JP2017142070A - Soil storage tool and soil monitoring method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil storage tool capable of monitoring soil at low cost.SOLUTION: A soil storage tool 1 includes a plurality of unit containers 5 which store soil and which are connected to each other. Each of the unit containers 5 includes: a cylindrical body with through holes; an upper lid body for sealing an upper part of the cylindrical body; and a lower lid body for sealing a lower part of the cylindrical body.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a soil storage device used for monitoring the effect of purification performed on soil contaminated with petroleum organic matter and the like, and a soil monitoring method using such a soil storage device.

  For example, in soil contaminated with petroleum-based organic matter, volatile organic compounds, etc., by performing some stimulation on microorganisms originally present in the soil, the soil itself has a repair ability, that is, contaminated organic matter due to soil microorganisms A method has been proposed in which the ability to decompose is exhibited to reduce pollution and to purify the soil.

Patent Document 1 (Japanese Patent Laid-Open No. 2002-1303), as an example, is characterized by adding sugar and / or artificial humus (compost) to petroleum-contaminated soil in order to purify oil-contaminated soil in a short period of time. An early purification method for oil-contaminated soil is disclosed.
JP 2002-1303 A

  The soil monitoring for confirming the effect of biostimulation (in-situ microbial purification) as shown in Patent Document 1 requires soil sampling by boring a plurality of times, which is costly. There was a problem.

  In addition, there is a problem that the area to be drilled for monitoring is narrow and it is not possible to perform boring at a plurality of locations.

  In order to solve the above problems, a soil container according to the present invention is a soil container in which a plurality of unit containers for storing soil are connected, and the unit container has a cylindrical shape having a through hole. A body, an upper lid for sealing the upper part of the cylindrical body, and a lower lid for sealing the lower part of the cylindrical body.

  In the soil container according to the present invention, the unit container is connected by a connecting member, and a locking member for locking the connecting member is arranged on the upper lid body and the lower lid body. It is characterized by.

  The soil monitoring method according to the present invention includes a storage step of storing the soil in the plurality of unit containers of the soil storage device described above, and the soil storage device in which the soil is stored in the storage step is suspended from a hole. A submerging step of immersing the soil storage device in groundwater, an acquisition step of removing and acquiring the unit container of the soil storage unit submerged in the submersion step, and the unit container acquired in the acquisition step And an analysis step of analyzing the soil.

  Since the soil storage device according to the present invention has a structure in which a plurality of unit containers for storing soil are connected, according to such a soil storage device according to the present invention, one hole is formed by boring. This can be done, and it is possible to control the cost and monitor the soil. Moreover, according to the soil storage device which concerns on this invention, even if a boring target land is narrow, it becomes possible to monitor soil.

  Moreover, according to the soil monitoring method using the soil storage tool which concerns on this invention, it becomes possible to suppress cost and to monitor soil.

It is a figure explaining the unit container 5 which comprises the soil storage tool 1 which concerns on embodiment of this invention. It is a perspective view of the unit container 5 which comprises the soil storage tool 1 which concerns on embodiment of this invention. It is a figure explaining the soil storage auxiliary | assistance tool 60 which fills unit container 5 with oil containing soil etc. S. FIG. It is a perspective view of the soil storage tool 1 which concerns on embodiment of this invention. It is a figure explaining the soil monitoring method using the soil container 1 which concerns on embodiment of this invention. It is a figure explaining the soil monitoring method using the soil container 1 which concerns on embodiment of this invention. It is a figure explaining the unit container 5 which comprises the soil storage tool 1 which concerns on other embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. Drawing 1 is a figure explaining unit container 5 which constitutes soil container 1 concerning the embodiment of the present invention. FIG. 1A is a diagram illustrating a state where the unit container 5 is disassembled, and FIG. 1B is a diagram illustrating a completed state of the unit container 5. FIG. 2 is a perspective view of the unit container 5 constituting the soil container 1 according to the embodiment of the present invention.

  The soil container 1 according to the present invention includes a plurality of unit containers 5. In the plurality of unit containers 5, the collected oil-containing soil S (contaminated soil) is stored as a sample. Moreover, it is assumed that the soil container 1 composed of a plurality of unit containers 5 is used by being suspended deeper than the groundwater level of the observation hole.

