JP2013033019A - Method and apparatus for removing radioactive matter in radiation-contaminated water - Google Patents

Abstract

[PROBLEMS] To quickly remove a large amount of radioactively contaminated water at a low cost to remove radioactive substances in the contaminated water, or to remove radioactive substances attached to walls and floors without generating a large amount of contaminated water. Methods and apparatus are provided.
SOLUTION: A nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and a collection agent composed of Prussian blue and the radioactively contaminated water are mixed at a volume ratio of 1: 100 to 1: 10000. A step of forming a coaggregate of the scavenger and a radioactive substance in the presence of an electrolyte, and a coaggregate separation in which the coaggregate is separated to reduce the concentration of the radioactive substance in the radioactively contaminated water A method and an apparatus for removing radioactive substances in radioactively contaminated water, comprising: obtaining water.
[Selection] Figure 1

Description

  The present invention removes the above-mentioned substances in contaminated water contaminated by radioactive substances such as cesium 137, iodine 131, strontium 90 such as cesium, iodine or strontium, particularly radioactive radionuclides, particularly radioactive substances in radioactively contaminated seawater. The present invention relates to a method and an apparatus.

  As a means for purifying water contaminated by radioactive substances such as cesium, iodine or strontium, especially cesium 137, iodine 131 and strontium 90, for example, a technique using zeolite designed to incorporate particles of these artificial radionuclides ( Patent Document 1), and techniques using various filters such as ceramics, thin film filters, and reverse osmosis membranes have been proposed. In addition, Prussian blue and its similar compounds having higher binding power and selectivity to cesium than zeolite, and high molecular polysaccharide derivatives such as alginic acid exhibiting higher binding power and selectivity to strontium. It is also conceivable to use a hydrogel.

  However, the method using these zeolites and filters requires frequent replacement of clogged zeolites and filters deteriorated at high temperatures when treating a large amount of radioactively contaminated water, resulting in high costs. In addition, there is a problem that replacement work is not easy because a high concentration radioactive substance (particles) adheres to the filter to be replaced.

Special table 2007-526110 gazette

  The present invention can quickly process a large amount of radioactive contaminated water at a low cost to remove radioactive substances in the contaminated water, or remove radioactive substances attached to walls and floors without generating a large amount of contaminated water. It is an object of the present invention to provide a method and an apparatus.

  As a result of earnest research, the present inventor can co-aggregate with the collecting agent after collecting cesium in the contaminated water by using a collecting agent containing the nanocarbon dispersion and Prussian blue, We found that cesium adhering to walls and floors can be absorbed and removed. Furthermore, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon, respectively. The inventors have found that cesium and strontium can be adsorbed and held by a collecting agent composed of a dispersion, and have completed the following inventions.

(1) A method for removing radioactive substances in radioactively contaminated water, comprising a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, and the radioactively contaminated water, Are mixed at a volume ratio of 1: 100 to 1: 10000 to form a coaggregate of the scavenger and radioactive material in the presence of an electrolyte, and the coaggregate is separated to emit the radiation. And a step B of obtaining coaggregate-separated water in which the concentration of the radioactive substance in the radioactively contaminated water is reduced, and a method for removing the radioactive substance in the radioactively contaminated water.

(2) The radioactive substance contains at least cesium, and a urethane porous body containing a nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate, diatomaceous earth, and activated carbon. Removal of radioactive substances in the radioactively contaminated water according to (1), comprising the step C of obtaining the cesium-reduced water in which the coaggregate separation water obtained in the step B is circulated once or a plurality of times to reduce the cesium concentration Method.

(3) The collection agent has a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two types of cylinders filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. The method for removing a radioactive substance in radioactively contaminated water according to (1), which is a scavenger comprising at least one of diatomaceous earth and a nanocarbon dispersion.

(4) The radioactive material contains at least cesium, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nano-sized Prussian blue and alginic acid polymer filled in the inner space 2 Coagglomerate separation water obtained by the above-mentioned step B on the porous porous body containing at least one of cylindrical diatomaceous earths of the above and the above-mentioned scavenger comprising a nanocarbon dispersion and activated carbon comprising, for example, bamboo charcoal carbonized from bamboo. The method for removing radioactive substances in the radioactively contaminated water according to (3), comprising the step H of obtaining a cesium-reduced water in which the cesium concentration is reduced by circulating one or more times.

(5) The radioactive substance contains at least iodine, and the coaggregate separation water is passed through the urethane porous body containing nanocarbon dispersion dispersed by zwitterionic molecules and diatomaceous earth one or more times to obtain an iodine concentration. The removal method of the radioactive substance in the radioactive contamination water as described in (1) or (3) including the process D which obtains the iodine reduction water which reduced water.

(6) The radioactive substance contains at least iodine, and the iodine concentration is reduced by circulating the cesium-reduced water one or more times through a urethane porous body containing nanocarbon dispersion and diatomaceous earth dispersed by zwitterionic molecules. The method for removing radioactive substances in radioactively contaminated water according to (2) or (4), comprising the step E of obtaining reduced cesium / iodine reduced water.

(7) The radioactive material contains at least cesium, and a urethane porous body containing a nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue, diatomaceous earth, and activated carbon. The radioactive substance in the radioactively contaminated water according to (5), comprising the step F of obtaining iodine / cesium reduced water by further reducing the cesium concentration by circulating the iodine reduced water obtained by the step D one or more times Removal method.

(8) The radioactive material contains at least cesium, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nano-sized Prussian blue and alginic acid polymer filled in the inner space, respectively. The iodine-reduced water obtained by the step D is applied once to a urethane porous body containing a collecting agent composed of at least one kind of cylindrical diatomaceous earth and a nanocarbon dispersion and activated carbon composed of bamboo charcoal obtained by carbonizing bamboo, for example. Or the removal method of the radioactive substance in the radioactive contamination water as described in (5) including the process F which distribute | circulates several times and further reduces a cesium density | concentration and obtains iodine and cesium reduction water.

(9) A method for removing cesium adhering to an object, comprising a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, a porous porous material containing diatomaceous earth and activated carbon Rubbing the body against the object, and absorbing the cesium wet with water into the urethane porous body together with water, and leaving the cesium adsorbed on the composite multifunctional particles from the urethane porous body. And a method for removing radioactive substances, including a step of squeezing water.

