JP2870689B2 - Apparatus and method for treating sediment, apparatus and method for purifying water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for treating sediment, in which sediment deposited on the bottom of a given body of water, such as waterways, canals, rivers, ponds, lakes, dams, etc., is carried out from the bottom and treated. Things. The present invention also relates to a water purification device useful as a part of the sediment treatment apparatus and a water purification method useful as a part of the sediment treatment method.

[0002]

2. Description of the Related Art In recent years, sewage and sludge such as domestic wastewater that have flowed into a river tend to decrease with the improvement of sewerage and environmental improvement. However, sludge-like soil (sedimentary soil) that has been deposited for many years still remains on the riverbed. This sediment degrades the aesthetics of the river and produces an unpleasant odor, so it is desired to remove it from the riverbed.

[0003] The sedimentary soil is sediment and sludge containing much water. In order to treat this, a part of the river was dammed with sheet piles or sandbags to divide the removal area, and the sediment in the removal area was scooped out of the river by mechanical force.

[0004]

However, when scooping from the bottom of a river, it is inevitable that water is mixed. For this reason, most of the sediment carried out from the river is in a liquid state and contains a huge amount of water. In order to treat this, the water-liquid sedimentary soil containing a large amount of water must be loaded on a vacuum truck or tank truck, transported to a treatment plant for disposal, and there has been a problem that the transportation cost increases.
Also, the sediment to be treated contains a large amount of water,
There is a problem that the amount of the soil improvement material used in the treatment plant increases, and the treatment itself requires a large amount of cost.

[0005] Further, after scooping the sedimentary soil from the bottom of the river, a large amount of turbid water is generated in the river. In other words, sedimentary soil can be scooped up to some extent for solid content,
It is difficult to scoop up part of the liquefied part and it is inevitable that it will remain in the river. This turbid water can also be pumped out of the removal area and transported to a turbid water treatment plant for treatment, but it requires considerable time and cost.

The present invention has been made in view of the above-mentioned problems, and is capable of efficiently treating water-liquid sediment that is installed close to a river or the like and scooped up from the river or the like. It is an object of the present invention to provide an apparatus and method for treating sedimentary soil that can also treat turbid water left in rivers and the like, and a water purification apparatus and method particularly useful for treating turbid water left in rivers and the like.

[0007]

According to a first aspect of the present invention, there is provided a sediment treatment apparatus for treating sediment deposited on a water bottom in a water area, wherein a removal area is defined in the water area. A blocking wall to be transported, and transporting means for transporting the sediment in the removal area to a processing area set outside the removal area,
Draining means provided in the treatment area for separating water from the conveyed sediment; and soil improvement means provided in the treatment area and performing soil improvement treatment on the sediment treated by the water removal means. doing.

According to a second aspect of the present invention, there is provided an apparatus for treating sedimentary soil according to the first aspect, further comprising a purifying means for purifying water separated from the sedimentary soil by the draining means. Features.

According to a third aspect of the present invention, there is provided the apparatus for treating sedimentary soil according to the first aspect, wherein the barrier walls are connected to each other to form a plurality of hollow boxes. , Wherein the box has a water port that can be opened and closed.

According to a fourth aspect of the present invention, there is provided the apparatus for treating sedimentary soil according to the first aspect, wherein the conveying means includes a hopper to which the sedimentary soil collected in the removal area is put. And a pump for pumping the sediment loaded into the hopper.

According to a fifth aspect of the present invention, there is provided an apparatus for treating sediment according to the first aspect, wherein the draining means includes a water-permeable screen and a turbid water provided below the screen. And a receiving tank.

According to a sixth aspect of the present invention, there is provided the apparatus for treating sedimentary soil according to the first aspect, wherein the soil improvement means includes a means for transferring the sedimentary soil, and a polymer-based material for the sedimentary soil. And a means for feeding a cement-based soil conditioner to the sedimentary soil.

According to a seventh aspect of the present invention, there is provided the apparatus for treating sedimentary soil according to the second aspect, wherein the purification means is a water-permeable partition member for filtering water separated from the sedimentary soil. It is characterized by having.

The method for treating sediment according to claim 8 is a method for treating sediment deposited on the bottom of water in a water area, wherein the dividing step defines a removal area in the water area. A pumping step of pumping the sedimentary soil in the removal area to a treatment area set outside the removal area, and a soil improvement step of performing a soil improvement treatment on the sedimentary soil after separating moisture from the sedimentary soil in the treatment area. Have.