  The unit container 5 mainly includes a cylindrical body 10, an upper lid body 20 that covers the upper portion thereof, and a lower lid body 30 that covers the lower portion of the cylindrical body 10. As the material of the cylindrical body 10, the upper lid body 20, and the lower lid body 30, it is preferable to use stainless steel that is not easily affected by oil or water.

  A plurality of through holes 13 are formed in the cylindrical body 10 of the unit container 5. Groundwater penetrates into the oil-containing soil S or the like S stored in the unit container 5 from this perforation. The through-hole 13 has a diameter of about 1 mm in order to prevent the oil-containing soil S or the like, which is a sample, from flowing out or falling, and to make it easy for groundwater to pass through the through-hole 13. Moreover, it is preferable to provide a large number of through-holes 13 perforated in the cylindrical body 10 so that the rigidity of the cylindrical body 10 does not decrease. In addition, materials such as non-woven fabric and paper can be disposed inside and outside the unit container 5 to prevent oil-containing soil S and the like from flowing out.

  Several screwing screw holes 17 are provided along the outer periphery of the tubular body 10 at the upper and lower portions of the tubular body 10. These screwing screw holes 17 are used for fixing the upper lid body 20 and the lower lid body 30 to the cylindrical body 10 with screws 40 and sealing the unit container 5.

  When analyzing oil-containing soil S or the like, the minimum required amount is 200 cc. Therefore, in order to ensure this, the length of the cylindrical body 10 of the unit container 5 is preferably about 20 cm. Moreover, it is preferable that the diameter of the cylindrical body 10 of the unit container 5 shall be about 40 mm in diameter from the relationship with the internal diameter of the observation well which accommodates the soil container 1 which concerns on this invention at the time of monitoring.

  The upper lid body 20 and the lower lid body 30 are provided with a locking member 23 and a locking member 33, respectively. The locking member 23 and the locking member 33 are configured to lock the end portions of the connecting member 50 so that the two unit containers 5 can be connected to each other by the single connecting member 50. As a structural member for locking at both ends of the connecting member 50, for example, an eggplant can be used. Further, as the string-like member constituting the connecting member 50, a corrosive stainless chain or the like may be used.

  Next, a method of filling the unit container 5 configured as described above with oil-containing soil S (contaminated soil) collected as a sample will be described. For such filling of oil-containing soil S or the like, it is preferable to use a soil storage aid 60 described below in order to adjust the sample density corresponding to different ground densities. It can also be filled with S, such as containing soil.

  FIG. 3 is a diagram illustrating a soil storage aid 60 that fills the unit container 5 with oil-containing soil S or the like. The soil storage auxiliary tool 60 includes a mortar member 70 and a heel member 80.

  The mortar member 70 has an accommodation space 73, and a water flow hole 75 is provided so as to communicate with the lower portion of the accommodation space 73.

  A semi-finished product of the unit container 5 in which the lower lid body 30 is attached to the cylindrical body 10 is set in the accommodation space 73. The unit container 5 set in the accommodation space 73 is filled with oil-containing soil S or the like as a sample. In addition, when the oil-containing soil S or the like is tamped from the flowing water hole 75, it is assumed that the water that exudes from the oil-containing soil S or the like flows down.

  The eaves member 80 has a tamping eaves part 81 that abuts and firms directly against the oil-containing soil or the like S, an eaves part 83 extending from the evaporating eaves part 81, and an insertion hole 86 through which the eaves part 83 is inserted. And a rammer unit 85. The rammer part 85 is an iron weight, and the ramming part 81 rams the oil-containing soil etc. S in the unit container 5 by dropping the rammer part 85 and applying an impact to the tamping part 81.

  By adjusting the height of the rammer part 85 to be dropped and the number of drops of the rammer part 85, the density of the oil-containing soil S or the like in the unit container 5 can be adjusted. In the soil monitoring method according to the present invention, a plurality of unit containers 5 are used. Here, it is preferable that the density of the oil-containing soil S or the like filled between the plurality of unit containers 5 is substantially the same. Therefore, when filling the unit container 5 used in the soil container 1 used in the same test site with oil-containing soil S or the like, the height of the rammer part 85 to be dropped and the number of drops of the rammer part 85 are unified. It is preferable to keep it.

