JP6127113B1 - Radioactive contaminant treatment method and radioactive contaminant treatment facility - Google Patents

Abstract

A processing method for efficiently separating radioactive cesium from radioactive contaminants is provided. A solid waste contaminated with radioactive cesium is not only incinerated in an incinerator 1 but also injecting contaminated water contaminated with radioactive cesium into the incinerator 1. In this way, since radioactive cesium can be separated from solid waste contaminated with radioactive cesium and contaminated water at the same time, when solid waste contaminated with radioactive cesium and contaminated water are separately purified Compared with, a large amount of radioactive cesium can be recovered efficiently. This can contribute to cost reduction. [Selection] Figure 1

Description

  The present invention relates to a method for treating radioactive contaminants and a facility for treating radioactive contaminants.

  In recent years, various methods and facilities for purifying solid waste and contaminated water contaminated with radioactive cesium have been developed.

  For example, in Patent Document 1, the solid waste is incinerated in an incinerator, gaseous radioactive cesium contained in the exhaust gas discharged from the incinerator is reduced in temperature and dissolved in well water, and an adsorbent is added to the aqueous solution. In addition, the adsorbent is adsorbed with radioactive cesium ions to cause the adsorbent to coagulate and precipitate.

  For example, in Patent Document 2, sewage sludge is incinerated in an oxidizing atmosphere of an incinerator, exhaust gas discharged from the incinerator is guided to a high-temperature cyclone, and most of the incinerated ash is collected at high temperature with a low radioactive cesium content. The radioactive cesium separated and recovered as dust ash and volatilized in the exhaust gas that has passed through the high-temperature cyclone is recaptured in the incineration ash during the temperature lowering process. Separated and collected as dust collection ash.

  Furthermore, in Patent Document 3, for example, the contaminated fly ash generated from the incinerator and water are eluted to generate an eluent, and this eluent is removed from the first treatment liquid from which solids have been removed and the radioactive cesium removed. Separated into dyes, the radioactive cesium in the first treatment liquid is adsorbed onto the adsorbent.

  By the way, it is known that contaminated water contaminated with radioactive cesium is adsorbed and separated with an adsorbent such as zeolite, and disposed together with the adsorbent.

JP 2013-101098 A JP 2013-248548 A JP2015-96810A

  In the above Patent Documents 1 to 3, the radioactive cesium in the exhaust gas discharged from the incinerator is treated, but the treatment becomes difficult in a place where a large amount of well water cannot be secured.

  In Patent Documents 1 to 3, it is not possible to know in detail how to purify contaminated water contaminated with radioactive cesium simultaneously with the solid waste contaminated with radioactive cesium. There is room for improvement here.

  In view of such circumstances, an object of the present invention is to efficiently separate radioactive cesium from solid waste and contaminated water contaminated with radioactive cesium in a method for treating radioactive contaminants. Another object of the present invention is to efficiently separate radioactive cesium from solid waste contaminated with radioactive cesium and contaminated water in a treatment facility for radioactive contaminants.

The method for treating radioactive contaminants according to the present invention comprises incinerating solid waste contaminated with radioactive cesium in an incinerator, injecting contaminated water contaminated with radioactive cesium into the incinerator, and the incinerator. Treatment to reduce the temperature of the exhaust gas discharged from the exhaust gas to a temperature at which the radioactive cesium volatilized in the exhaust gas is sublimated to a solid, and to collect the radioactive cesium remaining in the reduced exhaust gas together with fly ash In the process of reducing the temperature of the exhaust gas, the contaminated water or well water contaminated with radioactive cesium is injected into the exhaust gas to evaporate water and lower the temperature of the exhaust gas. together, radioactive cesium is dissolved radioactive cesium and the contaminated water is stripped to the flue gas in the form to sublime the solid, and wherein the To have.

  In this configuration, since radioactive cesium can be separated from solid waste contaminated with radioactive cesium and contaminated water at the same time, solid waste contaminated with radioactive cesium and contaminated water are separately purified. Compared with, a large amount of radioactive cesium can be recovered efficiently. Thereby, it becomes possible to reduce the cost required for purification of radioactive contaminants.

