JP2016045081A - Method for decontaminating soil - Google Patents

Method for decontaminating soil Download PDF

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JP2016045081A
JP2016045081A JP2014169615A JP2014169615A JP2016045081A JP 2016045081 A JP2016045081 A JP 2016045081A JP 2014169615 A JP2014169615 A JP 2014169615A JP 2014169615 A JP2014169615 A JP 2014169615A JP 2016045081 A JP2016045081 A JP 2016045081A
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soil
radioactive
sheet
radioactive substance
plant
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強 谷口
Tsutomu Taniguchi
強 谷口
谷口 浩司
Koji Taniguchi
浩司 谷口
正幸 榊原
Masayuki Sakakibara
正幸 榊原
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TANIGUCHI SANGYO KK
Ehime University NUC
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TANIGUCHI SANGYO KK
Ehime University NUC
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Abstract

PROBLEM TO BE SOLVED: To provide a method for decontaminating soil, which can efficiently collect and remove radioactive materials in soil.SOLUTION: A radioactive material absorption plant is planted in soil containing radioactive materials, and at least a part of a surface of the soil in which the radioactive material absorption plant is planted is covered with radioactive material absorption means. A sheet obtained by making a permeable sheet-like base material carry Prussian blue and/or zeolite can be preferably used for the radioactive material absorption means.SELECTED DRAWING: Figure 1

Description

本発明は土壌の浄化方法に関するものであり、特に放射性セシウム等の半減期の長い放射性物質を回収除去するのに適した方法に関するものである。   The present invention relates to a soil purification method, and more particularly to a method suitable for recovering and removing radioactive materials having a long half-life such as radioactive cesium.

汚染された土壌の浄化方法としては、種々の方法が試みられ、例えば大型機械を用いて数センチメートルの表土を削り取る方法や、固化剤により土壌表層を固化させて削り取る方法が行われている。このような表土の削り取りには、その場所の汚染物質を減少させる一定の効果が認められるが、広範囲に適用するには膨大な費用と労力を要し、また、削り取られる土砂は大量であるため、その保管場所の確保や、移動・管理が困難であり、特に汚染物質が放射性セシウムのように半減期の長い放射性物質である場合にはこれらの問題は深刻である
また、ゼオライトやプルシアンブルー(フェロシアン化第二鉄)等の吸着材に汚染物質を吸着させる方法も用いられている(例えば特許文献1)。しかし、このような吸着材に吸着させる方法は、例えば水中に存在する遊離イオンの吸着には有効であるが、土壌の土粒子と結合している汚染物質は実質的に吸着できず、土壌表面や土壌中に単にシートを設置するだけでは、土壌中の汚染物質を回収除去する効果は通常かなり低いことが知られている。
Various methods for purifying contaminated soil have been attempted. For example, a method of scraping a few centimeters of top soil using a large machine, or a method of solidifying a soil surface with a solidifying agent and scraping off. Such topsoil cutting has a certain effect of reducing the pollutants at the site, but it requires enormous costs and labor to apply it over a wide area, and the amount of earth and sand to be cut off is large. It is difficult to secure, move and manage the storage area, especially when the pollutant is a radioactive substance with a long half-life such as radioactive cesium. A method of adsorbing contaminants on an adsorbent such as ferric ferrocyanide is also used (for example, Patent Document 1). However, such a method of adsorbing to an adsorbent is effective, for example, for adsorbing free ions present in water, but it cannot substantially adsorb contaminants that are bound to soil soil particles. It is known that the effect of collecting and removing contaminants in the soil is usually quite low by simply installing a sheet in the soil.

一方で、ヒマワリ等の植物体に放射性物質を吸収させることも試みられている(例えば非特許文献1)。植物体は、その種類によって汚染物質を効果的に吸収し、放射性セシウムの吸収に関しては、ヒマワリは効果が低いことが明らかになってきているが、マツバイを代表とするカヤツリグサ科ハリイ属の植物が、重金属の回収除去に有効である他、放射性セシウムの吸収にも効果があることが開示されている(特許文献2〜4)。   On the other hand, attempts have been made to absorb radioactive substances in plants such as sunflowers (for example, Non-Patent Document 1). The plant body effectively absorbs pollutants depending on its type, and sunflower has been found to be less effective in absorbing radioactive cesium. In addition to being effective for recovery and removal of heavy metals, it is disclosed that it is also effective for absorption of radioactive cesium (Patent Documents 2 to 4).

