JP2005131488A - Method and system for treating oil-polluted soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-polluted soil treatment method capable of efficiently removing an oil component from oil-polluted soil with high precision, and an oil-polluted soil treatment system. <P>SOLUTION: The oil-polluted soil treatment system is equipped with a hopper 321 for receiving oil-polluted earth and sand, an oil adsorbent feeder 322 for feeding an oil adsorbent, a mixer 312 for stirring and mixing the earth and sand received in the hopper 321 along with the oil adsorbent fed from the oil adsorbent feeder 322 to bond the oil component in the earth and sand by the oil adsorbent, a washing liquid supply part 18 for supplying a washing liquid, and a washing treatment device 15 for stirring the earth and sand mixed with the oil adsorbent in the washing liquid supplied from the washing liquid supply part 18 and separating the oil component bonded to the oil adsorbent from the earth and sand to float the same in the washing liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an oil-contaminated soil treatment method and system for separating oil from oil-contaminated oil-contaminated soil to produce reusable clean soil.

  Conventionally, oil-contaminated soil has been discarded to a final disposal site, or heat-treated to incinerate or oxidatively decompose oil. However, the disposal process is not a preferable measure from the viewpoint of the capacity of the final disposal site, and the heat treatment requires a large amount of energy and processing facilities. In recent years, bioprocessing in which oil is decomposed and removed by microorganisms has attracted attention, but this bioprocessing requires a long period of time for processing.

  In contrast, air-dried oil-contaminated soil is mixed with powdered kaolin clay, which is an oil-absorbing fine substance. There is a method of separating and removing (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-57684

  As described above, in the above-described prior art, a method in which oil contained in oil-contaminated soil is absorbed in powder kaolin clay, and then the powder kaolin clay that has absorbed oil is classified by a sieve to separate the oil from the earth and sand. In general, it is difficult to sort clay from earth and sand with a sieve. Moreover, since powdered kaolin clay is a fine body having a very small particle size, it is actually very difficult to select powdered kaolin clay that has absorbed oil with a sieve.

  The present invention has been made based on the above-described matters, and an object thereof is to provide an oil-contaminated soil treatment method and an oil-contaminated soil treatment system that can remove oil from oil-contaminated soil with high accuracy and efficiency. There is.

In order to achieve the above object, the first invention includes a step of adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering oil in the sand to the oil adsorbent; And cleaning the mixed earth and sand to separate the oil adhering to the oil adsorbent from the earth and sand.

  The second invention includes a step of adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering the oil content in the sand to the oil adsorbent, and the soil mixed with the oil adsorbent in the washing liquid. And the step of separating the oil adhering to the oil adsorbent from the earth and sand and removing the oil that floated in the state adhering to the oil adsorbent.

  In addition, the third invention includes a step of adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering the oil content in the sand to the oil adsorbent, and the soil mixed with the oil adsorbent in the washing liquid. And a step of separating the oil adhering to the oil adsorbent from the earth and sand and extracting the suspended water near the surface of the cleaning liquid containing the oil and foreign matter floating in the state adhering to the oil adsorbent. To do.

  In addition, a fourth invention is characterized in that, in any one of the first to third inventions, the oil adsorbent is a substance having a specific gravity smaller than that of water.

  Further, a fifth invention is characterized in that in any one of the first to fourth inventions, the oil adsorbent is at least one of sawdust, hydrocarbon polymer, waste paper cotton, and polypropylene. .

  Moreover, 6th invention received the earth and sand contaminated with oil, mixed the received earth and sand with an oil adsorbent, and mixed the oil adsorbent with the mixing apparatus which adheres the oil content in the earth and sand to the oil adsorbent. It is characterized by comprising a cleaning treatment device for stirring the earth and sand in the cleaning liquid, separating the oil adhering to the oil adsorbent from the earth and sand and floating in the cleaning liquid.

  Further, according to a seventh aspect of the present invention, a hopper that receives soil contaminated with oil, an oil adsorbent supply device that supplies oil adsorbent, and earth and sand received in the hopper are supplied from the oil adsorbent supply device. A mixing device that stirs and mixes with the oil adsorbent, and adheres the oil in the sand to the oil adsorbent, a cleaning liquid supply unit that supplies the cleaning liquid, and a cleaning liquid that is supplied from the cleaning liquid supply unit. And a washing treatment device for separating the oil adhering to the oil adsorbent from the earth and floating in the washing liquid.

  In addition, an eighth invention is characterized in that, in the sixth or seventh invention, a dehydrating device for separating floating solids from the suspended water discharged from the cleaning treatment device is provided.

  Further, a ninth invention is characterized in that, in the above-mentioned eighth invention, an oil / water separation device is provided that removes the remaining oil from the cleaning liquid from which the solid content has been removed by the dehydrator and circulates it to the cleaning treatment device. And

  According to the present invention, the oil component in the oil-contaminated soil is adsorbed in advance to an oil adsorbent having a specific gravity smaller than that of water, and the oil adsorbent adsorbing the oil component is floated in the cleaning liquid by a subsequent cleaning process. Therefore, it is possible to remove and remove oil from the oil-contaminated soil with high accuracy and efficiency, and to obtain clean soil.

Hereinafter, an embodiment of the oil-contaminated soil treatment system of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an oil-contaminated soil treatment method system of the present invention.
In FIG. 1, 300 is a mixing processing unit for mixing oil-contaminated soil with an oil adsorbent, and adhering the oil content in the oil-contaminated soil to the oil adsorbent. It has a hopper 321 to receive, an oil adsorbent supply device 322 for supplying the stored oil adsorbent, and a mixing device 312 for mixing the oil-contaminated soil and the oil adsorbent supplied from these.

  Reference numeral 400 denotes a cleaning processing unit that stirs the mixed soil (oil-contaminated soil mixed with the oil adsorbent) in the cleaning liquid in the mixing processing unit 300, and separates the oil adsorbent that has adsorbed the oil in the soil. The processing unit 400 is configured to remove the oil adhering to the oil adsorbent by stirring the mixed soil in the cleaning liquid and separating the oil adhering to the oil adsorbent from the soil and supplying the oil adsorbed to the oil adsorbent. And a cleaning processing device 15 that extracts suspended water near the surface of the cleaning liquid including foreign matter, and a discharge unit 16 that discharges the clean soil generated by removing the oil in the cleaning processing device 15.

  500 removes foreign matters such as earth and sand particles and oil adsorbent and oil from suspension water containing oil adsorbent and oil discharged from the cleaning treatment device 15, purifies a clean cleaning liquid, and circulates it to the cleaning liquid supply device 18. The water treatment unit 500 is configured to dehydrate the suspended water to separate the oil adsorbent and foreign matter, and to remove residual oil from the cleaning liquid from which the oil adsorbent and foreign matter have been removed. And an oil / water separator 200 for separation.

