JP2013240746A - Method and apparatus for eliminating contaminated substance contained in agricultural soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively carry out elimination of contaminated substances such as radioactive substances or heavy metals contained in agricultural soil with a little labor.SOLUTION: Water is supplied to a farmland, a soil pudding machine 3 is mounted on a tractor 2, a suction nozzle 4 is arranged in a posterior part in an advancing direction of the tractor 2 more than the soil pudding machine 3, the distal end part 23 of the suction nozzle 4 is arranged below a surface of a water and above the soil pudding bottom surface, the tractor 2 is made run, turbid water containing soil particles is sucked up by a suction nozzle 4 while agitating the soil of the farmland by the soil pudding machine 3.

Description

  The present invention relates to a pollutant removal method and a removal apparatus for removing radioactive substances and heavy metals contained in farmland soil.

  Radioactive materials such as radioactive cesium have been released into farmland soil due to the accident at the nuclear power plant caused by the Great East Japan Earthquake, and removal of radioactive materials is an urgent issue in order to keep the farmland soil, which is the foundation of food production, safe. It has become.

  Therefore, the Ministry of Agriculture, Forestry and Fisheries presents, in Non-Patent Document 1, a method for removing (decontaminating) radioactive substances from farmland soil, such as a procedure for “soil agitation / removal with water”.

  The soil agitation / removal with water is a method in which the surface soil of the paddy field is agitated in water, and muddy water containing soil particles is solid-liquid separated to remove radioactive substances contained in the soil. The main procedure is as follows. It is.

  First, water is supplied to the field of the decontamination area to a height of about 10 cm from the original ground surface. Next, the soil is agitated to a depth of 5 cm from the original ground surface with a scraper attached to the tractor, and when the agitation is finished, turbid water containing soil particles is pumped up.

  At this time, only forced drainage by the pump has few soil components that are mixed and mixed with muddy water, and a sufficient decontamination effect cannot be obtained. Extruding work is being done.

Ministry of Agriculture, Forestry and Fisheries Manual of Radioactive Substance Removal Technology (Decontamination Technology) for Farmland Soil 1st Edition March 2012 http://www.s.affrc.go.jp/docs/press/pdf/120302-01. pdf

  However, in the decontamination method of Non-Patent Document 1, turbid water containing soil is manually sent to the pump side using bamboo shoots, PVC pipes, and the like, so that the labor burden on the worker is large and the efficiency is poor. Moreover, due to sedimentation of soil particles, the amount of soil particles sucked up as turbid water is insufficient, and a sufficient decontamination effect cannot be obtained.

  An object of the present invention is to efficiently remove contaminants such as radioactive substances and heavy metals contained in farmland soil with less labor.

  In order to solve the above-mentioned problem, the present invention supplies water to farmland, a tractor is equipped with a scraper, a suction nozzle is arranged behind the scraper in the traveling direction of the tractor, and the tip of the suction nozzle Is placed below the surface of the water and above the bottom surface of the shaving, the tractor is run, and the turbid water containing soil particles is sucked up by the suction nozzle while the soil of the farmland is stirred by the shaving machine. The present invention provides a method for removing pollutants contained in agricultural soil.

  The tip of the suction nozzle may have a diameter that increases from the tube to the tip. Moreover, you may suck up the said muddy water from the side of the front-end | tip part of the said suction nozzle. Or the front-end | tip part of the said suction nozzle may be curved and the said muddy water may be sucked in into the said suction nozzle from the side or upper direction of the front-end | tip of the said suction nozzle.

  Further, among the soil particles contained in the turbid water sucked up by the suction nozzle, coarse particles exceeding a predetermined size are classified by a cyclone, and a flocculant is added to the water from which the coarse particles are removed to add the remaining soil particles. The soil particles and water may be separated by precipitation. The contaminant may be a heavy metal or a radioactive substance.

  Further, according to the present invention, there is provided a pollutant removing device used in the method for removing pollutants contained in the farmland soil, wherein the tractor is equipped with a surrogator, and the traveling direction of the tractor is more than the surrogator. A device for removing contaminants contained in farmland soil is provided, characterized in that a suction nozzle is disposed at the rear. The suction nozzle includes a nozzle portion attached to the tractor, a suction device, and a hose connecting them, and the nozzle portion and the hose are clamps that are rotatable according to the movement of the tractor. It is preferable that they are connected.