  The mortar member 70 is configured to be disassembled by a structure not shown, and when the semi-finished product of the unit container 5 accommodated in the accommodating space 73 cannot be taken out from the accommodating space 73, the mortar member 70 is disassembled and taken out.

  In the soil storage aid 60 as described above, the plurality of unit containers 5 filled with oil-containing soil or the like S are connected by the connecting member 50 as shown in FIG. FIG. 4 is a perspective view of the soil container 1 according to the embodiment of the present invention.

  Next, a method of monitoring the effect using the soil container 1 according to the present invention after the soil purification treatment by biostimulation or the like will be described. 5 and 6 are diagrams for explaining a soil monitoring method using the soil container 1 according to the embodiment of the present invention. FIG. 5 shows a soil monitoring method in the case where the oil-containing soil etc. S contains harmful substances having a lighter specific gravity than water such as benzene, and FIG. 6 shows the volatile organic compounds (VOCs) etc. in the oil-containing soil etc. S. This shows the soil monitoring method when harmful substances with a specific gravity higher than water are included. Hereinafter, a description will be given step by step with reference to FIGS.

  In FIG. 5A and FIG. 6A, a hole H is provided by boring around the soil purification treatment. This hole H is used as an observation well for soil monitoring. The shaded portion in FIG. 5 (A) shows a formation that has been found to contain a lot of oil components by analyzing the soil obtained by boring. In the soil monitoring method according to the present invention, the oil-containing soil S or the like S in this formation is used by filling the unit container 5 in the soil container 1.

  5 (B) and 6 (B) show a state in which a tube T, which is a vinyl chloride tube (VP50) having an inner diameter of 51 mm, is inserted and set in the hole H as described above. This can prevent the observation well from collapsing. In the drilling hole H, for example, it is assumed that the groundwater G springs up to the groundwater level indicated by the alternate long and short dash line.

  FIG. 5C and FIG. 6C show a state in which the soil storage device 1 according to the present invention is suspended in the borehole H in which the groundwater G is springed and immersed in the groundwater G. Here, the plurality of unit containers 5 of the soil container 1 are filled with oil-containing soil S or the like S obtained at the time of boring in FIGS. 5 (A) and 6 (A). In addition, the soil storage device 1 is assumed to be used initially in which six unit containers 5 are connected.

  Here, in FIG. 5 (C), harmful substances (oil content: benzene, etc.) having a lighter specific gravity than water are present in a relatively shallow depth of several meters or less, which is a fluctuation zone of the groundwater level, and oil is contained at this depth. Since the contained soil S or the like is generated, the soil storage device 1 is installed near the lowest groundwater level and deeper than the vicinity of the lowest groundwater level.

  Further, in FIG. 6C, harmful substances (volatile organic compounds: VOCs, etc.) having a specific gravity higher than that of water are present near the base of the aquifer having a relatively deep depth of several tens to several tens of meters. Since oil-containing soil S or the like is generated at this depth, the soil container 1 is installed near the base of the aquifer where soil contamination is observed.

  It is assumed that the groundwater G contains microorganisms that decompose oil and activated as a soil purification treatment. Therefore, it is expected that the oil contained in the oil-containing soil S or the like filled in the unit container 5 is decomposed with the passage of time.

  In the present embodiment, the activation of microorganisms is taken as an example of the soil purification treatment, but the soil purification treatment that can be monitored by the soil monitoring method according to the present invention is not limited to this example.

  5D and 6D, one of the unit containers 5 of the soil container 1 submerged in the groundwater G is removed, and the remaining unit containers 5 are submerged in the groundwater G again. It shows a state. At this time, the oil-containing soil S or the like filled in the removed unit container 5 is taken out and used as a sample for analyzing oil or the like.

  By performing the steps shown in FIG. 5 (D) and FIG. 6 (D) periodically, it is possible to grasp the progress of decomposition of oil in the oil-containing soil S, that is, the progress of soil purification. Become.

