JP2017136544A - Soil pollutant recovering structure, and soil pollutant recovering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil pollutant recovering structure that efficiently recovers VOC vaporized from soil by heating.SOLUTION: A soil pollutant recovering structure of the embodiment has: a first cylindrical body equipped with a first end part which can be embedded into soil and a second end part which can be protruded into atmospheric air; a second cylindrical body which is provided in an inside of the first cylindrical body in parallel with a long axis of the first cylindrical body, and is equipped with a third end part provided closer to the first end part and a fourth end part provided closer to the second end part; a first opening provided in a portion of the first cylindrical body which can be embedded into soil; a second opening provided in a portion of the first cylindrical body which can be protruded into atmospheric air, and to which a heating medium generator generating heated gas can be connected; and a fourth opening provided in the fourth end part. The third end part is provided in the same position as the first end part or a position protruded from the first end part in a long axis direction of the first cylindrical body, and a third opening is provided in the third end part.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a soil contaminant collection structure and a soil contaminant collection apparatus.

  Land used as factory land for many years may contain more volatile organic compounds (hereinafter referred to as VOC) than the standard value. VOC is designated as a Class 1 Specified Hazardous Substance stipulated in the Soil Contamination Countermeasures Law, and is a harmful substance that may cause damage to human health due to its inclusion in the soil.

  In general, VOC has a property of penetrating deeply into the ground because it is difficult to dissolve in water, has low viscosity, and has a specific gravity heavier than water. And since VOC is a harmful substance as mentioned above, VOC which permeated the soil contaminates the soil. In recent years, the factory site has been redeveloped with the factory relocation, and techniques for purifying soil contaminated with VOC in the factory site have been extensively studied.

  For example, there is a heat treatment capable of evaporating and removing VOC contained in soil. In this heat treatment, VOC evaporated from the heated soil can be adsorbed or thermally decomposed by a predetermined device.

Japanese Patent No. 3658936

  In the above-described conventional heat treatment, for example, there is a method described in Patent Document 1. In Patent Document 1, at least two cylinders are separated from each other and inserted into soil, a heating medium is introduced into one cylinder to heat the contaminated soil, and the VOC heated and evaporated in the other is transferred to the other cylinder. Collect from the soil by the cylinder. In this method, it is necessary to insert at least two cylinders into the soil. And the operation | work for inserting a cylinder into soil, such as excavation of soil, is required as many as the number of the cylinders inserted in soil. Therefore, as the number of cylinders increases, the soil purification performance increases, while the working time and cost for inserting the cylinders into the soil increase according to the number of cylinders.

  The problem to be solved by the present invention is to provide a soil pollutant recovery structure and a soil pollutant recovery device that can efficiently recover VOC evaporated by heating from soil contaminated with VOC. .

  A soil pollutant recovery structure according to an embodiment includes a first cylinder including a first end that can be embedded in soil, and a second end that can protrude into the atmosphere, and an inner side of the first cylinder. A third end provided on the first end side and a fourth end provided on the second end side. 2 cylinders. Furthermore, the soil pollutant collection structure according to the embodiment includes a first opening provided in a portion of the first cylinder that can be embedded in the soil, and a portion that can protrude into the atmosphere of the first cylinder. A second opening to which a heating medium generator for generating heated gas can be connected, and a fourth opening provided at the fourth end, and the third opening The end is provided at the same position as the first end in the major axis direction of the first cylindrical body or at a position protruding from the first end, and a third opening is formed at the third end. Parts are provided.

  It is possible to provide a soil pollutant recovery structure and a soil pollutant recovery apparatus that can efficiently recover VOC evaporated by heating from soil contaminated with VOC.

It is a conceptual diagram which shows typically the soil pollutant collection | recovery apparatus of 1st Embodiment. It is a top perspective view showing typically the soil pollutant collection structure of a 1st embodiment. It is a downward perspective view showing typically the soil pollutant collection structure of a 1st embodiment. It is a bottom view showing typically the soil pollutant collection structure of a 1st embodiment. It is the graph which showed the temperature dependence of the vapor pressure of trichlorethylene. It is an upper perspective view which shows typically the soil pollutant collection structure which comprises a foreign material removal part. It is an upper perspective view which shows typically the soil pollutant collection structure which comprises a gas-liquid separation part. It is a downward perspective view showing typically the modification of the soil pollutant collection structure of a 1st embodiment. It is an upper perspective view which shows typically the soil pollutant collection structure of 2nd Embodiment. It is a bottom view showing typically the soil pollutant collection structure of a 2nd embodiment. It is an upper perspective view which shows typically the soil pollutant collection structure which comprises a foreign material removal part. It is an upper perspective view which shows typically the soil pollutant collection structure which comprises a gas-liquid separation part. It is an upper perspective view which shows typically the soil pollutant collection structure of 3rd Embodiment. It is an upper perspective view which shows typically the soil pollutant collection structure of 4th Embodiment. It is a conceptual diagram which shows typically the soil pollutant collection | recovery apparatus of 5th Embodiment. It is the schematic which shows a thermal decomposition device typically. It is a conceptual diagram which shows typically the soil pollutant collection | recovery apparatus of 6th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a conceptual diagram schematically showing a soil pollutant recovery apparatus 500 according to the first embodiment.

  The soil pollutant recovery apparatus 500 recovers VOCs present in the soil 520 contaminated with VOCs and purifies the soil 520. As shown in FIG. 1, the soil pollutant recovery apparatus 500 includes a soil pollutant recovery structure 1 inserted into the soil and a heat medium for evaporating VOC in the soil 520 via the soil pollutant recovery structure 1. A heat medium generator 550 that supplies the soil 520 is provided.

  First, the soil contaminant collection structure 1 will be described. FIG. 2 is an upper perspective view schematically showing the soil pollutant recovery structure 1 of the first embodiment, and FIG. 3 is a lower perspective view schematically showing the soil pollutant recovery structure 1. FIG. 4 is a bottom view schematically showing the soil contaminant collection structure 1. The soil pollutant recovery structure 1 recovers VOCs present in soil contaminated with VOCs. This soil pollutant collection structure 1 has a so-called double cylinder structure including a cylindrical first cylinder 2 and a second cylinder 3. The second cylinder 3 is provided along the major axis (hereinafter, also referred to as an axis) direction of the first cylinder 2 and is provided inside the first cylinder 2. For example, the axial direction of the first cylinder 2 and the axial direction of the second cylinder 3 are the same.

  Here, the space between the inner wall of the first cylinder 2 and the outer wall of the second cylinder 3 is referred to as a first flow path 6, and the space inside the second cylinder 3 is referred to as a second flow path 9. To do. The cross section perpendicular to the axial direction of the first cylinder 2 of the first flow path 6 is annular.

  The soil contaminant collection structure 1 is inserted into the soil and installed in the vertical direction. At this time, one end of the soil contaminant collection structure 1 is buried in the soil, and the other end of the soil contaminant collection structure 1 is exposed to the ground. One end portion buried in the soil is referred to as a lower end portion of the soil contaminant collection structure 1, and the other end portion exposed to the ground is referred to as an upper end portion of the soil contaminant collection structure 1.

  The 1st cylinder 2 is provided with the 1st end part which can be embed | buried in soil, and the 2nd end part which can protrude in air | atmosphere. The first end is an end on the lower end side of the first cylinder 2. The second end portion is an end portion on the upper end side of the first cylindrical body 2. The second cylinder 3 is provided inside the first cylinder 2. The axial direction of the first cylinder 2 and the axial direction of the second cylinder 3 are parallel. The second cylinder 3 includes a third end provided on the first end side of the first cylinder 2 and a fourth end provided on the second end side of the first cylinder 2. Prepare. The third end is the end on the lower end side of the second cylinder 3. The fourth end is the end on the upper end side of the second cylinder 3. The cross-sectional area of the space in the first cylinder 2 perpendicular to the axial direction of the first cylinder 2 is larger than the cross-sectional area of the space in the second cylinder 3 perpendicular to the axial direction of the second cylinder 3. large.

