JP6944796B2 - Oil recovery method - Google Patents

Description

The present invention relates to a method for recovering oils in the ground.

Conventionally, as a method of purifying soil contaminated with oils, there is a method of injecting air or chemicals from an injection well provided in the ground and recovering oils from an oil recovery well (see, for example, Patent Document 1). rice field. In addition, there are also a method of promoting volatilization of oils by injecting air (sparging) and sucking volatilized gas by a well point or the like, and a method of promoting microbial decomposition by activating underground microorganisms.

As a method of purifying soil contaminated with organic compounds and heavy metals, there is a method of injecting air or a chemical from an injection well and recovering groundwater using a drain pipe (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2007-253059 JP-A-2007-260610

In the conventional soil purification method, it is necessary to install wells at high density in order to efficiently inject various gases and liquids into the ground. However, if a well is installed by the existing method, the construction period becomes long and the construction cost increases, so that it is difficult to install the well at a high density, and the recovery efficiency of the volatile gas may decrease. Further, in the suction by the well point, since the suction is performed only by the strainer portion, there is a problem that the suction portion is clogged or the suction depth becomes a point.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is that it is possible to install equipment for injection and suction at low cost and in a short period of time at high density, and the position of the oil film layer. It is an object of the present invention to provide a method for recovering oils, which can follow the fluctuation of the oil content and can efficiently recover the oil content from the ground for a long period of time.

In order to achieve the above-mentioned object, the first invention is a method for recovering oils in the ground, which comprises a step a of placing a plurality of drainage materials in the vicinity of the groundwater surface where an oil film layer exists, and a step a of the oils. while monitoring the content, and a step b of recovering the drain material aspirated by connecting a vacuum pump the oils to a predetermined stage, the suction by the vacuum pump is stopped, in response to said monitoring results of the oils It said drain material itself by supplying nutrients oxygen and microorganisms inside drain material anda step c to microbial carrier, to repeat said step c and said step b, in the water table near, This is a method for recovering oils, which comprises making the voids of the drain material larger than the voids of other portions.
The second invention is a method for recovering oils in the ground, in which a step a of placing a plurality of drain materials in the vicinity of the ground water surface where an oil film layer exists and the drain while monitoring the content of the oils. Step b in which the material is connected to a vacuum pump and sucked to recover the oils to a predetermined stage, and suction by the vacuum pump is stopped, and oxygen and microorganisms are contained inside the drain material according to the monitoring result of the oils. A step c of supplying a nutrient salt and using the drain material itself as a microbial carrier is provided, and the step b and the step c are repeated, and a plurality of the drain materials are arranged in layers in the vicinity of the groundwater surface. This is a method for recovering oils, which is characterized by the above.
The third invention is a method for recovering oils in the ground, in which a step a of placing a plurality of drain materials in the vicinity of the ground water surface where an oil film layer exists and the drain while monitoring the content of the oils. The drain material in a state where the material is connected to a vacuum pump and sucked to recover the oils to a predetermined stage, and the suction by the vacuum pump is stopped and the suction is interrupted according to the monitoring result of the oils. A method for recovering oils, which comprises a step c of supplying oxygen and microbial nutrients to the inside and using the drain material itself as a microbial carrier, and repeating the steps b and c. be.
The fourth invention is a method for recovering oils in the ground, in which a plurality of drain materials in which a fluid that promotes the growth of microorganisms is infiltrated in advance is placed in the vicinity of the groundwater surface where the oil film layer exists. And, while monitoring the content of the oils, the step b of connecting the drain material to the vacuum pump and sucking the oils to a predetermined stage, and stopping the suction by the vacuum pump to monitor the oils. A step c of supplying oxygen and microbial nutrients to the inside of the drain material according to the result and using the drain material itself as a microbial carrier is provided, and the step b and the step c are repeated. This is a method for recovering oils.

In the step a of placing the plurality of drain materials, it is possible to perform the drain materials at a plurality of depths by performing the driving at a plurality of times as well as the case of performing the driving at a plurality of times. Further, it is also possible to use an integrated drain having suction portions at a plurality of depths instead of a plurality of drain materials.

