JP2002355663A - Soil cleaning system with high pressure jet and method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove pollutants at an extremely low cost, with efficiency and in a short period of time because the pollutants stuck into soil can be removed by making a highly concentrated polluted-soil collide with a driven high pressure water in the course of sucking the highly concentrated polluted-soil from the ground by a gas mixed jet pump and sending it by pressure in a pipe. SOLUTION: The system is provided with a pressure-feed and cleaning device 12 where the pollutants stuck to earth and sand particles are separated and cleaned by making the three phases of gas, liquid and solid collide with each other by making the driven high pressure water collide with the polluted soil in the course of sucking the polluted soil from one end of the pipe 11 by using the gas mixed jet pump 10 and transporting the sucked polluted soil through the pipe 11, the first precipitation vessel 17 for solid-liquid separation which is composed of a water vessel filled with a cleaning water, receiving waste water containing the earth and sand cleaned by the device 12, and making the earth and sand precipitate, the second precipitation vessel 20 for solid-liquid separation which receives an overflow water from the first precipitation vessel, a sand filter 25 receiving the overflow water from the second precipitation vessel and filtering it by sand filter medium, and a circulation-water receiving vessel 30 receiving the water filtered by the sand filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure jet soil cleaning system and a cleaning method using an air-mixing jet pump, and more particularly to a low-cost and low-concentration soil irrespective of a deep layer, a shallow layer, or a high-concentration or low-concentration contamination. The present invention relates to a high-pressure jet soil cleaning system and a cleaning method for efficiently collecting and purifying contaminated soil and returning the soil to soil again.

[0002]

2. Description of the Related Art In recent years, volatile organic compounds (eg, trichloroethylene,
Benzene, tetrachloroethylene, etc.) and petroleum hydrocarbons have become a problem, and these pollutants are decomposed over time by certain bacteria (microorganisms) living in the soil, rendering them harmless (bioremediation). However, the highly contaminated soil can cause bacterial growth,
Due to the lack of oxygen essential for activities, it is difficult to clean up contaminated soil within a short period of time unless artificially supplying bacterial nutrients or redox agents to promote growth. However, even if measures are taken to artificially promote the growth of bacteria, it usually takes a long time of several years or more to sufficiently purify and detoxify the soil, It is hard to say that it is a purification method that has sufficient purification efficiency to meet the needs.

Therefore, conventionally, as a countermeasure against soil contamination and groundwater contamination, a well point or a deep well is cast in a contaminated soil portion in the ground, and the groundwater level is reduced by pumping water through the well point or the like. On the other hand,
Various purification methods for injecting water from another place by the recharge method have been proposed. This purification method mainly focuses on, for example, pumping groundwater in contaminated soil via a well point, purifying the pumped groundwater with a purification facility on the ground, and returning the groundwater from another place to the ground. However, in highly contaminated soil, the gap between the soil particles is occupied by contaminants, and water and air (gas) cannot penetrate into the gap between the soil particles. For this reason, even if a well point or a deep well is cast and pumping and water injection work is performed, it is difficult to form a sufficient water path at the stratum boundary of the stratum, etc. It is difficult to form and promote osmotic circulation and remove many pollutants contained in soil. In particular, it is difficult to obtain satisfactory results by a purification method using a well point or the like in a soil having a low permeability, such as a silty soil. In other words, the conventional contaminated soil purification method
Since it was a simple method of casting a well point or deep well on the ground, pumping water, and then returning it to the ground, it was not possible to exert a sufficient purification effect, and poor purification of the soil was always a problem Had become. Therefore, redoing work, prolonging work, accumulating investment amounts, and the like have become problems. Further, in the conventional method of purifying the soil by the combination of the pumping and the water injection, it is difficult to repair the contaminated soil and the contaminated groundwater by tar and heavy metals. For this reason, as a method of purifying soil contaminated by tar and heavy metals, a soil replacement method of replacing contaminated soil with non-contaminated soil has been performed. This is a problem in terms of cost, equipment, construction period, and energy environment balance required for performing the method, and has a drawback of low practicality.

