JP2013174571A - Method for reducing radiation of radioactive material contaminated water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reduce radiation of water contaminated by radioactive material, and to reduce radiation of fittings used to reduce radiation of contaminated water without discharging radioactive waste in the process of reduction.SOLUTION: A method comprises a first filtering step for removing particles contaminated by radioactive material contained in contaminated water, a second filtering step for removing fine particles contaminated by radioactive material contained in the contaminated water, a third step for reducing radiation of the water by bringing the contaminated water with the particles contaminated by the radioactive material removed therefrom into contact with nano pure silver particle carrier, and a fourth step for reducing radiation of filtered objects from the first and second filtering steps and the fittings used in the respective first, second and third steps. The contaminated water with solid matter removed and the removed solid matter are separated from each other and respectively brought into contact with nano pure silver particles.

Description

      The present invention relates to a method for reducing the radiation of water contaminated with radioactive material. Specifically, water that has been washed by roofs and buildings that are contaminated with radioactive materials and decontaminated, or water after road cleaning or water that has been contaminated with radioactive materials is brought into contact with the nanopure silver particle carrier and released from the contaminated water. The present invention relates to a method for reducing radiation.

      The Fukushima Daiichi Nuclear Power Station was unable to cool the reactor due to the damage of the tsunami due to the Great East Japan Earthquake, causing a hydrogen explosion, a large amount of radioactive material diffused over a wide area, and residents had to evacuate It is a serious situation. The government says that the evacuated residents can return home and live safely, and the buildings, etc. are washed with high-pressure washing water to decontaminate, but this method only removes radioactive materials deposited on the buildings, etc. The treatment of the contained wash water is not clear. If washing water is allowed to flow as it is, it will soak into the ground and contaminate the groundwater, and further to the sea through the river, and eventually the human being will be damaged by organisms contaminated with high concentrations of radioactive substances by the food chain. There are serious concerns. Contaminated water uses a method of agglomerating particles contaminated by radioactive substances contained in the contaminated water with a flocculant and filtering with a filter, but this method cannot reduce the radiation and radioactive waste. Just increasing the amount of material, it takes a huge disposal site and a huge expense. Moreover, a method for reducing the radiation from water has not been established.

Nanopure silver particles are silver having a particle size of about 3 to 10 nanometers or less, and nanopure silver particles have a specificity that instantly returns to the original metal state even when silver ions jump out, The potential difference of the electric energy generated at that time is 1600 mV or more, and a large electric vibration is generated with an extremely short period of 10 ⁻⁶ sec or more. It is thought that this electrical vibration converts the energy of the radiation into harmless.

      The technical problem of the present invention is to efficiently reduce the radiation of water contaminated with radioactive materials, and to reduce the radiation of instruments used for radiation reduction of contaminated water without discharging radioactive waste in the process of reduction. An object of the present invention is to provide a method for reducing the radiation of radioactive material-contaminated water.

      In order to solve the above problems, the inventors have continued research on water purification using nanopure silver particles. After the explosion accident at the Fukushima nuclear power plant, we conducted a purification test and measurement of radioactive contaminated water using nanopure silver particles or nanopure silver particles carrying nanopure silver particles on granite or bone charcoal, and the initial value of 20000 Bq / kg of contaminated water Is confirmed to be ND (not detected). Moreover, it has also been confirmed that the numerical value of radiation decreases by spraying a solution containing nanopure silver particles to contaminated soil.

      Based on the above findings, the present inventors have come up with a method for reducing the radiation emitted from radioactive material contaminated water safely and efficiently. The gist is as follows.

      That is, the radiation reducing method for radioactive material contaminated water of the present invention includes a first filtration step for removing particles contaminated with radioactive substances contained in the contaminated water, and a fine contamination contaminated with radioactive substances contained in the contaminated water. A second filtration step for removing particles, a third step for reducing the radiation by bringing the contaminated water from which these particles contaminated with radioactive substances have been removed into contact with the nanopure silver particle support, It consists of the 4th process of reducing the radiation by making the filtrate used from the filtration process of 2 and the instrument used by each 1st, 2nd, 3rd process contact nanopure silver particle liquid.

      In the present invention, radioactive material-contaminated water consists of particles contaminated with radioactive material and water contaminated with radioactive material, and these simultaneous treatments cannot efficiently reduce radiation. Since the treatment efficiency of the contaminated water is determined depending on whether the fine particles contaminated with the substance can be removed, the first and second particles for removing the particles contaminated with the radioactive substance contained in the contaminated water and the fine particles are removed. The filtration step, the third step in which contaminated water from which particles contaminated with the radioactive material have been removed are brought into contact with the nanopure silver particle carrier to reduce the radiation of the water, and the radioactive material filtered in the first and second steps. The radioactive material contaminated water radiation can be efficiently reduced by immersing / contacting the filtered product and the instruments used in the first, second, and third steps with the nanopure silver particle solution.

      According to the present invention, radioactive substance-contaminated water is separated into radioactive substance-contaminated particles and contaminated water, and the separated contaminated water can be brought into contact with the nanopure silver particle carrier to efficiently reduce radiation. . In addition, the instruments used for reduction and the separated contaminant particles are immersed and brought into contact with the nanopure silver particle solution, so that radiation of the instruments and contaminant particles can be reduced, and there is no fear of diffusing radioactive materials. Radiation of substance-contaminated water can be reduced.

  It is a schematic diagram of a system showing the first to third steps of the present invention.   It is a schematic diagram of the water nano pure silver particle support body contact part used at the 3rd process of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 and FIG. 2 show examples of devices used in the radiation reducing method for radiation-contaminated water according to the present invention, and those having the same purpose and effect are included in the scope of the gist of the present invention. Needless to say.

