JP2019098281A - Sand lifting water treatment equipment and sand lifting water treatment method - Google Patents

Abstract

To provide sand lifting water treatment equipment and a sand lifting water treatment method by which even refuse having a heavy specific gravity can be separated from sedimentary sand.SOLUTION: Sand lifting water treatment equipment 1, which treats sand lifting water containing sedimentary sand and refuse which are pumped from a sand sedimentation pond by a sand lifting pump, comprises: a flowing water trough 11 in which sand lifting water flows; a screen 21 which is located on a downstream side of the flowing water trough 11, stops refuse from sand lifting water and removes the refuse; and a sedimentary sand washing device (or a sedimentary sand separator for separation of sedimentary sand) 31 which performs removal and dewatering of fine dirt from sand lifting water which has passed the screen 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sand rising water treatment apparatus and a sand rising water treatment method.

In recent years, in the sedimentation basin, work environment improvement and joint sewerage improvement measures (dry) are progressing, and a mechanical type fine screen (for example, 25 mm eye width etc.) for separating waste is installed in the front stage in the sedimentation basin. Facilities are increasing. As a result, the waste is separated (removed) efficiently, and the sedimentation pump is used to lift the sediment deposited on the bottom of the sedimentation basin.
However, some of the waste passes through the above-mentioned fine screen and mixes with sediment, which causes troubles in separation and cleaning of sediment and disposal.

Then, there exists Unexamined-Japanese-Patent No. 2006-305549 (patent document 1) as a background art of this technical field. In this publication, "at the boundary between the falling sand and the waste caused by the difference in specific gravity and the shape, in the outlet side of the running water trough, which separates the sand and the waste in the sediment and discharges it. A separation plate is disposed along the downflow direction of water, and sand and refuse flowing down the flowing water trough are separated and discharged using the water flow due to the difference in specific gravity and the difference in shape. " It is described as (see summary).

  As another background art, there is JP-A-2017-140561 (patent document 2). In this publication, "sedimentation processing system includes a lift pump for pumping up the treated water containing sediments and debris deposited on the bottom of the settling tank, and an introduction pipe which is disposed at the top and introduces the treated water from the lift pump. An overflow weir provided parallel to the introduction direction of the water to be treated, a return pipe for returning the water to be treated after overflowing the overflow weir to the sedimentation basin, and a transfer pipe for transferring the water to be treated to the running water trough And a water flow trough having a separation plate for separating sediment and dirt contained in the treated water flowing in through the transfer pipe.

JP, 2006-305549, A Unexamined-Japanese-Patent No. 2017-140561

The techniques of Patent Documents 1 and 2 are both techniques for separating refuse and sediment by difference in specific gravity, and refuse with light specific gravity is separated from sediment.
However, there are wastes with heavy specific gravity such as metal and the like among the wastes, and the waste with heavy specific gravity has a problem that it is difficult to separate it from settling.
Therefore, an object of the present invention is to provide a sand rising water treatment apparatus and a sand rising water treatment method capable of separating waste having a heavy specific gravity from sediment settling.

  In order to solve the above-mentioned problems, one embodiment of the sand rising water treatment apparatus of the present invention is a sand rising water treatment apparatus for treating sand rising water containing sediment and refuse collected by a sand rising pump from a sand settling tank, A fine sediment for a flowing water trough through which sand rising flows, a screen disposed downstream of the water running trough for blocking and removing the refuse from the sand rising from the sand rising through the screen It is characterized in that it comprises a sediment settling apparatus for removing and draining, or a sediment settling apparatus for separating sediment.

  One embodiment of the method for treating sand discharge water according to the present invention is a sand discharge water treatment method for treating sand discharge sand containing sediment and refuse pumped from a sand settling tank by means of a sand discharge pump, wherein the sand discharge water is used as a running water trough. The first step of flowing, the second step of stopping and removing the refuse from the sand rising water by the screen disposed on the downstream side of the flowing water trough, and the sand settling water for the sand rising water passing through the screen It is characterized by comprising a third step of removing and draining fine dirt by a cleaning device or separating sediments by a sediment separation device.

