JP2014205086A - Purification equipment for contaminated soil and method for purifying contaminated soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the purification efficiency of contaminated soil.SOLUTION: At the summer season, by making ground water into hot water H via a heat medium and a heat exchanger 70 using waste heat emitted from an air conditioner and pouring the same into an aquifer 12, the purification efficiency of contaminated soil 20 improves compared with purification with ordinary temperature water G. Further, by storing waste heat (warm heat-cool heat) emitted from the air conditioner 60 in the ground, the energy efficiency of the whole obtained by totaling the purification of the contaminated soil 20 and the air conditioning of the air conditioner 60 is increased.

Description

  The present invention relates to a contaminated soil purification facility and a contaminated soil purification method.

  Patent Document 1 discloses a technique related to a method for manufacturing a cooling and heating facility for a building built on a flat ground. In this prior art, a large number of vertical columnar heat exchange tubes are embedded in the periphery of the hole for the artificial pond, and a heat pump having a refrigerant circulating in a closed circuit consisting of an evaporator, a compressor, a condenser, and an expansion valve is installed. A columnar heat exchange cylinder, a primary antifreeze liquid circulation path that circulates in the evaporator, a condenser, and a secondary antifreeze liquid circulation path that circulates in the heat exchange indoor unit are provided.

  Patent Document 2 discloses a technique related to equipment using geothermal heat in a soil-contaminated area. In this prior art, an evaporator, a compressor, and a condenser are disposed between a primary side heat exchanger having a heat collecting pipe and a first circulation path, and a secondary side heat exchanger having a heat radiation pipe and a second circulation path. And a heat pump with an expansion valve, burying the heat collection pipe horizontally or vertically in the soil-contaminated area, collecting ground heat with the first heat medium circulating inside, and raising the temperature with the heat pump, then the heat The heat is radiated from the heat radiating pipe by the second heat medium circulating inside.

  Patent Document 3 discloses a technique related to an in-situ purification method for contaminated soil and / or groundwater. In this prior art, a cleaning agent having a melting point equal to or higher than that of soil and / or groundwater is heated to liquefy and injected into contaminated soil and / or groundwater with volatile organochlorine compounds or nitrate nitrogen. It penetrates and diffuses into the middle and / or groundwater and solidifies as the temperature drops.

  In addition, related techniques are described in Patent Documents 4 to 8.

  Here, the temperature of groundwater is around 18 ° C. throughout the year. Therefore, in the purification of contaminated soil, it is difficult to improve the elution degree of the pollutant into the ground water, the activity of microorganisms that decompose the pollutant, and the like, and there has been a limit to improving the purification efficiency.

Japanese Patent No. 3999591 JP 2003-343929 A JP 2004-216220 A JP-A-9-098770 JP 2010-000454 A Japanese Patent No. 4176383 Patent No. 4428125 Japanese Patent No. 4428638

  An object of the present invention is to improve the purification efficiency of contaminated soil.

  The invention of claim 1 includes a purification well device that pumps groundwater containing pollutants from an aquifer, purifies the pumped groundwater with a purifier, and pours the groundwater into the aquifer, and the pumped groundwater and heat A heat exchanger for exchanging heat with the medium; and utilization means for utilizing the heat energy of the heat medium exchanged with the heat exchanger and sending the heat medium to the heat exchanger after use. ing.

  In the first aspect of the present invention, the groundwater containing the polluted pumped water is purified by the purifier and heat-exchanged with the heat medium by the heat exchanger and poured into the aquifer. Moreover, while using the heat medium heat-exchanged with groundwater by a utilization means, it is sent to a heat exchanger after utilization and heat-exchanges with groundwater as mentioned above.

  In this way, for example, pollutants are effectively eluted by pumping the groundwater that has been pumped into the aquifer through heat exchange with a heat medium using a heat exchanger to make warm water. Alternatively, pollutants are effectively decomposed by microorganisms. Therefore, the purification efficiency of pollutants is improved (purification is promoted) as compared with the case of purifying with room temperature groundwater.

  In addition, by using the exhaust heat generated from the utilization means, the overall energy efficiency of the purification and utilization means of the contaminated soil is improved compared to the case where the purification of the contaminated soil and the utilization means are performed by separate devices. It is done.

  In the invention of claim 2, the utilization means is an air conditioner, and the purification well device injects hot water into the aquifer in the summer to store heat, and injects cold water into the aquifer in the winter. It is configured to store heat.

  In the second aspect of the invention, the heat medium whose temperature has been increased by an air conditioner that cools in summer is stored by injecting water into the aquifer using ground heat as a warm water in a heat exchanger, and pumping the warm water in winter. The temperature of the heat medium is raised with a heat exchanger and used for heating.

  In addition, in the winter season, the heat medium whose temperature has been lowered by the air conditioner that heats up is stored in the aquifer using ground heat as cold water in the heat exchanger, and in the summer, the cold water is pumped and stored in the heat exchanger. Reduce the temperature and use it for cooling.

  Thus, the heat energy of the heat medium exchanged with the groundwater by the heat exchanger is effectively used throughout the year. Moreover, the energy efficiency which combined purification of the contaminated soil and an air conditioner can be improved.

