JP5153678B2 - Method to reduce oil concentration in oil contaminated part - Google Patents

Description

  The present invention relates to a method capable of efficiently reducing the oil concentration of an oil-contaminated part in the ground.

  Conventionally, a method for purifying underground oil-contaminated soil by supplying microorganisms that decompose oil to an oil-contaminated part of 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, when the oil concentration in the oil-contaminated part is high, for example, when the oil concentration exceeds 1%, there is a problem that microorganisms cannot decompose the oil and the oil concentration in the oil-contaminated part cannot be lowered.
This invention is made | formed in view of the said subject, and provides the method of reducing the oil concentration of an oil-contaminated part efficiently.

According to the method of reducing the oil concentration in the oil-contaminated part according to the present invention, the preceding hole that forms the preceding hole that has passed through the oil-contaminated part in the ground by using the curved boring device having the excavation bit at the tip of the cylindrical rod. After removing the drilling bit at the tip of the rod drawn to the ground from the exit of the preceding hole and attaching a diameter expansion drilling device having a drilling diameter larger than the diameter of the preceding hole at the tip of the rod, While expanding, the diameter-expanding drilling device is drilled and advanced from the outlet of the preceding hole to the inlet of the preceding hole via the leading hole, and the diameter is expanded when the expanding drilling device passes through the oil-contaminated part while excavating and stirring. a surfactant supply step of supplying a surfactant to the oil pollution section through the drilling apparatus, the emulsion to form an emulsion by the stirring of the feed and the oil pollution of the surface active agent to oil pollution unit generating step When the emulsion suction step for sucking up ground the generated emulsion using a suction device, because with a, it is possible to produce a stable emulsion by the supply and the agitation of the surfactant, the oil component of the oil pollution section more Faster and more can be removed. Moreover, since the oil-contaminated part can be stirred using the preceding hole, the oil-contaminated part can be reliably stirred.
Further, in the surfactant supply step, a diameter expansion excavator capable of expanding the excavation diameter of the excavation part is used as the diameter expansion excavation apparatus, and when the diameter expansion excavation apparatus passes through the oil-contaminated part, Since the oil-contaminated part was excavated and agitated by increasing the excavation diameter, the range in which the emulsion was generated can be increased by expanding the excavation and agitation range, so the oil concentration in the oil-contaminated part can be reduced more efficiently. . Furthermore, since the diameter of the diameter-expansion hole other than the oil-contaminated part by the diameter-expanding excavator can be reduced, excavation work becomes easy and economical, and the collapse of the ground can be reduced.
Further, in the surfactant supply step, the pipe having the through hole penetrating the inside and outside of the pipe by installing the pipe in the leading hole by bringing the pipe to the rear end of the diameter expanding excavator is used as the oil contaminated portion. In the emulsion suction step, an inner tube having a packer device at the tip is inserted into the tube and the packer device is operated at the position of the oil contaminated portion to form a closed both-end space communicating with the oil contaminated portion. Since the emulsion is sucked to the ground by connecting the end portion of the inner pipe to a suction device and sucking the closed space at both ends, it is possible to easily attach the suction pipe.
In addition, after confirming that the oil concentration in the oil-contaminated part is 1% or less, the end of the inner tube is connected to a microorganism culture device, and the packer device is operated at the position of the oil-contaminated part. forming a between both ends closed space in communication with the part, since the fed microbial oil contaminated portion via across closed space from a microorganism culture device, a tube used for absorption cited can be used for microbial feed, thereby simplifying the work .

The figure which shows the procedure of the method of reducing the oil density | concentration of an oil-contaminated part (form 1). The figure which shows the procedure of the method of reducing the oil density | concentration of an oil-contaminated part (form 1). (A) is sectional drawing of a reamer apparatus, (b) is a side view of a reamer apparatus, (c) is a front view of a reamer apparatus (form 1). (A) is sectional drawing which shows before diameter expansion of a reamer apparatus, (b) is sectional drawing which shows after diameter expansion of a reamer apparatus (form 2). (A) is a side view before diameter expansion of a reamer apparatus, (b) is a side view (after form 2) which shows after diameter expansion of a reamer apparatus. The figure which shows the procedure of diameter-expansion operation | movement of a reamer apparatus (form 2).

