JP2013113658A - Method for removing radioactive cesium in air and device for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing radioactive cesium for collecting radioactive cesium which becomes a fine floating contaminant floating in the air by being adhered to water particles having fine particle diameters of 50 μm or less to be replaced with fresh air, and a device for the same.SOLUTION: In a method, cluster water is sprayed in the contaminated air containing radioactive cesium, water containing contaminated fine particles obtained by adhering the radioactive cesium to the cluster water is sent to a suction chamber 5 with the air, the water containing the contaminated fine particles is deposited in the suction chamber 5, the air is transmitted to an air purification chamber 7, the cluster water is sprayed in the air purification chamber 7, adhered to the remaining radioactive cesium contained in the air in the air purification chamber 7, they are deposited as the water containing the contaminated fine particles, the decontaminated air from which the radioactive cesium is removed is discharged in the atmosphere, deposited water containing the contaminated fine particles is discharged to a radioactive cesium removal chamber 9 in which iron bacteria is arranged, and the radioactive cesium is adsorbed and fixed by the iron bacteria.

Description

  In the present invention, by spraying cluster water into the air, the radioactive cesium present in the air is bound to the cluster water, the bound water is recovered, the radioactive cesium is adsorbed and fixed to the iron bacteria, More particularly, the present invention relates to a method and apparatus for removing the radioactive cesium.

The Great East Japan Earthquake caused great damage to the nuclear power plant in Fukushima, and a large amount of radioactive cesium (cesium 134, 137) was scattered in the air in a wide area due to the effects of wind and rain. The Ministry of Education, Culture, Sports, Science and Technology announced that the area exceeding the 10,000 becquerel / 1m ² accumulation amounted to 13 prefectures and over 8% of Japan. Most of them fell to the ground surface, but they were treated and cleaned in debris disposal, dust during topsoil treatment, cleaning outside the house, indoor walls and floors in schools, warehouses and work rooms for vegetables and fruits, etc. There is a risk that radioactive cesium will float around the work again, and ponds and swamps continue to contain a lot of radioactive cesium.

  Even now, more than 20 years after the nuclear accident in Chernobyl, it has been reported that internal bombings caused by radioactive cesium continue in the surrounding residents. When the amount of radioactive cesium in children living in Belarus was examined, it was reported that an average of about 4,500 becquerels, of which about 20%, had over 7,000 becquerels.

  As a result of examining the brain, myocardium, kidney, liver, etc. of adults and children who died in Belarus in 2003, it was reported that radioactive cesium was detected in all 8 organs. In particular, cesium 137 has the property of easily concentrating on muscles and bones. One of the causes of this internal exposure is said to be in surrounding foods that are still contaminated. It has been reported that the amount of radioactive cesium in the body has decreased considerably when the surrounding children have been moved to a clean area for three months.

  The above facts and the half-life of cesium 137 are said to be about 30 years, and removal and recovery of radioactive cesium in the air, the surface of the earth, or liquids such as ponds and swamps, etc. are urgent, but have not progressed slowly. This is the actual situation.

  The following patent document proposes a material capable of efficiently recovering cesium in an aqueous solution and a method for recovering the same, and the recovered material is a reduced state oxidized / reduced insoluble iron cyano complex salt. Cesium is adsorbed by bringing the material into contact with cesium. And it is the collection | recovery method of the cesium in the aqueous solution which isolate | separates cesium from aqueous solution, processes this oxidation-reduction type insoluble iron cyano complex salt with an oxidizing agent, and converts it into an oxidation state.

  However, when the iron cyano complex is inhaled by the human body, it deposits in the deep lung, adsorbs the water-soluble cesium 137 taken in, and causes extremely severe internal exposure to β-rays in the alveolar tissue. It is known. Therefore, there is a concern that the use in an environment where radioactive cesium is present will cause serious damage.

  In addition, the iron cyano complex salt has low radiocesium adsorption performance, and a large amount of iron cyano complex salt must be used in order to produce a certain level of adsorption effect effective for the radiocesium. In a public experiment of Tokyo Institute of Technology conducted in April 2011, as much as 1 g of iron cyano complex salt was used for 100 mL of simulated contaminated water containing 10 ppm of cesium.

