JP2007032223A - Contaminated groundwater removal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost contaminated groundwater removing device capable of preventing the groundwater level around processing from being lowered and capable of efficiently pumping and removing contaminated groundwater over time.
In a contaminated groundwater removal apparatus 10 in which contaminated groundwater F in the ground 11 is collected at one place and sucked and removed to the ground 11a by a pump 22 and a pumping pipe 23, a water tank is placed in the ground 11. 15, a water collecting pipe 20 having a plurality of small holes 20 a is buried in the contaminated area E in the ground 11 below the water storage tank 15, and the water collecting pipe 20 and the water storage tank 15 are connected to the connecting pipe 21. In this water tank 15, the contaminated groundwater F can be stored freely by the head difference S with the water level d of the groundwater D in the ground 11, and the contaminated groundwater F stored in the water tank 15 is stored in the water tank 15. A pump 22 is disposed for sucking and removing the water to the ground 11a through the pumping pipe 23.
[Selection] Figure 1

Description

  The present invention relates to a contaminated groundwater removing apparatus that efficiently sucks and removes contaminated groundwater.

  There exists what is shown in FIG. 3 as this kind of contaminated groundwater removal apparatus (for example, refer patent document 1). As shown in FIG. 3, this contaminated groundwater removal apparatus 1 has a vertical well 3 formed in the ground 2 up to the impermeable layer 2c, and the vertical well 3 includes a pump 4a and a pumping pipe 4b. A device 4 is provided. The pumping pipe 4b of the pumping device 4 extends to the ground 2a and is connected to the pollutant processing device 5A.

  Further, the vertical well 3 includes a gas-liquid separator 6 and a pumping pipe 7 for connecting open pipes 6 a and 7 a embedded in the sand layer 2 b of the ground 2 from the side wall 3 a of the vertical well 3. The pumping pipe 7 connected to the gas-liquid separator 6 extends to the ground 2a and is connected to a vacuum pump (decompressed suction device) 8 and a contaminant processing device 5B.

  The upper opening tube 7a is embedded in the highest contamination region R of the sand layer 2b, and the lower opening tube 6a is embedded below the highest contamination region R. Moreover, the code | symbol A shows the groundwater surface before purification | cleaning, and the code | symbol B shows the groundwater surface under purification | cleaning.

Then, the contaminated groundwater C collected from the upper opening pipe 7a is directly pumped up to the ground 2a by the vacuum pump 8 and processed and removed by the contaminant processing apparatus 5B. In addition, the contaminated groundwater C collected from the lower opening pipe 6a is accumulated in the bottom 3b of the vertical well 3, pumped up to the ground 2a by the pump 4a and the pumping pipe 4b, and processed and removed by the contaminant processing apparatus 5A. The
Japanese Patent Laid-Open No. 11-10130 (page 10, FIG. 8)

  However, in the conventional contaminated groundwater removal apparatus 1, the groundwater surface B being purified is greatly lowered to the bottom 3b side of the vertical well 3 that is lower than the lower opening pipe 6a. If treated, the ground 2 on the highest contamination region R side may sink, and in some cases, the building (building) 9 constructed on the ground 2a may be adversely affected.

  In addition, since the contaminated groundwater C collected from the lower opening pipe 6a is accumulated in the bottom 3b of the vertical well 3 opened on the upper surface side, the vaporized contaminated gas of the contaminated groundwater C leaks into the atmosphere or the vertical well 3 There was a risk of penetration into the sand layer 2b of the ground 2 from the side wall 3a.

  Furthermore, since large-scale devices such as the pumping device 4, the gas-liquid separator 6 and the vacuum suction device 8 are indispensable, the cost of the entire device is increased.

  Therefore, the present invention has been made to solve the above-described problems, can prevent the groundwater level around the treatment in the ground from falling, and efficiently pumps and removes contaminated groundwater over time. An object of the present invention is to provide a low-cost contaminated groundwater removal device capable of

  The invention of claim 1 is a contaminated groundwater removing apparatus which collects contaminated groundwater in the ground at one place and sucks and removes the groundwater by a pump and a pumping pipe, and embeds a water storage tank in the ground. In addition, a water collecting pipe having a plurality of small holes is buried in a contaminated area in the ground below the water storage tank, the water collecting pipe and the water storage tank are connected by a connecting pipe, and the ground is placed in the water storage tank. The contaminated groundwater can be stored freely by the head difference with the groundwater level in the inside, and a pump for sucking and removing the contaminated groundwater stored in the reservoir through the pumping pipe is disposed in the reservoir. It is characterized by that.