(10) A method of removing cesium adhering to an object, the step of wetting the cesium with water, a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and a nano-space in the inner space A urethane porous body containing at least one of two types of cylindrical diatomaceous earth filled with Prussian blue and alginate polymer each having a size and a nanocarbon dispersion and activated carbon is rubbed against the object, A step of absorbing cesium wet with water into the urethane porous body together with water, and a step of squeezing water from the urethane porous body, leaving cesium adsorbed on the composite multifunctional particles. , How to remove radioactive material.

(11) The method for removing a radioactive substance according to (9) or (10), including a step of wetting cesium adhering to the object with water squeezed from the porous urethane body.

(12) A distribution body filled with a urethane porous body containing a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, diatomaceous earth and activated carbon in the inner space. Equipment for the removal of radioactive materials from radioactively contaminated water.

(13) At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, An apparatus for removing radioactive substances from radioactively contaminated water, comprising a collector filled with a nanocarbon dispersion and a porous body filled with a urethane porous body containing activated carbon.

(14) At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively The removal apparatus of the radioactive substance in the radioactive contamination water which has a distribution body provided with the collection agent which consists of a nano carbon dispersion.

(15) A solution containing a radioactive substance, a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate, and a collection agent composed of Prussian blue are mixed, and the collection agent is added in the presence of an electrolyte. Of radioactive material in radioactively contaminated water comprising means for forming a coaggregate of a radioactive substance and a separation means for separating the coaggregate and a solution having a reduced concentration of the radioactive substance apparatus.

(16) The apparatus for removing a radioactive substance from radioactively contaminated water according to (15), wherein the means for separating the coaggregate from the solution having a reduced concentration of the radioactive substance is a coaggregate filtration apparatus.

(17) A flow body filled with a urethane porous body containing a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, a diatomaceous earth and activated carbon (15) Or the removal apparatus of the radioactive substance in the radioactive contamination water as described in (16).

(18) At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, The removal apparatus of the radioactive substance in the radioactive contamination water as described in (15) or (16) which has a distribution body provided with the collection agent which consists of nanocarbon dispersion.

(19) At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively The radioactively contaminated water according to (15) or (16), comprising: a collector comprising a nanocarbon dispersion; and a distribution body filled with a urethane porous body containing activated carbon made of bamboo charcoal obtained by carbonizing bamboo, for example. Radioactive material removal equipment.

(20) Radioactivity in the radioactively contaminated water according to any one of (15) to (19), provided with a flow body filled with a nanocarbon dispersion dispersed with zwitterionic molecules and a urethane porous body containing diatomaceous earth. Substance removal device.

(21) The device according to any one of (15) to (20), further comprising means for adding an electrolyte to a solution containing a radioactive substance and / or a solution containing the radioactive substance and a mixture of the scavenger. Equipment for removing radioactive substances from radioactively contaminated water.

(22) A tank for containing a solution containing a radioactive substance, and a trapping agent comprising a nanocarbon dispersion and Prussian blue dispersed in the solution in the tank with zwitterionic molecules and lignin sulfonate, In the presence of an electrolyte, a collection agent addition device that is added at a volume ratio of 1: 100 to 1: 10000, and a filtration device that separates the coaggregates of the added collection agent and the radioactive substance are provided. The apparatus for removing a radioactive substance in radioactively contaminated water according to any one of (15) to (21).

(23) At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, It contains a scavenger consisting of nanocarbon dispersion and activated carbon, and has a rubbing member made of expandable / reducible urethane porous body, scraping cesium adhering to the object and getting wet with water, together with water An apparatus for removing radioactive substances that can absorb and squeeze out water.

(24) The radioactive substance removing apparatus according to (23), wherein the rubbing member is attached to the tip of the handle member in a mop shape.

(25) The radioactive substance removing apparatus according to (24), wherein the handle includes a discharge pipe that sucks and discharges water absorbed by the porous body.

  According to the present invention, cesium, strontium and iodine, in particular cesium and iodine in water contaminated with radioactive cesium and radioactive iodine, can be removed by about 90% or more as a coaggregate that can be easily separated, and further 98% or more can be removed. Furthermore, a total of about 95% or more of cesium in the contaminated water, or even 99.99% or more, can be removed by the cesium removal water pipe.

The block diagram which shows the apparatus which concerns on the Example of this invention The perspective view which shows the cesium removal water pipe for cesium removal In a cesium-removed water tube, a photomicrograph showing an enlarged urethane porous body formed by adding, mixing, and foaming diatomaceous earth filled with a precipitating agent in urethane prepolymer and activated carbon particles. The perspective view which shows the iodine removal water pipe for iodine ion removal Micrograph showing an enlarged urethane porous body formed by adding, mixing and foaming zwitterion particles / nanocarbon / diatomaceous earth to urethane prepolymer in an iodine removal water tube The flowchart which shows the process which removes a radioactive substance from radioactive contaminated water in the removal apparatus of the radioactive substance in the radioactive contaminated water which concerns on the Example of this invention. Schematic diagram showing an enlarged view of the state in which a scavenger is added to and mixed with radioactively contaminated seawater Schematic diagram showing how cesium particles and iodine particles are collected when the collection agent aggregates Schematic showing how the coaggregate of the scavenger and cesium caused self-precipitation Electron micrograph showing cylindrical diatomaceous earth used for composite multifunctional particles of the present invention Electron micrograph showing the same cylindrical diatomaceous earth Electron micrograph showing the state after the synthesis and filling of Prussian blue and alginic acid in cylindrical diatomaceous earth Similar electron micrograph Electron micrograph showing composite multifunctional particles formed by covering cylindrical diatomaceous earth filled with Prussian blue and alginic acid with a carbon nanotube network. Sectional view schematically showing the device 2) or device 3) of the present invention The perspective view which shows the urethane porous body which concerns on the Example of the removal apparatus of the cesium adhering to the wall or the floor Electron micrograph showing a decontamination sponge Similar electron micrograph The perspective view which shows the other Example of the removal apparatus of the cesium adhering to a wall or a floor Sectional drawing which shows typically the operation | work which removes radioactive pollutant with the removal apparatus

  The present invention relates to a method and an apparatus for removing radioactive substances in contaminated water, in particular cesium, using a scavenger composed of a nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue. . Another invention uses a urethane porous material containing a nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue, a diatomaceous earth, and activated carbon made of bamboo charcoal, for example, bamboo charcoal. The present invention relates to a method and an apparatus for adsorbing radioactive materials. Still another invention is a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. The present invention relates to a method and an apparatus for removing cesium and strontium in contaminated water using a collecting agent comprising a nanocarbon dispersion. Furthermore, another invention relates to a method and apparatus for removing radioactive cesium, radioactive iodine, radioactive strontium, and the like attached to walls and floors.