In the present invention, oxygen and microbial nutrients are supplied to the inside of the drain material to proliferate and retain the microorganisms on the surface of the drain material, and the drain material itself is used as a microbial carrier at a high concentration, thereby efficiently containing oil. Can be disassembled. Further, by using a drain material for oil suction without using a well, inexpensive and quick construction can be facilitated, and oil suction points can be installed at a high density. Further, since the suction portion of the drain material has a predetermined length in the depth direction, the suction range can be made to follow the oil film layer even when the width and depth of the oil film layer are increased or decreased. Since the suction portion has a predetermined length, the drain material is less likely to be clogged with the suction portion as compared with the case of using a well point for suction with a strainer at the tip, and can be used for a long period of time.

In step c, a pH regulator and / and an oxygen source may be supplied. The oxygen source is, for example, a gas containing oxygen such as air, pure oxygen, or ozone, a solution containing a peroxide that generates oxygen such as hydrogen peroxide solution, or a gas such as air, pure oxygen, or ozone. , A solution containing oxygen dissolved in nanobubbles and a gas generating oxygen, and a solution containing oxygen generated by electrolysis of water can be used.
If necessary, a pH adjuster and / or an oxygen source such as hydrogen peroxide solution can be supplied to adjust the inside of the drain material to environmental conditions suitable for microbial growth.

In the first invention, in the water table near, larger than the gap of the other portions of the gap of the drain member.
If the voids of the drain material are made larger than the voids of other parts in the vicinity of the groundwater surface, clogging of the drain material can be reduced.

In the second invention, a plurality of the drain materials are arranged in layers in the vicinity of the groundwater surface.
By arranging a plurality of drainage materials in a stack near the groundwater surface, an environment in which microorganisms can easily inhabit can be obtained.

In the step a, a plurality of the drain materials may be cast so that the suction portions are arranged at different depths in the ground.
In the step a, a plurality of the drain materials having different lengths of the suction portions may be cast.
If multiple drain materials are placed so that the suction parts are arranged at different depths in the ground, or if multiple drain materials with different lengths of the suction parts are placed, the depth of the oil film layer can be raised or lowered. Even in this case, by selecting and operating the drain material in which the suction part is located at the depth corresponding to the oil film layer, not only the oils can be recovered but also the pH adjuster and oxygen source can be supplied near the oil film layer. It will be possible.

In the step a, the drain material may be arranged at a predetermined angle with respect to the vertical direction.
If the drain material is arranged at a predetermined angle with respect to the vertical direction, the area of the suction portion located in the oil film layer becomes large, and oils can be efficiently recovered.

It is desirable that the drain material has a contact angle of the basic material with water of 70 ° to 130 °.
By setting the contact angle of the basic material with water to 70 ° to 130 ° and using a drain material with improved water repellency and lipophilicity, microorganisms that are oil-degrading bacteria can be efficiently accumulated in the drain material.

According to the present invention, it is possible to install equipment for injection and suction at low cost and at high density in a short period of time, it is possible to follow fluctuations in the position of the oil film layer, and efficiently recover oil from the ground for a long period of time. It is possible to provide a method for recovering oils that can be used.

The figure which shows the outline of the recovery device 2. The figure which shows the arrangement of the drain material 1. The figure which shows the cross section of the drain material 1. The figure which shows each process for recovering oils of the ground 9. The figure which shows the other drain material 39 The figure which shows the outline of the recovery device 2a. The figure which shows the outline of the recovery device 2b. The figure which shows the example which installed the drain material diagonally

Hereinafter, the first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an outline of the recovery device 2, and FIG. 2 is a diagram showing an arrangement of the drain material 1. FIG. 1 is a cross-sectional view taken along the line BB shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. FIG. 3 is a diagram showing a cross section of the drain material 1. FIG. 3A is a cross-sectional view taken along the line DD shown in FIG. 3B. FIG. 3B is a cross-sectional view taken along the line CC shown in FIG. 3A.

As shown in FIGS. 1 and 2, the recovery device 2 includes a plurality of drain materials 1, a hose 11, a valve 13, a liquid injection hose 15, a liquid supply tank 17, a liquid drain hose 19, a vacuum pump 21, and a water treatment facility 23. , A separate tank 28, a well 31 and the like.

