JP2009220090A - Cleaning method of underground oil contaminated soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning method of underground oil contaminated soil capable of efficiently cleaning the underground oil contaminated soil. <P>SOLUTION: In the cleaning method of underground oil contaminated soil, a perforated pipe 12 having penetrating pores striding between the inner circumferential surface and the outer circumferential surface of a pipe is installed in an underground oil-contaminated part 2 or in the neighborhood of the oil-contaminated part 2, oil of the oil-contaminated part 2 is sucked via the inside of the perforated pipe 12 while installing an oil adsorption material 15 in the perforated pipe 12, thereby, the oil is adsorbed by the oil adsorption material 15 and, thereafter, the oil adsorption material 15 which adsorbs the oil is taken out onto the ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method capable of efficiently purifying underground oil-contaminated soil.

Conventionally, a method for purifying underground oil-contaminated soil by supplying microorganisms that decompose oil to underground oil-contaminated soil has been proposed (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 9-276837 JP-A-9-276840

However, the above purification method has a problem that when oil is diffused in the ground, the oil cannot be efficiently removed, and the ground oil-contaminated soil cannot be efficiently purified.
This invention is made | formed in view of the said subject, and provides the purification | cleaning method of underground oil-contaminated soil which can purify underground oil-contaminated soil efficiently.

In the method for purifying underground oil-contaminated soil of the present invention, a perforated pipe having a hole penetrating the inner peripheral surface and the outer peripheral surface of the pipe is installed in the vicinity of the underground oil-contaminated part or oil-contaminated part, With the oil adsorbent installed in the perforated tube, the oil adsorbed by adsorbing the oil to the oil adsorbent by sucking the oil in the oil contaminated part via the perforated tube, and then taking out the oil adsorbent adsorbing the oil to the ground It is characterized by that.
It is also characterized in that the oil adsorbing material is covered with a covering material formed of a porous material.
It is also characterized in that the microorganisms are supplied into the perforated tube after the oil adsorbing material that has adsorbed oil is taken out from the perforated tube to the ground.
After the oil adsorbent that has adsorbed oil is taken out from the inside of the perforated pipe, an inner perforated pipe is provided inside the perforated pipe so as to be movable along the axis of the perforated pipe. A packer is provided on the outer peripheral surface of the section, and the outer perforated surface of the inner perforated tube and the inner peripheral surface of the outer perforated tube are expanded by inflating the packer with the inner perforated tube stopped at an arbitrary position in the outer perforated tube. It is also characterized in that the microorganism is supplied into the outer perforated tube via the inner perforated tube after the gap is closed with a packer.

According to the method for purifying underground oil-contaminated soil of the present invention, an oil adsorbent is installed in a perforated pipe installed in the vicinity of an oil-contaminated part or an oil-contaminated part, and the oil in the oil-contaminated part is sucked through the perforated pipe. As a result, even when the oil in the oil-contaminated part is diffused, the oil in the oil-contaminated part can be concentrated on the oil adsorbent, so that the oil in the oil-contaminated part can be removed efficiently, and the oil-contaminated soil in the ground Can be purified efficiently.
Since the oil adsorbing material is covered with the covering material, damage to the oil adsorbing material can be prevented.
After the oil adsorbing material that has adsorbed the oil is taken out from the perforated pipe to the ground and then the microorganisms are supplied into the perforated pipe, the oil is decomposed by the microorganisms, so that more oil in the oil-contaminated part can be removed.
The inside perforated pipe can arbitrarily determine the location of microorganism supply into the perforated pipe, so that microorganisms can be supplied to any position in the perforated pipe in the same way, and the oil in the oil contaminated area around the perforated pipe In addition, it is possible to intensively remove the oil in the oil-contaminated part that is heavily contaminated around the perforated pipe by specifying the microorganism supply point in the perforated pipe.

Best form 1
1 and 2 show the best mode 1 of the present invention, FIG. 1 shows a purification device for underground oil-contaminated soil, and FIG. 2 shows a perforated pipe having an oil adsorbing section in section.

