JP2012242254A - Original position purification method of contaminated soil - Google Patents
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本発明は、汚染土壌を効率良く浄化する方法に関する。 The present invention relates to a method for efficiently purifying contaminated soil.
平成２３年３月１１日、東北太平洋沖地震に伴い、東京電力福島第一原子力発電所において事故が発生し、周辺環境中に放射性物質が放出された。
周辺の農産物等からも放射性物質が検出されたことから、食品衛生法に基づく飲食物に関する暫定規制値が定められた。すなわち、暫定規制値として、飲料水及び牛乳・乳製品については、放射性ヨウ素３００Bq/kg、放射性セシウム２００Bq/kg；野菜類については、放射性ヨウ素２０００Bq/kg、放射性セシウム５００Bq/kg；穀類については、放射性セシウム５００Bq/kg、などが定められ、これらの規制値を上回る食品について、食用に供されることがないよう、販売その他についての措置がなされた。
On March 11, 2011, an accident occurred at TEPCO's Fukushima Daiichi NPS following the Tohoku-Pacific Ocean Earthquake, and radioactive materials were released into the surrounding environment.
Since radioactive substances were also detected in nearby agricultural products, provisional regulatory values for food and drink based on the Food Sanitation Law were established. That is, as provisional regulation values, for drinking water and milk / dairy products, radioactive iodine 300Bq / kg, radioactive cesium 200Bq / kg; for vegetables, radioactive iodine 2000Bq / kg, radioactive cesium 500Bq / kg; Radioactive cesium 500Bq / kg, etc. was established, and sales and other measures were taken so that foods exceeding these regulatory values were not used for food.
一方、放射性物質で汚染された土壌で農作物を栽培した場合には、作物への放射性物質の移行が懸念される。例えば、水田土壌から玄米への放射性セシウムの移行の指標は０．１とされ、この指標を前提とした場合、玄米中の放射性セシウム濃度が、上記食品衛生法上の暫定基準値（５００Bq/Kg）以下となる土壌中の放射性セシウム濃度の上限値は、５０００Bq/Kgとなる。
このため、放射性物質で汚染された土壌の浄化対策が必要となり、効率の良い浄化方法が求められている。
On the other hand, when crops are cultivated in soil contaminated with radioactive substances, there is concern about the transfer of radioactive substances to the crops. For example, the index of radiocesium migration from paddy soil to brown rice is set to 0.1. If this index is assumed, the concentration of radioactive cesium in brown rice is the provisional standard value (500 Bq / Kg in the Food Sanitation Law). ) The upper limit of the concentration of radioactive cesium in the soil is 5000 Bq / Kg.
For this reason, it is necessary to take measures for purification of soil contaminated with radioactive substances, and an efficient purification method is required.
従来、放射性物質で汚染された土壌の浄化方法として、例えば、有害物で汚染された土壌の中にパイプを埋入して、高温過熱水蒸気を噴射し、該土壌中の汚染物質を加熱分解又は揮発させることにより、除去する方法（特許文献１）が知られている。しかしながら、当該方法は、主に、有機溶剤等の揮発性物質を対象としたものであり、放射性物質については、具体的に示されていない。
また、特許文献２には、放射性廃棄物を超臨界二酸化炭素に接触させ、放射性廃棄物に含まれる放射性元素を超臨界二酸化炭素に移行させて放射性元素含有超臨界二酸化炭素を生成させ、これを水と接触させて放射性元素を水に移行させる放射性廃棄物の処理方法が記載されている。しかしながら、この方法では、膨大な設備が必要となり、実用的なものではない。
Conventionally, as a method for purifying soil contaminated with radioactive substances, for example, a pipe is embedded in soil contaminated with harmful substances, high-temperature superheated steam is injected, and the contaminants in the soil are thermally decomposed or decomposed. A method (Patent Document 1) for removing by volatilization is known. However, this method is mainly intended for volatile substances such as organic solvents, and the radioactive substances are not specifically shown.
Further, in Patent Document 2, the radioactive waste is brought into contact with supercritical carbon dioxide, and the radioactive element contained in the radioactive waste is transferred to supercritical carbon dioxide to generate radioactive element-containing supercritical carbon dioxide. A method for treating radioactive waste is described in which radioactive elements are transferred to water by contact with water. However, this method requires a huge amount of equipment and is not practical.
従って、本発明の目的は、放射性物質で汚染された土壌を効率良く浄化する方法を提供することにある。 Accordingly, an object of the present invention is to provide a method for efficiently purifying soil contaminated with radioactive substances.
