JP2013242235A - Contamination water treatment unit - Google Patents

Contamination water treatment unit Download PDF

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JP2013242235A
JP2013242235A JP2012116030A JP2012116030A JP2013242235A JP 2013242235 A JP2013242235 A JP 2013242235A JP 2012116030 A JP2012116030 A JP 2012116030A JP 2012116030 A JP2012116030 A JP 2012116030A JP 2013242235 A JP2013242235 A JP 2013242235A
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contaminated water
water
treatment unit
water treatment
contaminated
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Yuichi Tsukahara
裕一 塚原
Noboru Semizu
昇 瀬水
Hiroshi Tsuchiya
浩 土屋
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Shimizu Construction Co Ltd
Nichias Corp
Shimizu Corp
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Shimizu Construction Co Ltd
Nichias Corp
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To remove radioactive cesium ions from contamination water containing radioactive cesium ions.SOLUTION: A contamination water treatment unit 2 for removing radioactive cesium ions from contamination water containing radioactive cesium ions includes a holding member for holding multiple pieces of granular zeolite 11D. The holding member allows the multiple pieces of granular zeolite 11D to be held in a state to have contact with contamination water and to prevent flow-out from the holding member.

Description

本発明は、汚染水処理ユニットに関する。   The present invention relates to a contaminated water treatment unit.

原子力発電所のような放射性物質を扱う原子力施設では、事故により施設から大量の放射性物質が漏洩する恐れがある。   In nuclear facilities that handle radioactive materials such as nuclear power plants, there is a risk that a large amount of radioactive materials may leak from the facility due to an accident.

原子力施設から放射性物質が漏洩すると、施設周辺にある建物等の工作物や土壌が放射性物質に汚染される。漏洩する放射性物質には、さまざまな放射性核種が含まれている。それら放射性核種の中で特に重視されるのは、セシウム１３４（１３４Ｃｓ）及びセシウム１３７（１３７Ｃｓ）である。 When radioactive materials leak from a nuclear facility, buildings and soil around buildings and the like are contaminated with radioactive materials. Various radioactive nuclides are contained in the leaking radioactive material. Of these radionuclides, cesium 134 ( 134 Cs) and cesium 137 ( 137 Cs) are particularly important.

セシウム１３４の半減期は約２年であり、セシウム１３７の半減期は約３０年である。そのため、これら放射性セシウムに汚染された工作物や土壌は、そのまま放置していると汚染された状態が長期間続く。したがって、長期にわたる大量被ばくの恐れから、汚染された地域の住民がその地域で生活を続けることは困難になる。そこで、放射性セシウムに汚染された地域では、生活環境を早急に回復するために、工作物や土壌の除染を行って放射性セシウムを除去することが求められる。   The half-life of cesium 134 is about 2 years, and the half-life of cesium 137 is about 30 years. For this reason, if the work and soil contaminated with these radioactive cesiums are left as they are, the contaminated state continues for a long period of time. Therefore, it is difficult for residents in contaminated areas to continue living in the area due to the fear of massive exposure over time. Therefore, in an area contaminated with radioactive cesium, in order to quickly recover the living environment, it is necessary to decontaminate the work and soil to remove the radioactive cesium.

一般的な除染方法は、汚染された工作物や土壌を水で洗浄する方法である。ところが、この方法では、洗浄により生じる除染廃液に放射性セシウムが含まれている。そのため、除染廃液を回収し、除染廃液から放射性セシウムを除去する処理を行う必要がある。   A common decontamination method is to wash contaminated workpieces and soil with water. However, in this method, radioactive cesium is contained in the decontamination waste liquid generated by washing. Therefore, it is necessary to collect the decontamination waste liquid and perform a process of removing radioactive cesium from the decontamination waste liquid.

除染廃液は、通常、砂などの微細粒子が水中に分散した懸濁液である。除染廃液に含まれる放射性セシウムは、その大部分が微細粒子に付着又は吸着している。そのため、回収した除染廃液から微細粒子を取り除くことで、除染廃液に含まれる放射性セシウムの大部分を除去することができる。   The decontamination waste liquid is usually a suspension in which fine particles such as sand are dispersed in water. Most of the radioactive cesium contained in the decontamination waste liquid adheres to or adsorbs to fine particles. Therefore, most of the radioactive cesium contained in the decontamination waste liquid can be removed by removing the fine particles from the collected decontamination waste liquid.

除染廃液から微細粒子を取り除く方法の１つとして、凝集沈殿法がある。この方法では、凝集剤を用いて除染廃液中の微細粒子を凝集させ、その凝集体を沈殿させる。これにより除染廃液は微細粒子と水とに分離する。そのため、除染廃液から微細粒子を容易に取り除くことができる（たとえば、非特許文献１を参照。）。   One method for removing fine particles from decontamination waste liquid is a coagulation precipitation method. In this method, fine particles in the decontamination waste liquid are aggregated using an aggregating agent, and the aggregates are precipitated. Thereby, the decontamination waste liquid is separated into fine particles and water. Therefore, fine particles can be easily removed from the decontamination waste liquid (see, for example, Non-Patent Document 1).