  According to the present invention, it is possible to efficiently recover fine particles having a high ratio of contaminants such as radioactive substances, among soil particles, and to efficiently remove many contaminants from a small amount of waste. The volume of goods can be reduced. Furthermore, it can be manufactured at a low cost with a simple structure, and the number of labors can be reduced.

It is a perspective view which shows the example of the contaminant removal apparatus concerning this invention. It is a front view which shows the example of the suction nozzle of FIG. It is a graph which shows the relationship between the particle size division of a soil, and a weight distribution rate. It is a graph which shows the relationship between the particle size division of a soil, and radioactivity. It is a bottom view of the front-end | tip of the suction nozzle of FIG. It is a side view explaining the arrangement height of a suction nozzle. It is a graph which shows the weight ratio for every particle size division of the collection | recovery soil particle by the arrangement | positioning height of a suction nozzle, and the stirring speed of a scraper. It is a front view which shows the example from which the suction inlet of the suction nozzle front-end | tip differs. It is a front view which shows the further different example of the suction inlet of a suction nozzle front-end | tip. It is a front view which shows the further different example of the suction inlet of a suction nozzle front-end | tip. It is a block diagram which shows the example of the equipment which implements the removal method of the pollutant concerning this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of the removal apparatus of the present invention. The removal device 1 includes a tractor 2 on which the scraper 3 is mounted, and a suction nozzle 4 attached to the rear side of the tractor 2 in the traveling direction of the scraper 3. The suction nozzle 4 has a plurality of rows along the width direction of the scraper 3, for example, a nozzle portion 12 having three rows of cylinders 11 as shown, a hose 13 connected to the nozzle portion 12, and a tip of the hose 13. And a suction device 14 connected to the. The suction device 14 is preferably a vacuum vacuum capable of continuous suction and discharge, and for example, a suction device having a suction capacity of 0.2 to 0.3 m ³ / min is used. The nozzle portion 12 and the hose 13 are connected by a rotatable clamp 15, and the clamp 15 rotates according to the moving direction of the tractor 2, thereby preventing the hose 13 from being twisted when the tractor 2 travels.

  FIG. 2 shows an example of the nozzle unit 12. Each of the three rows of cylinders 11 has a different diameter socket 22 attached to the lower end portion of the pipe portion 21 made of, for example, a φ40 mm PVC pipe, and the inner diameter expands to, for example, 100 mm toward the front end. Yes. A suction port 23 is further provided at the tip of the different diameter socket 22. On the upper side of the pipe part 21, a different diameter socket 24 which is a little larger than the diameter of the pipe part 21 and expands to 50 mm, for example, is attached, and on the upper side, a second pipe part 25 of φ50 mm is connected. The respective second pipe portions 25 of the three cylinders 11 are connected via joints 26a, 26b, 26c, and the like, and further, from the connection part, via the cheese joint 27, the cam lock coupler 28, etc. 1 is connected to the hose 13 shown in FIG. Although FIG. 2 shows an example of the nozzle unit 12, such a nozzle unit 12 can be manufactured at low cost by using a commercially available general-purpose material, and this can be used as an existing tractor 2 equipped with the scraper 3. If it is attached, it can be carried out easily and inexpensively by ordinary farmers.

  FIG. 3 shows the weight distribution rate of soil by particle size classification, and FIG. 4 shows the relationship between particle size classification and radioactivity. FIG. 4 shows that particles having a small particle size have a lot of radioactivity. And as shown in Table 1, 82% of the whole radioactivity was contained in the particle | grains of 0.075 mm (75 micrometers) or less which is 37 weight% of the whole soil. That is, if only fine particles of 75 μm or less are collected, the radiation removal effect can be efficiently obtained by treating the soil with a small weight.

  Therefore, the diameter of the tube portion 21 of the nozzle portion 12 is set to a thickness that does not make the flow rate at the time of suction excessively high in order to suck up muddy water containing fine particles having a predetermined size or less. In the present embodiment, from the results of FIG. 4 and Table 1 described above, the diameter and suction force of the tube portion 21 are set by, for example, the Stokes equation so as to suck up turbid water containing fine particles of 75 μm or less among the soil particles. . Further, the tip portion of the nozzle portion 12 is formed in a trumpet shape in which the tip is widened by the different-diameter socket 22, thereby suppressing the suction speed of the tip portion so that coarse particles are not easily sucked.

