JP2016020860A - Decontamination system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decontamination system capable of increasing decontamination efficiency without a temporary inspection yard for decontamination confirmation.SOLUTION: There is provided a decontamination system which comprises: a first classifier 10 for comparing a radiation level of contaminated soils and a processing limit value to classify the contaminated soils into processable soils whose radiation level is below the processing limit value and soils containing a high level of radiation exceeding the processing limit value; a purifier 20 for purifying the processable soils to reduce their radiation level and discharging the soils as the processed soils; and a second classifier 30 for comparing a radiation level of the processed soils discharged from the purifier 20 and a purification reference value to classify the processed soils into purified soils whose radiation level is below the purification reference value and soils to be reprocessed containing a high level of radiation exceeding the purification reference value. The soils classified as processable by the first classifier 10 and the soils as something to be reprocessed by the second classifier 30 are placed in the purifier 20 as the soils to be processed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a contaminant purification system for cleaning soil and rubble (woods, metals, rubbers, plastics, etc.) contaminated by radioactive substances.

  Various cleaning treatment apparatuses have been proposed for cleaning and purifying (removing radioactive substances) soil and rubble (hereinafter referred to as pollutants) contaminated with radioactive substances (see, for example, Patent Document 1). When cleaning and purifying contaminants with such a cleaning treatment device, measure the radioactive concentration of the treated substance after washing and confirm that the radioactive concentration is reduced below the reference value and meets the purification standard. It is necessary to confirm the purification to be confirmed. Conventionally, the radioactivity concentration is measured by measuring the air dose of a treated substance that has been temporarily placed in a certain amount, calculated from the measured air dose by simple calculation, or by taking a sample from the treated material that has been placed temporarily in a certain amount, It was measured in the laboratory. When the treated substance does not satisfy the purification standard, reprocessing is performed by the cleaning processing apparatus.

JP 2013-178137 A

  However, the conventional technology requires a temporary storage inspection yard for temporarily storing the processed material after cleaning, and the purification confirmation cannot be measured in real time, so that a large amount of processed products that exceed the purification standard have been processed. There is a risk that the material will be stocked in the temporary inspection yard. In particular, when soil or rubble (hereinafter referred to as high-concentration contaminants) contaminated with radioactive material at a high concentration is mixed with the contaminants, the cleaning treatment device cannot completely purify the high-concentration contaminants and the high concentration Treated substances containing contaminants are stocked in the temporary inspection yard. In the temporary storage inspection yard, it is difficult to select and dispose of only high-concentration contaminants, so that the treated substances stocked in the temporary storage inspection yard are repeatedly cleaned to satisfy the purification standards. The purification efficiency is reduced.

  The present invention has been made in view of such a situation, and is capable of solving the above-described problems and improving the purification efficiency without requiring a temporary inspection yard for confirmation of purification. It is to provide a purification system.

The pollutant purification system of the present invention is a pollutant purification system for reducing the radioactive concentration of contaminants contaminated by radioactive substances to a purification standard value or less, wherein the radioactive concentration of the contaminants and the processing limit value are determined. By comparing, a first separation device that separates a processable substance having a radioactive concentration below the treatment limit value and a high-concentration contaminant whose radioactive concentration exceeds the treatment limit value; By comparing the cleaning treatment device that discharges the processed material whose radioactive concentration has been reduced by cleaning with the radioactive concentration of the processed material discharged from the cleaning processing device and the purification standard value, A second separation device that separates a purified substance having an active concentration equal to or less than the purification standard value and a reprocessed material having a radioactivity concentration exceeding the purification standard value, and is separated by the first separation device Processable substances , Characterized in that said reprocessed material fractionated by the second fractionation apparatus is turned to the cleaning apparatus, as the process material.
Furthermore, in the contaminant purification system according to the present invention, the first separation device includes a first measuring unit that measures either or both of the weight and the volume of the contaminant conveyed on the first belt conveyor, First radiation dose measuring means for measuring the radiation dose of the contaminant weighed by the first weighing means, and based on the measurement result by the first weighing means and the measurement result by the first radiation dose measurement means. Calculating the radioactive concentration of the contaminants,
The second sorting device includes a second metering unit for weighing one or both of the weight and the volume of the processed material conveyed on the second belt conveyor, and the processing measured by the second metering unit. Second radiation dose measuring means for measuring the radiation dose of the finished substance, and based on the measurement result by the second weighing means and the measurement result by the second radiation dose measurement means, the radioactivity of the treated substance The concentration may be calculated.
Furthermore, in the contaminant purification system according to the present invention, the cleaning processing apparatus includes a cleaning processing means for cleaning the processing material, a hopper that receives the processable material and the reprocessing material that are input as the processing material, and a hopper There may also be provided a quantitative supply means for cutting out the predetermined amount of the processing substance and feeding it into the cleaning means.
Furthermore, in the contaminant purification system of the present invention, the first fractionation device compares the radioactive concentration of the contaminant with a treatment limit proximity threshold value lower than the treatment limit value,
When the radioactive concentration of the contaminant is not more than the processing limit value and exceeds the processing limit proximity threshold value, the cleaning capability in the cleaning processing apparatus may be increased.
Furthermore, in the contaminant purification system of the present invention, the second fractionation device compares the radioactive concentration of the treated substance with a purification reference proximity threshold value lower than the purification reference value, and the radioactive concentration of the treated substance Is less than or equal to the purification reference value and exceeds the purification reference proximity threshold, the cleaning ability of the cleaning processing apparatus may be increased.
Furthermore, in the contaminant purification system of the present invention, the cleaning ability of the cleaning processing apparatus may be increased by reducing the amount of the processing substance cut out by the quantitative supply means.
Furthermore, in the pollutant purification system of the present invention, the cleaning apparatus includes a substance amount detection unit that detects a substance amount in the hopper, and the substance amount in the hopper has exceeded a preset limit amount. In this case, the processable substance may be stopped from being fed from the first separation device to the hopper of the cleaning processing device.
Furthermore, in the contaminant purification system of the present invention, comprising a notification means for notifying an error,
After stopping the introduction of the processable substance from the first fractionation device to the hopper of the cleaning processing apparatus, the state in which the amount of the substance in the hopper exceeds the limit amount continues for a predetermined time. In this case, an error may be notified from the notification means.

