JP2005230710A - In situ insolubilization control apparatus and method for contaminated soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To directly monitor in real time the condition that an insolubilizing agent is stirred and mixed with contaminated soil in a desired state. <P>SOLUTION: An in-situ insolubilization control apparatus 1 has a monitoring sensor 4 and a discharge pipe 5, which is a chemical discharge means for discharging the insolubilizing agent, installed in a trencher type ground improving machine 3, and has a monitor 6 for displaying measurement data acquired by the sensor 4. The base-end sides of the pipe 5 are connected in communication with a first reservoir tank 7 storing cement milk (solidifying material) as an insolubilizing agent and a second tank 8 storing a ferrous chloride water solution as the insolubilizing agent. A connection destination can be selectively switched. The tip end has a discharge port 10 formed for discharging the cement milk or the ferrous chloride water solution into the contaminated soil. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an in-situ insolubilization management apparatus and method for contaminated soil that insolubilizes soil contaminated with contaminants such as heavy metals in-situ.

  Various pollutants such as volatile organic chlorine compounds such as trichlorethylene, fuel oils and machine oils, dioxins, and heavy metals such as cadmium, lead, copper, zinc, nickel and chromium are found in the soil of the factory site. May be in the soil.

  If the contaminated soil contaminated with such pollutants is left as it is, the contaminants mixed in the soil will diffuse to the surroundings, hindering the lives of the surrounding residents, and if it is released from the soil particles by rainwater In addition, it may cause contamination of groundwater by contaminating water quality. Therefore, the soil contaminated with the above-mentioned contaminants must be purified or insolubilized using various methods.

  As a method of insolubilizing in-situ contaminants in the soil, heavy machinery used in soft ground improvement methods such as a deep layer processing machine used for horizontal blade mechanical stirring method and a shallow layer processing machine used for vertical continuous mixing stirring method, for example A technique of stirring and mixing while injecting an insolubilizing agent into contaminated soil is known.

JP2001-334135 JP 2002-018413 A

  Here, in order to ensure the insolubilization of the pollutant, it is necessary to inject a desired amount of the insolubilizing agent into a desired region. For the monitoring of the insolubilizing agent injection, conventionally, the contaminated soil is stirred and mixed. For this reason, there is room for improvement in terms of accuracy as a monitoring method, since it can only be performed indirectly based on indicators such as the number of blades of the agitating blade, the penetration speed, or the discharge amount of the medicine or auxiliary agent.

  Further, when a solidifying material such as cement is used as the insolubilizing agent, in order to confirm the effect of the insolubilizing agent injection, it is necessary to wait for the solidifying material to mix with the agitated and mixed soil particles and solidify. Therefore, if a defect in the insolubilization treatment is discovered after conducting a boring survey afterwards, it is necessary to improve the re-stirring and re-injection of the solidified ground, resulting in the problem of enormous costs and time. It was happening.

  The present invention has been made in consideration of the above-described circumstances, and in situ insolubilization management apparatus for contaminated soil that can directly monitor insolubilizing agent in a desired state with stirring and mixing with contaminated soil in real time. And to provide a method.

  In order to achieve the above object, the in-situ insolubilization management device for contaminated soil according to the present invention includes a soil mixing stirrer provided with a medicine discharge means for discharging an insolubilizing agent, and a monitoring device as described in claim 1. A sensor and a monitor for displaying the measurement data obtained by the monitoring sensor, wherein the soil mixing agitator is a vertical continuous mixing agitation type ground improvement machine, and the medicine discharge means is formed at the tip thereof It comprises a discharge pipe, the discharge pipe and the monitoring sensor are built in the vertical continuous mixing and stirring type ground improvement machine, and the monitoring sensor is at least one of the electrical resistivity, electrical conductivity, pH and temperature of the ground. Any one of them can be measured as management data.

