JP6474160B2 - Method and apparatus for treating radioactive cesium contaminated water - Google Patents

Description

  The present invention relates to a method of treating contaminated water containing radioactive cesium at a low cost without using an adsorbent or the like.

  In order to efficiently treat contaminated water containing a large amount of radioactive cesium, etc., Patent Document 1 discloses that iron ferrocyanide that adsorbs radionuclides containing radioactive cesium and a zeolite-based adsorbent are added to the radioactive contaminated water and mixed. Stir, add inorganic flocculant, add organic flocculant aqueous solution and mix, granulate solids containing ferric ferrocyanide and zeolite adsorbent, and mix the resulting liquid mixture with thickener device Describes a technique for solid-liquid separation by sedimentation separation.

  In Patent Document 2, a mordenite-type zeolite containing titanium oxide is added to contaminated water containing radioactive cesium or the like, and the mixture is stirred under conditions of pH 8.5 to 9.5 to adsorb the radioactive substance to the zeolite. After that, a technique of coagulating and precipitating with a polymer flocculant is described.

  Furthermore, Patent Document 3 describes a technique for adsorbing and removing radioactive cesium from contaminated water containing radioactive cesium using a magnetic adsorbent obtained by binding zeolite and ferrocyanide and magnetic particles.

JP2013-57599A JP 2013-246139 A JP 2014-74695 A

  The above-mentioned radioactive cesium removal technique uses an adsorbent, and thus requires a step of stirring the contaminated water and the adsorbent and a step of separating the adsorbent from the contaminated water, resulting in a problem that the apparatus becomes complicated. In addition, the operation cost is increased due to the addition of the adsorbent.

  Accordingly, the present invention has been made in view of the above-mentioned problem, and it is possible to effectively utilize existing heat and equipment, and does not require a complicated processing apparatus or adsorbent, and is low-contaminated water containing radioactive cesium. The purpose of processing.

  In order to achieve the above object, the present invention is a method for treating radioactive cesium-contaminated water, which heats waste contaminated with radioactive cesium, cools the heated gas, and removes dust from the cooled gas. In the radioactive cesium recovery process for recovering dust containing radioactive cesium, contaminated water containing radioactive cesium is introduced into the heated gas.

  According to the present invention, the contaminated water containing radioactive cesium is introduced into the heated gas contaminated with radioactive cesium, the moisture of the contaminated water is evaporated by sensible heat of the exhaust gas, and then cooled to solidify the radioactive cesium as a solid. Since it is possible to effectively recover existing waste heat and use existing recovery equipment, there is no need to install a new complicated processing device, and no adsorbent is required, resulting in low cost. Can treat radioactive cesium-contaminated water and reduce the volume.

  In the method for treating radioactive cesium-contaminated water, the contaminated water containing the radioactive cesium can be a wastewater generated when the waste contaminated with the radioactive cesium is washed with water, and the waste is contaminated with radioactive cesium. The water-soluble radioactive cesium contained in the product can be removed beforehand by washing with water before the heat treatment, reducing the chlorine source, etc., which is a reaction accelerator for radioactive cesium, and stabilizing the heating device. Driving can be maintained.

  Further, the waste water containing the radioactive cesium is separated from the dust contained in the gas after cooling into coarse powder and fine powder, and the separated coarse powder is treated as a waste water, and this waste water is generated. It is not necessary to perform this process separately.

  Furthermore, the present invention is a treatment apparatus for radioactive cesium-contaminated water, a heating furnace for heating waste contaminated with radioactive cesium, a dust collector for collecting dust contained in exhaust gas from the heating furnace, and radioactive cesium And a charging device for charging the contaminated water into the exhaust gas of the heating furnace.

  According to the present invention, the contaminated water containing radioactive cesium is introduced into the exhaust gas of the heating furnace that heats the waste contaminated with radioactive cesium, and the moisture of the contaminated water is evaporated by sensible heat of the exhaust gas. Since it can be solidified and recovered with a dust collector, existing waste heat can be used effectively, and existing recovery equipment can be used, so there is no need to install a new complex processing device, and no adsorbent is required. It can reduce the volume of radioactive cesium-contaminated water at low cost.