「セシウム除染水 分離剤 〜放射性物質を含む除染水の懸濁成分を高速に凝集沈殿〜」、［online］、株式会社フジテックス、［平成２４年５月１１日検索］、インターネット＜ＵＲＬ：http://www.saigai-kiki.com/coagulation-settling/item-734.html＞"Cesium Decontamination Water Separation Agent-Aggregation and Precipitation of Suspended Components Containing Radioactive Substances at High Speed", [online], Fujitex Co., Ltd., [Search May 11, 2012], Internet <URL : Http://www.saigai-kiki.com/coagulation-settling/item-734.html>

しかしながら、放射性セシウムはわずかに水に溶解する。そのため、微細粒子を取り除いた後の水は、放射性セシウムイオンを含んでいる。したがって、除染廃液から微小粒子を取り除いた水は、汚染水として扱う必要がある。すなわち、放射性セシウムイオンを除去する処理を行う必要がある。   However, radioactive cesium is slightly soluble in water. Therefore, the water after removing the fine particles contains radioactive cesium ions. Therefore, the water from which the fine particles are removed from the decontamination waste liquid needs to be handled as contaminated water. That is, it is necessary to perform a process for removing radioactive cesium ions.

本発明は、上記に鑑みてなされたものであって、放射性セシウムイオンを含む汚染水から放射性セシウムイオンを除去することが可能な汚染水処理ユニットを提供することを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at providing the contaminated water processing unit which can remove a radioactive cesium ion from the contaminated water containing a radioactive cesium ion.

上述した目的を達成するために、本発明の請求項１に係る汚染水処理ユニットは、放射性セシウムイオンを含む汚染水から放射性セシウムイオンを除去する汚染水処理ユニットであって、複数の粒状ゼオライトを保持する保持部材を備え、保持部材は、複数の粒状ゼオライトを、汚染水と接触し、かつ保持部材からの流出を阻止する状態に保持することを特徴とする。   In order to achieve the above-described object, a contaminated water treatment unit according to claim 1 of the present invention is a contaminated water treatment unit for removing radioactive cesium ions from contaminated water containing radioactive cesium ions. A holding member for holding is provided, and the holding member holds the plurality of granular zeolites in a state of contacting with contaminated water and preventing outflow from the holding member.

本発明の請求項２に係る汚染水処理ユニットは、上記請求項１に係る汚染水処理ユニットにおいて、保持部材は、複数の粒状ゼオライトを充填可能な内部空間を有する容器状を成し、汚染水を内部空間に透水する第１の透水部と、粒状ゼオライト間を通過した水を保持部材の外部に透水する第２の透水部とを備えることを特徴とする。   The contaminated water treatment unit according to claim 2 of the present invention is the contaminated water treatment unit according to claim 1, wherein the holding member has a container shape having an internal space capable of being filled with a plurality of granular zeolites. And a second water permeable portion for allowing water that has passed between the granular zeolites to flow to the outside of the holding member.

本発明の請求項３に係る汚染水処理ユニットは、上記請求項１に係る汚染水処理ユニットにおいて、保持部材は、繊維状物質で形成された透水性を有する部材であり、繊維状物質の隙間に粒状ゼオライトを定着させて保持することを特徴とする。   The contaminated water treatment unit according to claim 3 of the present invention is the contaminated water treatment unit according to claim 1, wherein the holding member is a water-permeable member formed of a fibrous substance, and the gap between the fibrous substances It is characterized in that the granular zeolite is fixed and held.

本発明に係る汚染水処理ユニットは、複数の粒状ゼオライトを、汚染水と接触し、かつ保持部材からの流出を阻止する状態に保持している。ゼオライトは、ナトリウムイオンなどの陽イオンを結晶構造中に取り込むことで、電気的に中性の状態を保っている。また、ゼオライトには陽イオン交換能があり、セシウムイオンはゼオライトにおける陽イオン交換の優先順位が高い。そのため、放射性セシウムイオンを含む汚染水がゼオライトに接すると、その界面において、汚染水中の放射性セシウムイオンと、ゼオライトに取り込まれている陽イオンとのイオン交換が起こる。すなわち、汚染水中の放射性セシウムイオンは、イオン交換によりゼオライトに吸着する。その結果、汚染水に含まれる放射性セシウムイオンの量が低減する。したがって、本発明に係る汚染水処理ユニットは、汚染水から放射性セシウムイオンを除去することができる。   The contaminated water treatment unit according to the present invention holds a plurality of granular zeolites in contact with the contaminated water and in a state of preventing outflow from the holding member. Zeolite maintains an electrically neutral state by incorporating cations such as sodium ions into the crystal structure. In addition, zeolite has a cation exchange capacity, and cesium ions have a high priority for cation exchange in zeolite. Therefore, when contaminated water containing radioactive cesium ions comes into contact with the zeolite, ion exchange between the radioactive cesium ions in the contaminated water and the cations taken into the zeolite occurs at the interface. That is, radioactive cesium ions in the contaminated water are adsorbed on the zeolite by ion exchange. As a result, the amount of radioactive cesium ions contained in the contaminated water is reduced. Therefore, the contaminated water treatment unit according to the present invention can remove radioactive cesium ions from the contaminated water.