  Further, the suction port 23 at the lower end of the nozzle portion 12 has a cross-shaped bolt 31 as shown in FIG. 5, for example, as shown in FIG. 5, so as not to suck in coarse plant residues or weeds remaining in the field to block the hose 13 or the like. You may arrange in.

In the case of using the removing device 1 as described above, within the range in which the work is performed, stirring is performed by the scraper 3 to about 150 mm below the original ground G ₀ of the field, and about 250 mm with respect to the original ground G ₀ . upper, i.e. it is possible to supply water to 400mm about upwardly relative puddling bottom _{G 1.} At this time, the depth of the tip of the nozzle portion 12 is preferably 200 mm to 300 mm below the water surface as shown in FIG. 6. If the position of the tip of the nozzle part 12 is too close to the water surface, depending on the unevenness of the field, the tip of the nozzle part 12 may come out above the water surface and inhale air. On the other hand, if the position of the nozzle portion 12 is too deep, the tip contacts the soil and the coarse particles are also sucked, and the turbid water containing fine particles cannot be sucked efficiently. Moreover, it is preferable to suck the turbid water at a timing at which fine particles in the turbid water generated by stirring with the scraper 3 do not settle. For this purpose, the nozzle portion 12 is arranged close to the scraper 3. That is, if the tip of the nozzle portion 12 is disposed close to the rear of the scraper 3 with respect to the traveling direction of the tractor 2, the turbid water immediately after being stirred by the scraper 3 is sucked when the tractor 2 travels. Can do.

The position of the water surface of the nozzle portion 12 tip, and two 200mm lower position than the water surface (puddling 200mm above the bottom surface _{G 1),} 300 mm lower than the water surface (puddling 100mm above the bottom), puddling machine 3 When the rotation speed of stirring was low and high, the particle size distribution of the soil sucked by the suction nozzle 4 and the amount of dry soil were measured, and the results shown in Table 2 and FIG. 7 were obtained.

  As shown in FIG. 7, the weight ratio of fine particles of 0.075 mm (75 μm) or less in the collected soil did not vary depending on the distance from the water surface at the tip of the nozzle portion 12 of the suction nozzle 4. However, as shown in Table 2, the amount of collected soil particles increased about 1.7 times by suctioning 300 mm below the water surface as compared to 200 mm below the water surface. Accordingly, the tip of the nozzle 11 is preferably deeper than the water surface.

  FIG. 8 shows examples of different shapes of the suction port at the tip of the nozzle portion 12. The suction port 23a has a bottom surface 32 closed and an opening 33 provided on a side surface. A plurality of openings 33 may be provided in the circumferential direction. By providing the opening 33 on the side surface in this manner, fine particles floating in water are sucked into the nozzle portion 12, and coarse particles that are likely to settle are less likely to be sucked.

  Moreover, FIG. 9 and FIG. 10 show still another example of the shape of the suction port. The suction port 23b shown in FIG. 9 has a shape curved by 90 ° so that the opening 34 at the tip is directed in the vertical direction, and the suction port 23c shown in FIG. 10 has a shape curved by 180 ° so that the opening 35 faces upward. It is. In either case, the coarse particles 41 that sink to the bottom of the ground are difficult to be sucked, and the fine particles 42 that are floating in water are sucked.

  FIG. 11 shows the entire contaminant removal system in which the turbid water treatment system is incorporated in the removal apparatus 1 shown in FIG. Hereinafter, the procedure for removing contaminants will be described with reference to FIG.

  In fields where pollutants are removed, if there are weeds or crop residues, they are trimmed, and the area to be removed is surrounded by corrugated sheets and water is supplied. As water for use, water such as rivers and ponds is used. The tractor 2 of the removal apparatus 1 is made to run in that, the soil is stirred by the substitution machine 3, and soil particles are made muddy. Fine particles in the soil particles are concentrated in the turbid water and collected as a slurry by the suction nozzle 4. Cooling water is supplied from the fresh water tank 101 to the suction device 14 of the suction nozzle 4. The turbid water sucked and collected by the suction nozzle 4 is classified into coarse particles and fine particles, and dehydrated as described below.