Form 1
1 to 3 show the first embodiment, FIGS. 1 and 2 show the procedure of the method for reducing the oil concentration in the oil-contaminated part, and FIG. 3 shows the reamer device.

  As shown in FIG. 1 and FIG. 2, in the method of the form 1, oil such as A heavy oil and machine oil in the underground of a building such as a machine factory 90 or underground of a waste disposal site. By supplying a surfactant 2 such as a liquid detergent to the oil-contaminated part 1 in the ground contaminated with water and stirring the oil-contaminated part 1, the oil is dispersed in the groundwater and the oil and the groundwater are mixed. The oil concentration in the oil-contaminated part 1 is lowered by sucking the emulsion and confirming that the oil concentration in the oil-contaminated part 1 is 1% or less. Since the microorganisms supplied to the oil-contaminated part 1 decompose the oil remaining in the oil-contaminated part 1, the oil concentration of the oil-contaminated part 1 is further reduced and the oil-contaminated part 1 is purified. become. In the figure, 34 indicates the groundwater level, 37 indicates the unsaturated zone, and 38 indicates the saturated zone.

  The processing device 3 for reducing the oil concentration in the oil-contaminated part 1 includes a curved boring device 4, a drilling fluid supply device 5, a drilling fluid supply pipe 6, a reamer device as a diameter expanding drilling device 7, and a surface activity. The agent supply device 8, the surfactant supply tube 9, the tube 10, the suction device 11, and the microorganism culture device 12 are provided. The drilling fluid supply device 5, the surfactant supply device 8, the suction device 11, and the microorganism culture device 12 are installed on the ground.

An example of the reamer device 7 will be described with reference to FIG. The reamer device 7 includes a reamer 13, a liquid intake pipe 14, a liquid storage unit 15, a pipe connecting member 16, a joint member 17, and a swivel joint 18.
The reamer 13 includes a bell-shaped reamer body 20 and an excavating blade portion 21 provided so as to protrude from the outer surface of the reamer body 20. The excavation blade portion 21 is provided in a spiral shape with a central axis of the reamer device 7 described later as a center. The concave grooves 22 formed between the excavating blade portions 21 function as discharge grooves that guide the excavated soil backward. A top through hole 24 is formed in the apex portion 23 of the bell that forms the reamer body 20. A partition member 26 that partitions the inside of the bell into the apex side and the lower end opening 25 side is provided on the inner side near the lower end opening 25 of the bell.
One end of the liquid intake tube 14 is connected to the partition member 26, and the other end of the liquid intake tube 14 passes through the top through hole 24 of the reamer body and protrudes outside the reamer body 20. The other end of the liquid intake tube 14 is connected to the tip of a rod 52 described later. The liquid intake pipe 14 is provided such that the central axis thereof coincides with the central axis of the reamer device 7 that passes through the apex of the bell and the center of the partition member 26. The space between the outer periphery of the liquid intake tube 14 and the top through-hole 24 and the space between the outer edge of the partition member 26 and the inner peripheral surface 27 of the reamer body 20 are formed in a sealed state. Thereby, a space serving as the liquid storage portion 15 is formed between the partition member 26, the inner peripheral surface 27 of the reamer body 20, and the outer peripheral surface 28 of the liquid intake pipe 14.
The liquid intake pipe 14 positioned in the liquid storage portion 15 is formed with a pipe through hole 30 penetrating the inner peripheral surface and the outer peripheral surface of the pipe. A reamer through hole 31 is formed in the reamer main body 20 in contact with the liquid storage unit 15 so as to penetrate the inner peripheral surface 27 and the outer peripheral surface 29 of the reamer main body 20. The partition member 26 is formed with a partition portion through hole 32 that penetrates the outside of the protective cylinder 40 described later and the liquid storage portion 15. Therefore, the drilling fluid 19 and the surfactant 2 stored in the liquid storage unit 15 through the rod 52, the liquid intake pipe 14, and the pipe through hole 30 are reamed through the reamer through hole 31 and the partitioning unit through hole 32. 20 is discharged to the outside.
The tip of the tube 10 is connected to the tube connecting portion 35 of the tube connecting member 16. The reamer 13 side of the pipe connecting member 16 is connected to the back surface 36 of the partition member 26 via the joint member 17 and the swivel joint 18. A protection cylinder 40 that houses the joint member 17 and the swivel joint 18 in the cylinder and protects them is connected to the back surface 36 of the partition member 26.
The swivel joint 18 includes a rotation side member 41 and a non-rotation side member 42, the rotation side member 41 is connected to the back surface 36 of the partition member 26, and the non-rotation side member 42 is interposed via the joint member 17 and the pipe connection member 16. As a result, when the reamer 13 receives the rotational force of the rod 52, only the reamer 13 rotates and excavates the ground with the excavating blade 54, and the tube 10 does not rotate.
The joint member 17 connects the pipe connecting member 16 and the swivel joint 18 so that the reamer 13 and the pipe 10 can swing with respect to each other in a direction orthogonal to the paper surface of FIG. It is provided with the structure which was made.

