JP2019109144A - Decontamination reagent of radioactive contamination and production method thereof - Google Patents
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Description
本発明は、放射能汚染の除染剤およびその製造方法に関する。 The present invention relates to a radioactive contamination decontamination agent and a method of producing the same.
原子力発電所などの原子力関連施周辺では、放射性物質の取扱い作業により、土壌や水が汚染される可能性がある。また、一旦事故等が発生すると、周囲の広い範囲で汚染が広がることになる。放射能汚染を放置すると、近隣住民の外部被ばく、農作物による内部被ばく等の深刻な問題に発展する可能性があり、放射能汚染を速やかに除染する必要がある。 Handling of radioactive materials may contaminate soil and water around nuclear related facilities such as nuclear power plants. In addition, once an accident or the like occurs, the contamination will spread in a wide range of surroundings. If radioactive contamination is left unchecked, it may develop into serious problems such as external exposure to nearby residents and internal exposure by crops, so it is necessary to decontaminate radioactive contamination promptly.
放射能汚染の除染法として、ゼオライト、多孔質体に放射性物質イオンの吸着材を充填してナノカーボンを分散・固定した複合体などに放射性物質を吸着・捕集する方法が開示されている（特許文献１、２）。しかしながら、これらの方法は放射性物質を吸着した吸着剤が膨大な量になり、中間処理や最終処分の用地確保が問題となる。
As a method for decontamination of radioactive contamination, a method is disclosed in which a radioactive material is adsorbed and collected in a complex in which zeolite, a porous material is filled with an adsorbent of radioactive material ions and the nanocarbon is dispersed and fixed. (
放射能汚染土壌の除染方法として、乳酸菌を使用して土壌またはヘドロから放射性セシウムを放出させ、放出したセシウムをロドバクター・スファエロイデスＳＳＩ株の菌体に吸着させる方法が開示されている（特許文献３）。しかしながら、この方法も、菌体の回収や、回収した菌体の処理という問題がある。 As a method for decontaminating radioactively contaminated soil, a method is disclosed in which radioactive cesium is released from soil or sludge using lactic acid bacteria, and the released cesium is adsorbed to the cells of Rhodobacter sphaeroides SSI strain (patented) Literature 3). However, this method also has problems such as recovery of cells and treatment of the recovered cells.
また、複合微生物と腐植質とを有効成分として含有する放射性物質除染剤についての発明が開示されている（特許文献４）。しかしながら、この除染剤は、実質的に、乳酸菌、バチルス属細菌、シアノバクテリアおよび酵母を含む複合微生物と、軟質多孔性古代海洋腐植質とを要する複雑な組成のものである。 Moreover, the invention about the radioactive material decontamination agent which contains complex microorganisms and humic substance as an active ingredient is disclosed (patent document 4). However, this decontamination agent is essentially of a complex composition requiring complex microorganisms including lactic acid bacteria, Bacillus bacteria, cyanobacteria and yeast, and soft porous ancient marine humic substances.
本発明の目的は、放射能汚染の除染に有効な除染剤、およびその製造方法を提供することである。 An object of the present invention is to provide a decontamination agent effective for decontamination of radioactive contamination, and a method for producing the same.
本発明者は、上記課題に鑑み、鋭意研究を行った結果、豆類を乳酸菌で発酵して得られる発酵物が、放射能汚染の除染に有効であることを見出し、本発明を完成させた。 MEANS TO SOLVE THE PROBLEM In view of the said subject, this inventor discovered that the fermented substance obtained by fermenting beans with lactic acid bacteria was effective in the decontamination of a radioactive contamination, as a result of earnestly researching, and completed this invention .