  In addition, the in-situ insolubilization management device for contaminated soil according to the present invention includes a soil mixing stirrer provided with a medicine discharge means for discharging an insolubilizing agent, a monitoring sensor, and the monitoring device. The soil mixing stirrer is composed of a hollow rod and a stirring blade projecting from its peripheral surface, and a discharge port is formed at the tip of the hollow rod. The monitoring means is provided on the peripheral surface of the hollow rod or the stirring blade, and the monitoring sensor manages at least one of electrical resistivity, electrical conductivity, pH and temperature of the ground. The data can be measured.

  Moreover, the in-situ insolubilization management method for contaminated soil according to the present invention, as described in claim 3, stirs the contaminated soil while discharging the insolubilizing agent containing the solidifying material or used together with the solidifying material into the contaminated soil. Mixing and measuring at least one of the electrical resistivity, electrical conductivity, pH and temperature of the agitated and mixed area of the contaminated soil as management data during or immediately after agitation and mixing, Among them, the reprocessing area where the insolubilization process is insufficient is specified using the management data, and then the insolubilizing agent is discharged and stirred and mixed again before the reprocessing area is solidified with respect to the specified reprocessing area. Is what you do.

  In the in-situ insolubilization management device for contaminated soil according to claim 1, a monitoring sensor configured to be capable of measuring at least one of electrical resistivity, electrical conductivity, pH and temperature of the ground as management data, and insolubilization Dispensing pipe, which is a medicine discharge means for discharging agent, is built into the vertical continuous mixing and stirring type ground improvement machine, and vertical continuous mixing and stirring type ground improvement while insoluble agent is injected into the contaminated soil through the discharging pipe Stir and mix the contaminated soil with a machine.

  Here, during stirring and mixing, the measurement data sent from the monitoring sensor is displayed on the monitor.

  In this way, while discharging the insolubilizing agent and stirring and mixing, it is possible not only to monitor and grasp the state of insolubilization treatment, mainly the infiltration of the insolubilizing agent into the contaminated soil in real time, from the management data described above. Even if a solidifying material is used together with an insolubilizing agent or an insolubilizing agent containing a solidifying material, since the contaminated soil has not yet solidified, the insolubilizing agent is judged to be insufficient for the continuous treatment area. The insolubilization treatment can be continued by changing the kind, discharge amount or stirring speed.

  Therefore, uniform insolubilization treatment becomes possible, and even when a solidifying material is used in combination with an insolubilizing agent or an insolubilizing agent containing the solidifying material, the insolubilizing agent is discharged again or mixed after the contaminated soil is solidified. There is no need to do.

  In addition, as can be seen from the above description, the invention according to claim 1 includes any of the case where the solidifying material is not included in the insolubilizing agent, the case where the solidifying material is included in the insolubilizing agent, and the case where the solidifying material is used separately from the insolubilizing agent. In any case, while discharging the insolubilizing agent and stirring and mixing, the status of the insolubilization treatment, mainly the infiltration of the insolubilizing agent into the contaminated soil, is managed in real time from the management data. There is no difference in being able to monitor and understand.

  Here, the case where the solidifying material is not included in the insolubilizer includes, for example, a case where an insolubilizing agent intended to be detoxified by oxidizing a pollutant is used, and the use of the insolubilizing agent does not reduce the strength of the ground. .

  The case where the insolubilizing agent includes a solidifying material corresponds to the case where the solidifying action of the solidifying material is used to prevent the elution of contaminants. In this case, the solidification material is intended to be insolubilized.

  Moreover, the case where a solidifying material is used in combination with the insolubilizing agent corresponds to the case where the water content ratio of the ground becomes high due to the use of the insolubilizing agent and the strength of the ground needs to be improved by the solidifying material. In this case, the purpose of the solidified material is to improve the strength.

  As the insolubilizing agent, known ones such as cement-based solidified material, lime-based solidified material, bentonite, ferrous chloride, ferric chloride, and iron sulfate may be adopted. desirable.

  In the in-situ insolubilization management device for contaminated soil according to claim 2, a monitoring sensor configured to be able to measure at least one of electrical resistivity, electrical conductivity, pH, and temperature of the ground as management data, Provided on the peripheral surface of the hollow rod constituting the mixing stirrer or the stirring blade, and the hollow rod is used as a medicine discharge means, and the contaminated soil is stirred and mixed with the stirring blade while insolubilizing agent is injected into the contaminated soil through the hollow rod. .