  The apparatus for treating radioactive cesium-contaminated water further includes a cooling device for cooling the exhaust gas of the heating furnace, and the charging device inputs the contaminated water containing the radioactive cesium into the cooling device as cooling water for the cooling device. The amount of cooling water used in the cooling device can be reduced.

  Moreover, the said radioactive cesium contaminated water processing apparatus supplies the coarse powder separated by the classifier which isolate | separates the dust contained in the waste gas of the said heating furnace into coarse powder and fine powder, and this classifier to the said heating furnace. The fine powder separated by the classifier is collected by the dust collector, and the contaminated water containing the radioactive cesium can be put into the exhaust gas of the classifier. Thereby, the amount of radioactive cesium circulating with the coarse powder can be reduced, and the removal rate of radioactive cesium and the treatment efficiency of contaminated water containing radioactive cesium can be increased.

  Furthermore, the radioactive cesium contaminated water treatment apparatus includes a water washing apparatus for washing the coarse powder, and the contaminated water containing the radioactive cesium can be used as wastewater generated by the water washing apparatus. It is not necessary to perform it separately.

  A rotary kiln can be used as the heating furnace. In general, a rotary kiln has a high exhaust gas temperature, a large amount of exhaust gas, and a large scale of equipment, and therefore requires a large amount of cooling water, so that a large amount of contaminated water can be treated.

  As described above, according to the present invention, it is possible to treat radioactive cesium-contaminated water at a low cost without requiring a complicated treatment apparatus or adsorbent.

It is the schematic which shows 1st Embodiment of the processing apparatus of radioactive cesium contaminated water which concerns on this invention. It is the schematic which shows 2nd Embodiment of the processing apparatus of radioactive cesium contaminated water which concerns on this invention. It is the schematic which shows 3rd Embodiment of the processing apparatus of radioactive cesium contaminated water which concerns on this invention. It is the schematic which shows 4th Embodiment of the processing apparatus of radioactive cesium contaminated water which concerns on this invention. It is the schematic which shows 5th Embodiment of the processing apparatus of radioactive cesium contaminated water which concerns on this invention.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following description, radioactive cesium refers to cesium 134 and cesium 137, which are radioactive isotopes of cesium. In addition, contaminated water containing radioactive cesium (hereinafter abbreviated as “contaminated water”) refers to the washing of seawater, groundwater, soil contaminated with radioactive substances containing radioactive cesium, etc. This refers to contaminated water generated during the process.

  FIG. 1 shows a first embodiment of a treatment apparatus for radioactive cesium-contaminated water according to the present invention. This treatment apparatus 1 heats waste W such as soil and incinerated ash contaminated with radioactive cesium. A heating furnace 2 that reduces the volume of the waste W or volatilizes radioactive cesium from the waste W, a boiler 3 that uses the heat of the exhaust gas G1 of the heating furnace 2, and a cooling device 4 that cools the exhaust gas G2 of the boiler 3 The dust collector 5 removes dust from the exhaust gas G3 of the cooling device 4, and the induction fan 6 that guides the exhaust gas G4 of the dust collector 5 to the chimney 7. Note that illustration and description of the exhaust gas treatment facility for treating the exhaust gas G4 of the dust collector 5 are omitted.

  The heating furnace 2 is a stoker type / fluidized bed type incinerator, an electric type / combustion type melting furnace, a shaft type / fluidized bed type gasification melting furnace, a rotary kiln type firing furnace, and the like. As the boiler 3, the cooling device 4, and the dust collector 5, a general device attached to the heating furnace 2 can be used.

  Next, a method for treating radioactive cesium-contaminated water according to the present invention using the treatment apparatus 1 having the above configuration will be described with reference to FIG.