Next, a method for reducing the oil concentration of the oil contaminated part 1 using the processing device 3 will be specifically described.
The position of the oil contaminating part 1 to be purified is confirmed by conducting a boring survey in advance.
Then, as shown in FIG. 1 (a); FIG. 1 (b), the leading hole 51 is formed by using the curved boring device 4 in which the excavation bit 50 (excavation blade) is attached to the tip of the cylindrical rod 52. . The diameter (excavation diameter) of the excavation bit 50 is about 45 mm, for example, and the outer diameter of the rod 52 is smaller than the diameter of the excavation bit 50. The excavation bit 50 has a tip portion formed in a diagonal cut surface.
When the leading hole 51 is formed, first, after excavating the ground in the diagonally downward direction by propelling the excavating bit 50 to the depth position of the oil-contaminated portion 1, the excavating bit 50 is moved in the horizontal direction. The ground is excavated in the horizontal direction so as to be propelled to form a leading hole 51 that passes through the oil-contaminated portion 1, and then the ground is excavated in the diagonally upward direction so that the excavation bit 50 is propelled upward. The excavation bit 50 is put out on the ground.
When excavating the ground obliquely, the excavation bit 50 is propelled while rotating the excavation bit 50 by rotating the rod 52 with a drive source such as a motor about the central axis of the rod 52 as a rotation center.
When changing the propulsion direction of the excavation bit 50, the rod 52 is not rotated, but a thrust force is applied to the rod by a pressing device such as a hydraulic cylinder so that earth pressure acts on the oblique cutting surface of the excavation bit. The propulsion direction of the excavation bit 50 is changed.
At the time of excavation, the tip of the drilling fluid supply pipe 6 such as a hose passed through the cylinder of the rod 52 is fixed to the drilling bit 50 so as not to rotate, and the drilling fluid supply pipe drawn out from the rear end of the rod 52. The rear end of 6 is connected to the drilling fluid supply device 5, the rod 52 is rotated, and the drilling fluid 19 is pumped and supplied from the drilling fluid supply device 5 to the drilling bit 50 through the drilling fluid supply pipe 6. As the drilling liquid 19, water, mud water, bentonite or the like is used. Thereby, the excavation bit 50 excavates the ground while the excavation liquid 19 is jetted from the excavation liquid injection hole 39 of the excavation bit 50 to the ground. The tip of the surfactant supply pipe 9 such as a hose passed through the cylinder of the rod 52 is fixed to the excavation bit 50 so as not to rotate, and the rear end of the surfactant supply pipe 9 is connected to the rear end of the rod 52. Pull it out. Then, as the excavation progresses, the rod 52, the drilling fluid supply pipe 6, and the surfactant supply pipe 9 are added to the rear ends of the rod 52, the drilling fluid supply pipe 6, and the surfactant supply pipe 9, respectively. By repeating, the preceding hole 51 that passes through the oil contaminated portion 1 is formed.