  As shown in FIG. 2, the opening of the first flow path 6 provided at the second end is referred to as an inlet 4. The introduction port 4 is provided in a portion of the first cylinder 2 that can protrude into the atmosphere so as to be connectable to a heat medium generator 550 that generates heated gas, and penetrates from the inside of the first cylinder 2 to the outside. doing. A heat medium generator 550 is connected to the introduction port 4, and a heat medium that evaporates VOC present in the contaminated soil in the soil is introduced into the first flow path 6 from the introduction port 4.

  In addition, as shown in FIG. 2, a discharge port 5 that is an opening of the first flow path 6 is provided on a side surface of a portion of the first cylinder 2 that is buried in the soil 520. The discharge port 5 penetrates from the inside of the first cylinder 2 to the outside. The discharge port 5 is provided in a portion of the first cylinder 2 that can be embedded in the soil, and communicates from the inside of the first cylinder 2 to the outside. The heat medium introduced from the inlet 4 and flowing through the first flow path 6 is released from the outlet 5 to the soil 520.

  As described above, the introduction port 4 is the open end on the upper end side of the first cylinder 2, and the inner peripheral surface on the upper end side of the first cylinder 2 and the outer peripheral surface on the upper end side of the second cylinder 3. Formed between. The inlet 4 seen from above the upper end of the first cylinder 2 is annular. Here, an example in which the upper end of the first cylinder 2 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the first cylinder 2. . In this case, the introduction port 4 is at least one opening formed in a lid (not shown).

  As shown in FIGS. 2 and 3, the discharge port 5 is formed on the side surface on the lower end side of the first cylinder 2. Here, an example is shown in which the discharge ports 5 are provided in a plurality of stages over the entire circumference of the side surface on the lower end side of the first cylindrical body 2, but the discharge ports 5 may be provided in a single stage and are provided in a part of the side surface. Also good.

  Moreover, although an example in which the lower end of the first cylinder 2 is a closed end is shown, at least one opening (not shown) may be provided on the bottom surface of the first cylinder 2, and the lower end of the first cylinder 2 is It may be an open end (not shown). When at least one opening (not shown) is provided on the bottom surface of the first cylinder 2, the opening (not shown) also forms the discharge port 5. When the lower end of the first cylinder 2 is an open end (not shown), the open end (not shown) also constitutes the discharge port 5, and the inner peripheral surface of the first cylinder 2 and the outer peripheral surface of the second cylinder 3. Formed between. The section of the open end (not shown) viewed from below from the lower end of the first cylinder 2 is annular.

  As shown in FIG. 2, the first flow path 6 is provided along the axial direction of the first cylinder 2. The cross section of the first flow path 6 perpendicular to the axial direction of the first cylindrical body 2 is annular. The 1st flow path 6 distribute | circulates the heat medium introduce | transduced from the exterior of the soil pollutant collection structure 1 through the inlet 4 to the lower end side of the 1st cylinder 2 like arrow A1. And the heat medium which distribute | circulated the inside of the 1st flow path 6 to the lower end side of the 1st cylinder 2 is discharge | released outside the soil pollutant collection structure 1 through the discharge port 5. FIG.

  A recovery port 7, which is an opening of the second flow path 9, is provided at a position below the discharge port 5 that is the third end of the second cylinder 3. The collection port 7 penetrates from the inside of the second cylinder 3 to the outside. The VOC evaporated in the soil 520 flows into the second flow path 9 from the recovery port 7. For example, as shown in FIGS. 3 and 4, the recovery port 7 is formed on the bottom surface 10 of the second cylinder 3. Here, an example is shown in which the lower end of the second cylinder 3 is a closed end provided with a recovery port 7, but the lower end of the second cylinder 3 is an open end (not shown), and this open end is the recovery port 7. Also good.

  In addition, since the collection port 7 is provided below the discharge port 5, the heat medium discharged from the discharge port 5 is always collected by the collection port 7 after passing through the soil. As shown in FIG. 3, the lowermost end of the second cylindrical body 3 is at the same position as the lowermost end of the first cylindrical body 2 with respect to the axial direction of the first cylindrical body 2. Therefore, the lowermost end of the second cylinder 3 may be provided so as to protrude downward from the lowermost end of the first cylinder 2.

  The opening at the upper end of the second cylinder 3 is referred to as a discharge port 8. The discharge port 8 is provided so as to be connectable to an aspirator 551 that leads from the inside of the second cylinder 3 to the outside and sucks fluid. The VOC flowing into the second flow path 9 from the recovery port 7 is discharged from the discharge port 8 to the ground. As shown in FIG. 2, the discharge port 8 is an open end on the upper end side of the second cylinder 3, in other words, an upper end inner peripheral portion of the second cylinder 3. The discharge port 8 viewed from above from the upper end of the second cylinder 3 is circular. Here, an example in which the upper end of the second cylinder 3 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the second cylinder 3. . In this case, the discharge port 8 is at least one opening formed in a lid (not shown).

  As shown in FIG. 2, the second flow path 9 is provided along the axial direction of the second cylinder 3. The cross section of the second flow path 9 perpendicular to the axial direction of the second cylinder 3 is circular. The second flow path 9 circulates the VOC recovered from the outside of the soil pollutant recovery structure 1 through the recovery port 7 to the upper end side of the second cylinder 3 as indicated by an arrow A2. The VOC flowing through the second flow path 9 to the upper end side of the second cylinder 3 is discharged to the outside of the soil contaminant collection structure 1 through the discharge port 8.

  In addition, the material which comprises the 1st cylinder 2 and the 2nd cylinder 3 is not specifically limited, The material which does not deteriorate with water vapor | steam or VOC is used.

  Next, the heat medium generator 550 will be described. The heat medium generator 550 generates a heat medium for evaporating VOC in the soil 520, and generates heated gas. The heat medium is not particularly limited as long as it can evaporate VOC in the soil 520, and is assumed to be heated air or water vapor, for example. As shown in FIGS. 1 and 2, the heat medium generated by the heat medium generator 550 is introduced into the first flow path 6 from the inlet 4 of the soil pollutant recovery structure 1. The heat medium introduced into the first flow path 6 circulates toward the lower end side of the first cylinder 2 as indicated by an arrow A1. The heat medium that has reached the lower end of the first cylinder 2 is discharged from the discharge port 5 to the outside of the soil contaminant collection structure 1.

  The heat medium released to the soil 520 from the inside of the soil contaminant collection structure 1 is a temperature at which VOC contained in the soil 520 can be evaporated. Then, the heat medium released from the lower end side of the soil contaminant collection structure 1 as indicated by an arrow A503 evaporates VOC existing in the soil 520. Then, the VOC in the soil 520 evaporated by the heat medium is recovered from the recovery port 7 of the soil pollutant recovery structure 1 as indicated by an arrow A504.

  Next, VOC recovered from soil will be described. The VOC recovered from the soil by the soil pollutant recovery structure 1 is a general volatile organic compound such as trichlorethylene or tetrachloroethylene. VOCs are generally easily evaporated at room temperature, and the amount of evaporation further increases by heating. FIG. 5 is a graph showing the temperature dependence of the vapor pressure of trichlorethylene. For example, the vapor pressure of trichlorethylene at an underground temperature of about 15 ° C. is lower than 1 atmosphere. It can be seen that when trichlorethylene is heated to about 90 ° C., the vapor pressure of trichlorethylene becomes higher than 1 atm, so that the amount of evaporation of trichlorethylene increases significantly.