すなわち、本発明は、
（１）大豆の乳酸菌発酵物を有効成分として含む、放射能汚染の除染剤；
（２）乳酸菌が、ラクトバチルス・パラカゼイ、ラクトバチルス・ファーメンタム、またはその混合物を含む、（１）の除染剤；
（３）乳酸菌が、植物由来である、（１）または（２）の除染剤；
（４）大豆の溶液またはスラリーを乳酸菌で発酵させることを特徴とする、（１）〜（３）のいずれかの放射能汚染の除染剤、の製造方法；
（５）（１）〜（３）のいずれかの除染剤を、放射能汚染された対象に添加することを特徴とする、放射能汚染の除染方法、
に関する。
That is, the present invention
(1) A radioactively contaminated decontamination agent containing a fermented product of lactic acid bacteria of soybean as an active ingredient;
(2) The decontamination agent of (1), wherein the lactic acid bacterium comprises Lactobacillus paracasei, Lactobacillus fermentum, or a mixture thereof;
(3) The decontamination agent of (1) or (2), wherein the lactic acid bacteria are of plant origin;
(4) A method for producing a radioactively contaminated decontamination agent according to any one of (1) to (3), which comprises fermenting a solution or slurry of soybean with lactic acid bacteria;
(5) A method for decontaminating radioactive contamination, which comprises adding the decontamination agent according to any one of (1) to (3) to a radioactively contaminated object,
About.
本発明によれば、様々な放射能汚染の除染に使用できる除染剤が提供される。本発明に係る除染剤は、豆類と乳酸菌とを原料とするものであり、安全性が高く、取扱いも容易である。 According to the present invention, a decontamination agent is provided which can be used for decontamination of various radioactive contaminations. The decontamination agent according to the present invention uses beans and lactic acid bacteria as raw materials, has high safety, and is easy to handle.
本発明は、ある態様において、豆類の乳酸菌発酵物を有効成分として含む、放射能汚染の除染剤を提供する。 The present invention provides, in one aspect, a radioactively contaminated decontaminant comprising, as an active ingredient, a lactic acid bacteria fermentate of legumes.
放射能汚染源となる放射性同位元素の中で主なものは、放射性ヨウ素（１３１Ｉ：ヨウ素１３１）と放射性セシウム（１３４Ｃｓ：セシウム１３４、１３７Ｃｓ：セシウム１３７）である。ヨウ素１３１は半減期が約８日、セシウム１３４は約２年、セシウム１３７は約３０年であり、本明細書では半減期の長いセシウムを指標とする。 Among the radioactive isotopes that become radioactive contamination sources, the major ones are radioactive iodine ( 131 I: iodine 131) and radioactive cesium ( 134 Cs: cesium 134, 137 Cs: cesium 137). The iodine 131 has a half life of about 8 days, the cesium 134 of about 2 years, and the cesium 137 of about 30 years. In this specification, cesium having a long half life is used as an index.
本態様における原料となる豆類は特に限定されず、大豆、小豆、エンドウ豆、インゲン豆、金時豆、うずら豆、ササゲ、緑豆、空豆、ヒヨコ豆、レンズ豆、落花生、イナゴ豆、クズなどが例示される。好ましくは、豆類は大豆である。使用できる大豆の種類も特に限定されず、丸大豆や半割れ大豆などの全脂大豆、油脂を除去した減脂大豆や脱脂大豆、豆乳、オカラ等が例示され、これらの少なくとも一つ以上を選択できる。好ましくは、大豆は全脂大豆である。 Beans used as a raw material in this embodiment are not particularly limited, and soybeans, azuki beans, peas, green beans, gold beans, quail beans, cowpeas, cowpeas, green beans, chickpeas, lentils, peanuts, locust beans, etc. It is illustrated. Preferably, the beans are soy. The type of soybeans that can be used is not particularly limited, and whole soybeans such as whole soybeans and half-split soybeans, reduced-fat soybeans from which fats and oils have been removed, defatted soybeans, defatted soybeans, soy milk, okara, etc. are exemplified, and at least one or more of these are selected. it can. Preferably, the soy is a full fat soy.
