JP2006026454A - Apparatus, system and method for treating contaminated soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus, a system and a method for cleaning contaminated soil efficiently. <P>SOLUTION: This apparatus for cleaning contaminant-containing contaminated soil is provided with: a contaminant exfoliation-functional part for exfoliating a contaminant from contaminated soil particles by driving a paddle mixer 58 at such a rotational speed that the contaminant can be exfoliated from contaminated soil particles in a small diameter section 53a of a treatment tank 53 which is filled with a cleaning liquid to such a first level that contaminated soil can be slurried; and a contaminant separation-functional part for separating the contaminant, which is exfoliated from contaminated soil particles and still exists in a gap among contaminated soil particles, from contaminated soil by driving the paddle mixer 58 at such a rotational speed that the contaminant exfoliated in the contaminant exfoliation-functional part can be separated from contaminated soil in a large diameter section 53b of the treatment tank 53 which is filled with the cleaning liquid to a second level higher than the first level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to soil and sand containing oil, particularly petroleum oils having a small specific gravity, that is, a contaminated soil treatment apparatus, a contaminated soil treatment system, and a contaminated soil treatment method for cleaning oil-contaminated soil.

  In recent years, along with the redevelopment of factory sites, problems of soil contamination due to heavy metals, volatile organic compounds, and specific hazardous substances such as petroleum-based oils have become apparent. The establishment of countermeasures was strongly requested by society, and in February 2003, the Soil Contamination Countermeasures Law was enforced. This soil pollution control law obliges land surveys when abolishing facilities that use hazardous substances, and even for facilities that are in use, it is possible to order surveys for land that may cause health damage due to soil contamination. . As a result of the survey, the land where contamination is found is listed as a contaminated area in the designated area register, and the landowner must take necessary countermeasures.

  Countermeasures stipulated in the Soil Contamination Countermeasures Law include, in addition to removing pollutants, containment to prevent the diffusion of pollution and insolubilization to prevent the pollutants from eluting into groundwater. However, in order to be deleted from the designated area ledger, pollutants must be removed. At present, the process of removing pollutants is becoming a social trend.

  Therefore, as an example of removing contaminants, for example, the contaminated soil is washed by putting the contaminated soil into a treatment tank storing the cleaning solution, stirring and transferring it with a screw conveyor, and transferring the contaminant from the soil into the cleaning solution. A purification apparatus for processing has been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-147086

  However, the screw conveyor mainly has a transfer function, and there is a possibility that the soil agitation function cannot be obtained sufficiently and the washing process cannot be sufficiently performed in the above-described conventional technology. If the driving speed of the screw conveyor is increased in order to obtain a sufficient cleaning effect, the contaminated soil will rise in the cleaning liquid. In this case, the contaminated soil soared is simply floating in the cleaning solution, and there is not enough opportunity to rub against the screw, other contaminated soil particles, or the inner wall of the treatment tank. There is a risk of being discharged without being sufficiently separated.

  The present invention has been made in view of the above, and an object thereof is to provide a contaminated soil treatment apparatus, a contaminated soil treatment system, and a contaminated soil treatment method capable of efficiently cleaning contaminated soil. .

  In order to achieve the above object, a first invention is a contaminated soil treatment apparatus for washing contaminated soil containing a pollutant, and a treatment tank having a first water level cleaning solution that is slurried for contaminated soil. The pollutant peeling function part having a stirring means for peeling the pollutant from the contaminated soil, and the pollutant peeling function part in a treatment tank containing a cleaning liquid having a second water level higher than the first water level. And a pollutant separation function part having a stirring means for separating the pollutant existing in the gap of the contaminated soil from the contaminated soil.

  A second invention is characterized in that, in the first invention, the pollutant peeling function section and the processing tank of the pollutant separation function section are connected.

  A third invention is characterized in that, in the first invention, the processing tanks of the pollutant peeling function part and the pollutant separation function part are independent of each other.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the agitation unit of the contaminant removing function unit and the agitation unit of the contaminant separation function unit are paddle mixers, and the paddle mixer of the contaminant release function unit The inclination angle of the paddle is set such that the transfer ability of the contaminated soil is suppressed and the stirring ability is improved with respect to the inclination angle of the paddle of the paddle mixer of the pollutant separation function section.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the agitation unit of the contaminant removing function unit and the agitation unit of the contaminant separation function unit are independent paddle mixers, and the contaminant release function The paddle mixer of the part rotates at a higher speed than the paddle mixer of the contaminant separation function part.

  A sixth invention is characterized in that, in any one of the first to fifth inventions, the treatment tank of the pollutant peeling function part is formed so that an inner wall thereof follows a rotation locus of the stirring means. To do.

  The seventh invention is a polluted soil treatment system for washing polluted soil containing pollutants, in a treatment tank containing a first water level cleaning solution to the extent that the contaminated soil is slurried. Peeling with the contaminated soil treatment apparatus in a contaminated soil treatment apparatus provided with a pollutant removal function part having a stirring means for peeling water and a treatment tank containing a cleaning liquid having a second water level higher than the first water level And a contaminated soil treatment apparatus provided with a contaminant separating function unit having a stirring means for separating the contaminant present in the gap of the contaminated soil from the contaminated soil.

  In an eighth aspect of the present invention, there is provided a contaminated soil treatment method for washing contaminated soil containing a contaminant, wherein the pollutant is contaminated from the contaminated soil in a treatment tank containing a first level water level cleaning solution that causes the contaminated soil to become a slurry. And a step of separating the pollutant that has been peeled off and present in the gap between the contaminated soils from the contaminated soil in a treatment tank containing a cleaning liquid having a second water level higher than the first water level. It is characterized by having.

  According to the present invention, the contaminated soil is agitated in the cleaning liquid at the first water level to the extent that the contaminated soil is slurried, so that the contaminated soil particles rise up regardless of the rotation speed of the agitating means and are simply suspended in the cleaning liquid. The contaminated soil can be washed effectively and the pollutants can be peeled off effectively. Also, the pollutant separation function part in the latter stage separates the polluted substances separated from the contaminated soil by stirring so that the soil particles do not rise in the cleaning liquid at the second water level higher than the first water level. It is possible to float near the cleaning liquid surface. Therefore, the contaminated soil can be efficiently cleaned.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a contaminated soil treatment system and treatment method according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an overall configuration of an embodiment of a contaminated soil treatment apparatus of the present invention. In the following description, directions corresponding to left and right in FIG. 1 are described as one / the other or before / after the contaminated soil treatment apparatus.
In FIG. 1, reference numeral 1 denotes a traveling body as traveling means that enables self-running. The traveling body 1 includes a track frame 2, drive wheels 3 and driven wheels 4 provided at both front and rear ends of the track frame 2. A driving device (traveling hydraulic motor, which may be electrically driven) 5 directly connected to the driving wheel 3 and a crawler belt (infinite track crawler) 6 wound around the driving wheel 3 and the driven wheel 4 are configured. However, in the present embodiment, it is assumed that the contaminated soil is intermittently charged by a hydraulic excavator or the like, and in order to prevent the vehicle body from becoming unstable due to an impact load at the time of earth and sand injection, etc. The crawler type traveling means provided with the crawler belt 6 is taken as an example. However, for example, when earth and sand are continuously charged using a conveyor or the like, the so-called wheel type traveling means may be used instead. good. In the present embodiment, a pollutant peeling function section and a pollutant separation function section, which will be described later, are disposed on one traveling body 1.

  Reference numeral 7 denotes a main body frame for supporting various mechanisms and devices provided on the upper part 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, a contaminated soil and cleaning liquid supply unit 14 is provided on one side in the longitudinal direction of the main body frame 7, a processing mechanism unit 15 is provided at a substantially central portion, and a position below the processing machine 15. A discharge part 16 is provided from the rear toward the rear.