  Examples of the heat medium flowing through the first flow path 6 as indicated by the arrow A1 include heated air and water vapor. Moreover, the temperature of the heat medium discharged | emitted from the discharge port 5 to soil becomes like this. Preferably it is 87 degreeC or more. When the temperature of the heat medium discharged from the discharge port 5 to the soil is 87 ° C. or higher, the temperature of the soil becomes higher than the boiling point of trichlorethylene, so the amount of trichlorethylene evaporated increases and the trichlorethylene recovered in the recovery port 7 The amount of increases. As the temperature of the heating medium rises when discharged from the discharge port 5 to the soil, the area where VOC can be recovered increases. Further, the temperature of the heat medium introduced from the inlet 4 is appropriately adjusted according to the temperature of the heat medium released from the outlet 5.

  The VOC flowing through the second flow path 9 as indicated by an arrow A2 is a liquid, gas, liquid and gas mixed system. Further, the VOC in any one of these states may circulate through the second flow path 9 together with a fluid other than the VOC such as air, water vapor, and water.

  Next, the flow of VOC recovery by the soil contaminant collection structure 1 will be described. As shown in FIG. 2, the heat medium introduced from the inlet 4 of the soil pollutant collection structure 1 circulates in the first flow path 6 toward the lower end side of the first cylinder 2 as indicated by an arrow A1. To do. The heat medium that has reached the lower end of the first cylinder 2 is discharged from the discharge port 5 to the outside of the soil contaminant collection structure 1.

  Since the heat medium released to the outside of the soil pollutant collection structure 1, in other words, the soil has a temperature at which the VOC contained in the soil can be evaporated, the VOC existing in the soil is evaporated. The VOC in the soil evaporated by the heat medium is recovered from the recovery port 7 of the soil pollutant recovery structure 1.

  The VOC recovered in the second flow path 9 from the outside of the soil pollutant recovery structure 1 through the recovery port 7 is moved to the upper end side of the second cylinder 3 in the second flow path 9 as indicated by an arrow A2. It circulates toward. The VOC that has reached the upper end of the second cylinder 3 is discharged from the discharge port 8 to the outside of the soil contaminant collection structure 1. The soil pollutant recovery structure 1 distributes the heat medium introduced from the inlet 4 to the lower end side of the first flow path 6 as indicated by an arrow A1, and separates it from the heat medium flowing through the first flow path 6. The VOC recovered from the recovery port 7 is circulated to the upper end side of the second flow path 9 as indicated by an arrow A2. In this way, the soil contaminant collection structure 1 collects VOC contained in the soil.

  Moreover, the heat medium discharged | emitted from the discharge port 5 also evaporates the water | moisture content in soil. As the amount of heat medium discharged from the discharge port 5 and the discharge time, the amount of evaporation of VOC and water in the soil existing around the soil pollutant collection structure 1 including the discharge port 5 and the recovery port 7 increases. Then, the soil around the soil contaminant collection structure 1 becomes porous. Since the ventilation resistance of the porous soil is reduced, the recovery efficiency of VOC is further increased. Furthermore, since the heat medium having a temperature capable of evaporating VOC can be diffused far away from the soil pollutant collection structure 1 due to a decrease in the soil ventilation resistance, the area where the VOC can be recovered is further expanded.

  Here, a modified example of the soil contaminant collection structure and the soil contaminant collection apparatus of the first embodiment will be described.

  For example, the soil contaminant collection structure 1 may further include a foreign substance removal unit 11 that removes foreign substances from the fluid collected from the collection port 7. Examples of the foreign material include soil, sand, gravel, and stone. FIG. 6 is an upper perspective view schematically showing the soil pollutant recovery structure 1 including the foreign matter removing unit 11. For example, the foreign matter removing unit 11 is a mesh filter provided at the entrance of the recovery port 7 of the soil contaminant collection structure 1. The foreign matter removal unit 11 prevents foreign matter from entering the second flow path 9 from the recovery port 7 and suppresses the foreign matter from entering the second flow path 9.

  The foreign matter removing unit 11 may be composed of a porous body in addition to the mesh filter. The pore diameter of the foreign matter removing unit 11 is appropriately selected according to the type of foreign matter described above. Moreover, the foreign material removal part 11 should just cover at least the whole collection port 7, and as shown in FIG. 6, the structure which covers all the lower ends of the 1st cylinder 2 may be sufficient as it.

  The soil contaminant collection structure 1 may further include a gas-liquid separation unit 12 that separates a gas component and a liquid component such as VOC collected from the collection port 7 and a fluid other than VOC. FIG. 7 is an upper perspective view schematically showing the soil contaminant collection structure 1 including the gas-liquid separator 12. As shown in FIG. 7, the gas-liquid separator 12 is provided in the vicinity of the recovery port 7 of the soil pollutant recovery structure 1. The gas-liquid separator 12 separates the fluid recovered from the recovery port 7 into a liquid component and a gas component, and causes the gas component to flow through the second flow path 9.

  The gas-liquid separation unit 12 includes, for example, a gas-liquid separation film or a gas-liquid separator that is generally used for separating gas and liquid. Moreover, the gas-liquid separation part 12 should just cover at least the whole collection port 7, and as shown in FIG. 7, the structure which covers all the lower ends of the 1st cylinder 2 may be sufficient as it.

  The soil contaminant collection structure 1 may include a gas-liquid separation unit 12 together with the foreign matter removal unit 11. When the soil contaminant collection structure 1 includes the foreign matter removing unit 11 and the gas-liquid separating unit 12, the foreign matter removing unit 11 is provided at the lower end of the second cylinder 3, and the gas / liquid is provided at the lower end of the foreign matter removing unit 11. The separation unit 12 may be provided, the gas-liquid separation unit 12 may be provided at the lower end of the second cylinder 3, and the foreign matter removal unit 11 may be provided at the lower end of the gas-liquid separation unit 12. 11 and the gas-liquid separator 12 may be integrated at the lower end of the second cylinder 3.

  FIG. 8 is a lower perspective view schematically showing a modified example of the soil contaminant collection structure of the first embodiment. As shown in FIG. 8, the soil pollutant recovery structure 1 may be provided such that the lower end of the second cylinder 3 protrudes below the lower end of the first cylinder 2. By projecting the lower end of the second cylinder 3 from the lower end of the first cylinder 2, the distance between the discharge port 5 and the recovery port 7 is increased, and the distance that the heat medium passes through the soil is increased accordingly. VOCs in a wider range of soil can be evaporated.

  In addition, the soil contaminant collection device 500 may further include a suction device 551 that sucks the VOC discharged from the discharge port 8. The suction device 551 sucks the gaseous VOC. The suction device 551 is connected to the discharge port 8.

  As shown in FIG. 1 and FIG. 2, the suction device 551 sucks VOC released from the discharge port 8 to the outside of the soil contaminant collection structure 1. Since the gas in the second flow path 9 is heated by the heat medium, it flows as indicated by the arrow A2 without the suction device 551. However, the presence of the suction device 551 promotes the flow of VOC in the direction of the arrow A2. The And the gas amount which flows in into the 2nd flow path 9 from the collection port 7 increases. Furthermore, since the atmospheric pressure in the soil decreases, the release of the heat medium from the discharge port 5 to the soil and the circulation of the heat medium in the first flow path 6 are also promoted.

