JP2019030822A - Subsurface soil purification system - Google Patents

Abstract

To prevent a clog in a pouring well through which an activator liquid is poured into soil.SOLUTION: A subsurface soil purification system 10 includes: an activator liquid generation part 40 to generate an activator liquid containing an activator for activating degrading microorganism that decomposes contaminated substance in contaminated soil 12B1; a warmed liquid generation part 50 to generate a warmed liquid that is warmed separately from the activator liquid; and a pouring well 16 through which the activator liquid and the warmed liquid are poured into the contaminated soil 12B1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an underground soil purification system.

  There is known an underground soil purification system that increases the purification efficiency of contaminated soil by injecting a heated warming solution into the contaminated soil from an injection well and heating the contaminated soil (for example, Patent Document 1).

  In addition, a heat storage system that stores waste heat of cogeneration (cogeneration system) on the ground is known (for example, Patent Document 2).

JP 2014-205086 A JP 2006-329598 A

  By the way, as a purification method of contaminated soil, for example, an activator liquid to which an activator (nutrient) such as a hydrogen sustained-release agent or a yeast extract is added is injected from the injection well into the contaminated soil, and the contaminated soil is contaminated. Biomethods (biostimulation) are known in which microorganisms that decompose substances (hereinafter referred to as “decomposing microorganisms”) are grown and activated to promote the purification of contaminants by the decomposing microorganisms.

  In such a biomethod, in order to further activate the decomposing microorganism, it is conceivable to inject a warmed activator solution into the contaminated soil and heat the contaminated soil.

  However, in this case, other microorganisms in the activator solution are also activated, and biofilms and the like are easily generated. As a result, the injection well for injecting the activator liquid into the soil is likely to be clogged, and the efficiency of injecting the activator liquid from the injection well into the contaminated soil may be reduced.

  In view of the above facts, the present invention aims to suppress clogging of an injection well in which an activator solution is injected into soil.

  The underground soil purification system according to claim 1, wherein an activator solution generating unit that generates an activator solution to which an activator that activates decomposing microorganisms that decompose soil contaminants is added, and the activator solution, Separately, a warming liquid generating unit that generates a warmed warming liquid and an injection well for pouring the activator liquid and the warming liquid into soil are provided.

  According to the underground soil purification system which concerns on Claim 1, an activator liquid production | generation part produces | generates an activator liquid. An activator that activates decomposing microorganisms that degrade soil pollutants is added to the activator solution. Moreover, a warming liquid production | generation part produces | generates the heated warming liquid. A warming liquid production | generation part produces | generates a warming liquid separately from an activator liquid. These activator liquid and warming liquid are injected into the soil from the injection well.

  Here, the warming liquid generator generates the warming liquid separately from the activator liquid. That is, the warming liquid generator does not warm the activator liquid. Thereby, activation of the microorganisms in an activator liquid is suppressed. As a result, the production of biofilm or the like is suppressed. Therefore, clogging of the injection well is suppressed.

  Moreover, an activator liquid and a heating liquid are inject | poured into soil from the same injection well. Therefore, the number of injection wells is reduced as compared with the case where the activator liquid and the warming liquid are injected into the soil from separate injection wells. Therefore, the construction cost of the injection well can be reduced.

  The underground soil purification system according to claim 2, wherein an activator liquid generating unit that generates an activator liquid to which an activator that activates decomposing microorganisms that decompose pollutants in the soil is added, and the activator liquid, Separately, a warming liquid generating part for generating a warmed warming liquid, an activator liquid injecting well for injecting the activator liquid into the soil, and a warming liquid injection well for injecting the warming liquid into the soil And comprising.

  According to the underground soil purification system which concerns on Claim 2, an activator liquid production | generation part produces | generates an activator liquid. An activator that activates decomposing microorganisms that degrade soil pollutants is added to the activator solution. This activator solution is injected into the soil from the activator solution injection well.

  Moreover, a warming liquid production | generation part produces | generates the heated warming liquid. A warming liquid production | generation part produces | generates a warming liquid separately from an activator liquid. This warming liquid is injected into the soil from the warming liquid injection well.

