JP2005329338A - Polluted soil treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polluted soil treatment system capable of suppressing the deterioration of a circumferential environment caused by the leakage of an additive material. <P>SOLUTION: The polluted soil treatment system is equipped with a polluted soil treatment machine 2 equipped with an additive material supply device 27 for supplying an additive material for generating heat by the hydration reaction with moisture in soil to polluted soil, a mixer 24 for mixing the polluted soil with the additive material and a discharge device 25 for discharging the mixed soil obtained by mixer 24, a surrounding means 3 for surrounding an accumulation area for receiving the mixed soil of the polluted soil and the additive material from the discharge device 25 of the polluted soil treatment machine 2 to age the same and dust collectors 6 and 8 for collecting the dust leaked from the space between the additive material supply device 27 in the polluted soil treatment machine 2 and the mixer 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a purification system for soil contaminated with harmful substances, and more particularly to a contaminated soil treatment system capable of suppressing deterioration of the surrounding environment during treatment of contaminated soil.

  Volatile organic compounds (for example, so-called VOCs such as trichlorethylene and tetrachloroethylene) are generated from, for example, cleaning liquids for cleaning, cleaning liquids used in semiconductor manufacturing processes, oil cleaning liquids used in factories, etc. If this material leaks for some reason, it may contaminate the soil by natural infiltration or rainwater, and may further contaminate groundwater.

  In order to purify such contaminated soil, a soil treatment system equipped with a soil continuous supply device, a continuous mixing device, and a continuous discharge device is used to finely pulverize the soil mass containing harmful substances and continuously add the drug to it. Then, after mixing, the mixed soil is discharged and deposited in a reaction vessel covered with a hood, and a method of volatilizing and removing contaminants has been proposed (for example, see Patent Document 1).

JP 2000-334437 A

  The above-described method for volatilizing and removing harmful components contained in the soil uses the heat generated by the hydration reaction between the moisture in the soil and the lime-based additive to raise the temperature of the soil and remove the harmful components. Volatilization is removed. For this reason, as the amount of the additive added increases, the temperature of the soil rises, the volatilization efficiency of harmful components improves, and the purification efficiency improves.

  In recent years, with the increase in environmental preservation, the demand for early treatment of contaminated soil has increased rapidly, and the amount of treatment has also increased. When purifying such a large amount of contaminated soil, the amount of additive added to the soil increases in proportion to the amount of treated soil and the treatment time.

  On the other hand, as a machine for adding an additive to contaminated soil and mixing it, the soil treatment system shown in the above-mentioned known examples is generally used. In this soil treatment system, an attempt is made to cover the continuous discharge device with a cover in order to prevent scattering of dust and volatile components of harmful substances. However, in this type of soil treatment system, the step of dispersing the additive material includes the first step of adding the additive material to the contaminated soil, the second step of mixing the contaminated soil and the additive material, and the above-described continuous transportation. This is the third stage in which the mixed soil of the soil and additive is transported by the device. In particular, since the measures for preventing scattering in the first stage are not sufficiently taken, the additive is removed from this part. There arises a problem of scattering outside the processing system and deteriorating the surrounding environment.

  For this reason, it is conceivable to cover the entire soil treatment system with a cover, but in such a measure, a great amount of time and cost are required for the installation of the cover, the installation of exhaust equipment to the cover, and the removal work thereof. . Furthermore, since the entire soil treatment system in the cover becomes whitish due to the adhesion of the additive, there also arises a problem that the soil treatment system must be washed after the treatment work is completed.

  This invention is made | formed based on the above-mentioned matter, and it aims at providing the contaminated soil processing system which can suppress the deterioration of the surrounding environment by the leakage of an additive.

  In order to achieve the above object, the first invention is a contaminated soil treatment system for purifying contaminated soil, wherein the additive material generates heat due to a hydration reaction with moisture in the soil. A contaminated soil treatment machine comprising: an additive supply device that supplies the mixed soil; a mixing device that mixes the contaminated soil and the additive; and a discharge device that discharges the mixed soil mixed by the mixing device; and the contaminated soil treatment machine Leakage from the space between the surrounding means for enclosing the sedimentation site for receiving and curing the mixed soil of the contaminated soil and additive from the discharge device and between the additive supply device and the mixing device in the contaminated soil treatment machine The present invention is a contaminated soil treatment system including a dust trapping device that traps dust to be collected.