According to a ninth aspect of the present invention, there is provided a method for treating sedimentary soil according to the eighth aspect, further comprising a purification step for purifying moisture separated from the sedimentary soil.

According to a tenth aspect of the present invention, there is provided the method for treating sedimentary soil according to the eighth aspect, wherein a water level in the removal area is kept lower than a water level in a water area other than the removal area. It is characterized by:

The method for treating sedimentary soil according to claim 11 is the method for treating sedimentary soil according to claim 8, wherein the sedimentary soil is a sedimentary soil having a low viscosity and a large amount of sand. A viscous auxiliary material is mixed with the sedimentary soil.

According to a twelfth aspect of the present invention, there is provided the method for treating sedimentary soil according to the eighth aspect of the present invention, wherein the sedimentary soil comprises a polymer-based soil improving material and a cement-based soil. It is characterized by mixing an improving material.

According to a thirteenth aspect of the present invention, there is provided a method of treating a sedimentary soil according to the ninth aspect, wherein the water separated from the sedimentary soil in the soil improvement step is removed in the purification step. The soil water sedimentation material is mixed with water in the removal area and stirred to separate the supernatant water and soil particle floc, and the supernatant water is moved by moving the water-permeable partition member in the removal area. It is characterized by accumulating soil particle flocs by passing through.

[0020] The water purifying apparatus according to claim 14, wherein the turbid water to be treated is stored, a water-permeable partition member movably provided in the region, and soil particles are contained in the turbid water in the region. A means for separating the supernatant water and the soil particle flocks by mixing and stirring the settling material; and a means for moving the water permeable partition member within the region to accumulate the soil particle flocs through the supernatant water. And

According to a fifteenth aspect of the present invention, the turbid water to be treated is stored in an area where the movable permeable partition member is provided, and the turbid water is mixed with a soil particle sedimentation material and stirred. And separating the supernatant water and the soil particle flocks, and moving the water-permeable partition member in the region to allow the supernatant water to pass through to collect soil particle flocs.

[0022]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. This example relates to an apparatus and a method for treating sediment in river 1. As shown in FIGS. 1 and 2, blocking walls 2 and 2 are respectively installed along the direction perpendicular to the flow at two locations upstream and downstream of the river 1 indicated by arrows. A sediment removal area 3 is defined between the areas 2 and 2. In this example, the sediment 4 inside the removal area 3 is carried out of the removal area 3 for processing.

The blocking wall 2 is composed of a plurality of hollow boxes which can be connected to each other to form a wall. There are three types of boxes in this example. The box body 5 shown in FIG. 3 is a rectangular parallelepiped box whose upper surface is open, and has a water port 6 on the bottom plate. On two short sides of the box, there are connecting flanges 7 and 8 for connecting with the adjacent box 5. On the bottom surface of the box 5, there is a frame-shaped projection 9 for obtaining stability when installed on a riverbed.

The water passage box 10 shown in FIG. 4 is substantially the same as that of FIG. 3, but has a water passage pipe 11 penetrating through two long side surfaces. The water-permeable box body 10 is provided at least one at each of two barrier walls 2, 2 that block the river 1.
Are connected by another long water passage 12.
Thereby, the upstream and downstream of the river 1 interrupted across the removal area 3 can be communicated, and the upstream water can be guided downstream without flowing into the removal area 3. Depending on the amount of water in the river 1 and the like, two or more water passage boxes 10 may be provided for each of the blocking walls 2 so that two or more water passage pipes 12 communicate with each other.

The end boxes 13 shown in FIG. 5 are provided on both sides of the blocking wall 2 that blocks the river 1. The shape of the revetment 1a of the river 1 is not constant. Seawall 1a of river 1 where construction is to be performed
The end box 13 having a shape conforming to the above shape is constructed and used. The end box 13 of this example has a pair of substantially triangular side walls 14 and 14 that match the slope of the revetment la, a wall 15 on the river 1 side, and the connecting flange 7. There is no wall on the slope side of the revetment 1a. At the time of use, it is packed with a water-blocking material such as a sandbag, so that such strength is required.

