JP4919998B2 - Purification method for oil contaminated parts - Google Patents

Description

  The present invention relates to a method for purifying an oil-contaminated part that can efficiently supply microorganisms to an oil-contaminated part in the ground and efficiently purify the oil-contaminated part.

A hole that forms a well by drilling vertically from the ground surface to the oil-contaminated part in the ground and the vicinity of the oil-contaminated part, supplies microorganisms in the hole, and decomposes the oil in the oil-contaminated part to the microorganisms. Conventional techniques for purifying contaminated parts have been proposed (see, for example, Patent Document 1). Moreover, in this prior art, in addition to the microbe supply work, the entire oil-contaminated part in the ground is efficiently purified by performing the aeration work after lowering the groundwater level by performing the pumping work. I am doing so.
JP-A-2005-279415

However, in the above prior art, it is necessary to conduct a boring survey to confirm the position of the underground oil contaminated portion before forming a vertical hole from the ground surface to the underground oil contaminated portion or the vicinity of the oil contaminated portion. As a result, there is a problem that it takes a survey cost to investigate the position of the oil-contaminated part in the ground.
The present invention has been made in view of the above problems, and can reduce the cost of investigating the position of the underground oil-contaminated part and can efficiently supply microorganisms to the underground oil-contaminated part. To provide a method for efficiently purifying oil contaminated parts.

Method of purifying oil pollution unit according to the present invention, Rutotomoni teapot subjected microorganisms from the ground into the ground to follow a contamination route of the oil that reaches from the ground of oil pollution source to the underground oil pollution section, of the pipe Contamination of the oil with an oil adsorbing section comprising a perforated pipe having a hole penetrating through the peripheral surface and the outer peripheral surface and an oil adsorbing material provided in the perforated pipe so as to cover the hole of the perforated pipe Oil is installed by sucking the oil in the oil-contaminated part through the perforated pipe by installing it in the vicinity of the oil-contaminated part formed in the underground aquifer or in the vicinity of the oil-contaminated part through another route. The oil is adsorbed on the adsorbent, and the oil adsorbent adsorbed with oil is taken out on the ground.
After removing the oil adsorbent that has adsorbed oil to the ground, microorganisms are supplied into the perforated pipe installed in the oil-contaminated part of the aquifer, and the microorganisms are passed around the perforated pipe via the hole in the perforated pipe. It is also characterized by having been supplied .
The present invention is also characterized in that the microorganism mixed solution is supplied into the ground by applying pressure to the microorganism mixed solution containing the microorganism and the microorganism culture solution.
It is also characterized in that a microbial mixture having a specific gravity greater than that of water is supplied into the ground so as to follow the pollution route of oil.

According to the method for purifying an oil-contaminated part according to the present invention, microorganisms are supplied so as to follow the oil- contaminated path, and the oil-adsorbing part is routed through a path different from the oil-contaminated path, and the underground aquifer installed oil pollution portions formed or in the vicinity of the oil pollution portion, the oil in the oil contaminated portion is adsorbed on the oil sorbent, since the oil sorbent that has adsorbed the oil was removed on the ground, underground oil It is not necessary to conduct a survey to identify the location of the contaminated area, the survey cost can be reduced, microorganisms can be efficiently supplied to the oil contaminated area in the ground, and The entire oil-contaminated part formed across the aquifer can be efficiently purified.
After removing the oil adsorbent that has adsorbed oil to the ground, microorganisms are supplied into the perforated pipe installed in the oil-contaminated part of the aquifer, and the microorganisms are passed around the perforated pipe via the hole in the perforated pipe. be supplied, it can remove more oil in the oil pollution unit.
Since the microorganism mixed solution is supplied into the ground by applying pressure to the microorganism mixed solution, a large amount of the microorganism mixed solution can quickly reach the oil-contaminated portion, and the oil-contaminated portion can be efficiently purified.
Since the microbial mixture having a specific gravity greater than that of water is supplied to the ground so as to follow the oil pollution route, it becomes easier for the microorganisms to reach the oil-contaminated part of the aquifer and the oil in the oil-contaminated part of the aquifer Is easily decomposed by microorganisms.