  According to a third aspect of the present invention, the aquifer containing pollutants is divided into a plurality of layers in the ground by a hardly permeable layer, and the purification well device controls a flow rate of water injection and pumping for each aquifer. The heat exchanger is configured to exchange heat with the groundwater pumped from a plurality of the aquifers, and a temperature difference between the groundwaters pumped from the aquifers is small. In this way, first control means for controlling the flow rate is provided for each aquifer.

  In the invention described in claim 3, the first control means controls the flow rate of the water injection and pumping for each aquifer so that the temperature difference of the groundwater pumped from each aquifer is reduced. Therefore, heat loss due to the temperature difference is suppressed in the pumped-up groundwater, and the conversion efficiency of heat exchange by the heat exchanger is improved.

  According to a fourth aspect of the invention, there is provided second control means for controlling the flow rate of the heat medium that exchanges heat with the heat exchanger according to the flow rate of the pumped groundwater.

  In the invention according to claim 4, the utilization efficiency of the heat energy is improved by the utilization means by controlling the flow rate of the liquid to be heat exchanged by the heat exchanger according to the flow rate of the pumped ground water by the second control means. .

  The invention of claim 5 is a purification well device for pumping groundwater containing pollutants from an aquifer, purifying the pumped groundwater with a purifier, and pouring the groundwater into the aquifer, and the pumped groundwater and heat A heat exchanger that exchanges heat with the medium, and a utilization means that uses heat energy of the heat medium that has undergone heat exchange, and pumps the groundwater stored in the aquifer. A hot water injection step of exchanging heat with the heat medium in the heat exchanger to inject water into the aquifer, and pumping up the ground water stored in the aquifer to pump the ground water in the heat exchanger. A cold water injection process in which heat is exchanged with the heat medium to form cold water and poured into the aquifer is intermittently performed at intervals.

  In invention of Claim 5, ground water containing the polluted water pumped up is purified with a purification device, and heat exchange with a heat medium is carried out with a heat exchanger, and water is poured into the aquifer. In addition, the heat medium exchanged with the groundwater is used by the utilization means, and is sent to the heat exchanger after use and exchanged with the groundwater as described above.

  Thus, for example, pollutants are effectively eluted by storing warm water in the aquifer. Alternatively, pollutants are effectively decomposed by microorganisms. Therefore, the purification efficiency of pollutants is improved (purification is promoted) as compared with the case of purifying with room temperature groundwater.

  In addition, hot water is injected into the aquifer in the hot water injection process and stored, and the hot water stored in the cold water injection process is pumped and used in the utilization means by exchanging heat with the heat medium in the heat exchanger. The groundwater that has become cold water by heat exchange with water is poured into the aquifer and stored. Then, the cold water stored in the hot water injection process is pumped, and heat is exchanged with the heat medium in the heat exchanger and used in the utilization means, and the ground water that has been warmed by the heat exchange with the heat medium is used in the aquifer Water is stored in the tank.

  In this way, the hot water injection process and the cold water injection process are intermittently performed at intervals, thereby storing the exhaust heat (heat and cold) from the utilization means as ground water (hot and cold) in the ground. Compared to the case where the purification of contaminated soil and the utilization means are performed by separate devices, the overall energy efficiency of the combined purification and utilization means of the contaminated soil is enhanced.

  Invention of Claim 6 purifies the ground water made warm by exchanging heat with the heat exchanger in the hot water injection process with the purification device, and in the cold water injection process, The said groundwater which pumped up the stored warm water is purified with the said purification apparatus.

  In invention of Claim 6, the purification efficiency in a purification apparatus improves by purifying the groundwater made into warm water by exchanging heat with a heat exchanger, or the groundwater of the pumped warm water with a purification apparatus.

  According to the present invention, the purification efficiency of contaminated soil can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows typically the structure of the purification equipment of the contaminated soil which concerns on 1st embodiment of this invention, and shows purification of the contaminated soil in the summer. It is a block diagram corresponding to FIG. 1 which shows typically purification | cleaning of the contaminated soil in winter. It is a block diagram which shows typically the structure of the purification facility of the contaminated soil which concerns on 2nd embodiment of this invention, and shows purification | cleaning of the contaminated soil in summer. It is a block diagram corresponding to FIG. 3 which shows typically purification | cleaning of the contaminated soil in winter. It is a block diagram which shows typically the structure of the principal part of the well of the purification equipment of 2nd embodiment. It is process drawing which shows the mode of purification of the contaminated soil in summer in order from (A) to (B). It is process drawing which shows the mode of purification of the contaminated soil in winter in order from (A) to (B).

<First embodiment>
The purification equipment of the contaminated soil which concerns on 1st embodiment of this invention is demonstrated.

[soil]
As shown in FIGS. 1 and 2, the aquifer 12 is below the groundwater level S in the ground 10. In the aquifer 12, contaminated soil 20 containing pollutants is present. Contaminants include organic compounds typified by trichlorethylene and benzene, metal compounds such as hexavalent chromium and arsenic, inorganic compounds such as cyan, and mineral oils typified by gasoline and light oil.