JP-A-5-254828

  In the present invention, radioactive cesium, which becomes a fine suspended contaminant considered to be suspended in the air, such as cesium 137 having a particle size of about 0.01 μm to 10 μm, is attached to water particles having a fine particle size of 50 μm or less. The present invention provides a method and apparatus for removing radioactive cesium that is recovered and replaced with fresh air.

  The present invention sprays cluster water in contaminated air containing radioactive cesium, takes in the contaminated fine particle-containing water in which the radioactive cesium is adhered to the cluster water into the suction chamber together with air, and in the suction chamber contains the contaminated fine particle-containing water. In addition, the air is sent to the air purification chamber, the cluster water is sprayed in the air purification chamber, adhered to the remaining radioactive cesium contained in the air in the air purification chamber, and precipitated as contaminated fine particle-containing water. The decontaminated air from which radioactive cesium has been removed is discharged to the atmosphere, and the precipitated fine particle-containing water is discharged to a radioactive cesium removal chamber in which iron bacteria are arranged, and the radioactive cesium is adsorbed and fixed by the iron bacteria. Decontaminated water from which radioactive cesium has been removed is characterized by a method for removing radioactive cesium in air that is used as ordinary water. That.

  Moreover, the said cluster water is made into the fine water particle of 50 micrometers or less, It is characterized by the method of removing the radioactive cesium in the air sprayed in a smoke state.

Furthermore, the iron bacteria oxidized water-soluble divalent iron ions Fe ²⁺ or divalent manganese ions Mn ^2+, and produced ferric hydroxide Fe (OH) ₃ or manganese dioxide MnO ₂ precipitates. It is characterized by a method for removing radioactive cesium in the air as bacteria.

  In addition, a spray chamber for spraying cluster water into the contaminated air containing radioactive cesium, a suction chamber provided with a fan for sucking together with air the contaminated fine particle-containing water with radioactive cesium attached to the cluster water, and the suction chamber Precipitating contaminated fine particle-containing water, and precipitating contaminated fine particle-containing water in which radioactive cesium contained in the air taken in the air purification chamber for purifying the collected air is adhered to the cluster water, A sedimentation chamber for both, a discharge port for delivering the cluster water to the purified air from which the radioactive cesium has been removed, and at the same time a discharge port for discharging the contaminated fine particle-containing water to the outside from the sedimentation chamber, the discharge port Radioactive cesium removal chamber in which iron bacteria are passed to pass water containing contaminated fine particles discharged, and decontaminated water from which the radioactive cesium has been removed Wherein the device for removing radioactive cesium become more air decontamination water chamber for storing.

  Further, the suction chamber is provided with a suction fan at the upper side, and a sedimentation chamber with an open upper part for stocking contaminated fine particle-containing water to which radioactive cesium and other fine contaminants are attached below. Featuring a radioactive cesium removal device.

  The air purification chamber is provided with an air flow passage through which air sucked into the suction chamber flows on one side and an air flow passage through which fresh air flows out to the spray chamber on the other side. An appropriate number of individual air purification chambers partitioned by walls are formed, and the nozzles at the tips of the water supply pipes connected to the water supply tank are exposed in the individual air purification chambers, and the nozzles flowed out at a high speed due to the pump pressure. The present invention is characterized by a device for removing radioactive cesium in the air, which is formed by causing fine water particles to collide with a substance to be collided to form smoke and depositing radioactive cesium on the smoke.

  Furthermore, the radioactive cesium removal chamber is an all-round inclined water channel that folds from the top to the bottom, and causes the contaminated fine particle-containing water containing radioactive cesium to flow out over the iron bacteria disposed on the surface of the water channel. It is characterized by a device for removing radioactive cesium in air by combining bacteria and radioactive cesium.

  The method and apparatus for removing radioactive cesium in air according to the present invention sprays fine water particles of 50 μm or less into a predetermined space in the form of water smoke to remove fine contaminants such as radioactive cesium floating in the predetermined space. Capture and remove these fine contaminants into the radioactive cesium removal device, and the fresh air from which the radioactive cesium has been removed is sprayed again into the predetermined space where the radioactive cesium is to be removed. On the other hand, radioactive cesium adheres to iron bacteria and can be reasonably captured to produce fresh water.