  The turbid water sucked by the suction nozzle 4 is sent to the raw water tank 102 and then classified by the cyclone 103. Fine particles having a predetermined size or less, for example, 75 μm or less, in the turbid water classified by the cyclone 103 overflow from the spiral classifier 104 toward the storage tank 105 together with water, and settled coarse particles exceeding 75 μm are discharged. . In addition, the aspirated turbid water may be mixed with soil particles and mixed with plant roots, weeds, and the like cut by the scraper 3, and these are discharged together with coarse particles to prevent blockage of the apparatus and the like.

  The discharged coarse particles and plants larger than 75 μm can be backfilled in the field if there is no problem by analyzing the amount of the pollutant and performing, for example, radioactivity measurement.

  The turbid water containing only fine particles stored in the storage tank 105 is stirred in the reaction tank 106, sent to the turbid water treatment tank 107, added with a polymer flocculant, adjusted for pH, etc., and then subjected to turbid water treatment. To the machine 108. Two-layer separation is performed in the muddy water treatment machine 108, and the supernatant water is recycled and sent to the fresh water tank 101. Sludge containing fine particles, for example, fine particles of 75 μm or less in this embodiment in a high concentration, is sent to a dehydrating device 109 such as a filter press, where the fine particles are made into a dehydrated cake. The dehydrated water may be sent to the fresh water tank 101.

  The fine particles thus dehydrated cake contain most of the radioactive substances contained in the original field soil. In the present invention, only the fine particles in the soil particles can be efficiently recovered, so that a great decontamination effect can be obtained with a small amount of waste.

  The existing soil washing system can be used for the muddy water treatment system that performs classification and dehydration as described above. Then, each device can be loaded on a trailer of about 10 t, for example, and transported to the site to perform muddy water treatment.

  According to the present invention, turbid water is simultaneously recovered while being scraped by the scraper 3 mounted on the tractor 2, so that the fine particles can be efficiently recovered before the fine particles of the soil are precipitated. Moreover, classification and dehydration of the collected fine particles are saved, and it can be carried out by 4 to 5 persons including the driver of the tractor 2, the auxiliary worker, and the operator of the muddy water treatment system.

  Further, the present invention is not limited to the removal of radioactive substances, but can also remove heavy metals such as lead, zinc, cadmium, and mercury.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  The field A (3 m × 15 m) where the contaminant removal process according to the present invention is performed and the field B (3 m × 10 m) where the process is performed according to the conventional method are surrounded by corrugated plates. The tractor was run at a minimum speed of 2.6 m / min, and scavenging was performed 9 times in Field A and 3 times in Field B, and the decontamination effect was evaluated from the changes in the concentration of radioactive cesium in paddy soil and muddy water. In addition, the conventional method in the field B is a method in which turbid water is manually pumped toward the position of the pump by hand after collecting with a tractor equipped with a scraper, and the turbid water is recovered by the pump.

  The concentration of radioactive cesium before decontamination of the field B of the conventional example is 2,760 Bq / kg, and the concentration of radioactive cesium is reduced to 1,844 Bq / kg (decontamination rate 33%) by the first depigmentation, and the second time. 1,395 Bq / kg (49%) at the third time, and 936 Bq / kg (66%) at the third time. In the conventional example, the radioactive cesium concentration of the mud separated from the collected muddy water is 6,080 Bq / kg (2.2 times concentrated) for the first mud, and 4,960 Bq / kg (1. (8 times concentration) The third mud was 5,490 Bq / kg (2.0 times concentration). It became clear that decontamination was carried out at almost the same concentration rate even after repeated collection of turbid water.

  The radioactive cesium concentration before decontamination of the field A of the present invention example is 2,795 Bq / kg, and by collecting turbid water nine times, the radioactive cesium concentration of the paddy soil is 609 Bq / kg (contamination rate 78%), about Reduced to 1/5.

In the field A, 1.5 m ³ of mud was removed from the muddy water sucked by the 9 times of oysters as a dehydrated cake. The radioactive cesium concentration of the dewatered cake (mud) at the time when 0.5 m ³ of mud was removed was 6,880 Bq / kg (2.5 times concentrated), and the mud concentration at the time of removal of 1.0 m ³ of mud was 3 , 760Bq / kg (1.3-fold concentration), the concentration of the mud at the time of removing the mud 1.5 m ³ in 3,170Bq / kg (1.1-fold concentration), increasing the amount of exhaust mud as dehydrated cake As a result, the radioactive cesium concentration decreased. The concentration of radioactive cesium collected in the turbid water was the highest in the concentration of turbid water collected by the second substitution, and was 1,000 Bq / L or more, but the concentration of turbid water collected in the third to sixth times was 700 to 800 Bq / L. The turbid water concentration collected at the seventh to ninth times was 400 to 500 Bq / L, and the radioactive cesium concentration decreased as the number of substitutions increased.