  The supply unit 14 includes a sediment supply unit 17 that supplies the introduced sediment to the processing machine 15 and a cleaning liquid supply unit 18 as a cleaning liquid supply unit that supplies a cleaning liquid to the processing machine 15. Here, the earth and sand supply part 17 is demonstrated first.

FIG. 2 is a front view showing a detailed structure of the earth and sand supply unit 17 provided in the contaminated soil treatment apparatus of the present embodiment. In FIG. 2, the same parts as those in FIG.
As shown in FIG. 2, 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 processing machine 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, and the support frame 22 is provided on the bases 23 and 24 (see FIG. 1) is supported so as to be able to vibrate with respect to the main body frame 7, 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 body having an upwardly expanding shape that is open at the top and bottom. Between the sieving device 19 and the upstream side (left side in FIG. 2) of the conveyor 21. It is supported by the main body frame 7 through the support beam 10 and the support posts 8 and 9 (see FIG. 1) 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. On the downstream side wall 30 of the hopper 20, an earth and sand outlet (not shown) is provided by being cut away from the conveyor belt 35.

  The transport conveyor 21 will be described. First, reference numeral 31 denotes a conveyor frame that forms the main body of the transport conveyor 21. The conveyor frame 31 is inclined upwardly toward the downstream side (right side in FIG. 2) via the support posts 8 and 9 (see FIG. 1) and the beam 32 (see FIG. 1) provided thereon. It is supported from the main body frame 7. Thereby, as shown in FIG. 1, as for the conveyance conveyor 21, the one end side is located under the hopper 20, and the other end side faces the inlet 55 (after-mentioned, refer FIG. 1) of the said processor 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 to introduce the earth and sand placed on the conveyor belt 35 in the hopper 20 to the outside of the hopper 20 through the earth and sand cutting outlet. 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.

  A 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 conveyor 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. This regulating plate 39 prevents earth and sand conveyed toward the processor 15 from spilling from the conveyor belt 35. Yes.

3 is a front view showing a detailed structure of the cleaning liquid supply unit 18 provided in the contaminated soil treatment apparatus of the present embodiment, FIG. 4 is a plan view thereof, and FIG. 5 is a front view showing details of the liquid tank. 3, 4, and 5, parts similar to those in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.
As shown in FIGS. 3 to 5, the cleaning liquid supply unit 18 includes a cleaning liquid tank 40 and a liquid supply unit 41 that supplies the cleaning liquid in the liquid tank 40 to the processor 15.

  The liquid tank 40 is provided at a position below the earth and sand supply unit 17 and is directly supported on one side in the longitudinal direction of the main body frame 7 so as to be easily supplied by, for example, a tank truck. 42 is a water supply port of the liquid tank 40, and 43 is a cap of the water supply port 42. When storing the cleaning liquid in the liquid tank 40, the cap 43 is removed and the cleaning liquid is replenished via the water supply port 42. The upper surface portion of the liquid tank 40 includes a top plate 400 and a maintenance upper door (not shown), and the upper door is fixed with bolts or the like.

  An inflow conduit 401 through which the cleaning liquid in the processor 15 flows into the liquid tank 40 is provided at the upper part of the liquid tank 40, and a plurality of liquid pipes located slightly below the cleaning liquid level provided in the processing tank 53 described later. The cleaning liquid in the processing tank 53 is sucked by the liquid suction part 403 and supplied into the liquid tank 40 through the strainer 402 (see FIG. 4). The liquid suction unit 403 is constituted by a centrifugal pump, and may be the same as the centrifugal pumps 44 and 419 described later. Further, an impeller-type flow meter 404 and a water stop valve 405 are provided in the middle of the inflow conduit 401. By detecting the flow rate of the cleaning liquid supplied by the flow meter 404, the supply amount of the flocculant described later is determined. On the other hand, the cleaning water to be supplied can be stopped by the water stop valve 405, and the maintenance in the liquid tank 40 can be performed from the maintenance upper door. Although not particularly shown, a small window is provided on the side surface of the liquid tank 40 so that the inside of the liquid tank 40 can be monitored.

  In the present embodiment, a centrifugal pump is used as means for supplying the cleaning liquid from the processing tank 15 to the liquid tank 40. However, a difference in water level between the cleaning liquid level in the processing tank 15 and the liquid tank 40 may be used. .

  The bottom plate 46 of the liquid tank 40 has a substantially quadrangular pyramid shape, and solids in the liquid tank 40 are collected in a collection case 407 via a cylindrical body 406 attached to the top of the bottom plate 46. . The upper surface of the recovery case 407 has a flange shape, and is fastened with bolts via a flange 408 attached to the cylindrical body 406 and a seal (not shown).

  Further, a butterfly valve 409 is provided in the cylindrical body 406 so that water can be stopped between the cylindrical body 406 and the recovery case 407. The butterfly valve 409 rotates the handle shaft by the handle 410, and the rotational force decelerated by the worm gear unit (not shown) opens and closes the valve body of the butterfly valve 409 via the valve shaft 411. The recovery case 407 is provided with a ball valve 412 so that the cleaning liquid in the liquid tank and the recovery case can be discharged out of the apparatus.

  A stirring device 413 is provided in the liquid tank 40. The stirring device 413 functions to stir a flocculant and a cleaning liquid, which will be described later, to aggregate and precipitate fine particles in the cleaning liquid. The stirring device 413 includes a stirring blade 414 and a rotating shaft 415, and the rotating shaft 415 is rotatably held by a bearing (not shown) provided on the top plate 400. A stirring drive device 416 for driving the stirring device 413 is fixed on the top plate 400 via a bracket 417 and is directly connected to the upper end portion of the rotating shaft 415 of the stirring device 413.

FIG.6 and FIG.7 is the side view and top view showing the structure of the oil collection | recovery apparatus with which the contaminated soil processing apparatus of this Embodiment was equipped.
6 and 7, the oil recovery device 418 is provided in the liquid tank 40 and recovers the oil that has floated on the liquid level in the liquid tank 40. Of the fine particles and oil contained in the cleaning liquid flowing into the liquid tank 40 from the inflow conduit 401, the fine particles are agglomerated by the flocculant. Ascend to the liquid level. The floating oil is recovered by naturally flowing in from the oil recovery unit 431 of the oil recovery device 418, and is stored in the oil storage tank 420 that stores oil as a contaminant by the centrifugal pump 419 shown in FIG. Sent to.

  Here, the oil recovery device 418 is equipped with a plurality of floats 432 so that the floating oil component naturally flows into the oil recovery unit 431 quantitatively, and the buoyancy of the float 432 causes the water level of the cleaning liquid in the liquid tank 40 to fluctuate. The oil recovery device 421 follows. The upper surface of the oil recovery part 431 is open, and this opening has a circular frequency shape as shown in FIG. 6, for example. Thus, the portion located above the water surface and the portion located below the water surface are alternately continued, the inflow area to the oil recovery unit 431 is adjusted, and a liquid near the water surface is required. It is preferable to adopt a configuration that does not collect the above. The oil recovery device is not limited to this, and a known configuration may be used.

  Furthermore, as shown in FIG. 5, a partition wall 409 that is slightly lower than the liquid level in the tank is provided in the liquid tank 40, and the supernatant liquid over the partition wall 409 is fed to the liquid supply unit 41.

  The configuration of the liquid supply unit 41 will be described with reference to FIGS. 3 and 4. 44 is a pump that feeds the cleaning liquid in the liquid tank 40 to the processor 15, and 45 is provided on the pump 44 and the bottom plate 46 of the liquid tank 40. A suction pipe 47 connected to a drain outlet (not shown), and a water supply pipe 47 connected to a discharge outlet (not shown) of the pump 44.