  In addition, the removal of radioactive cesium and other fine contaminants from the contaminated air containing radioactive cesium and the spraying of fresh fine water particles can be circulated, so that radioactive cesium can be efficiently carried out in many predetermined spaces. It was possible to exchange air containing fresh and fresh air, and to obtain a comfortable environment for the body.

  Furthermore, the radioactive cesium of 50 μm or less floating in a predetermined space easily adheres to fine water particles having the same particle diameter or clustered water particle diameter of 50 μm or less, and efficiently removes the radioactive cesium. It became possible.

  Also, the radioactive cesium removal device can be easily assembled at the site and can also be moved, so that it can remove radioactive cesium and other fine floating contaminants not only indoors but also outdoors. Became possible.

The schematic of the apparatus which removes the radioactive cesium of this invention. FIG. Sectional drawing which shows a suction chamber, an air purification chamber, and a spraying chamber. Sectional drawing of the 1st nozzle position in an air purification chamber. Sectional drawing of the 2nd nozzle position in an air purification chamber. Sectional drawing of a radioactive cesium removal chamber. The graph which shows a time-dependent change of a cesium chloride density | concentration. The graph which shows the change of a cesium chloride solution.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic diagram of a method and apparatus for removing radioactive cesium (134, 137) of the present invention. The radioactive cesium removal apparatus 1 is a spray chamber 3 provided with a blower fan 2 for spraying cluster water for adhering the radioactive cesium in the contaminated air to the cluster water, air containing contaminated fine particles containing radioactive cesium in the air. A suction chamber 5 provided with a suction fan 4 for suction, a sedimentation chamber 6 for precipitating water containing contaminated fine particles containing radioactive cesium sucked into the suction chamber 5, and residual radioactive cesium contained in the taken-in air An air purification chamber 7 for removing water, a sedimentation chamber 6 connected to the cluster water in the air purification chamber 7 to precipitate water containing contaminated fine particles containing radioactive cesium, and a precipitation chamber 6 connected to the sedimentation chamber 6 to remove the radioactive cesium The discharged purified air is sent to the spray chamber 3, and the discharge port 8 for discharging the contaminated fine particle-containing water from the settling chambers 6 and 6a to the outside. Radioactive cesium is combined with iron bacteria by passing water containing contaminated fine particles containing radioactive cesium discharged from 8 through a narrow passage. Radioactive cesium removal chamber 9 and decontamination water chamber for storing water from which radioactive cesium has been removed 10.

  FIG. 2 shows a perspective view of the radioactive cesium removing apparatus 1. A sedimentation chamber 6 is provided below the suction chamber 5, a first partition wall 11 is provided between the suction chamber 5 and the air purification chamber 7, and air communicates between both chambers on the bottom plate side. A flow passage 12 is provided.

  The air purification chamber 7 is provided with an appropriate number of chambers 7a, 7b,... As necessary, and the second partition wall 11a, the third partition wall 11b,. The flow passages 12a, 12b,... Are provided.

  The first partition wall 11 is formed to hang down from a position in contact with the ceiling surface, and has a gap in which an air flow passage 12 is formed on the bottom plate side of the air purification chamber 7. From the position of the water storage surface of the sedimentation chamber 6 a on the bottom plate side in the air purification chamber 7, the upper portion opened up is opened to form an air flow passage 12 a, and the lower part is a partition wall 13 of the sedimentation chamber 6. A partition wall 11a is formed, and a lower partition is opened to form an air flow passage 12b, and a third partition wall 11b,... Are formed as necessary in order, and the first partition wall 11, the second partition wall 11a, Air flow passages 12, 12a, 12b,... Meandering in the vertical direction are formed by the third partition walls 11b,.

