JPH10263521A - Reforming treatment of contaminated soil and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To penetrate a treating chemical soln. down into the deep part of surplus soil grains and to reform contaminated soil by transferring the surplus soil disintegrated to a finely agglomerated granular form by a disintegrating machine while vibrating the surplus soil by a vibration transporting means which is formed to a trough shape and is vibrated by a vibration applying means, then spraying the surplus soil with the treating chemical soln. to a mist form. SOLUTION: The surplus soil disintegrated by the disintegrating machine is charged little by little from the inside of a conveyor 1 onto a vibration plate 2. The vibration plate 2 is vibrates a supporting frame 14 by a vibration generator 3 which is driven to be activated by a driving source 4. The vibration is applied on the vibration plate 2 by means of an intermediate spring 15. The surplus soil grains of the surface are rolled and are moved in this rolling state by the vibration of the trough-shaped vibration plate 2 and the chemical soln. from a spraying nozzle 5 is uniformly, sprayed onto the surface, by which the surplus soil is treated. The surplus soil is thereafter dropped and discharged from the discharge end of the vibration plate 2. As a result, the chemical soln. is eventually penetrated down into the deep part of the surplus soil grains to effect reaction, by which the quality of the surplus soil is improved and the recycling of the surplus soil is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for modifying soil contaminated soil by exposing soil excavated from a site of a factory or the like to a chemical which can be used as a reusable soil.

[0002]

2. Description of the Related Art When soil excavated from a site of a factory or the like (hereinafter referred to as residual soil) is contaminated with harmful substances and the like, a chemical such as a power shovel or the like is used to disintegrate the soil while crushing the soil. Was sprayed to perform the treatment.
In this case, the contaminated soil is a relatively large lump, and the treatment chemicals do not penetrate deep into the lump, making it difficult to react with all the harmful substances in the lump, which tends to result in incomplete treatment. Was.

[0003]

SUMMARY OF THE INVENTION It has been extremely difficult for conventional methods to achieve soil environmental standards for residual soil contaminated with harmful substances. An object of the present invention is to provide a contaminated soil reforming method capable of infiltrating a treatment chemical solution to a deep portion of a residual soil grain, modifying contaminated soil, and obtaining reusable soil. Other issues are:
An object of the present invention is to provide a contaminated soil reforming treatment apparatus capable of obtaining a reusable soil by treating a disintegrated residual soil with a chemical solution using a simple device.

[0004]

Means for Solving the Problems The object of the present invention is to provide:
In a soil treatment method in which the remaining soil of a site such as a factory is chemically treated in order to reuse the remaining soil, the excavated remaining soil is crushed into fine chunks by a crusher and vibrated by vibration imparting means. The falling position is raised, the discharging position is lowered and inclined, and the crushed residual soil is dropped on the gutter-shaped vibrating conveyance means. The remaining soil is transferred while being vibrated on the vibrating conveying means, and is processed. This can be achieved by a structure in which a chemical solution is sprayed and the remaining soil is modified. Further, the fine lump granular soil supplied on the vibrating conveying means is transferred on the vibrating conveying means while leveling and vibrating the surface with a scraper, and the remaining soil is reformed while spraying the treatment liquid. The above object can also be achieved by doing so.

[0005] Further, a transfer means for dropping fine-grained granular soil that has been crushed by the crusher, and a vibrating conveyance means for transferring the remaining soil on the surface to the deposition site while vibrating the remaining soil dropped from the transfer means as a whole. A chemical spraying means for spraying a chemical solution onto the surface of the fine residual soil during the transportation by the vibration transportation means, and spraying a chemical solution onto the remaining soil while being transported by the vibrating transportation means which is vibrating as a whole; The above object can be achieved by sufficiently infiltrating the residual soil particles deeply and modifying the residual soil. In addition, the upper side of the vibrating conveyance means is formed by surrounding it with a shielding wall, and a sprayer having at least one spray nozzle is arranged inside the ceiling, and a scattering prevention means is applied to a carry-in port and a carry-out port, and a chemical solution is provided. Even if an enclosure for spraying a chemical solution for preventing scattering to the outside is provided, the above problem can be sufficiently achieved. A plurality of the scrapers disposed on the vibrating / conveying means are fixedly or rotatably disposed, and the scraper sufficiently penetrates a chemical solution to a deep portion of the remaining soil particles transferred while the thickness on the vibrating / conveying means is equalized. This can be achieved by the configuration of the contaminated soil reforming treatment apparatus characterized in that:

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a method of modifying contaminated soil according to the present invention, contaminated soil remaining after being crushed by a crusher is transferred while vibrating on a vibrating conveying means such as a vibrating plate, and a chemical solution is sprayed on the surface thereof. Then, the chemical solution is sufficiently penetrated into the deep portion of the residual soil particles, so that the quality of the contaminated soil can be improved by a simple method. The treated soil is detoxified of contaminants, reformed and reused. In particular, the residual soil is crushed by a crusher, and the remaining soil is caused to flow down onto the vibration transporting means, and is exposed to the chemical solution for a predetermined time until it is discharged on the vibration transporting means. As a result, the chemical liquid sufficiently penetrates deep into the residual soil particles, and the chemical treatment of the contaminants in the residual soil particles can be performed. Further, the vibration makes it easier for the chemical solution to penetrate.

Further, since a scraper is arranged to make the remaining soil dropped between the loading position and the unloading position of the vibration transfer means uniform, the entire remaining soil thickness is uniform, and the remaining soil particles are converted into the chemical solution. By immersion, the contaminated soil can be modified. The vibration conveying means of the method for contaminated soil reforming of the present invention increases the input side of the residual soil and forms the discharge side low,
Since the vibration conveying means is vibrated, the remaining soil moves to the discharge side. The surplus of the chemical in the chemical spraying means flows to the carry-out side, and is suitable for processing the remaining soil particles. Further, a belt conveyor or a large shovel may be used as a transfer means for dropping the remaining soil crushed by the crusher. Any means can be used as long as it can be dropped little by little onto the vibration conveying means by these transfer means. In addition, it is also possible to drop the remaining soil dropped from a belt conveyor or the like into the hopper and then drop it. It is more effective to arrange a vibrating sieve in the hopper to remove the residual soil particles having a size of 5 mm or more, and the quality improvement treatment can be sufficiently performed.

A contaminated soil reforming treatment apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view of one embodiment of a contaminated soil reforming treatment apparatus of the present invention. FIG. 2 is a schematic explanatory view of another embodiment of the contaminated soil reforming treatment apparatus of the present invention. FIG. 3 is a schematic explanatory view of another embodiment of the contaminated soil reforming treatment apparatus of the present invention. FIG. 4 is a schematic explanatory view of another embodiment using a vibration conveyor.

Reference numeral 1 denotes a conveyor for transferring the remaining soil, which drops contaminated soil crushed by a crusher (not shown) onto a vibrating plate 2 serving as a vibration conveying means. The vibrating plate 2 is formed in a gutter shape so that the remaining soil particles roll. The vibrating plate 2 is supported by a support frame 14 vibrated by the vibration generating device 3 via an intermediate spring 15. Reference numeral 4 denotes a drive source of the vibration generator 3. 5
Reference numeral denotes a spray nozzle which communicates with the chemical solution tank 6 via a supply pipe 8 via a liquid sending pump 7. Numeral 9 is a chemical spraying room surrounded by a side wall, in which a shielding cloth 10, for example, a vinyl curtain, which is a scattering prevention means, is suspended at the opening on both sides, and the spray nozzle 5 is arranged downward on the ceiling wall. This shielding cloth 10 is 20
Many shielding cloths 10 having a width of about 30 cm may be arranged, and the shielding cloths 10 may be arranged in a plurality of rows.