According to the present invention, it is possible to provide a sand rising water treatment apparatus and a sand rising water treatment method capable of separating waste with heavy specific gravity from sedimentation.
Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the sedimentation basin provided with the sand rising water treatment apparatus which concerns on Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the sand rising water treatment apparatus which concerns on Example 1 of this invention. It is a top view of a test device which verifies about a sand rising water processing unit concerning Example 1 of the present invention. It is an illustration of the table which made a list of acquisition of a basic design numerical value which a test which verifies about a sand rising water processing unit concerning Example 1 of the present invention aims, and a measurement item. 7 is a graph in which the particle diameter of silica sand No. 7 used in the test for verifying the sand rising water treatment apparatus according to the first embodiment of the present invention is taken on the horizontal axis, and the percentage occupied by sand grains of the flow diameter is taken on the vertical axis. The table which shows the test condition of the test verified about the sand rising water treatment apparatus which concerns on Example 1 of this invention is shown in figure. It is a graph which shows the performance confirmation result of the test verified about the sand rising water treatment apparatus which concerns on Example 1 of this invention. The table | surface of the result of having calculated | required the length of the required upstream trough changing the conditions of the test verified about the sand rising water treatment apparatus which concerns on Example 1 of this invention is shown in figure. It is a graph of the result of having changed the conditions of the test verified about the sand rising water processing apparatus concerning Example 1 of this invention, and having calculated | required the length of the required upstream trough. It is illustration of the table | surface which shows the list of the test result of the test verified about the sand rising water treatment apparatus which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view of the sand rising water treatment apparatus which concerns on the modification of Example 1 of this invention. It is a longitudinal cross-sectional view of the sand rising water processing apparatus which concerns on Example 2 of this invention. It is a longitudinal cross-sectional view of the sand rising water treatment apparatus which concerns on the modification of Example 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Example 1
FIG. 1 is a longitudinal cross-sectional view of a sedimentation basin provided with the sand rising water treatment apparatus of the first embodiment. The sediment settling basin 101 is a settling basin, a rainwater stagnant pond, etc. installed in a sewage treatment facility, a pump station, a water purification facility and the like. As shown by an arrow 102 from the right side in FIG. 1, water containing sediment flows into the sediment settling basin 101. The surface of the inflowing water is indicated by reference numeral 104.

  In the pond bottom 103 of the settling basin 101, sand collecting devices 111 are respectively provided on the left and right in FIG. The sand collecting device 111 is, for example, a nozzle type or a screw conveyor type, and the sediment deposited on the sand collecting device 111 is a recessed portion formed between the left and right sand collecting devices 111 in FIG. Collect in pit 112. A suction port 121 is provided in the raised sand pit 112. The suction port 121 is provided at one end of the sand raising pipe 122, and the other end of the sand raising pipe 122 is connected to the suction side of the sand raising pump 123. The lift sand pump 123 is configured of a self-priming type land pump, a submersible sand pump or the like.

  The sand pump 123 sucks water containing sediment deposited in the sand pit 112 through the sand pipe 122, and further the sand (water) through the supply pipe 124. Pump to 1. The supply pipe 124 is provided with a switching valve 126 in which a check valve 125 is disposed on the discharge side of the sand raising pump 123. Although not shown, a mechanical fine screen is provided on the water inlet side of the settling basin 101 to separate the waste. The water after this waste separation flows into the sedimentation basin 101. Further, water accumulated in the sediment settling basin 101 is discharged from the pump well 105 provided in the pond bottom 103 of the sediment settling basin 101 by the main pump 106.

By the way, the techniques of Patent Documents 1 and 2 are all techniques for separating garbage and sediment by the difference in specific gravity in the sand rising water treatment apparatus, and garbage with a small specific gravity is separated from sediment.
However, some wastes, such as those made of metal, have a high specific gravity, and the waste having this high specific gravity is difficult to separate from settling.
The present embodiment 1 provides a raised sand water treatment apparatus 1 which solves such problems and enables wastes with heavy specific gravity to be easily separated from sediments. Hereinafter, the sand rising water treatment apparatus 1 will be described.

  The raised sand processing apparatus 1 is provided with a flowing water trough 11, a screen 21, and a sand washing apparatus (or sediment separation apparatus) 31. The sand rising water supplied from the supply pipe 124 passes through the flowing water trough 11 and is applied to the screen 21, and the dust is separated on the screen 21. The details of the flowing water trough 11 and the screen 21 will be described later.

  When the sand washing apparatus (or sediment separation apparatus) 31 is a sand washing apparatus, removal and drainage of fine dirt are performed on the sand rising water that has passed through the screen 21. When the sand washing apparatus (or the sedimentation separation apparatus) 31 is a sedimentation separation apparatus, the sedimentation of the sand rising water passing through the screen 21 is separated. The water treated by the sand washing apparatus (or sediment settling apparatus) 31 is discharged to the outside of the sand rising water treatment apparatus 1 as drainage. The separated sediments are discharged to hoppers 32 provided outside the pumped sand processing apparatus 1.