  The air purification chamber 7 includes residual radioactive cesium floating in the air that could not be stored in the sedimentation chamber 6 among the fine water particles adhering to the fine floating contaminants containing radioactive cesium taken from the outside atmosphere. Is received and purified from the suction chamber 5. In the air purification chamber 7, which is a space adjacent to the suction chamber 5, a first nozzle 15 serving as a tip of a first water supply pipe 14 connected to a water supply tank for obtaining fresh water protrudes, and the first nozzle The high-pressure water ejected from the pump 15 by the pressure of the pump 16 is caused to collide with the colliding object 17 to generate the water smoke as fine water particles, capture the radioactive cesium with the cluster water by the water smoke, and reach the spray chamber 3. Residual radioactive cesium previously suspended in the air is removed and deposited in the lower sedimentation chamber 6a.

  The air containing radioactive cesium floating in a predetermined space is formed on the upper part of the radioactive cesium removal apparatus 1 by adsorbing the radioactive cesium having a particle size of about 0.01 μm to 10 μm to the sprayed fine water particles having a particle size of 50 μm or less. Although the air is taken into the suction chamber 5 through the air intake port, contaminated air can be forcibly and efficiently taken in with the fine water particles containing radioactive cesium by the suction fan 4 provided at the air intake port.

  A sedimentation chamber 6 having a predetermined depth for stocking contaminated water is provided below the suction chamber 5, and at least between the upper surface of the contaminated water accumulated in the sedimentation chamber 6 and the lower end of the first partition wall 11. An air flow passage 12 is formed, and the first partition wall 11 protrudes from the side wall so as to close the space on the ceiling side, thereby forming a predetermined space and an air flow passage.

  The second partition wall 11a rises from the bottom plate, has a lower side as a partition wall 13 with the sedimentation chamber 6, and is attached to the side wall so that an air flow passage 12a is formed on the upper side.

  The contaminated air containing radioactive cesium is taken into the suction chamber 5 from the air intake port, and the contaminated fine particle-containing water adhering to the radioactive cesium is added with weight so that it naturally descends downward and at the same time the suction fan 4 The forced air introduction causes a downward air flow, which is absorbed by the stored water in the sedimentation chamber 6. Radioactive cesium is stocked in the sedimentation chamber 6 in a state of adhering to fine water particles.

  The air from which the contaminants adhering fine water particles containing radioactive cesium have been removed as described above passes through the air flow passage 12 from the suction chamber 5 and the side walls, the first partition wall 11 and the second partition wall 11a. To the air purification chamber 7 formed by the above. A first water supply pipe 14 protrudes from the side wall above the intermediate portion between the first partition wall 11 and the second partition wall 11a, and the first water supply pipe 14 has a first nozzle 15 formed at the tip thereof. . The first nozzle 15 is fixed to one end of the first U-shaped metal fitting 18. As shown in FIG. 4, the first U-shaped metal fitting 18 with the tip of the first nozzle 15 fixed is attached with the U-shaped open portion facing upward. A collided object 17 such as a sphere is fixed to the other end side of the first U-shaped metal fitting 18.

  Fine water particles are produced by colliding the high-pressure water ejected from the first nozzle 15 with the object to be collided 17, and the residual radioactive cesium sucked into the air purification chamber 7 adheres to the weight of the fine water particles. Is added, and descends due to its weight, and is stocked in the sedimentation chamber 6a in the lower part, but the fine water particles that have not adhered to the radioactive cesium are in a floating state because they are light, and are introduced into the adjacent air purification chamber 7a. Will be.

  In addition, as shown in FIG. 5, the second water supply pipe 19 and the second nozzle projecting from the side wall are separately provided in the side wall to be the next air purification chamber 7 a and the space between the second partition wall 11 a and the third partition wall 11 b. 20 is formed. Similarly to the above, the tip of the second nozzle 20 is fixed to one end of the second U-shaped bracket 21, and a collision object 22 such as a sphere is fixed to the other end. The second U-shaped metal fitting 21 is attached and formed with the U-shaped opening part facing down. Similarly to the above, the water ejected from the second nozzle 20 is collided with the collision target object 22 by the high pressure of the pump 16 and sprayed as fine water particles.