しかしながら、このように植物体に吸収させる方法では、植物が枯れると吸収された放射性物質が土壌中に再び放出されるため、それを防止するためには、植物が健康に生きている間に土壌から抜き取り、撤去及び焼却等の処理を行わなければならない。しかしながら、この方法では抜き取りのタイミングが限られるのみならず、健康な状態の植物は水分を多く含み、かさばるため、抜き取り及びその後の処理にやはり相当な労力と費用を要するという問題を有する。   However, in this method of absorbing the plant body, when the plant dies, the absorbed radioactive material is released again into the soil. Therefore, in order to prevent it, the soil is removed while the plant is healthy. It must be taken out of, removed and incinerated. However, this method has a problem that not only the timing of extraction is limited, but also plants in a healthy state are rich in moisture and bulky, so that extraction and subsequent processing still require considerable labor and cost.

特開2013−57575号公報JP2013-57575A 国際公開第2007/091382号パンフレットInternational Publication No. 2007/091382 Pamphlet 特開2010−193882号公報JP 2010-193882 A 特開2013−104696号公報JP2013-104696A

農林水産省、「ふるさとへの帰還に向けた取組」農地土壌除染技術開発Ministry of Agriculture, Forestry and Fisheries develops soil decontamination technology for farmland

本発明は上記に鑑みてなされたものであり、土壌中の放射性物質を、従来よりも労力や費用を抑えつつ、効率的に回収除去できる方法を提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a method capable of efficiently recovering and removing radioactive materials in soil while reducing labor and cost.

本発明の土壌の浄化方法は、上記の課題を解決するために、放射性物質を含む土壌に放射性物質吸収植物を植え付け、かつ、この放射性物質吸収植物の植え付けられた土壌表面の少なくとも一部を放射性物質吸着手段で覆うことを特徴とする。   In order to solve the above-described problems, the soil purification method of the present invention plants a radioactive substance-absorbing plant in soil containing a radioactive substance, and at least part of the soil surface on which the radioactive substance-absorbing plant is planted is radioactive. It is characterized by covering with a substance adsorbing means.

上記本発明の土壌の浄化方法において、上記放射性物質吸着手段としては、例えば、透水性を有するシート状基材にプルシアンブルー及び/又はゼオライトを担持させたシートを用いることができる。   In the soil purification method of the present invention, as the radioactive substance adsorbing means, for example, a sheet in which Prussian blue and / or zeolite is supported on a water-permeable sheet-like base material can be used.

上記放射性物質吸着手段のシート状基材としては、ポリエステル、ポリアミド、及びポリオレフィンの中から選択された1種又は2種以上の合成樹脂からなり、目付が50〜600g/m2の範囲内であるポリエステル不織布を好適に用いることができる。 The sheet-like substrate of the radioactive substance adsorbing means is composed of one or more synthetic resins selected from polyester, polyamide and polyolefin, and has a basis weight in the range of 50 to 600 g / m 2. A polyester nonwoven fabric can be suitably used.

また、放射性物質吸収植物としては、カヤツリグサ科ハリイ属の植物を用いることができ、中でもマツバイを好適に用いることができる。   Further, as the radioactive substance-absorbing plant, a plant belonging to the genus Haryiaceae can be used, and among these, a pine tree can be suitably used.

本発明の土壌の浄化方法によれば、放射性物質吸着シートと放射性物質吸収植物との併用により、放射性物質吸着シートのみでは従来は回収除去できなかった、土壌中で、土粒子と結合した放射性物質を、従来よりもはるかに効率的に処理することができ、また植物が生きている間に抜き取って処理する必要がないため、処理工程全体としての労力と費用を大幅に低減させることが可能となる。   According to the soil purification method of the present invention, the combined use of the radioactive substance adsorbing sheet and the radioactive substance absorbing plant, the radioactive substance combined with the soil particles in the soil that could not be recovered and removed conventionally only by the radioactive substance adsorbing sheet. Can be processed much more efficiently than before, and it is not necessary to extract and process the plant while it is alive, which can greatly reduce the labor and cost of the entire processing process. Become.

本発明の土壌の浄化方法の一実施形態を示す模式断面図である。It is a schematic cross section which shows one Embodiment of the purification method of the soil of this invention. 実施例で用いた試験方法を説明するための土地の平面図である。It is a top view of the land for demonstrating the test method used in the Example.