FIG. 2 is a longitudinal sectional view of the sand rising water treatment apparatus 1. Hereinafter, FIG. 1 is also referred to as appropriate. The flowing water trough 11 is a member into which the sand rising water pumped by the sand rising pump 123 through the supply pipe 124 first flows. In FIG. 2, sand pumping water is pumped from the right as indicated by the white arrow. The flowing water trough (trough) 11 is a trough made of, for example, a steel plate, the longitudinal direction of which is inclined downward toward the screen 21 described later, and the cross sectional shape thereof is, for example, substantially U-shaped. A plurality of the flowing water troughs 11 may be arranged in parallel in the direction perpendicular to the paper surface of FIG.
The length of the flowing water trough 11 is preferably such that the water area load is greater than 0 m ³ / (m ² · d) when the water area load is less than or equal to 1800 m ³ / (m ² · d).
More preferably, the length of the flowing water trough 11 is such that the water area load is from 1800 m ³ / (m ² · d) to 700 m ³ / (m ² · d).

Here, “m ³ / (m ² · d)”, which is a unit of “water area load”, indicates how many m ³ of water flow per 1 m ² in top view of the flowing water trough 11 (See Sewerage Facility Planning and Design Guideline and Commentary, Part 1 2001, page 367). The basis of the above figures for water area load will be described later.

In the sand rising water treatment apparatus 1 of the first embodiment, the screen 21 is provided on the downstream side of the flowing water trough 11 so that the sand rising water 202 flowing through the flowing water trough 11 and reaching the upstream side passes through the screen 21. There is. The screen 21 is stored in the screen storage unit 22, and the screen storage unit 22 is connected to the flowing water trough 11. The screen 21 is inclined downward to the running water trough 11 side, for example, in the plate width direction, somewhat more than horizontal, and the sand rising water 202 flowing from the running water trough 11 falls on the screen 21.
The screen 21 is formed in a slit shape in which a plurality of members such as a flat plate, a round bar, or a pipe shape are continuously arranged with a predetermined eye width. The eye width of the screen 21 is preferably about 100 mm or less.

  The screen storage unit 22 blocks the dust 201 contained in the sand rising water 202 by the screen 21 continuously arranged with a predetermined eye width. The sand washing apparatus (or sedimentation separation apparatus) 31 (the same apparatus as the sand separation apparatus) disposed in the lower part of the screen storage unit 22 passes through the screen 21 and water other than the dust 201 and sedimented sand 203 (refined water 202). 2 only flows into the upper part).

The separated waste 201 remains on the screen 21. Therefore, on the side opposite to the flowing water trough 11 side of the screen 21, a bowl-like dust outlet 23 is connected, and an open / close door 24 is also provided. From time to time, the worker opens the open / close door 24 and scrapes out the waste 201 remaining on the flowing water trough 11 using the rake 25 etc. out of the screen storage 22 via the waste extraction port 23.
The sand rising water 202 which has passed through the screen storage unit 22 is treated by a sand washing apparatus (or sediment settling apparatus) 31.

Although a sand washing apparatus and a sediment settling apparatus are well known, one configuration example of each will be briefly described. In the sand washing apparatus, the sand rising water 202 is put into the washing tank, and the washing water is also added to perform stirring and regrinding. Then, the fine soil is removed by draining, sediment settling is drained and conveyed by the screw conveyor, and the purified sediment is discharged to the hopper 32 (FIG. 1).
The sediment separating apparatus allows the sand rising water 202 to flow into the separating hopper and separates the sediment from the sewage by the cyclone effect by the swirling flow generated in the separating hopper. The separated sediment is drained and conveyed by a screw conveyor, and the separated sediment is discharged to the hopper 32 (FIG. 1).