  Here, the warming liquid generator generates the warming liquid separately from the activator liquid. That is, the warming liquid generator does not warm the activator liquid. Thereby, activation of the microorganisms in an activator liquid is suppressed. As a result, the production of biofilm or the like is suppressed. Therefore, clogging of the injection well is suppressed.

  The activator solution is injected into the soil from the activator solution injection well, and the warming solution is injected into the soil from the warming solution injection well. Thereby, since the temperature rise in the activator liquid injection well is suppressed, clogging of the activator liquid injection well is further suppressed.

  The underground soil purification system according to claim 3, wherein an activator liquid generating unit that generates an activator liquid to which an activator that activates decomposing microorganisms that decompose soil contaminants is added, and the activator liquid, Separately, a warming liquid generating unit for generating a warmed warming liquid, an injection well for pouring the activator liquid into the soil, and heat provided in the soil to exchange heat between the soil and the warming liquid And an exchange unit.

  According to the underground soil purification system which concerns on Claim 3, an activator liquid production | generation part produces | generates an activator liquid. An activator that activates decomposing microorganisms that degrade soil pollutants is added to the activator solution. This activator solution is injected into the soil from the injection well.

  Moreover, a warming liquid production | generation part produces | generates the heated warming liquid. A warming liquid production | generation part produces | generates a warming liquid separately from an activator liquid. This warming solution is heat-exchanged with soil in a heat exchange section provided in the soil. Thereby, soil is heated.

  Here, the warming liquid generator generates the warming liquid separately from the activator liquid. That is, the warming liquid generator does not warm the activator liquid. Thereby, activation of the microorganisms in an activator liquid is suppressed. As a result, the production of biofilm or the like is suppressed. Therefore, clogging of the injection well is suppressed.

  Moreover, for example, when injecting a warming liquid into the soil from the injection well, the warming liquid is diffused into the soil. Therefore, the soil is warmed over a wide range.

  On the other hand, when heat is exchanged between the warming solution and the soil in the heat exchanging section, the soil can be locally heated. Therefore, the heating efficiency of the predetermined part of soil can be improved.

  The underground soil purification system according to claim 4 is the underground soil purification system according to any one of claims 1 to 3, wherein the warming liquid generating unit is configured to perform the heating by exhaust heat of a cogeneration system. A warm liquid is produced.

  According to the underground soil purification system which concerns on Claim 4, a warming liquid production | generation part produces | generates a warming liquid with the waste heat of a cogeneration system. Thereby, the exhaust heat of a cogeneration system can be used effectively. Therefore, energy saving can be achieved.

  As described above, according to the underground soil purification system according to the present invention, clogging of the injection well for injecting the activator liquid into the soil can be suppressed.

It is a longitudinal section showing the ground where the underground soil purification system concerning a first embodiment was applied. It is a longitudinal cross-sectional view which shows the ground to which the underground soil purification system which concerns on 2nd embodiment was applied. It is a longitudinal cross-sectional view which shows the ground to which the underground soil purification system which concerns on 3rd embodiment was applied. It is a longitudinal cross-sectional view equivalent to FIG. 3 which shows the utilization example of the heat exchange well of the underground soil purification system which concerns on 3rd embodiment.

(First embodiment)
First, the first embodiment will be described.

(Underground soil purification system)
FIG. 1 shows an example of the ground 12 to which the underground soil purification system 10 according to the present embodiment is applied. The ground 12 has a hardly permeable layer 12A and an aquifer 12B deposited on the hardly permeable layer 12A. In addition, the code | symbol S shown by FIG. 1 has shown the groundwater level of the aquifer 12B. Moreover, the arrow V shown by FIG. 1 has shown the flow of groundwater.

  The aquifer 12B has higher water permeability than the poorly permeable layer 12A, and the groundwater easily flows. The aquifer 12B has a contaminated soil 12B1 containing a contaminant such as VOC (volatile organic compound).

  Contaminants include, for example, organic compounds (toluene, xylene, tetrachloroethylene, trichloroethylene, cis-1,2-dichloroethylene, chloroethylene (vinyl chloride) contained in paints, printing inks, adhesives, cleaning agents, gasoline, thinner, etc. Volatile organic compounds) such as monomers), heavy metal compounds, inorganic compounds, oils and the like.