  The water pipe 47 is branched into two water pipes 49 via a joint 48. These water supply pipes 49 are disposed at lower portions on both side surfaces in the width direction of a processing tank 53 (described later) of the processing machine 15, and a plurality of water supply holes 50 facing the inside of the processing tank 53 are provided on the side surfaces at a predetermined pitch. ing. In addition, a plurality of small holes (not shown) are provided at positions corresponding to the water supply holes 50 on the side surface of the treatment tank 53 described later, and these are connected to the water supply holes 50 by a water supply pipe or the like (not shown). The pump 44 is of a known configuration (for example, a spiral pump), and the cleaning liquid from the suction pipe 45 is discharged to the water supply pipe 47 by a directly connected drive device (electric motor or the like) 52, and further the water supply pipe The cleaning liquid is supplied into the treatment tank 53 through 49 and its water supply hole 50.

  As shown in FIG. 5, the flocculant supply unit 421 is provided on the top plate 400 via a stand 422. The flocculant supply unit 421 includes a flocculant tank 423, an electromagnetic valve cock 424, a tube hose 425 for introducing the flocculant into the liquid tank 40, and an impeller-type flow meter (not shown). The flow rate is detected based on the number of rotations of the flow meter, and the dripping amount of the flocculant is controlled by controlling the excitation time of the cock 424 with a solenoid valve. The dripping amount of the flocculant is determined by the amount of the cleaning liquid flowing into the liquid tank 40 detected by the flow meter 404 provided in the inflow conduit 401.

FIG. 8 is an axial sectional view showing a detailed structure of the processing machine 15 provided in the contaminated soil processing apparatus of the present embodiment, and FIGS. 9 and 10 are respectively taken along the IX-IX cross section and the XX cross section in FIG. It is sectional drawing. 8 to 10, the same parts as those in the previous drawings are denoted by the same reference numerals and description thereof is omitted.
8 to 10, reference numeral 53 denotes a processing tank that forms the main body of the processing machine 15, and this processing tank 53 is separated from a small-diameter portion 53 a that functions as a pollutant peeling function part that peels oil from contaminated soil. In addition, it is constituted by connecting the pollutant mixed in the contaminated soil with the large-diameter portion 53b that functions as the pollutant separating function portion, and is substantially centered in the longitudinal direction of the main body frame 7 via the support member 54. It is supported substantially horizontally above. 55 is an inlet provided in the upper part on the front side of the processing tank 53 for introducing earth and sand from the transfer conveyor 21, 56 is an outlet provided in the lower part on the rear side of the processing tank 53. Except for the mouth 55 and the discharge port 56, it has a watertight structure, and its lower side is along the rotation trajectory of a paddle mixer 58 (details will be described later), which is a stirring means for contaminated soil, as shown in FIGS. The cross section is formed in an arc shape.

  In the present embodiment, the small-diameter portion 53a, which is a treatment tank of the contaminant removing function portion, is formed so that its inner wall follows the rotation trajectory of the paddle mixer 58, as shown in FIG. As a result, the water level of the cleaning liquid in the small diameter portion 53a is limited to a level slightly higher than the height of the rotation trajectory of the paddle mixer 58 in a state where the contaminated soil is inevitably introduced, and the small diameter portion 53a is contaminated. A cleaning solution having a first water level sufficient to make the soil slurry is prepared.

  On the other hand, as shown in FIG. 10, the large-diameter portion 53b, which is a treatment tank of the contaminant separating function portion in the present embodiment, is formed to have a predetermined spatial volume above the rotational trajectory of the paddle mixer 58. ing. As a result, a cleaning liquid having a second water level that is higher than the first water level of the small diameter part 53a is provided in the large diameter part 53b. In the second water level, the distance between the liquid level of the cleaning liquid and the rotation trajectory of the paddle 61 (described later) is sufficiently secured, and the oil component that floats separately from the contaminated soil is caught in the contaminated soil by the paddle mixer 58 again. A height that is not so high is preferable. 57 is a water level sensor provided on the inner wall of the large-diameter portion 53b. The water level sensor 57 detects the water level of the cleaning liquid stored in the large-diameter portion 53b.

  The paddle mixer 58 includes a rotation shaft 59 inserted in the longitudinal direction of the processing tank 53 (left and right direction in FIG. 8), and paddles (stirring blades) fixed to each paddle seat 60 provided radially in the rotation shaft 59. 61. In the present embodiment, two paddle mixers 58 are provided substantially in parallel, and those of the pollutant separation function part (small diameter part 53a) and the contaminant separation function part (large diameter part 53b) are connected to each other.

  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 these paddles 61 and the distance between the adjacent rotating shafts 59 and 59 are set such that the mutual paddles 61 do not touch the other rotating shaft 59 during rotation. Further, each paddle 61 is attached to be inclined at a predetermined angle with respect to the rotation direction as shown in the figure. When the inclination angle of the paddle 61 is a predetermined angle (for example, about 55 ° with respect to the axial direction of the rotary shaft 59), the earth and sand transfer ability is maximized, and the earth and sand transfer ability and the stirring ability are adjusted by taking this inclination angle into consideration. can do.

  In the present embodiment, the pollutant peeling function unit places more emphasis on the agitation function than the transfer function, and the paddle 61 extends in the axial direction of the rotary shaft 60 so that the transfer capacity gradually decreases from the upstream side and the agitation capacity increases. The angle formed with respect to it is gradually reduced (or increased) from the upstream side. Thereby, in the small diameter part 53a, earth and sand residence time is ensured and it fully stirs. On the other hand, the paddles 61 are arranged at an angle at which a transfer function can be efficiently obtained so that the soil separation function unit does not excessively agitate the earth and sand. In this way, the inclination angle of the paddle 61 of the paddle mixer 58 of the pollutant separation function unit is suppressed as compared with the inclination angle of the paddle 61 of the paddle mixer 58 of the contaminant separation function unit, and the stirring ability is improved. Is set to

  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 this bearing 64 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 electrically driven) that rotationally drives the paddle mixer 58. An output shaft (not shown) of the drive device 66 is coupled to one end portion of both rotary shafts 59 (not shown). It is connected through.

  At this time, the two paddle mixers 58 partially overlap with each other as shown in the figure, and need to be rotated in reverse at substantially the same rotational speed in order to avoid interference between the paddles 61. Therefore, the transmission gears 67 provided on the two rotation shafts 59 are engaged with each other in the drive unit housing 62, so that both the paddle mixers 58 are reversely rotated 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 shown in particular, the attachment portion of the discharge valve 68 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 part 16 are watertightly 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. Is discharged to the discharge portion 16 by a substantially constant amount.

  As described above, the processing tank 53 has a substantially water-tight 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 cause are caught and the smoothness of the paddle mixer 58 is obtained. It cannot be said that there is no possibility of inhibiting the 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.

  Reference numeral 72 denotes a maintenance drain provided in the lower portion of the front side wall surface of the processing tank 53. For maintenance, for example, an on-off valve 73 using a ball valve or the like is operated to operate the maintenance drain 72. The earth and sand (fine particles) in the treatment tank 53 and the suspended cleaning liquid can be positively discharged.

  When processing high-concentration contaminated soil, a large amount of oil, which is a contaminant, may float on the water surface in the processing tank 53. In that case, although not specifically shown, an oil recovery device similar to the oil recovery device 418 provided in the liquid tank 40 is provided and sent to the oil storage tank 420 via a spiral pump and a hose (not shown). May be.