  Here, during stirring and mixing, the measurement data sent from the monitoring sensor is displayed on the monitor.

  This makes it possible not only to monitor and grasp the state of insolubilization treatment, mainly the state of penetration of the insolubilizing agent into the contaminated soil in real time from the above-mentioned management data while discharging and stirring and mixing the medicine. Even if a solidifying material is used in combination with an insolubilizing agent or an insolubilizing agent, the contaminated soil is not yet solidified, so the type of insolubilizing agent for the continuous treatment area that is judged to be insufficient for the insolubilizing treatment. Further, the insolubilization treatment can be performed by changing the discharge amount or the stirring speed.

  Therefore, uniform insolubilization treatment becomes possible, and even when a solidifying material is used in combination with an insolubilizing agent or an insolubilizing agent containing the solidifying material, the insolubilizing agent is discharged again or mixed after the contaminated soil is solidified. There is no need to do.

  The invention according to claim 2 is applicable to any of the case where the solidifying material is not included in the insolubilizing agent, the case where the solidifying material is included in the insolubilizing agent, and the case where the solidifying material is used separately from the insolubilizing agent, as in the case of the first aspect. The description about them is omitted here.

  As the insolubilizing agent, known ones such as cement-based solidified material, lime-based solidified material, bentonite, ferrous chloride, ferric chloride, and iron sulfate may be adopted. desirable.

  In the in-situ insolubilization management method for contaminated soil according to claim 3, the contaminated soil is stirred and mixed while discharging the insolubilizing agent containing the solidifying material or used in combination with the solidifying material into the contaminated soil.

  Next, at least any one of the electrical resistivity, electrical conductivity, pH, and temperature of the stirred and mixed region of the contaminated soil is measured as management data during or immediately after the stirring and mixing.

  Next, among these areas, a reprocessing area where the insolubilization process is insufficient is specified using management data.

  Next, the insolubilizing agent is discharged and stirred and mixed again for the specified reprocessing area before the reprocessing area is solidified.

  In this way, it is possible not only to monitor and grasp the status of the insolubilization treatment from the management data, mainly the penetration status of the insolubilizing agent into the contaminated soil, but the insolubilization treatment is insufficient because the contaminated soil has not yet solidified. About the reprocessing area | region judged, discharge and stirring mixing of an insolubilizing agent can be performed again.

  Therefore, a uniform insolubilization process can be performed, and it is not necessary to perform high-cost re-discharge and stirring and mixing after the contaminated soil is solidified.

  In addition, since the insolubilization state can be directly grasped, the insolubilization process can be performed with high accuracy.

  The case where the insolubilizing agent contains a solidifying material corresponds to the case where the solidifying action of the solidifying material is used to prevent the elution of contaminants. In this case, the solidification material is intended to be insolubilized.

  Moreover, the case where a solidifying material is used in combination with the insolubilizing agent corresponds to the case where the water content ratio of the ground becomes high due to the use of the insolubilizing agent and the strength of the ground needs to be improved by the solidifying material. In this case, the purpose of the solidified material is to improve the strength.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an in-situ insolubilization management apparatus and method for contaminated soil according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a diagram showing an in-situ insolubilization management device for contaminated soil according to the present embodiment. In-situ insolubilization management device 1 for contaminated soil according to the present embodiment is a vertical continuous mixing and stirring type that is a soil mixing stirrer at the tip of an arm of a backhoe (not shown; refer to reference numeral 2 in FIG. 2) that is a base machine. A trencher type ground improvement machine 3 as a ground improvement machine is attached, and a monitoring sensor 4 and a discharge pipe 5 as a medicine discharge means for discharging an insolubilizing agent are incorporated in the trencher type ground improvement machine, and the monitoring sensor 4 The measurement data obtained in (1) is displayed on the monitor 6.