<Collector 1>
One embodiment of the collecting agent in the present invention is the collecting agent 1 composed of a nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue.

  The nanocarbon dispersion contained in the scavenger 1 in the present invention means that the nanocarbon aggregate is isolated by using a zwitterionic molecule having both positive and negative charges in one molecule and lignin sulfonate as a dispersant. Distributed processing.

  Examples of the nanocarbon usable in the present invention include carbon nanotube (CNT), fullerene, graphene, graphene oxide, carbon black, activated carbon, or a mixture thereof.

  The zwitterionic molecule for dispersing the nanocarbon is not particularly limited as long as the nanocarbon can be dispersed in a single molecule state. For example, 3- (N, N′-dimethylstearylammonio) ) Propanesulfonate, 3- (N, N′-dimethylmyristylammonio) propanesulfonate, 3-[(3-cholamidopropyl) dimethylammonio] -1-propanesulfonate, 3-[(3-cholamidopropyl) Dimethylammonio] -2-hydroxypropanesulfonate, n-dodecyl-N, N′-dimethyl-3-ammonio-1-propanesulfonate, n-hexadecyl-N, N′-dimethyl-3-ammonio-1-propanesulfonate N-octylphosphocholine, n-dodecylphosphocholine, n- Low molecular weight zwitterionic surfactants such as tradecylphosphocholine, n-hexadecylphosphocholine, dimethylalkylbetaine, perfluoroalkylbetaine, or 2-methacrylyloxyphosphorylcoin (NPC) and n-butymethacrylate (BMA) A high-molecular-weight zwitterionic substance that is composed of a copolymer of Dispersion of nanocarbons, particularly carbon nanotubes, with zwitterionic molecules can also be performed with reference to the technology disclosed in, for example, International Publication No. WO2005 / 110594.

  In addition, lignin sulfonate is a compound in which a part of a lignin degradation product is sulfonated (also referred to as lignosulfonic acid, CAS registration number 8062-15-15), which is produced from lignin in wood in the pulp manufacturing process by the sulfurous acid method. 5). Since lignin sulfonate becomes an anionic surfactant, it can be used as a dispersant for carbon nanotubes, for example, by the method disclosed in JP-A-2005-263608.

  The nanocarbon dispersion in the present invention is, for example, dispersed with nanocarbon in an amount ratio of 0.001 to 0.01 wt% of zwitterionic substance and 0.001 to 0.01 g of lignin sulfonate with respect to 1 g of nanocarbon. In addition to water as a medium, it can be prepared by mixing using a magnetic stirrer, ultrasonic treatment, attritor, ball mill, sand mill, bead mill or the like. The dispersion medium may contain components other than water, for example, hydrophilic solvents such as methanol, ethanol, ethylene glycol, propylene glycol, and glycerin.

Prussian blue used in the present invention is a cyano complex which is also called iron hexacyanoferrate (II), iron chloride (III), ferric ferrocyanide (III) or ferric ferrocyanide (II). Prussian blue has a binding constant several hundred million times higher than cesium ions than sodium ions and magnesium ions, and can form a complex with cesium ions. The Prussian blue that can be used in the present invention is not limited to a cyano complex having a specific coordination state or coordination number of the complex as long as it has such properties.

  The collection agent 1 in the present invention has a nanocarbon dispersion concentration of 0.001 to 10 wt% and a Prussian blue concentration of 1.0 mM to 0.5 M, and 1 part by weight of nanocarbon before dispersion. Can be prepared by mixing Prussian blue in a ratio of 0.1 to 100 parts by weight in a suitable medium, preferably in water. Mixing does not require special conditions. For example, when the total amount of the mixture is 10 liters, it may be appropriately adjusted at 15 to 45 ° C. for 3 to 10 minutes. The scavenger 1 thus prepared can also be expressed as a colloidal solution of Prussian blue and nanocarbon.

<Collector 2>
Another aspect of the collecting agent in the present invention is a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or nano-sized Prussian blue and alginic acid polymer filled in the inner space, respectively. It is the collection agent 2 which consists of a cylindrical diatomaceous earth of a seed | species, and a nanocarbon dispersion.

  A mixture of cylindrical diatomaceous earth simultaneously filled with Prussian blue and alginic acid and the above two types of cylindrical diatomaceous earth may be mixed with the nanocarbon dispersion, and most of them are simultaneously filled with Prussian blue and alginic acid. The nanocarbon dispersion may be mixed as cylindrical diatomaceous earth filled with Prussian blue inside or cylindrical diatomaceous earth filled with alginic acid inside.

  The collecting agent 2 is, for example, cylindrical diatomaceous earth (see FIGS. 12 and 13) in which nano-sized Prussian blue and alginic acid are simultaneously filled in the inner space as shown in FIGS. 10 and 11, and / or Prussian blue and alginic acid. It is formed by mixing two types of cylindrical diatomaceous earths filled separately with a nanocarbon dispersion (see FIG. 14).

Specifically, for example, after adding FeCl ₃ solution to cylindrical diatomaceous earth commercially available from Eagle-Picher Filtration & Minerals, Inc., USA and mixing and drying, Na ₄ Fe (CN) ₆ solution is added. By mixing and drying, a cylindrical diatomaceous earth filled with Prussian blue can be produced. Also, a cylindrical diatomaceous earth filled with alginic acid or Prussian blue and alginic acid is produced by adding an alginate solution to the cylindrical diatomaceous earth or cylindrical diatomaceous earth filled with Prussian blue and mixing and drying. Can do. The trapping agent 2 can be prepared by mixing and drying the cylindrical diatomaceous earth filled with Prussian blue and / or alginic acid in the inside thus obtained and the nanocarbon dispersion.

The mixture of cylindrical diatomaceous earth and Prussian blue is 1.0 mM to 0 for Prussian blue (as formed by the reaction of FeCl ₃ and Na ₄ Fe (CN) ₆ ) with respect to 50 g to 500 g of cylindrical diatomaceous earth. Adjust by adding 5 mL of 100 mL solution. Moreover, what is necessary is just to adjust the nanocarbon dispersion added with respect to the cylindrical diatomaceous earth 50g-500g in said range in the range of 0.01-10 weight% CNT dispersion | distribution 1mL-100mL.