  With the above configuration, in the processor 15, the paddle mixer 58 is rotationally driven by the driving device 66, and the contaminated soil is transferred to the discharge side while being stirred and cleaned in the cleaning liquid, and the discharge valve 68 is appropriately driven, The washed earth and sand are led to the discharge unit 16 through the discharge port 56.

FIG. 11 is a front view showing a detailed structure of the discharge unit 16 provided in the contaminated soil treatment apparatus of the present embodiment. In FIG. 11, the same parts as those in the previous drawings are denoted by the same reference numerals. Is omitted.
As shown in FIG. 11, the discharge unit 16 is a discharge means for discharging the earth and sand discharged from the processing machine 15 to the outside of the machine, and a screw conveyor 74 is used in the present embodiment. 75 is a substantially cylindrical casing that forms the main body of the screw conveyor 74. On the upstream side (left side in FIG. 11) of the casing 75 in the transfer direction, a discharge valve 68 is provided at the discharge port 56 of the processing tank 53 as described above. An upward inlet 76 connected in a watertight manner is provided, and a downward outlet 77 is provided on the downstream side (right side in FIG. 11). At this time, the casing 75 is moved from the lower position of the processing machine 15 to the earth and sand transfer direction (FIG. 11) so that the height position of the outlet 77 is higher than the cleaning liquid water level (symbol ▽ in the figure) in the processing tank 53. (Middle right direction) is arranged in an upward slope.

  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 configuration, the screw conveyor 74 conveys only the soil and sand from the processing machine 15 that has been subjected to the cleaning process while dehydrating without leaking the cleaning liquid in the processing tank 53, and discharges it to the outside through the outlet 77. It has become.

  1, 88 is a power unit (power unit) of the contaminated soil treatment apparatus of the present invention, 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. Has been. 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 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 contaminated soil treatment apparatus is operated to travel.

  91 is an operation panel for performing various settings and operations related to the operation of the contaminated soil treatment apparatus, 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 places of the contaminated soil treatment apparatus and operation signals corresponding to operations from the operation panel 91 are input, and each hydraulic pressure excluding the driving device 5 for traveling is input. A control device 92 (see FIG. 12) is provided that outputs a command signal corresponding to an input signal to a control valve corresponding to the drive device and other electric drive devices.

FIG. 12 is a block diagram illustrating a schematic configuration of the control device 92 provided in the contaminated soil treatment apparatus of the present embodiment.
In FIG. 12, 93 is an input unit for inputting detection signals from the sensors and operation signals from the operation panel 91 to convert them into digital signals, and 94 is a read-only storage for storing control procedure programs and constants necessary for arithmetic processing. Memory (ROM), 95 is a timer for measuring time, 96 is a command stored in the ROM 94, and the command signal to the corresponding device (control valve, electric drive device, etc. corresponding to each hydraulic drive device) is calculated. Central processing unit (CPU). Reference numeral 97 denotes a random access memory (RAM) that temporarily stores calculation results of the CPU 96 and numerical values during the calculation, and 98 denotes an output unit that converts the command signal calculated by the CPU 96 into an analog signal and outputs it to a corresponding device.

Next, the operation and action of the contaminated soil treatment apparatus of the present embodiment described above will be described.
For example, when excavating soil to be treated, that is, contaminated soil containing petroleum-based oil contaminants with a hydraulic excavator or the like and putting it into the sieve device 19, the introduced earth and sand is latticed by the vertical vibration of the sieve device 19. Foreign matter and the like larger than the eyes are removed, and earth and sand components smaller than the eyes of the lattice 26 are temporarily stored in the hopper 20. The earth and sand 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 treatment tank 53.

  The cleaning liquid is supplied from the cleaning liquid supply unit 18 to the small diameter part 53a (contaminant separating function part) and the large diameter part 53b (contaminant separation function part) in the processing tank 53, and the first and second water levels described above are respectively supplied. The cleaning liquid is stored. In the present embodiment, since the small-diameter portion 53a and the large-diameter portion 53b, which are processing tanks for the pollutant separation function section and the pollutant separation function section, are connected in series, the level of the cleaning liquid in the large-diameter section 53b is the first level. If the water level is maintained at level 2, the small-diameter portion 53a naturally holds the first level cleaning liquid. The water level of the cleaning liquid in the large diameter portion 53 b is detected by the water level sensor 57, and the detection signal is input to the control device 92. The control device 92 calculates the water level of the cleaning liquid in the processing tank 53 by the CPU 96 based on the detection signal from the water level sensor 57 converted into a digital signal via the input unit 93. Then, the CPU 96 determines the excess or deficiency of the cleaning liquid by comparing the calculation result with the set water level stored in advance in the ROM 94. When the water level of the cleaning liquid is lower than the set water level, the driving of the cleaning liquid supply unit 18 is performed. A command signal (drive signal) is output to the device 52, the pump 44 is driven until the cleaning liquid in the processing tank 53 returns to the set water level, and the cleaning liquid in the liquid tank 40 is processed through the water supply pipe 47 and the water supply pipe 49. Supply in 53.

  In the treatment tank 53, the earth and sand are stirred and washed by the paddle mixer 58 in the washing liquid maintained at the set water level as described above. At this time, the pollutant removal function section can rotate the pollutant from the contaminated soil, and the pollutant separation function section can remove contaminants that have been separated by the contaminant removal function section and still mixed in the contaminants. The paddle mixer 58 is driven at a rotational speed that allows separation from the contaminated soil. In the present embodiment, the paddle mixer 58 has a structure in which the pollutant separation function part and the separation function part are connected to each other, and therefore the rotational speed of the paddle mixer 58 in both function parts is the same, but as described above in both function parts. By adjusting the inclination angle of the paddle 61, the rotational speed of the paddle mixer 58 required by the contaminant removing function section and the contaminant separating function section is made substantially the same.

  Therefore, in the small-diameter portion 53a that is the pollutant peeling function portion, the contaminated soil is sufficiently agitated by the paddle mixer 58 in the cleaning liquid at the first water level that is slurried, and other contaminated soil particles, the paddle 61, and the small-diameter portion Washing is performed in such a manner that frequent friction with the inner wall of 53a and the like is repeated and the pollutants are efficiently separated from the contaminated soil. At this time, as described above, each paddle 61 of the paddle mixer 58 is attached at an angle such that the transfer speed gradually decreases as it goes downstream in the transfer direction of the contaminated soil in the pollutant peeling function unit. As a result, the contaminated soil becomes consolidated as it is transferred, and the frictional action between the soil particles works effectively, so that the oil is efficiently separated from the soil.

  On the other hand, in the large-diameter portion 53b, which is a pollutant separation function unit, the contaminated soil from the pollutant stripping function unit is continuously supplied, and the contaminated soil in the cleaning liquid at the second water level higher than the first water level. Is stirred by the paddle mixer 58. In this pollutant separation function unit, the paddle mixer 58 does not soar the contaminated soil particles, but the pollutant existing in the gaps in the contaminated soil is excavated and separated from the contaminated soil although it has been stripped by the pollutant stripping function unit. Stir and transfer as much as possible. As a result, the pollutant separated from the contaminated soil floats near the liquid surface of the cleaning liquid along with the upward flow gently formed by the paddle mixer 58 and flows into the liquid tank 40 through the inflow conduit 401 together with the cleaning liquid. The contaminated soil (clean soil) separated from the substance is discharged from the treatment tank 53 through the discharge port 56.

  The clean soil obtained by washing in the treatment tank 53 as described above is led into the screw conveyor 74 through the discharge valve 68 and is discharged while being dehydrated by the screw conveyor 74.