  The proximal end side of the discharge pipe 5 includes a first storage tank 7 in which cement milk (solidifying material) as an insolubilizer is stored, and a second storage tank in which an aqueous ferrous chloride solution as an insolubilizer is stored. 8 is connected to each other, and the communication destination can be selectively switched, and at the tip thereof is a discharge for discharging cement milk or ferrous chloride aqueous solution into the contaminated soil. An outlet 10 is formed.

  In order to selectively connect the first storage tank 7 and the second storage tank 8 to the discharge pipe 5, for example, supply hoses from the first storage tank 7 and the second storage tank 8 are connected to the discharge pipe 5. What is necessary is just to comprise so that it can connect to the base end side so that attachment or detachment is possible. If there is no risk of clogging with cement milk, a directional control valve is interposed between the first storage tank 7 or the second storage tank 8 and the discharge pipe 5, and the supply-side tank is switched at any time. It doesn't matter if you do.

  The trencher type ground improvement machine 3 is configured to be able to stir and mix the contaminated soil in the original position while discharging the insolubilizing agent to the contaminated soil via the discharge pipe 5 described above.

  The monitoring sensor 4 is configured to be able to measure the electrical resistivity of the ground as management data. If necessary, it is desirable to provide a computer with a built-in storage medium for storing management data measured by the monitoring sensor 4 and a control device for controlling the monitoring sensor 4.

  In order to perform insolubilization processing of contaminated soil using the in situ insolubilization management apparatus 1 for contaminated soil according to this embodiment, first, as shown in FIG. And the contaminated soil is stirred and mixed by the trencher type ground improvement machine 3 while injecting cement milk into the contaminated soil 21.

  The contaminated soil 21 is soil contaminated with contaminants made of heavy metals such as cadmium, lead, copper, zinc, nickel, chromium, etc., but the contaminants are not limited to heavy metals and prevent elution. All necessary hazardous substances are included.

  The ferrous chloride aqueous solution and cement milk may be selected as appropriate depending on the type and concentration of the pollutant contained in the contaminated soil 21, and may be selected as appropriate. If possible, the contaminated soil 21 may be stirred and mixed while injecting only cement milk, and insolubilization with two types of insolubilizing agents, ferrous chloride and cement milk, is appropriate. In such a case, the contaminated soil 21 is agitated and mixed while injecting ferrous chloride aqueous solution as the first pass, and then the agitated and mixed region in the first pass is agitated while injecting cement milk as the second pass. What is necessary is just to make it mix. Here, the pass means stirring and mixing in one direction, for example, a step of stirring and mixing along the front side from the far side as seen from the backhoe 2.

  Here, during stirring and mixing, the measurement data sent from the monitoring sensor 4 is displayed on the monitor 6, and while looking at the management data displayed on the monitor, the state of the insolubilization treatment, mainly to the contaminated soil 21 of the insolubilizing agent. Monitor the penetration status.

  As a result of monitoring, in the area where the insolubilization process is judged to be insufficient, that is, the continuous process area, the insolubilization process is continuously performed by changing the type, discharge amount, or stirring speed of the insolubilizing agent.

  As described above, according to the in-situ insolubilization management apparatus 1 for contaminated soil according to the present embodiment, the state of insolubilization treatment, mainly the insolubilizing agent, can be obtained from the management data described above while discharging and stirring and mixing the insolubilizing agent. In addition to being able to monitor and grasp the state of penetration of the soil into the contaminated soil 21 in real time, the contaminated soil 21 injected with the solidifying material that is one of the insolubilizing agents has not yet solidified, and therefore the insolubilization process is insufficient. About the continuation process area | region judged, the insolubilization process can be continuously performed by changing the kind of insolubilizing agent, the discharge amount, or the stirring speed.

  Therefore, a uniform insolubilization process can be performed, and it is not necessary to perform high-cost drug discharge and stirring and mixing of the insolubilizer after the contaminated soil is solidified.

  In addition, since the insolubilization state can be directly grasped, the insolubilization process can be performed with high accuracy.