  As described above, since the soil container 1 according to the present invention has a structure in which a plurality of unit containers 5 that store soil are connected, according to such a soil container 1 according to the present invention. The drilling by boring only needs to be performed in one place, and the cost can be suppressed and the soil can be monitored. Moreover, according to the soil container 1 which concerns on this invention, even if a boring target land is narrow, it becomes possible to monitor soil.

  Moreover, according to the soil monitoring method using the soil container 1 which concerns on this invention, it becomes possible to suppress cost and to monitor soil.

  Next, another embodiment of the present invention will be described. Since the present embodiment is different from the previous embodiment only in the configuration of the unit container 5, the following description focuses on the differences related to the unit container 5.

  FIG. 7 is a view for explaining a unit container 5 constituting a soil container 1 according to another embodiment of the present invention. FIG. 7A is a diagram illustrating a state in which the unit container 5 is disassembled, and FIG. 7B is a diagram illustrating a completed state of the unit container 5. FIG. 2 is a perspective view of the unit container 5 constituting the soil container 1 according to the embodiment of the present invention.

  In the present embodiment, the lid mounting sleeve member 90 is fixedly attached to each of the upper end portion and the lower end portion of the cylindrical body 10. The lid attaching sleeve member 90 is formed with at least one L-shaped slit 95.

  On the other hand, the upper lid body 20 is formed with an inner fitting cylinder portion 26 having a diameter that can be fitted into the cylindrical body 10, and a protruding portion 27 protruding from the inner fitting cylinder portion 26. Similarly, the lower lid body 30 is formed with an inner fitting cylinder portion 36 having a diameter that can be fitted into the cylindrical body 10, and a protrusion projection portion 37 protruding from the inner fitting cylinder portion 36.

  When the oil-containing soil S or the like is sealed inside the cylindrical body 10, the upper O-ring 29 and the lower O-ring are respectively provided in the inner fitting cylinder portion 26 of the upper lid body 20 and the inner fitting cylinder portion 36 of the lower lid body 30. 39 is attached, and the upper lid 20 is attached to the cylindrical body 10 by movement as indicated by an arrow X, and the lower lid 30 is attached by movement as indicated by an arrow X ′.

  As described above, in the present embodiment, since the upper lid body 20 and the lower lid body 30 of the unit container 5 have a push-and-rotate attachment / detachment mechanism, the attachment / detachment of the lid can be easily performed. ing.

DESCRIPTION OF SYMBOLS 1 ... Soil storage tool 5 ... Unit container 10 ... Cylindrical body 13 ... Through-hole 17 ... Screwing screw hole 20 ... Upper lid body 23 ... Locking member 26 ... -Inner fitting cylinder part 27 ... Projection part 29 ... Upper O-ring 30 ... Lower lid body 33 ... Locking member 36 ... Inner fitting cylinder part 37 ... Projection part 39 ... Lower O-ring 40 ··· Screw 50 ··· Connection member 60 ··· Soil storage aid 70 ··· Mortar member 73 ··· Storage space 75 ··· Flow hole 80 ··· Reed member 81 ··· Clamping collar 83 ... collar 85 ... rammer 86 ... insertion hole 90 ... cover mounting sleeve member 95 ... L-shaped slit H ... drilling hole T ... tube S ... Soil containing oil G ... Groundwater

Claims (3)

A soil storage device in which a plurality of unit containers for storing soil are connected,
The unit container includes a cylindrical body having a through hole, an upper lid body that seals an upper portion of the cylindrical body, and a lower lid body that seals a lower portion of the cylindrical body. Storage tool. The soil according to claim 1, wherein the unit containers are connected by a connecting member, and a locking member for locking the connecting member is disposed on the upper lid body and the lower lid body. Storage tool. A storage step of storing soil in the plurality of unit containers of the soil storage device according to claim 1 or 2,
Suspending the soil storage device in which soil is stored in the storage step in a drilling hole, and immersing the soil storage device in ground water;
An acquisition step of removing and acquiring the unit container of the soil container that has been submerged in the submersion step;
An analysis step of analyzing the soil in the unit container acquired in the acquisition step.

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