  According to the present invention, since a processable substance obtained by separating high-concentration contaminants from contaminants before the cleaning process is input to the cleaning processing apparatus, the cleaning process for high-concentration contaminants is not repeated, and the purification efficiency is improved. In addition to being able to improve, the reprocessed material that separated the purified material from the treated material after the cleaning process is thrown into the cleaning device, so there is no need for a temporary inspection yard for confirmation of purification. There is an effect.

It is a schematic block diagram which shows the structure of embodiment of the contaminant purification system which concerns on this invention. It is a block diagram which shows the structure of the contaminant purification system shown in FIG. It is a perspective view which shows the structural example of the classification | category part shown in FIG.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

  The pollutant purification system according to the present embodiment is a system for cleaning contaminants such as soil and debris contaminated with radioactive substances to lower the radioactivity concentration below the purification standard value. The first sorting device 10, the cleaning processing device 20, and the second sorting device 30 are provided. The first sorting device 10, the cleaning processing device 20, and the second sorting device 30 are configured to be controlled by a system control device 40 as shown in FIG. Hereinafter, an example in which soil contaminated with radioactive substances (hereinafter referred to as contaminated soil) is washed as a contaminant will be described.

  The first separation device 10 is a device for separating soil contaminated with radioactive material from contaminated soil at a high concentration (hereinafter referred to as highly-contaminated soil), and includes a hopper 11, a quantitative supply unit 12, and a belt. A conveyor 13, a weighing unit 14, a radiation dose measuring unit 15, and a sorting unit 16 are provided.

  The fixed amount supply unit 12 is a device that is arranged at the bottom of the hopper 11 and cuts out the contaminated soil put into the hopper 11 on the belt conveyor 13 by a predetermined amount. The amount of contaminated soil cut out by the quantitative supply unit 12 is configured to be controllable by the system control device 40.

  The weighing unit 14 is a device that continuously measures the weight of the contaminated soil conveyed on the belt conveyor 13 in real time. For example, the weighing unit 14 abuts on the transport belt of the belt conveyor 13 from the lower surface side, and detects the load of the contaminated soil located at a unit length on the transport belt, and electrically detects the load detected by the load roller. And a load cell for converting the signal.

  The radiation dose measuring unit 15 is a device that is disposed on the conveyor belt of the belt conveyor 13 so as to face the weighing unit 14 and measures the radiation dose of the contaminated soil measured by the weighing unit 14.

