JP2001029704A - Precipitate-transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precipitate transfer device of a good efficiency wherein the costs of power and water can be extremely reduced. SOLUTION: A suction opening 11a open to an under bottom part of a wastewater treatment pond is provided to one end, and a discharge opening 12a dipped in water of the wastewater treatment pond is provided to the other end. A transfer pipe line 13 wherein a gravity classifier 14 for separating a precipitate in the wastewater into sieve residue and sedimentation sand and removing them and a circulation pump 15 are successively interposed from the suction opening side 11a to the discharge opening side, and a degassing means for degassing in the gravity classifier 14 and in the transfer pipe line 13 are provided midway. The degassing means is started, and the insides of the gravity classifier 14 and the transfer pipe line 13 are degassed. Thereby, a syphon is formed, and the inside of the gravity classifier 14 and the inside of the transfer pipe line 13 are filled with wastewater. Thereafter, the circulation pump 15 is started, and the precipitate is transferred together with the wastewater from the suction opening 11a to be gravity classifier 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sediment transfer apparatus for transferring and removing sediment deposited in a treatment basin such as a sand basin or a sedimentation basin of a sewage treatment facility.

[0002]

2. Description of the Related Art As a means for transferring sediment in a sewage treatment facility, a mechanical transfer means is used instead of a mechanical transfer means.
There has been proposed a jet pump disclosed in Japanese Patent Application Publication No. 999, and an air-mixed jet pump in which cavitation is prevented by mixing air into the jet pump. These sediment transfer means are relatively limited in transfer route due to pipe transfer, do not emit bad odor unlike mechanical transfer means, are good in landscape, and preserve the work environment of managers. It has the feature that it can be done.

Further, a running water trough provided with an injection nozzle as a gutter transfer means, such as that disclosed in Japanese Patent Application Laid-Open No. 4-66104, has a simple structure and is suitable for transferring a small amount of sediment. Also known as

In the sediment transfer device, a sand settling machine or a sieve residue unloading machine is provided in a washing tank having an open upper edge as a device for classifying and washing sand and a sediment, and mainly after mechanical stirring. Some carry them out and remove them.

[0005]

Among the above-mentioned conventional sediment transfer means, the former converts energy between fluids by using high-pressure water, but has a very low energy conversion efficiency and a large energy conversion efficiency. There is a disadvantage that power costs are required. In addition, since a large amount of water is required for jet water,
In a pump station or the like in which treated water cannot be obtained, the water for the jet pump must rely on rainwater or tap water, which also increases the water cost.

Further, the latter gutter transfer means transfers a large amount of sediment for maintenance because the large amount of sediment flowing into the gutter at a time during heavy rain may block the gutter and become unusable. There is a need for a sediment transfer device that can do this.

Further, the conventional classification / washing apparatus has a disadvantage that it is large and complicated.

[0008] In view of the above-mentioned circumstances, a first object of the present invention is to provide an efficient sediment transfer device capable of remarkably reducing power costs and water costs.

A second object of the present invention is to provide a sediment transfer apparatus in which the amount of transferred sediment is greatly increased.

A third object of the present invention is to provide a compact transfer device as a precipitate transfer device without mixing mechanical means or fluid means in one system.
Another object of the present invention is to reduce the amount of water used in the washing step.

[0011]

According to a first aspect of the present invention, there is provided a first sediment transfer device having a suction port which opens at the bottom of the submerged water of a sewage treatment tank at one end, and the other end. A gravity classifier that separates and removes sediment in sewage into sieve residue and sediment, and a circulation pump is provided from the suction port side. A transfer line interposed sequentially toward the discharge port side, and deaeration means for deaeration in the gravity classifier and the transfer line. A siphon is formed by degassing the inside of the classifier and the inside of the transfer line, and after filling the inside of the gravity classifier and the inside of the transfer line with sewage, the circulating pump is started and the suction port is started. And transferring the sediment together with the wastewater to the gravity classifier. It is.

It is preferable to provide a vacuum pump as the degassing means. However, when a self-supplying water pump is used as the circulating pump, the circulating pump also serves as the degassing means without providing a separate degassing means. May be.

Preferably, the gravity classifier has a structure as described in claim 12.
In that case, it is preferable to connect a deaeration pipe to the top wall covering the upper part of the cylindrical peripheral wall in order to facilitate deaeration of the gravity classifier.

Further, it is preferable that a second sediment transfer passage for transferring the sediment in the pond toward the suction port is provided at the bottom of the water in the sewage treatment pond.