  In the present embodiment, the monitoring sensor 4 is configured to measure the electrical resistivity of the ground, but the monitoring sensor of the present invention is not limited to such a configuration, and the electrical resistivity and electrical conductivity of the ground are not limited. It is sufficient to configure so that it can be measured in any combination among the degree, the pH of the ground, and the temperature of the ground. For example, only the pH of the ground or only the temperature of the ground may be measured, or all indicators may be measured, or the electrical resistivity of the ground and the pH of the ground may be measured. It doesn't matter.

  Further, although not particularly mentioned in the present embodiment, a pH adjuster may be appropriately used as necessary when insolubilization is performed.

(Second Embodiment)

  FIG. 3 is a view showing an in-situ insolubilization management device for contaminated soil according to the second embodiment. The in-situ insolubilization management device 31 for contaminated soil according to the present embodiment is a soil mixing stirrer in which a spiral stirring blade 33 is attached to the peripheral surface of a hollow rod 32 and an excavation blade 34 is attached to the tip of the hollow rod. It is generally composed of an earth auger 35, a monitoring sensor 4 provided on the peripheral surface of the hollow rod 32 of the earth auger, and a monitor 6 for displaying measurement data obtained by the monitoring sensor 4.

  The earth auger 35 is configured to be rotatable around a member axis, that is, around a material axis of the hollow rod 32 via a drive mechanism (not shown), and is configured to stir and mix the contaminated soil 21. In addition, this earth auger 35 can divert the stirring mixer used for the soft ground improvement construction, for example.

  Here, the hollow rod 32 of the earth auger 35 has a double tube structure, and a drug supply pipe 38 is coaxially inserted into the hollow rod, and the tip of the drug supply pipe 38 forms a discharge port 36. In addition, a discharge port 37 is formed on the peripheral surface located near the tip of the hollow rod 32. That is, the hollow rod 32, the medicine supply pipe 38 inserted therein and the discharge ports 36 and 37 constitute a medicine discharge means.

  The proximal end side of the hollow rod 32 is connected in communication with the first storage tank 7 in which cement milk (solidifying material) as an insolubilizing agent is stored, and the outer surface of the drug supply pipe 38 and the inner surface of the hollow rod 32 are connected. Cement milk can be discharged from the discharge port 37 through a space formed therebetween. Further, the proximal end side of the medicine supply pipe 38 is connected in communication with the second storage tank 8 in which the ferrous chloride aqueous solution as an insolubilizing agent is stored, and is chlorinated from the discharge port 36 via the medicine supply pipe 38. A ferrous aqueous solution can be discharged.

  The earth auger 35 discharges cement milk and ferrous chloride aqueous solution, which are insolubilizing agents, from the discharge port 37 and the discharge port 36 to the contaminated soil 21 through the hollow rod 32 and the drug supply pipe 38, respectively. Can be stirred and mixed in-situ.

  The monitoring sensor 4 is configured to be able to measure the electrical resistivity of the ground as management data. If necessary, it is desirable to provide a computer with a built-in storage medium for storing management data measured by the monitoring sensor 4 and a control device for controlling the monitoring sensor 4.

  In order to insolubilize contaminated soil using the contaminated soil in-situ insolubilization management device 31 according to the present embodiment, first, the earth auger 35 is driven to excavate the contaminated soil 21.

  Next, when the earth auger 35 is reversely rotated and pulled out, the ferrous chloride aqueous solution is discharged from the discharge port 36 and the cement milk is discharged from the discharge port 37 to be poured into the contaminated soil 21. Stir and mix.

  The ferrous chloride aqueous solution and cement milk may be selected as appropriate depending on the type and concentration of the pollutant contained in the contaminated soil 21, and may be selected as appropriate. If possible, the contaminated soil 21 may be stirred and mixed while injecting only cement milk, and insolubilization with two types of insolubilizing agents, ferrous chloride and cement milk, is appropriate. In such a case, the aqueous ferrous chloride solution may be pre-injected, and the cement milk may be agitated and mixed while injecting thereafter.

  However, various combinations of ferrous chloride aqueous solution and cement milk supply can be considered in relation to the movement of the earth auger 35, for example, stirring and mixing while injecting ferrous chloride aqueous solution at the first penetration, and inversion You may make it stir-mix while injecting cement milk in the subsequent drawing, or stir-mix while injecting ferrous chloride aqueous solution in the first reversing drawing, and the cement milk in the drawing after the second reversing. You may make it stir-mix while inject | pouring. Even when cement milk is used alone, it is optional whether it is performed at the time of penetration or at the time of drawing.