  Below the aquifer 12 is a hardly permeable layer 14 that is less permeable than the aquifer 12. On the ground 10, a structure such as an office building or a commercial facility (not shown) is built. In addition, the ground without the hardly water-permeable layer 14 may be sufficient.

[Purification equipment]
The purification facility 100 includes a water shielding wall 50, a purification well device 110, a heat exchanger 70, an air conditioner 60, and a control device 80.

  The impermeable wall 50 is formed so as to surround the periphery of the contaminated soil 20. Further, the lower end portion 50 </ b> A is embedded in the hardly water-permeable layer 14. Therefore, the contaminated soil 20 is surrounded and closed by the impermeable wall 50 and the hardly permeable layer 14.

  The purification well device 110 has a purification device 112 and two wells 120 and 122. The two wells 120 and 122 are arranged at an interval so that the contaminated soil 20 is sandwiched between the inner sides surrounded by the impermeable wall 50.

  These two wells 120 and 122 are connected by a groundwater line 124, and a purification device 112 is installed in the groundwater line 124. Then, as shown in FIG. 1, the purification well device 110 is pumped from one well 120 by a pump or a valve (not shown), and after purifying the groundwater containing the pumped contaminants with the purification device 112, the other The water can be poured from the well 122. Further, as shown in FIG. 2, the purification well device 110 may pump water from the other well 122, purify the groundwater containing the polluted water with the purification device 112, and then pour water from the other well 120. It is configured as possible. That is, these two wells 120 and 122 are configured to perform pumping and water injection, respectively.

  Various known techniques can be applied to the purification method in the purification device 112. For example, a method to improve the water quality by sending air to volatilize volatile pollutants, a method to improve water quality by adding a purifier and reacting, a method to separate groundwater and pollutants by adsorbing pollutants, etc. Can be applied.

  In addition, a cleaning agent may be added to the groundwater pumped to purify the contaminated soil 20 and water may be poured from the wells 120 and 122. Or when performing biological purification, you may pour water after mixing a nutrient salt and oxygen, or you may pour water by mixing a microorganism newly.

  The heat exchanger 70 performs heat exchange between the groundwater flowing through the groundwater line 124 and the heat medium flowing through the heat medium line 72. In this embodiment, water is used as the heat medium. However, any medium that can exchange heat may be used. For example, a fluid such as oil or gas may be used. The heat medium is circulated through the heat medium line 72 by a pump or the like (not shown).

  The air conditioner 60 performs air conditioning in a structure such as an office building or a commercial facility (not shown) built on the ground 10. The air conditioner 60 is configured to be able to use the heat energy (hot and cold) of the heat exchanged heat medium circulating in the heat medium line 72. The air conditioner 60 is configured to be able to air-condition the structure using energy other than the heat energy of the heat medium circulating in the heat medium line 72 at the same time.

  Here, the arrows in FIGS. 1 and 2 indicate the flow of groundwater in the aquifer 12, the flow of groundwater in the groundwater line 124, the flow of heat medium in the heat medium line 72, and the flow of air in the air conditioner 60. Each flow is shown. Also, as will be described later, the directions of these arrows are reversed in FIGS.

  The control device 80 controls the operation of pumps and valves (not shown) of the groundwater line 124 to switch between water injection and pumping in the well 120 and the well 122 (switching the direction of flowing through the groundwater line 124) and water injection. Control the amount of water injection and pumping. Further, the control device 80 controls a pump (not shown) of the heat medium line 72 and the like, and controls the direction in which the heat medium circulates through the heat medium line 72 and the flow velocity (flow rate per unit time).

  In the contaminated soil 20, a measuring instrument 82 for measuring the state of groundwater containing the pollutant is embedded. The measuring device 82 measures the pressure of groundwater flowing through the aquifer 12, the concentration of contaminants and purifiers in the groundwater, the quality of water such as dissolved oxygen, the temperature of groundwater, and the like. Further, the measurement result is sent to the control device 80. In FIG. 1 and FIG. 2, the measuring instrument 82 is provided at only one location (although illustrated), it may be provided at a plurality of locations.

<Action and effect>
Next, the effects of the present embodiment will be described while explaining a method for purifying contaminated soil. In the following, soil contamination purification starts in the summer, but is not limited thereto.

  FIG. 6A shows a state before purifying groundwater containing contaminants in the aquifer 12 surrounded by the impermeable wall 50. In addition, the temperature of groundwater at this time is the normal temperature water G of normal temperature (12 degreeC-20 degreeC). As will be described later, the symbol C means cold water having a temperature lower than that of the normal temperature water G, and the symbol H means hot water having a temperature higher than that of the normal temperature water G. The water temperature of the hot water H is not particularly limited as long as it is higher than that of the normal temperature water G, but in the present embodiment, it is 25 ° C to 35 ° C. The water temperature of the cold water C is not particularly limited as long as it is lower than that of the room temperature water G, but is 0 ° to 10 ° C. in the present embodiment. In addition, the temperature of the normal temperature water G (ground water) is influenced by geology and geography. For example, when the latitude is high, the temperature is low, and when the latitude is low, the temperature is high. Moreover, it becomes low temperature near the foot of the mountain, and high temperature near the coastal plain.