  In addition, the underground soil purification system 10 which concerns on this embodiment is applicable not only to said ground 12, but various grounds, such as the ground 12 in which the poorly permeable layer 12A does not exist, for example. Moreover, in this embodiment, although the structure 11 is stood on the ground 12, the underground soil purification system 10 can also be applied to the ground 12 before the structure 11 is stood.

  The underground soil purification system 10 employs a biomethod (biostimulation). In the biomethod, for example, an active agent liquid to which an active agent (nutrient) such as a hydrogen sustained-release agent or a yeast extract is added is injected into the ground 12 from the injection well 16 to decompose the pollutants in the contaminated soil 12B1. In this method, microorganisms (hereinafter referred to as “decomposing microorganisms”) are grown and activated to promote the purification of contaminants by the decomposing microorganisms.

  Moreover, in the underground soil purification system 10, the warming liquid heated to high temperature rather than the groundwater (room temperature groundwater) in the aquifer 12B is inject | poured into the aquifer 12B. As a result, the decomposing microorganisms present in the contaminated soil 12B1 are propagated and activated, and the contaminants are easily separated from the contaminated soil 12B1, thereby improving the purification efficiency of the contaminated soil 12B1.

  The underground soil purification system 10 includes a water shielding wall 14, an injection well 16, a pumping well 18, an observation well 20, a temperature detection unit 22, a water treatment device 30, an activator liquid generation unit 40, and an activator. The liquid control part 48, the warming liquid production | generation part 50, and the warming liquid control part 58 are provided.

(Impermeable wall)
The impermeable wall 14 is formed in the aquifer 12B by, for example, concrete or ground improvement. The impermeable wall 14 is formed in a frame shape in plan view so as to surround the contaminated soil 12B1. This impermeable wall 14 penetrates the aquifer 12B, and its lower end is embedded in the hardly permeable layer 12A. This prevents the diffusion of groundwater contaminated with the contaminated soil 12B1. The impermeable wall 14 may be provided as necessary, and can be omitted as appropriate.

(Injection well and pumping well)
The injection well 16 is disposed on one end side of a region (soil) partitioned by the water shielding wall 14. On the other hand, the pumping well 18 is disposed on the other end side of the region (soil) partitioned by the impermeable wall 14. The injection well 16 and the pumping well 18 are formed by excavating the ground 12.

  Each injection well 16 and pumping well 18 penetrates the aquifer 12B of the ground 12 and reaches the hardly permeable layer 12A. The activator solution and the warming solution supplied from the injection well 16 to the ground 12 pass through the contaminated soil 12B1 and are pumped from the pumping well 18 as indicated by the arrow V.

  In addition, the number, arrangement | positioning, and length of the injection well 16 and the pumping well 18 can be suitably changed according to the range of the contaminated soil 12B1 used as purification object. Moreover, the injection well 16 and the pumping well 18 do not necessarily need to reach the hardly permeable layer 12A.

(Observation well)
The observation well 20 is formed by excavating the ground 12. The observation well 20 is provided in a region partitioned by the impermeable wall 14. Moreover, the observation well 20 is provided in the contaminated soil 12B1. The observation well 20 is a well for observing (detecting) the concentration of pollutants in the groundwater, the concentration of the activator, and the like.

  For example, a pumping pipe (not shown) is provided inside the observation well 20, and groundwater of the contaminated soil 12 </ b> B <b> 1 is pumped up by operating the pump provided in the pumping pipe. The concentration of the active agent and the like in the groundwater pumped up is measured by a concentration measuring device or the like.

  It is also possible to measure the concentration of the activator or the like in the groundwater with a concentration measuring device or the like provided inside the observation well 20. It is also possible to estimate the concentration of the activator by adding an indicator material such as a fluorescent dye to the activator solution and measuring the concentration of the indicator material.

(Temperature detector)
The temperature detection part 22 is implement | achieved by the temperature sensor etc., for example. The temperature detection unit 22 is embedded in the contaminated soil 12B1 and detects the temperature of groundwater in the contaminated soil 12B1. The temperature detection unit 22 is electrically connected to a warming liquid control unit 58 described later.