  Here, the reason that the flowing water trough 11 is provided on the upstream side of the screen 21 is that the sand rising water 202 passing through the screen 21 is pumped from the sand rising pump 123. That is, when the capacity of the sand raising pump 123 is high, there is a possibility that the dust 201 contained in the sand rising water 202 may pass through the screen 21 by the momentum of the pumping. Further, in a state where the waste 201 captured by the screen 21 remains on the screen 21, the sediment settling 203 which has flowed with the pumped sand 202 is blocked by the waste 201 on the screen 21 and can not pass through the screen 21. There is also a fear that

Therefore, in the first embodiment, the flowing water trough 11 is used to suppress the possibility that the dust 201 passes through the clean 21 and also to prevent the sediment 201 from being blocked by the dust 201 on the screen 21. The length of the water is adjusted so that the water area load takes on the above-mentioned appropriate value.
That is, by appropriately adjusting the water area load, the waste water may pass through the clean 21 by passing the running water trough 11 before reaching the screen 21 and removing the momentum of the sand raising water 202 to some extent. It can be suppressed.
Further, by properly adjusting the water area load, the floating waste 201a that may float at least near the water surface among the waste 201 and the sediment settling 203 (including partially sedimented waste) separate the downflow zones on the screen 21. That is, in FIG. 2, the floating dust 201a flows down to the screen 21 shaped zone 21a, and the sediment settling 203 flows down to the zone 21b. This is because the momentum of the water flowing down to the screen 21 is reduced to a certain extent, so it is possible to suppress the floating debris 201a from sinking into the water by the momentum of water and mixing with the sediment 203 and flowing down onto the screen is there. Among the wastes 201, the deposited waste 201b having a heavy specific gravity is likely to flow down to the zone 21b.
As described above, by satisfying the above-described water area load condition, the recovery rate of settling sand included in the raised sand water 202 treated by the raised sand water treatment apparatus 1 shows a good numerical value of 50 to 60%.

In the following, the length of the flowing water trough 11 is preferably based on a water area load of less than or equal to 1800 m ³ / (m ² · d) and preferably greater than 0 m ³ / (m ² · d) Test data will be described.
FIG. 3 is a plan view of the test apparatus 51. As shown in FIG. The test apparatus 51 is configured centering on a trough formed of a steel plate and having a substantially U-shaped cross section. That is, it has a linear upstream trough 52 having a length of 3000 to 8000 mm, and an overflowing trough 53 having a length of 2000 mm which is linearly connected to the downstream side of the upstream trough 52. The total length of the upstream trough 52 and the overflow trough 53 is 5000 to 10000 mm. The width of the upstream trough 52 and the overflow trough 53 is 500 mm. Further, a water dividing rod 81 is installed at the boundary between the upstream trough 52 and the overflow trough 53 so that the plate width direction forms an acute angle with the longitudinal direction of the upstream trough 52 and the overflow trough 53. There is. The water divider 81 corresponds to the "separating plate" in Patent Document 1 mentioned above. A concentrated water trough 54 branches off from the boundary between the upstream trough 52 and the overflow trough 53. The distance from the center of the upstream trough 52 and the overflow trough 53 to the tip of the concentrated water trough 54 is 2000 mm, and the width of the concentrated water trough 54 is 500 mm.

One end of a pipe 56 (200 mm in diameter) provided with a manual valve 55 is connected to the downstream side of the overflow side trough 53, and the other end extends to the overflow water receiving tank 57 (volume 1000 L). Further, one end of a pipe 59 (diameter 200 mm) provided with a manual valve 58 is connected to the downstream side of the concentrated water trough 54, and the other end extends to the concentrated water receiving tank 60 (volume 2000 L). The pipes 63 and 64 (diameter 200 mm) provided with the manual valves 61 and 62 are branched from positions before the manual valves 55 and 58 of the pipes 56 and 59 respectively, and the ends of the pipes 63 and 64 are raw water It extends to the tank 65. The raw water tank 65 is provided with a pump 66 (simulating the lift sand pump 123), and the water in the raw water tank 65 is made upstream of the upstream trough 52 via a pipe 68 (diameter 100 mm) equipped with a manual valve 67. Pumping (0.5 to 1.3 m ³ / min). A pipe 70 (50 mm in diameter) provided with a manual valve 69 is branched from a position on the near side of the manual valve 67 of the pipe 68, and the tip of the pipe 70 returns to the raw water tank 65.