  Although the configuration of the collection agent 2 is not definitively limited, the end opening (including the case where only one end is open) of the cylindrical diatomaceous earth is covered with the nanocarbon dispersion, and the Prussian inside the cylinder While the blue / alginate polymer outflow is suppressed and the filled state is maintained, the outer periphery of the cylindrical diatomaceous earth has many nano-sized micropores, and the gap between the tubes in the lid by the nanocarbon dispersion It is assumed that the micropores on the outer periphery of the cylindrical diatomaceous earth are channels through which water and radioactive substances pass through the cylinder.

<Formation of coaggregates>
A solution containing an electrolyte and cesium or a solution containing cesium, strontium, iodine and an electrolyte is typically radioactively contaminated seawater after being used for cooling of radioactive materials. In the present invention, a coaggregate may be formed in the presence of an electrolyte. However, such an electrolyte may be an electrolyte previously contained in a solution containing a radioactive substance, or may be a solution containing a radioactive substance or a radioactive substance. The electrolyte may be separately added to a solution in which a solution containing a substance and the collection agent 1 and / or the collection agent 2 are mixed. For example, when a solution containing no pure water or other salt is used for cooling the radioactive substance, an appropriate amount of electrolyte, such as sodium chloride or boric acid, is added to the radioactively contaminated water to be recovered. It can be set as the solution used as the object of the present invention. In the present invention, the electrolyte concentration of the solution can be used in a range higher than the salt concentration in natural seawater, for example, even if the weight% of the solution> 3%. The present invention may include a step of adjusting the salt concentration in the solution by adding an electrolyte or adding water not containing an electrolyte.

  The scavenger 1 used in the present invention is mixed with a solution containing a radioactive substance such as cesium in a suitable container (such as a tank or a tank) at a volume ratio of 1: 100 to 1: 10000. Cesium can be captured to form a frog-like coaggregate. The mixing does not require special conditions or means, but may be appropriately adjusted and mixed within a range of about 15 ° C. to 100 ° C. and 5 minutes to 1 hour. Moreover, you may stir as needed.

  The present invention is effective for removing cesium and iodine, but other plutonium and strontium can also be removed.

  Separation of coaggregates of collection agent 1 and / or collection agent 2 and cesium is performed by separation by sedimentation precipitation filtration, as well as separation of aggregates such as flotation by bubbles, adsorption, centrifugation, or combinations thereof from the solution. It can be done by the method of In order to reduce the volume and type of radioactive pollutants that are finally discarded, separation by sedimentation precipitation filtration and disposal of coaggregates are preferred.

  The discarded coaggregates are less likely to reach a higher temperature than when these particles are in close contact with each other because the nanocarbon is interposed between the particles of the radioactive substance.

  The solution obtained by separating the coaggregate is recovered as a solution having a reduced cesium concentration from the state before the coaggregation formation. The term “removing a substance” as used in the present invention means not only the case where the substance concentration in the solution after the separation is below the detection limit and the substance is substantially removed, but also a part of the radioactive substance is removed and coaggregation This includes the case where the substance concentration in the solution before and after separation of the substance or before and after passing through the collection agent 1 and / or 2 is lowered.

  Moreover, the collection agent in this invention, especially the collection agent 2 can be utilized as a packing material in a cylindrical member whose both ends are fixed using a filter that does not allow micron-size collection agent to flow out. The member filled with the trapping agent, that is, the distribution pipe, allows the radioactive substance concentration (seawater) to circulate therethrough, thereby reducing the concentration of radioactive substance in the contaminated water or removing the radioactive substance. Is.

<Cesium removal urethane porous body 1>
Furthermore, in the present invention, a carbon porous material dispersed with a zwitterionic molecule and a lignin sulfonate and a trapping agent composed of Prussian blue, a diatomaceous earth, and a urethane porous material containing activated carbon composed of bamboo charcoal carbonized, for example, bamboo is used. Then, it may include a step of further reducing the concentration of cesium in the solution by adsorbing cesium remaining in the solution after separating the coaggregates.

The urethane porous material is prepared by mixing a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, a diatomaceous earth, activated carbon, and a urethane monopolymer, and then mixing polyurethane. It can produce by making it foam. For example, activated carbon or diatomaceous earth is impregnated with an iron (II) ferrocyanide aqueous solution, Fe (III) is further added, and Prussian blue: {FeIII (4) [FeIICN (6)] ₃ } particles having activated carbon or diatomaceous earth as a skeleton Can be prepared and added to the urethane prepolymer and mixed / foamed.

  The diatomaceous earth and activated carbon are preferably pulverized in advance before mixing with the urethane monopolymer. Moreover, it is preferable to mix diatomaceous earth, bamboo charcoal, and the collection agent of this invention, and a urethane monopolymer by 5 to 50% by weight ratio.

  The activated carbon derived from bamboo charcoal is particularly excellent, but other activated carbon may be used.

<Cesium removal urethane porous body 2>
Further, in the present invention, the collector 2, ie, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or two kinds of nano-sized Prussian blue and alginic acid polymer filled in the inner space, respectively. The concentration of cesium and strontium in the solution is obtained by adsorbing cesium and strontium using a urethane porous body containing a collecting agent composed of cylindrical diatomaceous earth and a nanocarbon dispersion and activated carbon composed of bamboo charcoal obtained by carbonizing bamboo, for example. May be further reduced.

  The urethane porous body can be prepared by mixing the collection agent 2, activated carbon and urethane monopolymer, and then foaming polyurethane by a known method.

  Bamboo charcoal and the collector 2 of the present invention and the urethane monopolymer are preferably mixed at a weight ratio of 5 to 50%.

  The activated carbon derived from bamboo charcoal is particularly excellent, but other activated carbon may be used.

<Iodine removal and urethane porous body>
The present invention may include a step of reducing the iodine concentration in a solution in which it is difficult to reduce the concentration only by using the scavenger in the present invention, before or after or in parallel with the step of reducing the cesium concentration. This step can be performed by circulating a solution containing iodine through a urethane porous body containing nanocarbon dispersion and diatomaceous earth dispersed by zwitterionic molecules. This process can be performed for any solution before or after reducing the cesium concentration by coaggregation.