Moreover, in the said structure, the radioactive cesium volatilized by the waste gas discharged | emitted from the said incinerator is made into solid by reducing temperature, and it is made to collect with fly ash. As a result, radioactive cesium can be recovered without using an adsorbent.

Furthermore, in the said structure, when sublimating the radioactive cesium volatilized by the waste gas discharged | emitted from the said incinerator to a solid, the contaminated water contaminated with the radioactive cesium is utilized.

  As a result, even in an environment where a large amount of well water as described in the conventional example cannot be used, contaminated water contaminated with radioactive cesium can be used instead of the well water. Radioactive cesium can be recovered efficiently.

  Preferably, in the method for treating radioactive contaminants according to the present invention, the collected solid radioactive cesium and fly ash are washed with the contaminated water so that the water-soluble substance containing the radioactive cesium is dissolved in water. A process of separating the aqueous solution into solids and water containing the water-soluble substance, and injecting the separated water and the contaminated water or well water into the dehumidified exhaust gas, And further reducing the temperature of the exhaust gas to sublimate the radioactive cesium contained in the water-soluble substance and the contaminated water into a solid, and solid radioactive cesium accompanying the further reduced temperature exhaust gas. And a process of collecting the gas.

  In this configuration, radioactive cesium volatilized in the exhaust gas discharged from the incinerator is recovered in stages, and a large amount of well water and adsorbent as described in the conventional example are not used in each stage. Therefore, more radioactive cesium can be recovered at a relatively low cost.

Further, the radioactive pollutant treatment facility according to the present invention recovers the radioactive cesium from solid waste contaminated with radioactive cesium and contaminated water contaminated with radioactive cesium, the solid waste An incinerator for incineration, a contaminated water supply device for injecting the contaminated water contaminated with the radioactive cesium into the incinerator, and the temperature of the exhaust gas discharged from the incinerator , the radioactive cesium volatilized in the exhaust gas A cooling means for lowering the temperature to sublimate the solid, a dust collector for collecting radioactive cesium remaining in the exhaust gas reduced in temperature by the cooling means together with fly ash, and moisture for injecting well water to the cooling means And the cooling means injects the contaminated water supplied from the contaminated water supply device or the well water supplied from the moisture supply device to the exhaust gas. With water is evaporated to lower the temperature of the exhaust gas, radioactive cesium is dissolved radioactive cesium and the contaminated water is stripped to the flue gas to sublime the solid is characterized in that.

In the above configuration, since radioactive cesium can be separated simultaneously from solid waste contaminated with radioactive cesium and contaminated water, the solid waste contaminated with radioactive cesium and contaminated water are separately purified. Compared to the case, a large amount of radioactive cesium can be recovered efficiently. Thereby, it becomes possible to reduce the cost required for purification of radioactive contaminants.

Furthermore, in the said structure, the radioactive cesium volatilized by the waste gas discharged | emitted from the said incinerator is made into a solid by reducing temperature, and it is made to collect with fly ash. As a result, radioactive cesium can be recovered without using an adsorbent.

Furthermore, in the said structure, when sublimating the radioactive cesium volatilized by the waste gas discharged | emitted from the said incinerator to solid, the contaminated water contaminated with the radioactive cesium is utilized.

  As a result, even in an environment where a large amount of well water as described in the conventional example cannot be used, contaminated water contaminated with radioactive cesium can be used instead of the well water. Radiocesium can be recovered.

  Preferably, the treatment facility for radioactive contaminants according to the present invention is the contaminated water supplied from the contaminated water supply device with water-soluble substances such as collected solid radioactive cesium and radioactive cesium contained in fly ash. By dissolving, a dissolving means for dissolving the water-soluble substance containing solid radioactive cesium in water to form an aqueous solution, and a solid substance for separating the aqueous solution prepared by the dissolving means into a solid substance and moisture containing the water-soluble substance. The liquid separation means, the water separated by the solid-liquid separation means and the contaminated water supplied from the contaminated water supply device or the well water supplied from the water supply device are injected into the exhaust gas reduced in temperature by the cooling means. As a result, the temperature of the exhaust gas is further reduced by evaporating moisture, and the radioactive cesium contained in the water-soluble substance and the contaminated water is sublimated into a solid. And next cooling means 2 and the primary precipitator for collecting radioactive cesium solids entrained reduced temperature by exhaust gas in the secondary cooling means may be a further comprising configure.