  As shown in FIG. 1 and FIGS. 6 (A) to 6 (E), groundwater (room temperature water G (12 ° C. to 20 ° C.) containing pollutants pumped from the well 120 in the summer is heated by the heat exchanger 70. Heat is exchanged with the medium to obtain warm water, which is purified by the purification device 112 and injected from the well 122 to the aquifer 12 (warm water injection step).

  As described above, since the purification device 112 purifies with the hot water H, when air is sent to improve the water quality by volatilizing the volatile contaminants, the higher temperature tends to volatilize, so the purification efficiency is improved. Alternatively, also when a purification agent is added and reacted to improve water quality, the higher the temperature, the higher the reaction rate, so that the purification efficiency is improved. That is, purification with hot water H improves purification efficiency and promotes purification.

  The temperature of the heat medium exchanged with the ground water (normal temperature water G) in the heat exchanger 70 is lowered, and the heat medium having the lowered temperature is used for cooling by the air conditioner 60 and is also used for cooling. The heat medium is sent to the heat exchanger 70. Then, the heat medium whose temperature has risen is exchanged with the ground water as described above, so that the ground water becomes warm water and is poured into the aquifer 12. Since the normal temperature water G is cooler than the outdoor air in summer, the temperature of the heat medium decreases by exchanging heat with the normal temperature water G and can be used for cooling in the air conditioner 60.

  By pumping the normal temperature water G from the well 120 and pouring the hot water H from the well 122 in this way, as shown in FIGS. The water G is replaced with warm water H. Then, as shown in FIG. 6 (E), when the summer season ends, the groundwater in the aquifer 12 is replaced with the hot water H from the normal temperature water G.

  During the autumn season, the purification of the contaminated soil 20 (see FIG. 1) is suspended (left in the state of FIG. 6E). However, the underground is not easily affected by the temperature change of the atmosphere due to the heat insulating function of the soil, and is excellent in heat retention, and the temperature of the warm water H stored in the aquifer 12 during the autumn season hardly decreases. That is, the exhaust heat (warm heat) of the air conditioner 60 is stored in the aquifer 12 as warm water H.

  Here, when the groundwater of the aquifer 12 becomes the warm water H, when the cleaning agent is added and the pollutant is eluted in the groundwater, the warm water H having a higher temperature is more effectively eluted and purified. Facilitate. In addition, when biological purification is performed, the microorganisms that perform purification become active and the growth rate of the microorganisms increases, which makes it easier for the microorganisms to produce enzymes that break down the pollutants. As a result, the pollutants are effectively purified. Purification is promoted. By becoming warm water H in this way, the purification efficiency of pollutants is improved and purification is promoted as compared with the case of room temperature water G.

  In the winter season, as shown in FIG. 2 and FIGS. 7A to 7E, the ground water (warm water H) containing the pollutant pumped from the well 122 is purified by the purifier 112 and the heat exchanger 70. Then, heat is exchanged with the heat medium to make cold water C, and water is poured from the well 120 to the aquifer 12 (cold water injection step).

  As in the summer, the purification device 112 purifies with the hot water H, so that the purification efficiency is improved and the purification is promoted.

  The heat medium heat-exchanged with the ground water (warm water H) in the heat exchanger 70 has a raised temperature, and the heat medium whose temperature has been raised is used for heating by the air conditioner 60 and is also used for heating and the temperature is lowered. The medium is sent to the heat exchanger 70. Then, as described above, the heat medium whose temperature has been lowered is heat-exchanged with the groundwater (hot water H), so that the groundwater becomes cold water C and is poured into the aquifer 12.

  In addition, since heat is exchanged with the groundwater of the hot water H at this time, the temperature of the heat medium is more effectively raised than when the heat is exchanged with the groundwater of the normal temperature water G, and the heating efficiency in the air conditioner 60 is improved.

  In this way, the warm water H is pumped from the well 122 and the cold water C is poured from the well 120, so that the groundwater of the aquifer 12 is gradually warmed as shown in FIGS. 7 (A) to 7 (E). Replace H with cold water C. Then, as shown in FIG. 7E, when the winter season ends, the groundwater in the aquifer 12 is replaced with hot water H by cold water C.

  During the spring season, the purification of the contaminated soil 20 (see FIG. 2) is suspended (left in the state of FIG. 7E). However, the underground is excellent in heat retention, and the temperature of the cold water C stored in the aquifer 12 during spring is hardly decreased. That is, the exhaust heat (cold heat) of the air conditioner 60 is stored in the aquifer 12 as cold water C.

  In the summer of the following year, as shown in FIG. 1 and FIGS. 6 (A) to 6 (E), cold water C containing pollutants pumped from the well 120 is heat-exchanged with the heat medium by the heat exchanger 70. The hot water H is then purified by the purification device 112 and injected into the aquifer 12 from the well 122 (warm water injection process). In the first year, normal temperature water G is pumped up, but cold water C stored in the aquifer 12 is pumped up from the next year.

  The temperature of the heat medium exchanged with the chilled water C by the heat exchanger 70 decreases, and the heat medium having the decreased temperature is used for cooling by the air conditioner 60, and the heat medium having the increased temperature used for cooling is heated. It is sent to the exchanger 70. Then, the heat medium whose temperature has risen is heat-exchanged with the ground water as described above, so that the ground water becomes warm water H and is poured into the aquifer 12.