As shown in FIG. 2, the drain material 1 is placed in the oil recovery target range of the ground 9 at predetermined intervals in the front-rear and left-right directions. The distance between the drain materials 1 is, for example, about 1 m. As shown in FIG. 1, a cap 5 is attached to the upper end of the drain material 1. A first sealing material 7 is provided at the boundary between the drain material 1 and the cap 5. The first sealing material 7 prevents the inflow of air or the like from the gap between the drain material 1 and the cap 5. A second sealing material 3 is provided at the lower end of the drain material 1. By providing the second sealing material 3, the inflow of water from the cross section of the lower end of the drain material 1 into the inside of the drain material 1 is prevented.

As shown in FIG. 1, in the drain material 1, the portion between the first sealing material 7 and the second sealing material 3 functions as a suction portion 29. The length of the suction portion 29 is set according to the thickness of the target oil film layer 27. It is desirable that the drain material 1 is cast in the ground 9 so that the suction portion 29 is located in the oil film layer 27.

As shown in FIG. 1, the tip of the cap 5 of the drain material 1 is connected to the lower end of the hose 11. The upper end of the hose 11 is connected to the valve 13. A liquid injection hose 15a branched from the liquid injection hose 15 and a liquid drain hose 19a branched from the drain hose 19 are connected to the valve 13. The liquid injection hose 15 is connected to the liquid supply tank 17. The drain hose 19 is connected to the separate tank 28. The separate tank 28 is connected to the vacuum pump 21 via the drain hose 19b and to the water treatment facility 23 via the drain hose 19c. The drainage hose 19 is connected to the observation tank 22 by two drainage hoses 19d that branch in front of the separate tank 28. A valve 26 is provided on the two drainage hoses 19d. Further, the drainage hose 19 is provided with a valve 24 between the branch points with the two drainage hoses 19d.

As shown in FIG. 3, the drain material 1 includes a core material 33 having a water passage groove (not shown) and a filter non-woven fabric portion 35 that covers the surface of the core material 33. The drain material 1 is based on the material of the filter non-woven fabric portion 35, which is expected to have a relatively water-repellent effect because of its high lipophilicity, but it is also possible to use a plastic drain or a paper drain with further improved water-repellent performance. be. The contact angle of the basic material is so easy that it can pass through the material so that it cannot be measured with oil, but it has a condition of 80 ° or more with respect to water. The contact angle is measured by observing the situation when a drop of liquid is placed on the material with an optical mirror and measuring the angle with a CA-S micro type 2 single fiber contact angle meter.

In order to enhance the water repellency and lipophilicity of the drain material 1, for example, a water repellent additive or a lipophilic additive is used. The water-repellent additive material is a fluororesin, a silicone resin, or the like which is a water-repellent component, and the water-permeable performance of the filter nonwoven fabric portion 35 is lowered by applying a water-repellent treatment to the filter nonwoven fabric portion 35 using these resins or the like. Can be done. In particular, the non-woven fabric, which is a three-dimensional fiber aggregate, is characterized by having a large number of minute voids 37, and therefore has a large effect when the fiber surface is water-repellent, facilitating the separation of oil and water. Further, the lipophilic additive material is a silicone grease, a polypropylene film, a polyethylene film, an ethylene-vinyl acetate copolymer resin film, or the like, and by attaching these oil-dissolved films to the filter non-woven fabric portion 35, a portion in contact with oil is formed. The oil can be recovered preferentially by dissolving only the film of.

The core material 33 of the drain material 1 has a function of collecting only liquid from the soil into the drain material 1, and the filter non-woven fabric portion 35, which is a porous body, has excellent filtration performance. In the filter non-woven fabric portion 35, it is desirable that the pore diameter of the void 37b in the vicinity of the oil film layer 27 near the groundwater surface 25 is larger than the pore diameter of the void 37a in the other portion. The voids 37 of the filter non-woven fabric portion 35 may have a pore size that prevents the inflow of soil particles, and have a water-repellent effect and are 100 μm or less in that the ground containing fine particles such as clay and silt prevents the inflow of soil particles. Is even better. Efficiently fulfill the water collection function may if permeability is 1.0 × 10 -2 ^{cm /} sec or more Sand, the pore size of the case is approximately equal to or greater than 30 [mu] m, more precise filtration function This is not the case if necessary.