以下に図を用いて本発明の実施形態を説明するが、本発明はこれに限定されるものではない。   Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

図1は模式断面図であり、符号1は放射性物質吸着シートを示し、符号2は放射性物質吸収植物を示し、符号3は土壌を示し、符号4は土壌中の放射性物質を示す。   FIG. 1 is a schematic cross-sectional view. Reference numeral 1 indicates a radioactive substance adsorbing sheet, reference numeral 2 indicates a radioactive substance-absorbing plant, reference numeral 3 indicates soil, and reference numeral 4 indicates a radioactive substance in the soil.

本図に示す実施形態では、放射性物質4を含む土壌3の少なくとも一部を放射性物質吸着手段であるシート(以下、「放射性物質吸着シート」又は単に「シート」という場合もある)1で覆い、かつ、その土壌3で放射性物質吸収植物(以下、単に植物という場合もある)2を栽培する。栽培されている植物2は遊離の放射性物質のみならず、土壌中で土粒子と結合した放射性物質も吸収することができ、代謝に伴い再放出される放射性物質を植物2の周りの土壌3の表面を覆うシート1が吸着する。植物2に吸収された放射性物質は、植物の生育中は代謝により、葉、茎、及び根のうちの少なくともいずれかから周囲に放出されると考えられ、雨水の落下や空気の流れ等により移動し、放射性物質吸着シート1に接触した際に回収されると考えられる。   In the embodiment shown in this figure, at least a part of the soil 3 containing the radioactive substance 4 is covered with a sheet 1 (hereinafter also referred to as “radioactive substance adsorbing sheet” or simply “sheet”) that is a radioactive substance adsorbing means, And the radioactive substance absorption plant (henceforth only a plant) 2 is cultivated in the soil 3. The plant 2 that is cultivated can absorb not only free radioactive substances but also radioactive substances combined with soil particles in the soil, and the radioactive substances that are re-released with metabolism are absorbed in the soil 3 around the plants 2. The sheet 1 covering the surface is adsorbed. The radioactive material absorbed by the plant 2 is considered to be released to the surroundings from at least one of the leaves, stems, and roots by metabolism during the growth of the plant, and is moved by the fall of rainwater, the flow of air, etc. However, it is considered that it is recovered when it contacts the radioactive substance adsorbing sheet 1.

本発明で用いる放射性物質吸着手段は、回収除去を目的とする放射性物質を吸着し、一定期間保持しうる放射性物質吸着物質を含有するものであれば特に限定されず、放射性物質吸着物質の例としては、プルシアンブルー(フェロシアン化第二鉄)、ゼオライト(アルミノケイ酸塩)等が挙げられ、これらは1種を単独で用いることも、2種以上を混合して用いることもできる。   The radioactive substance adsorbing means used in the present invention is not particularly limited as long as it contains a radioactive substance adsorbing substance that adsorbs a radioactive substance for the purpose of recovery and can be retained for a certain period of time, and as an example of a radioactive substance adsorbing substance Includes Prussian blue (ferric ferrocyanide), zeolite (aluminosilicate) and the like, and these can be used alone or in combination of two or more.

ここでプルシアンブルーとは、一般にAyFe[Fe(CN6)]x・zH2O(Aはカチオンを示す)の組成式で表される青色顔料であり、内部に空隙を有する結晶構造を有し、遊離状態のセシウムイオン等の放射性物質はこの空隙内に取り込まれると考えられている。プルシアンブルーには異なる組成を有するものが存在するが、そのいずれも同様の結晶構造を有し、従って本発明においていずれも使用可能である。 Here, Prussian blue is a blue pigment generally represented by a composition formula of A y Fe [Fe (CN 6 )] x · zH 2 O (A represents a cation), and has a crystal structure having voids inside. It is thought that radioactive substances such as cesium ions in the free state are taken into the voids. Some Prussian blues have different compositions, all of which have the same crystal structure, and therefore can be used in the present invention.

また、ゼオライトは、アルミノケイ酸塩の中で内部に比較的大きな空隙を有する結晶構造を有するものの総称であり、プルシアンブルーと同様に放射性物質はこの空隙内に取り込まれると考えられる。従って、ゼオライトにも異なる組成を有するものが存在するが、いずれも本発明で使用可能である。   Zeolite is a general term for aluminosilicates having a crystal structure having a relatively large void inside, and it is considered that radioactive substances are taken into these voids in the same manner as Prussian blue. Therefore, some zeolites have different compositions, but any of them can be used in the present invention.