FIG. 2 is a side view of a specific configuration example of one embodiment of the oil-contaminated soil treatment method system of the present invention. In FIG. 2, the same parts as those in FIG. Omitted. However, in FIG. 2, the mixing processing unit 300 and the cleaning processing unit 400 are illustrated, and the water processing unit 500 is not illustrated.
As shown in FIG. 2, in this embodiment, a mixing processing machine 300 is used as the mixing processing unit 300, and a cleaning processing machine is used as the cleaning processing unit 400, which are arranged in tandem. Then, the mixed soil produced by adding and mixing the oil adsorbent to the oil-contaminated soil by the mixing processing machine is supplied to the cleaning processing machine to be cleaned. However, in this example, the system is configured by arranging machines having a self-propelled function as described above, but may be a fixed machine. Of course, the system is not limited to the mixing processing machine and the cleaning processing machine in which the respective devices are configured in this way, and the main constituent devices shown in FIG. 1 may be prepared and appropriately arranged. In addition, the two are arranged in cascade so that the mixed soil is directly supplied from the mixing processing machine to the cleaning processing machine. However, when the mixed soil is once stocked or cured in another place, There is no need for a tandem arrangement.
Hereinafter, examples of specific configurations of the above-described mixing processing unit 300, cleaning processing unit 400, and water processing unit 500 will be sequentially described.

FIG. 3 is a side view showing the overall configuration of the mixing processing machine as the mixing processing unit 300. In FIG. 3, the same parts as those in the previous drawings are denoted by the same reference numerals and description thereof is omitted.
In FIG. 3, reference numeral 303 denotes the traveling body. The traveling body 303 includes a traveling body frame 304, a track frame 305 provided on each side of the traveling body frame 304, and one side of the track frame 305 (in FIG. 3). 3, a driven wheel 306 provided on the other side of the track frame 305 (the right side in FIG. 3), and a crawler belt 308 wound around the driven wheel 306 and the drive wheel 307. Has been.

  309 is a main body frame provided on the traveling body frame 304, 310 is a power unit provided on one side (right side in FIG. 3) of the main body frame 309 via a support member 311. The power unit 310 serves as a power source. An engine, a pump driven by the engine, and a valve for switching and supplying pressure oil from the pump to the traveling body and each device described later are provided. Reference numeral 312 denotes the mixing device provided in the longitudinal direction at the approximate center of the main body frame 309, and the configuration thereof will be described later.

  314 is a support frame provided on the other side of the main body frame 309 (left side in FIG. 3), 315 is a sieve device provided on the support frame 314 via a spring 316, and 317 is an eccentric body drive provided on the sieve device 315. A shaft 318 is a vibration hydraulic motor 319 and a belt 319 connects the vibration hydraulic motor 318 and the eccentric drive shaft 317.

  320 is a transport conveyor provided on the support base 314 so as to be positioned below the sieve device 315. The discharge side (right side in FIG. 3) of the transport conveyor 320 is an inlet 332 of the mixing device 312 (see FIG. 5 described later). It faces. Reference numeral 321 denotes the above-described hopper provided on the support frame 314 so as to be positioned between the sieving device 315 and the transfer conveyor 320.

  322 is the above-described oil adsorbent supply device supported by the column 323, and this oil adsorbent supply device 322 includes an oil adsorbent storage tank 313 configured in a bellows shape to adjust the height, And a supply unit 324 including a rotary feeder (or a screw feeder) provided at a lower portion of the storage tank 313. The supply unit 324 is located above the other side (the right side in FIG. 3) of the transport conveyor 320 and supplies oil adsorbent onto the earth and sand transported by the transport conveyor 320. In the present embodiment, the oil adsorbent is a substance having a specific gravity smaller than that of water, and sawdust, hydrocarbon polymer, waste paper cotton, polypropylene, or other fibrous materials (for example, plant fibers, etc. as the main component). ) Use one or a combination of multiple oil adsorbents.

  Reference numeral 327 denotes a discharge conveyor that conveys and discharges the mixed soil discharged from the outlet of the mixing device 312, and one side (left side in FIG. 3) of the discharge conveyor 327 is an outlet 333 of the mixing device 312 (described later, see FIG. 5). The other side (the right side in FIG. 3) is supported by the main body frame 309 and the like so as to have an upward inclination from below the power unit 310.

4 is a plan view showing the detailed structure of the mixing device 312. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4. In these figures, the same reference numerals are given to the same parts as in the previous drawings. The description is omitted.
4 and 5, a mixing device 312 includes a mixing device main body 330 formed of a rectangular container arranged in a substantially horizontal direction, and one side (left side in FIG. 4) and the other side (FIG. 4) of the mixing device main body 330. 4 on the right side in FIG. 4 and projecting on both sides in the width direction, provided on the upper surface of the main body frame 309 via bolts or the like, and provided on one upper side of the mixing apparatus main body 330. The inlet 332 for introducing the oil adsorbent from the supply unit 324 of the earth and sand and the oil adsorbent supply device 322, the outlet 333 provided at the lower part on the other side of the mixing device main body 330, and the mixing device main body 330 are provided substantially in parallel. A paddle mixer 334. In the present embodiment, two paddle mixers 334 are provided. However, at least one paddle mixer 334 is sufficient, and the number is not limited.

  The paddle mixer 334 includes a rotating shaft 335 and a plurality of blades (paddles) 336 provided intermittently as stirring / transfer members on the rotating shaft 335, and both ends of the rotating shaft 335 are rotatable by bearings 337 and 337, respectively. It is supported. The rear end portion of the rotation shaft 335 extends into a drive unit 338 provided at the rear end portion of the mixing apparatus main body 330. A transmission gear 339 is connected to the rear end of each rotating shaft 335, and both the transmission gears 339 and 339 mesh with each other. One transmission gear 339 (upper in FIG. 4) is connected to the output shaft of a driving device (mixing device hydraulic motor) 340. By rotating the mixing device hydraulic motor 340, both of them are driven. The rotary shafts 335 and 335 are driven to rotate simultaneously and in opposite directions.

  At this time, a large number of paddles 336 are installed on the outer peripheral surface of each rotating shaft 335 at a predetermined angle (for example, every 90 °) as shown in FIGS. 4 and 5. By rotating 335, the paddle 336 is rotationally driven, and the earth and sand and the oil adsorbent introduced into the mixing apparatus main body 330 are agitated and mixed uniformly, and then transferred toward the outlet 333 side. Yes. This transfer amount can be adjusted as appropriate by changing the angle and rotational speed of the paddle 336.