Best form 1
The microorganism supply apparatus will be described with reference to FIG. The microorganism supply apparatus 50 includes a microorganism culture apparatus 51, a connection pipe 52, a microorganism injection pump 53, and a microorganism injection pipe 54. The microorganism supply device 50 is a mixture of microorganisms containing microorganisms and a microorganism culture solution from the ground to the ground 8 so as to follow an oil contamination path 56 reaching from the ground oil pollution source 55 to the oil-contaminated portion 2 in the ground 8. Supply liquid. The underground oil-contaminated part 2 is contaminated with oil such as A heavy oil or machine oil in the underground 8 under the building 7 such as a machine factory or in the underground 8 such as a waste disposal site. Area. The oil contamination source 55 on the ground is, for example, a portion where oil stays or oozes on the floor of the building 7 or the surface below the floor, or a portion where oil stagnates or oozes on the ground surface of the ground.

  One end opening of the connection pipe 52 and the injection port 57 of the microorganism culture apparatus 51 are connected to each other, and the other end opening of the connection pipe 52 and the suction port 58 of the microorganism injection pump 53 are connected to each other. And the microorganism injection pump 53 are connected by a connecting pipe 52. One end opening of the microorganism injection tube 54 and the discharge port 59 of the microorganism injection pump 53 are connected to each other, and the other end opening 60 (injection port) 60 of the microorganism injection tube 54 is installed in the oil contamination source 55. The other end opening 60 of the microorganism injection tube 54 is installed in the oil contamination source 55 so as to be embedded in the underground 8 below the oil contamination source 55, for example. In addition, the other end opening 60 side of the microorganism injection tube 54 is fixed to the ground with a fixture so that the other end opening 60 of the microorganism injection tube 54 does not come off from the oil contamination source 55.

  As the microorganism mixed solution, a microorganism mixed solution having a specific gravity larger than that of water is used. For example, a microorganism mixed solution having a specific gravity of 1.02 to 1.07 may be used, but it is preferable to use a microorganism mixed solution having a specific gravity of around 1.05 which is the same as the specific gravity of the bentonite stabilizing solution.

  With reference to FIG. 1, the purification method of the oil-contaminated part using a microorganism supply apparatus is demonstrated. When the microorganism injection pump 53 of the microorganism supply apparatus 50 is driven, the microorganism mixed solution is transferred from the microorganism culture apparatus 51 via the connection pipe 52, the microorganism injection pump 53, and the microorganism injection pipe 54 to the other microorganism injection pipe 54. It is supplied from the end opening 60 to the underground 8 below the oil contamination source 55. Thereby, the microorganism mixed solution reaches the oil-contaminated part 2 in the ground 8 following the oil contamination path 56, and the microorganisms decompose the oil in the oil-contaminated part 2, so that the oil-contaminated part 2 can be purified.

According to the best mode 1, the microorganism mixed liquid is supplied to the underground 8 under the oil contamination source 55 so as to follow the oil contamination path 56 without examining the position of the oil contaminated portion 2 in the underground 8. The cost for investigating the position of the oil-contaminated part 2 in the underground 8 can be reduced, and the microbial mixture can be efficiently supplied to the oil-contaminated part 2 in the underground 8 along the oil contamination path 56. Since the microorganisms decompose the oil in the oil-contaminated part 2, the oil-contaminated part 2 can be efficiently purified.
That is, according to the best mode 1, the investigation cost for investigating the position of the oil-contaminated part 2 in the underground 8 can be reduced, and microorganisms can be efficiently supplied to the oil-contaminated part 2 in the underground 8. Thus, the oil contaminated part 2 can be purified efficiently.
Further, the microorganisms can be efficiently supplied to the oil-contaminated part 2 in the ground 8 without forming the holes for supplying microorganisms as in the prior art, and the oil-contaminated part 2 can be efficiently purified.
In addition, when trying to purify the oil-contaminated part 2 formed in the underground 8 under the building 7 such as a machine factory, the conventional technology is used for supplying microorganisms perpendicular to the underground under the building using an excavator or the like. However, according to the best mode 1, the holes for supplying microorganisms are formed. However, it is difficult to purify the oil-contaminated part formed in the ground under the building. Therefore, even the oil contaminated portion 2 formed in the underground 8 under the building 7 such as a machine factory can be easily purified.