また、上記放射性物質吸着物質の形態も特に限定されず、例えば粉末状や顆粒状であってもよいが、取扱いが容易である点から、シート状の基材に放射性物質吸着物質を何らかの方法で担持させたものであることが好ましい。   Further, the form of the radioactive substance adsorbing material is not particularly limited, and may be, for example, powder or granule. From the viewpoint of easy handling, the radioactive substance adsorbing substance is applied to the sheet-like substrate by some method. It is preferable that it is supported.

ここで「シート状」とは、織布、不織布等の布帛、紙、編み地、網、薄板等の土壌を覆うことが可能な種々の形態のものを含むものとする。また、シート状基材の素材も限定されず、例えば、天然素材では、木綿、麻、パルプ等の植物性繊維、羊毛等の動物性繊維のいずれも使用でき、ポリエステル等の合成樹脂等も広く使用可能である。但し、屋外で使用し、植物を栽培する土壌を覆うものであり、使用後もシート状のまま回収できることが好ましいので、シート状物として適度な透水性、通気性、耐久性を有することが好ましく、また環境への影響が少ない素材からなることが好ましい。これらの条件を兼ね備え、かつ安価であることから、合成樹脂製の不織布が好適に用いられる。合成樹脂は、特に限定されないが、ポリエステル、ポリアミド、及びポリオレフィンが好ましく、これらの樹脂2種以上を用いたものであってもよい。またこの不織布は、目付が50〜600g/m2の範囲内であることが好ましく、80〜300g/m2の範囲内がより好ましい。目付が上記範囲内である場合、シートとして十分な強度を有し、取扱いが容易であるのみならず、水や空気の保持能力が高いため植物の生育も良好で、放射性物質吸着物質を十分に担持させることが可能となる。これらの効果に加えてコストも考慮すると、目付は100〜120g/m2の範囲内が特に好ましい。 Here, the “sheet form” includes various forms capable of covering soil such as fabrics such as woven fabrics and nonwoven fabrics, papers, knitted fabrics, nets, and thin plates. In addition, the material of the sheet-like base material is not limited. For example, in the case of natural materials, plant fibers such as cotton, hemp, and pulp, and animal fibers such as wool can be used, and synthetic resins such as polyester are widely used. It can be used. However, since it is used outdoors and covers the soil where plants are cultivated and can be recovered as a sheet after use, it is preferable to have appropriate water permeability, breathability, and durability as a sheet. Further, it is preferably made of a material having little influence on the environment. A synthetic resin non-woven fabric is preferably used because it has these conditions and is inexpensive. The synthetic resin is not particularly limited, but polyester, polyamide, and polyolefin are preferable, and those using two or more of these resins may be used. Also the nonwoven fabric is preferably basis weight in the range of 50~600g / m 2, the range of 80~300g / m 2 is more preferable. When the basis weight is within the above range, it has sufficient strength as a sheet and is easy to handle, and also has high water and air retention ability, so that the growth of the plant is good and the radioactive substance adsorbent is sufficient. It can be supported. When cost is taken into consideration in addition to these effects, the basis weight is particularly preferably in the range of 100 to 120 g / m 2.

放射性物質吸着物質を上記基材に担持させる方法も特に限定されないが、例えばその物質の溶液又は分散液を調製可能な場合は、溶液又は分散液を調製して、これに基材となる布帛等を浸漬し、乾燥させることにより得られる。溶液又は分散液が調製困難な場合は、例えば基材を袋状に形成して、その袋状部分に放射性物質吸着物質を入れることができる。また基材の原料が合成樹脂の場合は、原料の樹脂に放射性物質吸着物質を配合して、所望の形状にすることもできる。   The method for supporting the radioactive substance adsorbing substance on the base material is not particularly limited. For example, when a solution or dispersion liquid of the substance can be prepared, a solution or dispersion liquid is prepared, and a cloth or the like serving as the base material is prepared. Is obtained by immersing and drying. When it is difficult to prepare a solution or a dispersion, for example, a base material can be formed in a bag shape, and a radioactive substance adsorbing substance can be put into the bag-shaped portion. Moreover, when the raw material of a base material is a synthetic resin, a radioactive substance adsorption substance can be mix | blended with the raw material resin, and it can also be made into a desired shape.

次に、本発明で用いる放射性物質吸収植物は、回収除去を目的とする放射性物質を吸収し得るものであればよく、特に限定されない。放射性セシウムの回収除去にはカヤツリグサ科ハリイ属の植物を用いることができ、特にマツバイが高い効果を有する。マツバイは栄養素として必要なカリウムと誤認してセシウムを吸収すると考えられている。放射性セシウムを吸収する植物としては、上記以外に苔類等のコケ植物も使用可能である。   Next, the radioactive substance-absorbing plant used in the present invention is not particularly limited as long as it can absorb radioactive substances intended for recovery and removal. For recovery and removal of radioactive cesium, a plant belonging to the genus Haryiaceae can be used. Matsubai is thought to absorb cesium by misidentifying potassium as a nutrient. In addition to the above, moss plants such as moss can also be used as plants that absorb radioactive cesium.