FIG. 4 is a diagram showing each step for recovering oils in the ground 9. FIG. 4A is a diagram showing a step of recovering oils, and FIG. 4B is a diagram showing a step of supplying oxygen and microbial nutrients to the inside of the drain material 1.

In order to recover the oils in the ground 9, first, a plurality of drain materials 1 are placed at predetermined intervals in the ground 9 near the groundwater surface 25 where the oil film layer 27 exists, and the recovery device 2 as shown in FIG. Prepare. After preparing the recovery device 2, in the step shown in FIG. 4A, the vacuum pump 21 is operated with the valve 24 opened and the valve 26 closed, and the drain material 1 is used as the ground as shown by the arrow E. The liquid is sucked from the oil film layer 27 of 9.

In the step shown in FIG. 4A, the vacuum pump 21 may be operated with the valve 24 closed and the valve 26 opened to suck the liquid, and the sucked liquid may be observed in the observation tank 22. The pumped liquid sucked by the vacuum pump 21 is separated into a gas and a liquid in the separate tank 28, and the liquid is collected in the water treatment facility 23. Depending on the situation, the liquid is separated into water and oil at the water treatment facility 23 and drained, or reused for circulation.

When the vacuum pump 21 is operated to suck the liquid from the oil film layer 27 of the ground 9 with the drain material 1, the liquid sucked by each drain material 1 contains oils in the liquid and air while sucking. And monitor environmental conditions such as drainage and pH. Further, in parallel with these monitoring, the well 31 is used to grasp the groundwater table 25 of the ground 9, the thickness of the oil film layer 27, and the like.

In monitoring, for example, the ratio of oil, water, and air in the liquid sucked by each drain material 1 and the electrical conductivity of the liquid passing through each drain material 1 or the drain hose 19a connected to each drain material 1. From the measured values of, grasp the relative and local concentration distribution of the oils remaining in the target range. Then, based on the grasped concentration distribution, the groundwater level of the ground 9 grasped by using the well 31, the thickness of the oil film layer 27, and the like, it is determined whether or not the oils have been recovered to a predetermined stage. Then, among the plurality of drain materials 1, the drain material 1 that has not been collected up to a predetermined stage continues suction, and the drain material 1 that has been collected up to a predetermined stage stops suction.

After stopping the suction by the vacuum pump 21, in the step shown in FIG. 4B, as shown by the arrow F, oxygen and microbial nutrients are supplied from the liquid supply tank 17 to the inside of the drain material 1 in which the suction is interrupted. do. At this time, if necessary, microorganisms, a pH adjuster, an oxygen source such as hydrogen peroxide solution, a cleaning agent, or the like may be supplied to the inside of the drain material 1.

Oil volatilizes when oxygen is injected into the ground 9 or in the groundwater under the oil film layer 27 to promote the volatilization of oil, or when a saturated oil film is pushed up in the ground 9 to create a situation where it is easy to volatilize. Is promoted. Further, by supplying an oxygen source such as oxygen, a nutrient salt, a pH adjuster, and a hydrogen peroxide solution to adjust the inside of the drain material 1 to environmental conditions suitable for the growth of microorganisms, microorganisms grow on the surface of the drain material 1. Then, the drain material 1 itself becomes a microbial carrier in which microorganisms are retained at a high concentration, and oil decomposition by microorganisms is promoted. If the cleaning agent is supplied to the drain material 1, the emulsification of the oil content is promoted.

After the step shown in FIG. 4B, the step shown in FIG. 4A and the step shown in FIG. 4B are repeated as many times as necessary. In the second and subsequent steps shown in FIG. 4 (a), the drain material 1 sucks the gas volatilized by the supply of oxygen in the step shown in FIG. 4 (b) and the oil that has become easy to move due to the emulsification of the oil. As a result, the oil content can be efficiently recovered. Further, if the liquid sucked in the step shown in FIG. 4 (a) is used and circulated during the supply in the step shown in FIG. 4 (b), a loop decomposed by microorganisms can be formed.