図１は、本発明に係る汚染水処理ユニットを適用した除染廃液処理システムの概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of a decontamination waste liquid treatment system to which a contaminated water treatment unit according to the present invention is applied. 図２は、本発明の実施の形態１である汚染水処理ユニットの概略構成を示す分解斜視図である。FIG. 2 is an exploded perspective view showing a schematic configuration of the contaminated water treatment unit according to the first embodiment of the present invention. 図３は、実施の形態１の汚染水処理ユニットの内部構成を示す断面図である。FIG. 3 is a cross-sectional view illustrating an internal configuration of the contaminated water treatment unit according to the first embodiment. 図４は、本発明の実施の形態２である汚染水処理ユニットの内部構成を示す断面図である。FIG. 4 is a cross-sectional view showing the internal configuration of the contaminated water treatment unit according to Embodiment 2 of the present invention.

以下、図面を参照しながら、本発明に係る汚染水処理ユニットの実施の形態を詳細に説明する。なお、実施の形態を説明するための全図において、同一機能を有するものは同一符号を付け、その繰り返しの説明は省略する。   Hereinafter, embodiments of a contaminated water treatment unit according to the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

（除染廃液処理システムの構成例）
図１は、本発明に係る汚染水処理ユニットを適用した除染廃液処理システムの概略構成を示す図である。 (Configuration example of decontamination waste liquid treatment system)
FIG. 1 is a diagram showing a schematic configuration of a decontamination waste liquid treatment system to which a contaminated water treatment unit according to the present invention is applied.

本発明に係る汚染水処理ユニットは、水洗浄による除染で生じた除染廃液から放射性物質を除去する除染廃液処理システムに適用される。この除染廃液処理システムは、図１に示すように、凝集沈殿処理タンク１と、汚染水処理ユニット２と、貯水タンク３と、４本のパイプ４１、４２、４３、４４とを備える。除染で生じる除染廃液は、図示しない回収手段により回収し、パイプ４１を通して凝集沈殿処理タンク１に貯める。   The contaminated water treatment unit according to the present invention is applied to a decontamination waste liquid treatment system that removes radioactive substances from a decontamination waste liquid generated by decontamination by water washing. As shown in FIG. 1, the decontamination waste liquid treatment system includes a coagulation sedimentation treatment tank 1, a contaminated water treatment unit 2, a water storage tank 3, and four pipes 41, 42, 43, 44. The decontamination waste liquid generated by decontamination is collected by a collecting means (not shown) and stored in the coagulation sedimentation treatment tank 1 through the pipe 41.

凝集沈殿処理タンク１は、回収した除染廃液を微細粒子５と汚染水６１とに分離する容器である。回収した除染廃液は、通常、砂などの微細粒子５が汚染水６１中に分散した懸濁液である。そのため、回収した除染廃液は、凝集剤を用いて微細粒子５を凝集させ、その凝集体を沈殿させる。除染廃液に含まれる放射性物質は、その大部分が微細粒子５に付着又は吸着している。そのため、回収した除染廃液から微細粒子５を取り除くことで、除染廃液に含まれる放射性物質の大部分を除去することができる。   The coagulation sedimentation treatment tank 1 is a container that separates the collected decontamination waste liquid into fine particles 5 and contaminated water 61. The collected decontamination waste liquid is usually a suspension in which fine particles 5 such as sand are dispersed in the contaminated water 61. Therefore, the collected decontamination waste liquid aggregates the fine particles 5 using an aggregating agent, and precipitates the aggregate. Most of the radioactive substances contained in the decontamination waste liquid are attached to or adsorbed to the fine particles 5. Therefore, most of the radioactive materials contained in the decontamination waste liquid can be removed by removing the fine particles 5 from the collected decontamination waste liquid.

汚染水６１は、微細粒子５を取り除く前の除染廃液に比べれば、放射性物質の量が非常に少なくなっている。しかしながら、この汚染水６１には、水中にイオン状態で存在している放射性物質が残っている。汚染水６１に残っている放射性物質の１つとして、放射性セシウムイオンがある。本発明に係る汚染水処理ユニット２は、汚染水６１から放射性セシウムイオンを除去するものである。汚染水６１は、パイプ４２を通して汚染水処理ユニット２に送られる。汚染水処理ユニット２の構成及び作用は後述する。   The amount of radioactive material in the contaminated water 61 is very small compared to the decontamination waste liquid before removing the fine particles 5. However, in the contaminated water 61, radioactive substances that exist in an ionic state remain in the water. One of the radioactive substances remaining in the contaminated water 61 is radioactive cesium ions. The contaminated water treatment unit 2 according to the present invention removes radioactive cesium ions from the contaminated water 61. The contaminated water 61 is sent to the contaminated water treatment unit 2 through the pipe 42. The configuration and operation of the contaminated water treatment unit 2 will be described later.