  The classification unit 16 calculates the radioactive concentration (Bq / kg) of the contaminated soil based on the measurement result by the measurement unit 14 and the measurement result by the radiation dose measurement unit 15. Then, the sorting unit 16 sorts the high-concentration contaminated soil by comparing the calculated radioactivity concentration with the processing limit value. The treatment limit value is a radioactive concentration that can be washed by the washing treatment apparatus 20, and in the washing treatment apparatus 20, the contaminated soil having the treatment concentration limit value is purified by one washing treatment. It is assumed that the value will be lowered below the value. For example, as shown in FIG. 3, the separation unit 16 is configured by a separation belt conveyor 50 provided at the discharge end of the belt conveyor 13, and when the calculated radioactivity concentration is equal to or lower than the processing limit value, the separation unit 16 is separated. The conveyor belt 50 is rotated forward in the direction indicated by the arrow X, and the contaminated soil having a radioactivity concentration equal to or lower than the treatment limit value is separated as a treatable soil that can be washed by the washing treatment apparatus 20. To do. Then, when the calculated radioactivity concentration exceeds the processing limit value, the sorting unit 16 reverses the sorting belt conveyor 50 in the direction indicated by the arrow Y and transports the washing belt by the washing processing device 20. Separate highly contaminated soil that is not suitable for In addition, the sorting unit 16 compares the calculated radioactivity concentration with a processing limit proximity threshold value lower than the processing limit value, and when the calculated radioactivity concentration exceeds the processing limit proximity threshold value, the radiation of the treatable soil is determined. A concentration warning signal notifying that the active concentration is close to the processing limit value is output to the system controller 40.

  Referring to FIG. 1, the cleaning processing device 20 includes a hopper 21, a weighing unit 22, a constant supply unit 23, and a cleaning processing unit 24.

  The hopper 21 is charged with soil to be cleaned by the cleaning processing unit 24 (hereinafter referred to as “processed soil”), and the quantitative supply unit 23 arranged at the bottom of the hopper 21 is used to treat the processed soil input into the hopper 21. A predetermined amount is cut into the cleaning processing unit 24. The cut-out amount of the treated soil by the quantitative supply unit 23 is configured to be controllable by the system control device 40.

  The measuring unit 22 is a device that measures the weight of the treated soil put into the hopper 21, and is configured by a load cell or the like. And the measurement result by the measurement part 22 is output to the system control apparatus 40 as a soil quantity signal which notifies the soil quantity in the hopper 21. FIG.

  The washing processing unit 24 is a device that discharges the treated soil from which radioactive substances have been removed by washing the treated soil. In the cleaning processing unit 24, for example, a muddy water treatment process in which the cleaning water is loosened to a muddy water state, a grinding process for stripping off radioactive substances attached to the surface, and a classification for separating coarse soil, fine soil, and cleaning water.・ Rinsing and dehydration are performed. Further, in the cleaning processing unit 24, the radioactive substance is adsorbed by the adsorbent from the solid-liquid-separated processing liquid after baking with a reaction accelerator to separate the radioactive substance by baking or treatment with a chemical such as an oxalic acid solution. You may make it perform a chemical | medical agent adsorption | suction process.

  The second sorting device 30 is a device for separating reprocessed soil that needs to be washed again by the washing processing unit 24 from the treated soil discharged from the washing processing unit 24, and includes a hopper 31 and a quantitative supply. A section 32, a belt conveyor 33, a weighing section 34, a radiation dose measuring section 35, and a sorting section 36 are provided. The second sorting device 30 may have the same configuration as the first sorting device 10.

  Treated soil cleaned by the cleaning processing unit 24 is input to the hopper 31, and the quantitative supply unit 32 disposed at the bottom of the hopper 31 transfers the processed soil input to the hopper 31 onto the belt conveyor 33. Cut out a predetermined amount. The amount of contaminated soil cut out by the quantitative supply unit 32 is configured to be controllable by the system control device 40.

  The weighing unit 34 is a device that continuously calibrates the weight of the treated soil conveyed on the belt conveyor 33 in real time. For example, the weighing unit 34 is in contact with the transport belt of the belt conveyor 33 from the lower surface side, and detects the load of the contaminated soil located at a unit length on the transport belt, and electrically detects the load detected by the load roller. And a load cell for converting the signal.

  The radiation dose measuring unit 35 is a device that is disposed on the conveyance belt of the belt conveyor 33 so as to face the weighing unit 34 and measures the radiation dose of the contaminated soil measured by the weighing unit 34.

  The classification unit 36 calculates the radioactivity concentration (Bq / kg) of the treated soil based on the measurement result by the measurement unit 34 and the measurement result by the radiation dose measurement unit 35. Then, the sorting unit 36 sorts the reprocessed soil by comparing the calculated radioactivity concentration with the purification reference value. When the calculated radioactivity concentration is less than or equal to the purification standard value, the classification unit 36 classifies the soil as washed soil, and when the calculated radioactivity concentration exceeds the purification standard value, the cleaning processing device 20 performs again. Sort the reprocessed soil that needs to be washed. Further, the sorting unit 36 compares the calculated radioactivity concentration with a purification standard proximity threshold value lower than the purification standard value, and when the calculated radioactivity concentration exceeds the purification standard proximity threshold value, A concentration warning signal for notifying that the effective concentration is close to the purification reference value is output to the system controller 40.