本態様において使用される乳酸菌の種類は特に限定されないが、好ましくはラクトバチルス属の乳酸菌である。好ましいラクトバチルス属の乳酸菌の例として、ラクトバチルス・アシドフィラス、ラクトバチルス・ブレビス、ラクトバチルス・ブクネリ、ラクトバチルス・ブルガリカス、ラクトバチルス・カゼイ、ラクトバチルス・デルブルエッキ、ラクトバチルス・ファーメンタム、ラクトバチルス・ガセリ、ラクトバチルス・ヘルベティカス、ラクトバチルス・ヒルガルディ、ラクトバチルス・ジョンソニィ、ラクトバチルス・レイクマニ、ラクトバチルス・ラクチス、ラクトバチルス・パラカゼイ、ラクトバチルス・プランタラム、ラクトバチルス・ラムノサス、ラクトバチルス・ロイテリ、ラクトバチルス・サリバリウス等が挙げられる。さらに好ましい例は、ラクトバチルス・パラカゼイ、ラクトバチルス・ファーメンタムである。これらの乳酸菌は、１種類を用いても良いし、複数種を用いてもよい。また、乳酸菌の由来は特に限定されず、腸管系乳酸菌、動物由来乳酸菌、植物由来乳酸菌、海洋乳酸菌が例示される。好ましくは、本態様において使用される乳酸菌は植物由来である。由来となる植物は特に限定されず、キャベツ、すぐき、大根、ニンジン、キュウリ等の野菜；パイナップル、柿等の果物；米、麦等の穀類；アロエ、サボテン等の多肉植物等が例示される。 The type of lactic acid bacteria used in this embodiment is not particularly limited, but is preferably a lactic acid bacterium of the genus Lactobacillus. Examples of preferred Lactobacillus lactic acid bacteria include Lactobacillus acidophilus, Lactobacillus brevis, Lactobacillus bukuneri, Lactobacillus bulgaricus, Lactobacillus casei, Lactobacillus delbulecki, Lactobacillus fermentum, Lactobacillus fermentum, Gasseri, Lactobacillus helveticus, Lactobacillus hirdardi, Lactobacillus johnsonii, Lactobacillus lake mani, Lactobacillus lactis, Lactobacillus paracasei, Lactobacillus plantarum, Lactobacillus rhamnosus, Lactobacillus reuteri, Lactobacillus・ Salivarius etc. may be mentioned. Further preferred examples are Lactobacillus paracasei and Lactobacillus fermentum. These lactic acid bacteria may be used alone or in combination of two or more. Further, the origin of the lactic acid bacteria is not particularly limited, and intestinal lactic acid bacteria, animal-derived lactic acid bacteria, plant-derived lactic acid bacteria, and marine lactic acid bacteria are exemplified. Preferably, the lactic acid bacteria used in this aspect are of plant origin. The plant from which it is derived is not particularly limited, and examples thereof include vegetables such as cabbage, Japanese radish, radish, carrot and cucumber; fruits such as pineapple and persimmon; grains such as rice and barley; and succulent plants such as aloe and cactus.
本態様において使用される乳酸菌は、ラクトバチルス属以外の菌を含んでもよいし、ラクトバチルス属の菌のみでもよい。また、発酵には乳酸菌のみを用いてもよいし、必要に応じて乳酸菌以外の菌を併用してもよい。 The lactic acid bacteria used in this embodiment may contain bacteria other than Lactobacillus, or may only be Lactobacillus bacteria. Moreover, only lactic acid bacteria may be used for fermentation, and you may use bacteria other than lactic acid bacteria together as needed.
本態様において使用される乳酸菌の入手方法は特に限定されず、市販品を利用してもよい。例えば、株式会社ダイワ、カネカ株式会社、セティ株式会社、東亜薬品工業株式会社、株式会社東洋新薬等から入手可能である。好ましくは、Ｖ−ＬＡＢ原液（株式会社ダイワ）の乳酸菌が利用できる。 The method for obtaining the lactic acid bacteria used in this embodiment is not particularly limited, and commercially available products may be used. For example, they can be obtained from Daiwa Co., Ltd., Kaneka Co., Ltd., Seti Co., Ltd., Toa Pharmaceutical Co., Ltd., Toyo Shinyaku Co., Ltd., and the like. Preferably, lactic acid bacteria of V-LAB stock solution (Daiwa Co., Ltd.) can be used.
