, and a primary tank 2a on the sand settling inlet 5 side and a screw conveyor for discharging sand settling are disposed in the receiving tank 2. A rotary blade (pulsator) which is divided into a secondary tank 2b on the first side and is connected to a motor 12 outside the receiving tank 2 and rotated on the inner wall of the primary tank 2a below the sand settling inlet 5 ) 13 is equipped as a washing machine, the overflow tank 9 is provided in the secondary tank 2b, the partition gate 11 is closed, the settling sand 4 is introduced into the primary tank 2a, and separation and diffusion is performed by the rotation of the rotor blades 13. Let them do the cleaning, On the other hand, the waste water 15 used for rinsing in the secondary tank 2b overflows from the overflow port 9 to the overflow pipe 8, and is pumped to the primary tank 2a through the pressure feed pipe 16 by the circulation pump 14, and re-used as diluted washing water. The organic filth is separated from the settling sand 4 so as to be used. Further, after washing in the primary tank 2a, the partition gate 11 is opened, the settling sand 4 is discharged to the secondary tank 2b, and the secondary tank 2b is washed with the washing water 6. In addition, there is a sand settling device that allows further rinsing. In FIG. 4, 7 shows the drive motor of the screw conveyor 1 for sedimentation discharge, and in FIG. 5, 17 shows a drain circulation pipe.
[0004]
[Problems to be solved by the invention]
However, in the case of the sand settling apparatus shown in FIG. 4, since it is simple washing only by dilution with fresh water, it is not possible to effectively separate and remove the organic soil adhering to the settling sand 4 and to remove it. There is a problem that cannot be obtained.
[0005]
On the other hand, in the case of the sand settling device shown in FIG. 5, the organic filth can be effectively separated from the settling sand 4, but there is a problem that a large amount of power is required to create a vigorous water flow by the rotating blades 13. .
[0006]
Therefore, the present invention is intended to enable effective separation and removal of organic dirt adhering to the settling sand without requiring large power.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a sand conveyor for discharging sand settling so that a sand settling inlet is provided on a side wall on one end side and extends obliquely upward to a position extending from the inner bottom to the outside of the tank on the other end side. There washed put grit in the receiving vessel that is installed in the sand washing apparatus that is so as to discharge the sand with grit discharge screw conveyor, the sand inlet installation side within the receiving tank, the grit inlet oblique to the drum of such magnitude and the hollow in and above the sand in the peripheral wall has a porous structure with a slit or hole was set to a size which can not pass through to surround, facing ends of the drum the sand discharge direction arranged in order downwardly, one end of the drum, by rotatably cantilevered on one end side wall of the receiving tank, said Dora the precipitated sand thrown from the sand inlet, through the said drum rotating The other end a structure in which the so that is dropped into the receiving tank in the bottom of the.
[0008]
When the settling sand is put into the rotating drum, the stirring action is given to the settling sand by the rotation of the drum, and the organic dirt is separated and removed from the settling sand by washing with the washing water.
[0009]
Further, since the drum are a porous structure, remaining only sand in the drum, the washing water is supposed to be free to flow through the drum and out, it becomes possible to sufficiently exhibit the dilution effect.
[0010]
Furthermore, the sand settling port is installed on the side wall on one end side, and the sand settling is thrown into the receiving tank on which the screw conveyor for sand settling discharge is installed so as to extend diagonally upward from the inner bottom to the outside of the tank on the other end side. In the sand settling device in which the sand settling is discharged by a screw conveyor for discharging the settling sand, on the side where the settling port is installed in the receiving tank, a hollow shape is formed so as to surround the settling port. In addition, a drum having a slit or a hole set to a size such that the above-mentioned sand sediment cannot pass through the peripheral wall portion and a stirring member attached to the inner peripheral surface portion is slanted so that the end portion of the drum faces the sand sediment discharge direction. The drum is disposed downward, and one end of the drum is rotatably supported by one end side wall of the receiving tank so that the sand settling from the sand settling port passes through the rotating drum. Because are a structure which is adapted to fall into the receiving vessel in the bottom from the other end of the drum, it is possible to increase the stirring action of the sand in the drum.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows an embodiment of the present invention. Like the one shown in FIG. 4, a sand settling inlet 5 is installed on the side wall on one end side which is the upstream side of the receiving tank 2 and from the inner bottom. A sand conveyor for discharging the sedimentation sand 1 is installed so as to extend obliquely upward to a position extending to the outside of the tank at the other end on the downstream side, and is guided to the outside of the tank at a required portion in the center of the receiving tank 2. In the configuration in which the overflow weir 19 connected to the drainage pipe 18 is provided, the sand settling inlet 5 is inserted through the sand settling inlet 5, and the receiving tank of the place where the sand settling inlet 5 is installed. On the inner side surface of the side wall 2A, a guide cylinder 20 having a diameter larger than that of the sand settling pipe 5a and a short guide cylinder 20 is fixed slightly obliquely downward toward the sand settling discharge direction so as to surround the sand settling inlet 5. 20 is set to a smaller diameter than the guide cylinder 20 and the direction of sedimentation discharge. One end of a hollow drum 21 having a required length that is disposed obliquely downward is supported in a cantilever manner via a bearing 22 so that the sand sediment 4 is positioned in the drum 21 through the sand sediment introduction pipe 5a. The chain 26 is looped endlessly between a sprocket 23 attached to the outer periphery of the drum 21 and a sprocket 25 attached to the shaft of a motor 24 fixedly installed outside the tank. Is transmitted to the sprocket 23 from the sprocket 25 via the chain 26 and the drum 21 is rotated, so that the sand 21 is agitated in the presence of the cleaning water 6 and dropped into the drum 21 due to its own weight. Let the power be given.