[0004] A sealing soil method is also known in which the outer periphery of the contaminated soil area is sealed with a water impervious wall. However, when this method is implemented, the contaminants remain permanently in the contaminated soil area, and land use is reduced. Is limited. The in-situ cleaning method is a method of injecting useful bacteria or chemicals into the contaminated soil and waiting for the elimination of the contamination, but has the disadvantage that the reliability is low and that much time is required to reduce the contamination. Have. It also has the disadvantage that the effect on tar and heavy metal contamination is not sufficient. Furthermore, the soil washing method is a method of excavating and taking out contaminated soil, throwing it into a rotating drum installed in a plant, performing a washing process, and then burying the soil in the ground. In order to treat soil efficiently, plant facilities must be large-scale, resulting in a high-cost, energy-intensive system, and are affected by location conditions such as land use restrictions. Not a target.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above, and has no need for a large-scale, high-cost, large-scale energy-consuming plant facility.
Not only soils contaminated with volatile organic compounds (eg, trichloroethylene, benzene, tetrachloroethylene, etc.), oil-based hydrocarbons and coal-based pollutants, but also soils highly contaminated with tar, heavy metals, etc. in a short period of time An object of the present invention is to provide a high-pressure jet soil cleaning system and a cleaning method that can be efficiently taken out, washed in the facility, and backfilled.

[0006]

According to a first aspect of the present invention, a contaminated soil is sucked from one end of a pipe using an air-mixing jet pump, and the sucked contaminated soil is passed through the pipe. A pressure-feed cleaning device for ejecting driving high-pressure water to the contaminated soil in the transporting process to collide three phases of gas, solid, and liquid to separate and clean contaminants attached to the soil particles, and a water tank filled with cleaning water A first sedimentation tank for solid-liquid separation for receiving wastewater containing sediment washed by the pressure-feed cleaning device and sedimenting the sediment, and a solid-liquid separation for receiving overflow water from the first sedimentation tank A second sedimentation tank, a sand filtration device for receiving the overflow water from the second sedimentation bath and filtering with a sand filter medium, and a circulating water receiving tank for receiving the water filtered by the sand filtration device; It is characterized by having. According to a second aspect of the present invention, in the first aspect, the water in the circulating water receiving tank is circulated and supplied to at least one of the pressure-feed cleaning device, the first sedimentation tank, or the second sedimentation tank. It is characterized by doing. The invention according to claim 3 is the invention according to claim 1 or 2, wherein the first settling tank,
Alternatively, there is provided a high-pressure jet sediment transport device for returning the washed sediment settled in the second settling tank to the ground.

According to a fourth aspect of the present invention, contaminated soil is sucked from one end of a pipe using an air-jet pump, and driving high-pressure water collides with the contaminated soil in the process of transporting the sucked contaminated soil through the pipe. Gas, solid, and three phases of liquids are caused to collide with each other to separate and contaminate the contaminants attached to the surface of the earth and sand particles. A first solid-liquid separation step of feeding the filled first sedimentation tank to sediment the earth and sand, and supplying overflow water from the first sedimentation tank to the second sedimentation tank to sediment the earth and sand A second solid-liquid separation step, a sand filtration step of receiving overflow water from the second sedimentation tank and filtering it with a sand filter medium, and a circulating use step of circulating and using the water filtered by the sand filter medium. It is characterized by having. The invention of claim 5 is a holding step of sucking and transporting the sediment separated in the first solid-liquid separation step in the first solid-liquid separation step and deposited in the first sedimentation tank by a high-pressure jet sediment transport device, and temporarily retaining the soil. The sediment once held in the holding step is sucked again from one end of the pipe using the air-jet pump, and the high-pressure water is caused to collide with the contaminated soil in the process of transporting the sucked contaminated soil through the pipe. Gas, solid,
A re-pressure cleaning step of separating and cleaning contaminants adhering to the surface of the earth and sand particles by colliding the three phases of liquid, and a first settling tank filled with cleaning water by re-cleaning the soil and sand by the pressure cleaning apparatus. And a second first solid-liquid separation step of supplying sediment to settle the earth and sand.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 is a facility diagram for implementing a high-pressure jet soil cleaning system and a cleaning method according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a method for implementing the system. The high pressure jet soil cleaning system 1 shown in FIG. 1 includes plant equipment 2 installed in a soil improvement section 3 containing contaminated soil. This plant equipment 2
The contaminated soil S is sucked from one end of the pipe 11 using the high-pressure jet device 10 composed of an air-mixing jet pump, and the contaminated soil S is jetted against the contaminated soil in the process of transporting the sucked contaminated soil S through the pipe. And a water tank 15 filled with cleaning water 16 by separating and washing contaminants adhering to earth and sand particles by colliding three phases of solid and liquid, and sediment washed by the pressure washing apparatus 12 A sediment receiving tank (primary sedimentation tank) 17 for receiving solid 13 and sedimenting sediment 13, a secondary sedimentation tank 20 for solid-liquid separation for receiving overflow water from the sediment receiving tank 17, Next sedimentation tank 2
A sand filtration device 25 for receiving the overflow water from 0 and filtering it with a sand filter medium 26, a circulating water receiving tank 30 for receiving the water filtered by the sand filtration device 25, and a sediment receiving tank 17
And a high-pressure jet sediment transporting device 31 for sucking the sediment deposited therein and temporarily retaining the sediment at a retaining position.