  The invention of claim 2 is the contaminated groundwater removing apparatus according to claim 1, wherein an opening is formed on the upper surface side of the water tank, and one end of the connecting pipe is connected to the bottom surface of the water tank. And the opening part of the said water storage tank was made freely sealable with the cover body, It is characterized by the above-mentioned.

  The invention of claim 3 is a polluted groundwater removing apparatus that collects contaminated groundwater in the ground in one place and sucks and removes the groundwater by a pump and a pumping pipe, and excavates a vertical hole in the ground. A water storage tank is disposed in the vertical hole, and a water collecting pipe having a plurality of small holes is buried in the contaminated area in the ground from the side wall of the vertical hole, and the water collecting pipe and the water storage tank are connected by a connecting pipe. Connected to make it possible to store the contaminated groundwater in the water tank by a head difference from the groundwater level in the ground, and to store the contaminated groundwater stored in the water tank in the water tank through a pumping pipe. It is characterized in that a pump for sucking and removing is disposed.

  The invention of claim 4 is the contaminated groundwater removal apparatus according to claim 3, wherein an opening is formed on the upper surface side of the water tank, and one end of the connecting pipe is connected to the bottom surface of the water tank. And the opening part of the said water storage tank was made freely sealable with the cover body, It is characterized by the above-mentioned.

  The invention of claim 5 is the contaminated groundwater removal apparatus according to claim 3, wherein the vertical hole is excavated to an impermeable layer, the water tank is suspended in the ground water in the vertical hole, and the vertical hole and the A water level sensor for controlling the amount of the contaminated groundwater stored therein is provided in the reservoir so that the level of the contaminated groundwater in the reservoir is lower than the level of the groundwater in the ground.

  As described above, according to the invention of claim 1, a water storage tank is embedded in the ground, and a water collecting pipe having a plurality of small holes is embedded in a contaminated region in the ground below the water storage tank, This water collecting pipe and the water tank are connected by a connecting pipe, and in this water tank, contaminated groundwater can be stored freely by the head difference with the groundwater level in the ground, and this water tank is stored in the water tank. By installing a pump that sucks and removes contaminated groundwater to the ground via a pumping pipe, the groundwater level around the treatment in the ground can be reliably prevented from falling, and the contaminated groundwater can be efficiently removed over time. Can be pumped up and removed. Thereby, ground subsidence around the treatment can be surely prevented, and the building constructed on the ground is not adversely affected.

  According to invention of Claim 2, while forming an opening part in the upper surface side of a water tank, one end of a connecting pipe is connected to the bottom face part of this water tank, and the opening part of a water tank can be sealed with a lid body As a result, it is possible to reliably recover undiluted high-concentration contaminated groundwater stored in the water tank, and even if the contaminated groundwater stored in the water tank evaporates, Leakage into the ground can be reliably prevented.

  According to the invention of claim 3, a vertical hole is excavated in the ground, a water storage tank is disposed in the vertical hole, and a water collecting pipe having a plurality of small holes in a contaminated region in the ground from the side wall of the vertical hole. It is buried and this water collecting pipe and the water storage tank are connected by a connecting pipe. In this water tank, the contaminated groundwater can be stored freely by the head difference with the groundwater level in the ground. By installing a pump that sucks and removes contaminated groundwater stored on the ground via a pumping pipe, the groundwater level around the treatment in the ground can be reliably prevented from falling, and the contaminated groundwater can be removed over time. Can be efficiently pumped and removed. Thereby, ground subsidence around the treatment can be surely prevented, and the building constructed on the ground is not adversely affected.

  According to invention of Claim 4, while forming an opening part in the upper surface side of a water tank, one end of a connection pipe is connected to the bottom face part of this water tank, and the opening part of a water tank can be sealed with a cover body freely As a result, it is possible to reliably recover undiluted high-concentration contaminated groundwater stored in the water tank, and even if the contaminated groundwater stored in the water tank evaporates, Leakage into the ground can be reliably prevented.

  According to the invention of claim 5, the vertical hole is excavated to the impermeable layer, the water tank is suspended in the ground water in the vertical hole, and the level of contaminated groundwater in the water tank is set in the vertical hole and the water tank. By providing water level sensors that control the amount of contaminated groundwater stored so that it is lower than the groundwater level in the ground, the level of contaminated groundwater in the water tank is always lower than the groundwater level in the surrounding ground. It is possible to maintain the water head difference, and it is possible to efficiently collect contaminated groundwater in the water tank over time.