  Waste W such as soil and incinerated ash contaminated with radioactive cesium is put into the heating furnace 2 and heated at 800 ° C. to 1550 ° C. to obtain a heated product H such as slag. This heated product H can be effectively used as earthwork material, for example, if it is landfilled at a managed final disposal site or if radioactive cesium is removed.

  The radioactive cesium contained in the waste W is volatilized in the heating furnace 2 as at least a part of the radioactive cesium as a gas. After the exhaust gas G1 of the heating furnace 2 is supplied to the boiler 3 and heat is recovered, it is introduced into the cooling device 4 as the exhaust gas G2.

  The contaminated water PW is put into the cooling device 4 to quench the exhaust gas G2. Thereby, the cesium contained in the exhaust gas G2 becomes solid cesium. On the other hand, the moisture of the contaminated water PW evaporates due to the sensible heat of the exhaust gas G2, and the radioactive cesium in the contaminated water PW is solidified.

  The exhaust gas G3 from the cooling device 4 containing the cesium salt generated from the exhaust gas G2 and the contaminated water PW is introduced into the dust collector 5, and the dust D containing the solid concentrated cesium salt is recovered. The recovered dust D can be stored in a concrete container, etc., after further volume reduction treatment by compression, washing, adsorption, etc., if necessary. Waste containing radioactive cesium can be stored outside. The volume can be reduced and stored without leakage.

  After the exhaust gas G4 of the dust collector 5 is treated to remove harmful substances such as acid gas, it is guided to the chimney 7 by the induction fan 6 and released to the atmosphere. In order to reduce the volume of radioactive cesium, it is preferable to collect a dust containing concentrated cesium salt and then treat harmful substances such as acid gas with lime or the like. Further, when the amount of heat for evaporating the contaminated water PW is insufficient, a combustion furnace may be provided as an auxiliary.

  As described above, according to the present embodiment, it is only necessary to put the contaminated water PW into the cooling device 4, so that a complicated processing device and an adsorbent as in the past are not necessary, and the contaminated water PW is reduced in cost. Can be processed.

  Next, a more specific embodiment of the apparatus for treating radioactive cesium-contaminated water according to the present invention will be described with reference to the drawings.

  FIG. 2 shows a second embodiment of the treatment apparatus for radioactive cesium-contaminated water. This treatment apparatus 11 is composed of a raw material blending apparatus 20, a firing apparatus 30, and an exhaust gas treatment apparatus 40.

  The raw material blending device 20 includes a storage tank 21 for storing a calcium oxide source (hereinafter referred to as “CaO source”) as a reaction accelerator for waste W such as soil contaminated with radioactive cesium and incinerated ash, and the reaction accelerator. A storage tank 22 for storing a chlorine source (hereinafter referred to as “Cl source”), a storage tank 23 for storing waste W, and a CaO source, a Cl source and waste W stored in the storage tanks 21 to 23 A metering feeder (not shown) for blending and a storage tank 27 for storing the blended raw material M are provided.

As said CaO source, the thing containing calcium carbonate, quicklime, slaked lime, limestone, dolomite, blast furnace slag, etc. can be used. Examples of the Cl source include calcium chloride (CaCl ₂ ), potassium chloride (KCl), sodium chloride (NaCl), and waste plastics containing chlorine. Among these, CaCl ₂ can effectively remove radioactive cesium. Therefore, it is preferable.

  The firing device 30 is composed of a rotary kiln (heating furnace) 31 and a cooler 32. The rotary kiln 31 ejects fossil fuels such as an inlet 31a to which the prepared raw material M from the raw material preparing device 20 is supplied and pulverized coal. And the burner 31b for baking the preparation raw material M etc. is provided.

  The exhaust gas treatment device 40 is disposed downstream of the firing device 30 and cools the exhaust gas G6 discharged from the rotary kiln 31, a cyclone 42 as a classifier disposed downstream of the cooling device 41, a first A dust collector 46, a second dust collector 47, a denitration device 48 for denitrating the exhaust gas G10 from which dust such as concentrated cesium salt has been removed by both dust collectors 46, 47, and a chimney 49 for releasing the exhaust gas G11 of the denitration device 48 to the atmosphere Consists of.