  The urethane porous body for reducing the iodine concentration can be produced by mixing zwitterionic particles, dispersed nanocarbon, diatomaceous earth and urethane monopolymer, and then foaming polyurethane by a known method. Specifically, a zwitterion exchange particle having nanocarbon and diatomaceous earth as a protective layer is created by ionic bonding between a polymer having a quaternary ammonium base in diatomaceous earth and a polymer having a sulfonic acid-sensitive group, Next, amphoteric ion exchange particles were added to the urethane prepolymer, mixed / foamed, and a porous polyurethane was prepared. The urethane porous body thus obtained has a zwitterionic substance that has a binding constant several thousand times that of chloride ions and sulfate ions with respect to iodine and selectively binds with iodine to form a pseudo ion pair. . It also has a high binding constant for strontium.

  The nanocarbon dispersion used here is as described above. The diatomaceous earth, the monocarbon dispersion dispersed with zwitterionic molecules, and the urethane monopolymer are preferably mixed at a weight ratio of 0.5 to 50%.

  It is preferable that all of the three types of polyurethane porous bodies are used by being filled in a suitable container through which a liquid such as a tube, tube, or ridge having an appropriate diameter can flow.

<Device>
The present invention further provides an apparatus for carrying out the method described so far, specifically a solution containing an electrolyte and a radioactive substance, for example, radioactive cesium, or a solution containing radioactive cesium, radioactive iodine and an electrolyte, and a zwitterion Means 1) for mixing a nanocarbon dispersion dispersed with molecules and lignin sulfonate and a collection agent consisting of Prussian blue to form a co-aggregate of the collection agent and radioactive cesium, And a device 1) for removing radioactive substances in radioactively contaminated water, comprising means 2) for separating the coaggregates and solutions with reduced radioactive cesium concentration.

  Moreover, the radioactive substance removal apparatus provided with the distribution body filled with the urethane porous body containing the collection agent which consists of a nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate, diatomaceous earth and activated carbon 2).

  In addition, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or two types of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon dispersion Provided is a radioactive substance removing device 3) provided with a flow body filled with a collecting agent composed of a substance.

  Furthermore, it is possible to expand and contract urethane porous material containing nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue, diatomaceous earth and activated carbon, or nano-sized in the inner space. A cylindrical diatomaceous earth filled with Prussian blue and alginic acid polymer and / or two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and a nanocarbon dispersion In addition, it has a rubbing member made of a porous urethane body that can be expanded and contracted, including activated carbon, scraping off cesium adhering to the object and getting wet with water, absorbing it with water, and squeezing out water Provided is a radioactive substance removing device 4).

<Apparatus 1>
Means 1) typically include a stirrer and a tank or tank equipped with a plurality of pipes through which liquid flows, and means 2) typically includes a filtration device that separates co-aggregates by filtration. be able to. Specific examples of the apparatus of the present invention having such means and elements suitably included in the apparatus are shown in FIGS. 1 to 5 along with the treatment of seawater contaminated with radioactivity.

  1 to 5, a radioactive substance removal device (hereinafter, referred to as a processing device) 10 in radioactively contaminated water includes a tank 14 for storing seawater 12 and the seawater 12 in the tank 14 in the present invention. A trapping agent addition device 16, a sedimentation tank 18 that receives the seawater 12 to which the trapping agent has been added from the tank 14, a filtration device 20 that separates sediment from the seawater in the sedimentation tank 18, and a filtration device 20 A cesium removal water pipe 22 for removing radioactive cesium from the seawater that has passed through and an iodine removal water pipe 24 for removing radioactive iodine from the seawater that has passed through the cesium removal water pipe 22 are configured.

  In FIG. 1, reference numeral 26 is a first pump for pumping seawater that has passed through the filtering device 20 to the cesium removal water pipe 22, and 28 is a second pump for pumping seawater that has passed through the cesium removal water pipe 22 to the iodine removal water pipe 24. Each pump is shown. A two-dot chain line indicates a salt content adding device 30 for adjusting the electrolyte concentration of seawater.

  The collection agent addition device 16 is operated while adjusting the addition amount so that the collection agent is added at a ratio of 1 to 100 to 10,000 seawater in the tank 14 in a volume ratio.

  The sedimentation tank 18 coaggregates the radioactive cesium in the seawater and the scavenger to cause precipitation.

  The filtration device 20 is composed of a filter provided at the suction side end of the first pump 26 in the sedimentation tank 18, and removes the sediment from the seawater when the seawater 12 is sucked up by the first pump 26. .

  As shown in FIG. 2, the cesium-removed water pipe 22 contains a collection agent 1 or a collection agent 2 composed of a nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate, diatomaceous earth, and bamboo charcoal. The urethane porous body 22B containing is provided in the pipe 22A.

  The iodine removal water pipe 24 includes a urethane porous body 24B containing a nanocarbon dispersion and diatomaceous earth dispersed by zwitterionic molecules in the pipe 24A. The iodine removal water pipe 24 can also be an iodine / strontium removal water pipe that also removes strontium.

  Next, a process of removing radioactive substances from radioactively contaminated seawater by the processing apparatus 10 will be described with reference to FIG.

  The collection agent prepared in step 101 is added by the addition device 16 to the radioactively contaminated seawater in the tank 14 in step 102. Next, the seawater to which the scavenger is added is transferred to the settling tank 18 in step 103. In the sedimentation tank 18, the nanocarbon dispersion 31 serving as a scavenger shown in FIG. 7 loses stability in seawater containing a high concentration electrolyte, and as shown in FIG. 8, radioactive substances, particularly cesium 137 Particles and iodine particles (both indicated by reference numeral 32) are captured and co-aggregated therewith, resulting in precipitation as shown in FIG. Moreover, in order to accelerate | stimulate precipitation, you may add a general aggregation promoter, for example, aluminum sulfate, polyaluminum chloride, etc.

  In step 104, when the seawater in the sedimentation tank 18 is sucked up through the filtration device 20 by the first pump 26 and sent to the cesium removal water pipe 22, the sediment in the sedimentation tank 18 is filtered by the filtration device 20. Only the seawater not containing water is pumped to the cesium removal water pipe 22 (see step 105).

  In the next step 106, the seawater pumped by the first pump 26 is sent to the cesium removal water pipe 22, and cesium particles in the seawater are selectively removed when passing through the cesium removal water pipe 22.

  In step 107, the seawater from which the cesium particles have been removed is pumped to the iodine removal water pipe 24 by the second pump 28. In the iodine removal water pipe 24, iodine ion recognition substance selectively binds with iodine to form a pseudo ion pair, whereby iodine is selectively removed into the iodine removal water pipe 24 (step 108). reference).