  In addition, since the heat exchange with the ground water of the cold water C is performed after the summer of the following year, the temperature of the heat medium is effectively reduced and the cooling efficiency in the air conditioner 60 is improved as compared with the heat exchange with the ground water of the normal temperature water G. To do.

  Thus, the cold water C is pumped from the well 120 and the hot water H is injected from the well 122, so that the groundwater of the aquifer 12 gradually becomes cold water C as shown in FIGS. 6 (A) to 6 (E). Will be replaced by hot water H. And as shown in FIG.6 (E), when the summer season is complete | finished, the groundwater of the aquifer 12 will replace the cold water C with the hot water H. FIG.

  As described above, the contaminated soil 20 is purified by intermittently repeating the hot water injection process and the cold water injection process at intervals, so that the pollutant finally becomes a specified value or less. It should be noted that it takes several to tens of years for the pollutant to fall below the specified position, but purification is promoted by applying the present invention, and in a shorter time than when the present invention is not applied. And below the specified value.

  Here, the control device 80 compares the measurement result (progress of the removal of the pollutant) and the pollutant removal plan with the measuring device 82 that measures the state of the groundwater containing the pollutant in the contaminated soil 20, and the groundwater line. The operation of pumps and valves (not shown) 124 is controlled to control the amount of water injected and the amount of pumped water in the well 120 and the well 122. For example, when the concentration of pollutants is higher than planned (when the progress of purification is slower than planned), the amount of water injection or pumping is increased to increase the movement speed of groundwater (FIGS. 6 (A) to 6 (E) and 7A to 7E) are raised. It also increases the amount of cleaning agents, nutrients, oxygen and microorganisms. Moreover, for example, according to the temperature of the aquifer 12 (the replacement situation of the hot water H and the cold water C), the amount of injected water or the amount of pumped water is increased to increase the groundwater movement speed (FIGS. 6A to 6E and FIG. 7 (A) to 7 (E)) are controlled.

  Further, the control device 80 controls the flow rate of the heat medium exchanged by the heat exchanger 70 according to the flow rate of the pumped ground water (normal temperature water G, cold water C, hot water H), that is, the ground water line 124, that is, the heat medium line. The flow rate through 72 is controlled. That is, when the flow rate of the groundwater line 124 is large, the flow velocity flowing through the heat medium line 72 is increased, and when the flow rate of the groundwater line 124 is small, the flow velocity flowing through the heat medium line 72 is decreased. Thereby, the air conditioning efficiency in the air conditioner 60 is improved.

  In this way, when the exhaust heat (hot heat) generated from the air conditioner 60 in the summer is purified by the normal temperature water G by pouring the ground water into the aquifer 12 through the heat medium and the heat exchanger 70 as the hot water H. As compared with the above, the purification efficiency of the contaminated soil 20 is improved.

  In addition, the waste heat (heat / cold heat) from the air conditioner 60 is stored in the aquifer 12 as hot water H and cold water C and stored in the aquifer 12 in summer and winter, thereby purifying the contaminated soil 20 and the air conditioner 60. Overall energy efficiency combined with air conditioning is improved.

  In addition, as mentioned above, although the purification | cleaning of soil contamination is started from the summer in the above, it is not limited to this. Purification of soil contamination may be started from winter. In this case, normal temperature water G is pumped in the first winter season. However, since the normal temperature water G is hotter than the outside air in winter, the heat medium is heated by the heat exchange with the normal temperature water G and can be used for heating by the air conditioner 60.

<Second embodiment>
The purification equipment of the contaminated soil which concerns on 2nd embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

[soil]
As shown in FIGS. 3 and 4, the aquifer 12 is below the groundwater level S in the ground 11. In the aquifer 12, contaminated soil 20 containing pollutants is present. Below the aquifer 12 is a hardly permeable layer 14 that is less permeable than the aquifer 12.

  In the present embodiment, the aquifer 16 is also provided on the lower side of the poorly permeable layer 14. And also in this aquifer 16, the contaminated soil 22 in which a pollutant exists exists.

  As in the first embodiment, the pollutants contained in the contaminated soils 20 and 22 are organic compounds typified by trichlorethylene and benzene, metal compounds such as hexavalent chromium and arsenic, inorganic compounds such as cyan, gasoline and light oil. These are representative mineral oils. Further, as in the first embodiment, structures such as office buildings and commercial facilities (not shown) are built on the ground 11.

[Purification equipment]
The purification equipment 200 includes a water shielding wall 52, a purification well device 210, a heat exchanger 70, an air conditioner 60, and a control device 80. In addition, since the heat exchanger 70 and the air conditioner 60 are the structures similar to 1st embodiment, description is abbreviate | omitted.

  The impermeable wall 52 is formed so as to surround the contaminated soil 20 and the contaminated soil 22. Further, the lower end portion 52 </ b> A reaches the lower aquifer 16 and is formed to be positioned below the contaminated soil 22. Therefore, the contaminated soil 20 and the contaminated soil 22 are surrounded by the water-impervious wall 52 and closed.