汚染水処理ユニット２を通過した処理水６２は、パイプ４３を通して貯水タンク３に貯める。貯水タンク３に貯まった処理水６２は、放射能濃度を測定して問題が無いことを確認した後、パイプ４４を通して下水道や川などに放流する。   The treated water 62 that has passed through the contaminated water treatment unit 2 is stored in the water storage tank 3 through the pipe 43. The treated water 62 stored in the water storage tank 3 is discharged to the sewer or river through the pipe 44 after measuring the radioactivity concentration and confirming that there is no problem.

（実施の形態１）
図２は、本発明の実施の形態１である汚染水処理ユニットの概略構成を示す分解斜視図である。図３は、実施の形態１の汚染水処理ユニットの内部構成を示す断面図である。 (Embodiment 1)
FIG. 2 is an exploded perspective view showing a schematic configuration of the contaminated water treatment unit according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating an internal configuration of the contaminated water treatment unit according to the first embodiment.

本実施の形態の汚染水処理ユニット２は、図２及び図３に示すように、ケース部１０と、フィルタ部１１と、一対の押さえ金物１２Ａ、１２Ｂとを備える。   As shown in FIGS. 2 and 3, the contaminated water treatment unit 2 of the present embodiment includes a case portion 10, a filter portion 11, and a pair of presser fittings 12 </ b> A and 12 </ b> B.

ケース部１０は、フィルタ部１１を収容するケースであり、円筒状のフィルタ収容部１０Ａの両端にフランジ１０Ｂ、１０Ｃが形成されている。このケース部１０は、塩化ビニル樹脂を成形したものである。フィルタ収容部１０Ａは、その内径をパイプ４２、４３の内径と一致させている。ケース部１０のフランジ１０Ｂは、その寸法をパイプ４２の端に形成されたフランジ４２Ａと一致させている。同様に、ケース部１０のフランジ１０Ｃは、その寸法をパイプ４３の端に形成されたフランジ４３Ａと一致させている。ケース部１０とパイプ４２とは、フランジ１０Ｂ及びフランジ４２Ａのそれぞれに形成された貫通孔を介してボルトとナットとで締結する。同様に、ケース部１０とパイプ４３とは、フランジ１０Ｃ及びフランジ４３Ａのそれぞれに形成された貫通孔を介してボルトとナットとで締結する。   The case part 10 is a case that accommodates the filter part 11, and flanges 10 </ b> B and 10 </ b> C are formed at both ends of the cylindrical filter accommodation part 10 </ b> A. The case portion 10 is formed by molding a vinyl chloride resin. 10 A of filter accommodating parts are made to make the internal diameter correspond with the internal diameter of the pipes 42 and 43. FIG. The flange 10 </ b> B of the case portion 10 has the same dimensions as the flange 42 </ b> A formed at the end of the pipe 42. Similarly, the flange 10 </ b> C of the case portion 10 has the same dimensions as the flange 43 </ b> A formed at the end of the pipe 43. The case portion 10 and the pipe 42 are fastened with bolts and nuts through through holes formed in the flange 10B and the flange 42A, respectively. Similarly, the case portion 10 and the pipe 43 are fastened with bolts and nuts through through holes formed in the flange 10C and the flange 43A, respectively.

フィルタ部１１は、環状部材１１Ａ、第１の透水部材１１Ｂ、第２の透水部材１１Ｃ、顆粒状ゼオライト１１Ｄ、及び不織布フィルタ１１Ｅを備える。   The filter unit 11 includes an annular member 11A, a first water permeable member 11B, a second water permeable member 11C, a granular zeolite 11D, and a nonwoven fabric filter 11E.

環状部材１１Ａ、第１の透水部材（第１の透水部）１１Ｂ、及び第２の透水部材（第２の透水部）１１Ｃは、顆粒状ゼオライト１１Ｄを充填する容器を構成する部材である。   The annular member 11A, the first water permeable member (first water permeable portion) 11B, and the second water permeable member (second water permeable portion) 11C are members constituting a container filled with the granular zeolite 11D.

環状部材１１Ａは、ロックウールなどの繊維状物質を環状に成形したものであり、不透水性を持たせるための撥水処理が施されている。第１の透水部材１１Ｂ及び第２の透水部材１１Ｃは、ロックウールなどの繊維状物質を円板状に成形した部材であり、透水性を有する。第１の透水部材１１Ｂ及び第２の透水部材１１Ｃで環状部材１１Ａの開口端を塞ぐことにより、顆粒状ゼオライト１１Ｄを充填可能な内部空間を有する容器となる。環状部材１１Ａ、第１の透水層１１Ｂ、及び第２の透水層１１Ｃは、いずれもフィルタ収容部１０Ａに嵌合可能な寸法に成形する。   The annular member 11A is formed by annularly forming a fibrous substance such as rock wool, and has been subjected to water repellent treatment for imparting water impermeability. The 1st water-permeable member 11B and the 2nd water-permeable member 11C are members which shape | molded fibrous substances, such as rock wool, in disk shape, and have water permeability. By closing the opening end of the annular member 11A with the first water permeable member 11B and the second water permeable member 11C, a container having an internal space capable of being filled with the granular zeolite 11D is obtained. The annular member 11A, the first water permeable layer 11B, and the second water permeable layer 11C are all formed into dimensions that can be fitted into the filter housing portion 10A.