  In FIG. 3, the upstream trough 52 is for flowing water containing sand that simulates sand rising from the left to the right. And since this test apparatus 51 is provided with the water divider 81 equivalent to the "separating plate" in the said patent document 1, if it actually flowed sand rising water, the garbage with a light specific gravity in sand rising water Flows over the water dividing weir 81 together with the water toward the overflowing trough 53 (overflowing water). That is, the test apparatus 51 simulates the apparatus of Patent Document 1, and in Example 1 and Patent Document 1, an apparatus for removing dust (the screen 21 of Example 1 or Patent Document 1) There is a difference between However, since both of them have a trough (upstream trough 52) of a certain length provided in front of the device for removing dust in common, in order to confirm the function and effect of the running water trough 11 of the first embodiment. The results of tests conducted using the test apparatus 51 are informative.

  In this test, water simulating pumped sand is poured into the upstream trough 52 of the test device 51, “sand recovery rate” ((concentrated water amount × concentrated sand concentration) ÷ (input water amount × input sand concentration)), “concentrated For items such as “scale factor” (concentrated water sand concentration ÷ input water sand concentration), “distribution amount” of “water” and “sand” (overflow water (water exceeding water diversion 81)) and concentrated water (water diversion) To confirm the performance of the amount distributed to the water) not exceeding 81).

  FIG. 4 illustrates a table in which acquisition of basic design values targeted by this test and measurement items are listed. The basic design items are "conveyed water volume", "water area load", "trough length", "watershed height" and "water distribution ratio". The "conveyed water amount" is the maximum sand volume ratio that can be conveyed, and is determined by vol%. This is determined by the "distribution amount" of "water" and "sand". The “water area load” is measured on the upstream side of the water weir 81, that is, on the upstream trough 52. This is determined by the "distribution amount" of "sand" only. “Trough length” is the required trough length of the upstream trough 52 upstream of the water weir 81. This is judged by "sand recovery rate". Moreover, this will be judged by the "distribution amount" of only "sand". The “height of water diversion weir” is judged by “concentration factor” and “sand recovery rate”. This is determined by the "distribution amount" of "water" and "sand". "Distribution rate of water" will be judged by "distribution amount" of "water" only.

  In addition, silica sand No. 7 was used as a test sand for simulation used for simulated sand rising water. The silica sand No. 7 used had a median particle diameter of 200 μm, and the graph in which the particle diameter is taken along the abscissa and the percentage occupied by sand grains of the diameter is taken along the ordinate is shown in FIG. Here, the central particle size is set to 200 μm (0.2 mm) in order to remove sedimentation with a particle diameter of 0.2 mm or more in the sewage settling basin (Sewerage facility plan and design guidelines and commentary, the first edition 2001 edition, See page 367).

  FIG. 6 shows the test conditions of this test. The “conveyed water amount” is the same as in FIG. The “nozzle” in the “water supply nozzle diameter” and the “nozzle portion flow rate” is the “nozzle” on the upstream side of the upstream trough 52 to which the pipe 68 is connected. For the “in-trough flow velocity”, the “trough length” and the “water area load”, the upstream trough 52 is a target. “Watershed height” is the height of the watershed 81. By changing each condition, "water area load" is changed variously.

  Next, the method of this test will be described. In this test, the water simulating the raised sand is flowed to the upstream trough 52, and the overflow water flowing toward the overflow trough 53 side until the flow of the upstream trough 52 reaches a desired desired state; The concentrated water flowing toward the concentrated water trough 54 is made to flow to the raw water tank 65. This can be realized by fully closing the manual valves 55, 58 and fully opening the manual valves 61, 62. The discharge amount of water of the pump 66 was adjusted using an inverter.

  Then, after the flow of the upstream trough 52 reaches a desired desired state, the manual valves 61 and 62 are closed and the manual valves 55 and 58 are opened, so that the overflow water and the concentrated water are respectively overflow water receiving tanks 57, It stored in the concentrated water receiving tank 60, and each measurement was performed. This was performed about each test condition of FIG. The manual valve 69 and the pipe 70 are for stirring sand in the raw water tank 65.

First, the results of "sand recovery rate" will be described. FIG. 7 is a graph of test results in which the horizontal axis is the water area load and the vertical axis is the sand recovery rate. As apparent from the graph of FIG. 7, in the test device 51, when the water area load of the upstream trough 52 is 1800 m ³ / (m ² · d) or less, the sand recovery rate shows a good numerical value of 50 to 60%. The The test conditions in this case are sand particle diameter of about 0.2 mm, and height 30 mm of diversion weir. The sand flows down the lower layer portion of the upstream trough 52, and is distributed to the concentrated water side by the diversion weir 81, but it is considered that a part of it has overflowed. Also, the sand recovery rate decreased as the water area load increased. It is considered that the sand flowed down to the diversion weir 81 in a floating state, and the overflow of the sand at the diversion weir 81 increased.
The “conveyed water amount” is about 20 times or more of the sedimented amount (the amount of sand is 5 vol% or less). The maximum value of the transportable sand volume ratio is 10.7 vol% on the concentrated water side, so leave 5 vol% or less in anticipation of allowance.