  The purification well device 210 includes a purification device 112 and two wells 220 and 222. The two wells 220 and 222 are arranged at an interval so that the contaminated soils 20 and 22 are sandwiched between the inner sides surrounded by the water shielding wall 52. Further, the two wells 220 and 222 penetrate the poorly permeable layer 14 and reach the lower aquifer 16. The well 220 and the well 222 are connected by a groundwater line 224, and the purification device 112 is installed in the groundwater line 224. In addition, since the purification apparatus 112 is the same structure as 1st embodiment, description is abbreviate | omitted.

  As shown in FIG. 3, the purification well apparatus 210 pumps water from one well 220 by using a pump or a valve (not shown), and purifies the groundwater containing the polluted material with the purification apparatus 112, and then the other well 222. It is configured to be able to pour water from. Further, as shown in FIG. 4, the purification well device 210 may pump water from the other well 222, purify the groundwater containing the pumped contaminants with the purification device 112, and then pour water from the other well 220. It is configured as possible.

  As described above, the two wells 220 and 222 are configured to perform pumping and water injection, respectively. Further, the two wells 220 and 222 can individually pump water and pour water into the upper aquifer 12 and the lower aquifer 16, respectively. The flow rate can be controlled. An example of a specific configuration of the two wells 220 and 222 will be described later.

  Here, arrows in FIGS. 3 and 4 indicate the flow of groundwater in the aquifer 12 and the aquifer 16, the flow of groundwater in the groundwater line 224, the flow of heat medium in the heat medium line 72, and the air conditioner. The air flow at 60 is shown respectively. As will be described later, the directions of these arrows are reversed in FIGS. 3 and 4.

  The control device 280 controls the operation of pumps and valves (not shown) of the groundwater line 224 to switch between water injection and pumping in the well 220 and the well 222 (switching the direction of flowing through the groundwater line 124), and water injection The amount of water to be injected and the amount of water to be pumped are individually controlled by the upper aquifer 12 and the lower aquifer 16. Further, the control device 280 controls a pump or the like (not shown) of the heat medium line 72 to control the direction in which the heat medium circulates through the heat medium line 72 and the flow rate (flow rate per unit time). .

  In the contaminated soils 20 and 22, measuring devices 82 for measuring the state of groundwater containing the pollutants are embedded. Each measuring device 82 measures the water pressure of the groundwater flowing through the upper aquifer 12 and the lower aquifer 16, the concentration of contaminants and purifiers in the groundwater, the water quality such as dissolved oxygen, the temperature of the groundwater, etc. It comes to measure. The measurement result is sent to the control device 280. 3 and 4, the measuring device 82 is provided at only one location (although illustrated), it may be provided at a plurality of locations.

(Configuration example of well 220 and well 222)
As described above, the wells 220 and 222 are configured such that the flow rate of water injection and pumping can be individually controlled for the upper aquifer 12 and the lower aquifer 16. . Therefore, a configuration example of the wells 220 and 222 will be described here. Although the well 222 is described below, the well 220 has the same configuration.

  As shown in FIG. 5, a first well steel pipe 230 and a second well steel pipe 232 capable of performing water injection and pumping are inserted into one well 222. Further, a water blocking material layer 240 is provided at a depth of the poorly permeable layer 14 in the well 222.

  The first well steel pipe 230 is disposed so that the tip end portion 230 </ b> A is located above the water blocking material layer 240. The tip 230A of the first well steel pipe 230 is a perforated pipe so that groundwater can be poured and pumped.

  The second well steel pipe 232 is disposed so as to penetrate the water-stopping material layer 240 and the tip 232 </ b> A is positioned below the water-stopping material layer 240. The tip 232A of the second well steel pipe 232 is a perforated pipe so that groundwater can be poured and pumped.

  Then, the first well steel pipe 230 and the second well steel pipe 232 join in the groundwater line 224 (see FIGS. 3 and 4) and are purified by the purification device 112 (see FIGS. 3 and 4), and heat exchange is performed. The apparatus 70 is configured to exchange heat with the heat medium.

  In the wells 220 and 222, the configuration in which the upper aquifer 12 and the lower aquifer 16 can individually inject and pump water and control the flow rate is not limited to the above configuration. Any configuration may be used. Furthermore, the structure which has two wells, the well of the upper aquifer 12 and the well of the lower aquifer 16, may be sufficient.

<Action and effect>
Next, the effects of the present embodiment will be described while explaining a method for purifying contaminated soil. Since the basic purification method is the same as that of the first embodiment, the same parts as those of the first embodiment will be omitted or simplified as appropriate.

  As shown in FIG. 3, the groundwater containing the pollutant pumped from the well 220 in the summer (room temperature water (about 18 ° C.)) is heat-exchanged with the heat medium by the heat exchanger 70 to be warm water and purified by the purification device 112. Then, water is poured from the well 222 to the aquifer 12 and the aquifer 16 (warm water injection process).

  The temperature of the heat medium exchanged with the ground water (normal temperature water G) in the heat exchanger 70 is lowered, and the heat medium having the lowered temperature is used for cooling by the air conditioner 60 and is also used for cooling. The heat medium is sent to the heat exchanger 70. Then, as described above, the heat medium whose temperature has been raised is heat-exchanged with the groundwater, so that the groundwater becomes warm water and is poured into the aquifer 12 and the aquifer 16.