  According to the best mode 1, since the microbial mixed liquid having a specific gravity of 1.02 to 1.07 was used, the microbial mixed liquid that reached the oil-contaminated part 2 along the contamination path 56 was formed in the aquifer 61. Since it becomes easy to sink to the oil-contaminated part 2 and microorganisms easily reach the oil-contaminated part 2 of the aquifer 61, the oil in the oil-contaminated part 2 of the aquifer 61 is easily decomposed by microorganisms.

  According to the best mode 1, since the microorganism mixed solution is supplied to the ground by applying pressure to the microorganism mixed solution by the microorganism injection pump 53, a large amount of the microorganism mixed solution can reach the oil contaminated portion 2 quickly. The oil-contaminated part 2 can be purified efficiently.

Best form 2
Only with the microorganism supply operation by the microorganism supply apparatus 50 of the best mode 1, there is a possibility that the microorganisms that have passed through the oil contamination path 56 do not reach the oil-contaminated part 2 located in the aquifer 61 in the ground 8. Therefore, in the best mode 2, in addition to the microorganism supply operation described in the best mode 1, oil adsorption for efficiently removing the floating oil in the oil contaminated part 2 located in the aquifer 61 of the underground 8 Oil adsorption work by the processing device 70 is also performed. That is, the best mode 2 is a method for efficiently purifying the entire oil-contaminated part 2 by combining the microorganism supply operation by the microorganism supply device 50 of the best mode 1 and the oil adsorption operation by the oil adsorption processing device 70. is there.

  As shown in FIGS. 2 and 3, the oil adsorption treatment device 70 includes a perforated pipe 12 having a plurality of holes 11 penetrating the inner and outer peripheral surfaces of the pipe, and an underground aquifer 61. Of the perforated pipe 12 installed at the position of the oil-contaminated part 2 or the vicinity of the oil-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). An oil adsorbing portion 3 installed inside the perforated tube 12 so as to cover the hole 11 from the inside of the perforated tube 12, a suction device 4, and a connecting tube 6 connecting the perforated tube 12 and the suction device 4. Prepare.

  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 adsorbent pushing rod-like pipe 9 is used to push the oil adsorbing body 17 into a target installation of the oil contaminated portion 2 via a lateral hole 21 described later.

  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 other cylindrical bag 16 from the other end opening of the cylindrical bag 16, the other end opening of the other 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, the oil adsorber 17 is pushed into the perforated pipe 12 installed in the horizontal hole 21 and then the oil adsorbent pushing rod-shaped pipe 9 is passed through the collection wire 20 from the other end of the collection wire 20 to obtain the oil. One end 22 of the adsorbent pushing rod-shaped pipe 9 is pressed against the other end holding plate 19 to push the oil adsorbent 17 to the target installation position of the oil contaminated portion 2, thereby making the oil adsorbent 17 the oil contaminated portion 2. Can be installed at the target installation position. In addition, the oil adsorber 17 that has pulled the other end 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. Thereby, when the perforated pipe 12 and the oil adsorber 17 are installed at the target installation position, the other end of the rod 9 for pushing the oil adsorber, the other end of the connecting pipe 6 and the other end of the recovery wire 20 are respectively horizontal. Go out to the ground from the opening 30 of the hole 21. After the oil adsorber pushing rod-shaped pipe 9 is drawn out and removed, the other end of the connecting pipe 6 and the suction port 23 of the suction device 4 are connected to each other, and the suction device 4 is connected to the connecting pipe 6 and the oil pipe. By sucking the oil in the oil-contaminated part 2 located outside the perforated pipe 12 through the 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. .

  A method for installing the perforated pipe 12 at the target installation position will be described. The distance from the ground surface to the aquifer 61 is measured, and a horizontal hole 21 passing through the target installation position is formed using a free curve excavator (not shown). 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 of the connecting pipe 6 is drawn out from the start end 30 of the horizontal hole 21 to the ground.