  In addition, the temperature detection part 22 can be provided not only in the contaminated soil 12B1, but in the area | region enclosed by the impermeable wall 14, for example. Moreover, the temperature detection part 22 can be provided in the observation well 20, for example. Furthermore, the temperature detector 22 may detect the temperature of groundwater pumped from the observation well 20.

(Water treatment equipment)
The water treatment device 30 includes, for example, a filtration device that filters groundwater pumped from the pumping well 18. A pumping well 18 is connected to the water treatment device 30 via a pipe 26. The piping 26 is provided with a pumping pump 28, and when the pumping pump 28 is operated, the groundwater pumped from the pumping well 18 is supplied to the water treatment device 30. The pumping pump 28 may be provided inside the pumping well 18.

  The groundwater supplied to the water treatment device 30 is water-treated by the water treatment device 30 to remove contaminants and the like. The water treatment device 30 is connected to an activator liquid generation unit 40 via a pipe 32 and to a warming liquid generation unit 50 via a pipe 34. The groundwater (treated water) treated by the water treatment device 30 is supplied to the activator liquid generation unit 40 via the pipe 32 and to the warming liquid generation part 50 via the pipe 34. .

(Activator solution generator)
The activator liquid generation unit 40 includes an activator adjustment tank 42 and an addition device 44 that adds the activator to the activator adjustment tank 42. The activator adjustment tank 42 is a storage tank that temporarily stores the groundwater supplied from the water treatment device 30. The adding device 44 includes a storage unit that stores the activator and an addition amount adjusting unit that increases or decreases the amount of the activator added to the activator adjusting tank 42. By adding the activator to the groundwater stored in the activator adjusting tank 42 by the adding device 44, an activator liquid having a predetermined concentration is generated. Note that an activator liquid control unit 48 described later is electrically connected to the adding device 44.

  The injection well 16 is connected to the activator adjusting tank 42 through a pipe 45. This pipe 45 is provided with an activator liquid injection pump 46. When the activator solution injection pump 46 is operated, the additive solution in the activator adjustment tank 42 is injected from the injection well 16 into the ground (soil) 12. Further, an activator solution control unit 48 described later is electrically connected to the activator solution injection pump 46.

(Activator solution control unit)
The activator liquid control unit 48 operates the adding device 44 and the activator liquid injection pump 46 so that the concentration of the activator in the contaminated soil 12B1 (the concentration of the activator in the groundwater in the contaminated soil 12B1) becomes a predetermined value. Control. An addition device 44 and an activator solution injection pump 46 are electrically connected to the activator solution controller 48. In addition, operation | movement of the activator liquid control part 48 is mentioned later with the purification method of contaminated soil.

(Warming liquid generator)
The heating liquid generator 50 includes a heating tank 52 and a heating device 54. The heating tank 52 is a storage tank that temporarily stores the groundwater supplied from the water treatment device 30. For example, an electric heater or a gas boiler is used for the heating device 54. By heating the groundwater stored in the heating tank 52 to a predetermined temperature by the heating device 54, a heating liquid is generated. That is, in this embodiment, a heating liquid is produced | generated separately from an activator liquid. Moreover, the heating apparatus 54 heats the groundwater in the heating tank 52 so that the decomposition microorganisms in the contaminated soil 12B1 can be easily grown and activated (for example, 25 ° C. to 60 ° C.).

  The heating device 54 is electrically connected to a heating liquid control unit 58 described later. In addition, for the heating device 54, for example, exhaust heat discharged from an air conditioner or factory equipment installed on a structure standing on the ground 12 can be used. In this case, the groundwater in the heating tank 52 is heated by the exhaust heat discharged from the air conditioner, factory equipment, or the like. For the heating device 54, for example, a cogeneration system can be used. In this case, the groundwater in the heating tank 52 is heated by the exhaust heat of the cogeneration system.

  The injection well 16 is connected to the heating tank 52 via a pipe 55. The piping 55 is provided with a warming liquid injection pump 56. By operating the warming liquid injection pump 56, the warming liquid in the warming tank 52 is injected from the injection well 16 into the ground (soil) 12.