  As described above, the sand and the oil adsorbent introduced from the inlet 332 of the mixing apparatus main body 330 are uniformly stirred and mixed by the action of the paddle mixer 334 and transferred toward the outlet 333. Mixed soil is generated. And the mixed soil produced | generated in this way is discharged | emitted from the exit 333 on the discharge conveyor 327 by the effect | action of dead weight.

  The mixing device main body 330 is substantially hermetically sealed except for the inlet 332 and the outlet 333, but an open / close door 341 is provided on the side surface or the upper surface of the mixing device main body 330 for internal inspection and repair. It has been. This opening / closing door may be provided on the lower surface.

FIG. 6 is a side view showing the entire configuration of the cleaning processing machine as the cleaning processing unit 400 constituting one embodiment of the oil-contaminated soil processing system of the present invention. In this figure, the same parts as those in the previous drawings Are denoted by the same reference numerals and description thereof is omitted. In this cleaning processing machine, directions corresponding to the left and right in FIG. 6 are appropriately described as one and the other or the front-rear direction of the cleaning processing machine.
In FIG. 6, reference numeral 1 denotes a traveling body as traveling means that enables self-running. The traveling body 1 includes a track frame 2, driving wheels 3 and driven wheels 4 provided at both front and rear ends of the track frame 2. And a drive device (traveling hydraulic motor, which may be electric) 5 directly connected to the drive wheel 3 and a crawler belt (infinite track crawler) 6 wound around the drive wheel 3 and the driven wheel 4. However, in the present embodiment, it is assumed that soil (mixed soil) is intermittently charged by a hydraulic excavator or the like, and the vehicle body is prevented from becoming unstable due to an impact load or the like at the time of sediment loading. Therefore, the so-called crawler type traveling means provided with the footwear 6 has been taken as an example, but when the earth and sand are continuously added using the above-described mixing processing machine (see FIG. 3) or other conveyors, etc. In this case, a so-called wheel-type traveling means may be used.

  Reference numeral 7 denotes a main body frame for supporting various mechanisms and devices provided on the upper portion of the track frame 2. A support beam 10 is supported on one side in the longitudinal direction of the main body frame 7 via support posts 8 and 9. On the other side in the longitudinal direction, a plate-like support frame 13 is supported via support posts 11 and 12. Although the detailed structure of each will be described later, the supply unit 14 including the earth and sand supply unit 17 and the above-described cleaning liquid supply unit 18 is provided on one side in the longitudinal direction of the main body frame 7, and the above-described cleaning processing apparatus is provided at a substantially central portion. 15 is further provided with the discharge portion 16 described above from the lower position of the cleaning processing device 15 toward the rear.

The supply unit 14 includes the earth and sand supply unit 17 and a cleaning liquid supply unit 18. Here, the earth and sand supply part 17 is demonstrated first.
FIG. 7 is a side view showing the detailed structure of the earth and sand supply unit 17. In FIG. 7, the same parts as those in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 7, the earth and sand supply unit 17 includes a sieve device 19 that sorts the charged earth and sand according to the particle size, a hopper 20 as a receiving unit that receives the charged earth and sand sorted by the sieve device 19, It is comprised with the conveyance conveyor 21 as a conveyance means which conveys the earth and sand received in the hopper 20 to the washing | cleaning processing apparatus 15. FIG.

  The configuration of the sieving device 19 will be described. Reference numeral 22 denotes a support frame that forms the main body of the sieving device 19. The support frame 22 is attached to the bases 23 and 24 (see FIG. 6) provided on the support beam 10. 25, the main body frame 7 is supported so as to be able to vibrate, and is vibrated by a driving device (vibration device) (not shown). 26 is a lattice mounted in the support frame 22, and the earth and sand introduced into the sieving device 19 by, for example, a hydraulic excavator or the like is also subjected to the action of vibration, leading to a sediment component smaller than the eyes of the lattice 26 downward. Solid foreign matters larger than the eyes of the lattice 26, such as concrete, rock, or metal, are removed. The solid foreign matter remaining on the lattice 26 by this sorting moves forward along the inclination of the lattice 26 and falls. A chute 27 guides foreign matter.

  The hopper 20 will be described. The hopper 20 is formed by a frame having an upwardly expanding shape that is open at the top and bottom, and between the sieving device 19 and the upstream side (left side in FIG. 7) of the conveyor 21. It is supported from the main body frame 7 via the support beam 10 and the support posts 8 and 9 (see FIG. 6) so as to be positioned. The upper opening 28 of the hopper 20 is about the same as or slightly larger than the lower opening of the support frame 22 of the sieving device 19, and the width of the lower opening 29 is the same as the width of a conveyor belt 35 (described later) of the conveyor 21. The degree is slightly narrower than that. In addition, a sediment outlet (not shown) is provided in the downstream side wall 30 of the hopper 20 so as to face the conveyor belt 35.

  The conveyance conveyor 21 will be described. A conveyor frame 31 is a main body of the conveyance conveyor 21. The conveyor frame 31 is provided with the support posts 8 and 9 (see FIG. 6) and the beam 32 (see FIG. 6) provided on the support posts 8 and 9 (see FIG. 6) so as to be inclined upward toward the downstream side (right side in FIG. 7). And supported by the main body frame 7. Thereby, as shown in FIG. 6, as for the conveyance conveyor 21, the one end side is located under the hopper 20, and the other end side has faced the inlet 55 (after-mentioned, refer FIG. 6) of the said washing | cleaning processing apparatus 15. FIG.

  Reference numerals 33 and 34 denote driven wheels and driving wheels rotatably supported at both ends of the conveyor frame 31, respectively, and reference numeral 35 denotes a conveying belt wound around the driven wheels 33 and the driving wheels 34. Reference numeral 36 denotes a drive device for the transfer conveyor 21 (a transfer hydraulic motor, which may be electric). The drive device 36 is directly connected to the drive wheel 34 and is driven to rotate with the driven wheel 33 by rotating the drive wheel 34. The conveyor belt 35 is driven to circulate between the wheels 34. Reference numeral 37 denotes a plurality of support rollers that support the conveyance surface of the conveyance belt 35, and these support rollers 37 are arranged at predetermined intervals in the longitudinal direction of the conveyor frame 31 so as to contact the back side of the conveyance surface of the conveyance belt 35. Yes. With such a configuration, the conveyor 21 is configured so that the earth and sand placed on the conveyor belt 24 in the hopper 20 is cut out to the outside of the hopper 20 through the earth and sand outlet and introduced into the cleaning processing device 15. . Since the amount of earth and sand transported is determined by the opening area of the sand cutting exit of the hopper 20 and the transport speed of the transport belt 35, it can be adjusted by controlling the rotational speed of the transport driving device 36.