As shown in FIG. 6 (a), when the blocking wall 2 is installed in the river 1, an installation recess 1b is formed in the river bed.
As shown in FIG. 6B, the box 5 (and the water-passing box 10 not shown) is lowered into water. As shown in FIG. 6 (c), the box body 5 is immersed in the water and is installed in the installation recess 1b while allowing water to enter therein through the water inlet / outlet 6. When the water level in the box 5 coincides with the river 1, as shown in FIGS. 6C and 6D, the water inlet / outlet 6 is covered with a cylindrical lid 16.

As shown in FIG. 7, the box 5 and the water box 10
Are installed in the river 1 while being connected by the connecting flanges 7 and 8 as described above, and end boxes 13 are provided at both ends in contact with the seawall 1a.
Connect and install. The sandbag 17 as a water-blocking material is filled into the inside of the end box 13 and the connection flanges 7 and 8 of the box 5 and the water-passing box 10 to complete the blocking wall 2. As shown in FIGS. 1 and 2, the water pipe 11 of the water box 10 of the two blocking walls 2 that defines the removal area 3 is a separate long water pipe 1.
Connect with 2.

In this embodiment, an appropriate position on the shore of the river 1 outside the removal area 3, specifically, near the removal area 3 is used as a treatment area for treating the sediment 4 transported from the river 1. I do. In this treatment area, the soil improvement plant 20
Is installed. This soil improvement plant 20 includes a floor plate 21
Various processing devices are installed on a work gantry 23 that supports the cradle 22 with a support 22. The work gantry 23 has a height suitable for loading on a transport vehicle 24 (a dump truck or the like) that carries out the processed earth and sand.

On the loading side of the work gantry 23, a draining means 25 for separating water from the sediment 4 transported from the removal area 3 is installed. The draining means 25 has a water-permeable screen 26 and a turbid water receiving tank 27 provided below the screen 26. The screen 26 may be a mesh member or a filter having a relatively coarse mesh. The draining means 25 has an inclined structure in which the receiving side is high and the discharging side is low. As the received sedimentary soil 4 flows along the slope, the water in the sedimentary soil 4 is separated by the screen 26 and falls into the turbid water receiving tank 27 below.
A turbid water return pipe 28 is connected to the turbid water receiving tank 27.
The discharge side of the turbid water return pipe 28 is installed in the removal area 3, and turbid water that has flowed out of the sedimentary soil 4 is returned to the removal area 3. When the removal area 3 and the turbid water receiving tank 27 are separated, the turbid water is returned using a pump.

On the discharge side of the draining means 25, a soil improving means 30 for continuously performing soil improving processing on the sedimentary soil 4 treated by the water removing means 25 is provided. First, on the discharge side of the draining means 25, a hopper 31 for receiving the discharged sediment 4 is provided. Above the hopper 31,
A first improving material addition device 32 for charging a polymer-based soil improving material to the sedimentary soil 4 is provided. The soil improving material added to the sedimentary soil 4 by the improving material adding device 32 is a polymer-based flocculant which forms an insoluble strong gel and separates from water. A completely non-sticky floc is formed in the form of wrapping a suspended substance in an insoluble gel. Various polymer-based flocculants having the same function can also be used.

The outlet of the hopper 31 is connected to an inlet of a stirring screw 33 which is a means for transferring the sedimentary soil 4. The stirring screw 33 has a cylindrical housing and a screw driven by a drive motor inside the housing, and conveys the deposited sediment 4 while stirring. Although not shown, a second improving material adding device is provided in the middle of the stirring screw 33 for feeding a cement-based soil improving material into the sedimentary soil 4. The discharge port of the stirring screw 33 is located at the end of the work gantry 23, and the processed sediment 4 is dropped and loaded on the carrier of the transport vehicle 24 stopped below the work gantry 23. .

As shown in FIGS. 1 and 2, in the removal area 3 of the river 1, a pressure feeder 40 is provided as a transport means for transporting the sediment 4 to the soil improvement plant 20 in the processing area. The pumping device 40 includes a hopper 41 into which the sedimentary soil 4 collected in the removal area 3 is put, a pumping pump 42 to feed the sedimentary soil 4 into the hopper 41, and a gantry 43 on which these are loaded. Have. Pressure pump 42
For example, a squeeze pump, a parallel sliding pump, or the like can be used. The tip of the transport pipe 44 connected to the discharge port of the pressure pump 42 is located at the upper end of the draining means 25 of the soil improvement plant 20. As a means for transporting the sedimentary soil, a pumping device 4 having a pumping pump 42 is used.
In addition to 0, a conveyor such as a screw conveyor or a belt conveyor that rotates an auger screw in a pipe may be used, or a sedimentary soil may be transported from a removal area using a crane and a sand bucket and supplied directly to the draining means 25. It may be appropriately selected according to the construction conditions, such as the properties of the deposited soil to be conveyed.