  In this configuration, radioactive cesium volatilized in the exhaust gas discharged from the incinerator is recovered in stages, and a large amount of well water and adsorbent as described in the conventional example are not used in each stage. Therefore, more radioactive cesium can be recovered at a relatively low cost.

  According to the method for treating radioactive contaminants according to the present invention, since radioactive cesium can be separated simultaneously from solid waste contaminated with radioactive cesium and contaminated water, solid waste contaminated with radioactive cesium and A large amount of radioactive cesium can be efficiently recovered as compared with the case of separately purifying contaminated water. Thereby, it becomes possible to reduce the cost required for purification of radioactive contaminants.

  Further, according to the method for treating radioactive contaminants according to the present invention, it becomes possible to recover the radioactive cesium separated in the incinerator without using excessive well water and adsorbent. The cost required for processing can be reduced as much as possible.

  In addition, according to the radioactive pollutant treatment facility according to the present invention, since radioactive cesium can be separated simultaneously from solid waste contaminated with radioactive cesium and contaminated water, solid waste contaminated with radioactive cesium. A large amount of radioactive cesium can be efficiently recovered as compared with the case of separately purifying substances and contaminated water. Thereby, it becomes possible to reduce the cost required for purification of radioactive contaminants.

  Further, according to the method for treating radioactive contaminants according to the present invention, it becomes possible to recover the radioactive cesium separated in the incinerator without using excessive well water and adsorbent. The cost required for processing can be reduced as much as possible.

It is a figure which shows typically the structure of one Embodiment of the processing equipment of the radioactive contaminant which concerns on this invention. It is a figure which shows typically the structure of other embodiment of the processing equipment of the radioactive contaminant which concerns on this invention. It is a figure which shows typically the structure of other embodiment of the processing equipment of the radioactive contaminant which concerns on this invention. It is a figure which shows typically the structure of other embodiment of the processing equipment of the radioactive contaminant which concerns on this invention.

  BEST MODE FOR CARRYING OUT THE INVENTION Best modes for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of the present invention. The illustrated radioactive contaminant treatment facility includes an incinerator 1, a purification treatment device 2, an induction fan 3, and a chimney 4.

  The incinerator 1 burns solid waste contaminated with radioactive cesium and contaminated water contaminated with radioactive cesium, and the type of the incinerator is not limited. The solid waste is supplied from the waste supply device 5, and the contaminated water is supplied from the contaminated water supply device 11.

  In the incinerator 1, the solid waste and the contaminated water are burned at a high temperature of 850 ° C. or higher (for example, 900 ° C.), so that the radioactive cesium is volatilized in the exhaust gas from the solid waste and the contaminated water. Therefore, the amount of radioactive cesium contained in combustion residue, that is, main ash is reduced. For this reason, the main ash discharged | emitted from the incinerator 1 is transferred to the management type | mold disposal site 6 which can process a radioactive substance stably.

  The purification treatment device 2 cools and purifies the exhaust gas discharged from the incinerator 1 and includes a contaminated water supply device 11, a water supply device 12, a primary cooling device 13, a primary filtration dust collector 14, 1st chemical | medical agent supply apparatus 15, 1st dust carrying-out apparatus 21, dissolution tank 22, solid-liquid separator 23, secondary cooling device 31, secondary filtration type dust collector 32, 2nd chemical | medical agent supply apparatus 33, 2nd dust carrying out The apparatus 41, the cement solidifying apparatus 42, etc. are provided.