As described above, in the first embodiment, oxygen and microbial nutrients are supplied to the inside of the drain material 1 to grow and hold the microorganisms on the surface of the drain material 1, and the drain material 1 itself is maintained at a high concentration. By using a microbial carrier, oil can be efficiently decomposed. Since the drain material 1 has a large amount of fine voids 37 and has a large surface area, it can provide a habitat for microorganisms and is effective in decomposing oils by microorganisms. Further, by using the drain material 1 having improved water repellency and lipophilicity, oil-degrading bacteria can be efficiently accumulated in the drain material 1.

In the first embodiment, the drain material 1 is used for pumping oil without using a well, so that the recovery device 2 can be easily installed. If the recovery device 2 is used, suction can be performed at a plurality of points with one recovery device, and pumping points can be installed at a high density. Further, since the suction portion 29 of the drain material 1 has a predetermined length in the depth direction, the suction range can be made to follow the oil film layer even when the width and depth of the oil film layer 27 are increased or decreased.

Since the suction portion 29 has a predetermined length, the drain material 1 can be sucked on a surface, and the gap 37 of the suction portion 29 is less likely to be clogged as compared with the case where the drain material 1 is sucked at a point, which is efficient. Effective for good suction and long-term use. If the pore diameter of the void 37b near the oil film layer 27 is made larger than the pore diameter of the void 37a in the other portion, the possibility of clogging can be further reduced.

In the first embodiment, the liquid sucked by the drain material 1 is used to monitor the environmental conditions such as the content of oils, the concentration of air and nutrients, and the pH, and the well 31 is used to monitor the groundwater level of the ground 9. By grasping the thickness of the oil film layer 27 and the like, it becomes possible to select the drain material 1 for sucking and the drain material 1 for interrupting suction based on these. If only the drain material 1 suitable for suction is selected and operated, excess drainage and suction energy can be omitted, and oil can be efficiently recovered.

In the first embodiment, as a method of adding water repellency and lipophilicity of the drain material 1 in order to efficiently accumulate oil-degrading bacteria on the drain material 1, the filter non-woven fabric portion 35 is hydrophobic or lipophilic. A non-woven fabric made of polypropylene, polyethylene, polyester, polyamide, acrylic or glass fiber may be used, or a non-woven fabric made of fibers impregnated with water-repellent or lipophilic components such as fluororesin or coated fibers may be used. Further, the drain material 1 may be infiltrated in advance with a fluid that promotes the growth of oil-degrading bacteria such as liquid paraffin and kerosene.

In the first embodiment, the pore diameter of the void 37b near the oil film layer 27 of the drain material 1 is made larger than the pore diameter of the void 37a of the other portion, but a drain material having such a configuration may be used. FIG. 5 is a diagram showing another drain material 39.

The drain material 39 shown in FIG. 5 is formed by superimposing another 1 g of another drain material on the surface of the drain material 1 shown in FIG. 3 in the vicinity of the oil film layer 27 near the groundwater table 25. By using the drain material 39 in which a plurality of drain materials are arranged in a stack in the vicinity of the groundwater surface 25, it is possible to create an environment in which microorganisms are more likely to inhabit as compared with the drain material 1 shown in FIG.

In the first embodiment, the independent drain materials are placed in the separate holes, but it is also possible to place the drain materials at a plurality of depths with one placement. Further, it is also possible to use an integrated drain having suction portions at a plurality of depths instead of a plurality of drain materials.

Next, the second embodiment will be described. FIG. 6 is a diagram showing an outline of the recovery device 2a. The recovery device 2a has almost the same configuration as the recovery device 2 shown in FIG. 1, but instead of the plurality of drain materials 1 having the same suction portion length, the plurality of drain materials 1a having different suction unit lengths 1a. 1b and 1c are used. The drain materials 1a, 1b, and 1c have the same material and composition as the drain material 1, and are cast on the ground 9. The drain materials 1a, 1b, and 1c are arranged so that, for example, the drain materials having different lengths of the suction portions are adjacent to each other.

To recover the oils in the ground 9, first, as shown in FIG. 6, drain materials 1a, 1b, and 1c are placed in the oil recovery target range of the ground 9 at predetermined intervals, and a recovery device 2a is prepared. do. Then, as in the first embodiment, the drain materials 1a, 1b, and 1c are connected to a vacuum pump and sucked while monitoring the content of oils. In the recovery device 2a, the oils are recovered to a predetermined stage from the relative and local concentration distribution of the remaining oils grasped by monitoring, the groundwater level and the oil film layer thickness of the ground 9 grasped by using the well, and the like. If it is determined that the drain material has been sucked, the suction with the corresponding drain material is interrupted in sequence. In addition, even if it is determined that the groundwater level 25a and the depth of the oil film layer 27a change with the recovery of oils and suction cannot be performed from the suction portions 29a, 29b, 29c, the suction with the corresponding drain material is interrupted. do.