8 and 9 show the required upstream trough 52 lengths obtained under different conditions. The “in-trough flow rate” is the flow rate in the upstream trough 52.
The plots of the white circles in FIG. 9 represent the case where the transport water volume was 0.5 m ³ / min, the plots of the white triangles represent the transport water volume 1.0 m ³ / min, and the plots of the black squares represent the case where the transport water volume was 1.3 m ³ / min. Each is shown.
Moreover, FIG. 10 is a test result list of this test. The “conveyed water amount” is the amount of water flowing through the upstream trough 52 per second. The "water distribution rate" is indicated as "overflow" for the overflow water and "concentrate" for the concentrated water. The “sand concentration” indicates that of overflow water as “overflow”, that of concentrated water as “concentration”, and what is introduced to the upstream trough 52 is indicated as “input”.

From the results shown in FIGS. 8 to 10, the necessary length (trough length) of the upstream trough 52 is 3 m to 8 m under the condition that the water area load is 1800 m ³ / (m ² · d) or less. Under this condition, the sand recovery rate shows a good value of approximately 50 to 60%. These test results are applied to the sand rising water treatment apparatus 1.

Next, the operation and effect of the sand rising water treatment apparatus 1 will be described with reference to FIG.
First, the sand rising water 202 is made to flow in the running water trough 11 using the sand rising water treatment apparatus 1 having the above-described configuration (first step). The conditions necessary for the flowing water trough 11 are as described above. And the refuse 201 is dammed and removed from the sand rising water 202 with the screen 21 arrange | positioned downstream of the flowing water trough 11 (2nd process). Then, removal and drainage of fine dirt are performed by the sediment settling washing apparatus for the sand rising water 202 that has passed through the screen 21 (or settling of sediment settling is performed by the sediment settling separation apparatus) (third step). The sand rising water 202 is treated by the above steps. And the favorable result of 50 to 60% of sand recovery rates can be obtained.

According to the sand rising water processing apparatus 1 described above, since the screen 21 is provided downstream of the flowing water trough 11 for stopping and removing the refuse from the sand rising sand, the refuse having a heavy specific gravity can also be separated from the sedimentation. It is possible to prevent waste from being mixed with sand after treatment.
Here, the flowing water trough 11 should have a length such that the water area load is greater than 0 m ³ / (m ² · d) when the water area load is less than or equal to 1800 m ³ / (m ² · d). Furthermore, the length is preferably 3 to 8 m.
According to the test results described above, under such numerical conditions, the speed of the sand pumped by the sand pumping pump 123 is adjusted by the running water trough 11, and the sand recovery rate is a good numerical value of approximately 50 to 60%. It can be done.

In particular, the flowing water trough 11 preferably has a water area load of 1800 m ³ / (m ² · d) to 700 m ³ / (m ² · d). As described above, if the water area load is less than 1800 m ³ / (m ² · d), good results can be obtained with sand recovery rate etc. However, if the amount of water per unit time flowing through the flowing water trough 11 is too small, The treated water volume of the sand rising water by the sand rising water treatment apparatus 1 is too small to be practical as a plant facility. The lower limit value of the water area load needs to be about 700 m ³ / (m ² · d) in order to maintain a realistic treated water volume, so here the lower limit value of the water area load is 700 m ³ / (m ²・ D).

Modification of First Embodiment
Next, a modification of the first embodiment will be described. In each of the embodiments and modifications described below, members and the like common to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description will be omitted.

FIG. 11 is a longitudinal cross-sectional view of a sand rising water treatment apparatus 1a according to a modification of the first embodiment. The difference between the sand rising water treatment apparatus 1 a and the sand rising water treatment apparatus 1 is that a buffer tank 71 is connected to the upstream side of the flowing water trough 11. The buffer tank 71 is a device for adjusting the flow rate and the flow rate of the sand rising water 202 flowing into the flowing water trough 11 to be less than or equal to a certain level.