As shown in FIG. 1 and FIG. 2, in the removal area 3 of the river 1, the sediment 4 in the removal area 3 is fed by a pumping device 40.
A hydraulic excavator 50 is disposed as a transportation means for transporting the hopper 41 into the hopper 41. When the sediment 4 in the removal area 3 is hard to some extent, a hydraulic shovel can be mounted on the sediment 4 as in this example to perform the operation. If the sedimentary soil 4 in the removal area 3 is too soft to enter, the work may be performed by placing a clamshell or the like having a boom of an appropriate length on the shore.

The apparatus for treating the sedimentary soil 4 in this embodiment is configured to remove moisture from the sedimentary soil 4 and treat it with a soil improvement material, and return the turbid water extracted from the sedimentary soil 4 to the removal area 3 of the river 1. . Therefore, a purifying means for purifying the muddy water returned to the removal area 3 is provided. As shown in FIG. 8, a water-permeable wall body 60 as a water-permeable partition member is provided along the entire width of one shielding wall in the removal area 3 as a purification unit.
As shown in FIG. 9, the water permeable wall 60 is formed by connecting a plate-like fiber mat to a required length. In this example, the water permeable wall 60 substantially corresponds to the width of the river or the length of the barrier wall 2. Is set to A rod-shaped weight 61 is fixed to a lower edge of the water-permeable wall body 60 by a fixing tool 62 so as to be independent underwater. The pulling rope 63 for movement is connected to the weight 61, and by pulling the pulling rope 63, the water-permeable wall body 60 can be moved in water as shown in FIG.

A method of treating the sedimentary soil 4 using the processing apparatus described above will be described. According to the above-described procedure, the removal wall 3 is set by installing the blocking wall 2 at the target position of the target river 1. The box 5 and the water box 10 constituting the blocking wall 2 are light, easy to handle, and easy to work when water is not contained. If the blocking wall 2 is constructed by overlapping, it can cope with a place having a deep water. Because it is box-shaped, its self-sustaining state is stable. It is easy to assemble and disassemble, and has the effect of quick work.

The excavated soil 4 in the removal area 3 is removed from the excavator 5
The hopper 41 of the pressure feeding device 40 in the removal area 3 is scooped with 0 or the like. Since the hydraulic excavator 50 also scoops up water together with the sedimentary soil 4, the sedimentary soil 4 charged into the hopper 41 contains a large amount of water and is in a liquid state.
The liquid sediment 4 is efficiently pumped by the pump 42 of the pumping device 40 and discharged to the upper end of the draining means 25 of the soil improvement plant 20. Because it is transported by pump,
Even if the removal area 3 and the soil improvement plant 20 are far from each other, a transportation problem hardly occurs. Since the installation location of the soil improvement plant 20 has a degree of freedom, an optimum location can be selected in consideration of environmental issues and the like.

In the case where low-viscosity sedimentary soil, for example, sedimentary soil 4 with a large amount of sand is pumped, if the auxiliary viscous material is put into the hopper 41 together with the sedimentary soil 4 and mixed, the pressure-feeding can be performed without any trouble. is there. As the viscosity auxiliary material, for example, clay,
A cement-based viscosity aid, a polymer-based viscosity aid, and the like can be used.

During the removal operation of the sedimentary soil 4, the removal area 3
The internal water level is the same as or lower than the downstream water level to prevent turbid water from flowing downstream. In order to adjust the water level in the removal area 3, the supernatant water in the removal area 3 may be discharged downstream by a pump.

When the operation is suspended, the water blocking material (sandbag 17) at the connection portion of the downstream shielding wall 2 is partially removed so that water can flow, and the supernatant water in the removal area 3 flows downstream. Then, the water level in the removal area 3 is naturally set to be the same as the downstream water level.