  The primary cooling device 13 evaporates moisture by injecting contaminated water or well water contaminated with radioactive cesium into exhaust gas having a temperature of 850 ° C. or higher (eg, 900 ° C.) discharged from the incinerator 1. The temperature of the exhaust gas is lowered to a temperature (for example, about 500 ° C.) that sublimates the radioactive cesium into a solid, and the radioactive cesium that is volatilized in the exhaust gas at a high concentration or the radioactive cesium dissolved in the contaminated water is solid. The exhaust gas in which the concentration of radioactive cesium is lowered due to the temperature reduction is discharged to the primary filtration dust collector 14, while the ash containing solid radioactive cesium is first discharged. It is discharged to the dust carry-out device 21. The contaminated water is supplied from the contaminated water supply device 11, and the well water is supplied from the moisture supply device 12.

  The exhaust gas discharged from the primary cooling device 13 contains not only the solidified radioactive cesium but also harmful acidic gas components (HCl, SOx, etc.). In the primary passage 16 that guides the exhaust gas to the primary filtration dust collector 14, a chemical (for example, caustic soda, baking soda, etc.) for neutralizing harmful acidic gas components in the exhaust gas is supplied by the first chemical supply device 15. It comes to blow.

  The primary filtration dust collector 14 is a ceramic filter or the like, and collects radioactive cesium and fly ash remaining in the exhaust gas reduced in temperature by the primary cooling device 13 and flows in along with the exhaust gas. The filtered chemical exhaust gas is discharged to the secondary cooling device 31 on the downstream side, and the collected radioactive cesium and fly ash are discharged to the first dust carry-out device 21.

  The water-soluble substances such as solid radioactive cesium discharged to the first dust carry-out device 21 and radioactive cesium contained in the fly ash are washed with the contaminated water supplied from the contaminated water supply device 11 in the dissolution tank 22, thereby the above-mentioned. A water-soluble substance is dissolved in water, and this aqueous solution is sent to the solid-liquid separator 23.

  In the solid-liquid separation device 23, the aqueous solution is separated into solids and water containing the water-soluble substances, and the solids are transferred to the management-type disposal site 6, and the water containing the water-soluble substances is subjected to secondary cooling. Supply to device 31.

  The secondary cooling device 31 is contaminated water contaminated with radioactive cesium supplied from the contaminated water supply device 11 or well water supplied from the water supply device 12 to the exhaust gas discharged from the primary filtration dust collector 14. And the moisture separated by the solid-liquid separation device 23 is evaporated to further evaporate the moisture and further reduce the temperature of the exhaust gas to 200 ° C. or lower (for example, about 180 ° C.). The radioactive cesium dissolved in the contaminated water and the water-soluble substance contained in the water are sublimated into a solid, and the concentration of radioactive cesium is lowered by the temperature reduction. The exhaust gas thus discharged is discharged to the secondary filtration dust collector 32, while the ash containing solid radioactive cesium is discharged to the second dust carry-out device 41.

  It should be noted that harmful acidic gas components (HCl, SOx, etc.) remain in the exhaust gas discharged from the secondary cooling device 31. A chemical that adsorbs radioactive cesium remaining in the exhaust gas (for example, zeolite) is blown into the secondary passage 34 that guides the exhaust gas to the secondary filtration dust collector 32 by the second chemical supply device 33. It has become.

  The secondary filtration dust collector 32 is made of a bag filter or the like, collects radioactive cesium and fly ash remaining in the exhaust gas reduced in temperature by the secondary cooling device 31, and collects the chemical flowing in with the exhaust gas. The filtered exhaust gas is sucked by the induction fan 3 and discharged from the chimney 4 to the atmosphere, while the collected radioactive cesium and fly ash are discharged to the second dust carry-out device 41.

  The radioactive cesium and fly ash discharged to the second dust carry-out device 41 are solidified with cement by the cement solidifying device 42 and then transferred to the final disposal site 7 for low-level radioactive contaminants.

  Next, a treatment method using the radioactive contaminant treatment facility according to this embodiment will be described.