According to a second aspect of the present invention, there is provided a second sediment transfer apparatus, comprising: a long gutter having an open upper edge; an upper sediment transfer chamber; A plurality of guide plates arranged in the gutter along the longitudinal direction thereof, and a pressure water injection port provided at an upstream end of the header chamber. In the form in which the edge portions adjacent to each other in the longitudinal direction of the gutter overlap each other such that the guide plate on the downstream side faces downward, and the upper and lower edge portions of the guide plate in the overlap portion The pressure water injection port for the sediment transfer chamber is formed between the sections, and the pressure water injection port is arranged in a stepwise manner. From the outlet, pressurized water is directed downstream of the gutter. By jetting Te, the precipitate transfer chamber precipitate is characterized in that the transporting to the downstream side of the gutter.

[0016] The second precipitate transfer device described in claim 8 can be combined with the first precipitate transfer device described in claim 1. In that case, the first
A suction port at one end of a transfer line of the precipitate transfer device is provided at a downstream end of the gutter of the second precipitate transfer device, and an outlet at the other end of the transfer line of the first precipitate transfer device is provided. Is preferably provided at the pressure water injection port of the second precipitate transfer device.

It is preferable that the plurality of guide plates have a length in the longitudinal direction of the gutter shortened toward the downstream side of the gutter.

Further, it is preferable that the direction of the guide plate disposed at the downstream end of the gutter is changed.

According to the present invention, a gravity classifier for separating and removing sediment into sieve residue and sediment according to the present invention is provided with a sediment outlet at the lower end by squeezing the lower part in a conical shape. A cylindrical peripheral wall and a top wall covering the upper part of the peripheral wall, and a sedimentation reservoir communicating with the sedimentation outlet is formed in an inner lower layer of the outer shell, thereby forming sewage and sewage in the sewage. An arc-shaped screen chamber formed by being surrounded by a screen that allows the passage of sedimentation, a part of the cylindrical peripheral wall, and upper and lower partition plates is adjacent to the screen on a side opposite to the screen chamber side. And a hollow portion communicating with the sediment reservoir below and provided in the inner upper layer of the outer shell, and the screen extends along the cylindrical peripheral wall at a substantially intermediate portion between the cylindrical peripheral wall and a central axis. Has a flat shape curved in an arc That consists a plurality of screen bars are stacked at predetermined intervals from each other in the vertical direction,
An inflow pipe of sewage containing sediment is connected to one end of the screen chamber, the sieve residue blocked by the screen is stored, and the sieve residue having a sieve residue outlet at a lower end is provided in the screen chamber. Is connected to the other end of the
An outlet pipe of the sewage from which the precipitate has been removed is connected, and the inlet pipe, the outlet pipe, and the sieve residue reservoir extend in a tangential direction of the cylindrical peripheral wall. .

It is preferable that a washing pipe is provided below the conical outer shell.

Further, it is preferable that a rotary feeder is disposed at the above-mentioned sand settling outlet, and this rotary feeder communicates with a sand settling feed pipe.

[0022]

In the first sediment transfer apparatus of the present invention, the suction pipe and the discharge port of the transfer pipe are opened in the water of the sewage treatment pond, and all of the transfer pipe including the gravity classifier is used. A siphon is formed by degassing, and sewage is circulated in a treatment pond by a circulation pump. During the sewage circulation, the precipitate is transferred from the suction port to a gravity classifier at a flow rate of the sewage to be removed. Things.

That is, in the first sediment transfer apparatus of the present invention, since the siphon is used, the energy loss is only the friction loss of the sewage and the lift loss of the sediment, and is caused by the pumping of the sewage itself. Since no energy loss occurs and the sediment is transferred at the flow rate of the wastewater, the power cost and the water cost can be significantly reduced.

In addition, since a sediment classifier is disposed on the suction side of the circulation pump to temporarily store the sediment in the classifier, sieve residue and sediment do not pass through the pump. It is possible to prevent inconveniences such as sieving residue entangled in the impeller and abnormal wear of the pump due to sedimentation. Therefore, in the impeller of the circulation pump,
Efficiency can be remarkably improved compared to jet pumps by adopting an impeller shape that gives priority to efficiency, or by pumping using a transfer pump (a transfer pump can also use an efficient impeller shape as well). There is also the advantage of doing so.

By the way, for example, in the case of transferring a sediment to slurry, the most energy-consuming and operationally difficult operation is to accelerate the stationary sediment to float and accelerate to a constant velocity. Are known.