  The soil pollutant recovery apparatus 500 may further include an adsorber 552 that adsorbs a gas component of VOC discharged from the discharge port 8 of the soil pollutant recovery structure 1. The adsorber 552 is provided between the soil contaminant collection structure 1 and the aspirator 551, and includes an adsorbent such as activated carbon that selectively adsorbs VOCs. The adsorber 552 selectively adsorbs VOC contained in the fluid discharged from the discharge port 8 and selectively removes VOC from the fluid discharged from the discharge port 8. Further, the adsorption performance of the adsorber 552 is maintained by periodically exchanging the adsorbed substance.

  In addition, the soil pollutant recovery device 500 may include a decomposer (not shown) that decomposes the gaseous component of the VOC discharged from the discharge port 8 of the soil pollutant recovery structure 1 in place of the adsorber 552. Good. A decomposer (not shown) is provided between the soil contaminant collection structure 1 and the suction device 551, and has a configuration for selectively decomposing VOC. This decomposer selectively decomposes VOC contained in the fluid discharged from the discharge port 8 and selectively removes VOC from the fluid discharged from the discharge port 8.

  Hereinafter, effects common to the first embodiment and its modifications will be described. As described above, according to the first embodiment, the soil pollutant collection structure 1 has a so-called double cylinder structure, so that the supply of the heat medium for evaporating the VOC and the recovery of the evaporated VOC are performed. In the soil pollutant recovery structure 1. Therefore, it is not necessary to insert the cylinder for soil heating and the cylinder for VOC recovery into the soil at positions separated from each other. The amount of work and work time when installing the soil pollutant recovery structure 1 and the soil pollutant recovery device are shortened, so that from the installation of the soil pollutant recovery device to the removal of VOC and the recovery of the soil pollutant recovery device There is an effect that work efficiency becomes high.

  Furthermore, according to the first embodiment, the heat medium is circulated to the lower end side in the first flow path 6 and discharged from the discharge port 5, and is separated from the heat medium, and the VOC is recovered from the recovery port 7. Then, it can be circulated to the upper end side in the second flow path 9. Therefore, the soil pollutant recovery structure 1 can simultaneously perform the evaporation and recovery of the VOC, and can reduce the VOC recovery time.

(Second Embodiment)
FIG. 9 is an upper perspective view schematically showing the soil pollutant recovery structure 100 of the second embodiment, and FIG. 10 is a bottom view schematically showing the soil pollutant recovery structure 100. In the following embodiment, the same components as those of the soil pollutant recovery structure 1 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  In the soil pollutant recovery structure 100 of the second embodiment, the configuration of the soil pollutant recovery structure 1 of the first embodiment is different except that the configurations of the first cylinder 102 and the second cylinder 103 are different. And basically the same. Therefore, here, the different configuration will be mainly described.

  The soil pollutant recovery structure 100 of the second embodiment has a so-called double cylinder structure including a first cylinder 102 and a second cylinder 103 which are cylindrical. The first cylinder 102 is provided along the axial direction of the second cylinder 103, and is provided inside the second cylinder 103.

  As shown in FIG. 9, the first cylinder 102 is provided on the upper end side of the first cylinder 102, and introduces a heating medium 104 that introduces a heat medium that evaporates VOC existing in the contaminated soil in the soil. Have Moreover, the 1st cylinder 102 has the discharge port 105 which is provided in the lower end side of the 1st cylinder 102, and discharge | releases the heat medium introduced from the inlet 104 to soil as shown in FIG. Moreover, the 1st cylinder 102 has the 1st flow path 106 which connects the inlet 104 provided in the upper end side, and the discharge port 105 provided in the lower end side, as shown in FIG.

  As shown in FIG. 9, the introduction port 104 is an open end on the upper end side of the first cylinder 102, in other words, an upper end inner peripheral portion of the first cylinder 102. The cross section of the introduction port 104 perpendicular to the axial direction of the first cylinder 102 is circular. Here, an example in which the upper end of the first cylinder 102 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the first cylinder 102. . In this case, the introduction port 104 is at least one opening formed in a lid (not shown).

  As shown in FIG. 10, the discharge port 105 is formed on the bottom surface 110 of the first cylinder 102. Here, an example in which the lower end of the first cylinder 102 is a closed end provided with the discharge port 105 is shown, but the lower end of the first cylinder 102 may be an open end (not shown). In this case, the discharge port 105 is an open end (not shown) on the lower end side of the first cylinder 102.

  As shown in FIG. 9, the first flow path 106 is provided along the axial direction of the first cylinder 102. The cross section of the first flow path 106 perpendicular to the axial direction of the first cylinder 102 is circular. The first flow path 106 circulates the heat medium introduced from the outside of the soil contaminant collection structure 1 through the inlet 104 to the lower end side of the first cylinder 102 as indicated by an arrow A101. Then, the heat medium that has circulated in the first flow path 106 to the lower end side of the first cylinder 102 is discharged to the outside of the soil contaminant collection structure 100 through the discharge port 105.

  As shown in FIG. 9, the second cylinder 103 is provided on the lower end side of the second cylinder 103 and evaporates in the soil by the heat medium released from the discharge port 105 provided in the first cylinder 102. A recovery port 107 for recovering the VOC is provided. The second cylinder 103 is provided on the upper end side of the second cylinder 103 and has a discharge port 108 for discharging VOC recovered from the recovery port 107 to the ground. The second cylinder 103 has a second flow path 109 that connects the recovery port 107 provided on the lower end side and the discharge port 108 provided on the upper end side.

  As shown in FIG. 9, the recovery port 107 is formed on the side surface on the lower end side of the second cylinder 103. The discharge port 105 is formed on the lower end side with respect to the recovery port 107. Here, an example is shown in which the collection port 107 is provided in a plurality of stages over the entire circumference of the side surface on the lower end side of the second cylindrical body 103, but the collection port 107 may be provided in one stage, and is provided in a part of the side surface. Also good.

  Moreover, although an example in which the lower end of the second cylinder 103 is a closed end is shown, at least one opening (not shown) may be provided on the bottom surface of the second cylinder 103, and the lower end of the second cylinder 103 is It may be an open end (not shown). When at least one opening (not shown) is provided on the bottom surface of the second cylinder 103, the opening (not shown) also constitutes the recovery port 107. Further, when the lower end of the second cylinder 103 is an open end (not shown), the open end (not shown) also constitutes the recovery port 107, and the inner peripheral surface of the second cylinder 103 and the outer peripheral surface of the first cylinder 102 Formed between. A cross section of an open end (not shown) perpendicular to the axial direction of the second cylinder 103 is annular.

  As shown in FIG. 9, the discharge port 108 is an open end on the upper end side of the second cylinder 103, and an inner peripheral surface on the upper end side of the second cylinder 103 and an outer peripheral surface on the upper end side of the first cylinder 102. Formed between. The cross section of the discharge port 108 perpendicular to the axial direction of the second cylinder 103 is annular. Here, an example in which the upper end of the second cylinder 103 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the second cylinder 103. . In this case, the discharge port 108 is at least one opening formed in a lid (not shown).

  As shown in FIG. 9, the second flow path 109 is provided along the axial direction of the second cylinder 103. The cross section of the second flow path 109 perpendicular to the axial direction of the second cylinder 103 is annular. The second flow path 109 circulates the VOC recovered from the outside of the soil pollutant recovery structure 1 through the recovery port 107 to the upper end side of the second cylinder 103 as indicated by an arrow A102. Then, the VOC that has circulated in the second flow path 109 to the upper end side of the second cylinder 103 is discharged to the outside of the soil contaminant collection structure 100 through the discharge port 108.