また、環状部材１１Ａ、第１の透水部材１１Ｂ、及び第２の透水部材１１Ｃは、いずれも顆粒状ゼオライト１１Ｄの流出を阻止することが可能な密度になるよう成形する。顆粒状ゼオライト１１Ｄは、粉末状のゼオライトに微量のモンモリロナイトを添加し、粒径が数ｍｍ程度になるよう成形したものである。したがって、環状部材１１Ａ、第１の透水部材１１Ｂ、及び第２の透水部材１１Ｃは、透水性を有し、かつ粒径が数ｍｍ程度以上の粒状固体は透過しないように成形する。なお、環状部材１１Ａについては、成形時又は成形後に上記のように撥水処理を施す。これにより、環状部材１１Ａ、第１の透水部材１１Ｂ、及び第２の透水部材１１Ｃで構成される容器は、顆粒状ゼオライト１１Ｄを、汚染水６１と接触し、かつ容器からの流出を阻止する状態に保持する保持部材として機能する。さらに、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃは、汚染水６１中に存在する微小粒子などの異物を除去するフィルターとしても機能する。   Further, the annular member 11A, the first water permeable member 11B, and the second water permeable member 11C are formed so as to have a density that can prevent the granular zeolite 11D from flowing out. Granular zeolite 11D is formed by adding a small amount of montmorillonite to powdered zeolite so that the particle size is about several mm. Accordingly, the annular member 11A, the first water permeable member 11B, and the second water permeable member 11C are formed so as to have a water permeability and not allow a granular solid having a particle size of about several millimeters or more to pass therethrough. The annular member 11A is subjected to water repellent treatment as described above at the time of molding or after molding. Thereby, the container constituted by the annular member 11A, the first water permeable member 11B, and the second water permeable member 11C contacts the granular zeolite 11D with the contaminated water 61 and prevents the outflow from the container. Functions as a holding member. Furthermore, the first water permeable member 11 </ b> B and the second water permeable member 11 </ b> C also function as a filter that removes foreign matters such as fine particles present in the contaminated water 61.

不織布フィルタ１１Ｅは、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃで除去しきれなかった微細粒子を除去するためのフィルタである。   The nonwoven fabric filter 11E is a filter for removing fine particles that could not be removed by the first water permeable member 11B and the second water permeable member 11C.

押さえ金物１２Ａ、１２Ｂは、ケース部１０のフィルタ収容部１０Ａに収容したフィルタ部１１の位置を固定するものである。この押さえ金物１２Ａ、１２Ｂは、金属板に複数の孔を形成したパンチングメタルである。押さえ金物１２Ａ、１２Ｂの直径は、いずれもフィルタ収容部１０Ａの内径よりもわずかに大きくしておく。すなわち、押さえ金物１２Ａ、１２Ｂをフィルタ収容部１０Ａに圧入することで、フィルタ収容部１０Ａ内におけるフィルタ部１１の位置を固定する。   The presser fittings 12 </ b> A and 12 </ b> B fix the position of the filter unit 11 accommodated in the filter accommodation unit 10 </ b> A of the case unit 10. The presser metal members 12A and 12B are punching metal in which a plurality of holes are formed in a metal plate. The diameters of the presser fittings 12A and 12B are both slightly larger than the inner diameter of the filter housing portion 10A. That is, the position of the filter part 11 in the filter housing part 10A is fixed by press-fitting the holding metal members 12A and 12B into the filter housing part 10A.

パイプ４２を通り汚染水処理ユニット２に流入した汚染水６１は、押さえ金物１２Ａ、第１の透水部材１１Ｂを通過した後、顆粒状ゼオライト１１Ｄの層を通過する。ゼオライトはアルミノケイ酸塩の一種であり、結晶構造中にナトリウムイオンなどの陽イオンを取り込んでいる。また、ゼオライトには陽イオン交換能があり、特にセシウムイオンのイオン交換能優先順位が高い。そのため、汚染水６１が顆粒状ゼオライト１１Ｄの層を通過する際に、汚染水６１に含まれる放射性セシウムイオンが顆粒状ゼオライト１１Ｄに吸着する。したがって、汚染水処理ユニット２を通過してパイプ４３に流出する処理水６２は、汚染水６１よりも放射性セシウムイオンの量が少なくなる。   The contaminated water 61 flowing into the contaminated water treatment unit 2 through the pipe 42 passes through the presser foot 12A and the first water-permeable member 11B, and then passes through the granular zeolite 11D layer. Zeolite is a kind of aluminosilicate that incorporates cations such as sodium ions in the crystal structure. In addition, zeolite has a cation exchange capacity, and in particular, the ion exchange capacity priority of cesium ions is high. Therefore, when the contaminated water 61 passes through the granular zeolite 11D layer, the radioactive cesium ions contained in the contaminated water 61 are adsorbed on the granular zeolite 11D. Therefore, the amount of radioactive cesium ions in the treated water 62 passing through the contaminated water treatment unit 2 and flowing out to the pipe 43 is smaller than that in the contaminated water 61.