  As shown in FIG. 1, the soil oil-contaminated soil purification apparatus 1 includes an oil-contaminated part 2 or oil contaminated with oil such as A heavy oil or machine oil in the underground 8 under a building 7 such as a machine factory. A perforated tube 12 installed in the vicinity of the contaminated part 2 (hereinafter, the position of the oil contaminated part 2 or the vicinity of the oil contaminated part 2 is referred to as a target installation position), the oil adsorbing part 3, the suction device 4, A microorganism culture device 5 and a connecting tube 6 that connects the perforated tube 12 to the suction device 4 and the microorganism culture device 5 are provided.

  As shown in FIG. 2, the perforated tube 12 includes a plurality of holes 11 that penetrate through the inner and outer peripheral surfaces of the tube. The oil adsorbing unit 3 is installed inside the perforated pipe 12 so as to cover the hole 11 of the perforated pipe 12 installed at the target installation position from the inside of the perforated pipe 12.

  The oil adsorbing part 3 is provided at both ends of a cylinder of the oil adsorbing body 17 and an oil adsorbing body 17 formed in a cylindrical shape by storing the oil adsorbing material 15 in, for example, a cylindrical bag 16 as a covering material. End holding plates 18; 19 and a recovery wire 20 as an oil adsorbent recovery tool are provided. Then, an oil adsorber pushing rod-like pipe 9 for pushing the oil adsorber 17 to a target installation position of the oil contaminated portion 2 through a lateral hole 21 described later is used.

  As the oil adsorbing material 15, a lipophilic and hydrophobic material may be used, and for example, a tomatsu fiber is used. Juniper fiber is a fiber formed by burning wood pine wood chips at 200 ° C to 500 ° C. As the cylindrical bag 16, for example, a cylindrical bag formed of a porous material such as a nonwoven fabric and having one end closed and the other end opened is used. After the pine fiber is filled and stored in the cylindrical bag 16 from the other end opening of the cylindrical bag 16, the other end opening of the cylindrical bag 16 is closed to form the oil adsorbing body 17. The other end holding plate 19 is provided with a through-hole 31 having a diameter larger than the diameter of the collection wire 20 in the center for passing the collection wire 20.

  An example of how to make the oil adsorbing part 3 is shown below. After one end 24 of the recovery wire 20 having a length X or longer as described later is passed through the through hole 31 of the other end holding plate 19, the one end 24 of the recovery wire 20 is the other end of the oil adsorber 17. Is passed through the oil adsorbing body 17 along the center of the cylinder of the oil adsorbing body 17 toward one end. One end 24 of the recovery wire 20 that protrudes outward from one end of the oil adsorbing body 17 and one end holding plate 18 are connected to each other. The other end of the oil adsorbing body 17 and the other end holding plate 19 are connected to each other. With the above configuration, after the oil adsorber 17 is pushed into the perforated pipe 12 installed in the horizontal hole 21, the oil adsorber pushing rod-shaped pipe 9 is passed through the collection wire 20 from the other end 25 of the collection wire 20. The oil adsorber 17 is pushed against the other end holding plate 19 by pushing one end 22 of the rod 9 for pushing the oil adsorbent against the other end holding plate 19 to push the oil adsorber 17 to the target installation position of the oil contaminated part 2. It can be installed at 2 target installation positions. In addition, the oil adsorber 17 that has pulled the other end 25 side of the recovery wire 20 and adsorbed the oil in the oil contaminated portion 2 can be pulled up from the perforated pipe 12 to the ground. In this case, since the oil adsorber 17, the end holding plate 18; 19 and the recovery wire 20 are connected, the oil adsorber 17 can be recovered so that the oil adsorber 17 does not remain inside the perforated tube 12. . Further, since the oil adsorbent 17 is formed by accommodating the oil adsorbent 15 in the cylindrical bag 16 formed of a porous material such as a nonwoven fabric, the oil adsorber 17 is the target in the perforated tube 12. The cylindrical bag 16 prevents the oil adsorbent 15 from being damaged when the oil adsorber 17 is pulled out from the perforated pipe 12 when installed at the installation position, and the oil in the oil-contaminated part 2 is cylindrical. It passes through the bag 16 and is adsorbed on the oil adsorbent 15.