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

  FIG. 1 is a sectional view showing a contaminated groundwater removing apparatus according to a first embodiment of the present invention.

  As shown in FIG. 1, the contaminated groundwater removal apparatus 10 collects contaminated groundwater F in the contaminated area E in the ground 11 in a water storage tank (one place) 15 and sucks it up to the ground 11 a with a pump 22 and a pump pipe 23. A bottomed and cylindrical water storage tank 15 is embedded in the ground 11. An opening 15 a on the upper surface side of the water storage tank 15 is exposed to the ground 11 a and is sealed with a lid 16.

  Further, a water collecting pipe 20 having a plurality of small holes 20a is embedded in a contaminated region E such as a gravel layer 11b below the water storage tank 15 in the ground 11 so as to extend in the lateral direction (horizontal direction). One end 20b of the water collecting pipe 20 and the bottom surface portion 15b of the water storage tank 15 are connected so as not to leak at both ends 21a and 21b of a connecting pipe 21 such as a hose.

  In the water tank 15, the contaminated groundwater F is stored by the head difference S between the water level f of the contaminated groundwater F in the water tank 15 and the water level d of the groundwater D in the ground 11. In addition, a pump 22 is provided in the water storage tank 15 to suck up the contaminated groundwater F stored in the water storage tank 15 to the ground via the pumping pipe 23 and supply it to the contaminant processing machine 24. Further, a water level sensor for controlling the amount of the contaminated groundwater F stored in the water tank 15 so that the water level f of the contaminated groundwater F in the water tank 15 is always lower than the water level d of the groundwater D in the ground 11. 25 is installed. That is, the water level sensor 25 installed in the water storage tank 15 activates the pump 22 to pump up the contaminated ground water F in the water storage tank 15 when the contaminated ground water F in the water storage tank 15 rises above a specified water level. It is structured.

  A building (building) 30 or the like is constructed on the ground 11a in the processing region of the ground 11.

  As described above, according to the contaminated groundwater removal apparatus 10 of the first embodiment, the water head difference S between the water level f of the contaminated groundwater F in the water tank 15 embedded in the ground 11 and the water level d of the groundwater D in the ground 11. The contaminated groundwater F is stored in the water storage tank 15, and the contaminated groundwater F stored in the water storage tank 15 is sucked up to the ground 11 a through the pump 22 and the pumping pipe 23, and processed and removed by the contaminant processing machine 24. By doing so, the descent of the water level d of the groundwater D around the treatment in the ground 11 can be reliably prevented, and the contaminated groundwater F in the water tank 15 can be efficiently pumped and removed over time. . Thereby, the ground subsidence around the processing can be surely prevented, and the building 30 constructed on the ground 11a is not adversely affected.

  Further, the opening 15 a is sealed with the lid 16 on the upper surface side of the water tank 15, and the one end 21 a of the connecting pipe 21 is connected to the bottom surface part 15 b of the water tank 15, so that the dilution stored in the water tank 15 It is possible to reliably collect high-concentration contaminated groundwater F, and to reliably grasp the contamination status of the contaminated area E. Furthermore, even if the contaminated groundwater F stored in the water tank 15 is vaporized, it is possible to reliably prevent the contaminants from leaking into the atmosphere or the ground 11.

  In addition, since a large-scale device as in the prior art is not required, the cost of the contaminated groundwater removal device 10 as a whole can be reduced accordingly. Furthermore, the operation time of the pump 22 can be adjusted by the diameter of the water storage tank 15, and the length of the water storage tank 15 and the installation position of the water level sensor 25 installed in the water storage tank 15 can be adjusted. The suction force of F can be adjusted.

  FIG. 2 is a sectional view showing a contaminated groundwater removing apparatus according to a second embodiment of the present invention.

  As shown in FIG. 2, the contaminated groundwater removal apparatus 10 ′ collects the contaminated groundwater F in the contaminated area E in the ground 11 in a water storage tank (one place) 15, and supplies it to the ground 11 a with a pump 22 and a pump pipe 23. It is sucked up and removed, and has a vertical hole 12 with a circular cross section excavated in the ground 11 to the impermeable layer 11c. A cylindrical peripheral wall (side wall) 13 made of concrete or the like is constructed in the vertical hole 12, and a bottomed and cylindrical water storage tank 15 is installed in a floating state in the ground water D in the peripheral wall 13. . The opening 15 a on the upper surface side of the water storage tank 15 is sealed with a lid 16. Further, a weight 17 is attached to the bottom surface portion 15b in the water storage tank 15 so that the water storage tank 15 does not fall down while floating.