本発明者らは、斯かる実情に鑑み、種々検討した結果、鉄塩、アンモニウム塩、カリウム塩等の特定の薬剤を用いて土壌中の放射性物質を抽出洗浄すれば、土壌を効率良く浄化できることを見出し、本発明を完成した。 As a result of various studies in view of such circumstances, the present inventors can efficiently purify the soil by extracting and washing radioactive substances in the soil using specific agents such as iron salts, ammonium salts, and potassium salts. The present invention has been completed.
すなわち、本発明は、塩化第一鉄、塩化第二鉄、硫酸第一鉄、硫酸第二鉄、硝酸第一鉄、硝酸第二鉄及びポリ硫酸鉄から選ばれる鉄塩、並びにアンモニウム塩、カリウム塩から選ばれる薬剤を、放射性物質汚染土壌に施用し、土壌中の放射性物質を抽出洗浄することを特徴とする放射性物質汚染土壌の浄化方法を提供するものである。 That is, the present invention relates to an iron salt selected from ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, ferrous nitrate, ferric nitrate and polyiron sulfate, as well as ammonium salt and potassium. The present invention provides a method for purifying radioactive material-contaminated soil, which comprises applying a chemical selected from salt to radioactive material-contaminated soil and extracting and cleaning the radioactive material in the soil.
本発明によれば、放射性物質汚染土壌を効率良く浄化することができる。 According to the present invention, radioactive substance-contaminated soil can be purified efficiently.
本発明で浄化対象となる汚染土壌としては、市街地、山林、工場跡地、農用地（畑、水田）、沼地、更には排土等で、放射性物質を含有する土壌が挙げられる。
放射性物質としては、ヨウ素１３１、放射性セシウム（セシウム１３４、１３７）、ストロンチウム９０、ウラン、プルトニウム等が挙げられる。
本発明の方法は、特に、放射性セシウム含有水田土壌の浄化に好適である。
Examples of the contaminated soil to be purified in the present invention include urban areas, mountain forests, factory sites, agricultural land (fields, paddy fields), marshes, and soils containing radioactive substances.
Examples of the radioactive substance include iodine 131, radioactive cesium (cesium 134, 137), strontium 90, uranium, and plutonium.
The method of the present invention is particularly suitable for the purification of paddy soil containing radioactive cesium.
本発明で用いる薬剤は、塩化第一鉄、塩化第二鉄、硫酸第一鉄、硫酸第二鉄、硝酸第一鉄、硝酸第二鉄、ポリ硫酸鉄から選ばれる鉄塩、並びにアンモニウム塩、カリウム塩から選ばれるものである。アンモニウム塩としては、塩化アンモニウム、硝酸アンモニウム、硫酸アンモニウム等が挙げられる。カリウム塩としては、塩化カリウム、硝酸カリウム、硫酸カリウム等が挙げられる。本発明においては、これらを２種以上併用しても良い。 The agent used in the present invention is ferric chloride, ferric chloride, ferrous sulfate, ferric sulfate, ferrous nitrate, ferric nitrate, iron salt selected from polyiron sulfate, and ammonium salt, It is selected from potassium salts. Examples of the ammonium salt include ammonium chloride, ammonium nitrate, ammonium sulfate and the like. Examples of the potassium salt include potassium chloride, potassium nitrate, and potassium sulfate. In the present invention, two or more of these may be used in combination.
上記鉄塩は、例えば下式のように、加水分解により水酸イオンを配位して鉄水酸化物（Ｆｅ(ＯＨ)n）を生成する。本発明においては、生成する鉄水酸化物の溶解度積が１０-10未満、特に１０-15未満である鉄塩を用いるのが、水酸イオンの配位するｐＨが低くなり、放射性物質の除去効果が向上するので好ましい。特に、塩化第二鉄は、生成する鉄の水酸化物Ｆｅ（ＯＨ）3の沈殿生成ｐＨが２．３以上と低く、更に生成した沈殿の溶解度積が１０-33と低いので好ましい。
ＦｅＸn ＋ ｎＨ2Ｏ → Ｆｅ(ＯＨ)n ＋ ｎＸ- ＋ ｎＨ+
（式中、Ｘは１価の陰イオンを示し、ｎは鉄イオンの価数を示す）
The iron salt generates iron hydroxide (Fe (OH) n ) by coordinating hydroxide ions by hydrolysis, for example, as shown in the following formula. In the present invention, the use of an iron salt having a solubility product of the produced iron hydroxide of less than 10 −10 , particularly less than 10 −15 , lowers the pH coordinated with hydroxide ions, and removes radioactive substances. Since an effect improves, it is preferable. In particular, ferric chloride is preferable because the precipitation pH of the iron hydroxide Fe (OH) 3 produced is as low as 2.3 or more, and the solubility product of the produced precipitate is as low as 10 −33 .