  Here, during stirring and mixing, the measurement data sent from the monitoring sensor 4 is displayed on the monitor 6, and while looking at the management data displayed on the monitor, the state of the insolubilization treatment, mainly to the contaminated soil 21 of the insolubilizing agent. Monitor the penetration status.

  As a result of monitoring, in the area where the insolubilization process is judged to be insufficient, that is, the continuous process area, the insolubilization process is continuously performed by changing the type, discharge amount, or stirring speed of the insolubilizing agent.

  As described above, according to the in-situ insolubilization management device 31 for contaminated soil according to the present embodiment, the state of insolubilization processing, mainly the insolubilizing agent, can be obtained from the management data described above while discharging and stirring and mixing the insolubilizing agent. In addition to being able to monitor and grasp the state of penetration of contaminated soil 21 in real time, since the contaminated soil 21 into which the insolubilizing agent has been injected has not yet solidified, the continuous processing region that is determined to lack insolubilization treatment Can continue the insolubilization treatment by changing the type, discharge amount or stirring speed of the drug.

  Therefore, a uniform insolubilization process can be performed, and it is not necessary to perform high-cost re-discharge and stirring and mixing after the contaminated soil is solidified.

  In addition, since the insolubilization state can be directly grasped, the insolubilization process can be performed with high accuracy.

  In the present embodiment, the monitoring sensor 4 is configured to measure the electrical resistivity of the ground, but the monitoring sensor of the present invention is not limited to such a configuration, and the electrical resistivity and electrical conductivity of the ground are not limited. It is sufficient to configure so that it can be measured in any combination among the degree, the pH of the ground, and the temperature of the ground. For example, only the pH of the ground or only the temperature of the ground may be measured, or all indicators may be measured, or the electrical resistivity of the ground and the pH of the ground may be measured. It doesn't matter.

  In the present embodiment, the hollow rod 32 of the earth auger 35 has a double tube structure, and the hollow rod 32, the drug supply pipe 38 inserted therein and the discharge ports 36 and 37 constitute the drug discharge means of the present invention. However, instead of such a configuration, the hollow rod is constituted by a single pipe (single pipe), and an insolubilizing agent such as ferrous chloride aqueous solution and cement milk is connected to the single pipe in the same manner as in the first embodiment. You may comprise so that it may switch suitably.

  In the present embodiment, the monitoring sensor 4 is provided on the peripheral surface of the hollow rod 32, but may be provided on the stirring blade instead.

  Further, although not particularly mentioned in the present embodiment, a pH adjuster may be appropriately used as necessary when insolubilization is performed.

(Third embodiment)

  Next, a third embodiment will be described.

  In the in-situ insolubilization management method for contaminated soil according to the present embodiment, the contaminated soil is stirred and mixed while discharging the insolubilizing agent containing the solidifying material or used in combination with the solidifying material into the contaminated soil.

  Here, the case where the insolubilizing agent includes a solidifying material corresponds to the case where the elution of the pollutant is prevented by utilizing the solidifying action of the solidifying material. In this case, the solidification material is intended to be insolubilized.

  Moreover, the case where a solidifying material is used in combination with the insolubilizing agent corresponds to the case where the water content ratio of the ground becomes high due to the use of the insolubilizing agent and the strength of the ground needs to be improved by the solidifying material. In this case, the purpose of the solidified material is to improve the strength.

  As such a solidifying material, a cement-based solidifying material, a lime-based solidifying material, or the like can be employed.

  Here, in the contaminated soil 21, the electrical resistivity and electrical conductivity of the ground in the agitated and mixed area, the pH of the ground or the temperature of the ground are measured and used as management data. The situation, mainly the penetration state of the insolubilizing agent into the contaminated soil 21 is monitored.