After stopping the suction by the vacuum pump, oxygen, microbial nutrients, pH adjuster, oxygen source such as hydrogen peroxide solution, cleaning agent, etc. are added to the inside of the drain materials 1a, 1b, 1c according to the monitoring result of oils. The drain materials 1a, 1b, and 1c themselves are used as microbial carriers. After that, the step of sucking and the step of stopping suction and supplying oxygen, microbial nutrients, etc. are repeated as many times as necessary.

In the second embodiment, in addition to the same effect as in the first embodiment, a plurality of drain materials 1a, 1b, and 1c having different lengths of the suction portions are cast on the ground 9 to form an oil film layer. When the depth of 27a is increased or decreased, the suction range can be made to follow the oil film layer 27a better. In the second embodiment, independent drains having different lengths of suction portions are driven into separate holes, but a pair of drains having a plurality of suction portions may be driven into one hole. .. Further, a plurality of drains may be driven into one hole.

Next, a third embodiment will be described. FIG. 7 is a diagram showing an outline of the recovery device 2b. The recovery device 2b has almost the same configuration as the recovery device 2 shown in FIG. 1, but the suction portions are arranged at different depths instead of the plurality of drain materials 1 arranged at the same depth of the suction portions. A plurality of drain materials 1d, 1e, 1f are used. The drain materials 1d, 1e, and 1f have the same material and structure as the drain material 1, and are cast on the ground 9 so that the suction portions are arranged at different depths. The drain materials 1d, 1e, and 1f are arranged so that, for example, the drain materials having different depths of the suction portions are adjacent to each other.

To recover the oils in the ground 9, first, as shown in FIG. 7, drain materials 1d, 1e, and 1f are placed in the oil recovery target range of the ground 9 at predetermined intervals, and a recovery device 2b is prepared. do. Then, as in the first embodiment, the drain materials 1d, 1e, and 1f are connected to a vacuum pump and sucked while monitoring the content of oils. In the recovery device 2b, the oils are recovered to a predetermined stage from the relative and local concentration distribution of the remaining oils grasped by monitoring, the groundwater level of the ground 9 and the oil film layer thickness grasped by using the well, and the like. If it is determined that the drain material has been sucked, the suction with the corresponding drain material is interrupted in sequence. In addition, even if it is determined that the depth of the groundwater level 25b and the oil film layer 27b fluctuates due to the recovery of oils and suction cannot be performed from the suction portions 29d, 29e, 29f, the suction with the corresponding drain material is interrupted. do.

After stopping the suction by the vacuum pump, the drain material 1d, 1e, 1f is supplied with oxygen, microbial nutrients, pH adjuster, hydrogen peroxide solution, cleaning agent, etc. according to the monitoring result of the oils to drain. The materials 1d, 1e, and 1f themselves are used as microbial carriers. After that, the step of sucking and the step of stopping suction and supplying oxygen, microbial nutrients, etc. are repeated as many times as necessary.

In the third embodiment, in addition to the same effect as in the first embodiment, a plurality of drain materials 1d, 1e, and 1f in which the suction portions are arranged at different depths are cast on the ground 9. Even when the depth of the oil film layer 27b is increased or decreased, the suction range can be made to follow the oil film layer 27b better. In the third embodiment, independent drains having different depths of suction portions are driven into separate holes, but a pair of drains having a plurality of suction portions may be driven into one hole. Further, a plurality of drains may be driven into one hole.

In addition, also in the 2nd and 3rd embodiments, a plurality of drain materials may be arranged in a stack in the vicinity of the groundwater surface, as in the example shown in FIG.

In the first to third embodiments, the drain material is cast in the vertical direction, but the installation angle of the drain material is not limited to this. FIG. 8 is a diagram showing an example in which the drain material is installed obliquely. The drain material 1h shown in FIG. 8 is arranged at a predetermined angle with respect to the vertical direction.