[0013]
As shown in FIG. 2 (a), the drum 21 has a porous structure in which a number of strip-shaped slits 27 are provided in the peripheral wall portion in parallel (or in the circumferential direction) with the rotation axis, or as shown in FIG. 2 (b). The porous structure has a large number of small holes 28 in the peripheral wall portion. The band-like slits 27 and the small holes 28 are set to a size that does not allow the sedimentation sand 4 to pass through.
[0014]
In the state where the drum 21 is rotated at the required speed by driving the motor 24, when the sand settling 4 is put into the drum 21 through the sand settling pipe 5a, the sand settling 4 is agitated (disturbed) by the rotating action of the drum 21, and the other is caused by its weight It moves to the end side and is dropped from the end of the drum 21, and during this time, the organic filth adhering to the sedimentation sand 4 is separated by washing with the washing water 6 passing through the drum 21 and stirring action. become. At this time, since the rotating drum 21 is provided with strip-shaped slits 27 and small holes 28 as shown in FIGS. 2A and 2B, the cleaning water 6 and the organic waste are formed in these slits 27 and small holes 28. You can pass through freely. Therefore, the washing water 6 and the separated organic filth do not stay in the drum 21, and the dilution effect by the washing water 6 in the receiving tank 2 can be sufficiently received. The separated sand settling 4 falls from the end of the drum 21 and is discharged out of the tank by the sand settling screw conveyor 1. In addition, since the organic waste separated from the settling sand 4 floats, the organic waste sequentially passes over the overflow weir 19 and is discharged through the discharge pipe 18.
[0015]
In the above description, the power necessary for the rotation of the drum 21 is only the sliding resistance of the bearing 22 and the potential energy that moves (lifts) the weight of the sedimentation sand 4 introduced into the drum 21, and it is necessary to create a water flow. Therefore, it is very small compared with a rotor blade that needs to generate a violent water flow as shown in FIG.
[0016]
In addition, water flows into the drum 21 together with the settling sand 4, but if this inflow water is insufficient or if the dirt is severe, for example, the washing water is externally supplied as shown in FIGS. 4 and 5. You may make it introduce | transduce the fresh water as 6. Thereby, the dilution effect can further be heightened.
[0017]
Next, FIGS. 3 (a) and 3 (b) show other embodiments of the present invention. That is, in the same configuration as that of the above-described embodiment, a plate-like stirring member 29 is attached in parallel with the rotational axis as shown in FIG. As shown in FIG. 3 (B), a round bar-like stirring member 30 is attached in parallel to the rotation axis.
[0018]
When the stirring member 29 as shown in FIG. 3 (a) and the stirring member 30 as shown in FIG. 3 (b) are attached to the inner peripheral portion of the drum 21, the stirring effect of the sedimentation sand 4 by the rotation of the drum 21 can be enhanced. Therefore, the separation effect of organic waste can be further improved.
[0019]
Note that the present invention is not limited to the above embodiment, and the structure of the drum 21 can be appropriately selected according to the properties of the sand settling object 4 to be cleaned, that is, the slits 27 and the small holes 28 of the drum 21. Of course, the size and number, the size and number of the agitating members 29 and 30, or the presence or absence thereof, can be arbitrarily selected, and various changes can be made without departing from the scope of the present invention.