FeX n + nH 2 O → Fe (OH) n + nX − + nH +
(Wherein X represents a monovalent anion and n represents the valence of an iron ion)
また、背景技術で記載したように、放射性セシウムについて、農用地土壌の放射性物質濃度の基準値が設けられている。放射性セシウムは土壌中で１価の陽イオンとして、カリウムなどと同様に挙動する。すなわち、１価の陽イオンである放射性セシウムは、表面が負に帯電している土壌粒子と静電的に吸着される。また、スメクタイト、バーミキュライトなど２：１型層状ケイ酸塩と呼ばれる粘土鉱物の層間の負電荷がある場所は、セシウムイオン、アンモニウムイオン、カリウムイオンを閉じ込めるのにちょうど良い大きさを持つことから、より強く吸着されると言われている。
本発明では、放射性セシウムイオンと同様な挙動を示すアンモニウムイオン、カリウムイオンを用いることによって、土壌粒子に固定された放射性セシウムを抽出できることを見出した。土壌中に含まれる放射性物質濃度は、セシウム１３７の放射能量が５０００Bq/kgの場合、物質濃度としては約１．６ng/kgと極めて微量である。同様な挙動を示すアンモニウムイオン、カリウムイオンを放射性物質に対して高い濃度で添加することで、土壌に吸着したセシウム１３７が置換され、土壌中のセシウム１３７濃度の低減が可能となる。
グリセリンやエチレングリコールモノエチルエーテル（ＥＧＭＥ）は、上述の粘土鉱物の層間に侵入することで、抽出薬剤の効果を高めることができる。
In addition, as described in the background art, for radioactive cesium, a reference value of the radioactive substance concentration of agricultural land soil is provided. Radioactive cesium behaves in the same way as potassium as a monovalent cation in soil. That is, radioactive cesium that is a monovalent cation is electrostatically adsorbed to soil particles whose surface is negatively charged. Also, the place where there is a negative charge between the layers of clay minerals called 2: 1 type layered silicates such as smectite, vermiculite, etc., has the right size to confine cesium ions, ammonium ions, potassium ions, so more It is said to be strongly adsorbed.
In this invention, it discovered that the radioactive cesium fixed to the soil particle was extractable by using the ammonium ion and potassium ion which show the behavior similar to a radioactive cesium ion. The concentration of the radioactive substance contained in the soil is as extremely small as about 1.6 ng / kg as the substance concentration when the radioactivity of cesium 137 is 5000 Bq / kg. By adding ammonium ions and potassium ions exhibiting similar behavior at high concentrations to the radioactive substance, cesium 137 adsorbed on the soil is replaced, and the concentration of cesium 137 in the soil can be reduced.
Glycerin and ethylene glycol monoethyl ether (EGME) can enhance the effect of the extraction drug by entering between the above-mentioned clay mineral layers.
上記薬剤を、放射性物質汚染土壌に施用する際には、水溶液として用いるのが好ましく、その濃度は、鉄塩の場合、１〜２００mM、特に３〜１００mMであるのが、放射性物質の除去効果が大きいとともに、土壌への残留が少ないので好ましい。また、アンモニウム塩、カリウム塩の場合は、０．１〜４Ｍ、特に０．５Ｍ〜２Ｍであるのが、放射性物質の除去効果が大きいとともに、土壌への残留が少ないので好ましい。 When the agent is applied to radioactive material-contaminated soil, it is preferably used as an aqueous solution. In the case of an iron salt, the concentration is 1 to 200 mM, particularly 3 to 100 mM. It is preferable because it is large and has little residue on the soil. Moreover, in the case of ammonium salt and potassium salt, it is preferable that it is 0.1-4M, especially 0.5M-2M, since the removal effect of a radioactive substance is large and the residue to soil is few.