  The oil adsorption work by the oil adsorption processing device 70 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 other end of the connecting pipe 6 from the oil adsorbing body 17 side and installed at the target installation position. After the oil adsorber pushing rod pipe 9 is removed, the other end 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.

  The oil adsorption work by the oil adsorption treatment device 70 and the microorganism supply work by the microorganism supply device 50 of the best mode 1 may be performed in combination, and either the oil adsorption work or the microorganism supply work is performed first. The two tasks may be performed at the same time.

  In the best mode 2, the microbe is supplied so as to follow the oil contamination path 56, and the perforated pipe 12 and the perforated pipe 12 having the hole 11 penetrating the inner peripheral surface and the outer peripheral surface of the pipe are provided. The aquifer 61 of the underground 8 is passed through the oil adsorbing part 3 provided with the oil adsorbing material 15 provided in the perforated pipe 12 so as to cover the hole 11 via a path different from the oil contamination path 56. The oil adsorbent 15 is sucked into the oil adsorbent 15 by sucking the oil in the oil-contaminated part 2 through the perforated pipe 12 by installing the oil-contaminated part 2 formed at the target position or in the vicinity of the oil-contaminated part 2. The oil adsorbent 15 having adsorbed and adsorbed oil was taken out on the ground.

  According to the best mode 2, the oil-contaminated part 2 is in the unsaturated zone of the ground 8 by combining the microorganism supply operation by the microorganism supply device 50 of the best mode 1 and the oil adsorption operation by the oil adsorption processing device 70. 62 and the aquifer 61, even if the oil-contaminated part 2 located in the aquifer 61 cannot be purified only by the microorganism supply from the microorganism supply device 50 of the best mode 1, The oil in the oil-contaminated part 2 located in the aquifer 61 that could not be purified can be efficiently removed by the oil adsorption work by the oil adsorption treatment device 70, so that the unsaturated zone 62 and the aquifer 61 in the ground It is possible to efficiently purify the entire oil-contaminated part 2 formed over the straddle. That is, in the prior art, in order to efficiently purify the entire oil-contaminated part in the ground, in addition to the microorganism supply work, pumping work and aeration work are necessary, and the burden of cost, work management, etc. is large. However, in the best mode 2, the entire oil-contaminated part in the ground can be efficiently purified by simple operations including the microorganism supply operation and the oil adsorption operation.

  Further, according to the suction operation of the best mode 2, even when the oil in the oil-contaminated portion 2 is diffused, the oil in the oil-contaminated portion 2 is removed from the inside of the perforated tube 12 by the suction operation by the suction device 4. Therefore, the oil in the oil-contaminated part 2 can be efficiently removed, and the underground oil-contaminated soil can be efficiently purified. 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 3
After the oil adsorbing body 17 is drawn out from the perforated pipe 12 to the ground, the other end of the connecting pipe 6 and the injection port 59 of the microorganism injection pump 53 are connected to each other, and the microorganism injection pump 53 is driven to contain the microorganism mixed solution. By supplying it into the perforated pipe 12, microorganisms adhere to the oil remaining around the perforated pipe 12 via the holes 11 of the perforated pipe 12 and decompose the oil. The microorganism injection pump 53 may use the microorganism injection pump 53 of the microorganism supply apparatus 50 described in the best mode 1, or may be a microorganism injection pump 53 different from the microorganism injection pump 53 of the microorganism supply apparatus 50. It may be used.
According to the best mode 3, 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 4
When the microorganisms are supplied into the perforated tube 12 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. An inner perforated pipe 41 having a hole 39 penetrating the inner and outer peripheral surfaces of the pipe is provided inside the perforated pipe 12 so as to be movable in the direction along the axis of the perforated pipe 12. Packers 42 are provided on the outer peripheral surfaces of both ends of the perforated tube 41, and 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. A microbe is supplied into the perforated tube 12 via the inner perforated tube 41 after the space between the inner perforated tube 12 is closed by the packer 42. 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 microorganism supply 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.