  Moreover, 2nd invention is a contaminated soil processing system which purifies contaminated soil, Comprising: The additive supply apparatus which supplies the additive which produces the heat | fever by the hydration reaction with the water | moisture content in this soil to the said contaminated soil A contaminated soil processing machine comprising: a mixing device for mixing the contaminated soil and the additive; and a discharging device for discharging the mixed soil mixed by the mixing device; and the contaminated soil from the discharging device of the contaminated soil processing machine Enclosing means for receiving and curing the mixed soil of the mixed material and the additive, and a dust trapping device for trapping dust leaking from the space between the outlet and the discharge device of the mixing device in the contaminated soil treatment machine And a contaminated soil treatment system.

  Further, according to a third invention, in the first or second invention, the dust trapping means includes a cover provided in the space, and a dust collecting pipe having one end opened in the cover and the other end connected to a dust collector. It is in the contaminated soil treatment system characterized by comprising.

  According to a fourth aspect of the present invention, in the first or second aspect, the dust capturing means includes a cover provided in the space, and an enclosure having one end opened in the cover and the other end connected to the dust collector. A contaminated soil treatment system is characterized by comprising a dust collecting pipe introduced into the means.

  According to the contaminated soil treatment system of the present invention, it is possible to capture dust including additives leaking from the contaminated soil treatment machine and suppress deterioration to the surrounding environment, so that it can be applied at treatment sites where humans are adjacent. Is possible.

DESCRIPTION OF EMBODIMENTS Embodiments of a contaminated soil treatment system and a contaminated soil treatment method of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a contaminated soil treatment system according to the present invention. In FIG. 1, 1 is an excavator for excavating and transferring contaminated soil to be purified, and 2 is a lime system for contaminated soil. The soil processing machine 3 for mixing the additive material is an enclosing means for enclosing the deposition site for receiving and curing the mixed soil A discharged from the carry-out conveyor (described later) of the soil processing machine 2. It consists of a structure of format. The surrounding means 3 is provided to promote volatilization of volatile organic components in the contaminated soil by heat generated by a hydration reaction between the moisture in the contaminated soil and the additive. Reference numeral 4 denotes a deodorizing device having a dust collecting function for collecting volatile organic components and dust generated in the surrounding means 3.

  2 shows a detailed configuration of the soil treatment machine 2 shown in FIG. 1. In FIG. 2, 20 is a main body, 21 is an endless track type traveling body provided in the main body 20, and 22 is a longitudinal direction of the main body 21. A sieving device provided on one side for receiving and sieving contaminated soil from the excavator 1, a carry-in conveyor provided in the main body 21 so as to be positioned below the sieving device 22, and 24 in the longitudinal direction of the main body 21 This mixing device 24 is a mixing device provided in the center, and the contaminated soil and the additive are mixed with stirring to form mixed soil. A transport conveyor 25 is provided in the main body 20 so as to be positioned below the mixing device 24. The transport conveyor 25 discharges the mixed soil A discharged from the mixing device 24 to the surrounding means 3. 26 is an additive storage device provided in the main body 21 so as to be positioned on the mixing device 24, 27 is an additive supply device provided below the additive storage device 26, and its supply port is on the carry-in side of the carry-in conveyor 23. Is located. Reference numeral 28 denotes a prime mover provided on the main body 21.

  FIG. 3 shows an enlarged connection portion between the inlet side and the outlet side of the mixing device 24 constituting the soil treatment machine 2, and in this figure, the same reference numerals as those in FIG. 2 are the same portions. The mixing device 24 is rotatable within the main body 29, a carry-in port 30 provided in the upper portion of the main body 29 on the carry-in conveyor 23 side, a carry-out port 31 provided in the lower portion on the carry-out conveyor 25 side of the main body 28, and the main body 29. It is comprised with the stirring blade 32 provided.

  Reference numeral 5 denotes a cover that covers a connection portion of the carry-in port 30, the additive supply device 27, and the carry-in conveyor 23 of the mixing device 24. Reference numeral 6 denotes a dust collecting pipe for taking in dust generated in the cover 5. One end of the dust collecting pipe 6 is attached to the cover 5 so as to be located in the cover 5, and the other end has the dust collecting function shown in FIG. It has connected with the deodorizing apparatus 4 which has.