According to the second precipitate transfer device of the present invention,
A plurality of guide plates are provided for partitioning the gutter into an upper sediment transfer chamber and a lower header room, and the plurality of guide plates are arranged such that edges adjacent to each other in the longitudinal direction of the gutter are located on the downstream side. In a mode in which the guide plates are overlapped so as to be downward, and a pressure water jet port for the sediment transfer chamber is formed between the upper and lower guide plate edges in the overlap portion, and sequentially in a stepwise manner. Since the sediment is disposed, the sediment to be transferred is dropped by gravity at the step between the guide plates, and temporarily floats in the sewage. In this state, the sediment can be levitated and transferred by ejecting the pressure water from the pressure water ejection port between the upper and lower guide plate edges to the downstream side of the gutter.
Therefore, it is possible to efficiently transfer the precipitate to a distant place with a small amount of energy, and it is possible to transfer a large amount of the precipitate even if the pressurized water is ejected from the gap at a relatively low speed.

This means that the discharge port at the other end of the degassable transfer pipe in the first sediment transfer device of the present invention is used as a pressure water injection port in the second sediment transfer device of the present invention. A second sediment transfer device, wherein the second sediment transfer device is combined with a first sediment transfer device operated by the action of a siphon. , The sediment is successively levitated and transferred toward the suction port at one end of the degassable transfer line in the first precipitate transfer device, whereby the synergistic effect of the effects of both devices is provided. Thus, a very efficient precipitate transfer device can be obtained.

In the second sediment transfer device,
The amount of sediment transported increases as approaching the end of the gutter, but by shortening the length of the plurality of guide plates in the longitudinal direction toward the downstream of the gutter, the interval between the pressure water jets is reduced. Can be reduced stepwise, which allows for more efficient sediment transport.

Further, for example, when the first and second sediment transporting devices are combined, the direction of the guide plate disposed at the downstream end of the gutter in the second sediment transporting device is changed to the direction of the first sediment transporting device. By changing so as to face the suction port, the precipitate can be efficiently sucked into the first precipitate transfer device.

Further, in the gravity classifier according to the present invention, since the gravity classifier is configured as a closed type, the sediment can be transferred by a siphon, and a screen chamber is provided in the upper part of the classifier and a sand trap is provided in the lower part. Since they were separately disposed, classification by the difference in sedimentation speed between the sedimentation and the sieve residue could be made more reliable.

Further, in the gravity classifier according to the present invention, since the screen chamber is curved in an arc shape and the sieve residue is extended at the other end of the screen chamber in the tangential direction of the cylindrical peripheral wall, the sewage is reduced. Of the precipitate contained,
The sieve residue having a specific gravity of about 1 which is blocked by the screen disposed in the upper layer and separated is easy to float, and is subjected to the dynamic pressure and centrifugal effect of the fluid (sewage) flowing from the inflow port to the front of the screen. The sediment gradually moves along the sifter to the sieve sediment and is temporarily stored in the sieve sediment. On the other hand, the sediment with a specific gravity of around 2.6 passes through the screen and easily sediments by gravity into the sediment from the hollow part. The sediment in the sewage is efficiently separated from the sewage, so that only the sewage flows out from the outlet communicating with the suction port of the circulation pump.

When clear washing water is injected from a washing pipe provided in the lower part in a state where the inlet and the outlet are closed, the sediment deposited and accumulated in the sediment basin floats in the water. Agitated, sludge and the like still adhering to the settled sand are separated, passed through the screen and discharged from the sieve residue outlet together with the sieve residue, and the wastewater in the sedimentation reservoir is replaced with clear water, so there is little The first-stage washing of the sediment is performed by using the clear water.

Further, in the case where a rotary feeder is provided at a sedimentation outlet provided at the bottom of the gravity classifier,
When transferring the sediment in the sedimentation basin through the sedimentation feed pipe,
By changing the rotation speed of the rotary feeder,
It is possible to transfer the sediment in the sedimentation pumping pipe at a slurry concentration as high as possible without clogging the pumping pipe, and it is possible to perform the sand transfer very efficiently. Then, the still-dirt settling sand is transferred to the subsequent classifier while colliding with a wall such as an elbow in the pressure feeding pipe, and the attached matter is further separated and washed.

[0034]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing the entire configuration of an embodiment of the precipitate transfer device according to the present invention.

The first sediment transfer device 10 has one end connected to a suction pipe 11 having a suction port 11a opened at the bottom of the sand basin 1 underwater, and a discharge pipe immersed in the water of the sand basin 1 at the other end. A transfer line 13 is provided to which a discharge tube 12 having an outlet 12a is connected. In the middle of the transfer line 13, a gravity classifier 1 for separating and removing sediment in sewage into sieve residue and sediment.
4 and a circulation pump 15 are sequentially interposed from the suction port 11a side to the discharge port 12a side, and the transfer line 13 is connected between the suction pipe 11 and the inflow port 14a of the gravity classifier 14. Pipe section 13a and outlet 14b of gravity classifier 14
1 connected to the suction port of the circulation pump 15
3b and a conduit 13c connected between the discharge port of the circulation pump 15 and the discharge pipe 12.