  From the above results, the conventional method cannot efficiently recover fine particles containing a large amount of radioactive material, and multiple debris and turbid water recovery operations are required for sufficient decontamination. However, since the muddy water is pushed out manually, a great deal of labor is required. On the other hand, if the processing apparatus of the present invention is used, it can be efficiently decontaminated with a small amount of labor, and a large decontamination effect can be obtained by using the initial (1st to 2nd). It was.

  The present invention can be applied when removing contaminants such as radioactive substances and heavy metals contained in soil.

DESCRIPTION OF SYMBOLS 1 Removal device 2 Tractor 3 Scraper 4 Suction nozzle 11 Tubular body 12 Nozzle part 13 Hose 14 Suction device 15 Clamp

To solve the above problems, the present invention, the water is supplied to the land, to the tractor, equipped with puddling machine, and a suction nozzle in the traveling direction behind the tractor than the puddling machine, the leading end portion of the suction nozzle Is placed below the surface of the water and above the bottom surface of the shaving, the tractor is run, and the turbid water containing soil particles is sucked up by the suction nozzle while the soil of the farmland is stirred by the shaving machine. The present invention provides a method for removing pollutants contained in agricultural soil.

Further, according to the present invention, there is provided a pollutant removing device used in the method for removing a pollutant contained in the farmland soil , wherein the tractor includes a grabber and a rearward direction of the tractor relative to the grabber An apparatus for removing pollutants contained in farmland soil is provided, which is equipped with a suction nozzle. The suction nozzle includes a nozzle portion attached to the tractor, a suction device, and a hose connecting them, and the nozzle portion and the hose are clamps that are rotatable according to the movement of the tractor. It is preferable that they are connected.

In order to solve the above-mentioned problem, the present invention supplies water to farmland, and a tractor is equipped with a scraper and a suction nozzle behind the scraper in the direction of travel of the tractor, and the tip of the suction nozzle Is placed below the surface of the water and above the bottom surface of the shaving, the tractor is run, and the soil of the farmland is stirred by the shaving machine, and the turbid water containing soil particles is sucked up by the suction nozzle. The tip of the suction nozzle has a diameter that widens from the tube portion toward the tip, and a suction port having a diameter larger than that of the tube portion is connected to the tip. Provide a method for removing contaminants.

  The present invention also provides water to the farmland, the tractor is equipped with a scraper and a suction nozzle behind the scraper in the direction of travel of the tractor, and the tip of the suction nozzle is attached to the surface of the water. The tractor is disposed below and above the shaving bottom, and the turbid water containing soil particles is sucked up with the suction nozzle while stirring the soil of the farmland with the shaving machine, Provided is a method for removing contaminants contained in farmland soil, characterized in that the bottom of the suction port is closed and an opening is provided on the side surface.
  The present invention also provides water to the farmland, the tractor is equipped with a scraper and a suction nozzle behind the scraper in the direction of travel of the tractor, and the tip of the suction nozzle is attached to the surface of the water. The tractor is disposed below and above the shaving bottom, and the turbid water containing soil particles is sucked up with the suction nozzle while stirring the soil of the farmland with the shaving machine, The suction port provides a method for removing contaminants contained in farmland soil, wherein the suction port has a shape that is curved by 90 ° so that the opening at the tip is oriented in the horizontal direction.
  The present invention also provides water to the farmland, the tractor is equipped with a scraper and a suction nozzle behind the scraper in the direction of travel of the tractor, and the tip of the suction nozzle is attached to the surface of the water. The tractor is disposed below and above the shaving bottom, and the turbid water containing soil particles is sucked up with the suction nozzle while stirring the soil of the farmland with the shaving machine, The suction port has a shape that is curved by 180 ° so that the opening at the front end faces upward, and provides a method for removing contaminants contained in farmland soil.