  The system control device 40 is an information processing device such as a personal computer that operates under program control. The system control device 40 is configured to be able to control the cutout amount in the quantitative supply unit 12 of the first separation device 10, the quantitative supply unit 23 of the cleaning processing device 20, and the quantitative supply unit 32 of the second separation device 30. Yes. And the system control apparatus 40 controls the amount of cut-out of each fixed_quantity | quantitative_assay supply part 12,23,32 to the substantially same quantity at the normal time, and if the concentration warning signal is input, the fixed_quantity | feed_rate supply part 23 of the washing | cleaning processing apparatus 20 will have. The cutout amount is controlled to be smaller than normal. In addition, when the system control device 40 detects that the soil amount in the hopper 21 exceeds a preset limit amount by the soil amount signal input from the measuring unit 22 of the cleaning processing device 20, the first sorting device 10 The cut-out by the quantitative supply unit 12 is stopped. And after stopping cutting by the fixed_quantity | feed_rate supply part 12 of the 1st separation apparatus 10, if the amount of soil in the hopper 21 falls below the preset limit amount before the preset predetermined time elapses, the first Cutting is resumed by the quantitative supply unit 12 of the sorting apparatus 10. On the other hand, after stopping the cutting by the quantitative supply unit 12 of the first sorting apparatus 10, the state in which the amount of soil in the hopper 21 exceeds the preset limit amount is maintained even after a preset time has elapsed. In the case where it has been performed, the system control device 40 also stops cutting out the quantitative supply unit 23 of the cleaning processing device 20 and the quantitative supply unit 32 of the second sorting device 30, and displays a warning light or the like, a buzzer, or the like An error is notified by the notification unit 41 including the voice output means.

Next, operation | movement of the purification processing system of this Embodiment is demonstrated in detail based on FIG.
First, as shown by the arrow A, the contaminated soil is put into the hopper 11 of the first sorting device 10. The contaminated soil thrown into the hopper 11 is cut out by a predetermined amount on the belt conveyor 13 as indicated by an arrow B by the constant supply unit 12 arranged at the bottom of the hopper 11.

  The contaminated soil cut out on the belt conveyor 13 is conveyed toward the sorting unit 16 by the belt conveyor 13 as indicated by an arrow C. The contaminated soil is weighed by the measuring unit 14 and the radiation dose is measured by the radiation dose measuring unit 15 until reaching the sorting unit 16. And the classification | fractionation part 16 calculates the radioactive concentration (Bq / kg) of contaminated soil based on the measurement result by the measurement part 14, and the measurement result by the radiation dose measurement part 15, The contamination which has been conveyed Separate highly contaminated soil from soil.

  Contaminated soil in which the calculated radioactivity concentration exceeds the treatment limit value (for example, 8000 Bq / kg) is highly contaminated soil that is not suitable for the washing treatment by the washing treatment apparatus 20 as indicated by the arrow D by the sorting unit 16. Are classified as This highly-contaminated soil will be stored in a state of disposal by a special method that does not leak radioactivity to the managed disposal site based on the Special Measures against Radioactive Substance Contamination. As a result, it is possible to prevent the contaminated soil deviating from the cleaning capability from being introduced into the subsequent cleaning processing apparatus 20 and to reduce the frequency of repeated cleaning processing, thereby improving the purification efficiency. it can.

  On the other hand, the contaminated soil whose calculated radioactivity concentration is equal to or lower than the processing limit value is classified as a treatable soil suitable for the cleaning processing by the cleaning processing device 20 by the sorting unit 16 as indicated by the arrow E, and the cleaning processing device 20 To the hopper 21 as treated soil. In addition, the processable soil may be configured to be input directly from the sorting unit 16 to the hopper 21 of the cleaning processing apparatus 20, and the processable soil discharged from the sorting unit 16 is washed by a conveying means such as a belt conveyor. You may comprise so that it may convey to the processing apparatus 20 and throw in into the hopper 21. FIG.

  The treated soil thrown into the hopper 21 is cut into the washing treatment unit 24 by a predetermined amount as indicated by an arrow F by the fixed amount supply unit 23 arranged at the bottom of the hopper 21. And the washing process part 24 discharges | emits the processed soil which removed the radioactive substance by wash-processing the treated soil.

  The treated soil discharged from the cleaning processing unit 24 is put into the hopper 31 of the second sorting device 30 as indicated by an arrow G. The treated soil may be directly fed into the hopper 31 of the second sorting device 30 from the cleaning processing device 20, and the treated soil discharged from the cleaning processing device 20 is transported by a belt conveyor or the like. May be configured to be conveyed to the second sorting device 30 and put into the hopper 31.