本願発明者は、セシウム１３３（１３３Ｃｓ）の陽イオンを含む水に対するセシウムイオンの除去率から、本実施の形態の汚染水処理ユニット２における放射性セシウムイオンの除去能力を見積もった。その結果、放射能濃度が３０００Ｂｑ／ｋｇ相当の汚染水６１は、本実施の形態の汚染水処理ユニット２を通過することで、放射能濃度が約２００Ｂｑ／ｋｇに低下することが確認された。なお、汚染水処理ユニット２は、フィルタ部１１を直径１０ｃｍ及び厚さ５ｃｍの円柱状にし、約３０ｇの顆粒状ゼオライト１１Ｄを充填したものを用いた。 This inventor estimated the removal ability of the radioactive cesium ion in the contaminated water processing unit 2 of this Embodiment from the removal rate of the cesium ion with respect to the water containing the cation of cesium 133 ( 133 Cs). As a result, it was confirmed that the contaminated water 61 having a radioactivity concentration of 3000 Bq / kg passes through the contaminated water treatment unit 2 of the present embodiment, and the radioactivity concentration is reduced to about 200 Bq / kg. The contaminated water treatment unit 2 was a filter unit 11 having a columnar shape with a diameter of 10 cm and a thickness of 5 cm and filled with about 30 g of granular zeolite 11D.

このように、本実施の形態の汚染水処理ユニット２は、顆粒状ゼオライト１１Ｄを充填したフィルタ部１１を備えることにより、汚染水６１から放射性セシウムイオンを容易に除去することができる。   Thus, the contaminated water treatment unit 2 according to the present embodiment can easily remove radioactive cesium ions from the contaminated water 61 by including the filter unit 11 filled with the granular zeolite 11D.

また、汚染水処理ユニット２で処理する汚染水６１は、凝集沈殿処理タンク１において除染廃液から微細粒子５を取り除いた水である。前述のように、除染廃液に含まれる放射性セシウムは、その大部分が微細粒子５に付着又は吸着している。そのため、汚染水６１の放射能濃度は、除染廃液の放射能濃度の約１／２００になる。したがって、凝集沈殿法と汚染水処理ユニット２とを併用することで、貯水タンク３に回収される処理水６２の放射能濃度を、除染廃液の放射能濃度の約１／３０００にすることができる。   The contaminated water 61 to be treated by the contaminated water treatment unit 2 is water obtained by removing the fine particles 5 from the decontamination waste liquid in the coagulation sedimentation treatment tank 1. As described above, most of the radioactive cesium contained in the decontamination waste liquid is attached to or adsorbed on the fine particles 5. Therefore, the radioactive concentration of the contaminated water 61 is about 1/200 of the radioactive concentration of the decontamination waste liquid. Therefore, by using the coagulation sedimentation method and the contaminated water treatment unit 2 together, the radioactive concentration of the treated water 62 recovered in the water storage tank 3 can be reduced to about 1/3000 of the radioactive concentration of the decontamination waste liquid. it can.

さらに、汚染水処理ユニット２を取り付けるパイプ４２、４３は、通常、ＪＩＳ規格に基づいて形成されている。すなわち、パイプ４２、４３は、管の内径やフランジ４２Ａ、４３Ａの寸法などが規格化されている。そのため、ケース部１０におけるフィルタ収容部１０Ａの内径やフランジ１０Ｂ、１０Ｃの寸法などをパイプ４２、４３の規格に合わせることにより、一般的な水処理設備に汚染水処理ユニット２を容易に取り付けることができる。   Furthermore, the pipes 42 and 43 to which the contaminated water treatment unit 2 is attached are usually formed based on the JIS standard. That is, the pipes 42 and 43 have standardized inner diameters of the pipes and dimensions of the flanges 42A and 43A. Therefore, the contaminated water treatment unit 2 can be easily attached to a general water treatment facility by adjusting the inner diameter of the filter housing portion 10A in the case portion 10 and the dimensions of the flanges 10B and 10C to the standards of the pipes 42 and 43. it can.

なお、本実施の形態では、第１の透水部材１１Ｂと第２の透水部材１１Ｃとの間に環状部材１１Ａを配置し、これらで構成される容器に顆粒状ゼオライト１１Ｄを充填している。しかしながら、汚染水処理ユニット２は、このような構成に限らず、環状部材１１Ａを用いない構成であってもよい。すなわち、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃをケース部１０に所定の間隔で配置し、その間に顆粒状ゼオライト１１Ｄを充填した構成でもよい。   In the present embodiment, an annular member 11A is disposed between the first water permeable member 11B and the second water permeable member 11C, and a granular zeolite 11D is filled in a container constituted by these members. However, the contaminated water treatment unit 2 is not limited to such a configuration, and may be a configuration that does not use the annular member 11A. That is, the 1st water-permeable member 11B and the 2nd water-permeable member 11C may be arrange | positioned in the case part 10 at predetermined intervals, and the structure filled with the granular zeolite 11D in the meantime may be sufficient.

（実施の形態２）
図４は、本発明の実施の形態２である汚染水処理ユニットの内部構成を示す断面図である。 (Embodiment 2)
FIG. 4 is a cross-sectional view showing the internal configuration of the contaminated water treatment unit according to Embodiment 2 of the present invention.