[0010] A plurality of scrapers 11 are provided to scrape remaining soil such as crushed contaminated soil on the vibrating plate 2 to a uniform thickness, and a plurality of scrapers are arranged to transfer the remaining soil. The scraper 11 is a comb-shaped rotating body, and it is particularly preferable that the scraper 11 has a built-in elastic member to be stretchable. The rotation speed is lower than the moving speed of the residual soil transferred by the vibration of the vibration plate 2. Reference numeral 12 denotes a conveyor with a transporting piece, which has a large number of scraper pieces on its surface, and its moving speed is also slower than the transferring speed of the residual soil on the vibrating plate 2. Reference numeral 13 denotes a vibrating conveyor, on the upper side of which is provided a chemical spraying chamber 9 for spraying a chemical onto the residual soil that has fallen on the surface. The moving speed of the vibrating conveyor 13 is a speed at which the chemical liquid permeates deep into the remaining soil on the surface.

A method for modifying contaminated soil according to the present invention will be described. The remaining soil of contaminated soil excavated from the factory site or the like is crushed by a generally known crusher or the like, and the crushed remaining soil is dropped onto the vibrating plate 2 little by little by a large shovel or a conveyor. The dropped residual soil particles are rolled and transferred on the vibration plate 2 by the degree of inclination and vibration of the vibration plate 2.
At this time, the degree of inclination and the frequency are adjusted according to the type of the remaining soil. Further, the vibration may be applied intermittently. On the vibrating plate 2, the chemical solution is sprayed from the chemical solution tank 6 through the supply pipe 8 by the liquid sending pump 7 from the spray nozzle 5 to the surface of the residual soil particles. The ejection amount of the chemical is adjusted according to the type of the contaminated soil and the degree of contamination. The length or the conveying speed of the vibrating plate 2 is also set according to the type of the contaminated soil, and if necessary, several vibrating plates 2 can be arranged and processed.

In the method for modifying contaminated soil according to the present invention, the falling position of the remaining soil is set at a high position, the discharge side is lowered, the whole is inclined, and the remaining soil is rolled and transferred.
Occupied area can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1, a contaminated soil reforming apparatus of the embodiment shown in FIG. The vibrating plate 2 had a length of 7 m, a conveying speed of 10 to 20 m / min, and used a chemical solution mainly composed of ferrous sulfate. This chemical is injected from the spray nozzle 5. The residual soil particles cured and discharged on the vibrating plate 2 were penetrated by a chemical solution, and contaminants and the like were changed to insoluble metal salts. The quality of the residual soil was improved, and the soil became reusable soil.

The contaminated soil reforming treatment apparatus shown in FIG. 1 will be described. The remaining soil crushed by the crusher is dropped onto the vibrating plate little by little from inside the conveyor 1. The vibration generating device 3 is operated by the driving of the driving source 4 to vibrate the support frame 14, and the vibration plate 2 vibrates the vibration plate 2 via the intermediate spring 15. Due to the vibration of the gutter-shaped vibrating plate 2, the residual soil particles on the surface move while rolling, and the chemical solution from the spray nozzle 5 is uniformly sprayed and treated on the surface, and the residual soil falls from the discharge end of the vibrating plate 2. Discharge. The chemical solution penetrates deep into the remaining soil particles to improve the quality, and the remaining soil can be reused. As shown in FIG. 2, the surface of the soil moved by the vibrating plate 2 is arranged by a plurality of rotating scrapers 11 so that the remaining soil on the vibrating plate 2 is leveled at the same time and the remaining soil is transferred on the vibrating plate 2. I do. This scraper 11
May be arranged in plural numbers, or the spray nozzle 5 sprays the chemical solution on the surface of the residual soil.

The contaminated soil reforming treatment apparatus shown in FIG. 3 will be described. The contaminated soil, which is crushed by the crusher, is dropped onto the vibrating plate 2 little by little by the conveyor 1. This is an embodiment in which the remaining soil is transferred by a conveyor 12 with a conveying piece in which scrapers 11 are arranged at predetermined intervals on a conveying path of a vibrating plate 2. The remaining soil moves while the surface is leveled by the scraper 11.