At the top of the gravity classifier 14, there is provided a deaeration port 14 c to which one end of a deaeration pipe 17 provided with a vacuum pump 16 is connected, and the other end of the deaeration pipe 17 is opened in the sand basin 1. are doing.

Since the decaying organic matter adheres to the precipitate to generate gas, the circulating pump 15 is provided with self-priming water having a good gas-liquid suction efficiency so that the gas cannot be sucked even if gas is generated. Preferably, a pump is used.

The gravity classifier 14 has a configuration as shown in FIG. 3 which is a longitudinal sectional view of FIG. 2 and a transverse sectional view taken along the line AA of FIG. It has an outer shell 18 consisting of a cylindrical peripheral wall 18a having a sedimentation outlet 14d at the lower end, and a top wall 18b which connects the deaeration pipe 17 and covers the upper part of the peripheral wall 18a. A sedimentation reservoir 19 communicating with the sedimentation outlet 14d is formed.

A screen 20 for permitting the passage of sewage and the sediment in the sewage, and preventing and removing the passage of the sieve residue is provided in the upper portion of the outer shell 18. As is apparent from FIG. 3, the screen 20 has a width having a plane shape curved in an arc shape along the cylindrical peripheral wall 18a at a substantially intermediate portion between the cylindrical peripheral wall 18a and the central axis O (FIG. 3). A plurality of screen bars 21 made of a narrow thin plate are vertically stacked at predetermined intervals, and both ends of the screen bar 21 are linearly extended in a tangential direction of the cylindrical peripheral wall 18a. A screen chamber 22 having an arc-shaped planar shape is formed in the inner upper layer of the outer shell 18 so as to reach the position of the cylindrical peripheral wall 18a.

The screen room 22 is provided with a screen 20.
And upper and lower partitioning plates 2 which are partitioned on both sides by a cylindrical peripheral wall 18a and are fixed substantially horizontally to the cylindrical peripheral wall 18a.
The upper and lower parts are partitioned by 3,24. A plurality of screen bars 21 are attached to two columns 25, 25 fixed between both ends of the partition plates 23, 24 by an intermediate cylinder 26.
To form a screen 20. Further, both ends of the screen 20 are connected to the cylindrical peripheral wall 18.
are supported by fixtures 27, 27 extending from a. A plurality of small holes 28 for preventing air lock are formed in the upper and lower partition plates 23 and 24, and a plurality of air holes 28 provided on the bottom surface of the partition plate 24 and between the cylindrical peripheral wall 18a. Reinforcing ribs 29 are connected.

Screen chamber 22 having an arc-shaped plane shape
Are opened by openings formed in the cylindrical peripheral wall 18a. An inflow pipe 31 forming an inflow port 14a of sewage containing sediment is connected to one end of the screen chamber 22, and an inflow pipe is provided. A valve V2 is attached to the entrance of the valve 31 and forms an inflow port 14a of the gravity classifier 14. The other end of the screen chamber 22 is connected to a sieve residue reservoir 32 formed by extensions of the upper and lower partition plates 23 and 24 and a plurality of other side plates. Is provided as a sieve residue outlet 14e.

The area adjacent to the screen chamber 22 on the side opposite to the screen chamber 22 side with respect to the screen 20 forms a hollow portion 30 communicating with the lower sand trap 19. Outflow 1 of sewage from which sediments have been removed by gravity classifier 14
An outflow pipe 33 forming 4b is connected substantially parallel to the inflow pipe 31 and at substantially the same height. The outlet of the outflow pipe 33 is provided with a valve V4. The inflow pipe 31, the outflow pipe 33, and the sieve residue 32 extend in a tangential direction of the cylindrical peripheral wall 18a, and as is apparent from FIG. The extending directions are substantially perpendicular to each other.

In this embodiment, the sieve residue is removed only by the screen 20. However, depending on the properties of the sieve residue, FIG.
Install the rake so that the outer trajectory is shown at 6,
The sieve residue may be mechanically scraped off.

On the other hand, as shown in FIG. 2, a rotary feeder 35 is disposed at a sand settling outlet 14d at the lower end of the outer shell narrowed conically of the gravity classifier 14, and the rotary feeder 35 is provided with a sand settling pipe. 36. A valve V9 is provided on the upstream side of the rotary feeder 35, and a valve V10 is provided on the downstream side.