  It is also possible to omit the heating tank 52 and heat the groundwater flowing through the pipe 55 to a predetermined temperature by the heating device 54.

(Warming liquid control unit)
The warming liquid control unit 58 controls the operation of the warming device 54 and the warming liquid injection pump 56 so that the temperature of the groundwater in the contaminated soil 12B1 becomes a predetermined value. The warming liquid controller 58 is electrically connected with a warming device 54 and a warming liquid injection pump 56. In addition, operation | movement of the activator liquid control part 48 is mentioned later with the purification method of contaminated soil.

(Purification method of contaminated soil)
Next, an example of the contaminated soil purification method by the underground soil purification system according to the first embodiment will be described.

(Operation of underground soil purification system)
First, the overall operation of the underground soil purification system 10 will be described. In the underground soil purification system 10, the activator liquid generated by the activator liquid generation unit 40 is injected into the ground 12 from the injection well 16, and the warming liquid generated by the warming liquid generation unit 50 is injected into the injection well 16. Is injected into the ground 12.

  The activator solution and the warming solution injected into the ground 12 are supplied to the contaminated soil 12B1 as indicated by the arrow V. And the groundwater which passed contaminated soil 12B1 is pumped from the pumping well 18. Further, the groundwater pumped from the pumping well 18 is supplied to the water treatment device 30 through the pipe 26 and is water-treated by the water treatment device 30. Further, the groundwater treated by the water treatment device 30 is supplied to the activator liquid generation unit 40 via the pipe 32 and is also supplied to the warming liquid generation part 50 via the pipe 34.

  The activator liquid production | generation part 40 adds the activator mentioned above to the groundwater water-treated by the water treatment apparatus 30, and produces | generates the activator liquid of a predetermined density | concentration. This activator solution is injected again from the injection well 16 into the contaminated soil 12B1. On the other hand, the warming liquid production | generation part 50 heats the groundwater water-treated by the water treatment apparatus 30, and produces | generates the warming liquid of predetermined temperature. This warming solution is again injected from the injection well 16 into the contaminated soil 12B1.

  As described above, in the underground soil purification system 10 according to the present embodiment, the contaminated soil 12B1 is circulated while circulating the groundwater between the contaminated soil 12B1 and the water treatment device 30, the activator liquid generation unit 40, and the warming liquid generation unit 50. To purify.

(Operation of activator solution control unit)
Next, the operation of the activator solution controller 48 will be described. The activator solution controller 48 controls the operation of the adding device 44 and the activator solution injection pump 46 so that the concentration of the activator in the contaminated soil 12B1 becomes a predetermined value.

  Specifically, the activator liquid control unit 48 activates the adding device 44 when the concentration of the activator in the groundwater observed in the observation well 20 is less than a predetermined value, and enters the activator adjustment tank 42 into the activator adjustment tank 42. Is added to generate an activator solution, and the activator solution infusion pump 46 is operated. Thereby, the activator liquid having a predetermined concentration generated in the activator adjusting tank 42 is injected into the ground 12 from the injection well 16. At this time, the pumping pump 28 may be stopped and the pumping of groundwater from the pumping well 18 may be stopped as appropriate.

  On the other hand, the activator solution controller 48 stops the adding device 44 and the activator solution injection pump 46 when the concentration of the activator in the groundwater observed in the observation well 20 is equal to or higher than a predetermined value. Thereby, injection | pouring of the activator liquid from the injection well 16 to the ground 12 is stopped.

  Here, when the activator is injected into the contaminated soil 12B1, the decomposing microorganisms in the contaminated soil 12B1 are propagated and activated, and the purification of the contaminants by the decomposing microorganisms is promoted. Therefore, the purification efficiency of the contaminated soil 12B1 is increased.

  In this embodiment, the concentration of the active agent in the contaminated soil 12B1 is maintained at a predetermined value (predetermined range) by the active agent liquid control unit 48. Therefore, the purification efficiency of the contaminated soil 12B1 is further enhanced.

(Operation of heating liquid control unit)
Next, the operation of the warming liquid control unit 58 will be described. The warming liquid control unit 58 controls the operation of the warming device 54 and the warming liquid injection pump 56 so that the temperature of the groundwater in the contaminated soil 12B1 becomes a predetermined value.