本態様の除染剤の形態は特に限定されず、液状、ペースト状、粉状、顆粒状、固形状、ゲル状、シート状等が例示される。また、例えば、高分子材料のゲル状基質に加えて、よく分散させてから成形して固形剤としたり、多孔質物質に含浸または担持させたりしてもよい。多孔性物質としては、例えばゼオライト、多孔質シリカ、セルロース、湿熱処理デンプン、サイクロデキストリン、ポリウレタン発泡体、発泡ポリスチレン等が挙げられる。また、例えばエアゾールのような形態で用いてもよい。なお、乳酸菌自体の作用が期待されるため、乾燥させる場合は加熱を行わない、例えば凍結乾燥による、ことが好ましい。好ましくは、本態様の除染剤の形態は液状である。 The form of the decontamination agent of this embodiment is not particularly limited, and examples thereof include liquid, paste, powder, granules, solid, gel, and sheet. Also, for example, in addition to a gel-like matrix of a polymeric material, it may be well dispersed and then shaped into a solid agent, or it may be impregnated or carried in a porous substance. Examples of the porous material include zeolite, porous silica, cellulose, heat-moisture treated starch, cyclodextrin, polyurethane foam, expanded polystyrene and the like. Also, it may be used in the form of, for example, an aerosol. In addition, since the effect | action of lactic acid bacteria itself is anticipated, when making it dry, it is preferable not to heat, for example, lyophilization. Preferably, the form of the decontamination agent of this aspect is a liquid.
本発明の除染剤は、豆類の乳酸菌発酵物のみから調製されてもよい。場合により、豆類の乳酸菌発酵物には発酵の補助のための資化性糖類を含んでいてもよいし、含んでいなくてもよい。資化性糖類の例として、グルコース、フラクトース、スクロース、マルトース、ガラクトース、ラクトース、ラフィノース、トレハロース、大豆オリゴ糖、フラクトオリゴ糖、キシロオリゴ糖等が挙げられる。また、本態様の除染剤は、他の原料が添加されていてもよいし、添加されていなくてもよい。他の原料の例として、増粘剤、ゲル化剤、乳化剤、界面活性剤、キレート剤等が挙げられる。他の原料の添加量は特に限定されず、当業者が適宜調整できるが、本発明の除染剤の効果を妨げない限度であることが好ましい。 The decontamination agent of the present invention may be prepared only from legume lactic acid bacteria fermented material. In some cases, leguminous lactic acid bacteria fermented products may or may not contain assimilable sugars for supporting the fermentation. Examples of assimilable saccharides include glucose, fructose, sucrose, maltose, galactose, lactose, raffinose, trehalose, soybean oligosaccharide, fructooligosaccharide, xylooligosaccharide and the like. In addition, the decontamination agent of this embodiment may or may not have other raw materials added. Examples of other raw materials include thickeners, gelling agents, emulsifiers, surfactants, chelating agents and the like. The addition amount of the other raw materials is not particularly limited and can be appropriately adjusted by those skilled in the art, but it is preferable that the addition amount is such that the effect of the decontamination agent of the present invention is not impaired.
本態様の除染剤は、下記に詳述する製造方法によって製造してもよいし、市販品を利用してもよい。市販品の例として、Ｖ−ＬＡＢ原液（株式会社ダイワ）等が挙げられる。 The decontamination agent of this embodiment may be produced by the production method described in detail below, or a commercially available product may be used. Examples of commercially available products include V-LAB stock solution (Daiwa Co., Ltd.) and the like.
本態様の除染剤を使用する対象は特に限定されず、放射能に汚染された物質であればいずれのものであってもよい。例として、水田、畑等の土壌；海、川、浄水場等の水質；落葉堆肥、家畜堆肥等の堆肥；家畜飼料、稲藁、牧草サイレージ；高濃度汚染土壌、生ゴミまたは下水汚泥の燃焼灰；瓦礫、建築資材；家屋、屋根等の住宅周り；公園緑地、砂場、花壇；里山雑木林、山林；原子力発電所現場及びその敷地が挙げられる。 The subject in which the decontamination agent of this aspect is used is not particularly limited, and any substance contaminated with radioactivity may be used. For example, soils such as paddy fields and fields; water quality such as seas, rivers and water purification plants; composts such as fallen leaves composts and livestock composts; livestock feed, rice straw and grass silage; high concentration contaminated soils, burning garbage or sewage sludge Ashes; rubble, building materials; houses, houses, roofs, etc .; parks, sand fields, flower beds; satoyama mixed forests, mountain forests; nuclear power plant sites and their sites.