  The treated soil thrown into the hopper 31 is cut out by a predetermined amount on the belt conveyor 33 as indicated by an arrow H by a fixed amount supply unit 32 arranged at the bottom of the hopper 31.

  The treated soil cut out on the belt conveyor 33 is conveyed toward the sorting unit 36 by the belt conveyor 33 as indicated by an arrow I. The weight of the treated soil is measured by the measuring unit 34 and the radiation dose is measured by the radiation dose measuring unit 35 before reaching the sorting unit 36. And the classification | fractionation part 36 has been conveyed by calculating the radioactive density | concentration (Bq / kg) of processed soil based on the measurement result by the measurement part 34, and the measurement result by the radiation dose measurement part 35. The reprocessed soil that needs to be washed again by the washing treatment apparatus 20 is separated from the treated soil.

  The treated soil whose calculated radioactivity concentration is equal to or less than the purification standard value (for example, 3000 Bq / kg), which is the purification standard, has been cleaned by the cleaning unit 20 by the sorting unit 16 as indicated by the arrow K. Sorted and discharged as purified soil.

  On the other hand, the treated soil whose calculated radioactivity concentration exceeds the purification standard value is separated as retreated soil by the sorting unit 36 as indicated by an arrow J, and is input to the hopper 21 of the cleaning treatment apparatus 20 as treated soil. Is done. In addition, you may comprise so that reprocessing soil may be directly injected | thrown-in to the hopper 21 of the washing | cleaning processing apparatus 20 from the separation part 36, and wash | cleans the reprocessing soil discharged | emitted from the separation part 36 by conveyance means, such as a belt conveyor. You may comprise so that it may convey to the processing apparatus 20 and throw in into the hopper 21. FIG.

  In the cleaning processing unit 24, the radioactive substance removed by the cleaning process is discharged as a residue (fine particles). This residue tends to concentrate the radioactive material, and the radioactivity concentration may exceed the processing limit value. Therefore, it is preferable that the residue discharged from the cleaning processing unit 24 is also sorted according to whether or not the radioactivity concentration exceeds the processing limit value (for example, 8000 Bq / kg). As a result, based on the Special Measures Act against Radioactive Substance Contamination, residues that exceed the processing limit value are disposed of in a special manner at a management-type disposal site, etc. It can be stored separately in each street disposal state. For the separation of the residue discharged from the cleaning processing unit 24, a new third sorting device having the same configuration as the first sorting device 10 and the second sorting device 30 may be used, and the residue discharged from the cleaning processing unit 24 is used. You may use the 2nd sorting apparatus 30 which sorts the processed soil. When the second sorting device 30 is used, when the residue discharged from the cleaning processing unit 24 has accumulated to some extent, the cut-out of the treated soil by the quantitative supply unit 32 is stopped and the residue is sorted. Good.

  In the present embodiment, it is assumed that the contaminated soil whose radioactivity concentration is the treatment limit value is reduced to the purification standard value or less by one washing process by the washing treatment apparatus 20, but the purification standard for some reason. When it cannot be reduced below the value, it is sorted as reprocessed soil by the second sorting device 30 and is put into the hopper 21 of the cleaning processing device 20 as treated soil. Since the treatable soil separated by the first separation device 10 is also input as treated soil into the hopper 21 of the washing treatment device 20, if the amount of reprocessed soil separated by the second separation device 30 is increased, washing is performed. The amount of treated soil in the hopper 21 of the processing apparatus 20 increases. Therefore, when the system control device 40 detects that the soil amount in the hopper 21 exceeds a preset limit amount by the soil amount signal input from the measuring unit 22 of the cleaning processing device 20, the first sorting device 10 The cut-out by the quantitative supply unit 12 is stopped. Thereby, since the input to the hopper 21 of the washing | cleaning processing apparatus 20 of the processable soil separated by the 1st separation apparatus 10 is stopped, it prevents that treated soil overflows from the hopper 21 of the washing | cleaning processing apparatus 20. be able to. It should be noted that the contaminated soil on the belt conveyor 13 and the treatable soil in the sorting unit 16 are thrown into the hopper 21 of the cleaning processing device 20 simply by stopping the cutout by the quantitative supply unit 12 of the first sorting device 10. Therefore, the limit amount may be set in consideration of this amount. In addition, the belt conveyor 13 and the sorting unit 16 may be stopped simultaneously with the stop of the cutout by the constant supply unit 12.