  Reference numeral 38 denotes a belt tension adjusting device having a known configuration. The belt tension adjusting device 38 adjusts the position of the driven wheel 33 in the front-rear direction of the conveyor frame 31 to adjust the tension of the transport belt 35. . Reference numeral 39 denotes a regulating plate that covers both sides in the width direction of the conveyor belt 35 in the downstream portion of the hopper 20, and the regulating plate 39 prevents the earth and sand conveyed toward the cleaning processing device 15 from spilling from the conveyor belt 35. It is preventing.

FIG. 8 is a side view showing the detailed structure of the cleaning liquid supply unit 18. In FIG. 8, the same parts as those in the previous drawings are denoted by the same reference numerals, and description thereof is omitted.
As shown in FIG. 8, the cleaning liquid supply unit 18 includes a cleaning liquid storage tank 40 and a supply unit 41 that supplies the cleaning liquid in the storage tank 40 to the cleaning processing device 15. Reference numeral 42 denotes a water supply port of the storage tank 40, and this water supply port 42 is connected to a drain port 203 (see FIG. 14) of an oil / water separator 200 described later via a pump (not shown).

  The supply unit 41 will be described. 44 is a pump for sending the cleaning liquid in the storage tank 40 to the cleaning processing device 15, 45 is a connection between the pump 44 and a drain port (not shown) provided on the bottom plate 46 of the storage tank 40. A suction pipe 47 is a water supply pipe connected to a discharge port (not shown) of the pump 44. The water supply pipe 47 is branched into two water spray pipes 49 via a joint 48. These water sprinkling pipes 49 are arranged at the upper part of both side surfaces of the processing tank 53 (described later) of the cleaning processing apparatus 15 in the width direction (the direction orthogonal to the paper surface in FIG. 8). Watering holes 50 are provided at a predetermined pitch. Reference numeral 51 denotes a support member provided on the main body frame 7, and the pump 44 is supported on the main body frame 7 via the support member 51. The pump 44 is of a known configuration (for example, a centrifugal pump), and the cleaning liquid from the suction pipe 45 is supplied to the water supply pipe 47 by a directly connected drive device (electric motor, etc.) 52. Further, the cleaning liquid is sprayed into the treatment tank 53 through the water spray tube 49 and the water spray hole 50.

9 is a side sectional view showing the detailed structure of the cleaning processing apparatus 15, FIG. 10 is a sectional view taken along the line XX in FIG. 9, and FIG. 11 is a sectional view taken along the line XI-XI in FIG. In the figure, the same reference numerals are given to the same parts as those in the previous drawings, and the description will be omitted.
In FIG. 9 to FIG. 11, reference numeral 53 denotes a processing tank constituting the main body of the cleaning processing apparatus 15, and this processing tank 53 is supported substantially horizontally on the center in the longitudinal direction of the main body frame 7 via a support member 54. 55 is provided in the upper part on the front side of the processing tank 53, and is an introduction port for introducing earth and sand from the conveyor 21. 56 is a discharge port 56 provided in the lower part on the rear side of the processing tank 53. Except for the introduction port 55 and the discharge port 56, it has a substantially sealed structure, and its lower side is formed in a substantially arc-shaped cross section along the rotation locus of a paddle mixer 58 (described later) (see FIG. 11).

  Further, on the side surface of the treatment tank 53, at least one drain port 53a is provided in the vicinity of the maximum water level position (（position in the figure) of the cleaning liquid, and floats near the water surface of the cleaning liquid in the processing tank 53. Suspended water containing foreign matter such as fine particles of earth and sand and oil adsorbent adsorbing oil is discharged outside the treatment tank 53 and introduced into the dehydrator 100. If this drain outlet 53a is higher than the position of the suspension water discharge destination (dehydration device 100), the suspension water can be drained by the action of gravity without using a discharge device. Needless to say, however, a drainage device such as a pump or a water pipe can be separately provided when it is desired to increase the discharge efficiency of the suspended water or when the flexibility of the device layout is desired. A water level sensor 57 is provided on the inner wall of the processing tank 53 and serves as a water level detecting means for detecting the water level of the cleaning liquid stored in the processing tank 53.

  58 is a paddle mixer provided in the processing tank 53 (two are provided in this example, but one or three or more may be provided). The paddle mixer 58 is arranged in the longitudinal direction of the processing tank 53 (left and right in FIG. 9). ) And a paddle (stirring blade) 61 fixed to each paddle seat 60 radially provided on the rotation shaft 59. In the present embodiment, the rotation shaft 59 is substantially parallel to 2 A book is provided. The paddle 61 is fixed to the paddle seat 60 with a bolt or the like, and is configured to be easily exchanged when worn or damaged. The length of the paddle 61 and the distance between the rotary shafts 59 and 59 are set such that the paddles 61 do not touch the counterpart rotary shaft 59 during rotation. Further, as shown in the figure, each paddle 61 is attached to be inclined at a predetermined angle with respect to the rotation direction, so that the paddle mixer 58 crushes and stirs the earth and sand in the treatment tank 53 and simultaneously discharges the discharge port 56. It plays the role of a stirring transfer means for transferring in the direction. The agitation transfer means is not particularly limited as long as it is capable of performing the agitation and transfer at the same time without using the paddle mixer 33. For example, the agitation transfer means can be constituted by a screw mixer, a ribbon mixer, or the like.

  A drive unit housing 62 is provided on the outer wall surface on the front side of the processing tank 53. A bearing 63 for rotatably supporting the vicinity of one end of the rotating shaft 59 is accommodated in the drive unit housing 62 and fixed. Yes. Reference numeral 64 denotes a bearing that rotatably supports the rear end portion of the rotary shaft 59, and the bearing 337 is fixed to the rear outer wall surface of the processing bath 53 via a support member 65. Reference numeral 66 denotes a drive device (hydraulic motor for mixing, which may be electric) that rotates the paddle mixer 58. The output shaft (not shown) of this drive device 66 has a coupling (not shown) at one end of the rotary shaft 59. Are connected through. At this time, the two paddle mixers 58, 58 partially overlap each other as shown in the figure, and the paddles 61 interfere with each other unless they are rotated in reverse at substantially the same number of rotations. In order to rotationally drive the paddle mixers 58 and 58 at substantially the same number of rotations, it is necessary to supply hydraulic oil having substantially the same flow rate to the drive devices 66 and 66. The transmission gears 67 and 67 provided in the first and second gears mesh with each other so that the two paddle mixers 58 and 58 are forced to reversely rotate at substantially the same rotational speed.