A plurality of washing tubes 3 having a large number of small holes 37a are provided in the lower part of the outer shell of the gravity classifier 14 which is narrowed in a conical shape.
7 are provided. As shown in FIG. 1, cleaning water 39 stored in a cleaning water tank 38 is supplied to the cleaning pipe 37 through conduits 41 and 42 by a cleaning pump 40, and the cleaning water 39 is supplied by a transfer pump 43 through lines 41 and 44. Ball tap 4 in washing water tank 38
5 are provided.

Here, the valves V1 to V12 (the configuration is omitted) provided in each part of the first sediment transfer apparatus will be described collectively. In the transfer pipe 13, the suction pipe 11 having the suction port 11a is provided. Is provided with a valve V1, and an inlet pipe 31 provided with an inlet 14a of the gravity classifier 14 has a valve V1
2, a valve V3 is provided in the deaeration port 14c, and a valve V4 is provided in the outflow pipe 31 provided with the outflow port 14b. The discharge pipe 12 having the discharge port 12a of the transfer pipe 13 is provided with a valve V5, the cleaning water outlet of the cleaning water tank 38 is provided with a valve V6, and the cleaning pipe 37 is provided with a valve V7. I have. Further, a valve V8 is provided at the sieve residue outlet 14e, a valve V9 is provided upstream of the rotary feeder 35, and a valve V10 is provided downstream thereof. Further, a valve V11 is provided at a cleaning water supply port of the sedimentation pressure feeding pipe 36, and a valve V12 is provided at a cleaning water inlet of the cleaning water tank 38.

Next, a second sediment transfer device 50 disposed in the sand basin 1 is shown in FIGS. 1 and 4 to 7, and FIG. 4 schematically shows the entire structure. 5 is a side view of the gutter 51 viewed from the downstream end side, FIG. 6 is an enlarged cross-sectional view of the vicinity of the downstream end of the gutter 51, and FIG. 7 is a cross-sectional view taken along line BB of FIG.

The second sediment transfer device has a long gutter 51 installed on the bottom of the sand basin 1. This gutter 5
1 is opened at the upper edge, and a header chamber 5 described later is provided at the upstream end.
4 is provided with a pressure water injection port 51a, the sewage discharge port 12a of the first sediment transfer device 10 described above is opened here, and the downstream end of the gutter 51 is connected to the first sediment transfer device 10a.
Is connected to the suction port 11a. The gutter 51 includes a plurality of guide plates 52 arranged along the longitudinal direction of the gutter 51, and the gutter 51 is divided into an upper sediment transfer chamber 53 and a lower header chamber 54 by the guide plates 52. It is partitioned.

As is apparent from FIGS. 6 and 7, the main part of the gutter 51 is a bottom plate 51b and two side plates 51c, 51c.
The inclined precipitation guide plate 51d is integrally connected to the upper part of each side plate 51c. Gutter 51
The downstream end has a deeper depth, and a blow-up prevention plate 56 whose upper part is inclined toward the upstream side of the gutter 51 is fixed to the downstream end of the blow-up prevention plate 56. 1
The flapper port 57 attached to 1a is open. The blow-up prevention plate 56 has a function of colliding the transferred fluid and the sediment with the transferred fluid and the sediment, thereby guiding the transferred fluid and the sediment downward, thereby preventing the blow-up.

The plurality of guide plates 52 are formed in such a manner that edges adjacent to each other in the longitudinal direction of the gutter 51 are overlapped with each other such that the guide plate 52 on the downstream side faces downward. Upper and lower guide plates 5
The pressure water jets 55 for the sediment transfer chamber 54 are formed between the two edge portions, and are sequentially arranged in steps.
In the present embodiment, the pressure water jet 55 is formed by the gap between the edge portions of the upper and lower guide plates 52 in the overlap portion, whereby the pressure water jet 55 is formed over the entire width of the gutter 51. Is formed, but the pressure water jet port 55 may be formed by a plurality of holes. The expansion and contraction angle of the pressure water is preferably about 9 °, but in the present embodiment, as is apparent from FIG. 6, the downstream end of the guide plate 52 is folded downward to form a folded portion 52a, The contraction flow from the header chamber 54 is formed to be about 9 °,
After the pressure water jet port 55, the pressure water is jetted as a free divergence.

The length of the plurality of guide plates 52 in the longitudinal direction of the gutters 51 becomes shorter toward the downstream side of the gutters 51, and is further arranged at the downstream end of the gutters 51. The several guide plates 59 are arranged at different inclination angles so as to gradually face the suction port 11a of the first precipitate transfer device 10. End guide plate 60
Is preferably extended to the inside along the inner edge of the trumpet opening 57. And the side plates 51c of the gutter 51, 51c
Is preferably narrowed to the size of the horn 57.