As shown in FIG. 8, if the drain material 1h is arranged at a predetermined angle with respect to the vertical direction, the area of the suction portion 29h located in the oil film layer 27c becomes large, and oils can be efficiently recovered.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention does not depend on the above-described embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 39 ………… Drain material 2, 2a, 2b ………… Recovery device 3, 7 ………… Sealing material 5 ………… Cap 9 …… … Ground 11 ……… Hose 13 ……… Valve 15, 15a ……… Injection hose 17 ……… Liquid supply tank 19, 19a, 19b, 19c, 19d ……… Drainage hose 21 ……… Vacuum pump 22 ……… Observation tank 23 ……… Water treatment facility 24, 26 ……… Valve 25, 25a, 25b, 25c ……… Ground water surface 27, 27a, 27b, 27c ……… Oil film layer 28 ……… Separate tank 29 , 29a, 29b, 29c, 29d, 29e, 29f, 29h ………… Suction part 31 ………… Well 33 ………… Core material 35 ………… Filter non-woven part 37, 37a, 37b ………… Void

Claims (9)

It is a method of recovering oils in the ground.
Step a of placing a plurality of drainage materials near the groundwater surface where the oil film layer exists, and
A step b in which the drain material is connected to a vacuum pump and sucked while monitoring the content of the oils, and the oils are recovered to a predetermined stage.
A step c to the suction by the vacuum pump is stopped, the drain member itself microorganism carrier by supplying the nutrients of oxygen and microorganisms inside the drain material according to monitoring results of the oils,
Equipped with
Just repeat said step c and said step b,
A method for recovering oils , which comprises making the voids of the drain material larger than the voids of other portions in the vicinity of the groundwater surface. It is a method of recovering oils in the ground.
Step a of placing a plurality of drainage materials near the groundwater surface where the oil film layer exists, and
A step b in which the drain material is connected to a vacuum pump and sucked while monitoring the content of the oils, and the oils are recovered to a predetermined stage.
A step c to the suction by the vacuum pump is stopped, the drain member itself microorganism carrier by supplying the nutrients of oxygen and microorganisms inside the drain material according to monitoring results of the oils,
Equipped with
Just repeat said step c and said step b,
A method for recovering oils, which comprises arranging a plurality of the drain materials in a stack in the vicinity of the groundwater surface. It is a method of recovering oils in the ground.
Step a of placing a plurality of drainage materials near the groundwater surface where the oil film layer exists, and
A step b in which the drain material is connected to a vacuum pump and sucked while monitoring the content of the oils, and the oils are recovered to a predetermined stage.
Step c in which oxygen and microbial nutrients are supplied to the inside of the drain material in a state where suction by the vacuum pump is stopped and suction is interrupted according to the monitoring result of the oils, and the drain material itself is used as a microbial carrier. When,
Equipped with
A method for recovering oils, which comprises repeating the step b and the step c. It is a method of recovering oils in the ground.
A step a of placing a plurality of drainage materials in which a fluid that promotes the growth of microorganisms has been infiltrated in advance in the vicinity of the groundwater surface where the oil film layer exists, and
A step b in which the drain material is connected to a vacuum pump and sucked while monitoring the content of the oils, and the oils are recovered to a predetermined stage.
Step c of stopping the suction by the vacuum pump, supplying oxygen and microbial nutrients to the inside of the drain material according to the monitoring result of the oils, and using the drain material itself as a microbial carrier.
Equipped with
A method for recovering oils, which comprises repeating the step b and the step c. The method for recovering oils according to any one of claims 1 to 4, wherein in the step c, a pH adjuster and / and an oxygen source are supplied. The oil according to any one of claims 1 to 5 , wherein in the step a, a plurality of the drain materials are cast so that the suction portions are arranged at different depths in the ground. How to collect crabs. The method for recovering oils according to any one of claims 1 to 5 , wherein in the step a, a plurality of drain materials having different lengths of suction portions are cast. The method for recovering oils according to any one of claims 1 to 5 , wherein in the step a, the drain material is arranged at a predetermined angle with respect to the vertical direction. The method for recovering oils according to any one of claims 1 to 8 , wherein the drain material has a contact angle of the basic material with water of 70 ° to 130 °.

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