  The soil contaminant collection structure 100 may further include a foreign matter removing unit 111 that removes foreign matter contained in a fluid other than VOC and VOC collected from the collection port 107. FIG. 11 is an upper perspective view schematically showing the soil pollutant recovery structure 100 including the foreign matter removing unit 111. As shown in FIG. 11, the foreign substance removing unit 111 is provided at the entrance of the recovery port 107 of the soil contaminant collection structure 100. The foreign matter removal unit 111 prevents foreign matter from entering the second flow path 109 from the recovery port 107 and suppresses the foreign matter from entering the second flow path 109.

  The foreign substance removing unit 111 is provided between the inner peripheral surface of the second cylinder 103 and the outer peripheral surface of the first cylinder 102 at the lower end in the second flow path 109. The cross section of the foreign substance removal unit 111 perpendicular to the axial direction of the first cylinder 102 is annular. The diameter of the foreign substance removing unit 111 is larger than the diameter of the first cylinder 102 and smaller than the diameter of the second cylinder 103.

  In addition, the soil contaminant collection structure 100 may further include a gas-liquid separation unit 112 that separates a liquid component from a gas component such as VOC or a fluid other than VOC collected from the collection port 107. FIG. 12 is an upper perspective view schematically showing the soil contaminant collection structure 100 including the gas-liquid separator 112. As shown in FIG. 12, the gas-liquid separator 112 is provided at the entrance of the recovery port 107 of the soil contaminant collection structure 100. When the liquid component of the fluid other than VOC or VOC is recovered from the recovery port 107, the gas-liquid separation unit 112 separates these liquid component and gas component recovered from the recovery port 107, and selectively selects these components. The gas component is circulated in the second flow path 109.

  The gas-liquid separator 112 is provided between the inner peripheral surface of the second cylinder 103 and the outer peripheral surface of the first cylinder 102 at the lower end in the second flow path 109. The cross section of the gas-liquid separator 112 perpendicular to the axial direction of the first cylinder 102 is annular. The diameter of the gas-liquid separator 112 is larger than the diameter of the first cylinder 102 and smaller than the diameter of the second cylinder 103.

  Hereinafter, effects common to the second embodiment and its modifications will be described. According to the second embodiment, the same effect as that of the first embodiment can be obtained. That is, by providing the soil pollutant recovery structure 100 with a so-called double cylinder structure, the supply of the heat medium for evaporating the VOC and the recovery of the evaporated VOC are performed in the soil pollutant recovery structure 100. Is possible. Therefore, it is not necessary to insert the cylinder for soil heating and the cylinder for VOC recovery into the soil at positions separated from each other. The amount of work and work time when installing the soil pollutant recovery structure 100 and the soil pollutant recovery device are shortened, so that from the installation of the soil pollutant recovery device to the removal of VOC and the recovery of the soil pollutant recovery device. There is an effect that work efficiency becomes high.

  Furthermore, similarly to the first embodiment, the soil pollutant recovery structure can perform VOC evaporation and recovery at the same time, and can reduce the VOC recovery time.

  Further, the configuration of the soil contaminant collection structure 100 and the configuration of the soil contaminant collection structure 1 are switched, that is, a heat medium is introduced into the first cylinder 102 that is the inner cylinder of the soil contaminant collection structure 100. A configuration in which VOC is discharged from between the second cylinder 103 and the first cylinder 102, which are outer cylinders, and a heat medium is introduced between the second cylinder 103 and the first cylinder 102 to introduce the first When the configuration for discharging VOC from the cylinder 102 is switched, clogging such as a discharge port, a recovery port, a foreign material removal unit, and a gas-liquid separation unit due to the foreign material can be removed.

(Third embodiment)
FIG. 13 is an upper perspective view schematically showing the soil contaminant collection structure 200 of the third embodiment. In the following embodiment, the same components as those of the soil pollutant recovery structure 1 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  In the soil pollutant recovery structure 200 of the third embodiment, the configuration of the soil pollutant recovery structure 1 of the first embodiment is different except that the configurations of the first cylinder 202 and the first partition 213 are different. And basically the same. Therefore, here, the different configuration will be mainly described.

  As shown in FIG. 13, the soil contaminant collection structure 200 includes a plate-like first partition portion 213 that divides the inside of the first cylinder 202 in the radial direction. The first partition 213 extends between the upper end and the lower end of the first cylinder 202 along the axial direction of the first cylinder 202, and divides the space in the first cylinder 202 horizontally in the axial direction. To do. Here, an example in which the first partition part 213 passes through the central axis of the first cylinder 202 is shown, but the first partition part 213 may not pass through the central axis of the first cylinder 202.

  The first cylinder 202 is provided on the upper end side of the first cylinder 202 and has an introduction port 204 that is an opening of the first flow path 206 and a discharge port 208 that is an opening of the second flow path 209. The introduction port 204 and the discharge port 208 are divided by the first partition part 213. The introduction port 204 opens to the first flow path 206 and can be connected to a heat medium generator that generates heated gas. The discharge port 208 is open to the second flow path 209. The first cylinder 202 is provided on the lower end side of the first cylinder 202 and has a discharge port 205 that is an opening of the first flow path 206 and a recovery port 207 that is an opening of the second flow path 209. . The discharge port 205 and the recovery port 207 are divided by the first partition part 213. The discharge port 205 is provided in a portion of the wall surface of the first cylinder 202 constituting the first flow path 206 that can be embedded in soil. The recovery port 207 is provided in a portion of the wall surface of the first cylindrical body 202 constituting the second flow path 209 that can be embedded in soil.

  The first cylindrical body 202 has a first flow path 206 that connects the introduction port 204 and the discharge port 205 and is a space partitioned by the first partition portion 213. The first flow path 206 is configured by the first partition portion 213 and the inner surface of the first cylindrical body 202. The first cylindrical body 202 has a second flow path 209 that connects the collection port 207 and the discharge port 208 and is a space partitioned by the first partition portion 213. The second flow path 209 is configured by the first partition 213 and the inner surface of the first cylindrical body 202, and is a space different from the first flow path 206.

  The introduction port 204 and the discharge port 208 are open ends on the upper end side of the first cylindrical body 202, and are divided by the first partition part 213. The introduction port 204 and the discharge port 208 are respectively formed by the inner peripheral surface on the upper end side of the first cylinder 202 and the first partition portion 213. The cross section of the introduction port 204 and the discharge port 208 perpendicular to the axial direction of the first cylinder 202 is semicircular. Here, an example in which the upper end of the first cylinder 202 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the first cylinder 202. . In this case, the introduction port 204 and the discharge port 208 are at least one opening formed in a lid (not shown).

  The discharge port 205 and the recovery port 207 are formed on the side surface on the lower end side of the first cylinder 202. Here, an example is shown in which the discharge port 205 and the recovery port 207 are provided in a plurality of stages over the entire side surface on the lower end side of the first cylindrical body 202. However, the discharge port 205 and the recovery port 207 may be one level, You may provide in a part of side surface.

  Moreover, although an example in which the lower end of the first cylinder 202 is a closed end is shown, at least one opening (not shown) may be provided on the bottom surface of the first cylinder 202, and the lower end of the first cylinder 202 is It may be an open end (not shown). When at least one opening (not shown) is provided on the bottom surface of the first cylinder 202, the opening (not shown) also forms the discharge port 205 and the recovery port 207. Further, when the lower end of the first cylinder 202 is an open end (not shown), the open end (not shown) also constitutes the discharge port 205 and the recovery port 207, and the inner peripheral surface of the first cylinder 202 and the first partition portion 213. A cross section of an open end (not shown) perpendicular to the axial direction of the first cylindrical body 202 is semicircular.