  The contaminated air containing radioactive cesium taken into the suction chamber 5 is removed by the above-described air purification chambers 7, 7 a,. The air thus passed passes through an appropriate number of partition walls and air flow passages in a meandering manner, and in the passage process, radioactive cesium is attached to the spray water to add weight, and descends to the precipitation chambers 6, 6a,. The air purified by appropriately passing through the air purification chambers 7, 7a,... Is fresh as light fine water particles by the forcing force of the blower fan 2 formed in the air intake port from the spray chamber 3 in the final stage. It will be sprayed in a predetermined space with air.

  The contaminated air containing radioactive cesium is purified in the process of moving in a meandering manner in the space in the air purification chamber 7, but most of it is purified in the air purification chamber 7 having the first nozzle 15. become. As described above, the water ejected from the first nozzle 15 collides with the colliding object 17 such as a sphere. The first water supply pipe 14 connected to the first nozzle 15 is, for example, about 14 mm, and the diameter of the outlet of the first nozzle 15 at the tip is about 0.2 mm. In this case, the pressurizing force of the pump 16 connected to the first water supply pipe 14 is 1.0 MP, and water is jetted at a pressure of 10 KMP to collide with the colliding object 17 separated by about 80 mm. . Due to this collision, a lot of water is made into fine water particles having a particle diameter of 50 μm or less, sprayed as water smoke, and released in a floating manner.

  In addition, the second nozzle 20 similar to the first nozzle 15 connected to the second water supply pipe 19 with respect to the air that has entered from the air flow passage 12a above the second partition wall 13 has an open portion. Opposite the object to be collided 22 provided on the second U-shaped bracket 21 fixed downward, and the water pressurized to 1.0 MP by the pump 16 from the second nozzle 20 is caused to collide with the object to be collided 22 As above, water smoke is generated.

  Each of the above-described water smoke is finally sprayed into a predetermined space from the water smoke outlet by the forcing means by the blower fan 2 of the spray chamber 3 together with fresh air. The spraying may be performed by providing the same smoke generator as the first and second nozzles 15 and 20 in the spraying chamber 3 or may be introduced from the adjacent chamber by the blowing fan 2. The sprayed fine water particles with a particle size of 50 μm or less are contaminated with radioactive cesium floating in a predetermined space, as well as contaminated particles that are almost the same as or slightly larger than the size of contaminated particles such as dust, bacteria, smoke or odor. As described above, it is trapped, adhered, and absorbed by the radioactive cesium removing device 1 to be a circulation type device that can repeat the same.

  The water supplied from the first water supply pipe 14 and the second water supply pipe 19 to the first nozzle 15 and the second nozzle 20 is provided as fresh water from a separate water tank connected to the radioactive cesium removing device 1. Become.

  Further, radioactive cesium taken into the suction chamber 5 and other pollutants in the contaminated air are stocked as stored water in the sedimentation chambers 6, 6a,... Will be discharged.

  The contaminated water containing radioactive cesium discharged from the discharge port 8 is taken into the radioactive cesium removal chamber 9 shown in FIG. The radioactive cesium removal chamber 9 forms a fully-folded stepped inclined water channel 23 that folds between opposing side walls in a three-dimensionally formed box-like body, and the radioactive cesium is placed on a plurality of stepped shelves 24. It is configured as a water channel 23 through which contaminated fine particle-containing water flows out, and iron bacteria 25 are arranged on the shelf 24 thereof. Protrusions 26 are formed on the shelf 24 at predetermined intervals, and iron bacteria 25 are disposed upstream of the water channel 23 in front of the protrusions 26.

The iron bacteria 25 is performed by arranging the powder in front of the protrusions 26 on the shelf 24. Thus, 1 to 10 μm / piece of iron bacteria 25 is placed on the shelf 24 at a rate of 2000 to 300 billion / cm ² , and about 30 to 50 mg is disposed. By passing the contaminated water containing radioactive cesium through the shelf 24 on which the iron bacteria 25 are disposed, the iron bacteria 25 and the radioactive cesium are ionically coupled, and the radioactive cesium is adsorbed and fixed to the iron bacteria 25. Become. The water from which radioactive cesium and the like have been removed is discharged to the decontamination water chamber 10. The iron bacteria 25 can be disposed by pressing the protrusions 26 so as to cover the fine ridges or nets.