  Reference numeral 68 denotes a discharge valve that serves as a discharge door for preventing leakage of earth and sand from the treatment tank 53 to the discharge section 16. In this embodiment, the discharge valve 68 is constituted by a rotary valve. A discharge port 56 of the processing tank 53 and an inlet 76 (described later) of the discharge unit 16 are connected via 68. Although not particularly illustrated, the attachment portion of the discharge valve 68 with respect to the discharge port 56 of the processing tank 53 and the inlet 76 of the discharge portion 16 is sealed with packing or the like so that the cleaning liquid does not overflow to the outside. Thereby, the processing tank 53 and the discharge unit 16 are hermetically connected. Reference numeral 69 denotes a driving device (for example, an electric motor) of the discharge valve 68. By rotating the rotor 71 in the discharge valve 68 provided with a plurality of partition walls 70 radially by the driving device 69, the earth and sand in the processing tank 53 is obtained. Are discharged to the discharge section 16 by a substantially constant amount.

  As described above, the processing tank 53 has a substantially sealed structure except for the introduction port 55 and the discharge port 56. However, solid foreign matters mixed in the processing tank 53 due to some reason are caught, and the paddle mixer 58 is smooth. It cannot be said that there is no possibility of hindering proper operation. Furthermore, since the paddle 61 (described later) is worn out when used for a long period of time, it needs to be repaired or replaced as appropriate. From the above, a maintenance door (not shown) is provided on the upper surface of the processing tank 53 for the internal inspection or repair of the processing tank 53 and can be attached and detached by bolts or the like. A maintenance drain 72 is provided at the lower part of the front side wall surface of the treatment tank 53. For maintenance, for example, an on-off valve 73 using a ball valve or the like is operated to perform this maintenance drain. The opening 72 is opened, and the earth and sand (fine particles) in the treatment tank 53 and the suspended cleaning liquid can be positively discharged.

  With the above configuration, in the cleaning processing apparatus 15, the paddle mixer 58 is driven to rotate by the driving device 66, the mixed soil is stirred in the cleaning liquid, and the oil adsorbent that has adsorbed the oil is separated. Oil adsorbent that adsorbs oil and oil is suspended in the cleaning liquid and discharged from drainage port 53a together with suspended water containing them from the surface floating near the liquid surface. Then, clean soil and sand from which oil has been removed (clean soil) is transferred to the discharge side, and the discharge valve 68 is driven as appropriate so that the cleaned soil and sand is led to the discharge unit 16 through the discharge port 56. It has become.

FIG. 12 is a side view showing the detailed structure of the discharge unit 16. In FIG. 12, the same parts as those in the previous drawings are denoted by the same reference numerals, and description thereof is omitted.
As shown in FIG. 12, the discharge unit 16 is a discharge means for discharging the earth and sand discharged from the cleaning processing device 15 to the outside of the machine, and in this embodiment, a screw conveyor 74 is used. . 75 is a substantially cylindrical casing that forms the main body of the screw conveyor 74. As described above, a discharge valve 68 is provided at the discharge port 56 of the processing tank 53 on the upstream side (left side in FIG. 12) of the casing 75 in the transfer direction. An upward inlet 76 that is hermetically connected to the inside is provided, and a downward outlet 77 is provided on the downstream side (right side in FIG. 12). At this time, the casing 75 transfers the earth and sand from the lower position of the cleaning processing device 15 so that the height position of the outlet 77 is higher than the maximum water level (▽ position in the figure) of the cleaning liquid in the processing tank 53. It is arranged in an upward slope toward the direction (right direction in FIG. 12).

  Reference numerals 78 and 79 denote end brackets provided at both ends of the casing 75, and reference numerals 80 and 81 denote bearings attached to the end brackets 78 and 79 via support members 82 and 83, respectively. Reference numeral 84 denotes a hollow (may be solid) rotating shaft provided in the casing 75, and both ends of the rotating shaft 84 are rotatably supported by bearings 80 and 81. Reference numeral 85 denotes a screw (auger) spirally provided on the outer periphery of the rotating shaft 84. Reference numeral 86 denotes a drive device for the screw conveyor 74 (a discharge hydraulic motor, which may be electric), and this drive device 86 is supported by the end bracket 79 via the cylindrical support member 83. Reference numeral 87 denotes a coupling for connecting the output shaft of the drive device 86 and the rotary shaft 84 in the support member 83. Via this coupling 87, the driving force of the drive device 86 is transmitted to the rotary shaft 84, and the screw 85 is It is designed to rotate.

  With the above-described configuration, the screw conveyor 74 conveys only the earth and sand from the cleaning processing apparatus 15 that has been cleaned without dehydrating the cleaning liquid in the processing tank 53, and discharges it to the outside through the outlet 77. It has become.

  Returning to FIG. 6, reference numeral 88 denotes a power unit (power unit) of the cleaning processing machine, and this power unit 88 is supported on the other side in the longitudinal direction of the main body frame 7 through the support posts 11 and 12 and the support member 13. . The power unit 88 houses an engine serving as a power source, at least one hydraulic pump driven by the engine, and a plurality of control valves for switching and supplying hydraulic oil discharged from the hydraulic pump to each driving unit. ing. Although not particularly shown, a support member for suspending and supporting the casing 75 of the screw conveyor 74 is provided on the rear side of the power unit 88.

  Reference numeral 89 denotes a driver's seat which is a section on which an operator is boarded. The driver's seat 89 is provided in a region on the front side of the power unit 88 on the support member 13. Reference numeral 90 denotes an operating lever for driving operation arranged in the driver seat 89. By operating the operating lever 90, a control valve in the power unit 88 for switching and supplying hydraulic oil to the driving device for driving 5 is switched. The washing processing machine is operated to travel.

  91 is an operation panel for performing various settings and operations related to the operation of this system, and this operation panel 91 is directly supported on the other side in the longitudinal direction of the main body frame 7. Inside this operation panel 91, detection signals from sensors provided in various parts of the cleaning processing machine and operation signals corresponding to operations from the operation panel 91 are input, and each hydraulic drive except the driving device 5 for traveling is input. A control device (not shown) that outputs a command signal corresponding to an input signal to a control valve corresponding to the device or other electric drive device is provided.