  The oil in the cleaning liquid after the cleaning process that has flowed into the liquid tank 40 floats on the liquid surface of the liquid tank 40 and is captured and recovered by the oil recovery device 418. In addition, the liquid tank 40 may contain fine particles of earth and sand in the cleaning liquid after the cleaning process. The fine particles are added to the flocculant supplied from the flocculant tank 423 and the stirring device 413. And agglomerate, precipitate and collect in the recovery case 407. The cleaning liquid from which oil and fine particles have been removed by such purification action is circulated and supplied again to the processing tank 53 of the processing machine 15 through the suction pipe 45 and reused.

  As described above, according to the present embodiment, the contaminated soil is agitated in the cleaning liquid having the first water level to the extent that the contaminated soil is slurried as described above. Therefore, the contaminated soil is not affected by the rotational speed of the paddle mixer 58. The contaminated soil can be washed effectively and the pollutants can be peeled off while preventing the particles from rising and simply floating in the cleaning solution. Also, the pollutant separation function part in the latter stage separates the polluted substances separated from the contaminated soil by stirring so that the soil particles do not rise in the cleaning liquid at the second water level higher than the first water level. It is possible to float near the cleaning liquid surface. Therefore, according to the present embodiment, the contaminated soil can be washed efficiently. Further, by using the paddle mixer 58, the earth and sand can be sufficiently stirred while being crushed by the paddle 61 in the treatment tank 53, so that a sufficient cleaning effect is exhibited.

  In addition, according to the present embodiment, the equipment that constitutes the contaminated soil supply unit 14, the processing unit 15, the discharge unit 16, and the like are centrally arranged on the main body frame 7. The washing treatment equipment can be mounted on the traveling body 1, and thus the inside of the excavation site can be driven by itself.

  Therefore, even when a sufficient installation space cannot be secured, it is possible to work while changing the layout of the cleaning treatment equipment as appropriate within the excavation site according to the progress of the work, so without taking out contaminated soil from the excavation site. In addition, the contaminated soil can be efficiently cleaned by effectively using the space in the excavation site. In addition, when the treated soil is backfilled, excavation is performed by operating the operating lever 90 to self-propell the contaminated soil treatment apparatus and move the work place to the vicinity of the excavated soil using a hydraulic excavator or the like. It is also possible to backfill the soil directly in the location, which reduces the burden of earth and sand transport work and greatly improves work efficiency.

  In addition, since the cleaning liquid supply unit 18 is provided, the cleaning liquid in the processing tank 53 can be constantly maintained at the set water level by controlling the cleaning liquid in the processing tank 53 based on the detected water level. Thereby, it is not necessary to interrupt the process to supply the cleaning liquid to the processing tank with the work, and the cleaning process can be performed continuously. Furthermore, since the cleaning liquid purification means is provided in the liquid tank 40, the cleaning liquid can be purified and reused, and work on site where an external water source cannot be secured is also possible.

  In addition, when batch processing is performed using the contaminated soil processing apparatus of the present embodiment, the control can be controlled by the control device 92 so that the screw conveyor 74 is driven only when discharging the soil from the processing tank 53, and the processing is in progress. Energy efficiency can be improved.

FIG. 13 is an axial sectional view showing the detailed structure of the treatment tank 15 provided in another embodiment of the contaminated soil treatment apparatus of the present invention. In FIG. The same reference numerals are given and description thereof is omitted.
In FIG. 13, the present embodiment is different from the above-described one embodiment of the contaminated soil treatment apparatus of the present invention in that the inclination angle of the paddle 61 in the small-diameter portion 53a, which is the pollutant peeling function unit, is determined by the pollutant separation. This is the same as the inclination angle of the paddle 61 in the large-diameter portion 53b which is a functional portion, and the other configurations are the same as in the previous embodiment.

  Due to the above configuration, in this embodiment, the agitation function and the transfer function of the paddle mixer 58 of the pollutant separation function part and the pollutant separation function part are equivalent. Even in such a configuration, for example, when the contaminated soil having a low contamination concentration is targeted, the stirring and transfer functions required by the pollutant separating function unit are equivalent to the pollutant separating function unit. The pollutant is effectively peeled from the contaminated soil in the cleaning liquid at the first water level in the pollutant peeling function section, and the pollutant is separated from the contaminated soil in the pollutant separation function section. Therefore, the same effect as described above can be obtained.

FIG. 14 is an axial sectional view showing a detailed structure of a treatment tank 15 provided in still another embodiment of the contaminated soil treatment apparatus of the present invention. In FIG. 14, the same parts as those in the previous drawings are shown. Are denoted by the same reference numerals and description thereof is omitted.
In FIG. 14, the present embodiment is different from the above-described one embodiment of the contaminated soil treatment apparatus of the present invention in that the agitation means of the pollutant separating function unit and the pollutant separating function unit are independent from each other. This is that the agitation means of the pollutant separation function part is rotated at a higher speed than the agitation means of the contaminant separation function part, and the other configurations are the same as in the previous embodiment.

  In the present embodiment, the processing tank 53 has substantially the same configuration as each of the above-described embodiments, and is a processing tank for the small-diameter portion 53a that is a processing tank for the pollutant separation function part A and a processing tank for the pollutant separation function part B. The large-diameter portion 53b is formed to be connected. At this time, a bearing 101 supported by a support member 100 fixed to the front side wall surface of the large-diameter portion 53b is disposed between the pollutant peeling function part A and the pollutant separation function part B. .

  In the paddle mixer 58a of the contaminant peeling function part A, both ends of the rotating shaft 59a are supported by bearings 63 and 101. In the present embodiment, each paddle 61a of the paddle mixer 58a has the same inclination angle as that of the pollutant peeling function portion of the example shown in FIG. 8, but as in the example shown in FIG. In addition, an inclination angle similar to that of the pollutant separation function unit may be used. On the other hand, in the paddle mixer 58b of the contaminant separating function part B, both ends of the rotating shaft 59b are supported by bearings 101 and 64. Each paddle 61b of the paddle mixer 58b has an inclination angle similar to that of the pollutant separation function unit of each example shown in FIGS. In the present embodiment, two such paddle mixers 58a and 58b are provided adjacent to each other in the width direction of the processing tank 53 (the direction orthogonal to the paper surface).

  Reference numeral 102 denotes a drive device for the paddle mixer 58b of the pollutant separation function part B. The output shaft of the drive device 102 is connected to the rotary shaft 59b via a coupling (not shown). Reference numeral 103 denotes a gear. This gear 103 is provided in the vicinity of the end of the adjacent rotary shafts 59b and 59b in the contaminant separating function part B, and the adjacent rotary shafts 59b and 59b are engaged with each other. The two paddle mixers 58b, 58b of the pollutant separation function part B are rotated in reverse at substantially the same rotational speed. Note that the drive device 66 and the gear 67 of the paddle mixer 58a on the contaminant peeling function part A side have the same configuration as that of the paddle mixer 58 in each of the above-described embodiments.

  In the present embodiment, the same effects as those of the above-described embodiments can be obtained, and the paddle mixers 58a and 58b are driven at different rotational speeds in the pollutant separation function part A and the pollutant separation function part B, respectively. be able to. Therefore, according to the present example, for example, in the pollutant peeling function unit A, the paddle mixer 58a is rotated at a higher speed than in the previous embodiments and stirred more strongly, thereby more effectively removing the pollutant from the contaminated soil. Can be peeled off. In the pollutant separation function unit B, the paddle mixer 58b is rotated at a lower speed than the paddle mixer 58a, so that the pollutant can be reliably separated without causing the soil particles to rise.