  Reference numeral 7 denotes a skirt provided at the carry-out port 31 of the mixing device 24 so as to cover the space between the carry-out port 31 of the mixing device 24 and the carry-out conveyor 25. 8 is a dust collection pipe for taking in dust generated in the carry-out port 31 and the skirt 7. One end of the dust collection pipe 7 is attached to the carry-out port 31 so as to open to the carry-out port 31, and the other end is the dust collection function described above. It connects with the deodorizing apparatus 4 which has.

Next, operation | movement of one Embodiment of the contaminated soil processing system of this invention mentioned above is demonstrated.
The excavator 1 shown in FIG. 1 excavates the contaminated soil accumulated at the treatment site, and the excavated contaminated soil is put into the sieve device 22 of the soil treatment machine 2. The contaminated soil that has passed through the sieving device 22 falls onto the carry-in conveyor 23 and is conveyed to the mixing device 24 side by the carry-in conveyor 23. In the middle of this conveyance, the additive material is supplied and added from the additive material supply device 27 to the contaminated soil 1 and transferred to the mixing device 24. The mixing device 24 receives and stirs and mixes the contaminated soil and the additive so that the thermal reaction between the additive and the moisture in the contaminated soil is promoted. The mixed soil of the mixed additive material and the contaminated soil is discharged from the mixing device 24 to the carry-out conveyor 25.

  The carry-out conveyor 25 discharges and deposits the received mixed soil in the surrounding means 3. The mixed soil is placed in a curing state for volatilizing volatile organic components contained in the contaminated soil by the hydration reaction between the moisture in the contaminated soil and the additive in the surrounding means 3. Thereafter, the soil from which the volatile organic component has been volatilized is carried out of the surrounding means 3 for use as improved soil.

  During the above-described contaminated soil treatment operation, the generated sand and additive dust at the connecting portion between the inlet side and the outlet side of the mixing device 24 are temporarily captured by the cover 5 and the skirt 7, respectively, and then collected. It is collected by the deodorizing device 4 having a dust collecting function through the dust tubes 6 and 8. Thereby, since the leakage of the dust from the soil treatment machine 2 can be suppressed, the surrounding environmental deterioration can be prevented. Moreover, since the adhesion of the dust to the soil treatment machine 2 can be prevented, the washing work of the soil treatment machine 2 after the treatment work becomes unnecessary.

  In the above-described embodiment, the exhaust side of the dust collection tubes 6 and 8 is connected to the deodorizing device 4 having a dust collection function, but the exhaust side of the dust collection tubes 6 and 8 is introduced into the surrounding means 3. It is also possible to configure so that the dust is discharged into the surrounding means 3 and collected by the deodorizing device 4 having a dust collecting function. This embodiment is effective when the dust collection tubes 6 and 8 cannot be disposed up to the deodorizing device 4 described above.

  In the above-described embodiment, the exhaust side of the dust collection tubes 6 and 8 is connected to the deodorizing device 4 having a dust collection function, but the exhaust side of the dust collection tubes 6 and 8 is connected to the vicinity of the soil treatment machine 2. It is also possible to connect to the air intake fan installed on the ground, and to connect the exhaust side of the air intake fan to a dust collector installed in the vicinity of the soil treatment machine 2. It is also possible to connect to an intake fan installed in the vicinity of the soil treatment machine 2 and connect the exhaust side of the intake fan to the surrounding means 3.

  Furthermore, in the above-described embodiment, the cover 5 and the skirt 7 are provided at the connection portion between the inlet side and the outlet side of the mixing device 24, respectively, and dust is collected from these portions. The cover 5 and the skirt 7 are removed, and one end of the dust collecting pipes 6 and 8 is arranged at the connecting portion between the inlet side and the outlet side of the mixing device 24, and the other end is the deodorizing device 4 having the dust collecting function as described above. In addition, the other ends of the dust collecting pipes 6 and 8 are connected to an intake fan installed near the soil treatment machine 2, and an exhaust side of the intake fan is connected to a dust collector installed near the soil treatment machine 2. Further, the other ends of the dust collecting pipes 6 and 8 are connected to an intake fan installed in the vicinity of the soil treatment machine 2, and the exhaust side of the intake fan is connected to the surrounding means 3. It is also possible to connect and configure.