  The cooling device 41 is provided for cooling the exhaust gas G6 of the rotary kiln 31 and recovering radioactive cesium or the like volatilized from the waste W as a solid. The exhaust gas G6 is cooled by spraying water from a sprinkler 41a installed at the lower end of the cooling device 41. The watering device 41a only needs to have a function that allows the volatilized cesium chloride to be collected in a solid state by adhering it to the dust contained in the exhaust gas G6. Instead of cooling with water, cooling may be performed by introducing cooling air into the cooling device, or water and cooling air may be used in combination.

  The cyclone 42 as a classifier is provided to collect fine powder containing high-concentration radioactive cesium by the first dust collector 46 and collect coarse powder C mainly composed of calcium and silica components from the exhaust gas G7 of the cooling device 41. It is done. The collected coarse powder C is returned to the rotary kiln 31.

  The first dust collector 46 is provided for collecting dust D1 containing concentrated cesium salt or the like from the exhaust gas G8 of the cyclone 42, and a bag filter or the like is used.

  The second dust collector 47 is provided to remove acid gas and the like contained in the exhaust gas G9 after removing cesium salt and the like, and a neutralizer N containing a calcium component is added to the neutralizer addition device (not shown). The dust D2 adsorbed with acid gas and the like is recovered. A bag filter or the like is also used for the second dust collector 47.

The denitration device 48 is provided to inject ammonia gas (NH ₃ ) into the exhaust gas G10 of the second dust collector 47 to reduce NOx to nitrogen and render it harmless.

  Next, a method for treating radioactive cesium-contaminated water according to the present invention using the treatment apparatus 11 having the above configuration will be described with reference to FIG.

  In the raw material blending device 20, the CaO source and Cl source as reaction accelerators and the waste W contaminated with radioactive cesium are drawn out from the storage tanks 21 to 23 and blended to obtain the blended raw material M. Here, the Cl source is prepared so as to be equal to or greater than the radioactive cesium contained in the waste W.

  The prepared raw material M is charged into the rotary kiln 31 from the storage tank 27 through the charging port 31a and fired at 1200 ° C. to 1550 ° C. to obtain a fired product B. The fired product B can be effectively used as, for example, a cement mixed material or an earthwork material. Here, the oxygen partial pressure in the rotary kiln 31 is 3% or more, preferably 5% or more. Thereby, decomposition | disassembly of the sulfur compound in the rotary kiln 31 is suppressed, and since circulation of sulfur content is suppressed, an increase in the amount of neutralizing agent used and an increase in the amount of coating on the rotary kiln 31 and the cooling device 41 are suppressed. be able to.

  Moreover, it is preferable to perform the said preparation and heating so that the calcium oxide density | concentration of the baked product B may be 50 mass% or more. Thereby, since sulfur content is hold | maintained in the baked product B, or it collects as dust D1 of exhaust gas G8 as a sulfur compound in the 1st dust collector 46 mentioned later, circulation of sulfur content can be suppressed further. .

  On the other hand, the radioactive cesium contained in the waste W of the blended raw material M reacts with chlorine generated from the Cl source in the rotary kiln 31 to volatilize as cesium chloride and is contained in the exhaust gas G6. 41.

  The exhaust gas G6 is rapidly cooled by the water sprayed from the sprinkler 41a in the cooling device 41, and the cesium chloride contained in the exhaust gas G6 becomes a solid cesium salt and adheres to dust fine powder.

  Since the coarse dust C contained in the exhaust gas G7 of the cooling device 41 has a low radioactive cesium concentration, it is classified by the cyclone 42 and returned to the rotary kiln 31.

  Then, the contaminated water PW is introduced into the exhaust gas G8 of the cyclone 42. The sensible heat of the exhaust gas G8 can evaporate the water in the contaminated water PW to solidify radioactive cesium as a cesium salt. Moreover, you may throw in the contaminated water PW from the sprinkler 41a of the cooling device 41. FIG. Thus, the exhaust gas G6 of the rotary kiln 31 can be cooled and the water of the contaminated water PW can be evaporated and solidified as a radioactive cesium salt.