本実施の形態の汚染水処理ユニット２は、図４に示すように、ケース部１０と、フィルタ部１１と、一対の押さえ金物１２Ａ、１２Ｂとを備える。このうちケース部１０及び押さえ金物１２Ａ、１２Ｂは、実施の形態１で挙げたものと同じ構成である。そのため、ケース部１０及び押さえ金物１２Ａ、１２Ｂの説明は省略する。   As shown in FIG. 4, the contaminated water treatment unit 2 according to the present embodiment includes a case portion 10, a filter portion 11, and a pair of presser fittings 12 </ b> A and 12 </ b> B. Of these, the case portion 10 and the presser fittings 12A and 12B have the same configuration as that described in the first embodiment. Therefore, the description of the case part 10 and the presser hardware 12A, 12B is omitted.

フィルタ部１１は、図４に示すように、第１の透水部材１１Ｂと、第２の透水部材１１Ｃと、ゼオライト含有部材１１Ｆと、不織布フィルタ１１Ｅとを備える。このうち第１の透水部材１１Ｂ、第２の透水部材１１Ｃ、及び不織布フィルタ１１Ｅは、実施の形態１で挙げたものと同じ構成である。そのため、第１の透水部材１１Ｂ、第２の透水部材１１Ｃ、及び不織布フィルタ１１Ｅの説明は省略する。   As shown in FIG. 4, the filter unit 11 includes a first water permeable member 11B, a second water permeable member 11C, a zeolite-containing member 11F, and a nonwoven fabric filter 11E. Among these, the 1st water-permeable member 11B, the 2nd water-permeable member 11C, and the nonwoven fabric filter 11E are the same structures as what was mentioned in Embodiment 1. FIG. Therefore, description of the 1st water-permeable member 11B, the 2nd water-permeable member 11C, and the nonwoven fabric filter 11E is abbreviate | omitted.

ゼオライト含有部材１１Ｆは、ロックウールなどの繊維状物質を円板状に成形した基材に、粒状ゼオライトを定着させたものである。ゼオライト含有部材１１Ｆの基材は、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃと同様の透水性を持たせる。なお、粒状ゼオライトは、粉末状のゼオライトに微量のモンモリロナイトを添加し、繊維状物質の隙間に定着させている。これにより、ゼオライト含有部材１１Ｆの基材は、粒状ゼオライトを、汚染水６１と接触し、かつ基材からの流出を阻止する状態に保持する保持部材として機能する。   The zeolite-containing member 11F is obtained by fixing granular zeolite on a base material obtained by forming a fibrous material such as rock wool into a disk shape. The base material of the zeolite-containing member 11F has the same water permeability as the first water permeable member 11B and the second water permeable member 11C. The granular zeolite is fixed in a gap between the fibrous substances by adding a small amount of montmorillonite to the powdered zeolite. Thereby, the base material of the zeolite-containing member 11F functions as a holding member that holds the granular zeolite in a state of contacting the contaminated water 61 and preventing outflow from the base material.

本実施の形態の汚染水処理ユニット２を図１に示した汚染水処理システムに適用した場合、実施の形態１と同様の効果が期待できる。パイプ４２を通り汚染水処理ユニット２に流入した汚染水６１は、押さえ金物１２Ａ、第１の透水部材１１Ｂを通過した後、ゼオライト含有部材１１Ｆを通過する。このとき、汚染水６１に含まれる放射性セシウムイオンは、イオン交換によりゼオライトに吸着する。したがって、汚染水処理ユニット２を通過してパイプ４３に流出する処理水６２は、汚染水６１よりも放射性セシウムイオンの量が少なくなる。   When the contaminated water treatment unit 2 of the present embodiment is applied to the contaminated water treatment system shown in FIG. 1, the same effects as those of the first embodiment can be expected. The contaminated water 61 flowing into the contaminated water treatment unit 2 through the pipe 42 passes through the presser foot 12A and the first water permeable member 11B, and then passes through the zeolite-containing member 11F. At this time, radioactive cesium ions contained in the contaminated water 61 are adsorbed on the zeolite by ion exchange. Therefore, the amount of radioactive cesium ions in the treated water 62 passing through the contaminated water treatment unit 2 and flowing out to the pipe 43 is smaller than that in the contaminated water 61.

本願発明者は、セシウム１３３（１３３Ｃｓ）の陽イオンを含む水に対するセシウムイオンの除去率から、本実施の形態の汚染水処理ユニット２における放射性セシウムイオンの除去能力を見積もった。その結果、放射能濃度が３０００Ｂｑ／ｋｇ相当の汚染水６１は、本実施の形態の汚染水処理ユニット２を通過することで、放射能濃度が約４０Ｂｑ／ｋｇに低下することが確認された。なお、汚染水処理ユニット２は、フィルタ部１１を直径１０ｃｍ及び厚さ５ｃｍの円柱状にし、約３０ｇの粒状ゼオライトを基材に定着させたゼオライト含有部材１１Ｆを用いた。 This inventor estimated the removal ability of the radioactive cesium ion in the contaminated water processing unit 2 of this Embodiment from the removal rate of the cesium ion with respect to the water containing the cation of cesium 133 ( 133 Cs). As a result, it was confirmed that the contaminated water 61 having a radioactivity concentration equivalent to 3000 Bq / kg passes through the contaminated water treatment unit 2 of the present embodiment, and the radioactivity concentration is reduced to about 40 Bq / kg. The contaminated water treatment unit 2 used a zeolite-containing member 11F in which the filter unit 11 was formed into a columnar shape having a diameter of 10 cm and a thickness of 5 cm, and about 30 g of granular zeolite was fixed to the base material.