  As described above, the normal temperature water G is pumped from the well 220 and the hot water is poured from the well 222, whereby the groundwater in the aquifer 12 and the aquifer 16 is gradually replaced with the hot water H from the normal temperature water G. Then, when the summer season ends, the groundwater in the aquifer 12 and aquifer 16 is replaced by cold water C (or room temperature water G) to warm water H (see FIGS. 6A to 6E).

  During the autumn season, purification of the contaminated soils 20 and 22 is suspended. However, the underground has excellent heat retention, and the temperature of the warm water H stored in the aquifers 12 and 16 hardly decreases during the autumn season. That is, the exhaust heat (warm heat) of the air conditioner 60 is stored in the aquifer 12 and the aquifer 16 as warm water H.

  Here, since the groundwater of the aquifer 12 and the aquifer 16 becomes the warm water H, the purification efficiency of pollutants is improved and the purification is promoted as compared with the case of the normal temperature water G as in the first embodiment. To do. The upper aquifer 12 and the lower aquifer 16 may be purified by different purification methods.

  Further, the purification device 112 purifies with the hot water H, so that the purification efficiency is improved and the purification is promoted as in the first embodiment.

  In the winter season, as shown in FIG. 4, ground water (warm water H) containing pollutants pumped from the well 222 is purified by the purifier 112 and heat exchanged with the heat medium by the heat exchanger 70 to form cold water C. To the aquifer 12 and aquifer 16 (cold water injection step).

  The heat medium heat-exchanged with the ground water (warm water H) in the heat exchanger 70 has a raised temperature, and the heat medium whose temperature has been raised is used for heating by the air conditioner 60 and is also used for heating and the temperature is lowered. The medium is sent to the heat exchanger 70. Then, as described above, the heat medium having the lowered temperature is heat-exchanged with the groundwater (warm water H), so that the groundwater becomes cold water C and is poured into the aquifer 12 and the aquifer 16.

  Further, since the purification device 112 purifies with the hot water H even in winter, the purification efficiency is improved and the purification is promoted as described above.

  As described above, the hot water H is pumped from the well 122 and the cold water C is poured from the well 120, whereby the groundwater in the aquifer 12 and the aquifer 16 is gradually replaced from the hot water H to the cold water C. When the winter season ends, the groundwater in the aquifer 12 and aquifer 16 is replaced by hot water H at temperature to cold water C (see FIGS. 7A to 7E).

  During the spring season, purification of the contaminated soil 20 (see FIG. 2) is suspended. However, the underground has excellent heat retention, and the temperature of the cold water C stored in the aquifers 12 and 16 hardly decreases during the spring season. That is, the exhaust heat (cold heat) of the air conditioner 60 is stored in the aquifer 12 and the aquifer 16 as cold water C.

  In the summer of the following year, the cold water C containing the pollutant pumped from the well 220 again is heat-exchanged with the heat medium by the heat exchanger 70 to be converted into hot water H and purified by the purification device 112, and from the well 222 to the aquifer 12 and Water is poured into the aquifer 16. In the first year, the normal temperature water G is pumped, but from the next year, the cold water C stored in the aquifer 12 and the aquifer 16 is pumped.

  The temperature of the heat medium exchanged with the chilled water C by the heat exchanger 70 decreases, and the heat medium having the decreased temperature is used for cooling by the air conditioner 60, and the heat medium having the increased temperature used for cooling is heated. It is sent to the exchanger 70. Then, the heat medium whose temperature has been raised is heat-exchanged with the ground water as described above, so that the ground water becomes the warm water H and is poured into the aquifer 12 and the aquifer 16.

  Since the heat exchange with the ground water of the cold water C is performed, the temperature of the heat medium is more effectively lowered than the heat exchange with the ground water of the normal temperature water G, and the cooling efficiency in the air conditioner 60 is improved.

  Thus, the cold water C is pumped from the well 220 and the hot water H is poured from the well 222, whereby the groundwater in the aquifer 12 and the aquifer 16 is gradually replaced with the hot water H from the cold water C. And the groundwater of the aquifer 12 and the aquifer 16 is replaced by the cold water C to the hot water H (see FIGS. 6A to 6E).

  As described above, the contaminated soil 20 and the contaminated soil 22 are purified by intermittently repeating the hot water injection process and the cold water injection process at intervals, and finally the pollutants become below the specified value. . It should be noted that it takes several to tens of years for the pollutant to fall below the specified position, but purification is promoted by applying the present invention, and in a shorter time than when the present invention is not applied. And below the specified value.

  Here, the control device 280 sends a measurement result (progress of removal of the pollutant) to the measuring device 82 that measures the state of the groundwater containing the pollutant in the contaminated soil 20 of the upper aquifer 12 and the lower band. The measurement result (progress of removal of pollutants) is compared with the pollutant removal plan in a measuring device 82 that measures the state of groundwater containing pollutants in the contaminated soil 22 of the water layer 16, and the groundwater line 224 The operation of pumps and valves (not shown) is controlled to control the amount of water injected and pumped into the upper aquifer 12 and the amount of water injected and pumped into the lower aquifer 16. .