  The exhaust gas G8 from the cyclone 42 containing the cesium salt is introduced into the first dust collector 46, and the dust D1 containing the solid concentrated cesium salt is recovered. The recovered dust D1 can be stored in a sealed container such as concrete after being further reduced in volume by compression, washing, adsorption, etc. as necessary. Waste containing radioactive cesium can be stored outside. The volume can be reduced and stored without leakage.

  On the other hand, since the exhaust gas G9 after recovering the concentrated cesium salt contains harmful gases such as acid gas, the neutralizer N is added to the exhaust gas G9 from the neutralizer addition device, and then the second dust collector 47 Then, dust D2 adsorbing acid gas or the like from exhaust gas G9 is recovered. Here, as the neutralizing agent N, one containing at least one selected from the group consisting of slaked lime, quicklime, dolomite, light-burned dolomite and hydroxylated dolomite can be used.

  Since the dust D2 collected by the second dust collector 47 is mainly composed of slaked lime, gypsum, and calcium chloride, it is returned to the raw material blender 20 as a CaO source, Cl source, and Ca source, added to the waste W, and reused. To do.

  If the exhaust gas G10 of the second dust collector 47 contains NOx, the NOx removal device 48 removes it. The cleaned exhaust gas G11 is released to the atmosphere through the chimney 49.

  FIG. 3 shows a third embodiment of a treatment apparatus for radioactive cesium-contaminated water. This treatment apparatus 51 includes a firing apparatus 30 and an exhaust gas treatment apparatus 40 having the same configuration as the treatment apparatus 11, and a raw material blending apparatus. 20 configurations are different.

  The raw material blending device 20 has storage tanks 21 to 23 and 27 having the same configuration as the radioactive cesium-contaminated water treatment device 11, and wastes such as soil contaminated with radioactive cesium and incineration ash stored in the storage tank 23. A water washing device 24 for washing W, a solid-liquid separator 25 for solid-liquid separation of the slurry S from the water washing device 24, and a drying / pulverizing machine 26 for drying and pulverizing the dehydrated cake DC from the solid-liquid separator 25 Prepare.

  Next, a method for treating radioactive cesium-contaminated water according to the present invention using the treatment apparatus 51 having the above configuration will be described with reference to FIG. In addition, description is abbreviate | omitted about what is in common with operation | movement of the processing apparatus 11 of the radioactive cesium contaminated water shown in FIG.

  After the waste W stored in the storage tank 23 is washed with water by the water washing device 24, the slurry W is supplied to the solid-liquid separator 25 as the slurry S to be solid-liquid separated. The obtained dewatered cake DC is supplied to the drying / pulverizing machine 26, dried and pulverized, and the pulverized product CM is supplied to the storage tank 27.

  On the other hand, the filtrate F discharged from the solid-liquid separator 25 is contaminated water containing water-soluble radioactive cesium derived from the waste W, and is supplied to the watering device 41a of the cooling device 41, and the exhaust gas G6 of the rotary kiln 31. The water in the filtrate F can be evaporated and solidified as a radioactive cesium salt. Further, the filtrate F may be introduced into the exhaust gas G8 of the cyclone 42. The moisture of the filtrate F can be evaporated by the sensible heat of the exhaust gas G8 to be solidified as a radioactive cesium salt.

  Thereby, in addition to the effect by the processing apparatus 11 of the radioactive cesium contaminated water shown in FIG. 2, the radioactive cesium concentration of the waste W processed by the baking apparatus 30 can be reduced, and the radioactive cesium concentration of the baking product B can be reduced. In addition to the reduction, the amount of Cl source used as a reaction accelerator can be reduced, leading to stable operation of the rotary kiln 31. Moreover, it leads also to the reduction of the usage-amount of the cooling water used with the water sprinkler 41a.