  Further, in the above-described embodiment of the present invention, the cover 5 and the skirt 7 are provided at the connection portion between the inlet side and the outlet side of the mixing device 24, and dust is collected from these portions. In some cases, it is possible to omit the dust trapping device provided at the connecting portion on the outlet side of the mixing device 24.

  Moreover, in this invention, it is possible to use the soil treatment machine 2 of a format different from the thing of the soil treatment machine 2 shown in FIG. As this soil treatment machine 2, for example, as shown in FIG. 4, the gantry 2A, the conveyor 2B provided on the gantry 2A, the hopper 2C provided on one side of the conveyor 2B, and the conveyor 2B are arranged. The additive material storage device 2D, a screw-type feeder 2E provided in the lower part of the additive material storage device 2D, and a crusher 2F having a mixing function provided in the conveyor 2B are configured. This soil treatment machine 2 is effective when treating contaminated soil with a low content of volatile organic components, or when the treatment place is in a narrow area. By disposing the other end of the dust collecting pipe 6 connected to the dust collector in the vicinity of the feeder 2E and arranging the other end of the dust collecting pipe 8 having one end connected to the dust collector, for example, in the vicinity of the crusher 2F. Dust scattering can be similarly suppressed.

  According to the contaminated soil treatment system of the present invention, it is possible to capture dust containing additives leaking from the contaminated soil treatment machine and suppress deterioration to the surrounding environment. Is possible. Further, along with this, it becomes unnecessary to transfer the contaminated soil to a treatment site away from a house or the like, and the treatment efficiency can be improved and the treatment cost can be reduced.

It is a front view showing one embodiment of the soil treatment system of the present invention. It is a front view which expands and shows the soil treatment machine used for one embodiment of the soil treatment system of this invention. It is a front view which expands and shows the mixing apparatus part of the soil treatment machine used for one embodiment of the soil treatment system of this invention. It is a front view which shows the other example of the soil treatment machine used for the soil treatment system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Soil treatment machine 3 Surrounding means 4 Deodorizing device 24 which has a dust collection function 24 Mixing device 25 Conveyor 26 Additive storage device 27 Additive supply device 5 Cover 6 Dust collection tube 7 Skirt 8 Dust collection tube

Claims (4)

  A contaminated soil treatment system for purifying contaminated soil, comprising: an additive supply device that supplies the contaminated soil with an additive that generates heat due to a hydration reaction with moisture in the soil; and the contaminated soil and additive A contaminated soil treatment machine provided with a mixing device for mixing the mixed soil and a discharge device for discharging the mixed soil mixed with the mixing device, and a mixed soil of the contaminated soil and additive from the discharge device of the contaminated soil treatment machine Characterized in that it comprises an enclosing means for enclosing a deposition site to be received and cured, and a dust trapping device for trapping dust leaking from a space between the additive supply device and the mixing device in the contaminated soil treatment machine. Contaminated soil treatment system.   A contaminated soil treatment system for purifying contaminated soil, comprising: an additive supply device that supplies the contaminated soil with an additive that generates heat due to a hydration reaction with moisture in the soil; and the contaminated soil and additive A contaminated soil treatment machine provided with a mixing device for mixing the mixed soil and a discharge device for discharging the mixed soil mixed with the mixing device, and a mixed soil of the contaminated soil and additive from the discharge device of the contaminated soil treatment machine Characterized in that it comprises an enclosing means for enclosing a deposition site to be received and cured, and a dust trapping device for trapping dust leaking from a space between a carry-out port and a discharge device of the mixing device in the contaminated soil treatment machine. Contaminated soil treatment system.   The contamination according to claim 1 or 2, wherein the dust trapping means comprises a cover provided in the space, and a dust collection pipe having one end opened in the cover and the other end connected to a dust collector. Soil treatment system.   The dust trapping means comprises a cover provided in the space, and a dust collecting pipe introduced into an enclosing means having one end opened in the cover and the other end connected to a dust collector. Item 3. The contaminated soil treatment system according to item 1 or 2.

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