  Here, the timing for measuring the management data is during or immediately after the stirring and mixing, and as a means for the measurement, a dedicated measurement device capable of measuring the electrical resistivity of the ground, the pH of the ground or the temperature of the ground is used. . The measurement dedicated device may be appropriately selected from known devices.

  Next, among these areas, an area where the insolubilization process is insufficient is identified as a reprocessing area using management data, and then the solidified material is solidified before the reprocessing area is solidified with respect to the identified reprocessing area. The insoluble agent used in combination with the solidifying material is discharged and stirred and mixed again.

  As described above, according to the in-situ insolubilization management method for contaminated soil according to the present embodiment, it is only possible to monitor and grasp the state of insolubilization processing, mainly the penetration state of the insolubilizing agent into the contaminated soil from the management data. In addition, because the contaminated soil into which the insolubilizing agent has been injected has not yet solidified, for the reprocessing area that is judged to lack insolubilizing treatment, discharge and stirring and mixing of the insolubilizing agent containing the solidifying material or used in combination with the solidifying material Can be done again.

  Therefore, a uniform insolubilization process can be performed, and it is not necessary to perform re-discharge and stirring / mixing after the contaminated soil is solidified at high cost.

  In addition, since the insolubilization state can be directly grasped, the insolubilization process can be performed with high accuracy.

  Further, although not particularly mentioned in the present embodiment, a pH adjuster may be appropriately used as necessary when insolubilization is performed.

Schematic of the in-situ insolubilization management device for contaminated soil according to the first embodiment. The figure which showed a mode that the insolubilization process was performed using the in-situ insolubilization management apparatus of the contaminated soil which concerns on 1st Embodiment. Schematic of the in-situ insolubilization management apparatus of the contaminated soil which concerns on 2nd Embodiment.

Explanation of symbols

1,31 In-situ insolubilization management equipment for contaminated soil 3 Trencher type ground improvement machine
(Vertical continuous mixing stirring type soil mixing stirring machine)
4 Monitoring sensor 5 Discharge pipe (medicine discharge means)
6 Monitor 7 First storage tank 8 Second storage tank 21 Contaminated soil 32 Hollow rod (medicine discharge means)
33 Stirring blade 35 Earth auger (soil mixing stirrer)
36, 37 Discharge port (medicine discharge means)
38 Drug supply pipe (drug discharge means)

Claims (3)

A soil mixing stirrer provided with a medicine discharge means for discharging the insolubilizing agent, a monitoring sensor, and a monitor for displaying measurement data obtained by the monitoring sensor, the soil mixing stirrer being vertically continuous mixed It is a stirring type ground improvement machine and the medicine discharge means is constituted by a discharge pipe having a discharge port formed at the tip, and the discharge pipe and the monitoring sensor are incorporated in the vertical continuous mixing and stirring type ground improvement machine, An in-situ insolubilization management device for contaminated soil, wherein the monitoring sensor is configured to be capable of measuring at least one of electrical resistivity, electrical conductivity, pH, and temperature of the ground as management data. A soil mixing stirrer provided with a medicine discharge means for discharging the insolubilizing agent, a monitoring sensor, and a monitor for displaying measurement data obtained by the monitoring sensor, the soil mixing stirrer being a hollow rod and It comprises a stirring blade projecting on its peripheral surface and forms a discharge port at the tip of the hollow rod as the drug discharging means, and the monitoring sensor is provided on the peripheral surface of the hollow rod or the stirring blade, An in-situ insolubilization management apparatus for contaminated soil, wherein the monitoring sensor is configured to be able to measure at least one of electrical resistivity, electrical conductivity, pH and temperature of the ground as management data. Stirring and mixing the contaminated soil while discharging the insolubilizer containing the solidifying material or used together with the solidifying material into the contaminated soil, and the electrical resistivity, electrical conductivity, pH of the agitated and mixed region of the contaminated soil And at least one of temperature and temperature is measured as management data during or immediately after stirring and mixing, and a reprocessing area that lacks insolubilization treatment is identified using the management data, and then identified. An in-situ insolubilization management method for contaminated soil, wherein the insolubilizing agent is discharged and agitated and mixed again before the reprocessing region solidifies.

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