  FIG. 4 shows a fourth embodiment of a treatment apparatus for radioactive cesium-contaminated water. This treatment apparatus 61 includes a preparation raw material apparatus 20 and a baking apparatus 30 that have the same configuration as the treatment apparatus 11 for radioactive cesium-contaminated water. And the configuration of the exhaust gas treatment facility 40 is different.

  The exhaust gas treatment facility 40 includes a water washing device 43 for washing the coarse powder C collected by the cyclone 42, and a solid-liquid separator 44 for solid-liquid separation of the slurry S1 from the water washing device 43.

  Next, a method for treating radioactive cesium-contaminated water according to the present invention using the treatment apparatus 61 having the above configuration will be described with reference to FIG. In addition, description is abbreviate | omitted about what is in common with operation | movement of the processing apparatus 11 of the radioactive cesium contaminated water shown in FIG.

  After the coarse powder C collected by the cyclone 42 is washed with water by the water washing device 43, it is supplied to the solid-liquid separator 44 as a slurry S1 and separated into solid and liquid. The obtained dewatered cake DC1 is returned to the rotary kiln 31. On the other hand, the filtrate F1 discharged from the solid-liquid separator 44 is contaminated water containing water-soluble radioactive cesium chloride derived from the coarse powder C, and is charged into the exhaust gas G8 of the cyclone 42.

  By washing the coarse powder C with water, not only water-soluble radioactive cesium chloride contained in the coarse powder C is removed, but alkali chloride compounds such as NaCl and KCl that make the coarse powder C easy to melt are introduced into the filtrate F1 side. It can be removed, and when the dehydrated cake DC1 is heated, melting can be prevented and volatilization of radioactive cesium can be promoted. Further, since the dehydrated cake DC1 has a smaller specific surface area than the coarse powder C, it is more difficult to melt.

  Moreover, the radioactive water-soluble cesium chloride contained in the filtrate F1 is made into solid cesium by throwing the filtrate F1 after washing the coarse powder C with water and separating into solid and liquid into the exhaust gas G8 of the cyclone 42. Since it becomes salt and adheres to dust fine powder and is collected by the first dust collector 46, it does not return to the rotary kiln 31. The filtrate F1 may be supplied to the cooling device 41. There is a possibility that CsCl contained in the filtrate F1 adheres to the coarse powder C side of the cyclone 42 and circulates. However, most of the CsCl adheres to the fine powder and is collected by the first dust collector 46. Absent. Thereby, the filtrate F can also be effectively used as cooling water.

  FIG. 5 shows a fifth embodiment of a treatment apparatus for radioactive cesium-contaminated water. This treatment apparatus 71 has the same configuration as that of the treatment apparatus 51 described above, and not only the waste W but also the cyclone is added to the water washing apparatus 24. Only the coarse powder C collected at 42 is supplied from the processing apparatus 51 only.

  In the processing device 71, the slurry S2 from the water washing device 24 is solid-liquid separated by the solid-liquid separator 25, and the dehydrated cake DC2 is supplied to the drying / pulverizer 26 to obtain the pulverized material CM1. On the other hand, the filtrate F2 discharged from the solid-liquid separator 25 is supplied to the watering device 41a of the cooling device 41.

  This pulverized product CM1 is obtained by removing the radioactive water-soluble cesium chloride contained in the waste W and the alkali, chlorine and radioactive water-soluble cesium chloride contained in the coarse powder C on the filtrate F2 side. The radioactive cesium concentration of the fired product B can be further reduced.

  In the above embodiment, the contaminated water or filtrate may contain some solid content. For example, even if contaminated soil is classified using water and a slurry containing clay containing a relatively high concentration of radioactive cesium is sprayed, it can be recovered by a subsequent dust collector. Furthermore, it is not necessary to strictly perform solid-liquid separation when washing waste or coarse powder with water. For example, powder may be mixed somewhat in the filtrate, such as centrifugation or sedimentation. Conversely, the filtrate may be mixed into the solid side to form a slurry. In order to increase the separation accuracy, a filter press may be used for solid-liquid separation.