  Radioactive cesium is a kind of alkali metal and has the highest reactivity among alkali metals. It is an element that is easily ionized and reacts strongly with water. Cesium hydroxide has the strongest alkalinity among alkali hydroxides, and further reacts directly with nitrogen, carbon and hydrogen, and is immediately oxidized at room temperature in air.

  On the other hand, it has been confirmed that iron bacteria, like other metals, take in the above-mentioned alkali metal radioactive cesium as an energy source. Iron bacteria are considered to act effectively on the removal of radioactive metals such as radioactive cesium contained in trace amounts in the environmental water, and accumulate these radioactive cesium and the like in the microbial cells. Since iron bacteria are filamentous bacteria having a sheath, they have a large specific gravity and form slime. Therefore, when inoculated and propagated on a surface having a large surface area, a large amount of water can be treated. In addition, the sedimentation rate is high, the separation from water is easy, no special equipment is required for the collection of radioactive cesium and the like, and it is only necessary to collect the precipitated contaminated water. Iron bacteria have a smaller volume when they are naturally dried after their recovery.

  Using the characteristics of the above radioactive cesium and iron bacteria, the contaminated water adsorbed with radioactive cesium is continuously removed in the radioactive cesium removal chamber 9 by the radioactive cesium removal chamber 9 as in the above embodiment. It is discharged to the decontamination water chamber 10 as dyeing water and reused as pure water.

  As an experiment for recovering radioactive cesium in air, a sealed space (vertical 2.0 m × width 2.0 m × height 2.0 m) was formed. In this sealed space, cesium chloride that is relatively harmless with a substance equivalent to radioactive cesium (134, 137) is used, and 10 mg / L of the cesium chloride solution is finer than the same apparatus as the radioactive cesium removal apparatus shown in Example 1. A water cluster was sprayed. Sprayed at 8 mL / min for 3 hours. In calculation, 14.4 mg of cesium chloride is released into the space. The above cesium chloride solution was diluted with a cesium chloride standard solution (1 g / L).

  Thereafter, in order to recover cesium chloride in the air, a fine cluster of pure water was sprayed at 20 mL / min from the apparatus or another radioactive cesium removing apparatus and combined with the previously sprayed cesium chloride. The recovered solution was 3.6L. Since the amount of cesium contained in the recovered water was 13 mg, the recovery rate of cesium chloride in this experiment was about 90%. It was verified that cesium chloride floating in the enclosed space could be efficiently recovered.

  The cesium chloride water collected by the above was sent to the same radioactive cesium removal chamber as in Example 1. As the iron bacteria in the radioactive cesium removal chamber, those identified as Leptostrix sp. Were used. Cesium chloride was added to 100 mL of pure water so that the final concentration was 10 mg / L, and 5 g of wet cells were added, followed by culturing at 25 ° C. with aeration. After a certain time, the culture solution and the cesium in the microbial cells were quantified and compared.

  The result as shown in FIG. 7 was obtained. The concentration of cesium in the culture solution, which was initially 10 mg / L, decreased rapidly and became almost 0 after 18 hours. On the other hand, when the same amount of the bacterial suspension was centrifuged, it increased with time. This indicates that cesium was taken into the cells and disappeared from the culture solution. Leptocilix bacteria are known to have a sheath, indicating that the cesium is the result of accumulation in the sheath.

  The concentration of cesium chloride in the air decreased from 0.0012 mg / L to almost 0 before and after the operation of the radioactive cesium removal apparatus.

  As a result of the above experiment, it was shown that the radioactive cesium removal apparatus can efficiently collect the radioactive cesium existing in the air as a water solution by binding the radioactive cesium to the cluster water. In addition, iron bacteria, like other metals, have been confirmed to incorporate alkali metal cesium as an energy source. Iron bacteria are considered to act effectively on the removal of radioactive metals such as radioactive cesium contained in trace amounts in the environmental water, and the radioactive cesium and the like accumulate in the cells. Since it is a filamentous bacterium with a sheath, it has a large specific gravity and forms a slime. Therefore, when it is inoculated and propagated on a surface having a large surface area, it is possible to treat a large amount of water. In addition, since the sedimentation rate is high and separation from water is easy, no special device is required for the collection of radioactive cesium or the like, and it is only necessary to collect the sediment. After recovery of bacteria, the volume is further reduced by natural drying. In addition, a small volume can be solidified, sealed and stocked.