The pressure-feed cleaning device 12 sucks the contaminated soil S from one end of the tube 11 using a high-pressure jet device (air-mixing jet pump) 10 and contaminates the contaminated soil S in the process of being transported through the tube. This is a means for removing contaminants adhering to sediment particles by colliding three phases of gas, solid and liquid by colliding jet water with soil. As shown in FIG. 3, the high-pressure jet device 10 includes a bent portion (vent portion) in the middle of the pipe 11,
That is, the pressure water pipe 36 connected to the connection between the suction-side pipe 11a and the discharge-side pipe 11b that are bent and connected to each other.
And a gas (outside air) introduction pipe 37 communicating in the middle of the pressure water pipe 36, and a pressure water supply source 38 arranged upstream of the pressure water pipe 36 to supply high-pressure driving water into the pressure water pipe. Pressure water pipe 36 is axially driven high-pressure water on the discharge side of the tube 11b (e.g., (5~250kg / cm ²⁾ initial velocity v ₀ of the. Driving high-pressure water is connected to eject the 30
At 〜60 m / sec, a negative pressure is generated at the interface between the driving high-pressure water (jet water). Therefore, the driving high-pressure water fed from the pressure water supply source 38 is supplied to the nozzle 36 at the tip of the pressure water pipe 36.
a into the pipe 11b on the discharge side, the ejected driving high-pressure water is ejected by the gas ejector pipe 37b.
Atmosphere is sucked in from and becomes mixed pressure water,
The driving high-pressure water in the mixed state is jetted into the discharge side pipe 11b, so that the inside of the suction side pipe 11a is in a vacuum state and the soil is sucked up, and the suction side pipe 11a is discharged from the suction side pipe 11a. 11b. The suction and the pressure feeding are continuously performed as long as the ejection of the driving high-pressure water continues. At this time, the soil sucked up at the point O in the pipe 11 collides with the driving high-pressure water, and the collision of gas, solid, and liquid in a three-phase state is maintained. As a result of the collision in the three-phase state, the contaminants adhering to the earth and sand are separated or easily separated. The discharge-side tube 11b is configured so that at least its tip can swing.