  The solid waste contaminated with radioactive cesium is put into the incinerator 1 from the waste supply device 5 and the contaminated water contaminated with radioactive cesium is injected from the contaminated water supply device 11, whereby the solid waste As the waste is combusted, the solid waste and the water of the contaminated water are evaporated, and the main ash is discarded from the lower side of the incinerator 1 to the managed disposal site 6 while the exhaust gas is incinerator 1. Is discharged to the primary cooling device 13 from above. The supply amount of the contaminated water here is set to an amount that does not significantly reduce the combustion temperature required in the incinerator 1.

  Here, in the incinerator 1, the solid waste and the contaminated water are burned at a high temperature of 850 ° C. or higher (for example, 900 ° C.), so that it is dissolved in the radioactive cesium contained in the solid waste and the contaminated water. The radioactive cesium contained in the exhaust gas is volatilized in the exhaust gas, so that the amount of radioactive cesium contained in the combustion residue, that is, the main ash becomes very small. The concentration of radioactive cesium contained in the main ash is, for example, 8000 Bq / kg or less. Therefore, the main ash can be transferred to the managed disposal site 6. On the other hand, since the radioactive cesium contained in the solid waste and the radioactive cesium dissolved in the contaminated water are both volatilized in the exhaust gas, the concentration of the radioactive cesium volatilized in the exhaust gas is very high. Get higher.

  Next, in the primary cooling device 13, by injecting contaminated water or well water contaminated with radioactive cesium to the introduced exhaust gas, moisture is evaporated and the temperature of the exhaust gas is reduced to, for example, 500 ° C. At the same time, high-concentration radioactive cesium volatilized in the exhaust gas and radioactive cesium dissolved in the contaminated water are sublimated to a solid. The supply amount of the contaminated water or well water to the primary cooling device 13 is set to an amount that does not make the primary temperature drop more than necessary.

  While the ash containing radioactive cesium solidified by reducing the temperature in this way is discharged to the first dust carrying-out device 21, the exhaust gas having a low concentration of radioactive cesium is discharged into the primary filtration dust collector 14 Discharge towards

  The primary passage 16 on the upstream side of the primary filtration dust collector 14 is supplied with a chemical (for example, caustic soda, baking soda, etc.) for neutralizing harmful acidic gas components in the exhaust gas flowing therethrough as the first chemical. Blow continuously from device 15. The supply amount of the drug is the optimum amount of drug required for one cycle of filtration operation time.

  The chemical flowing into the primary filtration dust collector 14 together with the exhaust gas adheres to the filter cloth of the primary filtration dust collector 14, and radioactive cesium and fly ash remaining in the exhaust gas introduced by the filter cloth. Is collected and filtered. In the primary filtration dust collector 14, the filtered exhaust gas is discharged to the secondary cooling device 31, while the collected solid radioactive cesium and fly ash are discharged to the first dust carry-out device 21.

  Here, first, solid radioactive cesium and fly ash discharged from the primary cooling device 13 and the primary filtration dust collector 14 into the first dust carry-out device 21 are supplied from the contaminated water supply device 11 in the dissolution tank 22. An aqueous solution is made by dissolving in supplied contaminated water. Thereafter, the aqueous solution is separated into solids and water containing water-soluble substances in the solid-liquid separator 23, and the solids are transferred to the managed disposal site 6, while the water containing the water-soluble substances is secondary. It is supplied to the cooling device 31.

  In the secondary cooling device 31, the exhaust gas discharged from the primary filtration dust collector 14 is supplied from the contaminated water or moisture supply device 12 contaminated with radioactive cesium supplied from the contaminated water supply device 11. While injecting well water and injecting and supplying water separated by the solid-liquid separator 23, the water is evaporated to further reduce the temperature of the exhaust gas to 200 ° C. or lower (for example, about 180 ° C.), and the exhaust gas The radioactive cesium contained therein and the radioactive cesium dissolved in the contaminated water are sublimated into a solid. Here, sodium chloride or calcium chloride dissolved in the contaminated water is sublimated to fly ash. The supply amount of the contaminated water or well water to the secondary cooling device 31 is set to an amount that does not make the secondary temperature drop more than necessary.

  The ash containing the radioactive cesium solidified by the temperature reduction is discharged to the second dust carry-out device 41, while the remaining exhaust gas containing the radioactive cesium is filtered by the secondary filtration type dust collector 32. To discharge.