  In FIG. 11, the buffer tank 71 is shown in a longitudinal sectional view. Further, the direction of the flow of the sand rising water 202 is indicated by a black arrow. The upper surface 72 of the buffer tank 71 is provided with an introduction pipe 73 for introducing the sand rising water 202 pumped up by the sand rising pump 123 (FIG. 1) into the buffer tank 71. The sand rising water 202 is pressure-fed into the buffer tank 71 via the introduction pipe 73 (open arrow). The buffer tank 71 is continuous with both ends of the first side wall 74 and the first side wall 74, and the second side wall and the third side wall arranged to face each other And a fourth side wall 75 disposed to face the first side wall 74, and has a tubular shape in a top view angle. The first side wall 74 is provided with a transfer pipe 76 for transferring the sand rising water 202 to the flowing water trough 11.

  In the buffer tank 71, an overflow weir 78 is provided to stand vertically upward from the bottom surface 77 of the buffer tank 71. In other words, the overflow weir 78 is installed in parallel to the introduction direction (inflow direction) of the sand rising water 202 flowing from the introduction pipe 73. In addition, the buffer tank 71 is disposed on the bottom surface 77 and has a return pipe 79 extending downward in the vertical direction parallel to the introduction direction of the sand rising water 202 flowing in from the introduction pipe 73. In addition, the transfer pipe 76 is disposed in the vicinity of the bottom surface 77 of the buffer tank 71 in the first side wall 74, and is substantially orthogonal to the introduction direction of the raised sand 202 flowing from the introduction pipe 73. Extends horizontally from the The introduction pipe 73, the transfer pipe 76, and the return pipe 79 are disposed on the opposite side across the overflow weir 78.

  Here, the flow of the sand rising water 202 flowing into the buffer tank 71 from the introduction pipe 73 will be described. First, the sand rising water 202 pumped up by the sand rising pump 123 flows down the inside of the buffer tank 71 in the vertical direction via the introduction pipe 73. When the flow-down sand rising water 202 reaches the bottom surface 77, the direction of the flow is folded back to the rising direction along the first side wall 74 and the overflow weir 78, respectively. The sand rising water 202 rising along the inner wall of the first side wall 74 in the flow of the sand rising water 202 which has been folded back flows into the flowing water trough 11 via the transfer pipe 76 (is transferred). On the other hand, of the flow of the rising sand water 202 which has been turned back, the rising sand water 202 rising along the overflow weir 78 overflows the upper end of the overflow weir 78 and flows downward again in the vertical direction, It is returned to the sedimentation basin 101 through the return pipe 79. Therefore, among the sand rising water 202 flowing into the buffer tank 2 through the introduction pipe 73, the sand rising water 202 excluding the sand rising water 202 that overflows the overflow weir 78 is the transfer pipe 76. It is conducted to the flowing water trough 11 via the water passage.

  Thereby, the sand rising water 202 conducted to the flowing water trough 11 via the transfer pipe 76 is limited to the sand rising water 202 in the storage area 80 immediately above the bottom surface 77 not overflowing the overflow weir 78. Therefore, the flow rate and the flow rate of the sand rising water 202 flowing into the flowing water trough 11 can be adjusted to be less than or equal to a certain level. Therefore, even if a high output pump is used as the sand raising pump 123, the flow rate of the sand rising water 202 in the flowing water trough 11 can be restricted and the flow of the sand rising water 202 in the flowing water trough 11 can be stabilized. . For more detailed structure and operation of the buffer tank 71, refer to JP-A-2017-140561.

Example 2
FIG. 12 is a vertical cross-sectional view of the sand rising water treatment apparatus 301 according to the second embodiment. The second embodiment is different from the first embodiment in that the screen 21 is inclined in the plate width direction with respect to the horizontal direction so that the stagnant dust 201 falls down on the surface of the screen 21. It is In addition, a discharge port 302 is also connected to the screen storage unit 22 for the dust 201 falling down on the surface of the screen 21 to fall and be discharged out of the sand rising water treatment apparatus 301. Therefore, the above-described dust outlet 23 and the open / close door 24 are not provided.