FIG. 13 is a cross-sectional view showing a schematic configuration of a dehydrating apparatus 100 constituting an embodiment of the oil-contaminated soil treatment system of the present invention. In FIG. The description is omitted.
In FIG. 13, reference numeral 101 denotes a housing, and reference numeral 102 denotes a rotating cylinder provided so as to be rotatable relative to the housing 101. The rotating cylinder 102 is formed in a hollow shape, and includes a rotating shaft portion 103 at both ends thereof and a casing portion 104 positioned in the housing 101. The rotating shaft 103 is supported by a bearing 105, and the rotating cylinder 102 is rotated by a driving force from a driving device (not shown) transmitted to a V pulley 106 provided at the tip of the rotating shaft 103. The casing part 104 is reduced in diameter as it goes from one side in the longitudinal direction to the other side. In addition, a cleaning liquid drainage groove 107 formed at a predetermined distance from the outer peripheral portion is formed on one end surface of the casing portion 104 in the longitudinal direction, and an oil adsorbent that has adsorbed oil is formed on the other outer peripheral portion. A discharge groove 108 for foreign matters such as earth and sand fine particles is opened.

  Reference numeral 109 denotes a rotary shaft provided rotatably in the rotary cylinder 102. The rotary shaft 109 is supported by a frame 110 fixed to the housing 101 via a bearing (not shown). The rotating shaft 109 is directly connected to a driving device 111 fixed to a separately provided frame, and is rotated by the driving force of the driving device 111. Reference numeral 112 denotes a screw (auger) provided on the outer peripheral portion of the rotating shaft 109. The screw 112 is covered with the casing portion 102, and the other side in the longitudinal direction according to the shape of the casing portion 102 (in FIG. 13). The outer diameter decreases as you go to the right. At this time, a pipe 113 for introducing suspended water inserted from the other side in the longitudinal direction (right side in FIG. 13) is provided inside the rotary shaft 109, and the suspension water is discharged from the pipe 113 in the rotary shaft 109. A suspension water introduction groove (not shown) is provided on the outer periphery near the end.

  With such a configuration, the suspended water from the drain port 53a of the cleaning apparatus 15 is introduced into the casing part 104 through the pipe 113 and is transferred to the reduced diameter side of the casing part 104 by the rotating screw 112. Compressed and separated into solid components such as oil adsorbent and foreign matter and moisture such as cleaning liquid (solid-liquid separation). At the same time, due to the action of centrifugal force by the rotating casing portion 104, highly fluid water (cleaning liquid) moves to the diameter expansion side (left side in FIG. 13) along the inclination of the inner wall surface of the casing portion 104. When the water level reaches a predetermined level from the inner diameter portion of the casing portion 104, the water is drained out of the casing portion 104 through the drainage groove 107. On the other hand, the solid content (oil adsorbent, fine sediment particles, etc.) is transferred by the screw 112, moves to the reduced diameter side, and is discharged from the discharge groove 108. Then, the cleaning liquid and the solid content discharged to the outside of the casing portion 104 are connected to the outside through the discharge ports 114 and 115 provided in the lower portion of the housing 101 so as to be positioned below the drainage groove 107 and the discharge groove 108, respectively. It is supposed to be discharged.

FIG. 14 is a cross-sectional view showing a schematic configuration of an oil / water separator 200 constituting an embodiment of the oil-contaminated soil treatment system of the present invention. In FIG. The description is omitted.
In FIG. 14, reference numeral 201 denotes a substantially box-shaped main body. A discharge port 202 for discharging oil is provided at the upper part of the side surface of the main body 201, a drain port 203 for discharging cleaning liquid is provided at the lower part of the side surface, and the dehydrator is provided at the bottom. A water supply port 204 for introducing the cleaning liquid discharged from the 100 drain ports 114 is provided. Reference numeral 205 denotes a filter. By passing the cleaning liquid supplied from the water supply port 204 through the filter 205, a solid content slightly remaining in the cleaning liquid that cannot be completely removed by the dehydrator 100 is separated. The oil in the cleaning liquid floats up in the cleaning liquid filled in the main body 201, and this floating oil is discharged through the discharge port 202. The clean cleaning liquid thus separated from the oil is drained through the drain port 203, returned to the storage tank 40 of the cleaning liquid supply unit 18 described above by a pump (not shown), and circulated and supplied to the cleaning processing unit 15 again. The

Next, the operation and action of the cleaning processing machine of the present embodiment having the above configuration will be described.
For example, when oil-contaminated soil contaminated with oil is excavated by a hydraulic excavator or the like and put into the hopper 321 of the mixing processing unit (mixing processing machine) 300, the earth and sand are transported out of the hopper 321 by the transporting conveyor 320 by the mixing device 312. In the middle of the conveyance, the oil adsorbent is added by the oil adsorbent supply device 322 at an appropriate addition rate. Then, when the earth and sand and the oil adsorbent are supplied to the mixing device 312 by the transport conveyor 320, the earth and sand are uniformly stirred and mixed together with the oil adsorbent by the paddle mixer 324, whereby the oil in the earth and sand adheres to the oil adsorbent. . The oil adsorbent and soil mixed soil are transferred by the paddle mixer 324 while the oil is adsorbed on the oil adsorbent, and discharged through the outlet 333. The discharged mixed soil is supplied to the cleaning processing machine by the discharge conveyor 327. In addition, when stocking to another place for the purpose of curing, etc., it is not supplied directly to the cleaning processing machine, but discharged to a predetermined accumulation position, cured for a predetermined period, and the oil is sufficiently adsorbed by the oil adsorbent. After that, for example, it is supplied to the cleaning processing machine by a hydraulic excavator or the like.

  When the earth and sand mixed with the oil adsorbent, that is, the mixed earth is introduced into the cleaning processing unit (cleaning processing machine) 400, the introduced earth and sand is larger than the mesh 26 due to the vertical vibration of the sieve device 19. Foreign matters and the like are removed, and sediment components smaller than the eyes of the lattice 26 are temporarily stored in the hopper 20. The mixed soil placed on the conveyor belt 35 of the conveyor 21 in the hopper 20 is cut out of the hopper 20 by the conveyor belt 35 that is circulated and supplied to the cleaning processing device 15 (processing tank 53).