DESCRIPTION OF SYMBOLS 1 Radiocesium removal apparatus 2 Blowing fan 3 Spraying chamber 4 Suction fan 5 Suction chamber 6 Sedimentation chamber 7 Air purification chamber 8 Outlet 9 Radioactive cesium removal chamber 10 Decontamination water chamber 11 1st partition wall 12 Air flow path 13 Partition wall 14 1st water supply pipe 15 1st nozzle 16 Pump 17, 22 Collision object 18, 21 U-shaped metal fitting 19 2nd water supply pipe 20 2nd nozzle 23 Water channel 24 Shelf 25 Iron bacteria 26 Protrusion

Claims (7)

  Cluster water is sprayed into the contaminated air containing radioactive cesium, and the contaminated fine particle-containing water in which the radioactive cesium is attached to the cluster water is taken into the suction chamber together with air, and the contaminated fine particle-containing water is precipitated in the suction chamber. The air is sent to the air purification chamber, the cluster water is sprayed in the air purification chamber, adhered to the remaining radioactive cesium contained in the air in the air purification chamber, and precipitated as water containing contaminated fine particles. The removed decontaminated air is discharged into the atmosphere, and the precipitated contaminated water containing fine particles is discharged into a radioactive cesium removal chamber in which iron bacteria are arranged, and the radioactive cesium is adsorbed and fixed by the iron bacteria. The method for removing radioactive cesium in air, wherein the decontaminated water removed is used as ordinary water.   The method for removing radioactive cesium in air according to claim 1 or 2, wherein the cluster water is formed as fine water particles of 50 µm or less and sprayed in a smoke state. The iron bacterium oxidizes water-soluble divalent iron ion Fe ²⁺ or divalent manganese ion Mn ²⁺ , and generates a precipitate of ferric hydroxide Fe (OH) ₃ or manganese dioxide MnO _2. The method for removing radioactive cesium in the air according to any one of claims 1 to 3.   A spray chamber for spraying cluster water into contaminated air containing radioactive cesium, a suction chamber provided with a fan for sucking together with air the contaminated fine particle-containing water with radioactive cesium attached to the cluster water, and taken into the suction chamber Precipitating contaminated fine particle-containing water and precipitating contaminated fine particle-containing water adhering to the cluster water and radioactive cesium contained in the air taken in the air purification chamber for purifying the air taken in, And a discharge port for discharging the contaminated fine particle-containing water to the outside from the settling chamber and discharging from the discharge port at the same time as sending to the spray chamber for adding cluster water to the purified air from which the radioactive cesium has been removed A radioactive cesium removal chamber in which iron bacteria that allow the contaminated fine particle-containing water to pass are disposed, and decontaminated water from which the radioactive cesium has been removed Removal apparatus of radioactive cesium in the air, characterized in that the more the decontamination water chamber.   The suction chamber is provided with a suction fan at the top and a sedimentation chamber with an open upper portion for stocking contaminated fine particle-containing water with radioactive cesium and other fine contaminants attached below. Item 6. A device for removing radioactive cesium in air according to Item 5.   The air purification chamber is provided with an air flow passage through which air sucked into the suction chamber is circulated on one side and an air flow passage through which fresh air flows out to the spray chamber on the other side. An appropriate number of individual air purification chambers are formed, and the individual air purification chambers expose a nozzle which is a tip of a water supply pipe connected to a water supply tank, and the nozzles discharge fine water particles that flow out at a high speed by pump pressure. The apparatus for removing radioactive cesium in air according to claim 5 or 6, wherein water smoke is made to collide with a substance to be collided, and radioactive cesium is deposited on the smoke and precipitated.   The radioactive cesium removal chamber is an all-round staircase that turns from top to bottom, and the contaminated microparticle-containing water containing radioactive cesium flows out over the iron bacteria disposed on the surface of the waterway. The apparatus for removing radioactive cesium in air according to any one of claims 5 to 7, wherein the apparatus is combined with cesium.

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