FIG. 15 is a diagram showing an extracted main part of still another embodiment of the contaminated soil treatment apparatus of the present invention. In FIG. 15, the same parts as those in the previous figures are denoted by the same reference numerals. Is omitted.
In FIG. 15, the present embodiment is different from the above-described embodiments in that the treatment tanks of the pollutant separation function section and the contaminant separation function section are independent from each other.

  As shown in FIG. 15, in the present embodiment, a downstream processing machine 15 </ b> B that constitutes a pollutant separation function unit is provided separately from the preceding processing machine 15 </ b> A that constitutes the pollutant separation function part. The discharge port 56A of the processing tank 53A of the processing machine 15A is connected to the introduction port 55B of the processing tank 53B of the processing machine 15B via a discharge valve 68A. The processing tank 53A may have a shape along the rotational trajectory of the paddle mixer 58A provided in the inside thereof, like the processing tank (small-diameter portion 53a) of the pollutant peeling function section in each of the above-described embodiments, but is simply the first A rectangular cross-section box having a height of the water level may be used. The processing tank 53B has a height that is sufficiently high with respect to the rotational trajectory of the paddle mixer 58B provided therein, as in the processing tank (large-diameter portion 53b) of the contaminant separating function section in each of the above-described embodiments. The water level of the cleaning liquid can be stored. Two paddle mixers 58A and 58B are provided adjacent to each other in the width direction of the processing tanks 53A and 53B (in the direction orthogonal to the paper surface), and are fixed to the outer wall portions of the processing tanks 53A and 53B, respectively. Driven by the driving devices 66A and 66B.

  With such a configuration, the contaminated soil introduced onto the conveyor 21 via the sieve device 19 and the hopper 20 (not shown) is contained in the treatment tank 53A containing the first level cleaning liquid through the inlet 55A. Agitation is performed by the paddle mixer 58A, and the contaminants are separated from the contaminated soil. The contaminated soil from which the contaminants have been peeled is introduced into the treatment tank 53B containing the second level water cleaning liquid via the discharge valve 68A, and is agitated by the paddle mixer 58B in the treatment tank 53B. As a result, the peeled contaminants float up near the cleaning liquid surface and are separated from the contaminated soil. The contaminated soil separated from the pollutant is led to the discharge unit 16 through the discharge port 56B and the discharge valve 68B, and is discharged outside the apparatus. In the present embodiment, the mechanisms as described above may be centrally arranged on the traveling device via the main body frame, or fixed equipment may be used.

  According to the present embodiment, the same effects as those of the above-described embodiments can be obtained, and the roles of the two functional units are different by making the pollutant peeling functional unit and the pollutant separating functional unit independent of each other. The treatment machines 15A and 15B can be shared, and a more effective cleaning effect can be obtained.

FIG. 16: is a side view showing the whole structure of one Embodiment of the contaminated soil processing system of this invention. In FIG. 16, the same parts as those in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted.
In FIG. 16, in this embodiment, the pollutant separation function and the separation function are assigned to the two contaminated soil treatment apparatuses 150 and 250, and the contaminated soil treatment apparatus 150 and the contaminants in the previous stage for stripping the contaminants are separated. This is an example in which the contaminated soil treatment system is configured by arranging the separated contaminated soil treatment device 250 to be separated in tandem.

FIG. 17 is a side view showing the overall configuration of the contaminated soil treatment apparatuses 150 and 250 that constitute the contaminated soil treatment system of the present embodiment. In this figure, parts similar to those in the previous figures are given the same reference numerals, and description thereof is omitted.
As shown in FIG. 17, the configuration of the contaminated soil treatment devices 150 and 250 is substantially the same as the configuration of the contaminated soil treatment device described with reference to FIGS. 1 to 12 except for the configuration of the processing machine 15 ′.

FIG. 18 is a cross-sectional view showing the detailed structure of the processing machine 15 ′ provided in the contaminated soil processing apparatuses 150 and 250. In this figure, parts similar to those in the previous figures are given the same reference numerals, and description thereof is omitted.
As shown in FIG. 18, the treatment tank 53 ′ of the treatment machine 15 ′ provided in the contaminated soil treatment apparatuses 150 and 250 is not divided into a small diameter part, a large diameter part, and the like, and the treatment machine 15 shown in FIG. Is substantially the same as the shape of the processing tank 53 in which the small-diameter portion 53a is replaced with the large-diameter portion 53b. However, since the treatment tanks 53 ′ in the contaminated soil treatment apparatuses 150 and 250 are driven in a state where the cleaning liquids at the first water level and the second water level are stored, the arrangement height of the water level sensor 57 is different. That is, in the treatment tank 53 ′ of the contaminated soil treatment apparatus 150, the water level sensor 57 is attached at a position about the first water level (for example, the height of the upper end of the rotation trajectory of the paddle mixer 58). In the treatment tank 53 ′ of the contaminated soil treatment apparatus 250, as shown in FIG. 18, the second water level higher than the first water level (for example, a height sufficient with respect to the rotation trajectory of the paddle mixer 58) is set. A water level sensor 57 is attached.

  With the configuration as described above, the contaminated soil treatment apparatus 150 is disposed in the treatment tank 53 ′ in which the cleaning liquid having the first water level that causes the contaminated soil to become a slurry is contained in the treatment machine 15 ′, which is the contaminant peeling function unit. The paddle mixer 58 is driven at a rotational speed at which the pollutant is separated from the contaminated soil. On the other hand, the contaminated soil treatment apparatus 250 is a contaminated soil treatment apparatus 150 in a treatment tank 53 ′ containing a cleaning liquid having a second water level higher than the first water level in the treatment machine 15 ′ which is the contaminant separation function unit. The paddle mixer 58 is driven at a rotational speed that separates the pollutant that has been peeled off in step 1 from the contaminated soil.

FIG. 19 is a diagram showing an extracted main part of the contaminated soil treatment system of the present embodiment. In this figure, parts similar to those in the previous figures are given the same reference numerals and explanation thereof is omitted.
In FIG. 19, for example, when contaminated soil is introduced into the sieve device 19 of the contaminated soil treatment device 150 by a hydraulic excavator or the like, the contaminated soil is guided onto the transfer conveyor 21 via the hopper 20, and the contaminated soil is removed from the contaminant. Is supplied to the preceding processing unit 15 ′ constituting the part. The treatment tank 53 ′ of the pre-treatment device 15 ′ contains a first level cleaning solution, and the introduced contaminated soil is agitated by the paddle mixer 58 in the first level cleaning solution to remove the contaminants. The In the contaminated soil treatment device 150, the control device 92 controls the water level of the cleaning liquid in the treatment tank 53 ′ to be the first water level according to the detection signal of the water level sensor 57. Further, in the former processing machine 15 ', an effective contaminant peeling effect can be obtained by setting the rotational speed of the paddle mixer 58 to be relatively high. Then, the contaminated soil from which the contaminant has been peeled is led to the discharge unit 16 and is discharged from the contaminated soil treatment apparatus 150.

Next, the contaminated soil discharged from the contaminated soil treatment device 150 is supplied to the sieving device 19 of the contaminated soil treatment device 250, and the subsequent processing machine constituting the contaminant separation function unit via the hopper 20 and the transfer conveyor 21. 15 '. The treatment tank 53 ′ of the subsequent processing unit 15 ′ is provided with a second water level cleaning liquid, and the introduced contaminated soil is stirred by the paddle mixer 58 in the second water level cleaning liquid and separated in the preceding step. However, it is separated from the contaminants that still remain in the contaminated soil gap. In the contaminated soil treatment device 250, the control device 92 controls the water level of the cleaning liquid in the treatment tank 53 ′ to be the second water level according to the detection signal of the water level sensor 57. Further, in the processing machine 15 ′ of the contaminated soil treatment apparatus 250, an efficient effect of separating pollutants can be obtained by setting the rotational speed of the paddle mixer 58 to be relatively slow. Finally, the contaminated soil separated from the pollutant is led to the discharge unit 16 and discharged from the contaminated soil treatment apparatus 250.
The other operations relating to the circulation supply of cleaning liquid, the purification process, etc. are the same as the contaminated soil treatment apparatuses 150 and 250 in the above-described embodiments.