本発明においては、薬剤、特に薬剤水溶液に、塩化セシウム（放射性ではないもの）を添加することにより、放射性物質の抽出効果を高めることが可能である。薬剤水溶液中の塩化セシウム濃度は５〜５０ｍＭ、特に１０〜３０ｍＭが好ましい。
また、薬剤、特に薬剤水溶液に、グリセリン又はエチレングリコールモノエチルエーテル（ＥＧＭＥ）を添加することにより、放射性物質の抽出効果をより高めることが可能である。薬剤水溶液中のグリセリン又はエチレングリコールモノエチルエーテル（ＥＧＭＥ）濃度は、０．１〜４Ｍ、特に０．５〜２Ｍであるのが、コストの低減、水洗回数の低減、洗浄廃液処理の負荷低減の点で好ましい。ここで、グリセリン及びＥＧＭＥを組みあわせて用いることもできる。
In the present invention, the extraction effect of the radioactive substance can be enhanced by adding cesium chloride (non-radioactive) to the drug, particularly the drug aqueous solution. The concentration of cesium chloride in the aqueous drug solution is preferably 5 to 50 mM, particularly preferably 10 to 30 mM.
Moreover, the extraction effect of a radioactive substance can be further enhanced by adding glycerin or ethylene glycol monoethyl ether (EGME) to a drug, particularly a drug aqueous solution. The concentration of glycerin or ethylene glycol monoethyl ether (EGME) in the aqueous chemical solution is 0.1 to 4M, particularly 0.5 to 2M. This reduces costs, reduces the number of washings, and reduces the waste treatment waste treatment load. This is preferable. Here, glycerin and EGME can also be used in combination.
このような水溶液を用いて土壌中の放射性物質を抽出洗浄する方法としては、特に制限されず、現場にて洗浄する方法、土壌を掘削して洗浄した後、浄化土壌を埋め戻す方法等のいずれでも良い。特に、現場（原位置）での土壌洗浄が好ましい。 The method for extracting and cleaning radioactive substances in soil using such an aqueous solution is not particularly limited, and any of a method for cleaning on-site, a method for excavating and cleaning the soil, and then refilling the purified soil, etc. But it ’s okay. In particular, soil cleaning at the site (in situ) is preferable.
また、本発明において、抽出洗浄するとは、土壌と薬剤水溶液を直接混合する以外に、土壌に薬剤と水を別々に加えて混合して洗浄する方法、水を含む土壌に薬剤を混合して洗浄する方法も含まれる。
水を含む土壌を洗浄する方法の一例としては、河川や湖沼の底土を水とともに浚渫し、ミキサーに投入して、薬剤粉末を所定濃度になるよう添加して混合する方法が挙げられる。
Further, in the present invention, extraction washing means not only mixing the soil and the chemical aqueous solution directly, but also a method of adding the chemical and water separately to the soil and washing them by mixing, and washing the soil containing water by mixing the chemicals. The method of doing is also included.
As an example of a method for washing soil containing water, there is a method in which bottom soil of rivers and lakes is dredged with water, put into a mixer, and drug powder is added to a predetermined concentration and mixed.
抽出洗浄に用いる水溶液の量は、浄化対象土壌の１〜５質量倍、特に１〜２．５質量倍であるのが好ましい。
このように処理することにより、土壌中の放射性物質は水溶液中に抽出される。
The amount of the aqueous solution used for the extraction washing is preferably 1 to 5 times by mass, particularly 1 to 2.5 times by mass of the soil to be purified.
By treating in this way, radioactive substances in the soil are extracted into an aqueous solution.
放射性物質を抽出した水溶液は、自然沈降又は積極的な脱水などにより固液分離し、土壌から分離除去し、後記の廃液処理により無毒化される。 The aqueous solution from which the radioactive material has been extracted is solid-liquid separated by natural sedimentation or aggressive dehydration, separated and removed from the soil, and detoxified by waste liquid treatment described later.
一方、処理された土壌には、用いた水溶液中の薬剤の一部が残存する場合や、洗浄により抽出された放射性物質の一部が残存する場合があるため、更に土壌を水で洗浄することにより、これらを除去するのが好ましい。
水による洗浄は、水溶液による洗浄と同様に行えば良く、土壌中の放射性物質の濃度、及び水溶液洗浄で用いた薬剤の残留量が土壌環境基準以下になるまで繰り返し行うのが好ましく、少なくとも１回、特に１〜６回、水で洗浄するのが好ましい。
On the other hand, in the treated soil, some of the chemicals in the used aqueous solution may remain, or some of the radioactive substances extracted by washing may remain, so the soil should be further washed with water. It is preferable to remove these.