FIG. 4 shows an embodiment in which a vibrating conveyor 13 is used in place of the vibrating plate 2, and the remaining soil dropped from the conveyor 1 is transferred by the vibrating conveyor 13, and the surface of the remaining soil is leveled by vibration. Moving.
The moving speed of the remaining soil is controlled by adjusting the inclination angle according to the type of the remaining soil. A chemical spraying chamber 9 is arranged near the falling position of the residual soil, and a plurality of spray nozzles 5 of the chemical spraying chamber 9 are arranged in a supply pipe 8 arranged in the ceiling wall. Chemical spray room 9
The remaining conveyed soil particles may be further leveled. The remaining soil particles are carried into the chemical spraying chamber 9 and are exposed to the chemical solution ejected from the spray nozzle 5, and the excess chemical solution is contaminated with the remaining soil while flowing down the inclined vibration plate 2. The chemical solution penetrates deep into the residual soil particles to improve the contaminated soil.

In the contaminated soil reforming treatment apparatus of the present invention, it is more effective to increase the distance from the chemical spraying chamber 9 to the end of the vibration plate 2.

[0018]

The contaminated soil reforming method of the present invention is a simple method of spraying a chemical solution while transferring the remaining soil by a vibrating conveyance means such as a vibrating plate or the like. The quality of the soil can be improved and the whole device can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of one embodiment in which a vibrating plate is used as a vibrating conveyance means of a contaminated soil reforming treatment apparatus of the present invention.

FIG. 2 is a schematic explanatory view of another embodiment of the contaminated soil reforming treatment apparatus of the present invention.

FIG. 3 is a schematic explanatory view of another embodiment of the contaminated soil reforming treatment apparatus of the present invention.

FIG. 4 is a schematic explanatory view of another embodiment in which a vibration conveyor is used as the vibration conveying means of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Conveyer 2 ... Vibration plate 3 ... Vibration generator 4 ... Driving source 5 ... Spray nozzle 6 ... Chemical tank 7 ... Sending pump 8 ... Supply pipe 9 ... Chemical spraying room 10 ... Shielding cloth 11 ... Scraper 12 ... With transport piece Conveyor 13 ... Vibration conveyor 14 ... Support frame 15 ... Intermediate spring

Claims (5)

[Claims] 1. A soil treatment method for chemically treating residual soil on a site such as a factory in order to reuse the residual soil, wherein the excavated residual soil is crushed into fine chunks by a crusher and vibrated by vibration applying means. The falling position of the residual soil is raised, the discharge position is lowered and inclined, and the crushed residual soil is dropped on a vibrating conveyance means formed in a gutter shape, and the remaining soil is transferred while being vibrated on the vibration conveying means. A method for modifying contaminated soil, characterized by spraying a treatment solution onto the remaining soil in a spray form to reform the remaining soil. 2. A fine-grained granular soil supplied onto the vibration conveying means is transferred on the vibration conveying means while leveling and vibrating the surface with a scraper. The method of claim 1, wherein the soil is modified. 3. A soil treatment method for chemically treating residual soil on a site such as a factory in order to reuse the residual soil, comprising: transferring means for dropping fine-grained granular residual soil crushed by a crusher; A vibrating conveying means for transferring the surplus soil on the surface to the deposition site while vibrating the fallen surplus soil as a whole, and a chemical spraying means for spraying a chemical solution on the surface of the fine surplus soil during conveyance by the vibrating conveying means, Contaminated soil reforming characterized by spraying a chemical solution onto the remaining soil while being transferred by the vibrating conveying means vibrating as a whole, and allowing the treatment chemical to sufficiently penetrate into the deep portion of the remaining soil particles to reform the remaining soil. Processing equipment. 4. A vibrating / conveying means is formed so as to be surrounded by a shielding wall, and a sprayer having at least one spray nozzle is disposed inside the ceiling, and scattering prevention means are provided at a carry-in port and a carry-out port. The contaminated soil reforming treatment apparatus according to claim 3, wherein the applied chemical liquid is prevented from scattering outside. 5. A plurality of scrapers disposed on the vibrating / conveying means are fixedly or rotatably disposed, and a chemical solution is provided to the deep portion of the residual soil particles which are conveyed while the thickness on the vibrating / conveying means is equalized by the scrapers. 5. The contaminated soil reforming treatment apparatus according to claim 3, wherein the soil is sufficiently permeated. 6.