After forming the preceding hole 51 that has passed through the underground oil contaminated portion 1 using the curved boring device 4, the excavation bit 50 attached to the tip of the rod 52 drawn to the ground from the outlet 56 of the preceding hole 51 is removed. Instead, the front end (the other end of the liquid intake pipe 14) of the reamer device 7 whose outer diameter (excavation diameter) is larger than the diameter of the preceding hole 51 is attached to the tip of the rod 52. The tip of the tube 10 is attached to the rear end (tube connecting portion 35) (see FIG. 1C). Further, the tip of the drilling fluid supply pipe 6 and the tip of the surfactant supply pipe 9 are attached to the liquid intake pipe 14 of the reamer device 7. The reamer device 7 is excavated and advanced from the outlet 56 of the preceding hole 51 through the preceding hole 51 toward the inlet 57 of the preceding hole 51 while rotating the rod 52, thereby expanding the diameter of the preceding hole 51. The tube 10 is drawn into the radial hole 58. As the reamer device 7 passes through the preceding hole 51 and advances for excavation, the operation of newly adding the pipe 10 to the rear end of the pipe 10 is repeated, so that the outlet 56 from the leading hole 51 to the inlet 57 is repeated. A diameter expansion hole 58 is formed so as to straddle, and the tube 10 is drawn into the diameter expansion hole 58 and embedded (see FIG. 2B). In this case, only the tube 10 located in the oil-contaminated part 1 is used as the perforated tube 10x, and the tube 10 located in the other part uses the non-porous tube 10y. The perforated tube 10x is a tube provided with a plurality of through holes 61 penetrating across the inner and outer peripheral surfaces of the tube. In this case, the distance x from the inlet 57 of the preceding hole 51 to the oil contaminated portion 1 is examined in advance, and the non-porous pipe 10y is added until the reamer device 7 advances by the distance x from the outlet of the preceding hole 51, Thereafter, the perforated tube 10x can be installed only in the oil-contaminated portion 1 by adding the perforated tube 10x within the range of the oil-contaminated portion.
When the reamer device 7 excavates a portion other than the oil contaminated portion 1, the drilling fluid 19 is supplied to the liquid storage portion 15 of the reamer device 7 through the drilling fluid supply pipe 6, so that the drilling fluid 19 is reamed. It is discharged into the ground through the through hole 31 and the partitioning part through hole 32.

  When the reamer device 7 excavates and stirs the oil contaminated portion 1, the rear end of the surfactant supply pipe 9 is connected to the surfactant supply apparatus 8, and the surfactant supply apparatus 8 passes through the surfactant supply pipe 9. Then, the surfactant 2 is pumped and supplied to the liquid storage part 15 of the reamer device 7, whereby the surfactant 2 is discharged into the ground through the reamer through hole 31 and the partition part through hole 32 (FIG. 2 (a )reference). By this stirring and the surfactant 2, the oil in the oil-contaminated part 1 is dispersed to form a stable emulsion in which the oil and groundwater are mixed.

  And after the pipe | tube 10 is embed | buried in the diameter-expansion hole 58 ranging from the exit 56 of the preceding hole 51 to the inlet 57, the oil content of the oil-contaminated part 1 can be removed more quickly by attracting | sucking the said emulsion. That is, the oil content of the oil-contaminated part 1 can be effectively removed, and the oil concentration of the oil-contaminated part 1 can be efficiently reduced.

  For the suction operation, an inner tube 63 (see FIG. 2B) having a known packer device 60 at the tip is prepared, and this inner tube 63 is inserted into the tube 10 from the packer device 60 side. By operating the packer device 60 after the device 60 reaches the perforated pipe 10x at the position of the oil-contaminated part 1, the oil-contaminated part 1 and the perforated pipe 10x are connected to the oil-contaminated part 1 through the through-hole 61 of the perforated pipe 10x. A closed both-end space 62 that communicates is formed, the end of the inner tube 63 is connected to a suction device 11 such as a suction pump, and the both-end closed space 62 is sucked, whereby the emulsion is passed through the through-hole 61 and the both ends of the perforated tube 10x. It can be sucked to the ground via the closed space 62 and the inner pipe 63.