  The connecting pipe 6 is a pipe integral with the perforated pipe 12 or a non-porous pipe whose one end is connected to the other end of the perforated pipe 12 (a hole penetrating the inner and outer peripheral surfaces of the pipe is formed. Tube). One end 26 of the perforated tube 12 is closed. As the recovery wire 20, the oil adsorbent pushing rod-like pipe 9, and the connecting pipe 6, those having a length X (not shown) or more from the target installation position to reach the ground via the horizontal hole 21 are used. Thus, when the perforated pipe 12 or the oil adsorbing body 17 is installed at the target installation position, the other end 27 of the rod 9 for pushing the oil adsorbing body, the other end 28 of the connecting pipe 6, and the other end 25 of the recovery wire 20. Emerges from the start end 30 of the lateral hole 21 to the ground. After the oil adsorber pushing rod-shaped pipe 9 is drawn out and removed, the other end 28 of the connection pipe 6 and the suction port 23 of the suction apparatus 4 are connected to each other, and the suction apparatus 4 is connected to the connection pipe 6 and By sucking the oil in the oil-contaminated part 2 located outside the perforated pipe 12 through the oil adsorber 17 together with the groundwater, the groundwater is sucked by the suction device 4 and the oil is adsorbed by the oil adsorbent 15. Become.

  A method for installing the perforated pipe 12 at the target installation position will be described. First, a boring survey is performed using a boring device (not shown) provided with a sampling tube at the tip, and the position of the oil-contaminated portion 2 in the ground 8 under the building 7 is confirmed. And the horizontal hole 21 which passes a target installation position using the free curve excavator outside a figure is formed. A free-curved excavator is a steel hollow rod that can be bent, a drilling bit provided at the tip of the rod, a position detection sensor provided at the tip of the rod, and a steel hollow rod that moves back and forth. And a driving device. The excavation bit has an elliptical surface such that one end of the cylindrical body is cut off obliquely at the tip. When excavating in a straight line, the rod is rotated and the excavation bit advances while cutting the earth and sand. When excavating in a curved line, the rotation of the rod is stopped and the excavation bit is pressed against the earth and sand, so that the excavation bit receives a reaction force from the natural ground and propels it into a curved line. After forming the horizontal hole 21 that passes through the target installation position and penetrates the ground using a free-curved excavator from the excavation start point, the excavation bit that has come out on the ground is replaced with a reamer bit. The other end of the connecting pipe 6 having the perforated pipe 12 and having a length of X or more is attached to the rear part of the reamer bit, and the reamer bit is inserted into the lateral hole 21 from the terminal end of the lateral hole 21 to perforate the inner wall of the lateral hole 21. The reamer bit is returned to the starting end 30 of the lateral hole 21 while cutting with the reamer bit so as to match the diameter of the tube 12. As described above, the perforated pipe 12 is installed at the target installation position in the horizontal hole 21, and the other end 28 of the connecting pipe 6 is drawn out from the start end 30 of the horizontal hole 21 to the ground.

  A method for purifying underground oil-contaminated soil using the purification device 1 will be described. A horizontal hole 21 passing through the target installation position is formed by the free curve excavator. The perforated pipe 12 inserted into the horizontal hole 21 is installed at the target installation position. The oil adsorbing part 3 is inserted into the perforated pipe 12 from the oil adsorber 17 side through the other end 28 of the connecting pipe 6 and installed at the target installation position. After the oil adsorber pushing rod pipe 9 is removed, the other end 28 of the connecting pipe 6 drawn out from the start end 30 of the lateral hole 21 and the suction port 23 of the suction device 4 are connected to each other. When the suction device 4 is driven and sucked, the oil in the oil-contaminated part 2 located outside the oil adsorbing body 17 is sucked in the direction of the hole 11 of the perforated pipe 12 together with the ground water, so that the ground water becomes the hole 11 and the oil. The adsorber 17 passes through the connecting pipe 6 and is sucked into the suction device 4, and the oil passes through the hole 11 and the cylindrical bag 16 of the oil adsorber 17 and is adsorbed by the oil adsorbent 15. After the suction operation is completed, the recovery wire 20 is pulled, and the oil adsorbing body 17 is pulled out from the inside of the perforated pipe 12 to the ground and removed from the inside of the perforated pipe 12.