放射性物質を根から吸収した植物は、そのメカニズムは明らかではないが、代謝により放射性物質を放出すると考えられる。従って、放射性物質吸着手段は、植物から放出された放射性物質をなるべく多く吸着できることが好ましく、全て吸着することが可能な量の放射性物質吸着物質を含有していることがより好ましい。   Plants that have absorbed radioactive substances from their roots are thought to release radioactive substances by metabolism, although the mechanism is not clear. Therefore, the radioactive substance adsorbing means is preferably capable of adsorbing as much radioactive substance released from plants as possible, and more preferably contains an amount of radioactive substance adsorbing substance capable of adsorbing all.

放射性物質吸着手段がシート状物の場合は、植物の生育領域とその周囲の土壌を覆うのに十分な大きさを有するのが好ましい。具体的な設置方法は、シートの形態や、植物の種類、状態等に応じて適宜選択すればよく、例えば土壌を先にシートで覆い、その上に植物の苗を置いたり、種を蒔いたりする方法や、栽培前に予めシートと植物とを一体化させたものを作成し、これを土壌に置く方法、又は植物を先に植え、その後に植物の周囲の土壌をシートで覆う方法を用いることができる。   When the radioactive substance adsorbing means is a sheet, it is preferable that the radioactive substance adsorbing means has a size sufficient to cover the growing area of the plant and the surrounding soil. The specific installation method may be appropriately selected according to the form of the sheet, the type of plant, the state, etc. For example, the soil is first covered with a sheet, and plant seedlings are placed on it, or seeds are planted. Use a method of making a sheet and a plant integrated in advance before cultivation and placing this on soil, or a method of planting a plant first and then covering the soil around the plant with a sheet be able to.

放射性物質を吸着した放射性物質吸着手段は、そのまま焼却処分したり、容器に入れて保管するか、又は吸着手段から放射性物質を抽出した後に処分管理する。   The radioactive substance adsorbing means that adsorbs the radioactive substance is disposed of by incineration as it is, stored in a container, or managed after the radioactive substance is extracted from the adsorbing means.

本発明によれば、従来は放射性物質吸着手段では回収除去が困難であった土壌中の土粒子と結合した放射性物質を、これを吸収する植物を介して取り込むことができる。また、放射性物質吸収植物は、従来は健康に成育している最中に抜き取って処分する必要があったのを、枯れるまで放置することができるため、抜き取り及び焼却等の処理が容易になる。   According to the present invention, the radioactive substance combined with the soil particles in the soil, which has been difficult to recover and remove by the radioactive substance adsorbing means, can be taken in through the plant that absorbs the radioactive substance. In addition, radioactive material-absorbing plants, which conventionally had to be extracted and disposed of during healthy growth, can be left until they wither, so that they can be easily extracted and incinerated.

従って、本発明の土壌の浄化方法によれば、放射性物質吸着手段と放射性物質吸収植物とを併用することにより、それぞれを単独で使用して回収除去できる量の総和以上の放射性物質を回収除去することが可能となる。   Therefore, according to the soil purification method of the present invention, the radioactive substance adsorbing means and the radioactive substance-absorbing plant are used in combination to collect and remove radioactive substances that are more than the total amount that can be collected and removed independently of each other. It becomes possible.

以下に本発明を実施例により、さらに具体的に説明するが、本発明は以下の実施例に限定されるものではない。   The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the following examples.

1.プルシアンブルー含有シート使用例
[実施例1,2、比較例1,2]
福島県内の湿地内の同一敷地内の2箇所に、地上高さ5cmの柵で囲んで、面積100cm×200cmの試験区(試験区A及び試験区B)を設けた。各試験区内の土壌を撹拌して四隅(角からの距離xが約10cm)及び中央部(図2において破線による丸印を付した場所)において土壌を採取し、混合して土壌線量を求めたところ、Cs134が24000Bq/kg、Cs137が50000Bq/kgであった。
1. Example of using Prussian blue-containing sheet [Examples 1 and 2, Comparative Examples 1 and 2]
A test zone (test zone A and test zone B) having an area of 100 cm × 200 cm was provided in two places on the same site in the wetland in Fukushima Prefecture, surrounded by a fence with a height of 5 cm above the ground. The soil in each test area is stirred and the soil is sampled at the four corners (distance x from the corner is about 10 cm) and in the center (the place marked with a broken line in FIG. 2) and mixed to obtain the soil dose. As a result, Cs134 was 24000 Bq / kg and Cs137 was 50000 Bq / kg.