  In each of the above-described embodiments, the example in which the contaminated soil is cleaned by one contaminated soil processing apparatus having the contaminant separating function unit and the contaminant separating function unit has been described. As in the present embodiment, Even in a contaminated soil treatment system in which two contaminated soil treatment devices each serving as a contaminant release function section and a contaminant separation function section are arranged, the same effects as those of the above-described embodiments can be obtained.

FIG. 20 is a cross-sectional view in which a treatment tank 15 ′ provided in another embodiment of the contaminated soil treatment system of the present invention is broken along a plane orthogonal to the axis of the rotation shaft 59 of the paddle mixer 58. In FIG. 20, the same parts as those in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted.
In FIG. 20, this embodiment is different from the above-described embodiments of the contaminated soil treatment apparatus of the present invention in that the paddle 61 on the upper side of the paddle mixer 58 in the contaminated soil treatment apparatus 150 in the preceding stage is along the rotation trajectory. The arc-shaped cover bodies 104 and 105 are provided, and other configurations are the same as those in the contaminated soil treatment system shown in FIGS.

  The cover bodies 104 and 105 are located above the paddle mixers 58 and in the direction perpendicular to the axis of the rotation shaft 59, that is, in the widthwise direction of the processing tank 53 ′, close to the rotation trajectory of the paddle 61. It is fixed to the inner wall of 53 '. The cover bodies 104 and 105 are open. However, the cover bodies 104 and 105 may be connected and closed.

  In the present embodiment, of course, the same effects as those of the contaminated soil treatment system shown in FIGS. 16 to 19 can be obtained, and the upper part of the paddle mixer 58 is covered with the cover bodies 104 and 105 in the contaminant separating function unit. Therefore, even if the driving speed of the paddle mixer 58 is set at a higher speed, the soil particles are not held by the cover bodies 104 and 105 and are not scattered or rolled up in the cleaning liquid, so that the oil from the earth and sand is more effective. Can be peeled off.

  Moreover, the oil component adsorbed on the contaminated soil can be effectively separated by a simple method, and the separated oil component and the oil component existing in the gap can be efficiently separated from the earth and sand. In addition, even when a sufficient installation space cannot be ensured, the traveling body 1 is provided, so that it is possible to work while changing the layout of the cleaning treatment equipment as appropriate within the excavation site according to the progress of the work. Therefore, the contaminated soil can be efficiently cleaned by effectively utilizing the space in the excavation site without taking out the contaminated soil from.

  In the example described with reference to FIGS. 16 to 19, the system that performs the cleaning process continuously using the two contaminated soil treatment apparatuses 150 and 250 has been described. The same processing can be performed by batch processing using any one of them. In the case where sediments that require a sufficient cleaning time in the treatment tank 53 ′, such as highly-concentrated soil, highly viscous soil, or fine-grained sediment, are subjected to batch processing as described below. And more effective.

FIG. 21 is a flowchart showing an example of a control procedure by the control device 92 when batch processing is performed using the contaminated soil treatment device of the present invention. When batch processing is performed, the cleaning liquid is circulated and reused by putting a necessary amount of the cleaning liquid in the processing tank 53 in advance and starting the liquid supply unit 41 and the liquid suction unit 403 in advance.
In the case of performing batch processing, as shown in FIG. 21, the control device 92 first, in step 111, the processing conditions such as the stirring speed, processing time, amount of processing soil and sand input by the operation panel 91, and the like. Is input via the input unit 93, converted into a digital signal, and stored in the RAM 97.

  In the subsequent step 112, it is determined whether or not an operation start operation has been performed by the operation panel 91, and it is confirmed that an operation start operation signal has been input, and the procedure proceeds to step 113. At this time, at least the transport conveyor 21 is stopped, and the sieve device 19 is also stopped if the earth and sand has been charged into the hopper 20.

  In step 113, a necessary amount of cleaning liquid is supplied to the processing tank 53 '. The required amount here is the first water level, which is the same as or slightly higher than the rotational trajectory of the paddle mixer 58.

  In the next step 114, a command signal for instructing activation is output to the transport drive device 36 (strictly, its control valve), and the transport conveyor is driven. The command signal for instructing activation at this time is calculated by the CPU 96 so that the transport driving device 36 is driven at the set transport speed based on the transport speed input in step 111, and is converted into an analog signal via the output unit 98. Is output. The driving time of the conveyor 21 is calculated so that a predetermined amount of earth and sand is introduced into the processing tank 53 ′ by the conveyor 21 based on the conveying speed and the amount of earth and sand.

  When the time is measured by the timer 95 for the calculated drive time, in step 115, a command signal for commanding the stop is output to the transport drive device 36, and the transport conveyor 21 is stopped. Thereby, the amount of processing earth and sand set at Step 111 is introduced into the processing tank.

  When the introduction of the earth and sand to the treatment tank 53 ′ is completed, the procedure is moved to the next step 116, a command signal for alternately instructing forward / reverse rotation is output to the mixing drive device 66, and the paddle mixer 58 is given a predetermined time. Only forward rotation and reverse rotation drive are repeated. The higher the stirring speed at this time, the better. The command signal is calculated by the CPU 96 so that the paddle mixer 58 is driven at the high speed stirring speed input in step 111, and the driving time of the paddle mixer 58 during this time is input in step 111. The timer 95 measures the time for the agitated time. During this time, the earth and sand in the treatment tank 53 'is repeatedly stirred and washed by the paddle mixer 58, and the oil adsorbed on the earth and sand is separated from the earth and sand.

  When the stirring time set in step 111 is measured by the timer 95, the CPU 96 outputs a command signal for additionally supplying a necessary amount of cleaning liquid in step 117. Here, the necessary amount is the second water level at which a sufficient distance from the upper end of the rotation locus of the paddle mixer 58 is ensured.

  Next, in step 118, a command signal for instructing the discharge driving device 86 to start is output, the screw conveyor 74 is made to stand by in a driving state, and in conjunction with this, the procedure is shifted to step 119, and the driving device 69 is started. A command signal to be commanded is output, the discharge valve 68 is driven, and the earth and sand in the treatment tank 53 ′ is led to the screw conveyor 74.

  At the next step 120, the CPU 96 outputs a command signal for instructing only low speed driving to the normal rotation side from the command signal for repeatedly instructing normal rotation / reverse rotation of the mixing drive device 66 so far in accordance with the start of discharge of earth and sand. And the paddle mixer 58 is continuously driven to rotate in the forward direction at a low speed, and the paddle mixer 58 is transferred to the discharge side while unloading the earth and sand in the treatment tank 53 '. As a result, the oil that remains mixed in the earth and sand is separated from the earth and sand, floats on the surface of the cleaning liquid, and the earth and sand are discharged out of the machine by the screw conveyor 74 as clean earth.

  In step 121, a command signal for instructing the drive device 69 of the discharge valve 68 to stop is output, and the transfer of earth and sand from the processing tank 53 'to the screw conveyor 74 is stopped.