本態様の除染剤を放射能汚染物質に添加することで、対象となる放射能汚染物質を除染することができる。添加の態様は特に限定されず、噴霧器や散布機、ジョウロ等による散布、浸漬等が例示される。 By adding the decontamination agent of this embodiment to a radioactive contaminant, the target radioactive contaminant can be decontaminated. The mode of addition is not particularly limited, and examples thereof include spraying with a sprayer, a sprayer, spreading by Jouro, immersion, and the like.
本態様の除染剤の添加量は特に限定されず、利用者が適宜調整できる。好ましい添加量の例として、水田、畑、公園、緑地または花壇等の土壌に対しては、１０ａ当たり、有効成分である液状の発酵物として２５〜２０００Ｌ、３０〜１５００Ｌ、５０〜１０００Ｌ、１００〜５００Ｌ等が挙げられる。また、掘削した土壌、瓦礫、稲藁、焼却灰、堆肥、落葉、剪定チップ等に対しては、対象物１ｋｇ当たり、液状の発酵物として、２０ｍｌ〜１０Ｌ、５０ｍｌ〜５Ｌ、１００ｍｌ〜４Ｌ、１５０ｍｌ〜３Ｌ、２００ｍｌ〜２Ｌ等が挙げられる。 The addition amount of the decontamination agent of the present embodiment is not particularly limited, and can be appropriately adjusted by the user. As an example of a preferable addition amount, it is 25-2000L, 30-1500L, 50-1000L, 100- per 10a with respect to soils, such as a paddy field, a field, a park, a green space or a flower bed, as a liquid fermented substance which is an active ingredient. 500 L etc. are mentioned. Also, for excavated soil, rubble, rice straw, incinerator ash, compost, fallen leaves, pruning chips, etc., 20 ml to 10 L, 50 ml to 5 L, 100 ml to 4 L, 150 ml of liquid fermented material per 1 kg of the object. -3 L, 200 ml-2 L etc. are mentioned.
本発明は、他の態様において、豆類の乳酸菌発酵物を有効成分として含む、放射能汚染の除染剤の製造方法を提供する。 The present invention provides, in another aspect, a method for producing a radioactively contaminated decontamination agent, which comprises a fermented product of leguminous lactic acid bacteria as an active ingredient.
本態様の方法において使用される豆類、乳酸菌についての説明は上述のとおりである。 The description of the beans and lactic acid bacteria used in the method of this embodiment is as described above.
本態様の方法では、豆類の溶液またはスラリーを調製する。スラリーを得る方法の１つの例として、原料の豆類に水または温水を加えて１０〜３０時間浸漬した後、グラインダー等で粉砕する方法が挙げられる。この際、粉砕する前に液体部分を分離して、粉砕後に再度液体部分を混合してもよい。他の例として、パルベライザー等で粉砕した豆類を水または温水に分散する方法が挙げられる。豆類の殺菌、酵素失活のために、浸漬段階および／またはスラリーの段階で加熱処理を行うことが好ましい。加熱処理の条件は特に限定されず、当業者が適宜調整できる。具体例として、例えば９０〜１２０℃、１〜５時間で行うことができる。 In the method of this embodiment, a solution or slurry of legumes is prepared. As an example of the method of obtaining a slurry, after adding water or warm water to beans of a raw material and soaking for 10 to 30 hours, the method of grind | pulverizing with a grinder etc. is mentioned. At this time, the liquid portion may be separated before grinding, and the liquid portion may be mixed again after grinding. Another example is a method of dispersing beans ground with a pulperizer or the like in water or warm water. It is preferable to carry out heat treatment at the stage of immersion and / or slurry for pasteurization of beans and enzyme inactivation. The conditions of the heat treatment are not particularly limited, and can be appropriately adjusted by those skilled in the art. As a specific example, it can carry out, for example at 90-120 ° C and 1-5 hours.