  That is, when supplying microorganisms to the inside of the perforated pipe 12, a microorganism supply pipe device 75 capable of intensively supplying microorganisms to a specific position in the perforated pipe 12 is used. As shown in FIG. 3, the microorganism supply pipe device 75 includes a microorganism supply pipe 45 and a microorganism supply head 77 provided at the tip of the microorganism supply pipe 45. The microorganism supply head 77 is provided on the inner perforated tube 41 attached to the tip opening of the microorganism supply tube 45 so as to communicate with the tip opening of the microorganism supply tube 45, and on the outer peripheral surfaces of both end portions of the inner perforated tube 41. The packer 42 is provided.

  In the best mode 4, after the oil adsorbing material 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, the inside of the perforated tube 12 using the microorganism supply pipe device 75 is used. To supply microorganisms. That is, the inner perforated tube 41 is inserted inside the perforated tube 12, 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 33 and an inner peripheral surface of the perforated tube 12. Block between. The other end of the microorganism supply pipe 45 and the injection port 29 of the microorganism injection pump 53 are connected to each other, and the microorganism mixed solution is supplied into the inner perforated pipe 41. The oil remaining on the periphery of the perforated pipe 12 through the holes 39 and the holes 11 of the perforated pipe 12 adheres to the oil and decomposes.

  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.

Best form 5
When adsorbing oil from the oil-contaminated part, an oil adsorbing part having an oil adsorbing material 15 provided on the outer peripheral surface of the perforated pipe 12 so as to cover the hole 11 of the perforated pipe 12 may be used. . The oil adsorbent 15 may have a configuration covered with the cylindrical bag 16. When this oil adsorbing part 3 is used, the oil in the oil contaminated part 2 is adsorbed by the oil adsorbing material 15 by sucking the groundwater through the perforated pipe 12 in the state of FIG. Thereafter, if microorganisms are supplied into the perforated tube 12, the microorganisms decompose the oil adsorbed on the oil adsorbing material 15. At this time, if the microorganism supply pipe device 75 described in the best mode 4 is inserted into the perforated tube 12 and the microorganisms are supplied, the effect of the best mode 4 can be obtained.

  Instead of using the microbial injection pump 53, the microbial culture apparatus 51 and the contamination source 55 may be connected by the microbial injection tube 54 to supply the microbial mixture from the microbial culture apparatus 51 to the contamination source 55.

The schematic block diagram which shows the purification method of an oil-contaminated part (best form 1). The schematic block diagram which shows the purification method of an oil-contaminated part (best form 2). Sectional drawing of oil adsorption processing pipe | tube (best form 2, 3). Sectional drawing of oil adsorption processing pipe | tube (best form 4). Sectional drawing of oil adsorption processing pipe | tube (best form 5).

Explanation of symbols

2 oil-contaminated part, 3 oil adsorbing part, 11 holes, 12 perforated pipes, 15 oil adsorbing material,
55 Oil pollution sources, 56 pollution routes, 61 aquifers.

Claims (4)

Microorganisms are supplied from the ground to the ground so as to follow the oil pollution path from the oil pollution source on the ground to the oil contamination section in the ground, and a hole penetrating the inner peripheral surface and outer peripheral surface of the pipe is formed. The oil adsorbing portion having the perforated pipe having the perforated pipe and the oil adsorbing material provided in the perforated pipe so as to cover the hole of the perforated pipe is passed through a path different from the oil contaminated path and Oil that is installed in or near the oil-contaminated part formed in the aquifer and sucks oil from the oil-contaminated part through the perforated pipe to adsorb the oil to the oil adsorbent and absorbs the oil. method of purifying oil contaminated portion, characterized in that the eject the adsorbent earth. After removing the oil adsorbent that has adsorbed oil to the ground, microorganisms are supplied into the perforated pipe installed in the oil-contaminated part of the aquifer, and the microorganisms are passed around the perforated pipe via the hole in the perforated pipe. The method for purifying an oil-contaminated part according to claim 1 , wherein The method for purifying an oil-contaminated part according to claim 1 or 2 , wherein the microorganism mixture solution is supplied into the ground by applying pressure to a microorganism mixture solution containing microorganisms and a microorganism culture solution. 4. The method for purifying an oil-contaminated part according to claim 3 , wherein a microorganism mixed liquid having a specific gravity greater than that of water is supplied into the ground so as to follow the oil contamination route.

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