Washing with water may be carried out in the same manner as washing with an aqueous solution, and it is preferably repeated at least once until the concentration of radioactive substances in the soil and the residual amount of the chemical used in the aqueous solution washing are below the soil environmental standards. In particular, it is preferable to wash with water 1 to 6 times.
原位置で、水溶液を用いて土壌洗浄する場合には、例えば、タンクを用いて薬剤を水に溶解し、所定の濃度になるよう混合した後施用できるほか、所定濃度より高濃度の溶液を調製して施用した後、所定濃度になるように水を加えても良く、更に、予め湛水した水田に施用しても良い。また、導水時に連続的に薬剤を投入できる装置により施用しても良い。 When soil is washed in-situ with an aqueous solution, for example, the drug can be dissolved in water using a tank, mixed to a predetermined concentration and then applied, and a solution with a concentration higher than the predetermined concentration is prepared. After application, water may be added so as to have a predetermined concentration, or it may be applied to a previously padded paddy field. Moreover, you may apply with the apparatus which can throw in a chemical | medical agent continuously at the time of water conveyance.
また、薬剤と水を別々に加えて土壌洗浄することもでき、この場合、例えば、薬剤の施用には肥料撒布機などを用いることができ、耕耘機等を用いて土壌を耕耘するとともに、薬剤と土壌を攪拌、混合することができる。水は、通常水田に導水する方法により、決定した固液比に相当する量を入れ、次に、ロータリーハローなどを用いて代掻きの要領で洗浄作業を行うことができる。 Also, the soil can be washed by separately adding the chemical and water. In this case, for example, a fertilizer spreading machine can be used for applying the chemical, and the soil is cultivated using a tiller or the like. And the soil can be stirred and mixed. Water is usually introduced into a paddy field by an amount corresponding to the determined solid-liquid ratio, and then a cleaning operation can be performed in the manner of scraping using a rotary harrow or the like.
洗浄により、土壌中の放射性物質を水溶液中に抽出させた後、原位置にて土壌を沈降させて上澄廃液を集める。水田土壌を浄化する場合、上澄廃液は、通常水田で落水する時開く排水口を開けて排水し、一時的にピットに貯留し、その後ポンプで廃水処理設備に入れても良いし、そのままポンプで水田から排水しても良い。 After washing, radioactive materials in the soil are extracted into an aqueous solution, and then the soil is settled in situ to collect the supernatant waste liquid. When purifying paddy soil, the supernatant waste liquid is usually drained by opening the drain opening that is opened when falling in the paddy field, temporarily stored in the pit, and then pumped into the wastewater treatment facility or pumped as it is You can drain from the paddy field.
排出された洗浄排水は、貯槽に貯められ、排水処理装置にて、アルカリ沈殿処理することにより、固液分離機にて固液分離後、上澄み液を中和し、浮遊物をバックフィルターで取り除いた後、放水される。放流水中の放射性物質を完全に除去するために、さらに放射性物質用の吸着材を充填したろ過装置を通す方式も選定できる。沈殿物はフィルタープレス等で脱水し、放射性産業廃棄物等として適切に処分する。 The discharged washing wastewater is stored in a storage tank and subjected to alkaline precipitation treatment with a wastewater treatment device. After solid-liquid separation with a solid-liquid separator, the supernatant liquid is neutralized and suspended matter is removed with a back filter. After that, it is discharged. In order to completely remove radioactive substances in the discharge water, a method of passing through a filtration device filled with an adsorbent for radioactive substances can also be selected. Deposits should be dehydrated with a filter press and disposed of as radioactive industrial waste.
次に、実施例を挙げて本発明をさらに詳細に説明するが、本発明はこれらに何ら制限されるものではない。 EXAMPLES Next, although an Example is given and this invention is demonstrated further in detail, this invention is not restrict | limited to these at all.