Next, FIG. 4 shows a sediment receiving tank (primary sedimentation tank).
17 is a cross-sectional view illustrating a configuration example of the sediment receiving tank 17.
Comprises a water tank 15 filled with washing water (for example, fresh water such as tap water) 16, and the discharge pipe 11 is provided in the water tank 15.
Insert the outlet of b. The flat area of the water tank 15 is, for example, 3 × 12 = 36 m ² , and the effective water storage amount is about 100 m ³
And The discharge port of the discharge pipe 11b is arranged at a position near one end 15a of the water tank 15. From the discharge port of the discharge pipe 11b, the cleaning water (driving high-pressure water), cleaning soil, contaminants, and gas bubbles are discharged. The solid-liquid ratio between the discharged washing soil and the cleaning water is set to be about 1: 3 (25%), and the discharge amount is about 100 m ³ / H. At this time, of the earth and sand discharged from the pipe 11b, those having a large specific gravity settle in the water tank 15, while silts having a light specific gravity float in water to form turbid water. The pipe 11
The oil having a low specific gravity discharged from b is agitated and separated by aeration by air discharged at the same time, and floats on the water surface. The other end 15 away from the outlet of the tube 11b
An oil separator 41 is disposed at a position closer to b to prevent oil floating on the water 16 from moving to the second settling tank 17 at the next stage. The oil floating on the water 16 is removed by an oil adsorbing sheet (not shown), treatment with a surfactant, or any other removing means. The other end 15b of the water tank 15
Is configured to be lower than one end 15a where the discharge port of the discharge pipe 11b is arranged, or by providing a discharge hole, so that the amount of water corresponding to the discharge (inflow) from the discharge pipe 11b is closer to the other end 15b. It overflows to the outside and flows into the next secondary sedimentation tank 20. At this time, most of the sediment settles down in a state where the sediment is solid-liquid separated on the side of the sediment receiving tank 17, and the light-weighted viscosities and pollutants are discharged earlier along the flow of water. The silt content and volatile contaminants having intermediate specific gravities are partially settled in the water tank, partially retained, and partially discharged. A plurality of sediment receiving tanks 17 are prepared, and when the amount of settled sediment increases to a required amount, the tip of the discharge pipe 11b is moved to a new sediment receiving tank 17 disposed adjacent to newly discharge the sediment receiving tank 17. To start. Therefore, the cleaning operation can be performed continuously without interruption. Specifically, for one sediment receiving tank 17, the discharge pipe 1
After the discharge from 1b is continued, the process proceeds to another sediment receiving tank 17.

After the discharge from the discharge pipe 11b is stopped, 25 g of fresh water (circulating water, which will be described later) is supplied to the sediment receiving tank 17.
Water is supplied for about 30 minutes at about m ³ / H, and the contaminants that have migrated to the water side in the water tank 15 are drained to the next secondary sedimentation tank 20 without sedimentation as much as possible. If you stop water supply after 30 minutes,
The water level in the water tank 15 is gently lowered, and when the water level drops to half or less, the water is suctioned and pumped as high-concentration water to a soil rewashing line described later. At this time, if it is confirmed that the contamination concentration of the sediment 13 settled in the water tank 15 is sufficiently reduced, the high-pressure jet sediment transporting device 31 sucks the soil 13 and bury it in the original ground. . If the contamination concentration is not sufficiently reduced, the high-pressure jet sediment transporting device 31 sucks the soil 13, transports it to the holding position and deposits it, and then sucks and cleans the soil again using the high-pressure jet device 10. The discharge to the sediment receiving tank 17 is repeated. In addition,
As a position for temporarily storing the sucked earth and sand, a special storage tank may be provided by excavating the soil or the like, or a previously excavated contaminated soil ground (another place) may be used. May be.

Next, FIG. 5 is a sectional view showing a configuration example of the secondary sedimentation tank 20 and the sand filtration device 25. Secondary sedimentation tank 20
The sand filter 25 and the sand filtration device 25 may be configured separately, but by integrating them in this way, it is possible to reduce the size and increase the efficiency of continuous processing. The facilities 20 and 25 include a pit (drilled hole) 50 formed by excavating the ground adjacent to the sediment receiving tank 17 into a substantially conical (or cylindrical) shape from the ground surface, and An embankment 51 formed by embankment of excavated soil, a waterproof sheet 52 spread over the inner surface of the pit 50, and a hollow cylindrical casing 53 (height 3.5) erected and fixed at the center of the pit 50.
m), and the sand filter medium 26 (3.0 m in height) filled in the casing 53. The sand filter medium 26 is a sand filter 25
And a pit 50 located outside the casing 53.
The inside constitutes the secondary sedimentation tank 20. The secondary sedimentation tank 20 is filled with fresh water in advance. The pit 50 has, for example, an excavation depth of 2.0 m and a bottom diameter (R1) of 5.0 m. The embankment 51 is formed around the pit by using excavated soil, and is finally a sedimentation tank having a water tank surface diameter (R2) of about 15.0 m and a water depth of about 3.5 m. The casing 53 is a hollow cylindrical body having a diameter of about 3.0 m made of a plate material having sufficient rigidity such as metal, and is erected and fixed at the center of the bottom of the pit. Then, a suction pipe (about 15 cm in diameter) 55 is set at an appropriate depth in the center of the sand filter medium 26. The other end of the suction pipe 55 is connected to a suction pump, and supplies the sucked water to the circulating water receiving tank 30.
The overflow water discharged from the sediment receiving tank 17 is
When the water is drained into the secondary sedimentation tank 20 located on the outer diameter side of No. 3, soil particles centered on the silt content contained in the wastewater settle down in the secondary sedimentation tank 20, As the drainage is continued after the inside is full, most of the pollutants contained in the drainage flow over the casing 53 and flow into the sand filter medium 26. Most of the contaminant-containing water is adsorbed and captured by the sand filter medium while passing through the sand filter medium, and when the water reaches the bottom of the casing 53, the washing is completed. For this reason, the suction pipe 55
The filtered water at the bottom of the sand filter medium is sucked from the tip of the filter and returned to the circulating water receiving tank 30 to be reused as driving water or the like.