Although the guide plate 52 is of a fixed type in the present embodiment, it may be of a movable type so that the size of the pressure water jet 55 can be varied. Further, it is preferable to provide a pressure water jet port between the guide plate 52 and the side plate 51c.

As is apparent from FIG. 5, two gutters 51 are provided side by side in this embodiment, but the second sediment transfer device 50 and the gravity classifier 14 are It is sufficient to provide a required number and combine them in consideration of the size and the like.

Next, the operation of the sediment transfer device according to the present embodiment will be described.

(1) First-stage transfer operation of the precipitate by ordinary siphon formation: valves V1, of the first precipitate transfer device
Open V2, V3, V4, V5 and V6, V7, V9, V
10, with the V11 closed, the vacuum pump 16 is started to evacuate the inside of the gravity classifier 14 and the inside of the transfer line 13,
A siphon is formed inside the gravity classifier 14 and the transfer line 1
3 is filled with sewage, and the valve V3 is closed.

Next, when the circulation pump 15 is started, pressurized water is injected from the discharge port 12a into the header chamber 54 of the second precipitate transfer device 50 via the pressure water injection port 51a,
As a result, pressure water spouts from the pressure water spout 55 between the guide plates 52 toward the downstream side of the gutter 51, and the guide plate 52
The sediment deposited on the top reaches the downstream end of the gutter 51 along the transfer chamber 53, is sucked up together with the sewage from the suction pipe 11, and reaches the gravity classifier 14.

In the gravity classifier 14, the screen room 2
2 is curved in an arc, and the sieve residue 32 is
By extending in the tangential direction of the cylindrical peripheral wall 18a at the other end of 2, among the sediments contained in the sewage,
The sieve residue having a specific gravity of about 1 which is blocked by the screen 20 and separated is gradually accumulated along the front surface of the screen 20 by the dynamic pressure and the centrifugal effect of the fluid (sewage) flowing from the inlet 14a. The sediment moves toward 32 and is temporarily stored in the sieve residue reservoir 32, while the sediment passes through the screen 20 and is separated by gravity from the hollow portion 30 into the sediment reservoir 19.

The sewage from which the sediment has been separated in this way is supplied to the circulation pump 15 through the outlet 14b of the gravity classifier 14.
And then pressurized by the pump 15 and injected from the outlet 12a into the header chamber 54 via the pressurized water inlet 51a of the second precipitate transfer device 50, and the above operation is continued. .

After the operation for a certain period of time, when the transfer of the precipitate to the gravity classifier 14 is completed, the circulation pump 15 is stopped (when a plurality of second precipitate transfer devices 50 are provided, The operation is repeated by switching to the next transfer device 50).

(2) Reverse cleaning operation (first-stage cleaning): valve V
2 and V4 are closed, V6, V7, and V8 are opened, the washing pump 40 is started, and washing water is injected into the classifier 14 from the washing pipe 37, and the subsequent classifier A with the sieve is discharged from the sieve outlet 14e. Transfer to

(3) Second stage transfer operation of sedimentation: valve V
7, V8 is closed, V9 and V11 are opened, and the transfer pump 43
Is started, and after a predetermined time elapses, the valve V10 is opened, and the rotary feeder 35 is started. As a result, the sediment in the sedimentation reservoir 19 is transferred to the classifier B at the subsequent stage through the pressure feed pipe 36. After a certain period of operation, when the transfer to the classifier B at the subsequent stage of the sand setting is completed, the transfer pump 43 is stopped.

As is clear from the above description, in the first sediment transporting apparatus 10, since the siphon is formed and the sediment is transported, there is no energy loss due to the transport of the sewage itself, which is extremely efficient. Transport is possible,
Power costs can be significantly reduced. In addition, since it is possible to circulate the wastewater in the treatment pond with the fluid that mediates the transfer of the sediment, not only can the water cost be significantly reduced, but also the use of less clarified water reduces The cleaning effect by mechanical cleaning, replacement of sewage with clear water, and mechanical peeling in the pressure feed pipe 36 is also increased.

When the circulating pump 15 is constituted by a self-priming water pump, the circulating pump 15 itself can also serve as a degassing means. Transfer line 1
It is possible to form a siphon by evacuating the inside of 3.
In that case, the deaeration port 14 of the top wall 18b of the gravity classifier 14
The deaeration pipe 17 connected to c may be connected to the transfer pipe section 13b on the suction side of the circulation pump 15.