  In the secondary passage 34 on the upstream side of the secondary filtration dust collector 32, a chemical (for example, zeolite) adsorbing radioactive cesium remaining in the exhaust gas flowing therethrough is supplied from the second chemical supply device 33. Blow continuously. In addition, it is also possible to pre-coat the said chemical | medical agent on the filter cloth surface of the secondary filtration type dust collector 32. FIG.

  The chemical flowing into the secondary filtration dust collector 32 together with the exhaust gas adheres to the filter cloth of the secondary filtration dust collector 32, and radioactive cesium and fly ash accompanying the exhaust gas introduced by the filter cloth. Is collected and filtered. In the secondary filtration dust collector 32, the filtered exhaust gas is sucked by the induction fan 3 and discharged from the chimney 4 to the atmosphere, while the collected solid radioactive cesium and fly ash are removed from the second dust discharge device 41. To discharge.

  The radioactive cesium and fly ash discharged to the second dust carry-out device 41 are solidified with cement by the cement solidifying device 42 and then transferred to the final disposal site 7.

  As described above, according to the embodiment to which the present invention is applied, when burning solid waste contaminated with radioactive cesium in the incinerator 1, by evaporating the contaminated water contaminated with radioactive cesium, When the radioactive cesium is separated from the solid waste and the contaminated water at the same time, and the exhaust gas discharged from the incinerator 1 is gradually reduced in temperature by the primary and secondary cooling devices 13 and 31. In addition, radioactive cesium is separated from the contaminated water by using contaminated water contaminated with radioactive cesium.

  Thus, a large amount of radioactive cesium separated in the incinerator 1 is recovered in stages in the purification treatment apparatus 2 without using a large amount of well water and adsorbent as described in the conventional example.

  From these things, compared with the case where solid waste and contaminated water are separately purified as in the conventional example, a large amount of radioactive cesium can be efficiently recovered. Therefore, the cost required for the purification process of radioactive contaminants can be reduced as much as possible.

  In particular, in this embodiment, even in an environment where a large amount of well water cannot be used, contaminated water contaminated with radioactive cesium can be used in place of the well water. Therefore, radioactive cesium can be produced at a relatively low cost. It becomes possible to collect efficiently.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  (1) FIG. 2 shows another embodiment of the present invention. In this embodiment, the primary cooling device 13 of the embodiment shown in FIG. 1 is a waste heat boiler.

  The waste heat boiler as the primary cooling device 13 reduces the temperature of exhaust gas by recovering the heat of the hot exhaust gas discharged from the incinerator 1 and generating electric power.

  That is, in this embodiment, the primary cooling device 13 composed of the waste heat boiler does not use contaminated water or well water as in the embodiment shown in FIG. 1, but the electric power generated by the primary cooling device 13 is It can contribute to the reduction of running cost, such as being able to use with the processing equipment in this embodiment.

  (2) FIG. 3 shows another embodiment of the present invention. In this embodiment, the secondary cooling device 31 of the embodiment shown in FIG. 1 is eliminated.

  In the case of this embodiment, since it is necessary to increase the temperature reduction amount by the primary cooling device 13 as much as possible, a large amount of contaminated water is required by the primary cooling device 13. From this, it can be said that according to this embodiment, the purification capacity of contaminated water is enhanced.

  (3) FIG. 4 shows another embodiment of the present invention. In this embodiment, the primary cooling device 13 of the embodiment shown in FIG. 1 is a waste heat boiler, and the primary filtration dust collector 14 of the embodiment shown in FIG. 1 is used as the secondary cooling device 31 and the secondary filtration. It is relocated between the type dust collector 32.

  The waste heat boiler as the primary cooling device 13 reduces the temperature of exhaust gas by recovering the heat of the hot exhaust gas discharged from the incinerator 1 and generating electric power.