If the filtering resistance of the sand filter medium 26 is increased due to clogging or the like, the sand filter medium 26 in the casing may be damaged.
Can be reused by washing by suctioning by the suction pipe 11a of the high-pressure jet device 10. In addition, sludge generated in the sand filter medium 26 and filter medium washing water are subjected to advanced treatment by an advanced treatment device (not shown), and then subjected to off-site disposal or sewer disposal. Here, the advanced treatment includes dehydration solidification, neutralization, coagulation sedimentation, activated carbon treatment and the like. The sediment at the bottom of the sedimentation tank 20 is checked for contamination concentration, and if the degree of contamination exceeds the allowable value, the contamination concentration is set to a standard value by ultraviolet treatment by unwinding a thin layer at a part of the site. After being reduced to the following, it is used as a backfill material. If the degree of contamination is equal to or less than the allowable value, the high-pressure jet soil transport device 31 is used to suck and backfill the original ground. In addition,
At the time of backfilling, it is necessary to consider different backfilling places so that the backfilled soil and the contaminated soil which is to be suctioned and subjected to the cleaning process are not mixed in the ground.
When the contaminant is tar, if the tar contains benzene, cyan, etc., for example, a sand filter 25
In the subsequent stage, an aeration and volatilization treatment, a PH treatment device (alkali chlorine treatment device), and an activated carbon adsorption device are arranged. The water returned to the circulating water receiving tank 30 is in a state where the contaminants have been removed and the cleaning has been completed.
May be reused as driving high-pressure water, or may be used as water supplied to the sediment receiving layer 17 and the secondary sedimentation tank 20. In the case where cleaning is insufficient by performing a series of steps starting from suction by the high-pressure jet device 10 and ending by backfilling by the high-pressure jet sediment transporting device 31, the same process is repeated to perform cleaning. Is completed. In addition, in this method, the suction side pipe 11a, which is a vacuum suction pipe, can be pressed into the contaminated soil and can be sucked and excavated, so that the contaminated soil can be washed with a pinpoint. In addition, the above-described various treatment tanks and equipment can be used in combination according to the soil contamination concentration, flow rate distribution, and contaminants, thereby minimizing equipment investment costs. Since circulating water can be used as the washing water, water treatment costs including water and sewage charges can be minimized. Contaminants that can be effectively cleaned by the systems and methods of the present invention include not only oil-based, but also metal-based contaminants.

Next, each step constituting the cleaning method of the present invention will be described with reference to FIG. First, in the pressure-feed cleaning step (S1) using the pressure-feed cleaning device 12, the contaminated soil is sucked from one end 11a of the pipe 11 using the high-pressure jet device 10 (air-mixing jet pump), and the sucked contaminated soil is piped. In the process of transporting inside the body 11, jet water collides with the contaminated soil to cause three phases of gas, solid, and liquid to collide with each other to separate and wash contaminants attached to the surface of the earth and sand particles. For this reason, most of the pollutants are separated from the earth and sand discharged from the pipe 11b and are shifted to the water side. Next first
In the solid-liquid separation step (S2), wastewater containing soil washed by the pressure-feed cleaning device 12 is supplied into the first sedimentation tank 17 filled with washing water to sediment the earth and sand. If the concentration of sediment in the sediment is lower than the allowable value,
Using the high pressure jet soil transport device 31 as it is, it is sucked and buried in the original ground. In addition, for oil in drainage, water tank 1
This is separated and removed while floating on the water 16 in 5.
If the contamination concentration of the sediment deposited in the water tank 15 in the first solid-liquid separation step is higher than the allowable value, the high-pressure jet sediment transportation device 31 once transports the soil to the holding position and deposits the same. Suction is performed by the pressure-feed cleaning device 12 to perform re-cleaning. When the sediment deposited in the water tank 15 is lower than the allowable contamination concentration again, the soil is returned to the original ground by the high-pressure jet sediment transport device 31. The water used for the washing is drained from the secondary sedimentation tank 20 to the sand filtration device 25 and washed sequentially.