各試験区を図2に示すようにそれぞれ8等分して、区分a〜dにはブルシアンブルー含有シートを敷き、そのシート上にマツバイの株をそれぞれ置き、一方、区分e〜hには土壌の上にマツバイの株を直接置き、1ヶ月間放置した。プルシアンブルー含有シートとしては以下のものを使用した。   As shown in FIG. 2, each test section is divided into eight equal parts, and a brussian blue-containing sheet is laid on the sections a to d, and a Matsubai strain is placed on the sheet. A strain of Matsubai was placed directly on the soil and left for one month. As the Prussian blue-containing sheet, the following was used.

A区:プルシアンブルー含有長繊維シート
B区:プルシアンブルー含有短繊維シート
Section A: Prussian blue-containing long fiber sheet Section B: Prussian blue-containing short fiber sheet

1ヶ月経過後、試験区A及びBから試料(シート、マツバイ)を採取して、超音波洗浄を行ったのち、放射性セシウム(Cs−134、Cs−137)の放射能濃度(Bq/kg)を測定した。放射能濃度測定はゲルマニウム半導体検出器(Canberra MODEL GC2520)によるγ線スペクトロメトリーにより行った。なお、シート上でマツバイを栽培した試料は、シートとマツバイを分離して洗浄を行い、試料の乾燥重量を測定したのち放射性濃度の測定に供した。結果を表1に示す。   After 1 month, samples (sheets, pine trees) are collected from test sections A and B, and after ultrasonic cleaning, the radioactive concentration of radioactive cesium (Cs-134, Cs-137) (Bq / kg) Was measured. The radioactivity concentration was measured by γ-ray spectrometry using a germanium semiconductor detector (Canberra MODEL GC2520). In addition, the sample which cultivated the pine tree on the sheet | seat separated and wash | cleaned the sheet | seat and the pine tree, and used for the measurement of radioactive concentration after measuring the dry weight of a sample. The results are shown in Table 1.

Figure 2016045081
Figure 2016045081

表1に示された結果から、プルシアンブルー含有シートをマツバイと併用した実施例1及び2では、マツバイを単独で使用した比較例1及び2と比較して放射性セシウムの総吸着量が大きく向上したことが分かる。   From the results shown in Table 1, in Examples 1 and 2 in which Prussian blue-containing sheets were used in combination with Matsubai, the total amount of radioactive cesium adsorbed was greatly improved compared to Comparative Examples 1 and 2 in which Matsubai was used alone. I understand that.

[実施例3、比較例3]
福島県内の湿地内に、面積100cm×200cmの試験区(C区)を設けた。上記と同様にして、四隅と中央部の土壌を採取し、混合して土壌線量(Cs134とCs137の合計量)を求めたところ、41000Bq/kgであった。
[Example 3, Comparative Example 3]
A test zone (C zone) having an area of 100 cm × 200 cm was provided in a wetland in Fukushima Prefecture. In the same manner as described above, soils at the four corners and the central part were collected and mixed to obtain a soil dose (total amount of Cs134 and Cs137), which was 41000 Bq / kg.

試験区Cを上記試験区A等と同様に8等分して、実施例3として、区分e及び区分gにブルシアンブルー含有繊維シートを敷き、そのシート上にマツバイの株をそれぞれ置き、一方、区分a及び区分cには土壌の上にブルシアンブルー含有繊維シートを敷いたのみとし、2週間放置後及び4週間放置後の放射性セシウムの放射線濃度(Cs−134とCs−137の合計量、Bq/kg)を測定した。実施例3の試料は、上記と同様にシートとマツバイを分離して洗浄を行い、試料の乾燥重量を測定したのち放射性濃度の測定に供した。結果を表2に示す。   The test section C was equally divided into eight sections in the same manner as the test section A and the like, and as Example 3, a brussian blue-containing fiber sheet was laid on the sections e and g, and a Matsubai strain was placed on the sheet. In Category a and Category c, only a brussian blue-containing fiber sheet was laid on the soil, and the radiation concentration of radioactive cesium after 2 weeks and 4 weeks (total amount of Cs-134 and Cs-137) , Bq / kg). The sample of Example 3 was separated and washed in the same manner as described above, washed, measured for the dry weight of the sample, and then subjected to measurement of radioactive concentration. The results are shown in Table 2.