  Then, the procedure is shifted to step 122, and in response to the stop of the discharge valve 68, a command signal instructing the stop to the discharge drive device 69 is output, and the discharge of earth and sand is stopped. At this time, if it is assumed that the earth and sand being processed remains in the processing tank 53, the mixing is performed so that the earth and sand in the processing tank 53 is generally led to the screw conveyor 74 before the discharge valve 68 is stopped. A command signal is output to the drive device 66 (strictly, the corresponding control valve) to drive the paddle mixer 58 in the normal direction, and the time required for the sediment 95 in the processing tank 53 to be discharged by the paddle mixer 58 by the timer 95 (ROM 94). It is advisable to stop the discharge valve 68 after measuring time for the set value stored in (1).

  In step 123, the CPU 96 confirms whether or not the batch processing end operation has been performed by the operation panel. When an operation signal for instructing the processing end is input, the paddle mixer 58, the discharge valve 68, and the screw conveyor 74 are driven in this order. Stop and end the above procedure. On the other hand, the time required for the sediment discharging procedure in steps 118 to 122 can be roughly determined by the amount of processing soil and sand input in step 111 and the driving speeds of the paddle mixer 58, the discharge valve 68, and the screw conveyor 74. Therefore, the CPU 96 returns the procedure to Step 113 when the operation signal for ending the batch processing is not input even if the timer 95 measures the time for the time set according to the input amount of processing earth and sand. The procedure up to 123 is performed again (the next one batch process is started). However, the shift to the next batch processing may be manually instructed by operating the operation panel 91 without being configured to be automatically determined by the control device 92.

  Also in this example, the same effects as those of the above-described embodiments can be obtained.

  In the above description, the screw conveyor 74 has been described as an example of the earth and sand discharging means after the treatment. There is no particular limitation on the mode of the discharging means as long as it can carry out the high-moisture content earth and sand stirred in step (1). Therefore, for example, so-called bucket conveyors, pressure pumps, and the like are also applicable. In this case, the same effect can be obtained.

  In the above, an example in which the vibration-type sieving device 19 is provided has been described. For example, in the case where soil having a property that is relatively easy to process, such as soil having a small amount of foreign matter or soil having low viscosity, is used as a processing target. In this case, it may be replaced with a fixed sieve or may be omitted if unnecessary. Furthermore, although an example in which two paddle mixers are provided in the processing machine has been described, the number is not limited, and may be one or three or more. Moreover, although the hopper 20 was mentioned as an example as a means for receiving input earth and sand, for example, a chute or the like may be used instead. Further, the present invention is not necessarily limited to the paddle mixer. For example, a so-called screw mixer may be used instead of the paddle mixer. Furthermore, although the conveyance conveyor 21 was used as a means for conveying earth and sand from the hopper 20 to the processing machine, for example, a screw conveyor or the like may be used instead. In these cases, the same effect can be obtained.

It is a front view which shows the whole structure of one Embodiment of the contaminated soil processing apparatus of this invention. It is a front view which shows the detailed structure of the earth and sand supply part with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a front view which shows the detailed structure of the washing | cleaning liquid supply part with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a top view which shows the detailed structure of the washing | cleaning liquid supply part with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a front view which shows the detail of the liquid tank with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a side view showing the structure of the oil collection | recovery apparatus with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a top view showing the structure of the oil collection | recovery apparatus with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is an axial direction sectional view showing the detailed structure of the processing machine with which one embodiment of the contaminated soil processing apparatus of the present invention was equipped. It is sectional drawing by the IX-IX cross section in FIG. It is sectional drawing by the XX cross section in FIG. It is a front view which shows the detailed structure of the discharge part with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a block diagram showing schematic structure of the control apparatus with which one Embodiment of the contaminated soil processing apparatus of this invention was equipped. It is an axial direction sectional view showing the detailed structure of the processing tank with which other embodiments of the contaminated soil processing apparatus of the present invention were equipped. It is an axial sectional view showing the detailed structure of the processing tank with which further another embodiment of the contaminated soil processing apparatus of this invention was equipped. It is a figure which extracts and represents the principal part of other embodiment of the contaminated soil processing apparatus of this invention. It is a side view showing the whole structure of one Embodiment of the contaminated soil processing system of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view showing the whole structure of the contaminated soil processing apparatus which comprises one Embodiment of the contaminated soil processing system of this invention. It is sectional drawing showing the detailed structure of the processing machine with which the contaminated soil processing apparatus which comprises one Embodiment of the contaminated soil processing system of this invention was equipped. It is the figure which extracted and represented the principal part of one Embodiment of the contaminated soil processing system of this invention. It is sectional drawing which fractured | ruptured the processing tank provided in other embodiment of the contaminated soil processing system of this invention in the surface orthogonal to the axis line of the rotating shaft of a stirring means. It is a flowchart figure showing an example of the control procedure by the control apparatus in the case of batch-processing using the contaminated soil processing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Running body 53 Processing tank 53a Small diameter part 53b Large diameter part 53A, B Processing tank 53 'Processing tank 58 Paddle mixer 58a, b Paddle mixer 58A, B Paddle mixer 61 Paddle 150 Contaminated soil processing apparatus 250 Contaminated soil processing apparatus A Contaminant peeling function part B Pollutant Separation Function Department

Claims (8)

In contaminated soil treatment equipment that cleans contaminated soil containing pollutants,
A pollutant stripping function unit having a stirring means for stripping the pollutant from the contaminated soil in a treatment tank containing a first water level cleaning liquid to the extent that the contaminated soil is slurried;
Stirring means for separating the pollutant that is peeled off by the pollutant stripping function section and present in the gap of the polluted soil from the polluted soil in a treatment tank containing a cleaning liquid having a second water level higher than the first water level. A contaminated soil treatment apparatus, comprising:   The contaminated soil treatment apparatus according to claim 1, wherein a treatment tank of the contaminant removal function unit and the contaminant separation function unit are connected to each other.   2. The contaminated soil treatment apparatus according to claim 1, wherein treatment tanks for the contaminant removal function unit and the contaminant separation function unit are independent of each other.   The stirrer of the pollutant separation function unit and the stirrer of the pollutant separation function unit are paddle mixers, and the inclination angle of the paddle mixer of the pollutant stripping function unit is the paddle mixer paddle of the pollutant separation function unit. The contaminated soil treatment apparatus according to any one of claims 1 to 3, wherein the contaminated soil treatment apparatus is set so that the transfer ability of the contaminated soil is suppressed with respect to the inclination angle and the stirring ability is improved.   The agitation means of the contaminant removal function unit and the agitation means of the contaminant separation function unit are independent paddle mixers, and the paddle mixer of the contaminant removal function unit rotates at a higher speed than the paddle mixer of the contaminant separation function unit. The contaminated soil treatment apparatus according to any one of claims 1 to 4.   The contaminated soil treatment apparatus according to any one of claims 1 to 5, wherein the treatment tank of the contaminant peeling function part is formed so that an inner wall thereof follows a rotation locus of the stirring means. In a contaminated soil treatment system for cleaning contaminated soil containing pollutants,
A contaminated soil treatment apparatus provided with a pollutant removal function unit having a stirring means for removing contaminants from the contaminated soil in a treatment tank containing a first water level cleaning liquid to a degree that the contaminated soil is slurried;
Stirring means for separating the contaminated soil separated from the contaminated soil from the contaminated soil in the treatment tank containing the second level water cleaning liquid higher than the first water level by the contaminated soil treatment apparatus. A contaminated soil treatment system comprising: a contaminated soil treatment apparatus provided with a pollutant separation function unit. In a contaminated soil treatment method for washing contaminated soil containing pollutants,
In a treatment tank containing a first water level cleaning liquid to the extent that the contaminated soil is slurried,
And separating the pollutants present in the gaps of the contaminated soil from the contaminated soil in a treatment tank containing a cleaning liquid having a second water level higher than the first water level. Contaminated soil treatment method.

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