  Specifically, the heating liquid control unit 58 operates the heating device 54 when the temperature of the groundwater in the contaminated soil 12B1 detected by the temperature detection unit 22 is less than a predetermined value, The groundwater is heated to generate a warming liquid having a predetermined temperature, and the warming liquid injection pump 56 is operated. Thereby, the heating liquid of the predetermined temperature produced | generated in the heating tank 52 is inject | poured into the ground 12 from the injection well 16. FIG.

  On the other hand, the warming liquid control unit 58 stops the warming device 54 and the warming liquid injection pump 56 when the temperature of the groundwater in the contaminated soil 12B1 detected by the temperature detection unit 22 is equal to or higher than a predetermined value. Thereby, injection of the heating liquid from the injection well 16 to the ground 12 is stopped. At this time, the pumping pump 28 may be stopped and the pumping of groundwater from the pumping well 18 may be stopped as appropriate.

  Here, when the warming liquid is injected into the contaminated soil 12B1, the decomposing microorganisms in the contaminated soil 12B1 are propagated and activated, and the contaminants are easily separated from the contaminated soil 12B1. Therefore, the purification efficiency of the contaminated soil 12B1 is increased.

  Moreover, in this embodiment, the temperature of the groundwater in the contaminated soil 12B1 is maintained at a predetermined value (predetermined range) by the heating liquid control unit 58. Therefore, the purification efficiency of the contaminated soil 12B1 is further enhanced.

(effect)
Next, effects of the first embodiment will be described.

  The underground soil purification system 10 according to the present embodiment includes an activator liquid generation unit 40 and a warming liquid generation unit 50. This warming liquid production | generation part 50 produces | generates a heating liquid separately from an activator liquid. That is, the warming liquid generator 50 does not warm the activator liquid. Thereby, activation of the microorganisms in an activator liquid is suppressed. As a result, the production of biofilm or the like that causes clogging of the injection well 16 is suppressed. Therefore, clogging of the injection well 16 is suppressed.

  The activator liquid generation unit 40 is controlled by the activator liquid control unit 48, and the warming liquid generation unit 50 is controlled by the warming liquid control unit 58. That is, the activator liquid generation unit 40 and the warming liquid control unit 58 are controlled separately. Thereby, in this embodiment, irrespective of the temperature of the ground water of contaminated soil 12B1, only an activator liquid can be inject | poured into contaminated soil 12B1. Therefore, the concentration of the activator in the contaminated soil 12B1 can be adjusted efficiently.

  Similarly, in this embodiment, only the warming liquid can be injected into the contaminated soil 12B1 regardless of the concentration of the active agent in the contaminated soil 12B1. Therefore, the temperature of the groundwater in the contaminated soil 12B1 can be adjusted efficiently.

  Moreover, in this embodiment, the activator liquid produced | generated by the activator liquid production | generation part 40 and the warming liquid produced | generated by the warming liquid production | generation part 50 are inject | poured into the ground 12 from the same injection well 16. FIG. Therefore, the number of the injection wells 16 is reduced as compared with the case where the activator liquid and the warming liquid are injected from the separate injection wells 16 into the ground 12. Therefore, the construction cost of the injection well 16 can be reduced.

  Furthermore, in the warming liquid production | generation part 50, energy saving can be achieved by producing | generating a warming liquid by the waste heat discharged | emitted from an air conditioning, a factory facility, etc. or the waste heat of a cogeneration system.

(Second embodiment)
Next, a second embodiment will be described. Note that in the second embodiment, members having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  FIG. 2 shows an underground soil purification system 60 according to the second embodiment. The underground soil purification system 60 includes an activator liquid injection well 62 and a warming liquid injection well 64. An activator adjustment tank 42 (activator solution generator 40) is connected to the activator solution injection well 62 through a pipe 45. The additive liquid is injected into the ground 12 from the activator liquid injection well 62.

  The warming liquid injection well 64 is disposed closer to the contaminated soil 12B1 and the pumping well 18 than the activator liquid injection well 62 is. In addition, a heating tank 52 (warming liquid generator 50) is connected to the warming liquid injection well 64 via a pipe 55. The warming liquid is poured into the ground 12 from the warming liquid injection well 64.