Figure 2016045081
Figure 2016045081

表2に示された結果から、プルシアンブルー含有シートをマツバイと併用した実施例3は、同シートを単独で使用した比較例3と比較して放射性セシウムの総吸着量が大きく向上したことが分かる。   From the results shown in Table 2, it can be seen that in Example 3 in which the Prussian blue-containing sheet was used in combination with Matsubai, the total adsorption amount of radioactive cesium was greatly improved as compared with Comparative Example 3 in which the sheet was used alone. .

2.ゼオライト含有シート使用例
[実施例4、比較例4,5]
福島県内の湿地から土壌5.9kgを採取し(土壌1)、均一になるように混合してトレイ(深さ3cm)に入れ、水道水1.5リットルを加えた。
2. Example of using zeolite-containing sheet [Example 4, Comparative Examples 4 and 5]
5.9 kg of soil was collected from the wetlands in Fukushima Prefecture (soil 1), mixed uniformly and placed in a tray (depth 3 cm), and 1.5 liters of tap water was added.

実施例4として、その土壌1の上にゼオライト含有シート(基材:植物繊維製紙、目付233g/m2、ゼオライト担持量100g/m2)を敷き、そのシート上にマツバイの株を置いた。 Example 4, the zeolite-containing sheet on the soil 1 (base: plant fiber paper, basis weight 233 g / m 2, a zeolite supported amount 100 g / m 2) laid, placed strains Eleocharis acicularis on its seat.

比較例4では、シートを敷かずにマツバイのみを土壌2に置き、比較例5では、シートを敷くのみとした。   In Comparative Example 4, only the pine bye was placed on the soil 2 without laying a sheet, and in Comparative Example 5, only the sheet was laid.

トレイをビニールハウス内で保管し、水の量がほぼ一定に保たれるように必要に応じて注水した。   The tray was stored in a plastic house and water was poured as needed so that the amount of water was kept almost constant.

2週間経過後、試料(シート、マツバイ)を採取して、超音波洗浄を行ったのち、上記と同じ方法で放射性セシウムの放射能濃度(Cs−134とCs−137との合計濃度、Bq/kg)を測定した。結果を表3に示す。   After two weeks, a sample (sheet, pine bibli) was collected and subjected to ultrasonic cleaning, and then the radioactive concentration of radioactive cesium (total concentration of Cs-134 and Cs-137, Bq / kg). The results are shown in Table 3.

[実施例5、比較例6,7]
福島県内水路から土壌4.7kgを採取し(土壌2)、均一になるように混合してトレイ(深さ2cm)に入れ、水道水1.5リットルを加えた。
[Example 5, Comparative Examples 6 and 7]
4.7 kg of soil was collected from a waterway in Fukushima Prefecture (soil 2), mixed uniformly and placed in a tray (depth 2 cm), and 1.5 liters of tap water was added.

実施例5として、その土壌2の上に実施例4と同じゼオライト含有シートを敷き、そのシート上にマツバイの株を置いた。   As Example 5, the same zeolite-containing sheet as that of Example 4 was laid on the soil 2, and a Matsubai strain was placed on the sheet.

比較例6では、シートを敷かずにマツバイのみを土壌2に置き、比較例7では、シートを敷くのみとした。   In Comparative Example 6, only the pine bye was placed on the soil 2 without laying the sheet, and in Comparative Example 7, only the sheet was laid.

トレイをビニールハウス内で保管し、水の量がほぼ一定に保たれるように必要に応じて注水し、2週間経過後、上記と同様にして放射性セシウムの放射能濃度を測定した。結果を表3に示す。   The tray was stored in a greenhouse, and water was poured as necessary so that the amount of water was kept almost constant. After two weeks, the radioactive concentration of radioactive cesium was measured in the same manner as described above. The results are shown in Table 3.

Figure 2016045081
Figure 2016045081

表3に示された結果から、ゼオライト含有シートをマツバイと併用した場合も、優れた放射性セシウム吸着効果が得られたことが分かる。   From the results shown in Table 3, it can be seen that even when the zeolite-containing sheet was used in combination with Matsubai, an excellent radiocesium adsorption effect was obtained.