  The above-described suction operation is repeated, and the oil concentration of the sucked emulsion is inspected. If the oil concentration is 1% or less, the oil concentration in the oil-contaminated part 1 is assumed to be 1% or less. ), The end of the inner tube 63 is connected to the microorganism culture device 12, and the packer device 60 of the inner tube 63 is operated in the same manner as the suction operation to supply microorganisms to the oil contaminated portion 1.

According to the first aspect, the supply of the surfactant 2 to the oil-contaminated part 1 and the stirring of the oil-contaminated part 1 disperse the oil in the oil-contaminated part 1 and form a stable emulsion in which the oil and groundwater are mixed. As a result, the oil content of the oil contaminated portion 1 can be removed more quickly and more. In other words, the oil content of the oil-contaminated part 1 can be effectively removed, and the oil concentration of the oil-contaminated part 1 can be effectively lowered until the concentration reaches 1% or less at which microorganisms can decompose the oil. The removal work can be speeded up.
Further, since the microorganisms are supplied to the oil-contaminated part 1 after the concentration of the oil in the oil-contaminated part 1 reaches a concentration at which the microorganisms can decompose the oil, the microorganisms can fully exhibit the oil-decomposing ability. 1 can be quickly purified.
Further, since the oil contaminated part 1 is stirred by the reamer device 7 using the leading hole 51, the oil contaminated part 1 can be reliably stirred and a stable emulsion is generated.
Further, since the perforated tube 10x is installed in the leading hole 51 by bringing the tube 10 to the rear end of the reamer device 7, the work of attaching the suction tube can be facilitated.
Further, since the perforated tube 10x used for suction is used for supplying microorganisms, the operation can be simplified.

Form 2
When the reamer device 7 passes through the oil contaminated portion 1, the outer diameter (excavated diameter) of the reamer 13 (excavated portion) of the reamer device 7 is increased and the oil contaminated portion 1 is excavated and stirred. For example, the excavation blade 65 (see FIG. 4) provided separately from the spiral excavation blade portion 21 of the reamer device 7 or a part 66 (see FIG. 5) of the spiral excavation blade 54 of the reamer device 7 As shown in FIG. 6, when the reamer device 7 reaches the oil-contaminated portion 1 using the reamer device 70 formed so as to be able to advance and retract in the radial direction of the reamer body 20, a part of the digging blade 65 or the digging blade 54. When the reamer device 7 passes through the oil-contaminated part 1 by projecting 66 to the outside of the reamer body 20 and the reamer device 7 passes through the oil contaminated portion 1, the digging blade 65 or a part 66 of the digging blade 54 is moved to the reamer body 20. The outer diameter of the reamer 13 is restored to the original. For example, when the original outer diameter of the reamer 13 is 400 mm, the reamer 13 is formed so that the outer diameter is 500 mm to 750 mm. The mechanism for moving the excavation blade 65 or the part 66 of the excavation blade 54 forward and backward is formed by, for example, a mechanism using a spring, a mechanism using a hydraulic cylinder or a hydraulic cylinder.
According to the above, by supplying the surfactant 2 by pressure to the reamer device 7 while the outer diameter of the reamer 13 is expanding, the surfactant 2 fed by pressure is supplied to the reamer through hole 31 and the partitioning portion. While being discharged into the ground through the through-hole 32, the oil contaminated part 1 is agitated by the rotation of the reamer device 7.
According to the second aspect, since the stirring range in the oil-contaminated part 1 can be increased, the surfactant 2 can be dispersed in a wide range, and a stable emulsion is formed in a wide range of the oil-contaminated part 1, so that the oil content of the oil-contaminated part 1 Can be removed faster and more, and the oil concentration in the oil contaminated part 1 can be effectively reduced. In addition, since the diameter of the diameter-enlarged hole 58 other than the oil-contaminated part 1 by the reamer device 7 can be reduced, excavation work becomes easy and economical, and the collapse of the ground can be reduced.