  According to the best mode 1, even when the oil in the oil-contaminated part 2 is diffusing, the oil adsorption in which the oil in the oil-contaminated part 2 is provided inside the perforated pipe 12 by the suction operation by the suction device 4 Since it can be made to adsorb | suck to the material 15 intensively, the oil of the oil pollution part 2 can be removed efficiently, and underground oil-contaminated soil can be purified efficiently. Further, since the oil adsorbing material 15 is covered with the cylindrical bag 16 as the covering material, the oil adsorbing material 15 can be prevented from being damaged.

Best form 2
After the oil adsorbent 17 is pulled out from the perforated tube 12 to the ground, the other end 28 of the connecting tube 6 and the inlet 29 of the microorganism culture device 5 are connected to each other, and the microorganisms cultured in the culture solution in the microorganism culture device 5 And the culture solution together from the microorganism culture apparatus 5 into the perforated tube 12, the microorganisms adhere to the oil remaining around the perforated tube 12 via the holes 11 of the perforated tube 12. Decompose oil. According to the best mode 2, even when the oil that could not be adsorbed by the oil adsorbing material 15 remains around the perforated tube 12, the oil is decomposed by microorganisms. More oil can be removed.

Best form 3
After the method described in the best mode 2 is performed, the time required for the microorganisms to decompose the oil after the microorganisms are supplied into the perforated tube 12 (for example, about one week) passes, and then the oil-contaminated part. The remaining amount of oil 2 is examined by a boring survey. If there is a large amount of remaining oil, a new oil adsorbing portion 3 is provided in the perforated tube 12 as in the best mode 1 and sucked by the suction device 4, and further the best As in Embodiment 2, the oil adsorbing portion 3 is pulled out from the perforated pipe 12 to the ground, and microorganisms are supplied into the perforated pipe 12. In this way, by repeating the suction operation and the microorganism supply operation until the amount of oil in the oil-contaminated portion 2 is below the target value while examining the remaining amount of oil in the oil-contaminated portion 2, It can be purified ideally.

Best form 4
After the oil adsorbent 15 that has adsorbed oil by the method described in the best mode 1 is taken out from the perforated tube 12 to the ground, as shown in FIG. 3, it penetrates across the inner peripheral surface and the outer peripheral surface of the tube. An inner perforated tube 41 having a hole 39 to be moved is provided inside the perforated tube 12 so as to be movable in the direction along the axis of the perforated tube 12, and packers 42 are provided on the outer peripheral surfaces of both end portions of the inner perforated tube 41. The packer 42 is inflated in a state where the inner perforated tube 41 is stopped at an arbitrary position in the perforated tube 12, and the gap between the outer peripheral surface of the inner perforated tube 41 and the inner peripheral surface of the outer perforated tube 12 is provided. Microorganisms are supplied into the perforated tube 12 through the inner perforated tube 41 after being blocked by the packer 42. Note that one end 44 of the inner perforated tube 41 is closed, and the inner perforated tube 41 and the microorganism culture apparatus 5 are connected by a connecting tube 45. The packer 42 is formed in a ring bag shape like a floating ring by an elastic body such as rubber, and takes in a fluid such as water into the bag and swells. Although not shown, the purification method of the best mode 4 uses a fluid supply pipe that supplies fluid to the packer 42 and a fluid supply device that supplies fluid to the fluid supply pipe.