In the subsequent second solid-liquid separation step (S3), the overflow water from the first sedimentation tank 17 is removed from the second sedimentation tank 20.
To feed the soil and sediment the soil. If the contaminant concentration of the sediment (mainly silt) settled in the second sedimentation tank 20 is sufficiently reduced, it is backfilled in the original ground by using the high-pressure jet sediment transporting device 31. If the contamination concentration is not sufficiently reduced, reduce the contamination concentration to a level below the reference value by ultraviolet treatment by unwinding a thin layer at a part of the site, and then use it as a backfill material or dispose of off-site Dispose of. In the subsequent sand filtration step (S4), the overflow water from the second sedimentation tank 20 is received in the sand filter medium 26 and filtered by the sand filter medium. Sludge generated in the sand filter medium 26 and filter medium washing water are subjected to advanced treatment by an advanced treatment device, and then subjected to off-site disposal or sewer disposal.
In the circulating use step (S5), the water filtered by the sand filter medium 26 is temporarily stored in the circulating water receiving tank 30, and supplied for reuse in each of the above steps. According to the cleaning system and the cleaning method having the above-described configuration, the soil particles are tightly filled with the contaminants, and the soil is in a high-concentration contaminated state where air and water hardly exist. Even for high quality contaminated soil, efficient cleaning can be performed at low cost in a short period of time.

Next, soil contaminated with coal-based pollutants such as tar has not been easily purified by any purification method proposed in the past. It has also been considered difficult to purify pollutants such as heavy metals (hexavalent chromium, arsenic, etc.), PCB, nitrate nitrogen and the like. On the other hand, according to the cleaning system and the method of the present invention, after suctioning the soil containing the pollutant and the like, the high-pressure jet water from the air-mix jet pump is collided, so that the pollutant strongly adhered to the soil is removed. Since the soil can be reliably separated and transferred to the water side, the soil from which the pollutants have been removed can be returned to the original ground. It goes without saying that more efficient purification can be realized by using the soil cleaning method according to the present invention in combination with another conventional method.

[0017]

As described above, according to the cleaning system and the cleaning method of the present invention, not only the soil contaminated with a low concentration but also the soil contaminated with a high concentration is sucked from the ground by an air-mixing jet pump. In the process of pumping the inside of the body, the contaminants attached to the soil are removed by colliding with the driving high-pressure water, so that the contaminants can be efficiently removed at a very low cost and in a short period of time. In particular, efficient results can be obtained even for contaminated soil with a high soil density such as clay and silt. Therefore, the problems that occur when a large amount of soil is conveyed into the drum on the ground and the contaminant is separated while rotating the drum as in the past, such as enlargement of equipment, increase in cost, restriction on location conditions, etc. There are no defects. In addition, the sediment from which solids and liquids have been separated by the air-mixing jet pump and from which contaminants have been removed is settled in the water tank, and then suctioned by the high-pressure jet sediment transport device and backfilled into the original ground, so that the backfill work is also high. It can be done efficiently. In addition, since the water used for washing in a series of steps is washed, it is supplied into the circulating water receiving tank, circulated and supplied to each step, and reused. It can be limited to the minimum necessary to prevent an increase in cost. In addition, by repeating a part or all of the steps a plurality of times, it is possible to cope with a case where the cleaning cannot be performed in one step.

[Brief description of the drawings]

FIG. 1 is a facility diagram for implementing a high-pressure jet soil cleaning system and a cleaning method according to an embodiment of the present invention.

FIG. 2 is a view for explaining a cleaning method of the present invention.

FIG. 3 is an explanatory diagram of an internal configuration of a pressure-feed cleaning apparatus.

FIG. 4 is a configuration diagram of a first sedimentation tank.