  In addition, as waste W contaminated with radioactive cesium, soil and incineration ash contaminated with radioactive cesium are illustrated, but besides these, felled trees, waste-derived molten slag, sewage sludge, sewage sludge dry powder, purified water It is possible to cover all wastes such as sludge, construction sludge, sewage slag, shells, vegetation, and debris that contain radioactive cesium. One type in these groups can be used alone, or two or more types Can be combined. Further, an intermediate treatment product enriched with radioactive cesium obtained by removing in advance a portion containing almost no radioactive cesium (sand or stone in the case of soil) is also a waste W contaminated with radioactive cesium in the present invention. include.

DESCRIPTION OF SYMBOLS 1 Radiocesium contaminated water processing apparatus 2 Heating furnace 3 Boiler 4 Cooling apparatus 5 Dust collector 6 Induction fan 7 Chimney 11 Radiocesium contaminated water processing apparatus 20 Raw material preparation apparatuses 21-23, 27 Storage tank 24 Flushing apparatus 25 Solid-liquid separator 26 Drying and grinding machine 30 Baking device 31 Rotary kiln 31a Input port 31b Burner 32 Cooler 40 Exhaust gas treatment device 41 Cooling device 41a Sprinkling device 42 Cyclone 43 Flushing device 44 Solid-liquid separator 46 First dust collector 47 Second dust collector 48 Denitration device 49 Chimney 51 Radiocesium-contaminated water treatment device 61 Radiocesium-contaminated water treatment device 71 Radiocesium-contaminated water treatment device B Firing product C Coarse powder CM, CM1 Crushed material D, D1, D2 Dust DC, DC1, DC2 Dehydrated cake F, F1 , F2 Filtrates G1 to G11 Exhaust gas H Heated product M Preparation raw material N Wettable powders S, S1, S2 (including the radioactive cesium) slurry PW contaminated water W (contaminated with radioactive cesium) Waste

Claims (8)

Heating waste contaminated with radioactive cesium,
Cool the gas after heating,
In the recovery process of radioactive cesium that removes dust from the cooled gas and recovers dust containing radioactive cesium,
A method for treating radioactive cesium-contaminated water, comprising introducing contaminated water containing radioactive cesium into the heated gas.   2. The method for treating radioactive cesium-contaminated water according to claim 1, wherein the contaminated water containing radioactive cesium is wastewater generated when the waste contaminated with the radioactive cesium is washed with water.   The contaminated water containing the radioactive cesium is wastewater generated when the dust contained in the cooled gas is separated into coarse powder and fine powder, and the separated coarse powder is washed with water. The method for treating radioactive cesium-contaminated water according to 1. A heating furnace for heating waste contaminated with radioactive cesium;
A dust collector for collecting dust contained in the exhaust gas of the heating furnace;
An apparatus for treating radioactive cesium-contaminated water, comprising: a charging device for introducing contaminated water containing radioactive cesium into the exhaust gas of the heating furnace.   5. The cooling device according to claim 4, further comprising a cooling device that cools the exhaust gas of the heating furnace, wherein the charging device inputs contaminated water containing the radioactive cesium into the cooling device as cooling water for the cooling device. Radioactive cesium contaminated water treatment equipment. A classifier for separating dust contained in the exhaust gas of the heating furnace into coarse powder and fine powder;
A supply device for supplying the coarse powder separated by the classifier to the heating furnace,
The fine powder separated by the classifier is collected by the dust collector,
The apparatus for treating radioactive cesium-contaminated water according to claim 4 or 5, wherein the contaminated water containing the radioactive cesium is introduced into an exhaust gas of the classifier.   The apparatus for treating radioactive cesium-contaminated water according to claim 6, further comprising a washing device for washing the coarse powder with water, wherein the contaminated water containing the radioactive cesium is wastewater generated by the washing device.   The apparatus for treating radioactive cesium-contaminated water according to any one of claims 4 to 7, wherein the heating furnace is a rotary kiln.

Images