  According to the best mode 4, the ground oil-contaminated soil purification method is as follows. After the oil adsorbent 15 that has adsorbed oil by the method described in the best mode 1 is taken out from the perforated pipe 12 to the ground, the inside of the perforated pipe 12 The inner perforated tube 41 is inserted into the inner perforated tube 41, and the inner perforated tube 41 is stopped at an arbitrary position inside the perforated tube 12. In this state, the fluid supply device and the fluid supply pipe (not shown) supply water into the packer 42 and the packer 42 expands, so that the packer 42 has an outer peripheral surface of the inner perforated tube 41 and an inner peripheral surface of the perforated tube 12. Block between. The other end of the connecting tube 45 and the injection port 29 of the microorganism culture device 5 are connected to each other, and the microorganism cultured in the culture solution in the microorganism culture device 5 and the culture solution together from the microorganism culture device 5 have an inner hole. The microbe is supplied into the pipe 41, whereby microorganisms adhere to the oil remaining around the perforated pipe 12 via the hole 39 of the inner perforated pipe 41 and the hole 11 of the perforated pipe 12 and decompose the oil. .

  According to the best mode 4, since the inner perforated tube 41 is used inside the perforated tube 12, the microorganism supply location into the perforated tube 12 can be arbitrarily determined. Accordingly, since microorganisms can be supplied to any position in the perforated pipe 12 in the same manner, the oil in the oil-contaminated part 2 around the perforated pipe 12 can be removed evenly, and the oil into the perforated pipe 12 can be removed. By specifying the microorganism supply location, the oil in the oil-contaminated part 2 that is heavily contaminated with oil around the perforated pipe 12 can be intensively removed.

  The horizontal hole 21 may be a hole that can be dug in the ground. In this case, for example, the ground is excavated with a cutting bit provided at the tip of the drive shaft to form the horizontal hole 21, and the drive shaft and the cutting bit are separated in the middle to leave the cutting bit in the drive shaft. Then, the perforated tube 12 may be inserted into the lateral hole 21 and installed.

The schematic block diagram which shows the purification apparatus (best form 1). Sectional drawing which shows the perforated pipe | tube provided with the oil adsorption | suction part (best form 1). Sectional drawing which shows the perforated pipe provided with the inner perforated pipe (best form 4).

Explanation of symbols

1 purification device, 2 oil contamination section, 3 oil adsorption section, 4 suction device,
5 Microbe culture equipment, 11 holes, 12 perforated tubes, 15 oil adsorbent,
16 Cylindrical bag (coating material), 41 inner perforated tube, 42 packer.

Claims (4)

  In a state where a perforated pipe with a hole penetrating the inner peripheral surface and the outer peripheral surface of the pipe is installed near the oil-contaminated part in the ground or in the vicinity of the oil-contaminated part, and an oil adsorbent is installed in the perforated pipe A method for purifying soil contaminated with underground oil, wherein the oil adsorbent adsorbed on the oil adsorbent by sucking the oil in the oil contaminated portion through the perforated pipe and then taken out to the ground. .   The method for purifying underground oil-contaminated soil according to claim 1, wherein the oil adsorbing material is covered with a covering material formed of a porous material.   The method for purifying underground oil-contaminated soil according to claim 1 or 2, wherein microorganisms are supplied into the perforated pipe after the oil adsorbent adsorbing the oil is taken out from the perforated pipe to the ground.   After the oil adsorbent that has adsorbed oil is taken out from the inside of the perforated pipe, an inner perforated pipe is provided inside the perforated pipe so as to be movable along the axis of the perforated pipe. A packer is provided on the outer peripheral surface of the section, and the outer perforated surface of the inner perforated tube and the inner peripheral surface of the outer perforated tube are expanded by inflating the packer with the inner perforated tube stopped at an arbitrary position in the outer perforated tube. 3. The method for purifying soil oil-contaminated soil according to claim 1 or 2, wherein microorganisms are supplied into the outer perforated pipe via the inner perforated pipe after the space is closed with a packer.

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