However, when degassing is performed only by the self-priming water pump, the degassing time becomes long. Therefore, in this embodiment, the vacuum pump 16 is started only at the beginning of operation to shorten the degassing time. Once the siphon is formed, the deaeration operation can be omitted unless there is a special reason.

Next, in the second sediment transfer device 50, the discharge water of the first sediment transfer device 10 discharged from the discharge port 12 a by the circulation pump 15 is injected into the header chamber 54, Since the precipitate is transferred to the suction port 11a of the precipitate transfer device 10, the entire system of the precipitate transfer device can be made extremely efficient. Further, since there is no portion accompanied by mechanical loss unlike the conventional screw type, the life is short and the maintenance is easy.

Although not shown, the gravity classifier 14
An intermediate drainage pipe equipped with a valve is attached to the outer shell 18 above the sedimentation reservoir 19, and after draining water from this intermediate drainage pipe,
Pressurized air may be injected from an empty washing pipe attached near the washing pipe 37 to perform air cleaning of the sand.

Further, in the present embodiment, the second sediment transfer device 50 is installed in the sewage submerged for use with the first sediment transfer device 10, but the present invention is not limited to this. In addition, the same operation and effect can be obtained even when installed in the atmosphere.

Further, the second sediment transfer device used in combination with the first sediment transfer device 10 does not necessarily have to be the sediment transfer device 50 having the structure shown in FIGS. A conventional transfer device such as a screw conveyor may be used, but in that case, the discharge end of the circulation pump 15 may be simply immersed in the wastewater of the treatment pond. Also, the second precipitate transfer device 50 is omitted,
It is also possible to use the first precipitate transfer device 10 alone.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire configuration of an embodiment of a precipitate transfer device according to the present invention.

FIG. 2 is a longitudinal sectional view of a gravity classifier provided in the first precipitate transfer device.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view schematically showing the entire configuration of a second precipitate transfer device.

FIG. 5 is a side view of the gutter seen from the downstream end side.

FIG. 6 is an enlarged cross section near the downstream end of the gutter.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Settling basin 10 1st sediment transfer apparatus 11 Suction pipe 11a Suction port 12 Discharge pipe 12a Discharge port 13 Transfer pipe 14 Gravity classifier 14a Inlet 14b Outlet 14c Deaeration port 14d Sediment exit 14e Sieve residue outlet 15 Circulation Pump 16 Vacuum pump 18 Outer shell of gravity classifier 19 Sediment reservoir 20 Screen 21 Screen bar 22 Screen room 23, 24 Partition plate 30 Hollow room 31 Inflow tube 30 Side plate 32 Sieve residue reservoir 33 Outflow tube 40 Washing pump 43 Transfer pump 50 No. 2 sediment transfer device 51 gutter 52 guide plate 53 sediment transfer chamber 54 header chamber 55 pressure water jet 56 blow-up prevention plate 57 horn

Claims (14)