  In the next step 109, the seawater from which iodine has been selectively removed is discharged into the sea if the amount of residual radioactive material is examined and if it is below a certain value.

  The tank 14, the addition device 16, and the settling tank 18 may be a single processing means. In this case, a tank equipped with a collecting agent addition device may also serve as a settling tank.

<Device 2) and Device 3)>
The radioactive substance removing device 40 according to the device 2) shown in FIG. 15 is dispersed by a tube 42 and zwitterionic molecules and lignin sulfonate held between the upper and lower filters 44A and 44B in the tube 42. It is comprised by the distribution | circulation pipe | tube consisting of the urethane porous body containing the collection agent which consists of the made nano carbon dispersion and Prussian blue, diatomaceous earth, and activated carbon. The apparatus 3) is constituted by a flow pipe holding composite multifunctional particles 46 between the filters 44A and 44B.

  This radioactive substance removing device 40 may be used alone or in place of the cesium removing water pipe 22 in the device 1).

<Apparatus 4>
The radioactive substance removing device 50 shown in FIG. 16 has a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space and / or 2 filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. Sponge specially for decontamination of expandable / shrinkable urethane porous material including activated carbon containing a trapping agent consisting of a cylindrical diatomaceous earth and a nanocarbon dispersion and activated carbon And is made of a rectangular sponge-like rubbing member used for cleaning or the like.

  The rubbing member contains composite multifunctional particles, is made of a porous urethane that can expand and contract, and adheres to objects such as walls and floors, and scrapes away cesium wetted by sprayed or sprayed water. Can be absorbed with water. In this case, the operator holds the rubbing member in a hand with waterproof and antifouling gloves and scrapes off the cesium adhering to the object.

  If this rubbing member is pressed, the absorbed water can be squeezed out. At this time, cesium is collected by the urethane porous body in the same manner as in the case of the cesium-removed water pipe 22, so that the squeezed water hardly contains cesium.

  Therefore, cesium adhering to the wall or floor can be easily scraped and adsorbed. Moreover, since the squeezed waste water contains almost no cesium, so-called radioactive contamination water does not increase.

  17 and 18 show electron micrographs of this decontamination sponge. It can be seen that composite multifunctional particles that adsorb radioactive substances are moderately fixed and held on the sponge and function as an adsorption field.

  Since such a radioactive substance removing device 50 is sponge-like and easy to handle, it is possible to decontaminate buildings and buildings by distributing it to local governments and companies such as evacuation areas. It can proceed efficiently.

  A radioactive substance removing device 60 shown in FIG. 19 includes a rubbing member 62 similar to that described above, and a handle member 64 having the rubbing member 62 attached to the tip in a mop shape.

  In the radioactive substance removing device 60, the handle member 64 is made hollow, and a negative pressure is applied to the upper surface of the rubbing member 62 by the suction pump 66A provided outside as shown in FIG. The adsorbed water can be continuously discharged to the tank 68 through the handle member 64.

  Therefore, the radioactive substance removal operation can be performed quickly.

  Here, the tank 68 is provided with a pumping pump 66B for pumping the water in the tank 68, sent to the nozzle 70, wets the cesium adhering to the wall 72 and the floor 74, and is rubbed by the rubbing member 62. Easy to take.

  In this case, since the water after passing through the rubbing member 62 and adsorbing cesium can be used repeatedly, the amount of water used for the radioactive substance removing operation can be reduced.

  The radioactive substance removing device may be composed of the rubbing member 62 and the handle member 64 without using the pumps 66A and 66B and the tank 68.

  Further, the rubbing member 62 has a rectangular parallelepiped shape in the figure, but this may be a cube or may have various configurations such as a disk shape or an ellipsoidal shape. In addition to the polyurethane porous body, any rubbing member may be used as long as it can hold the scavenger powder in the present invention in a sponge-like shape such as nylon sponge, natural sponge, polyvinyl alcohol sponge, etc. Is possible.

  Furthermore, the water that wets the cesium may contain not only fresh water but also salts such as seawater.

<Example 1>
Method using CNT-containing collector 1) Preparation of CNT collector In 1 liter of distilled water, 2 g of 3- (N, N′-dimethylmyristylammonio) propane sulfonate and 10 g of sodium lignin sulfonate were added. After addition and stirring, 50 g of CNT powder was added and stirred for another 20 minutes. Using a bead mill, dispersion treatment was performed for 60 minutes to obtain a nanocarbon dispersion.

2) Preparation of Prussian blue / nanocarbon composite scavenger Add hexacyano iron (II) and iron (III) chloride to the above nano carbon dispersion, concentration 10
A Prussian blue / nanocarbon composite scavenger (colloid) containing 0 mM Prussian blue was prepared.

3) Preparation of Prussian blue / nanocarbon / diatomaceous earth composite scavenger Add to 100 ml of Prussian blue / nanocarbon composite colloid prepared in 2) above, add 100 g of dry silicon earth powder, freeze-dry, Prussian blue / nanocarbon / A diatomite composite scavenger “powder” was prepared.

4) Removal of cesium Add the trapping agent prepared in 2) or 3) of 1/1000 in volume ratio to 2 liters of artificial seawater (salt concentration of about 3 wt%) containing 2.0 ppm of cesium ions. The coaggregate was precipitated in the precipitation tank 18 that was continuously stirred at 25 ° C. for 10 minutes. The cesium concentration in the seawater after the precipitate was filtered by the filtration device 20 was below the detection limit.

5) Preparation of cesium-removed water tube 50 g of composite type collector prepared using nanocarbon dispersion, Prussian blue and diatomaceous earth dispersed with zwitterionic molecules and lignin sulfonate, 10 g of bamboo charcoal-derived activated carbon, toluene di 100 g of isocyanate, 80 g of polyol, mixed with 5 mL each of foaming agent, catalyst, and foam stabilizer, foamed in a plastic tube, and prepared a cesium-removed water tube 22. When artificial seawater (salt concentration of about 3 wt%) having a volume of 20 liters containing 100 ppb of cesium ions passed through the filtering device 20 was passed through the cesium-removed water pipe 22, about 99.99% of the cesium in the artificial seawater was finally obtained. Removed.

6) Preparation of iodine and strontium removed water pipe In the examples, an iodine / strontium removed water pipe that selectively removes strontium in addition to iodine was prepared.