  A predetermined amount of cleaning liquid is supplied from the cleaning liquid supply unit 18 into the processing tank 53, and the mixed soil is stirred and cleaned in the cleaning liquid by the paddle mixer 58. If the paddle mixer 58 is appropriately reversed, a higher cleaning effect can be obtained. The clean soil (clean soil) cleaned in the processing tank 53 is transferred to the discharge port 56 side, led out into the screw conveyor 74 through the discharge valve 68, and discharged while being dehydrated by the screw conveyor 74. The

  At this time, as described above, since the oil adsorbent is made of a material having a lighter specific gravity than water, such as sawdust, the oil adsorbent that has adsorbed the oil is separated from the sand and floated in the cleaning liquid, Ascend near the surface. Although it may be the case that the oil component that has not been adsorbed by the oil adsorbent is separated from the earth and sand for the first time by washing, generally the oil component is not adsorbed by the oil adsorbent because the specific gravity is less than that of water. In the same manner, the surface floats on the cleaning liquid surface. Further, in the processing tank 53, foreign matters including coarse particles of earth and sand having a high contamination concentration due to stirring and washing by the paddle mixer 58 also float in a suspended state in the cleaning liquid. However, since the processing tank 53 and the screw conveyor 74 are hermetically connected, and the outlet 77 of the screw conveyor 74 is provided at a position higher than the water level of the cleaning liquid, the cleaning liquid leaks out of the processing tank 53. The only thing that is discharged out of the machine by the screw conveyor 74 is the coarse particles of earth and sand that have been washed to a sufficient level. Accordingly, the oil adsorbent adsorbing the oil component floating in the processing tank 53 and the foreign matter of fine particles having a high contamination concentration are extracted outside the processing tank 53 through the discharge port 53a provided on the side of the processing tank 53. Discharged.

  Suspended water discharged from the treatment tank 53 is introduced into the casing portion 104 of the dehydrator 100 through the pipe 113. Then, it is squeezed in the casing portion 104 as described above, and is solid-liquid into solid content (oil adsorbent containing a large amount of oil, fine particles of earth and sand, and other foreign matters) and cleaning liquid separated from the solid content. The separated solid content such as the oil adsorbent is discharged from the dehydrator 100 through the discharge groove 108 and the discharge port 115. The solid content thus discharged is, for example, incinerated or carried out to a final disposal site or the like.

  On the other hand, the cleaning liquid separated from the solid content is discharged from the dehydrating device 100 through the drainage groove 107 and the discharge port 114, and introduced into the oil / water separation device 200 through the water supply port 204. As described above, separation (oil-water separation) is performed here. The separated oil is discharged through the discharge port 202, and then recovered and subjected to a predetermined treatment such as distillation and then reused. On the other hand, the clean cleaning liquid separated from the oil is drained through the drain port 203 and circulated to the storage tank 40 of the cleaning liquid supply unit 18 by a pump (not shown).

  In addition, in the processing tank 53 of the cleaning processing apparatus 15, assuming that the cleaning liquid deteriorates due to an increase in floating amount of sediment fine particles as the processing progresses, the cleaning liquid in the processing tank 53 is periodically replaced. There is a need. When replacing the cleaning liquid, the ball valve 73 is opened and the drain port 72 is opened to drain the cleaning liquid in the processing tank 53. At this time, for example, it is more preferable to connect the drain outlet 72 to a separately provided sewage tank. In this case, the cleaning liquid can be extracted without secondarily contaminating the surrounding soil. Further, it is more preferable that the cleaning liquid remaining in the treatment tank 53 after discharging the clean soil is appropriately transferred to the dehydrating apparatus 100 via a drainage means provided separately or the ball valve 73 when the cleaning liquid is replaced. .

  In general, in order to clean contaminated soil, the processing conditions such as the type of cleaning liquid, stirring speed, and cleaning time are examined in advance depending on the state of the contaminated soil, and the processing conditions suitable for the contaminated soil to be treated are determined. It is necessary to select. When the contaminated soil to be treated can be cleaned relatively easily depending on the degree of contamination and the nature of the earth and sand, the water level of the cleaning liquid in the processing tank 53 is appropriately controlled by operating the operation panel or the like and operating the pump 44 appropriately. Supplying the contaminated soil by sequentially feeding the sand and sand while driving the screw conveyor 74, the discharge valve 68, the paddle mixer 58, the transport conveyor 21, and the sieve device 19 while maintaining the soil at a sufficient level. The cleaning process and the discharge of the clean soil are sequentially performed, and a continuous process can be performed. Of course, batch processing is also possible.

  As described above, according to the present embodiment, the oil component in the oil-contaminated soil is previously adsorbed to the oil adsorbent having a specific gravity smaller than that of water, and the oil adsorbent that has adsorbed the oil component in the cleaning liquid is then washed. It can be floated and easily separated and removed from the earth and sand, oil can be removed from the oil-contaminated earth with high accuracy and efficiency, and a clean earth and sand can be obtained.

  Moreover, since the washing process for separating oil from the earth and sand and the classification process for discharging the separated oil can be performed at the same time by the washing apparatus 15, the oil-contaminated soil can be efficiently treated with such a simple structure. be able to. Furthermore, as shown in FIG. 2, if the system is configured using a soil quality improvement machine and a washing processing machine, a large amount of oil-contaminated soil can be processed at high speed.

  Further, by using the paddle mixer 58 in the cleaning processing device 15, a sufficient cleaning processing effect can be obtained as compared with the conventional case. That is, since the paddle mixer 58 is stirred so as to break up the earth and sand by the paddle 61, a frictional force effectively acts on the earth and sand between the paddle 61 and the paddle 61 and the inner wall of the treatment tank 53. The oil can be effectively separated. In addition, in the cleaning liquid, foreign substances such as oil adsorbent separated from the earth and sand and fine particles having a high contamination concentration are lifted up and floated by the paddle 61, so that these oil adsorbent and foreign substances are discharged from the outlet 53a. It is discharged smoothly through. Therefore, for example, the cleaning effect is greatly improved as compared with the case where a screw mixer or the like with an emphasis on the transfer action is used.

  In addition, the relationship between the rotational speed of the paddle mixer 58 and the levitation force acting on the fine sediment particles in the cleaning liquid is stored in the controller in advance, and the paddle mixer 58 is driven according to the fine particle size to be discharged. By controlling the speed, it is also possible to adjust the particle size such as fine particles of earth and sand that floats near the liquid surface of the cleaning liquid. Thereby, the particle size of the earth and sand discharged as clean soil, that is, the purification level can be controlled, and a desired clean soil can be obtained.

  In particular, in the present embodiment, since the earth and sand supply unit 17, the cleaning liquid supply unit 18, the cleaning processing device 15, and the discharge unit 16 are collectively arranged on the main body frame 7, a cleaning processing machine is configured. A cleaning treatment facility that is a type of facility can be mounted on the traveling body 1. As a result, the self-propelled mixing processing machine shown in FIG. 3 and the like can be driven by itself in the operation site, and even if a sufficient installation space cannot be secured, depending on the progress of the work in the excavation site. It is also possible to work while changing the layout to some extent, and the working efficiency can be greatly improved.