  In addition, when some trouble occurs in the cleaning processing apparatus 20 and the cleaning capability is lost, the cleaning processing apparatus 20 is discharged even if the quantitative supply unit 12 of the first sorting apparatus 10 is stopped. The entire amount of the treated soil is input to the hopper 21 of the cleaning processing apparatus 20 as reprocessed soil, and the amount of soil in the hopper 21 does not decrease. Therefore, the system control device 40 stops the cutting by the quantitative supply unit 12 of the first sorting device 10, and then the amount of soil in the hopper 21 is set to a predetermined limit amount even after a predetermined time has elapsed. When the state exceeding the above is maintained, the cut-out of the quantitative supply unit 23 of the cleaning processing device 20 and the quantitative supply unit 32 of the second sorting device 30 is also stopped, and the notification unit 41 notifies the error. Thereby, it is possible to notify that a failure has occurred in the cleaning capability of the cleaning processing apparatus 20.

  The cleaning capability of the cleaning processing apparatus 20 increases as the amount of treated soil put into the cleaning processing unit 24 decreases. Therefore, the sorting unit 16 of the first sorting apparatus 10 compares the calculated radioactivity concentration with a processing limit proximity threshold (for example, 6000 Bq / kg) lower than the processing limit value, and the calculated radioactivity concentration is processed. When the limit proximity threshold is exceeded, a concentration warning signal for notifying that the radioactive concentration is close to the processing limit value is output to the system control device 40. When the concentration warning signal is input, the system control device 40 controls the cut-out amount of the quantitative supply unit 23 of the cleaning processing device 20 to be smaller than that in the normal time. Thereby, when the radioactivity density | concentration of a processable soil is near a process limit value, the radioactivity density | concentration of a treated soil is reduced reliably by raising the washing | cleaning capability of the washing | cleaning processing apparatus 20, and it sorts as reprocessed soil. Therefore, the purification efficiency can be improved. Further, the sorting unit 36 of the second sorting device 30 compares the calculated radioactivity concentration with a purification standard proximity threshold value (for example, 2000 Bq / kg) lower than the processing limit value, and the calculated radioactivity concentration is purified. When the reference proximity threshold is exceeded, a concentration warning signal for notifying that the radioactive concentration of the purified soil is close to the processing limit value is output to the system controller 40. When the concentration warning signal is input, the system control device 40 controls the cut-out amount of the quantitative supply unit 23 of the cleaning processing device 20 to be smaller than that in the normal time. Thereby, when the radioactivity concentration of the purified soil is close to the purification standard value, the radioactivity concentration of the treated soil is surely lowered by separating the radioactivity concentration of the treated soil by increasing the washing capability of the washing treatment apparatus 20. Therefore, the purification efficiency can be improved. Note that, by reducing the amount of treated soil introduced into the cleaning processing unit 24, the cleaning capability of the cleaning processing apparatus 20 can be increased without controlling the cleaning processing operation in the cleaning processing unit 24. On the other hand, when a concentration warning signal is input to the system control device 40, the system control device 40 notifies the cleaning processing unit 24 to that effect so that the cleaning processing unit 24 operates with an increased cleaning capability. good. For example, when performing a cleaning process using a chemical such as an oxalic acid solution, the cleaning ability can be improved by increasing the amount of the chemical used. Moreover, when performing a washing process by the grinding process, the washing ability can be enhanced by extending the grinding process time and increasing the amount to be removed.

  In the present embodiment, the radioactivity concentration of the contaminated soil and the treated soil is accurately calculated by measuring the weight of the contaminated soil and the treated soil, but the specific gravity of the contaminated soil is predicted in advance. If necessary, measure the volume of contaminated soil and treated soil, and accurately determine the radioactive concentration of contaminated soil and treated soil based on the measured volume of contaminated soil and treated soil and the radiation dose, respectively. It may be calculated. The volume of the contaminated soil and the treated soil is measured using, for example, a container whose capacity is set in advance before the conveyor belts 13 and 33 are loaded with the contaminated soil and the treated soil cut out from the quantitative supply units 12 and 32. can do. Further, the contaminated soil and the treated soil after loading on the belt conveyors 13 and 33 can be imaged with a camera or the like, and the volume can be measured based on the image data. Further, the cross-sectional area can be obtained by irradiating the contaminated soil and the treated soil after loading the belt conveyors 13 and 33 with laser light or the like, and the volume can be measured based on the cross-sectional area. Also, weigh both the volume and the volume of the contaminated soil and the treated soil, and based on the measured weight and volume of the contaminated soil and the treated soil and the radiation dose, the radioactive concentration of the contaminated soil and the treated soil May be calculated respectively. In this case, the radioactivity concentration can be calculated more accurately.