  Furthermore, an opening 13a for supplying groundwater is formed in the upper part of the peripheral wall 13, and an opening 13b for sucking contaminated groundwater is formed in the lower part of the peripheral wall 13. A valve 14 is attached to the opening 13 a for supplying groundwater on the peripheral wall 13. Further, the water collecting pipe having a plurality of small holes 20a embedded in the contaminated area E such as the gravel layer 11b of the ground 11 so as to extend in the lateral direction (horizontal direction) in the opening 13b for sucking contaminated groundwater in the peripheral wall 13. The one end 20b side of 20 is penetrated. One end 20b of the water collecting pipe 20 and the bottom surface portion 15b of the water storage tank 15 are connected so as not to leak at both ends 21a and 21b of a connecting pipe 21 such as a hose.

  In the water tank 15, the contaminated groundwater F is stored by the head difference S between the water level f of the contaminated groundwater F in the water tank 15 and the water level d of the groundwater D in the ground 11. In addition, a pump 22 is provided in the water storage tank 15 to suck up the contaminated groundwater F stored in the water storage tank 15 to the ground via the pumping pipe 23 and supply it to the contaminant processing machine 24. Further, in the peripheral wall 13 and the water storage tank 15, the storage amount of the contaminated groundwater F is set so that the water level f of the contaminated groundwater F in the water storage tank 15 is always lower than the water level d of the groundwater D in the ground 11. Water level sensors 25 and 26 to be controlled are respectively installed. That is, the water level sensor 25 installed in the water storage tank 15 activates the pump 22 to pump up the contaminated ground water F in the water storage tank 15 when the contaminated ground water F in the water storage tank 15 rises above a specified water level. It is structured. Further, the water level sensor 26 installed in the peripheral wall 13 detects that the ground water D in the peripheral wall 13 and the water level d of the ground water D in the ground 11 are equal, and the water level d of the ground water D in the ground 11 is. When the water reaches a limit groundwater level d ′ that affects land subsidence, the pump 22 is stopped to stop pumping of the contaminated groundwater F more than necessary.

  During the initial installation in which the water storage tank 15 is suspended in the peripheral wall 13, the valve 14 attached to the opening 13 a of the groundwater supply is closed, and the water close to the water level d of the groundwater D in the ground 11 is closed in the peripheral wall 13. After the water tank 15 is suspended and installed therein, the valve 14 is opened to supply the groundwater D into the peripheral wall 13. Further, a building (building) 30 or the like is constructed on the ground surface 11a of the processing region of the ground 11.

  As described above, according to the contaminated groundwater removing apparatus 10 ′ of the second embodiment, the water level f of the contaminated groundwater F in the water storage tank 15 suspended in the groundwater D in the peripheral wall 13 and the water level d of the groundwater D in the ground 11. The contaminated groundwater F is stored in the water tank 15 due to the water head difference S, and the contaminated groundwater F stored in the water tank 15 is sucked up to the ground 11a through the pump 22 and the pumping pipe 23. By removing by processing, the water level of the ground water D in the peripheral wall 13 and the water level d of the ground water D around the processing in the ground 11 can always be made the same. Thereby, the fall of the water level d of the groundwater D around the process in the ground 11 can be reliably prevented, and the contaminated groundwater F in the water storage tank 15 can be efficiently pumped and removed over time. As a result, ground subsidence around the treatment can be reliably prevented, and the building 30 constructed on the ground 11a is not adversely affected.

  Further, the opening 15 a is sealed with the lid 16 on the upper surface side of the water tank 15, and the one end 21 a of the connecting pipe 21 is connected to the bottom surface part 15 b of the water tank 15, so that the dilution stored in the water tank 15 It is possible to reliably collect high-concentration contaminated groundwater F, and to reliably grasp the contamination status of the contaminated area E. Furthermore, even if the contaminated groundwater F stored in the water tank 15 is vaporized, it is possible to reliably prevent the contaminants from leaking into the atmosphere or the ground 11.