  Nittobo Co., Ltd. Dunshade-185 (trade name); diallyldimethylammonium chloride / N- (3-chloro-2-hydroxypropyl) diallylamine copolymer as a polymer cationic polymer, polymer anion Alginate polymer was added to the colloid containing 5 wt% nanocarbon and 2 wt% diatomaceous earth at a ratio of 1M: 1M as a conductive polymer, and after stirring and freeze-drying, 100 g of powder was obtained. 50 g of this powder, 10 g of bamboo charcoal-derived activated carbon, 100 g of toluene diisocyanate, 80 g of polyol, foaming agent, catalyst, and 5 mL of foam stabilizer were mixed and foamed in a plastic tube to prepare an iodine removal water tube 24. The artificial seawater (salt concentration of about 3 wt%) containing iodide ions of 100 ppb and strontium ions of 200 ppb passed through the filtration device 20 was passed through the iodine ion / strontium ion removal water pipe 24. Finally, in the artificial seawater 99.7% of the iodine ions were removed and 98.6% of the strontium ions were removed.

<Example 2>
1) Preparation of cylindrical diatomaceous earth filled with Prussian blue Tubular diatomaceous earth (purchased from Eagle-Picher Filtration & Minerals, Inc., USA, FIG. 10, FIG. 11) 100 mL of 960 mM FeCl ₃ solution was added to 25 g. After mixing at 30 ° C. for 30 minutes, ventilation drying was performed at 80 ° C. After adding 300 mL of 720 mM Na ₄ Fe (CN) ₆ solution to 250 g of the dried powder, mixing at 25 ° C. for 5 minutes, and then air-drying at 80 ° C. to form cylindrical diatomaceous earth A filled with Prussian blue inside (FIGS. 12 and 13).

  250 mL of the CNT dispersion prepared in 1) of Example 1 was added to 100 g of this cylindrical diatomaceous earth A, and the mixture was further mixed for 5 minutes, and then air-dried at 80 ° C. to collect the CNT dispersion adhered to the cylindrical diatomaceous earth A. An agent was obtained (FIG. 14).

  100 g of the above-mentioned scavenger, 10 g of bamboo charcoal-derived activated carbon powder, 200 g of toluene diisocyanate, 100 g of polyol, 5 mL of foaming agent, catalyst and foaming agent were mixed and foamed in a plastic tube to produce a sponge body. The scavenger is incorporated in a part of the gap of the sponge body.

2) Preparation of cesium / strontium adsorbing scavenger Add 100mL of 3wt% sodium alginate aqueous solution to 100g of cylindrical diatomaceous earth (purchased from Eagle-Picher Filtration & Minerals, Inc., USA), and mix at 25 ° C for 30 minutes And ventilation drying at 80 ° C. To 100 g of the dried powder, 1000 mL of a 10 wt% calcium chloride aqueous solution was slowly added, mixed at 25 ° C. for 60 minutes, and then air-dried at 80 ° C. to obtain cylindrical diatomaceous earth B filled with alginic acid.

  After mixing 100 g each of the cylindrical diatomaceous earth A prepared in 1) and the above cylindrical diatomaceous earth B, 500 mL of the CNT dispersion prepared in 1) of Example 1 was added, and after further mixing for 5 minutes, ventilation drying was performed at 80 ° C. Thus, a scavenger (powder) for cesium / strontium adsorption was obtained.

3) Preparation of sponge body supporting cesium / strontium adsorption collector 100 g of cesium / strontium adsorption collector prepared in 2), bamboo charcoal-derived activated carbon 10 g, toluene diisocyanate 200 g, polyol 100 g, blowing agent, catalyst Each foaming agent (5 mL) was mixed and foamed in a plastic tube to prepare a sponge body. The cesium / strontium adsorption trapping agent is incorporated in a part of the gap of the sponge body.

  The radioactive substance removing device 50 scrapes and absorbs the cesium adhering to the floor, and squeezes this to discharge the water. As a result, 99.99% of the cesium in the discharged water is removed. Met. Although the cesium removal rate varies depending on the ratio of cesium amount / adsorbent, 1 gram of urethane porous material containing 1.5 wt% Prussian blue adsorbs 2.87 mg of cesium with good reproducibility. As confirmed by the results, if the amount of Prussian blue added is increased, it is expected that a removal rate exceeding 99.99% can be obtained. Moreover, although it changed with conditions and a measuring apparatus, it was confirmed that at least 95% could be removed. Due to the presence of the alginic acid polymer, strontium was also adsorbed, and a removal rate of 95% or more could be confirmed.

  Further, even when the cesium removal water tube was constituted by the cesium removal urethane porous body 1) instead of the cesium removal urethane porous body 2), the same removal effect was confirmed for cesium. In addition, about the urethane porous body 1) for cesium removal, when not using nanocarbon, it was confirmed that a cesium removal rate falls about 10%.

DESCRIPTION OF SYMBOLS 10, 40, 50, 60 ... Radioactive substance removal apparatus 12 ... Seawater 14 ... Tank 16 ... Addition apparatus 18 ... Precipitation tank 20 ... Filtration apparatus 22 ... Cesium removal water pipe 22A ... Pipe 22B ... Urethane porous body 24 ... Iodine removal water pipe 24A ... pipe 24B ... urethane porous body 26 ... first pump 28 ... second pump 30 ... salt addition device 31 ... nanocarbon dispersion 32 ... radioactive particles 44A, 44B ... filter 46 ... composite multifunctional particles 62 ... rubbing member 64 ... handle member 66A, 66B ... pump 68 ... tank 70 ... nozzle 72 ... wall 74 ... floor

Claims (25)