The sediment 4 discharged on the draining means 25
The water is separated by the screen 26 while flowing to the lower discharge side. The separated water enters the turbid water receiving tank 27,
It is returned into the removal area 3 by the turbid water return pipe 28. The roughly dewatered sedimentary soil 4 is added with a polymer-based soil improver from a first improving material adding device 32 in a hopper 31, and is fed into a stirring screw 33. The sediment 4 is added with a cement-based soil conditioner while being stirred by the stirring screw 33, and is conveyed. The addition amount of the soil improvement agent of the polymer system is determined depending on the moisture conditions of the sediment 4, for example in the case of a water content ratio 50% to 100% of the sediment is a 1 m ³ per 1kg~2kg about, soil cementitious About 50 kg to 150 kg per 1 m ^{3 of the} improving agent.

According to the present embodiment, the polymer-based soil conditioner wraps the water between the soil particles to reduce the suspended water, and then the cement-based soil conditioner reacts with the suspended water to deposit the soil 4. To high quality soil. The sediment soil 4 improved in this way is
After about one week, a strength of about 1-3 kgf / cm ² can be obtained, and it can be used for landfill and embankment. In addition, cement-based soil conditioners may be added in order to obtain higher strength, and if they are forcibly packed and cured by another means, they can be used as landfill materials that do not elute in water, or as a revetment method. It can be used as a discard stone for face holding.

As in this example, when a cement-based soil conditioner is mixed with the sedimentary soil 4, ammonia gas may be generated. In the process of this example, in the process of stirring the sedimentary soil 4 mixed with the cement-based soil conditioner with the stirring screw 33, ammonia gas may be generated and may come out of the outlet of the stirring screw 33. In that case, the stirring screw 33
Water is atomized by a water spray device provided near the outlet of the above, and is injected into ammonia gas. Ammonia dissolves in the injected water and becomes water droplets of the ammonia water. These may be collected, stored in a predetermined position, neutralized and rendered harmless.

The treated sediment 4 discharged from the agitating screw 33 is put into the carrier of the transport vehicle 24 parked at a predetermined position below the work gantry 23, and is carried out of the work area. The steps described above, that is, the pressure feeding, the dehydration, the turbid water discharge, the soil improvement treatment, and the unloading of the sedimentary soil 4 from the removal area 3 are continuously performed. During the work, removal area 3
There is no pollution such as turbidity in the water area of the river 1 other than.

When the treatment of the sedimentary soil 4 in the removal area 3 is completed, the treatment of the turbid water accumulated in the removal area 3 is performed. As shown in FIG. 8A, the water-permeable wall body 60 is at a position in contact with the downstream-side blocking wall 2a. A soil particle sedimentation agent is mixed with the turbid water in the removal area 3, and the soil particles suspended in the turbid water and the soil particle sedimentation agent are integrated to form flocs of the soil particles and settle. The soil particle sedimentation agent may be a solution type or a powder type. The mixing of the turbid water and the soil particle sedimentation agent is performed by generating a water flow with a stirring pump.

As shown in FIGS. 8B and 10, the traction rope 63 is pulled to move the water-permeable wall 60 toward the other blocking wall 2b. The settled soil particle flocs are collected in the direction of movement of the permeable wall 60, and the supernatant water passes in the direction opposite to the direction of movement of the permeable wall 60.

As shown in FIG. 8C, the water permeable wall 60
Reaches the vicinity of the blocking wall 2b on the opposite side, the collected flocs of soil particles are collected by a mud pump 64 or the like, dewatered, and finally disposed. The final disposal may be a soil improvement treatment or a turbid water treatment plant. Soil particle flocks made of soil particle agglomerates are not easily destroyed, and when squeezed out with a cloth, they become okara-like, and can be used as landfill, embankment, and horticultural soil, so dispose of them as industrial waste. No need.

According to the apparatus and method for treating sediment described above, continuous work can be performed without causing any turbidity in the water area other than the partitioned removal area 3. In addition, the equipment is small-scale and the sedimentary soil 4 is pumped, so that there is no problem even if the soil improvement plant 20 and the removal area 3 are separated.

In particular, in the final step of purifying turbid water, the removal area 3 itself is used as a sedimentation tank, and flocs of soil particles are filtered by the permeable wall 60 before final disposal, so that the amount of water to be treated is small. It has the advantage of ending. If the turbid water in the removal area 3 is pumped up, transported to the turbid water treatment plant, and then disposed of, water flows into the removal area from the surroundings, thereby increasing the processing volume. However, since this example minimizes the final disposal amount, there is no such waste.