  That is, in this embodiment, the primary cooling device 13 composed of the waste heat boiler does not use contaminated water or well water as in the embodiment shown in FIG. 1, but the electric power generated by the primary cooling device 13 is It can contribute to the reduction of running cost, such as being able to use with the processing equipment in this embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a treatment method and treatment equipment for simultaneously purifying solid waste and contaminated water contaminated with radioactive cesium.

1 Incinerator 2 Purification device
11 Contaminated water supply device
12 Moisture supply device
13 Primary cooling device
14 Primary filtration dust collector
22 Dissolution tank
23 Solid-liquid separator
31 Secondary cooling device
32 Secondary filtration type dust collector 3 Induction fan 4 Chimney 5 Waste supply device 6 Managed disposal site 7 Final disposal site

Claims (4)

Incinerating solid waste contaminated with radioactive cesium in an incinerator, and injecting contaminated water contaminated with radioactive cesium into the incinerator ;
Treatment for reducing the temperature of the exhaust gas discharged from the incinerator to a temperature for sublimating radioactive cesium volatilized in the exhaust gas into a solid;
A process of collecting radioactive cesium remaining in the reduced exhaust gas together with fly ash ,
In the process of reducing the temperature of the exhaust gas, by injecting the contaminated water or well water contaminated with radioactive cesium into the exhaust gas, the water is evaporated to lower the temperature of the exhaust gas, and is volatilized in the exhaust gas. A method for treating radioactive contaminants , wherein the radioactive cesium and the radioactive cesium dissolved in the contaminated water are sublimated into a solid . In the processing method of the radioactive contaminant of Claim 1,
A process of dissolving the collected solid radioactive cesium and fly ash with the contaminated water to dissolve the water-soluble substance containing the radioactive cesium in water to form an aqueous solution;
A process of separating the aqueous solution into solids and water containing the water-soluble substance;
By injecting the separated water and the contaminated water or well water into the temperature-reduced exhaust gas, the water is evaporated to further reduce the temperature of the exhaust gas, and the water-soluble substance and the contaminated water contain the water. A process of sublimating radioactive cesium into a solid;
A method for treating radioactive contaminants, further comprising: collecting solid radioactive cesium associated with the further reduced temperature exhaust gas . A radioactive contaminant treatment facility for recovering the radioactive cesium from solid waste contaminated with radioactive cesium and contaminated water contaminated with radioactive cesium,
An incinerator for incinerating the solid waste;
A contaminated water supply device for injecting contaminated water contaminated with the radioactive cesium into the incinerator;
A cooling means for reducing the temperature of the exhaust gas discharged from the incinerator to a temperature at which radioactive cesium volatilized in the exhaust gas is sublimated into a solid;
A dust collector for collecting radioactive cesium remaining in the exhaust gas reduced in temperature by the cooling means together with fly ash;
A water supply device for injecting well water into the cooling means,
The cooling means sprays contaminated water supplied from the contaminated water supply device or well water supplied from the moisture supply device to the exhaust gas, thereby evaporating moisture and lowering the temperature of the exhaust gas. Radioactive cesium volatilized in the exhaust gas or radioactive cesium dissolved in the contaminated water is sublimated into a solid, and the radioactive contaminant treatment facility is characterized by the following. In the radioactive contamination processing facility according to claim 3 ,
A water-soluble substance containing the solid radioactive cesium is washed by washing the water-soluble substance such as the collected radioactive cesium and radioactive cesium contained in the fly ash with the contaminated water supplied from the contaminated water supply device. Dissolving means for dissolving in water to make an aqueous solution;
Solid-liquid separation means for separating the aqueous solution produced by the dissolution means into solids and water containing the water-soluble substance;
By injecting the moisture separated by the solid-liquid separation means and the contaminated water supplied from the contaminated water supply device or the well water supplied from the moisture supply device into the exhaust gas dehydrated by the cooling means, A secondary cooling means for further reducing the temperature of the exhaust gas by evaporating the water-soluble substance and radioactive cesium contained in the contaminated water into a solid;
Processing facilities of radioactive contaminants, characterized in that it comprises 2 and secondary dust collector for collecting the radioactive cesium solids entrained reduced temperature by exhaust gas in the secondary cooling means, a further.

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