According to the second embodiment, it is possible to omit the work of manually removing the dust 201 from the inside of the pumped sand processing apparatus 301 using the rake 25 or the like as in the first embodiment.
Further, as in the first embodiment, by appropriately adjusting the water area load, the waste water 201 passes the clean 21 by passing the running water trough 11 before reaching the screen 21 and removing the momentum of the sand rising water 202 to some extent. It is possible to suppress the possibility of

In addition, due to the above-mentioned appropriate adjustment of water area load, floating waste 201 a that may float at least near the water surface among the waste 201 and sediment settling 203 (including partially deposited waste) flow down the zone on the screen 21. Divide. That is, in FIG. 2, the floating dust 201a flows down to the zone 21a on the screen 21, and the sediment settling 203 flows down to the zone 21b. As a result, it is possible to prevent the floating dust 201a from disturbing at least the passage of the sediment 203 through the screen 21 as in the first embodiment.
Moreover, in the case of the second embodiment, since both the floating waste 201a and the settling waste 201b separated by the screen 21 fall down quickly on the surface of the screen 21 and are easily discharged to the outside of the sand rising water treatment apparatus 301, the waste The degree to which 201 inhibits the passage of the sediments 203 through the screen 21 is further reduced.

Modification of Embodiment 2
FIG. 13 is a longitudinal sectional view of a sand rising water treatment apparatus 301a according to a modification of the second embodiment. The present modification is different from the second embodiment in that a buffer tank 71 is provided as in the first modification of the first embodiment. The configurations and operations of the respective members of the buffer tank 71 are the same as those of the modification of the first embodiment, and thus the detailed description will be omitted.
According to this modification, in the second embodiment, the same function and effect as those described in the modification of the first embodiment can be obtained.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for part of the configuration of each embodiment.

1, 1a, 301, 301a sand and sand treatment equipment 11 running water trough
21 Screen 31 Sand washing device (or sedimentation separation device)
71 buffer tank 101 settling basin 123 pumping pump 201 waste 201a floating waste, waste 201b settling waste, waste 202 dumping water

Claims (12)

A sand treatment apparatus for treating sand rising water containing sand and debris collected by a sand rising pump from a sedimentation basin, comprising:
A flowing water trough through which the sand rising water flows;
A screen disposed downstream of the flowing water trough for blocking and removing the refuse from the sand rising water;
1. A sand rising water treatment apparatus comprising: a sediment settling washing apparatus for removing fine soil and removing water from the sand rising water passing through the screen; or a sediment settling separation apparatus for separating sediments. The raised sand water according to claim 1, wherein the flowing water trough has a water area load of greater than 0 m ³ / (m ² · d) at a water area load of at most 1800 m ³ / (m ² · d). Processing unit. The raised sand processing apparatus according to claim 2, wherein the flowing water trough has a water area load of 1800 m ³ / (m ² · d) to 700 m ³ / (m ² · d). .   The said flowing-water trough is 3 m-8 m in length, The sand rising water treatment apparatus of Claim 2 or Claim 3 characterized by the above-mentioned.   5. The screen according to any one of claims 1 to 4, wherein the screen is inclined with respect to the horizontal direction in the plate width direction so that the stagnated dust falls down on the surface thereof. Sand water treatment apparatus according to any one of the preceding claims.   The upstream side of the flowing water trough is provided with a buffer tank for adjusting the flow rate and flow velocity of the sand rising water flowing into the flowing water trough to be a certain level or less. The sand rising water treatment apparatus as described in any one of 5. A method of treating sand discharge water, comprising treating sediment sand and refuse collected by a sand discharge pump from a sediment settling tank, comprising:
A first step of flowing the sand rising water into the running water trough;
A second step of blocking and removing the refuse from the sand rising water with a screen disposed downstream of the flowing water trough;
Sand-removing water comprising a third step of removing fine soil and removing water from the sand rising water passing through the screen by a sand settling washing apparatus or separating sediments by a sand settling separating device Processing method. The running water trough used in the first step is characterized in that the water area load is a length which is greater than 0 m ³ / (m ² · d) at a water area load of at most 1800 m ³ / (m ² · d). The method of treating sand rising water as described in. The water flow trough used in the first step has a water area load of 1,800 m ³ / (m ² · d) to 700 m ³ / (m ² · d). Water treatment method of sand.   The method according to claim 8 or 9, wherein the flowing water trough used in the first step has a length of 3 m to 8 m.   The running water trough used in the first step is characterized in that the stagnated waste is made to fall down on the surface by the plate width direction being inclined with respect to the horizontal direction. The method for treating sand rising water according to any one of 7 to 10.   8. The method according to claim 7, further comprising a fourth step of adjusting a flow rate and a flow rate of the sand rising water flowing into the flowing water trough to be equal to or less than a predetermined value by a buffer tank provided upstream of the flowing water trough. The method for treating sand rising water according to any one of claims 1 to 11.

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