As described above, according to the present embodiment, it is a pollutant purification system for reducing the radioactive concentration of contaminated soil contaminated with radioactive substances to a purification standard value or less, and the radioactive concentration and treatment of contaminated soil By comparing the limit value, the first sorting device 10 for sorting into a treatable soil having a radioactivity concentration equal to or lower than the treatment limit value and a high-concentration contaminated soil in which the radioactivity concentration exceeds the treatment limit value was input. By comparing the cleaning treatment apparatus 20 that discharges the treated soil whose radioactive concentration has been reduced by washing the treated soil, and the purification standard value of the treated soil discharged from the washing treatment apparatus 20 And a second separation device 30 that separates purified soil whose radioactivity concentration is below the purification standard value and reprocessed soil whose radioactivity concentration exceeds the purification standard value, and is separated by the first separation device 10. Treatable soil A reprocessing soil fractionated by the second fractionation device 30 is configured to be placed in a cleaning apparatus 20 as treated soil.
With this configuration, the processable soil obtained by separating the high-concentration contaminated soil from the contaminated soil before the cleaning treatment is input to the cleaning processing device 20, so that the cleaning treatment of the high-concentration contaminated soil is not repeated and the purification efficiency is improved. In addition, since the reprocessed soil obtained by separating the purified soil from the treated soil after the cleaning treatment is input to the cleaning processing device 20, a temporary placement inspection yard for confirming the purification is not required.

Furthermore, in the present embodiment, the first sorting device 10 measures the weight of the contaminated soil conveyed on the belt conveyor 13 and measures the radiation dose of the contaminated soil measured by the weighing unit 14. A radiation dose measuring unit 15 that calculates the radioactivity concentration of the contaminated soil based on the measurement result by the weighing unit 14 and the measurement result by the radiation dose measurement unit 15, and the second sorting device 30 is a belt conveyor. 33. A weighing unit 34 that measures the weight of the treated soil conveyed on the top 33, and a radiation dose measuring unit 35 that measures the radiation dose of the treated soil measured by the weighing unit 34. Based on the result and the measurement result by the radiation dose measuring unit 35, the radioactivity concentration of the treated soil is calculated.
With this configuration, the radiation dose of the contaminated soil before the washing treatment can be accurately measured, and the radiation dose of the treated soil after the washing treatment can be accurately measured.

Furthermore, in this Embodiment, the washing | cleaning processing apparatus 20 is the washing | cleaning process part 24 which wash | cleans the treated soil, the hopper 21 which receives the input processable soil and reprocessed soil as treated soil, and the treated soil in the hopper 21 And a fixed quantity supply unit 23 that cuts out a predetermined amount and puts it into the cleaning processing unit 24.
With this configuration, it is possible to control the cleaning ability of the cleaning processing apparatus 20 by adjusting the amount of processing soil to be input to the cleaning processing unit 24.

Further, in the present embodiment, the first sorting device 10 compares the radioactive concentration of the contaminated soil with the processing limit proximity threshold that is lower than the processing limit value, and the radioactive concentration of the contaminated soil is equal to or lower than the processing limit value. When the processing limit proximity threshold is exceeded, the amount of cut out of the treated soil by the quantitative supply means is reduced.
With this configuration, when the radioactive concentration of the contaminated soil before the cleaning process is close to the processing limit value of the cleaning processing apparatus 20, the cleaning process is performed by increasing the cleaning capability of the cleaning processing apparatus 20. Thus, the amount separated as reprocessed soil can be reduced, and the purification efficiency can be improved.

Furthermore, in the present embodiment, the second sorting device 30 compares the radioactive concentration of the treated soil with the purification reference proximity threshold that is lower than the purification reference value, and the radioactive concentration of the treated soil is less than or equal to the purification reference value. When the purification reference proximity threshold is exceeded, the amount of cut out of the treated soil by the quantitative supply hand 24 is reduced.
With this configuration, when the radioactivity concentration of the treated soil after the washing process approaches the purification reference value, the washing ability of the washing apparatus 20 is increased and the washing process is performed. The amount to be separated can be reduced, and the purification efficiency can be improved.

Further, in the present embodiment, the cleaning processing apparatus 20 includes a measuring unit 22 that functions as a substance amount detection unit that detects the amount of soil in the hopper 21, and sets a limit amount in which the amount of soil in the hopper 21 is set in advance. When it exceeds, it is comprised so that injection | throwing-in of the processable soil from the 1st separation apparatus 10 to the hopper 21 of the washing | cleaning processing apparatus 20 may be stopped.
With this configuration, it is possible to prevent the treated soil from overflowing from the hopper 21 of the cleaning treatment apparatus 20.