  The first flow path 206 is provided along the axial direction of the first cylindrical body 202. The cross section of the first flow path 206 perpendicular to the axial direction of the first cylindrical body 202 is semicircular. The first flow path 206 distributes the heat medium introduced through the introduction port 204 to the lower end side of the first cylindrical body 202 as indicated by an arrow A201. Then, the heat medium that circulates in the first flow path 206 to the lower end side of the first cylindrical body 202 is discharged to the outside of the soil contaminant collection structure 200 through the discharge port 205.

  The second flow path 209 is provided along the axial direction of the first cylindrical body 202. The cross section of the second flow path 209 perpendicular to the axial direction of the first cylindrical body 202 is semicircular. The second flow path 209 causes the VOC recovered through the recovery port 207 to flow to the upper end side of the first cylindrical body 202 as indicated by an arrow A202. Then, the VOC that circulates in the second flow path 209 to the upper end side of the first cylinder 202 is discharged to the outside of the soil contaminant collection structure 200 through the discharge port 208. The first flow path 206 and the second flow path 209 are completely separated by the first partition portion 213.

  As described above, according to the soil pollutant recovery structure 200 of the third embodiment, the soil contaminated by the VOC is heated by the heat medium discharged from the discharge port 205 divided by the first partition part 213. However, the VOC in the soil evaporated by the heating of the heat medium can be recovered from the recovery port 207 divided by the first partition 213. Therefore, it is not necessary to insert the cylinder for soil heating and the cylinder for VOC recovery into the soil at positions separated from each other. The amount of work and work time when installing the soil pollutant recovery structure 200 and the soil pollutant recovery device are shortened. Therefore, from installation of the soil pollutant recovery device to VOC removal and recovery of the soil pollutant recovery device. There is an effect that work efficiency becomes high.

  Further, the soil pollutant recovery structure 200 divides the heat medium from the discharge port 207 by circulating the heat medium to the lower end side in the first flow path 206 and releasing it from the discharge port 205 to recover the VOC from the recovery port 207. Thus, it can be circulated to the upper end side in the second flow path 209. Therefore, the soil pollutant recovery structure 200 can simultaneously perform the evaporation and recovery of the VOC and reduce the VOC recovery time.

  As shown in FIG. 13, the soil contaminant collection structure 200 has a configuration in which a first flow path 206 is provided on the right side of the first cylinder 202 and a second flow path 209 is provided on the left side of the first cylinder 202. However, the soil contaminant collection structure 200 may have a configuration in which the first channel 206 is provided on the left side of the first cylinder 202 and the second channel 209 is provided on the right side of the first cylinder 202.

  The soil contaminant collection structure 200 may include the second cylinder 3 described above. When the soil pollutant collection structure 200 includes the second cylinder 3, the first partition 213 may or may not divide the inside of the second cylinder 3.

(Fourth embodiment)
FIG. 14 is an upper perspective view schematically showing the soil contaminant collection structure 300 of the fourth embodiment. In the following embodiment, the same components as those of the soil pollutant recovery structure 1 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  In the soil contaminant collection structure 300 according to the fourth embodiment, the soil contamination according to the first embodiment is different except that the configurations of the first cylinder 302, the first partition 313, and the second partition 314 are different. The configuration is basically the same as that of the substance recovery structure 1. Therefore, here, the different configuration will be mainly described.

  As shown in FIG. 14, the soil contaminant collection structure 300 includes a plate-like first partition 313 and a second partition 314 that divide the inside of the first cylinder 302 in the radial direction. The first partition portion 313 and the second partition portion 314 extend between the upper end and the lower end of the first cylinder 302 along the axial direction of the first cylinder 302. The second partition part 314 rotates by a predetermined angle with respect to the first partition part 313 and intersects the first partition part 313. Here, an example in which the first partition portion 313 and the second partition portion 314 pass through the central axis of the first cylindrical body 302 is shown, but the first partition portion 313 and the second partition portion 314 are the central axis of the first cylindrical body 302. You do not have to go through. In addition, although an example in which the first partition portion 313 and the second partition portion 314 extend perpendicularly to each other is shown, the first partition portion 313 and the second partition portion 314 intersect at an angle other than vertical. May be.

  The first cylinder 302 is provided on the upper end side of the first cylinder 302 and has an inlet 304 and an outlet 308 that are separated by a first partition 313 and a second partition 314. The first cylinder 302 has a discharge port 305 and a recovery port 307 that are provided on the lower end side of the first cylinder 302 and are partitioned by the first partition 313 and the second partition 314. The first cylindrical body 302 has a first flow path 306 that connects the introduction port 304 and the discharge port 305 and is partitioned by the first partition 313 and the second partition 314. The first cylindrical body 302 has a second flow path 309 that connects the recovery port 307 and the discharge port 308 and is divided by the first partition 313 and the second partition 314.

  The introduction port 304 and the discharge port 308 are open ends on the upper end side of the first cylindrical body 302, and are divided by the first partition portion 313 and the second partition portion 314. The introduction port 304 and the discharge port 308 are formed by the inner peripheral surface on the upper end side of the first cylindrical body 302, the first partition portion 313, and the second partition portion 314, respectively. The cross section of the inlet 304 and the outlet 308 perpendicular to the axial direction of the first cylinder 302 has a fan shape. Here, an example in which the upper end of the first cylinder 302 is an open end is shown, but a lid (not shown) having at least one opening may be provided at the open end on the upper end side of the first cylinder 302. . In this case, the introduction port 304 and the discharge port 308 are at least one opening formed in a lid (not shown).

  The discharge port 305 and the recovery port 307 are formed on the side surface on the lower end side of the first cylinder 302. Here, an example in which the discharge port 305 and the recovery port 307 are provided in a plurality of stages over the entire circumference of the side surface on the lower end side of the first cylindrical body 302 is shown. You may provide in a part of side surface.

  Further, although an example in which the lower end of the first cylinder 302 is a closed end is shown, at least one opening (not shown) may be provided on the bottom surface of the first cylinder 302, and the lower end of the first cylinder 302 is It may be an open end (not shown). When at least one opening (not shown) is provided on the bottom surface of the first cylindrical body 302, the opening (not shown) also configures the discharge port 305 and the recovery port 307. When the lower end of the first cylinder 302 is an open end (not shown), the open end (not shown) also forms the discharge port 305 and the recovery port 307, and the inner peripheral surface of the first tube 302 and the first partition portion 313 and the second partition 314 are formed. A cross section of an open end (not shown) perpendicular to the axial direction of the first cylindrical body 302 has a fan shape.

  The first flow path 306 is provided along the axial direction of the first cylindrical body 302. The cross section of the first flow path 306 perpendicular to the axial direction of the first cylindrical body 302 has a fan shape. The first flow path 306 causes the heat medium introduced through the introduction port 304 to flow to the lower end side of the first cylindrical body 302 as indicated by an arrow A301. Then, the heat medium that circulates in the first flow path 306 to the lower end side of the first cylinder 302 is discharged to the outside of the soil contaminant collection structure 300 through the discharge port 305.

  The second flow path 309 is provided along the axial direction of the first cylindrical body 302. The cross section of the second flow path 309 perpendicular to the axial direction of the first cylindrical body 302 has a fan shape. The second flow path 309 distributes the VOC recovered through the recovery port 307 to the upper end side of the first cylinder 302 as indicated by an arrow A302. Then, the VOC that has circulated in the second flow path 309 to the upper end side of the first cylinder 302 is discharged to the outside of the soil contaminant collection structure 300 via the discharge port 308. The first channel 306 and the second channel 309 are completely separated by the first partition 313 and the second partition 314.