A second example of the embodiment of the present invention will be described with reference to FIGS. In this example, the sedimentary soil 4
13 shows a modification of the final step of purifying turbid water in the processing apparatus and method. When the water depth in the removal area 3 is relatively deep, a water-permeable cloth 70 as shown in FIG. 11 is used as the water-permeable partition member instead of the plate-shaped water-permeable wall 60 as in the above example. convenient. The water-permeable cloth 70 is a fiber capable of separating the flocs of soil particles from the supernatant water. The weight 71 is provided at the lower edge, and the float 72 is provided near the upper edge.

As shown in FIG. 12A, the water-permeable cloth 70
Are arranged along the maximum inner circumference of the removal area 3 divided by the shielding walls 2a and 2b. Turbid water generated in the removing step of the sedimentary soil 4 accumulates inside the water-permeable cloth 70 arranged in a circumferential shape.

As shown in FIG. 12 (b), in the purification step, the soil particle sedimentation agent is mixed into the turbid water in the same procedure as in the above-described example, and the soil particles suspended in the turbid water and the soil particle sedimentation agent are mixed. To form flocs 73 of soil particles and settle.

As shown in FIG. 12 (c), after the precipitation is completed, the water-permeable cloth 70 is collected at one corner in the removal area 3, and the flocs 73 of the soil particles and the supernatant water are roughly separated. The subsequent procedure is the same as in the first example.

Each of the examples described above relates to the treatment of sediment in a river. However, with substantially the same configuration, the sediment deposited on the bottom of a certain body of water, such as a channel, a canal, a pond, a lake, a marsh, or a dam. Can also be applied to the work of transporting and processing wastewater from the bottom.

In addition, the process of purifying turbid water discharged from the sedimentary soil is as follows:
It can be widely applied to not only sediment treatment but also general turbid water treatment.

[0055]

According to the apparatus and method for treating sedimentary soil according to the present invention, the sedimentary soil is pumped from the removal area defined in the water area, and after the water is drained, the soil improvement treatment is performed. There is an advantage that efficient work can be continuously performed without flowing turbid water, a high quality improved soil can be obtained, and the degree of freedom of location of a work plant is high.

According to the water purification apparatus and method according to the present invention, the soil particle sedimentation material is mixed with the turbid water collected in the predetermined area to settle the earth particle flocs, and the soil permeable partition member is moved in the water to move the soil particles. Separates the particle floc from the supernatant water,
Efficient and economical turbid water treatment can be performed with a minimum treatment volume. In particular, when applied to the apparatus and method for treating sedimentary soil according to the present invention, the effects of the present invention can be further improved, and excellent sedimentary soil treatment work including turbid water treatment can be completed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first example of an embodiment of the present invention.

FIG. 2 is a sectional view showing a first example of an embodiment of the present invention.

FIG. 3 is a view showing a box constituting a shielding wall in the first example of the embodiment of the present invention.

FIG. 4 is a diagram showing a water-flow box constituting a shielding wall in the first example of the embodiment of the present invention.

FIG. 5 is a diagram showing an end box constituting a shielding wall in the first example of the embodiment of the present invention.

FIG. 6 is a diagram showing a procedure for forming a shielding wall in the first example of the embodiment of the present invention.

FIG. 7 is a diagram illustrating a shielding wall according to a first example of an embodiment of the present invention.

FIG. 8 is a diagram showing a water purification step in a first example of an embodiment of the present invention.

FIG. 9 is a perspective view showing a water-permeable wall in the first example of the embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a water purification step in the first example of the embodiment of the present invention.

FIG. 11 is a perspective view showing a water-permeable cloth according to a second example of the embodiment of the present invention.

FIG. 12 is a diagram showing a water purification step in a second example of the embodiment of the present invention.