本態様の方法における、乳酸菌の添加量、発酵温度、発酵時間等の発酵条件は特に限定されず、当業者が適宜調整できる。具体例として、例えば１０〜５０℃で３〜１４４時間、１５〜４５℃で２４〜１２０時間、２０〜４０℃で４８〜９６時間等が挙げられる。発酵の前に、乳酸菌の栄養源として、必要に応じて資化性糖類を加えてもよい。資化性糖類の例は、上述のとおりである。資化性糖類の添加量は特に限定されず、当業者が適宜調整できる。例えば、大豆スラリーに対して１〜２０重量％、５〜１０重量％等が挙げられる。また、資化性糖類を加えなくてもよい。 Fermentation conditions such as the added amount of lactic acid bacteria, fermentation temperature, fermentation time and the like in the method of the present embodiment are not particularly limited, and can be appropriately adjusted by those skilled in the art. Specific examples thereof include, for example, 10 to 50 ° C. for 3 to 144 hours, 15 to 45 ° C. for 24 to 120 hours, and 20 to 40 ° C. for 48 to 96 hours. Before fermentation, assimilable saccharides may be added as necessary as a nutrient source of lactic acid bacteria. Examples of assimilable sugars are as described above. The addition amount of assimilable saccharides is not particularly limited, and can be appropriately adjusted by those skilled in the art. For example, 1 to 20% by weight, 5 to 10% by weight, etc. of soybean slurry can be mentioned. Also, it is not necessary to add assimilable saccharides.
本態様の方法において、得られた発酵物は、そのまま本発明の除染剤として用いてもよい。また、希釈、濃縮、乾燥等を行ってもよい。乾燥させる場合は加熱を行わない、例えば凍結乾燥による、ことが好ましい。 In the method of the present embodiment, the obtained fermented product may be used as it is as the decontamination agent of the present invention. In addition, dilution, concentration, drying and the like may be performed. In the case of drying, it is preferable that heating is not performed, for example, by lyophilization.
本態様の方法において、豆類、乳酸菌、資化性糖類以外に、上述した他の原料を添加してもよいし、しなくてもよい。添加量、添加のタイミングは当業者が適宜調整できる。 In the method of the present embodiment, the above-mentioned other raw materials may or may not be added in addition to the beans, the lactic acid bacteria and the assimilable saccharides. The amount of addition and the timing of addition can be appropriately adjusted by those skilled in the art.
得られた発酵物をそのまま用いる場合は、速やかに冷却することが好ましい。冷却温度は、１０℃以下、例えば−２〜１０℃が挙げられる。本態様の方法において得られた除染剤は、冷蔵保存することが好ましい。 When using the obtained fermented product as it is, it is preferable to cool rapidly. The cooling temperature may be 10 ° C. or less, for example, −2 to 10 ° C. The decontamination agent obtained in the method of this embodiment is preferably stored under refrigeration.
本発明は、さらに他の態様において、本発明の除染剤を用いる放射能汚染の除染方法を提供する。本発明の除染剤、除染対象、添加量等の詳細は上述のとおりである。 In still another aspect, the present invention provides a method of decontaminating radioactive contamination using the decontamination agent of the present invention. The details of the decontamination agent of the present invention, the decontamination target, the addition amount and the like are as described above.
以下、実施例により本発明の実施形態についてより具体的に記載する。 Hereinafter, the embodiments of the present invention will be more specifically described by examples.
実施例１：本発明の除染剤の調製
丸大豆に、重量基準で１０倍量の水を添加し、１５時間浸漬した後、１００℃で３時間煮沸した。これを固液分離した後、固体部分をミキサーで粉砕し、液体部分と混合してスラリーとした。このスラリーを１００℃で２時間煮沸した後、３５℃に冷却し、植物由来のラクトバチルス・パラカゼイ、ラクトバチルス・ファーメンタムを混合したものを添加し、３５℃で３〜４日間発酵し、大豆乳酸菌発酵物を得た。得られた発酵物は、１０℃に冷却し、冷蔵保管し、そのまま本発明の除染剤として各種テストに供した。
Example 1: Preparation of the decontamination agent of the present invention Ten times amount of water was added to whole soybeans on a weight basis, and after soaking for 15 hours, it was boiled at 100 ° C for 3 hours. After solid-liquid separation, the solid part was crushed by a mixer and mixed with the liquid part to form a slurry. The slurry is boiled at 100 ° C. for 2 hours, cooled to 35 ° C., mixed with plant-derived Lactobacillus paracasei and Lactobacillus fermentum, and fermented at 35 ° C. for 3 to 4 days, soybean Lactic acid bacteria fermented material was obtained. The obtained fermented product was cooled to 10 ° C., stored under refrigeration, and subjected to various tests as a decontamination agent of the present invention as it was.