[Claims] 1. A device for transferring a sediment deposited on the bottom of a sewage treatment pond, comprising a suction opening at one end open to the underwater bottom of the sewage treatment pond, and immersing the other end into the water of the sewage treatment pond. A gravity classifier that separates and removes sediment in sewage into sieve residue and sediment, and a circulation pump in order from the suction port side to the discharge port side. An interposed transfer line, and deaeration means for deaeration in the gravity classifier and the transfer line, activating the deaeration means to cause the inside of the gravity classifier and the transfer line After forming a siphon by degassing the inside and filling the gravitational classifier and the transfer pipe with sewage, the circulating pump is started, and the sediment is discharged from the suction port together with the sewage through the gravity. A precipitate transfer device for transferring to a classifier. 2. The apparatus according to claim 1, wherein said degassing means comprises a vacuum pump. 3. The apparatus for transferring a sediment according to claim 1, wherein said circulation pump also serves as said deaeration means. 4. The gravity classifier has an outer shell comprising a cylindrical peripheral wall having a lower part conically squeezed and having a sedimentation outlet at a lower end, and a top wall connected to a deaeration pipe and covering an upper part of the peripheral wall. A sedimentation basin communicating with the sedimentation outlet is formed in an inner lower part of the outer shell, and a screen that allows the passage of sewage and the sedimentation in the sewage; a part of the cylindrical peripheral wall; An arc-shaped screen chamber formed by the partition plate is provided in the inner upper layer of the outer shell together with a hollow portion adjacent to the screen on the opposite side to the screen chamber side and communicating with the lower sand basin. In the screen, a plurality of screen bars having a plane shape curved in an arc shape along the cylindrical peripheral wall at a substantially intermediate portion between the cylindrical peripheral wall and a central axis are arranged at predetermined intervals in the vertical direction. And stack An inflow pipe of sewage containing sediment is connected to one end of the screen chamber, and a sieve having a lower end provided with an outlet of the sieve which is stored at a lower end of the sieve which is prevented from passing by the screen. A residue reservoir is connected to the other end of the screen chamber, and an outflow pipe of sewage from which sediment has been removed is connected to the hollow part, and the inflow pipe, the outflow pipe, and the sieve residue reservoir are connected to the cylindrical body. The sediment transfer device according to any one of claims 1 to 3, wherein the sediment transfer device extends in a tangential direction of the peripheral wall. 5. The apparatus for transferring a sediment according to claim 4, wherein a washing pipe is provided in a lower portion of said conical outer shell. 6. The sediment transfer device according to claim 4, wherein a rotary feeder is provided at the sand setting outlet, and the rotary feeder communicates with a sedimentation feeding pipe. 7. The sewage treatment tank according to claim 1, wherein a second sediment transfer passage for transferring the sediment toward the suction port is provided at a bottom of the sewage treatment pond. 2. The apparatus for transferring a precipitate according to claim 1. 8. A long gutter having an open upper edge, the gutter being partitioned into an upper sediment transfer chamber and a lower header chamber, the gutter being arranged along the longitudinal direction of the gutter. A plurality of guide plates, and a pressure water inlet provided at an upstream end of the header chamber, wherein the plurality of guide plates are arranged such that edges adjacent to each other in the longitudinal direction of the gutter are downstream. In such a manner that the guide plates are overlapped with each other so as to be downward, and a pressure water jet for the precipitate transfer chamber is formed between the upper and lower guide plate edges in the overlap portion. The sediment transfer is performed by injecting pressure water into the header chamber from the pressure water inlet and ejecting the pressure water from the pressure water inlet toward the downstream side of the gutter. The sediment in the room is located downstream of the gutter. The precipitate transfer device, characterized in that the feed. 9. An inlet at one end is provided at a downstream end of the gutter,
The discharge port at the other end is the pressure water injection port, and a gravitational classifier that separates and separates sediment in sewage into sieve residue and sediment, and a circulation pump, on the way, from the suction port side. A transfer pipeline interposed sequentially toward an outlet side; and a degassing unit for degassing the inside of the gravity classifier and the inside of the transfer pipeline, wherein the degassing unit is activated to activate the gravity classifier. A siphon is formed by evacuating the inside of the transfer pipe and the inside of the transfer pipe, and after filling the inside of the gravity classifier and the inside of the transfer pipe with sewage, the circulating pump is started and sedimentation from the suction port is performed. The sediment transfer apparatus according to claim 8, wherein the sediment is transferred to the gravity classifier together with the waste water. 10. The sediment according to claim 8, wherein said plurality of guide plates have a length in a longitudinal direction of said gutter shortened toward a downstream side of said gutter. Transfer device. 11. The sediment transfer device according to claim 8, wherein a direction of a guide plate arranged at a downstream end of the gutter is changed. 12. A gravity classifier that separates and removes sediment contained in sewage into sieve residue and sediment, wherein the lower part is conically squeezed and a cylindrical peripheral wall provided with a sediment outlet at the lower end; An outer shell consisting of a top wall covering an upper part of the peripheral wall, and a sedimentation basin communicating with the sedimentation outlet is formed in an inner lower part of the outer shell to allow passage of sewage and sediment in the sewage. A screen, a part of the cylindrical peripheral wall, and an arc-shaped screen chamber formed by being surrounded by upper and lower partition plates are adjacent to the screen chamber side on the side opposite to the screen chamber side and the lower area. The screen is provided in the inner upper layer of the outer shell together with the hollow portion communicating with the sedimentation reservoir, and the screen is a plane curved in an arc shape along the cylindrical peripheral wall at a substantially intermediate portion between the cylindrical peripheral wall and a central axis. Multiple screens with shape Bars are stacked at predetermined intervals in the vertical direction, and an inflow pipe of sewage containing sediment is connected to one end of the screen chamber, and the sieve residue blocked from passing by the screen is removed. A sieving reservoir having an outlet of the sieving residue at the lower end thereof is connected to the other end of the screen chamber; an outlet pipe of the sewage from which sediment has been removed is connected to the hollow part; A gravity classifier, wherein the outlet pipe and the sieve residue are extended in a tangential direction of the cylindrical peripheral wall. 13. The gravity classifier according to claim 12, wherein a washing pipe is provided in a lower portion of the conical outer shell. 14. The gravity classifier according to claim 12, wherein a rotary feeder is provided at the sand settling outlet, and the rotary feeder communicates with a sand settling feed pipe.