(Function)
Next, the operation of the second embodiment will be described. In addition, since the purification method of the contaminated soil by the underground soil purification system which concerns on 2nd embodiment is the same as that of 1st embodiment, description is abbreviate | omitted suitably.

  According to the underground soil purification system 60 according to the present embodiment, the activator liquid generated by the activator liquid generating unit 40 is injected into the ground 12 from the activator liquid injection well 62. On the other hand, the warming liquid generated by the warming liquid generating unit 50 is injected into the ground 12 from the warming liquid injection well 64.

  Thereby, since the temperature rise in the activator liquid injection well 62 due to the warming liquid is suppressed, clogging of the activator liquid injection well 62 is further suppressed.

  Further, the warming liquid injection well 64 is disposed closer to the contaminated soil 12B1 and the pumping well 18 than the activator liquid injection well 62. In other words, the activator liquid injection well 62 is disposed on the opposite side to the contaminated soil 12B1 and the pumping well 18 with respect to the warming liquid injection well 64. Thereby, it is suppressed that the activator liquid injection well 62 is heated by the warming liquid which flows from the warming liquid injection well 64 to the contaminated soil 12B1 and the pumping well 18 side. Therefore, clogging of the activator liquid injection well 62 is further suppressed.

  In addition, arrangement | positioning of the activator liquid injection well 62 and the warming liquid injection well 64 can be changed suitably, for example, even if the activator liquid injection well 62 is arrange | positioned in the pumping well 18 side rather than the warming liquid injection well 64. good. Moreover, you may arrange | position the activator liquid injection well and the warming liquid injection well side by side in the paper surface depth direction of FIG.

  A plurality of warming liquid injection wells 64 may be provided in the contaminated soil 12B1 as in a heat exchange well 72 (see FIG. 3) in a third embodiment to be described later.

(Third embodiment)
Next, a third embodiment will be described. Note that in the third embodiment, members having the same configurations as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  FIG. 3 shows an underground soil purification system 70 according to the third embodiment. The underground soil purification system 70 includes a plurality of heat exchange wells 72. The plurality of heat exchange wells 72 are formed by excavating the ground 12. These heat exchange wells 72 are provided in the contaminated soil 12B1 at intervals.

  In the heat exchanging well 72, a heat exchanging tube 74 as a heat exchanging portion is provided. The heat exchange tube 74 is a U-shaped tube that is folded back in the heat exchange well 72. One end portion of the heat exchange tube 74 is connected to the heating tank 52 of the heating liquid generating unit 50 via the feed pipe 80. The other end of the heat exchange tube 74 is connected to the heating tank 52 of the heated liquid generating unit 50 via a return pipe 82.

  The feed pipe 80 and the return pipe 82 form a circulation channel for circulating the warming liquid between the heat exchange tube 74 and the warming liquid generating unit 50. Further, the feed pipe 80 is provided with a circulation pump 81 for circulating the warming liquid. A heating liquid control unit 58 is electrically connected to the circulation pump 81. The operation of the circulation pump 81 and the warming liquid generating unit 50 is controlled by the warming liquid control unit 58.

  In addition, although the pumping well 18 is not connected to the heating liquid production | generation part 50 in this embodiment, the pumping well 18 can also be connected.

(Function)
Next, the operation of the third embodiment will be described. In addition, since the purification method of the contaminated soil by the underground soil purification system which concerns on 3rd embodiment is the same as that of 1st embodiment, description is abbreviate | omitted suitably.

  According to the underground soil purification system 70 according to the present embodiment, the plurality of heat exchange wells 72 are provided with heat exchange tubes 74. A heating liquid generator 50 is connected to these heat exchange tubes 74 via a feed pipe 80 and a return pipe 82.

  The heat exchange tube 74 is supplied with the warming liquid generated by the warming liquid generating unit 50 via the feed pipe 80. The heat exchange tube 74 exchanges heat between the warmed liquid supplied from the warmed liquid generating unit 50 and the contaminated soil 12B1. As a result, the groundwater in the contaminated soil 12B1 is heated by the heat of the heating liquid.