[Explanation of symbols]

2, 2a, 2b Blocking wall 3 Removal area 4 Sedimentary soil 5 Box 10 Water-permeable box 13 End box 25 Drainage means 26 Screen 27 Turbid water receiving tank 30 Soil improvement means 32 Soil improvement means 32 1 Improvement material adding device 33 Stirring screw as transfer means 40 Pumping device as transfer means 41 Hopper 42 Pumping pump 60 Water permeable wall as water permeable partition member as purification means 70 Water permeable partition member as purification means Permeable cloth

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 591098938 Numata Construction Co., Ltd. 1780-1 Torigoe, Shinjyo-shi, Yamagata Prefecture (73) Patent holder 596143277 Union Hume Tube Co., Ltd. 2-3-112 Kaminarimon, Taito-ku, Tokyo (72) Inventor Katsukuni Ashino 3-1-2 Takada, Chigasaki City, Kanagawa Prefecture 1190 Sugata-cho Shibuya Construction Co., Ltd. (72) Inventor Shuichi Ishikawa 2-4-1 Kaji-cho, Chiyoda-ku, Tokyo Nitto Construction Co., Ltd. 72) Inventor Minoru Onda 2-3-112 Kaminarimon, Taito-ku, Tokyo Inside Union Hume Co., Ltd. (56) References JP-A-8-246495 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02F 3/88 B09B 3/00 C02F 11/00

Claims (15)

(57) [Claims] 1. A sediment treatment apparatus for treating sediment deposited on a water bottom in a water area, comprising: a blocking wall defining a removal area in the water area; and a removal area in a treatment area set outside the removal area. Transport means for transporting sediment in the vessel, draining means provided in the processing area to separate water from the transported sediment, and sediment provided in the processing area and treated by the draining means. And a soil improvement means for performing soil improvement processing. 2. An apparatus for treating sediment according to claim 1, further comprising a purifying means for purifying water separated from said sediment by said draining means. 3. The sedimentary soil according to claim 1, wherein the blocking wall is composed of a plurality of hollow boxes that can be connected to each other to form a wall, and the box has a water port that can be opened and closed. Processing equipment. 4. The pumping device according to claim 1, wherein the transporting means includes a hopper into which the sedimentary soil collected in the removal area is charged, and a pumping pump for pumping the sedimentary soil into the hopper. 2. An apparatus for treating sediment according to claim 1. 5. The apparatus for treating sediment according to claim 1, wherein said draining means has a water-permeable screen and a turbid water receiving tank provided below the screen. 6. The soil improving means includes means for transferring the sedimentary soil, means for charging a polymer-based soil improving material to the sedimentary soil, and means for charging a cement-based soil improving material to the sedimentary soil. The apparatus for treating sediment according to claim 1, comprising: 7. The apparatus for treating sediment according to claim 2, wherein said purifying means is a water-permeable partition member for filtering water separated from said sediment. 8. A method for treating sedimentary soil deposited on a water bottom in a water area, comprising: a partitioning step of defining a removal area in the water area; and a removal area in a treatment area set outside the removal area. A method for treating sedimentary soil, comprising: a pumping step of transporting sedimentary soil therein; and a soil improvement step of subjecting the sedimentary soil to a soil improvement treatment after separating water from the sedimentary soil in the treatment area. 9. The method for treating sedimentary soil according to claim 8, further comprising a purification step of purifying water separated from the sedimentary soil. 10. The method for treating sediment according to claim 8, wherein a water level in the removal area is kept lower than a water level in a water area other than the removal area. 11. The method for treating sedimentary soil according to claim 8, wherein the sedimentary soil is a sedimentary soil having a low viscosity and a high sand content, and a viscous auxiliary material is mixed with the sedimentary soil in the pumping step. 12. The method for treating a sedimentary soil according to claim 8, wherein in the soil improvement step, a polymer-based soil improver and a cement-based soil improver are mixed into the sedimentary soil. 13. In the purification step, the water separated from the sedimentary soil in the soil improvement step is returned to the removal area, and the water in the removal area is mixed with a soil particle sedimentation material and stirred. The method for treating sediment according to claim 9, wherein the sediment is separated into supernatant water and soil particle flock, and soil particle flock is accumulated by passing the supernatant water by moving a water-permeable partition member in the removal area. 14. An area where turbid water to be treated is stored,
A permeable partition member movably provided in the region, means for separating the supernatant water and the soil particle floc by mixing and stirring the soil particle sedimentation material in the turbid water in the region, and the supernatant water Means for moving said water permeable partition member within said area to accumulate soil particle flocs by passing therethrough. 15. A turbid water to be treated is stored in an area provided with a movable permeable partition member, and a soil particle sedimentation material is mixed with the turbid water and stirred to separate supernatant water and soil particle floc. A water purification method for moving the permeable partition member in the region to allow the supernatant water to pass through and accumulate soil particle flocs.