  As described above, according to the soil contaminant collection structure 300 of the fourth embodiment, the soil contaminated by the VOC is discharged from the discharge port 305 divided by the first partition 313 and the second partition 314. While being heated by the heated medium, the VOC in the soil evaporated by the heating of the heat medium can be recovered from the recovery port 307 divided by the first partition 313 and the second partition 314. Therefore, it is not necessary to insert the cylinder for soil heating and the cylinder for VOC recovery into the soil at positions separated from each other. The amount of work and work time when installing the soil pollutant recovery structure 300 and the soil pollutant recovery device are shortened, so that from the installation of the soil pollutant recovery device to the removal of VOC and the recovery of the soil pollutant recovery device There is an effect that work efficiency becomes high.

  Further, the soil pollutant recovery structure 300 divides the heat medium from the discharge port 307 by circulating the heat medium to the lower end side in the first flow path 306 and releasing it from the discharge port 305 to recover the VOC from the recovery port 307. Can be circulated to the upper end side in the second flow path 309. Therefore, the soil pollutant recovery structure 300 can simultaneously perform the evaporation and recovery of the VOC, and can reduce the VOC recovery time.

  As shown in FIG. 14, the soil contaminant collection structure 300 has a configuration in which first flow paths 306 and second flow paths 309 are alternately provided along the circumferential direction of the first cylindrical body 302. The soil contaminant collection structure 300 may have a configuration in which the first flow path 306 is continuously provided along the circumferential direction of the first cylinder 302 or a configuration in which the second flow path 309 is continuously provided. There may be.

  The soil pollutant recovery structure 300 has two first flow paths 306 and two second flow paths 309, but the soil pollutant recovery structure 300 includes one first flow path 306 and two second flow paths 309. The configuration may include three second flow paths 309 or the configuration including three first flow paths 306 and one second flow path 309. For example, when the soil contaminant collection structure 300 has one first flow path 306 and three second flow paths 309, one of the two first flow paths 306 shown in FIG. The introduction port 304 is a discharge port 308 and the discharge port 305 is a recovery port 307.

  In addition to the first partition 313 and the second partition 314, the soil contaminant collection structure 300 further includes one or more partitions that divide the inside of the first cylinder 302 in the radial direction. Also good. When the soil pollutant collection structure 300 further includes a partition portion, the first cylindrical body 302 has one or more flow paths formed by the partition section in addition to the first flow path 306 and the second flow path 309. It has further.

  The soil contaminant collection structure 300 may include the second cylinder 3 described above. When the soil pollutant collection structure 300 includes the second cylinder 3, the first partition 313 and the second partition 314 may or may not divide the inside of the second cylinder 3. .

(Fifth embodiment)
FIG. 15 is a conceptual diagram schematically showing a soil contaminant collection apparatus 600 according to the fifth embodiment. In the embodiment described below, the same components as those of the soil pollutant recovery apparatus 500 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  As shown in FIG. 15, the soil pollutant recovery device 600 combusts and decomposes the soil pollutant recovery structure 1 and the gaseous component of VOC discharged from the discharge port 8 of the soil pollutant recovery structure 1. And a heat decomposer 654 for introducing the heat medium generated by the combustion decomposition from the inlet 4 of the soil pollutant recovery structure 1. The thermal cracker 654 uses the VOC catalytic combustion method, and reuses the heat medium generated by the combustion decomposition of the VOC for the evaporation of the VOC in the soil 520. The heat medium generated by the combustion decomposition of VOC evaporates VOC present in the contaminated soil 520 in the soil 520.

  FIG. 16 is a schematic view schematically showing the heat decomposer 654. As shown in FIG. 16, the thermal cracker 654 includes a heating unit 654a, a catalyst unit 654b, and a heat exchange unit 654c. The heating unit 654a heats the VOC to a predetermined temperature in order to decompose the VOC in the catalyst unit 654b. The catalyst portion 654b is filled with a platinum-based or palladium-based catalyst. The heat exchange part 654c consists of a heat exchanger.

  As shown in FIGS. 15 and 16, the gaseous component of VOC discharged from the discharge port 8 of the soil pollutant recovery structure 1 passes through the heat exchange unit 654c, absorbs heat, and is introduced into the heating unit 654a. The VOC flowing into the heating unit 654a is heated to a temperature necessary for being decomposed by the catalyst accommodated in the catalyst unit 654b. The VOC heated by the heating unit 654a is introduced into the catalyst unit 654b and is selectively decomposed by catalytic combustion in the catalyst unit 654b. And the fluid which decomposed | disassembled VOC is thermally radiated when passing the heat exchange part 654c, and is introduce | transduced into the 1st flow path 6 from the inlet 4 of the soil contaminant collection structure 1 as a heat carrier. Since the temperature of the fluid in which the VOC is decomposed is higher than that of the fluid in which the VOC is contained, the gas containing the VOC deprives the heat of the fluid in which the VOC has been decomposed in the heat exchange unit 654c.

  In addition, as shown in FIG. 15, the soil contaminant collection device 600 may further include a suction device 551. Here, an example in which the suction device 551 is provided immediately before the thermal decomposition device 654 is shown, but the suction device 551 may be provided immediately after the thermal decomposition device 654. Further, the fluid obtained by decomposing the VOC may be further heated by a heating unit (not shown) before flowing again from the inlet 4.

  As described above, according to the soil contaminant collection apparatus 600 of the fifth embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, the heat generated by the VOC catalytic combustion can be given to the gas before the VOC is decomposed by the heat exchange unit 654c, and the amount of heat given by the heating unit 654a can be reduced. Further, since the fluid that has decomposed the VOC that has passed through the heat exchanging portion 654c and still has a certain amount of heat is used as a heating medium for introducing into the soil pollutant recovery structure 1, the energy required for VOC recovery and decomposition Can be reduced.

  In FIG. 15, the soil pollutant recovery device 600 is configured to include the soil pollutant recovery structure 1, but the soil pollutant recovery device 600 is one of the soil pollutant recovery structures 100, 200, 300. The structure which comprises may be sufficient.

(Sixth embodiment)
FIG. 17 is a conceptual diagram schematically showing a soil contaminant collection apparatus 700 according to the sixth embodiment. In the following embodiment, the same components as those of the soil pollutant recovery structure 1 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  The soil contaminant collection device 700 collects VOCs present in the soil 720a in the aquifer 720 containing groundwater and purifies the soil 720a. As shown in FIG. 17, the soil pollutant recovery device 700 includes a soil pollutant recovery structure 1, a pump 757 provided in the second cylinder 3, and a liquid component of VOC discharged from the discharge port 8. And an evaporator 755 for evaporating the gas to generate a gaseous VOC. The pump 757 pumps up the fluid containing the VOC liquid component and the gas component recovered from the recovery port 7 as indicated by an arrow A704 in the second flow path 9 as indicated by an arrow A2. The evaporator 755 connected to the discharge port 8 supplies the generated gaseous VOC to any of the above-described adsorber 552, a decomposer (not shown), and a heat decomposer 654. The evaporator 755 removes VOC from the fluid discharged from the discharge port 8 by, for example, an aeration process using the difference between the vapor pressure of VOC and the vapor pressure of water, and generates a gaseous VOC.

  The soil pollutant recovery apparatus 700 heats the air blower 756 that supplies air to the evaporator 755 and the fluid from which the VOC has been removed by the evaporator 755, and uses the generated water vapor as the inlet of the soil pollutant recovery structure 1. 4 and a heat medium generator 750 introduced from 4.