  Furthermore, the control device 280 has a temperature difference between the groundwater pumped from the upper aquifer 12 (cold water C or hot water H) and the groundwater pumped from the lower aquifer 16 (cold water C or hot water H). The amount of pumping and water injection of the upper aquifer 12 and the amount of water pumping and water injection of the lower aquifer 16 are individually controlled so as to decrease. Therefore, the heat loss by the temperature difference of the pumped-up ground water (cold water C or warm water H) is suppressed, and the conversion efficiency of the heat exchange by the heat exchanger 70 improves.

  Furthermore, as in the first embodiment, the control device 280 performs heat exchange in the heat exchanger 70 according to the pumped ground water (normal temperature water G, cold water C, hot water H), that is, the flow rate of the ground water line 124. The flow rate of the medium, that is, the flow velocity flowing through the heat medium line 72 is controlled. Thereby, the air conditioning efficiency in the air conditioner 60 is improved.

<Others>
The present invention is not limited to the above embodiment.

  For example, in the said embodiment, although the impermeable walls 50 and 52 are formed so that the circumference | surroundings of the contaminated soil 20 and 22 may be enclosed, it is not limited to this. A structure in which a part of the impermeable wall is opened may be used. Furthermore, the structure of the purification equipment which does not have a water-impervious wall may be sufficient.

  For example, in the said embodiment, although the heat medium heat-exchanged with groundwater was utilized with the air conditioner 60 provided in the structure which is not shown in figure, it is not limited to this. You may utilize for apparatuses and facilities other than an air conditioner. For example, it may be used for cooling machines and devices in summer, and may be used for heating machinery and devices in winter. Alternatively, it may be used for a heated pool. Further, for example, the pumped-up groundwater may be purified with a purification device before heat exchange with the heat exchanger.

  Further, for example, in the above embodiment, the water is pumped from the wells 122 and 222 in the summer and poured from the wells 120 and 220, and the water is pumped from the wells 120 and 220 and poured from the wells 122 and 222 in the winter. . In both summer and winter, water may be pumped from the wells 122 and 222 (or the wells 120 and 220) and injected from the wells 120 and 220 (or the wells 122 and 222). In this case, the flow of the groundwater line may be switched by a valve or the like so that the hot water flows to the purification device 112.

  Moreover, for example, in the second embodiment, although the purification facility purifies the contaminated soil of the two aquifers of the upper aquifer 12 and the lower aquifer 16, the present invention is not limited to this. The present invention can also be applied to three or more aquifers.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

12 Aquifer 14 Difficult-permeable layer 16 Aquifer 70 Heat exchanger 60 Air conditioner (an example of utilization means)
80 control device (example of first control means, example of second control means)
DESCRIPTION OF SYMBOLS 100 Purification equipment 110 Purification well apparatus 112 Purification apparatus 200 Purification equipment 210 Purification well apparatus 280 Control apparatus (an example of a 1st control means, an example of a 2nd control means)

Claims (6)

A purification well device that pumps groundwater containing contaminants from an aquifer, purifies the pumped groundwater with a purification device, and injects the water into the aquifer,
A heat exchanger that exchanges heat between the pumped groundwater and the heat medium;
Utilization means for using the heat energy of the heat medium exchanged by the heat exchanger and sending the heat medium to the heat exchanger after use;
Contaminated soil purification equipment comprising. The utilization means is an air conditioner,
The purification well device is configured to inject hot water into the aquifer in summer to store heat, and to inject cold water into the aquifer in winter to store heat.
The purification equipment of the contaminated soil of Claim 1. The aquifer containing pollutants has a plurality of layers partitioned by a poorly permeable layer in the ground,
The purification well device is capable of controlling the flow rate of water injection and pumping for each aquifer,
The heat exchanger is configured to exchange heat with the groundwater pumped from a plurality of the aquifers,
Comprising first control means for controlling the flow rate for each aquifer so that the difference in temperature of the groundwater pumped from each aquifer decreases.
The purification equipment of the contaminated soil of Claim 1 or Claim 2. In accordance with the flow rate of the pumped groundwater, second control means for controlling the flow rate of the heat medium that exchanges heat with the heat exchanger is provided.
The purification equipment for contaminated soil according to any one of claims 1 to 3. A purification well device that pumps groundwater containing contaminants from an aquifer, purifies the pumped groundwater with a purification device, and injects the water into the aquifer,
A heat exchanger that exchanges heat between the pumped groundwater and the heat medium;
A utilization means for utilizing the heat energy of the heat medium subjected to heat exchange;
With
A hot water injection step of pumping the ground water stored in the aquifer and heat-exchanging the heat medium with the heat exchanger to form hot water and injecting the water into the aquifer;
A cold water injection step of pumping the groundwater stored in the aquifer and heat-exchanging the heat medium with the heat exchanger to form cold water and injecting into the aquifer;
A method for remediation of contaminated soil, which is performed intermittently at intervals. In the warm water injection step, the ground water that has been heated by exchanging heat in the heat exchanger is purified by the purification device,
In the cold water injection process, the purification device purifies the groundwater pumped up hot water stored in the aquifer,
The method for purifying contaminated soil according to claim 5.

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