[0020]
【The invention's effect】
As described above, according to the sand settling apparatus of the present invention, the sand settling outlet is installed on the side wall on one end side, and the sand settling discharge is performed so as to extend obliquely upward from the inner bottom portion to the outside of the tank on the other end side. use screw conveyor is washed by introducing a grit to the receiving vessel that is installed in the sand washing apparatus that is so as to discharge the sand with grit discharge screw conveyor, the sand inlet placed side within the receiving tank, the sand the drum was a porous structure having a slit or hole and the above sand settling in the peripheral wall portion is set to a size that can not be passed in the hollow sized to surround the inlet, toward the end of the drum to the sand discharge direction disposed obliquely Me downwardly so, one end of the drum, by rotatably cantilevered on one end side wall of the receiving vessel, the precipitated sand thrown from the sand inlet, rotating the drum Through Since a structure in which the so that is dropped into the receiving vessel in the bottom from the other end of the drum Te, a grit that is introduced into the drum by the stirring action by the rotation of the washing drum with water, adhere to grit with organic dirt are able to efficiently separate power required to rotate since it is not necessary to make a tough water flow by the rotation of the drum is advantageous well be very small, also the drum and porous structure As a result , the sand can be left in the drum and the wash water can be freely circulated, so that the effect of dilution by the wash water can be fully exerted, and a sand sink inlet is provided on the side wall on one end side. The sand sink is loaded into the receiving tank where the sand sediment discharge screw conveyor is installed so as to extend obliquely upward from the inner bottom to the outside of the tank on the other end side. In the sand settling device that is to be discharged by a bayer, the sand settling port in the receiving tank has a hollow shape that surrounds the settling port, and the sand cannot pass through the peripheral wall. A drum having a porous structure having slits or holes set to the above and having a stirring member attached to the inner peripheral surface portion is disposed obliquely downward so that the end portion of the drum is directed in the direction of sand sediment discharge, and one end portion of the drum Is supported in a cantilevered manner on the side wall on one end of the receiving tank, and the sand settling from the sand settling port is dropped from the other end of the drum to the bottom of the receiving tank through the rotating drum. By adopting such a configuration, it is possible to further enhance the stirring effect of the sedimentation in the drum, and to exhibit an excellent effect that the organic filth can be separated more effectively.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of a sand washing apparatus according to the present invention.
2 shows an example of a drum used in the apparatus of FIG. 1. FIG. 2A is a perspective view showing a structural example provided with a belt-like slit on the peripheral wall, and FIG. 2B shows a structural example provided with a small hole in the peripheral wall. FIG.
3 shows another example of the drum used in the apparatus of FIG. 1. (A) is a front view showing an example in which a plate-like stirring member is provided on the inner peripheral surface portion, and (B) is on the inner peripheral surface portion. It is a front view which shows the example which provided the round bar-shaped stirring member.
FIG. 4 is a schematic side view showing an example of a conventional sand sediment washing apparatus.
FIG. 5 is a schematic side view showing another example of a conventional sand settling device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Screw conveyor for sand settling 2 Receiving tank 2A Side wall 4 Sand settling 5 Sand settling inlet 5a Sand settling pipe 21 Drum 27 Belt-like slit 28 Small holes 29, 30 Stirring member

Claims (2)

Settling sand into a receiving tank where a sand settling inlet is installed on the side wall on one end and a screw conveyor for discharging sand settling is installed so as to extend diagonally upward from the inner bottom to the outside of the tank on the other end. washed, the sand cleaning device that is to be discharged by the sand discharge screw conveyor to grit, the grit inlet placed side within the receiving tank, and a peripheral wall portion in a hollow shape with a size to surround the grit inlet in the drum that the porous structure having the set slits or holes sized to the sand can not pass, and an end portion of the drum is disposed obliquely Me downwardly facing to the sand discharge direction, one end of the drum and by rotatably cantilevered on one end side wall of the receiving tank, to drop the precipitated sand thrown from the sand inlet, the receiving tank bottom inside from the other end of the drum through the drum to rotate Ruyo Grit cleaning apparatus characterized by having a structure in which the. Settling sand into a receiving tank where a sand settling inlet is installed on the side wall on one end and a screw conveyor for discharging sand settling is installed so as to extend diagonally upward from the inner bottom to the outside of the tank on the other end. In the sand settling device for washing and discharging the sand settling with a screw conveyor for sand settling, the sand settling port in the receiving tank is provided with a hollow shape that surrounds the settling port. A drum having a porous structure having slits or holes set to a size such that the sand settling cannot pass through the peripheral wall portion and a stirring member attached to the inner peripheral surface portion is tilted downward so that the end of the drum faces the sand discharge direction. The drum is supported by one end of the drum so as to be rotatable at one end side wall of the receiving tank, and the sand settling from the sand settling port is passed through the rotating drum. Grit cleaning apparatus characterized by having the structure so as to fall into the receiving vessel in the bottom from the other end of the arm.

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