FIG. 5 is a configuration explanatory view of a second settling tank and a sand filtration device.

[Explanation of symbols]

1 High pressure jet soil washing system, 2 plant equipment, 3
Soil improvement section, 10 high-pressure jet device, 11 pipe, 11
a suction side pipe, 11b discharge side pipe, 12 pressure washing device, 13 earth and sand, 15 water tank, 16 washing water, 17 earth and sand receiving tank (primary sedimentation tank), 20 secondary sedimentation tank, 25 sand filtration device, 26 sand Filter media, 30 Circulating water receiving tank, 31
High pressure jet sediment transporting device, 36 pressure water pipe, 36a nozzle, 37 gas (outside air) introduction pipe, 38 pressure water supply source, 50 pits, 51 embankment, 52 waterproof sheet, 5
3 Casing.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 11/00 B09B 5/00 ZABS E02D 3/00 101 B01D 23/16 (72) Inventor Yosuke Shikata Tokyo 2-5-17 Mure, Mitaka F-term (reference) 2D043 CA01 CA20 EB06 4D004 AA41 AB02 AB03 AB06 AC07 CA13 CA40 CB42 CC03 DA02 DA07 4D041 BA01 BB04 CB07 4D059 AA09 AA10 AA11 AA18 BH01 BH04 BH06 BK06 ACB4 DA034

Claims (5)

[Claims] 1. A method in which contaminated soil is sucked from one end of a pipe using an air-mixing jet pump, and driving high-pressure water is ejected to the contaminated soil in the process of transporting the sucked contaminated soil through the pipe, thereby forming gas or solid. A pressurized cleaning device that separates and cleans contaminants attached to the sediment particles by colliding three phases of liquid, and a water tank filled with cleaning water, and receives wastewater containing sediment washed by the pressurized cleaning device. A first sedimentation tank for solid-liquid separation for sedimenting earth and sand, a second sedimentation tank for solid-liquid separation for receiving overflow water from the first sedimentation tank, and an overflow from the second sedimentation tank A high pressure jet soil washing system, comprising: a sand filtration device that receives running water and filters through a sand filter medium; and a circulating water receiving tank that receives water filtered by the sand filtration device. 2. The method according to claim 1, wherein the water in the circulating water receiving tank is circulated and supplied to at least one of the pressure-feed cleaning device, the first settling tank, and the second settling tank. Item 2. A high pressure jet soil washing system according to item 1. 3. A high-pressure jet sediment transport device for returning the washed sediment settled in the first settling tank or the second settling tank to the ground.
Or the high pressure jet soil washing system according to 2. 4. A method in which contaminated soil is sucked from one end of a pipe using an air-mixing jet pump, and driving high-pressure water collides with the contaminated soil in the process of transporting the sucked contaminated soil through the pipe to form gas or solid. A pressurized washing step of separating and washing contaminants adhering to the surface of the earth and sand particles by colliding three phases of liquid; and a wastewater containing earth and sand that has been washed by the pumping and washing apparatus, the first of which is filled with washing water. A first solid-liquid separation step of supplying the sedimentation tank to sediment the soil, and a second solid-liquid separation step of supplying overflow water from the first sedimentation tank to the second sedimentation tank to sediment the earth and sand. A separation step; a sand filtration step of receiving overflow water from the second sedimentation tank and filtering it with a sand filter medium; and a circulating use step of circulating and using the water filtered by the sand filter medium. And high pressure jet soil washing method. 5. A holding step of sucking and conveying the sediment separated in the first solid-liquid separation step in the first solid-liquid separation step and deposited in the first sedimentation tank by a high-pressure jet sediment conveying device, and temporarily holding the sediment; The soil once held in the step is sucked again from one end of the pipe using the air-jet jet pump, and in the process of transporting the sucked contaminated soil through the pipe, driving high-pressure water collides with the contaminated soil to form a gas, A re-pressure cleaning step of separating and cleaning contaminants adhering to the surface of the earth and sand particles by colliding three phases of solid and liquid, and a first sediment filled with cleaning water by re-cleaning the soil and sand by the pressure cleaning apparatus. The high pressure jet soil cleaning method according to claim 4, further comprising at least a second first solid-liquid separation step of feeding the water into the tank to settle the earth and sand.