  Further, the vertical hole 12 is excavated to the impermeable layer 11 c, the water tank 15 is floated in the ground water D in the peripheral wall 13 covering the inner peripheral surface of the vertical hole 12, and the water storage is stored in the peripheral wall 13 and the water tank 15. By installing the water level sensors 25 and 26 for controlling the storage amount of the contaminated groundwater F so that the water level f of the contaminated groundwater F in the tank 15 is lower than the water level d of the groundwater D in the ground 11, The water level f of the contaminated groundwater F in 15 can always be kept lower than the water level d of the surrounding groundwater D in the ground 11, and the water head difference S can be reliably maintained. Thereby, the contaminated groundwater F can be collected and stored efficiently in the water tank 15 over time. Furthermore, by making the water storage tank 15 a floating body, it is possible to cope with a temporal change in the groundwater level.

  In addition, since a large-scale apparatus as in the prior art is not required, the cost of the contaminated groundwater removing apparatus 10 ′ can be reduced accordingly. Furthermore, the operation time of the pump 22 can be adjusted by the diameter of the water storage tank 15, and the length of the water storage tank 15 and the installation position of the water level sensor 25 installed in the water storage tank 15 can be adjusted. The suction force of F can be adjusted.

  In addition, according to the said 2nd Embodiment, although the water storage tank was suspended in the groundwater in a surrounding wall, you may fix a water storage tank in the predetermined position in a surrounding wall.

It is sectional drawing which shows the contaminated groundwater removal apparatus of the 1st Embodiment of this invention. It is sectional drawing which shows the contaminated groundwater removal apparatus of the 2nd Embodiment of this invention. It is sectional drawing which shows the conventional contaminated groundwater removal apparatus.

Explanation of symbols

10,10 'Contaminated groundwater removal device 11 Ground 11a Above ground 11c Impermeable layer 12 Vertical hole 13 Peripheral wall (side wall)
DESCRIPTION OF SYMBOLS 15 Water storage tank 15a Opening part 15b Bottom part 16 Cover body 20 Water collecting pipe 20a Small hole 21 Connection pipe 21a One end 22 Pump 23 Pumping pipe 25,26 Water level sensor D Ground water d Ground water level E Contaminated area F Contaminated ground water f Contaminated ground water level S water head difference

Claims (5)

In the contaminated groundwater removal device that collects contaminated groundwater in the ground in one place and sucks it up with the pump and pumping pipe to remove it,
A water tank is buried in the ground, and a water collecting pipe having a plurality of small holes is buried in a contaminated area in the ground below the water tank, and the water collecting pipe and the water tank are connected by a connecting pipe. In this water tank, the contaminated groundwater can be stored freely by a head difference with the groundwater level in the ground, and the contaminated groundwater stored in the water tank is transferred to the ground via a pumping pipe. A contaminated groundwater removal apparatus characterized by a pump for sucking up and removing. The contaminated groundwater removal apparatus according to claim 1,
An opening is formed on the upper surface side of the water tank, one end of the connecting pipe is connected to the bottom surface of the water tank, and the opening of the water tank is sealed with a lid. Contaminated groundwater removal equipment. In the contaminated groundwater removal device that collects contaminated groundwater in the ground in one place and sucks it up with the pump and pumping pipe to remove it,
A vertical hole is excavated in the ground, a water storage tank is disposed in the vertical hole, and a water collecting pipe having a plurality of small holes is buried in a contaminated region in the ground from the side wall of the vertical hole. The storage tank is connected by a connecting pipe, and the contaminated groundwater can be stored freely in the water tank due to a head difference with the groundwater level in the ground, and the contamination stored in the water tank is stored in the water tank. A contaminated groundwater removing apparatus, wherein a pump for sucking and removing groundwater through the pumping pipe to the ground is disposed. The contaminated groundwater removal apparatus according to claim 3,
An opening is formed on the upper surface side of the water tank, one end of the connecting pipe is connected to the bottom surface of the water tank, and the opening of the water tank is sealed with a lid. Contaminated groundwater removal equipment. The contaminated groundwater removal apparatus according to claim 3,
The vertical hole is excavated to the impermeable layer, the water tank is suspended in the ground water in the vertical hole, and the level of contaminated groundwater in the water tank is set in the vertical hole and in the water tank. A polluted groundwater removing apparatus, characterized in that a water level sensor is provided for controlling the amount of the contaminated groundwater stored so as to be lower than the water level.

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