  In batch processing, the discharge valve 68 and the screw conveyor 74 are driven in conjunction with each other by, for example, a control device, so that the drive of the screw conveyor 74 is limited only to discharging soil from the processing tank 53. And energy efficiency during processing can be improved.

  In the above description, the example in which the sieving device 315 is provided on the hopper 321 of the mixing processing unit (mixing processing machine) 300 has been described. However, the sieving device 315 may be omitted if not necessary. It doesn't matter. The same applies to the cleaning processing unit (cleaning processing machine) 400. Further, as the mixing device 312 of the mixing processing unit 300, a so-called mixing-type mixing device using a paddle mixer 334 has been taken as an example, but for example, a so-called crushing-type mixing device having a rotating hammer that rotates at high speed, or a screw mixer. Also, other types of mixing devices such as a mixer using a ribbon screw may be used. In these cases, similar effects can be obtained.

  Moreover, although the structure which provided the discharge valve 68 between the washing | cleaning processing apparatus 15 and the discharge part 16 of the washing | cleaning processing part (cleaning process machine) 400 was illustrated and demonstrated, for example, earth and sand which are not fully washed are washed. Even if it flows into the screw conveyor 74 from the processing device 15 somewhat, if it does not cause a problem in terms of quantity, it is not always necessary to provide the discharge valve 68. Further, the screw conveyor 74 has been described as an example of the earth and sand discharging means after the treatment, but the point is that the earth and sand can be hermetically connected to the discharge port 56 of the treatment tank 53 so that there is no leakage of the earth and sand from the treatment tank 53, and the cleaning liquid. There is no particular limitation on the mode of the discharging means as long as the high-moisture content earth and sand stirred therein can be carried out. Therefore, for example, a so-called bucket conveyor or a pressure pump can be applied. In this case, the same effect can be obtained.

It is a block diagram showing the schematic structure of one Embodiment of the oil-contaminated soil processing method system of this invention. It is a side view of one concrete example of composition of one embodiment of an oil-contaminated soil processing method system of the present invention. It is a side view showing the whole structure of the mixing processing machine as a mixing processing part which comprises one Embodiment of the oil-contaminated soil processing method system of this invention. It is a top view showing the detailed structure of the mixing apparatus with which one Embodiment of the oil-contaminated soil processing method system of this invention was equipped. It is sectional drawing by the VV cross section in FIG. 4 showing the detailed structure of the mixing apparatus with which one Embodiment of the oil-contaminated soil processing method system of this invention was equipped. It is a side view showing the whole structure of the washing processing machine as a washing process part which comprises one embodiment of the oil-contaminated soil processing system of this invention. It is a side view showing the detailed structure of the earth and sand supply part with which the washing processing machine which comprises one embodiment of the oil-contaminated soil processing system of this invention was equipped. It is a side view showing the detailed structure of the washing | cleaning liquid supply part with which one Embodiment of the oil-contaminated soil processing system of this invention was equipped. It is a sectional side view showing the detailed structure of the washing | cleaning processing apparatus with which one Embodiment of the oil-contaminated soil processing system of this invention was equipped. It is sectional drawing by the XX cross section in FIG. 9 showing the detailed structure of the washing | cleaning processing apparatus with which one Embodiment of the oil-contaminated soil processing system of this invention was equipped. It is sectional drawing by the XI-XI cross section in FIG. 9 showing the detailed structure of the washing | cleaning processing apparatus with which one Embodiment of the oil-contaminated soil processing system of this invention was equipped. It is a side view showing the detailed structure of the discharge part with which one Embodiment of the oil-contaminated soil processing system of this invention was equipped. It is sectional drawing showing schematic structure of the spin-drying | dehydration apparatus which comprises one Embodiment of the oil-contaminated soil processing system of this invention. It is sectional drawing showing the schematic structure of the oil-water separator which comprises one Embodiment of the oil-contaminated soil processing system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 Cleaning processing apparatus 18 Cleaning liquid supply part 100 Dehydration apparatus 200 Oil-water separation apparatus 312 Mixing apparatus 321 Hopper 322 Oil adsorbent supply apparatus

Claims (9)

Adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering the oil in the sand to the oil adsorbent;
A method for treating soil with soil contaminated with oil, comprising: washing the soil mixed with the oil adsorbent, and separating the oil adhering to the oil adsorbent from the soil. Adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering the oil in the sand to the oil adsorbent;
A step of stirring the earth and sand mixed with the oil adsorbent in the cleaning liquid to separate the oil adhering to the oil adsorbent from the earth and sand, and removing the oil floating on the surface adhering to the oil adsorbent. Oil-contaminated soil treatment method. Adding an oil adsorbent to the soil contaminated with oil, stirring and mixing, and adhering the oil in the sand to the oil adsorbent;
The soil admixed with the oil adsorbent is stirred in the cleaning liquid to separate the oil adhering to the oil adsorbent from the earth and sand, and the suspended water near the surface of the cleaning liquid containing the oil and foreign matter floating on the oil adsorbent is removed. An oil-contaminated soil treatment method comprising: a step of sampling.   The oil-contaminated soil treatment method according to any one of claims 1 to 3, wherein the oil adsorbent is a substance having a specific gravity smaller than that of water.   The oil-contaminated soil treatment method according to any one of claims 1 to 4, wherein the oil adsorbent is at least one of sawdust, hydrocarbon polymer, waste paper cotton, and polypropylene. A mixing device that accepts soil contaminated with oil, stirs and mixes the received soil with an oil adsorbent, and adheres oil in the sand to the oil adsorbent;
An oil-contaminated soil treatment system comprising: a washing treatment device that stirs soil and sand mixed with an oil adsorbent in a washing liquid and separates oil adhering to the oil adsorbent from the earth and floats in the washing liquid. A hopper that accepts soil contaminated with oil,
An oil adsorbent supply device for supplying the oil adsorbent;
A mixing device that stirs and mixes the earth and sand received in the hopper together with the oil adsorbent supplied from the oil adsorbent supply device, and adheres oil in the sand to the oil adsorbent;
A cleaning liquid supply unit for supplying the cleaning liquid;
A cleaning treatment device that stirs the earth and sand mixed with the oil adsorbent in the cleaning liquid supplied from the cleaning liquid supply unit and separates the oil adhering to the oil adsorbent from the earth and floats in the cleaning liquid. A featured oil-contaminated soil treatment system.   The oil-contaminated soil treatment system according to claim 6 or 7, further comprising a dewatering device that separates floating solids from the suspended water discharged from the washing treatment device.   9. The oil-contaminated soil treatment system according to claim 8, further comprising an oil / water separator that removes residual oil from the washing liquid from which the solid content has been removed by the dewatering device and circulates the oil in the washing treatment device.

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