  A method for removing radioactive substances from radioactively contaminated water, comprising a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue collector and the radioactively contaminated water in a volume ratio. Mixing at 1: 100 to 1: 10000 to form a coaggregate of the scavenger and the radioactive substance in the presence of an electrolyte, and separating the coaggregate into the radioactively contaminated water And a step B of obtaining coaggregate-separated water in which the concentration of the radioactive substance is reduced, and a method for removing the radioactive substance in the radioactively contaminated water. In claim 1,
The radioactive substance contains at least cesium, a urethane porous material containing a nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate, diatomaceous earth, and activated carbon. A method for removing radioactive substances from radioactively contaminated water, comprising a step C of obtaining the cesium-reduced water in which the obtained coaggregate separation water is circulated once or a plurality of times to reduce the cesium concentration. In claim 1,
The scavenger is a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. A method for removing a radioactive substance in radioactively contaminated water, which is a scavenger comprising at least one and a nanocarbon dispersion. In claim 3,
The radioactive substance contains at least cesium, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of tubes filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. The cesium concentration is obtained by circulating the coaggregated water obtained in the step B one or more times through the urethane porous body containing the collector and activated carbon composed of at least one of the diatomaceous earth and the nanocarbon dispersion. A method for removing radioactive substances in radioactively contaminated water, comprising the step H of obtaining cesium-reduced water with reduced water content. In claim 1 or 3,
The radioactive substance contains at least iodine, and the coaggregate separation water is circulated once or a plurality of times through a urethane porous body containing nanocarbon dispersion dispersed by zwitterionic molecules and diatomaceous earth to reduce iodine concentration. A method for removing radioactive substances in radioactively contaminated water, comprising the step D of obtaining iodine-reduced water. In claim 2 or 4,
The radioactive substance contains at least iodine, and the cesium-reduced water is circulated once or a plurality of times through a urethane porous body containing a nanocarbon dispersion dispersed by zwitterionic molecules and diatomaceous earth to reduce the iodine concentration. -The removal method of the radioactive substance in radioactive contamination water including the process E which obtains iodine reduction water. In claim 5,
The radioactive substance contains at least cesium, and a urethane porous body containing a nanocarbon dispersion dispersed by zwitterionic molecules and lignin sulfonate and Prussian blue, diatomaceous earth, and activated carbon is converted into a urethane porous body by the step D. A method for removing radioactive substances from radioactively contaminated water, comprising the step F of obtaining iodine / cesium reduced water by further reducing the cesium concentration by circulating the obtained iodine reduced water one or more times. In claim 5,
The radioactive substance contains at least cesium, cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of tubes filled with nano-sized Prussian blue and alginic acid polymer in the inner space, respectively. The cesium concentration is further reduced by circulating the iodine-reduced water obtained in the step D one or more times through a urethane porous body containing at least one of a diatomaceous earth and a nanocarbon dispersion and activated carbon. A method for removing radioactive substances from radioactively contaminated water, comprising the step F of obtaining iodine / cesium-reduced water.   A method of removing cesium adhering to an object, comprising a urethane porous body comprising a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, a diatomaceous earth, and activated carbon. Rubbing against the object and absorbing the cesium wet with water into the urethane porous body together with water, and leaving the cesium adsorbed on the composite multifunctional particles from the urethane porous body, And a method for removing radioactive material, including a step of squeezing out the material.   A method of removing cesium adhering to an object, the step of wetting the cesium with water, a cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and a nano-sized Prussian in the inner space A urethane porous body containing at least one of two types of cylindrical diatomaceous earth filled with blue and alginic acid polymers, a collection agent composed of a nanocarbon dispersion, and activated carbon, is rubbed against the object and wetted with the water. A radioactive substance comprising: a step of absorbing cesium together with water into the urethane porous body; and a step of squeezing water from the urethane porous body, leaving cesium adsorbed on the composite multifunctional particles. Removal method. In claim 9 or 10,
A method for removing a radioactive substance, comprising a step of wetting cesium attached to the object with water squeezed from the urethane porous body.   Radioactivity with a flow medium filled with a urethane porous material containing a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate and Prussian blue, diatomaceous earth and activated carbon in the inner space Equipment for removing radioactive substances from contaminated water.   At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon An apparatus for removing radioactive substances from radioactively contaminated water, comprising a collector filled with a porous material containing a collection agent and activated carbon containing a dispersion.   At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon The removal apparatus of the radioactive substance in the radioactive contamination water which has a distribution body provided with the collection agent which consists of a dispersion.   Mixing a solution containing a radioactive substance, a nanocarbon dispersion dispersed with zwitterionic molecules and lignin sulfonate, and a Prussian blue collector, and in the presence of an electrolyte, the collector and the radioactive substance And a device for removing a radioactive substance in radioactively contaminated water, comprising: a means for forming a coaggregate with the same; and a separation means for separating the coaggregate from a solution having a reduced concentration of radioactive substance. In claim 15,
An apparatus for removing radioactive substances from radioactively contaminated water, wherein the means for separating the coaggregates from the solution having a reduced concentration of radioactive substances is a coaggregate filtration apparatus. In claim 15 or 16,
Radioactivity in radioactive polluted water with a flow medium filled with a urethane porous material containing nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate, diatomaceous earth and activated carbon Substance removal device. In claim 15 or 16,
At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon The removal apparatus of the radioactive substance in the radioactive contamination water which has a distribution body provided with the collection agent which consists of a dispersion. In claim 15 or 16,
At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon An apparatus for removing radioactive substances from radioactively contaminated water, comprising a collector filled with a porous material containing a collection agent and activated carbon containing a dispersion. In any of claims 15 to 19,
An apparatus for removing radioactive substances from radioactively contaminated water, provided with a flow body filled with a nanocarbon dispersion dispersed with zwitterionic molecules and a urethane porous body containing diatomaceous earth. In any one of claims 15 to 20,
An apparatus for removing a radioactive substance in radioactively contaminated water, comprising means for adding an electrolyte to a solution containing a radioactive substance and / or a solution containing the radioactive substance and a collection agent. Any one of claims 15 to 21
A tank for containing a solution containing a radioactive substance, and a collector composed of nanocarbon dispersion and Prussian blue dispersed with zwitterionic molecules and lignin sulfonate in the solution in the tank, and presence of electrolyte A collector addition device for adding at a volume ratio of 1: 100 to 1: 10000,
A filtration device for separating the coaggregate of the added scavenger and the radioactive substance;
An apparatus for removing radioactive substances from radioactively contaminated water.   At least one of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and two kinds of cylindrical diatomaceous earth filled with nano-sized Prussian blue and alginic acid polymer in the inner space, and nanocarbon Contains a scavenger consisting of a dispersion and activated carbon, and has a rubbing member made of an expandable / reducible urethane porous body, scrapes cesium adhering to the object and getting wet with water, and absorbs it with water, And the removal apparatus of the radioactive substance which can squeeze out water. In claim 23,
An apparatus for removing a radioactive substance, wherein the rubbing member is attached to the tip of a handle member in a mop shape. In claim 24,
The handle is a radioactive substance removing device having a discharge pipe that sucks and discharges water absorbed by the porous body.