実施例１
放射性セシウム含有土壌Ａ（Ａ県畑地から採取した黒ぼく土、放射性セシウム濃度２５０００Bq/kg）を、５０mLの遠沈管に５ｇ秤量し、土壌重量に対して２．５質量倍の薬剤水溶液を添加し、１分間振とう後、１０分間静置、更に１分間振とう後、１０分間静置して土壌を沈降させて固液分離し、上澄み液を取除いた。薬剤は塩化第二鉄、塩化アンモニウムおよび塩化カリウムを用い、薬剤濃度は表１記載の濃度とした。
除去した上澄み液と同量の水を遠沈管に加え、１分間振とう後、静置して土壌を沈降させて上澄み液を除去した。この操作をさらに２回繰り返した。
処理土壌中の放射性セシウム濃度は「緊急時における食品の放射能測定マニュアル」（平成１４年３月厚生労働省医薬局食品保険部監視安全課）に従って測定し、放射性セシウム除去率（％）を求めた。結果を表１に示す。
Example 1
Weigh 5 g of radioactive cesium-containing soil A (black soil collected from the field in A prefecture, radioactive cesium concentration 25000 Bq / kg) into a 50 mL centrifuge tube, and add 2.5 mass times the chemical aqueous solution to the soil weight. After shaking for 1 minute, allowed to stand for 10 minutes, and further shaken for 1 minute, then allowed to stand for 10 minutes to allow the soil to settle, solid-liquid separate, and remove the supernatant. The drugs used were ferric chloride, ammonium chloride and potassium chloride, and the drug concentrations were as shown in Table 1.
The same amount of water as the removed supernatant was added to the centrifuge tube, shaken for 1 minute, and then allowed to stand to settle the soil to remove the supernatant. This operation was repeated two more times.
The concentration of radioactive cesium in the treated soil was measured according to the “Manual for Measuring Radioactivity of Food in Emergency” (March 2002 Ministry of Health, Labor and Welfare, Pharmaceutical Bureau, Food Insurance Department, Monitoring and Safety Division), and the radiocesium removal rate (%) was obtained. . The results are shown in Table 1.
実施例２
実施例１において、放射性セシウム含有土壌Ｂ（Ｂ県畑地から採取した黒ぼく土、放射性セシウム濃度４５００Bq/kg）を用い、洗浄薬剤は１．０Ｍ塩化アンモニウム、又は１．０Ｍ塩化アンモニウムに２０ｍＭ塩化セシウムを添加したものを用い、同様の処理を行った。結果を表２に示す。
Example 2
In Example 1, using radioactive cesium-containing soil B (black soil collected from the field of prefecture B, radioactive cesium concentration 4500 Bq / kg), the cleaning agent is 1.0 M ammonium chloride, or 20 mM cesium chloride in 1.0 M ammonium chloride. The same treatment was performed using a material to which was added. The results are shown in Table 2.
実施例３
実施例２において、表３に示す薬剤を用いる以外は、同様の処理を行った。結果を表３に示す。
Example 3
In Example 2, the same treatment was performed except that the drugs shown in Table 3 were used. The results are shown in Table 3.
Claims (6)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014032110A (en) * | 2012-08-03 | 2014-02-20 | Dowa Eco-System Co Ltd | Pretreatment method for removing cesium from soil and method for removing cesium |
| JP2014100700A (en) * | 2012-10-23 | 2014-06-05 | Okuto:Kk | Method for decontaminating contaminated soil |
| WO2014115267A1 (en) * | 2013-01-23 | 2014-07-31 | Hagiwara Nobuko | Device for removing radioactive substance using high-concentration ozonized water, and method for removing radioactive substance |
| JP2014238293A (en) * | 2013-06-06 | 2014-12-18 | 株式会社ネオス | Radioactive contaminant cleaning agent and cleaning method for radioactive contaminant |
| JP2015036406A (en) * | 2013-08-14 | 2015-02-23 | 株式会社ネオス | Radioactivity-contaminated soil, contaminated silt cleaning agent and cleaning method using the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014032110A (en) * | 2012-08-03 | 2014-02-20 | Dowa Eco-System Co Ltd | Pretreatment method for removing cesium from soil and method for removing cesium |
| JP2014100700A (en) * | 2012-10-23 | 2014-06-05 | Okuto:Kk | Method for decontaminating contaminated soil |
| WO2014115267A1 (en) * | 2013-01-23 | 2014-07-31 | Hagiwara Nobuko | Device for removing radioactive substance using high-concentration ozonized water, and method for removing radioactive substance |
| JP2014238293A (en) * | 2013-06-06 | 2014-12-18 | 株式会社ネオス | Radioactive contaminant cleaning agent and cleaning method for radioactive contaminant |
| JP2015036406A (en) * | 2013-08-14 | 2015-02-23 | 株式会社ネオス | Radioactivity-contaminated soil, contaminated silt cleaning agent and cleaning method using the same |
| JPWO2015137484A1 (en) * | 2014-03-14 | 2017-04-06 | 株式会社ピーシーエス | Ultrafine bubble cleaning method using liquid containing ultrafine bubbles, apparatus and pressurized flotation device |
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