  Thus, in this embodiment, ground water in the contaminated soil 12B1 is heated while circulating the heating liquid between the heating liquid generating unit 50 and the heat exchange tube 74. As a result, as in the first embodiment, the decomposing microorganisms in the contaminated soil 12B1 are propagated and activated, and the contaminants are easily separated from the contaminated soil 12B1. Therefore, the purification efficiency of the contaminated soil 12B1 is increased.

  In addition, the warming liquid whose temperature has been reduced by heat exchange with the contaminated soil 12B1 in the heat exchange tube 74 is returned to the warming liquid generation unit 50 via the return pipe 82, and is brought to a predetermined temperature by the warming liquid generation unit 50. It is warmed.

  Here, for example, when the warming liquid is injected into the ground 12 from the injection well 16 as in the first embodiment, the warming liquid is diffused into the ground 12. Therefore, the ground 12 can be heated over a wide range.

  On the other hand, in this embodiment, heat is exchanged between the heated liquid and the contaminated soil 12B1 in the heat exchange tube 74. Thereby, the ground water in the contaminated soil 12B1 can be locally heated. Therefore, the predetermined part of the contaminated soil 12B1 can be efficiently heated.

  Further, as shown in FIG. 4, the plurality of heat exchange wells 72 can be utilized (converted) to, for example, a geothermal heat utilization system 90 that utilizes geothermal heat after the contaminated soil 12B1 is purified.

  Specifically, a heat pump 92 is connected to the heat exchange tube 74 via a feed pipe 80 and a return pipe 82. Further, for example, an air conditioner 94 of the structure 11 is connected to the heat pump 92. The heat pump 92 pumps heat (cold heat or hot heat) from the fluid exchanged with the ground 12 in the heat exchange tube 74 and supplies the pumped air to the air conditioner 94. Thereby, the underground heat of the ground 12 can be utilized.

  In the geothermal heat utilization system 90 shown in FIG. 4, the closed loop system is used, but an open loop system may be used.

(Modification)
Next, a modification of the above embodiment will be described. In the following, various modified examples will be described by taking the first embodiment as an example, but these modified examples are also applicable to the second embodiment and the third embodiment as appropriate.

  In said 1st embodiment, although biostimulation was used as a biomethod, it is not restricted to this. For example, you may use the bioaugmentation which inject | pours the microorganisms cultured outside with the active agent etc. into the contaminated ground 12B1.

  Moreover, in the said 1st embodiment, although the pumping well 18 is provided in the ground 12, the said embodiment is not restricted to this. The pumping well 18 may be provided as necessary and can be omitted as appropriate.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

10 Underground soil purification system 12 Ground (soil)
12B1 Contaminated soil (soil)
16 Injection well 40 Activating agent liquid generating part 50 Warming liquid generating part 58 Warming liquid control part 60 Underground soil purification system 62 Activating agent liquid injection well 64 Heating liquid injection well 70 Underground soil purification system 74 Heat exchange tube (heat exchange Part)

Claims (4)

An activator liquid generating unit that generates an activator liquid to which an activator that activates decomposing microorganisms that decompose soil pollutants is added;
Separately from the activator liquid, a warming liquid generating unit that generates a warmed warming liquid,
An injection well for injecting the activator solution and the warming solution into the soil;
Underground soil purification system. An activator liquid generating unit that generates an activator liquid to which an activator that activates decomposing microorganisms that decompose soil pollutants is added;
Separately from the activator liquid, a warming liquid generating unit that generates a warmed warming liquid,
An activator solution injection well for injecting the activator solution into the soil;
A warming liquid injection well for pouring the warming liquid into the soil;
Underground soil purification system. An activator liquid generating unit that generates an activator liquid to which an activator that activates decomposing microorganisms that decompose soil pollutants is added;
Separately from the activator liquid, a warming liquid generating unit that generates a warmed warming liquid,
An injection well for injecting the activator solution into the soil;
A heat exchanging unit provided in the soil for exchanging heat between the soil and the heating liquid;
Underground soil purification system. The warming liquid generator generates the warming liquid by exhaust heat of the cogeneration system.
The underground soil purification system of any one of Claims 1-3.