Furthermore, in this Embodiment, the alerting | reporting part 41 which alert | reports an error is provided, and after throwing in the processable soil from the 1st separation apparatus 10 to the hopper 21 of the washing | cleaning processing apparatus 20 is stopped, the amount of soil in the hopper 21 When the state in which the amount exceeds the limit amount continues for a predetermined time set in advance, the notification unit 41 is configured to notify an error.
With this configuration, it is possible to notify that a failure has occurred in the cleaning capability of the cleaning processing apparatus 20.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of these components, and that such modifications are within the scope of the present invention.
For example, in the present embodiment, the entire amount separated as the treatable soil by the first separation device 10 is washed by the washing treatment device 20, but the treatable soil separated by the first separation device 10 is A third sorting device for sorting depending on whether or not the radioactivity concentration is equal to or less than the purification standard value may be provided, and only the processable soil having a radioactivity concentration exceeding the purification standard value may be washed by the washing treatment device 20.

DESCRIPTION OF SYMBOLS 10 1st separation apparatus 11 Hopper 12 Constant supply part 13 Belt conveyor 14 Weighing part 15 Radiation dose measurement part 16 Separation part 20 Cleaning processing device 21 Hopper 22 Weighing part 23 Fixed supply part 24 Cleaning processing part 30 2nd separation apparatus 31 Hopper 32 Constant supply unit 33 Belt conveyor 34 Weighing unit 35 Radiation dose measuring unit 36 Sorting unit 40 System control device 41 Notification unit 50 Belt conveyor for sorting

Claims (8)

A pollutant purification system that reduces the radioactive concentration of pollutants contaminated with radioactive substances below the purification standard value,
By comparing the radioactive concentration of the pollutant and the processing limit value, it can be separated into a treatable substance whose radioactive concentration is lower than the processing limit value and a high concentration pollutant whose radioactive concentration exceeds the processing limit value. A first sorting device to
A cleaning processing device for cleaning the input processing substances and discharging the processed substances whose radioactive concentration has been reduced;
By comparing the radioactive concentration of the treated substance discharged from the cleaning treatment apparatus with the purification standard value, the purified substance whose radioactive concentration is equal to or less than the purification standard value and the radioactive concentration are the purification standard value. A second sorting device for sorting into reprocessing substances exceeding
Pollutant purification, wherein the processable substance separated by the first separation apparatus and the reprocessed substance separated by the second separation apparatus are input to the cleaning treatment apparatus as the treatment substance system. The first sorting device includes a first measuring unit that measures one or both of the weight and the volume of the contaminant conveyed on the first belt conveyor, and the contaminant measured by the first measuring unit. First radiation dose measuring means for measuring the radiation dose of the pollutant, and calculating the radioactive concentration of the contaminant based on the measurement result by the first measurement means and the measurement result by the first radiation dose measurement means And
The second sorting device includes a second metering unit for weighing one or both of the weight and the volume of the processed material conveyed on the second belt conveyor, and the processing measured by the second metering unit. Second radiation dose measuring means for measuring the radiation dose of the finished substance, and based on the measurement result by the second weighing means and the measurement result by the second radiation dose measurement means, the radioactivity of the treated substance The contaminant purification system according to claim 1, wherein the concentration is calculated. The cleaning processing apparatus includes cleaning processing means for cleaning the processing substance,
A hopper for receiving the processable substance and the reprocessed substance that are input as the process substance;
The pollutant purification system according to claim 1 or 2, further comprising a quantitative supply unit that cuts out a predetermined amount of the processing substance in the hopper and puts it into the cleaning processing unit. The first fractionation device compares the radioactive concentration of the contaminant with a processing limit proximity threshold lower than the processing limit value;
4. The contaminant purification according to claim 3, wherein when the radioactive concentration of the contaminant is equal to or less than the treatment limit value and exceeds the treatment limit proximity threshold, the cleaning ability of the cleaning treatment apparatus is increased. system. The second fractionation device compares the radioactive concentration of the treated substance with a purification standard proximity threshold lower than the purification standard value;
5. The cleaning capability of the cleaning processing apparatus is increased when the radioactive concentration of the processed substance is equal to or less than the purification reference value and exceeds the purification reference proximity threshold. Contaminant purification system.   6. The contaminant purification system according to claim 4 or 5, wherein the cleaning capability of the cleaning processing apparatus is enhanced by reducing the amount of the processing substance cut out by the quantitative supply means. The cleaning treatment apparatus includes a substance amount detection means for detecting a substance amount in the hopper,
When the amount of the substance in the hopper exceeds a preset limit amount, charging of the processable substance from the first separation device to the hopper of the cleaning processing device is stopped. Item 7. The contaminant purification system according to any one of Items 3 to 6. Comprising an informing means for informing an error;
After stopping the introduction of the processable substance from the first fractionation device to the hopper of the cleaning processing apparatus, the state in which the amount of the substance in the hopper exceeds the limit amount continues for a predetermined time. 8. The contaminant purification system according to claim 7, wherein an error is notified from the notification means.

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