      FIG. 1 is a schematic diagram of a system showing the first to third steps of the radioactive substance contaminated water radiation reduction method according to the present invention. Reference numeral 1 denotes a reduction system, which is a raw water tank 2, a raw water pump 3, and a filter press. 4, a filter 5, a relay tank 6, and a reduction unit 7. The reduction unit 7 includes a treatment pump 71 and a treatment water cartridge 72.

      In the first step, reference numeral 2 denotes a raw water tank for storing polluted water such as water generated by decontamination work such as water for washing a building, water after road washing, or pond water contaminated with radioactive substances. 3 is a raw water pump which sends the contaminated water stored in the raw water tank 2 to the filter press 4 which is a 1st process. 4 is a filter press that filters and removes solids such as soil and dirt contaminated with radioactive substances contained in the contaminated water sent by the raw water pump 3, and this filter press 4 is composed of multiple stages of filters. In the filter, the filter mesh is selected depending on the particle composition contained in the contaminated water to be filtered, and the filtration efficiency can be changed by changing the number of stages of the filter. Solids such as soil and dust filtered in the first filtration treatment step are pressed into cake-like solids with little moisture, and are rendered harmless by being immersed in the nanopure silver particle solution in the fourth step. Moreover, since the used filter is detoxified by being immersed in the nanopure silver particle solution, it can be incinerated as a general waste.

      In the second step 5, fine solid particles that were not removed by the filter press 4 are removed from the water from which the solid matter such as soil and dirt contaminated with radioactive substances has been removed from the contaminated water by the filter press 4. The filter is a finer filter than the filter used in the first step. The contaminated water from which fine solid particles are removed by the filter 5 is sent to the relay tank 6 and stored. In the second step, the solid matter of fine particles contaminated with radioactive substances is further removed from the contaminated water filtered in the first step, thereby increasing the efficiency of the radiation reduction process performed in the third step. . Since the filter used in the second step is made harmless by being immersed in the nanopure silver particle solution in the fourth step after use in the same manner as in the first step, it can be incinerated as a general waste.

      In the third step, 7 is a reduction unit that reduces the radiation of the contaminated water from which the solid substances contaminated with the radioactive substances in the first step and the second step are removed, and the contaminated water stored in the relay tank 6 is treated. Contaminated water is brought into contact with the nanopure silver particle carrier, such as nanopure silver particle granite and nanopure silver particle carrying bone charcoal, which are fed into the treated water cartridge 72 by the water pump 71 and loaded in the treated water cartridge 72. This reduces radiation. The contaminated water enters the cartridge from the lower part of the treated water cartridge 72 and comes into contact with nanopure silver particle-supported granite, nanopure silver particle-supported granite, nanopure silver particle-supported granite, and nanopure silver particle-supported granite, which are shown as examples. The reduced treated water S is discharged from the upper part of the cartridge. As shown in FIG. 2, four treated water cartridges 72 are used as one set, and the contaminated water is allowed to pass through four times to perform a reduction process. The four treatment water cartridges 72 are one set, and a four-continuous treatment configuration is obtained through a basic test. Nanopure silver, which is a nanopure silver particle carrier shown as an example, depending on the situation of contaminated water Corresponding by changing the order of contacting with contaminated water and the amount of nanopure silver particle support in the cartridge of granite, nanopure silver particle support bone charcoal, nanopure silver particle support granite, or increasing the number of sets of treated water cartridges 72 Is possible. Moreover, since a filter installation space is provided in the upper part in the treated water cartridge 72, finer particles contained in the contaminated water can be removed by installing a filter as necessary.

      In the fourth step, after use of these treated water cartridges 72, they can be reused by being immersed in a nanopure silver particle solution to reduce radiation and perform maintenance. Moreover, the cake-like solid substance discharged | emitted from the filter press 4 at a 1st process can be rendered harmless by being immersed in a nanopure silver particle liquid.

      In addition, the radiation reduction system can be enlarged in accordance with the amount of contaminated water treated, and the small radiation reduction system can be an on-vehicle type.

      Thus, according to the radiation reducing method for radioactive material contaminated water of the present invention, particles and fine particles such as soil and garbage contaminated with radioactive material contained in the contaminated water are removed from the contaminated water, and moisture and solid content are removed. Can be efficiently reduced by performing the radiation reduction treatment separately. In addition, the instruments used for reduction and the filtered solid matter are immersed in the nanopure silver particle solution and detoxified, so there is no fear of diffusing radioactive materials and the instruments can be reused. . Those that cannot be reused such as filters are also detoxified and can be disposed of as general waste.

      By using the radioactive material contaminated water radiation reduction method of the present invention for decontamination of radioactive materials, it is possible to realize the return home of residents who have been forced to evacuate due to the large amount of radioactive materials scattered from the Fukushima nuclear power plant, You can live a safe life without worrying about the effects of radiation.

1: Reduction system 4: Filter press 5: Filter 7: Reduction unit 72: Treated water cartridge S: Treated water

Claims (1)

A first filtration process for removing particles contaminated with radioactive substances contained in contaminated water, a second filtration process for removing fine particles contaminated with radioactive substances contained in contaminated water, and contamination with radioactive substances A third step of bringing the contaminated water from which these particles have been removed into contact with the nanopure silver particle carrier to reduce radiation, the filtrate from the first and second filtration steps, and the first, second, second A method for reducing the radiation of radioactive material-contaminated water, comprising a fourth step of reducing radiation by bringing the instruments used in each of the steps 3 into contact with a nanopure silver particle liquid.

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