  Since the soil pollutant collection device 700 purifies the soil 720a of the aquifer 720, the fluid discharged from the discharge port 8 is mainly the groundwater pumped by the gaseous VOC or the pump, or the liquid VOC. Consists of. The fluid pumped from the lower end of the second flow path 9 by the pump 757 and discharged from the discharge port 8 is introduced into the evaporator 755. The fluid that has flowed into the evaporator 755 is aerated using air supplied from the blower 756 to the evaporator 755. Then, the liquid VOC contained in the fluid is evaporated to become a gaseous VOC, and the VOC is removed from the fluid. The gaseous VOC generated by the aeration process of the evaporator 755 is supplied to the adsorber 552, the decomposer (not shown), the thermal decomposer 654, etc. together with the gaseous VOC contained in the fluid, and appropriately processed. Is done.

  The fluid from which the VOC has been removed by the evaporator 755 is introduced into the water storage tank 758 and stored in the water storage tank 758, and is also introduced into the heat medium generator 750 and heated. The fluid introduced into the heat medium generator 750 is mainly groundwater. The heat medium generator 750 heats the fluid to generate water vapor. And the water vapor | steam produced | generated with the heat-medium generator 750 is introduce | transduced into the 1st flow path 6 from the inlet of the soil pollutant collection structure 1 as a heat medium. And the heat medium in the 1st flow path 6 is discharge | released to the soil 720a like arrow A703 through the discharge port 5 from the lower end side of the soil pollutant collection structure 1. FIG. Further, the water vapor generated by the heat medium generator 750 is introduced into the evaporator 755 and used for the aeration process.

  In addition, the soil contaminant collection device 700 may further include a suction device (not shown) for sucking gas from the discharge port 8. An aspirator (not shown) has the same configuration as the aspirator described above.

  As described above, according to the soil pollutant recovery apparatus 700 of the sixth embodiment, it can be processed even if the soil to be decontaminated is an aquifer and is the same as that of the first embodiment. An effect can be obtained.

  In addition, although the soil pollutant collection | recovery apparatus 700 is a structure which comprises the soil pollutant collection structure 1, the soil pollutant collection apparatus 700 is a structure which comprises either of the soil pollutant collection structures 100, 200, 300. There may be.

  According to at least one embodiment described above, it is possible to efficiently recover VOC evaporated by heating from soil contaminated with VOC without inserting a plurality of conventional cylinders into the soil. it can.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1,100,200,300 ... Soil pollutant collection structure, 2,102,202,302 ... 1st cylinder, 3,103 ... 2nd cylinder, 4,104,204,304 ... introduction port, 5, 105, 205, 305 ... discharge port, 6, 106, 206, 306 ... first flow path, 7, 107, 207, 307 ... recovery port, 8, 108, 208, 308 ... discharge port, 9, 109, 209, 309 ... 2nd flow path, 10,110 ... bottom surface, 11,111 ... foreign substance removal part, 12,112 ... gas-liquid separation part, 213,313 ... 1st partition part, 314 ... 2nd partition part, 500,600, 700 ... Soil pollutant recovery device, 520 ... Soil, 550,750 ... Heat medium generator, 551 ... Suction device, 552 ... Adsorber, 654 ... Heat cracker, 654a ... Heating unit, 654b ... Catalyst unit, 654c ... Heat Exchange section, 720 ... Aquifer 720a ... soil, 755 ... the evaporator, 756 ... blower, 757 ... pumping unit, 758 ... water storage tank.

Claims (11)

A first cylinder having a first end that can be embedded in soil, and a second end that can protrude into the atmosphere;
A third end provided on the inner side of the first cylindrical body and parallel to the long axis of the first cylindrical body, provided on the first end side, and provided on the second end side. A second cylinder having four ends;
A first opening provided in a portion of the first cylindrical body that can be embedded in soil;
A second opening that is provided in a portion of the first cylinder that can protrude into the atmosphere and that can be connected to a heat medium generator that generates heated gas;
A fourth opening provided at the fourth end;
Have
The third end is provided at the same position as the first end in the major axis direction of the first cylinder or at a position protruding from the first end.
A soil contaminant collection structure in which a third opening is provided at the third end.   The soil contaminant collection structure according to claim 1, wherein the fourth opening is connectable to a suction device that sucks fluid in the second cylinder.   The soil pollutant collection structure according to claim 1 or 2, further comprising a foreign matter removing unit that prevents foreign matter from entering the second cylinder in the third opening.   The soil pollutant collection structure according to any one of claims 1 to 3, further comprising a gas-liquid separation unit that separates a gas component and a liquid component in the third opening. A first cylinder having a first end that can be embedded in soil, and a second end that can protrude into the atmosphere;
A third end provided on the inner side of the first cylindrical body and parallel to the long axis of the first cylindrical body, provided on the first end side, and provided on the second end side. A second cylinder having four ends;
A first opening provided in a portion of the first cylindrical body that can be embedded in soil;
A second opening provided in a portion of the first cylinder that can project into the atmosphere;
A fourth opening provided at the fourth end and connectable to a heat medium generator for generating heated gas;
Have
The third end is provided at the same position as the first end in the major axis direction of the first cylinder or at a position protruding from the first end.
A soil contaminant collection structure in which a third opening is provided at the third end. A first cylinder having a first end that can be embedded in soil, and a second end that can protrude into the atmosphere;
At least one partition that horizontally divides the space in the first cylinder in the long axis direction;
A first space constituted by the partition plate and an inner surface of the first cylindrical body;
A second space different from the first space constituted by the partition plate and the inner surface of the first cylindrical body;
A first opening provided in a portion of the wall surface of the first cylindrical body constituting the first space that can be embedded in soil;
A second opening provided in a portion of the wall surface of the first cylinder constituting the second space that can be embedded in soil;
A fourth opening provided at the second end and opening into the second space;
A soil pollutant recovery structure having a third opening that is open to the first space and is connectable to a heat medium generator that generates heated gas. A first cylinder having a first end that can be embedded in soil, and a second end that can protrude into the atmosphere;
A third end provided on the inner side of the first cylindrical body and parallel to the long axis of the first cylindrical body, provided on the first end side, and provided on the second end side. A second cylinder having four ends;
A first opening provided in a portion of the first cylindrical body that can be embedded in soil;
A second opening connected to a heat medium generator for generating heated gas, provided in a portion of the first cylinder that can protrude into the atmosphere;
A fourth opening provided at the fourth end,
The third end portion is provided at the same position as the first end portion or a position protruding from the first end portion in the long axis direction of the first cylindrical body, and the third end portion includes A soil pollutant recovery structure provided with a third opening;
The heating medium generator connected to the second opening;
A soil pollutant recovery device.   The soil pollutant collection device according to claim 7, further comprising a suction device connected to the fourth opening and sucking a fluid in the second cylinder.   The soil pollutant collection apparatus according to claim 8, further comprising a decomposer that is provided between the fourth opening and the suction device and decomposes a gaseous component of a volatile organic compound. A liquid suction part that is provided inside the second cylinder and sucks liquid;
The soil contamination according to claim 7, further comprising an evaporator connected to the fourth opening to evaporate a liquid volatile organic compound contained in the liquid into a gaseous volatile organic compound. Material recovery device. A first cylinder having a first end that can be embedded in soil, and a second end that can protrude into the atmosphere;
A third end provided on the inner side of the first cylindrical body and parallel to the long axis of the first cylindrical body, provided on the first end side, and provided on the second end side. A second cylinder having four ends;
A first opening provided in a portion of the first cylindrical body that can be embedded in soil;
A second opening provided in a portion of the first cylinder that can project into the atmosphere;
A fourth opening provided at the fourth end and connected to a heat medium generator for generating heated gas;
The third end portion is provided at the same position as the first end portion or a position protruding from the first end portion in the long axis direction of the first cylindrical body, and the third end portion includes A soil pollutant recovery structure provided with a third opening;
The heating medium generator connected to the fourth opening;
A soil pollutant recovery device.

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