実施例２：土壌の除染テスト１
２０１４年１１月に福島県双葉郡浪江町で採集した汚染土壌３００ｇに対して、実施例１で調製した除染剤１００ｍｌを添加し、室温で保管して、時間の経過と共に放射線量を測定した。測定は、γ線用シンチレーションサーベイメータＴＣＳ−１７２Ｂ（日立製作所）を用いた。採集地点の異なる土壌４種類で検討を行った。結果を図１に示す。
Example 2:
100 ml of the decontamination agent prepared in Example 1 was added to 300 g of contaminated soil collected in Namie-cho, Futaba-gun, Fukushima Prefecture in November 2014, stored at room temperature, and the radiation dose was measured over time . The measurement used the scintillation survey meter TCS-172B (Hitachi, Ltd.) for gamma rays. The study was conducted on four types of soil with different collection points. The results are shown in FIG.
図１に示すように、いずれの試料も本発明の除染剤による処理で線量が低下していた。なお、Ｂの試料は１６日時点ではまだ１．９８１μＳｖ／ｈを示していたが、２５日経過後は０．７２３μＳｖ／ｈまで低下していた。 As shown in FIG. 1, the dose of all the samples was reduced by the treatment with the decontamination agent of the present invention. The B sample still showed 1.981 μSv / h at the 16th day, but had dropped to 0.723 μSv / h after the 25th day.
実施例３：稲藁灰の除染テスト
放射能汚染稲藁の灰に実施例１で調製した除染剤を添加し、３０時間反応させた。反応前後の放射線量をＴＣＳ−１７２Ｂで測定した。添加前は１．１０μＳｖ／ｈであったところ、反応後は０．１０μＳｖ／ｈに減少した。
Example 3 Decontamination Test of Rice Straw Ash The decontamination agent prepared in Example 1 was added to the ash of radioactively contaminated rice straw and allowed to react for 30 hours. The radiation dose before and after the reaction was measured by TCS-172B. It was 1.10 μSv / h before the addition, but decreased to 0.10 μSv / h after the reaction.
実施例４：土壌の除染テスト２
２０１６年１０月に、福島県川内村で汚染土壌を採取した。一方は未処理、もう一方は土壌３００ｇに対して実施例１で調製した除染剤１００ｍｌを添加して、６ヶ月間室温保存した後、放射性セシウム量を測定した。測定はゲルマニウム半導体検出器ＧＥＭ２０−７０（オルテック）を用いた。結果を表１に示す。
Example 4: Soil Decontamination Test 2
In October 2016, we collected contaminated soil in Kawauchi Village, Fukushima Prefecture. One was untreated, and the other was 100 g of the decontamination agent prepared in Example 1 with respect to 300 g of soil, stored at room temperature for 6 months, and then the amount of radioactive cesium was measured. The measurement used germanium semiconductor detector GEM20-70 (Ortec). The results are shown in Table 1.
表１に示すとおり、処理品は未処理品と比較してセシウム−１３４、セシウム−１３７のいずれも約７０％の減少が見られた。本発明の除染剤がセシウムを有効に除染できることが示された。 As shown in Table 1, the treated product showed a decrease of about 70% for both cesium-134 and cesium-137 as compared with the untreated product. It has been shown that the decontamination agent of the present invention can effectively decontaminate cesium.
本発明は、放射能汚染を有効に除染できる除染剤、その製造方法、および本発明の除染剤を用いた除染方法を提供する。本発明は、汚染土壌、汚染水等を有効に除染できる、極めて有用なものである。 The present invention provides a decontamination agent capable of effectively decontaminating radioactive contamination, a method for producing the same, and a decontamination method using the decontamination agent of the present invention. The present invention is extremely useful which can effectively decontaminate contaminated soil, contaminated water and the like.
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