3.目付の異なるポリエステル不織布を用いたマツバイの生育試験
土壌をトレイに入れて、次表4に示した目付をそれぞれ有するポリエステル不織布(「*120」は短繊維、それ以外は全て長繊維)を土壌表面に敷き、シートがほぼ浸る量の水道水を注いだ。大きさを揃えたマツバイの苗(根の長さ:2cm以下)をそれぞれのシートの上において、トレイをビニールハウス内で保管し、水の量がほぼ一定に保たれるように必要に応じて注水した。6週間経過後に各シート上に置いたマツバイの根の長さを測定した。根の長さは、最も長く伸びている根から3番目までの根について測定し、それぞれ平均値を求めた。結果を表4に示す。
3. Test of growth of pine trees using polyester nonwoven fabrics with different basis weights Put the soil in a tray and polyester nonwoven fabrics with the basis weights shown in the following table 4 ("* 120" is short fiber, all others are long fibers) soil surface The tap water was poured in such a way that the sheet was almost immersed. Place the pine seedlings (root length: 2 cm or less) of the same size on each sheet, store the tray in the greenhouse, and keep the amount of water almost constant as necessary. Water was poured. After 6 weeks, the length of the pine tree roots placed on each sheet was measured. The length of the roots was measured from the longest extending root to the third root, and an average value was obtained for each. The results are shown in Table 4.

Figure 2016045081
Figure 2016045081

表4に示された結果から、目付120、200、300(単位:g/m2)のシート上に置いたマツバイの生育が特に良好であったことが分かる。 From the results shown in Table 4, it can be seen that the growth of pine trees placed on a sheet having a basis weight of 120, 200, 300 (unit: g / m 2 ) was particularly good.

1…放射性物質吸着シート、2…放射性物質吸収植物
3…土壌、4…放射性物質
DESCRIPTION OF SYMBOLS 1 ... Radioactive material adsorption sheet, 2 ... Radioactive material absorption plant 3 ... Soil, 4 ... Radioactive material

Claims (5)

放射性物質を含む土壌に放射性物質吸収植物を植え付け、かつ、この放射性物質吸収植物の植え付けられた土壌表面の少なくとも一部を放射性物質吸着手段で覆う
ことを特徴とする土壌の浄化方法。
A soil purification method comprising planting a radioactive substance-absorbing plant in a soil containing a radioactive substance, and covering at least a part of the soil surface on which the radioactive substance-absorbing plant is planted with a radioactive substance adsorbing means.
前記放射性物質吸着手段が、透水性を有するシート状基材にプルシアンブルー及び/又はゼオライトを担持させたシートであることを特徴とする、請求項1に記載の土壌の浄化方法。   The soil purification method according to claim 1, wherein the radioactive substance adsorbing means is a sheet in which Prussian blue and / or zeolite is supported on a water-permeable sheet-like base material. 前記放射性物質吸着手段のシート状基材が、ポリエステル、ポリアミド、及びポリオレフィンの中から選択された1種又は2種以上の合成樹脂からなり、目付が50〜600g/m2の範囲内である不織布であることを特徴とする、請求項2に記載の土壌の浄化方法。 The sheet-like substrate of the radioactive substance-adsorbing means comprises polyester, polyamides, and from one or more synthetic resin selected from polyolefins, is in the range having a basis weight of 50~600g / m 2 nonwoven The soil purification method according to claim 2, wherein: 前記放射性物質吸収植物としてカヤツリグサ科ハリイ属の植物を用いることを特徴とする、請求項1〜3のいずれか1項に記載の土壌の浄化方法。   The soil purification method according to any one of claims 1 to 3, wherein a plant belonging to the genus Haryiaceae is used as the radioactive substance-absorbing plant. 前記カヤツリグサ科ハリイ属の植物がマツバイであることを特徴とする、請求項4に記載の土壌の浄化方法。   The soil purification method according to claim 4, wherein the plant of the genus Haryiaceae is a pine pine.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018181605A1 (en) * 2017-03-29 2018-10-04 株式会社キュアテックス Agricultural and horticultural material including knitted or woven japanese paper yarn
CN110619970A (en) * 2019-08-19 2019-12-27 南华大学上虞高等研究院有限公司 Up-flow anaerobic biological double-layer filter based on acidic uranium-containing wastewater treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018181605A1 (en) * 2017-03-29 2018-10-04 株式会社キュアテックス Agricultural and horticultural material including knitted or woven japanese paper yarn
CN110619970A (en) * 2019-08-19 2019-12-27 南华大学上虞高等研究院有限公司 Up-flow anaerobic biological double-layer filter based on acidic uranium-containing wastewater treatment

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