Further, according to the present invention, there is provided a pollutant removing device used in the method for removing a pollutant contained in the farmland soil, wherein the tractor includes a grabber and a rearward direction of the tractor relative to the grabber And a suction nozzle having a diameter wider from the tube portion toward the tip, and a suction port having a diameter larger than that of the tube portion is connected to the tip. An apparatus for removing contaminants contained in agricultural soil is provided.
Further, according to the present invention, there is provided a pollutant removing device used in the method for removing a pollutant contained in the farmland soil, wherein the tractor includes a grabber and a rearward direction of the tractor relative to the grabber There is provided a device for removing contaminants contained in farmland soil, wherein a suction nozzle is mounted on the bottom surface of the suction nozzle, the bottom of the suction nozzle is closed, and an opening is provided on the side surface.
Further, according to the present invention, there is provided a pollutant removing device used in the method for removing a pollutant contained in the farmland soil, wherein the tractor includes a grabber and a rearward direction of the tractor relative to the grabber A device for removing contaminants contained in farmland soil is characterized in that a suction nozzle is mounted on the suction nozzle, and the suction port of the suction nozzle has a shape that is curved by 90 ° so that the opening at the tip is oriented in the horizontal direction. Provided.
Further, according to the present invention, there is provided a pollutant removing device used in the method for removing a pollutant contained in the farmland soil, wherein the tractor includes a grabber and a rearward direction of the tractor relative to the grabber A device for removing contaminants contained in farmland soil is provided, wherein a suction nozzle is mounted on the suction nozzle, and the suction port of the suction nozzle has a shape curved by 180 ° so that the opening of the tip is upward. Is done.
The suction nozzle includes a nozzle portion attached to the tractor, a suction device, and a hose connecting them, and the nozzle portion and the hose are clamps that are rotatable according to the movement of the tractor. It is preferable that they are connected.

Moreover, FIG. 9 and FIG. 10 show still another example of the shape of the suction port. The suction port 23b shown in FIG. 9 has a shape curved by 90 ° so that the opening 34 at the front end faces in the horizontal direction , and the suction port 23c shown in FIG. 10 has a shape curved by 180 ° so that the opening 35 faces upward. It is. In either case, the coarse particles 41 that sink to the bottom of the ground are difficult to be sucked, and the fine particles 42 that are floating in water are sucked.

Claims (8)

Supply water to the farmland,
The tractor is equipped with a scraper, and a suction nozzle is disposed behind the proxy tractor in the direction of travel of the tractor,
Muddy water containing soil particles while the tip of the suction nozzle is disposed below the surface of the water and above the bottom surface of the water, the tractor is run, and the soil of the farmland is stirred by the surface device. A method for removing contaminants contained in agricultural soil, characterized in that the suction nozzle sucks up the soil.   2. The method for removing contaminants contained in farmland soil according to claim 1, wherein the tip of the suction nozzle has a diameter that increases from the tube toward the tip.   The method for removing contaminants contained in farmland soil according to claim 1 or 2, wherein the turbid water is sucked up from a side of a tip portion of the suction nozzle.   The contamination contained in farmland soil according to claim 1 or 2, characterized in that the tip of the suction nozzle is curved and the muddy water is sucked into the suction nozzle from the side or top of the tip of the suction nozzle. How to remove material.   Of the soil particles contained in the turbid water sucked up by the suction nozzle, coarse particles exceeding a predetermined size are classified by a cyclone, and a flocculant is added to the water excluding the coarse particles to precipitate the remaining soil particles. The method for removing contaminants contained in farmland soil according to any one of claims 1 to 4, wherein the soil particles and water are separated.   The said contaminant is a heavy metal or a radioactive substance, The removal method of the contaminant contained in the farmland soil in any one of Claims 1-5 characterized by the above-mentioned. A pollutant removing device used in the method for removing a pollutant contained in farmland soil according to any one of claims 1 to 6,
An apparatus for removing contaminants contained in farmland soil, wherein a tractor is mounted on a tractor, and a suction nozzle is arranged behind the substitute tractor in the traveling direction of the tractor. The suction nozzle has a nozzle portion attached to the tractor, a suction device, and a hose connecting them,
The apparatus for removing contaminants contained in farmland soil according to claim 7, wherein the nozzle portion and the hose are connected by a clamp that is rotatable in accordance with the movement of the tractor.

Images