Form 3
If the enlarged diameter holes 58 are formed so as to have a lattice shape when viewed from above with respect to the oil-contaminated portion 1, for example, the oil concentration of the oil-contaminated portion 1 over a wide range can be effectively reduced.

Form 4
A hole that reaches the oil-contaminated part 1 is formed by excavating the ground, and an emulsion is generated by feeding the surfactant 2 into the oil-contaminated part through the hole, and the emulsion may be sucked. .

Form 5
In Form 4, the surfactant 2 is fed into the oil-contaminated part 1 while stirring the oil-contaminated part 1 with a stirring machine, or the surfactant 2 is added to the oil-contaminated part 1 without stirring the oil-contaminated part 1 with a stirring machine. If the stirring effect is imparted to the oil-contaminated part 1 by feeding at a high pressure, the emulsion becomes stable, which is preferable.

The perforated tube 10x may be used as the tube 10 embedded in the expanded hole 58. In this case, the emulsion may be sucked through the perforated tube 10x while the oil-contaminated part 1 is excavated and stirred by the reamer device 7 and the surfactant 2 is supplied to the oil-contaminated part 1.
In Embodiment 1, an example in which microorganisms are supplied to the oil-contaminated part 1 after confirming that the oil concentration in the oil-contaminated part 1 has become 1% or less has been described.

1 Oil contaminated part 2 Surfactant 4 Curve boring device 9 Expanding drilling device,
10 pipes, 50 drill bits, 51 leading holes, 52 rods, 56 outlets, 57 inlets.

Claims (4)

A preceding hole forming step of forming a preceding hole that has passed through an oil-contaminated portion in the ground using a curved boring device having a drilling bit at the tip of a cylindrical rod ;
Remove the excavation bit at the tip of the rod drawn out from the outlet of the preceding hole and attach an enlarged drilling device with a larger excavation diameter than the diameter of the preceding hole to the tip of the rod, then expand the diameter while rotating the rod When the drilling device passes through the oil-contaminated part while excavating and stirring the drilling device from the outlet of the preceding hole to the inlet of the preceding hole via the leading hole, the diameter expanding drilling device passes through the drilling device. a surfactant supply step of supplying a surfactant to the oil pollution unit,
An emulsion producing step for producing an emulsion by supplying a surfactant to the oil-contaminated part and stirring the oil-contaminated part ;
An emulsion suction step of sucking the produced emulsion to the ground using a suction device ;
Method of reducing the oil concentration of the oil pollution unit for comprising the. In the surfactant supply step, using a diameter capable enlarged rig drilling diameter of the drilling unit as the diameter drilling device, drilling drilling unit when the diameter drilling device passes through the oil pollution unit The method for reducing the oil concentration in the oil-contaminated part according to claim 1 , wherein the oil-contaminated part is excavated and stirred by increasing the diameter. In the above surfactant supply step, the pipe is installed in the preceding hole by bringing the pipe to the rear end of the diameter expanding excavator , and the portion having the through hole penetrating into and out of the pipe is positioned in the oil contaminated portion. In the emulsion suction step, an inner tube having a packer device at the tip is inserted into the tube and the packer device is operated at the position of the oil-contaminated portion to form a closed both-end space communicating with the oil-contaminated portion. The oil concentration of the oil-contaminated part according to claim 1 or 2 , wherein the emulsion is sucked to the ground by connecting the end of the inner pipe to a suction device and sucking the closed space at both ends. How to lower. After confirming that the oil concentration in the oil-contaminated part has become 1% or less, the end of the inner tube is connected to a microorganism culture device, and the packer device is operated at the position of the oil-contaminated part. The method for reducing the oil concentration in the oil-contaminated part according to claim 3 , wherein a communicating closed both-end space is formed, and microorganisms are supplied from the microorganism culture apparatus to the oil-contaminated part via the both-end closed space .

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