このように、本実施の形態の汚染水処理ユニット２は、繊維状物質を成形した基材に粒状ゼオライトを定着させたゼオライト含有部材１１Ｆを備えることにより、汚染水６１から放射性セシウムイオンを除去することができる。   As described above, the contaminated water treatment unit 2 of the present embodiment removes radioactive cesium ions from the contaminated water 61 by including the zeolite-containing member 11F in which granular zeolite is fixed to the base material on which the fibrous substance is molded. be able to.

また、汚染水処理ユニット２で処理する汚染水６１は、凝集沈殿処理タンク１において除染廃液から微細粒子５を取り除いた水である。前述のように、汚染水６１の放射能濃度は、除染廃液の放射能濃度の約１／２００である。したがって、凝集沈殿法と本実施の形態の汚染水処理ユニット２とを併用することで、貯水タンク３に回収される処理水６２の放射能濃度を、除染廃液の放射能濃度の約１／１４０００にすることができる。   The contaminated water 61 to be treated by the contaminated water treatment unit 2 is water obtained by removing the fine particles 5 from the decontamination waste liquid in the coagulation sedimentation treatment tank 1. As described above, the radioactive concentration of the contaminated water 61 is about 1/200 of the radioactive concentration of the decontamination waste liquid. Therefore, by using the coagulation sedimentation method and the contaminated water treatment unit 2 of the present embodiment in combination, the radioactivity concentration of the treated water 62 collected in the water storage tank 3 is reduced to about 1 / of the radioactivity concentration of the decontamination waste liquid. 14000.

さらに、汚染水処理ユニット２を取り付けるパイプ４２、４３は、通常、ＪＩＳ規格に基づいて形成されている。すなわち、パイプ４２、４３は、管の内径やフランジ４２Ａ、４３Ａの寸法などが規格化されている。そのため、ケース部１０におけるフィルタ収容部１０Ａの内径やフランジ１０Ｂ、１０Ｃの寸法などをパイプ４２、４３の規格に合わせることにより、一般的な水処理設備に汚染水処理ユニット２を容易に取り付けることができる。   Furthermore, the pipes 42 and 43 to which the contaminated water treatment unit 2 is attached are usually formed based on the JIS standard. That is, the pipes 42 and 43 have standardized inner diameters of the pipes and dimensions of the flanges 42A and 43A. Therefore, the contaminated water treatment unit 2 can be easily attached to a general water treatment facility by adjusting the inner diameter of the filter housing portion 10A in the case portion 10 and the dimensions of the flanges 10B and 10C to the standards of the pipes 42 and 43. it can.

なお、図４に示したフィルタ部１１は、ゼオライト含有部材１１Ｆの上流側及び下流側に、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃをそれぞれ配置している。しかしながら、フィルタ部１１は、このような構成に限らず、第１の透水部材１１Ｂ及び第２の透水部材１１Ｃにも粒状ゼオライトを定着させてもよい。   In addition, the filter part 11 shown in FIG. 4 arrange | positions the 1st water-permeable member 11B and the 2nd water-permeable member 11C in the upstream and downstream of the zeolite containing member 11F, respectively. However, the filter unit 11 is not limited to such a configuration, and granular zeolite may be fixed to the first water permeable member 11B and the second water permeable member 11C.

以上、本発明に係る汚染水処理ユニット２を、上記実施の形態に基づき具体的に説明した。しかしながら、本発明は、上記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは勿論である。   The contaminated water treatment unit 2 according to the present invention has been specifically described above based on the above embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the invention.

たとえば、本発明に係る汚染水処理ユニット２は、図１に示したような除染廃液処理システムに限らず、放射性セシウムイオンの除去が求められるさまざまな処理システムに適用できる。そのため、フィルタ部１１を収容するケース部１０の構成は、適用する処理システムにあわせて適宜変更可能である。   For example, the contaminated water treatment unit 2 according to the present invention is not limited to the decontamination waste liquid treatment system as shown in FIG. 1, and can be applied to various treatment systems that require removal of radioactive cesium ions. Therefore, the structure of the case part 10 which accommodates the filter part 11 can be suitably changed according to the processing system to apply.

１ 凝集沈殿処理タンク
２ 汚染水処理ユニット
３ 貯水タンク
４１，４２，４３，４４ パイプ
４２Ａ，４３Ａ フランジ
５ 微細粒子
６１ 汚染水
６２ 処理水
１０ ケース部
１０Ａ フィルタ収容部
１０Ｂ，１０Ｃ フランジ
１１ フィルタ部
１１Ａ 環状部材
１１Ｂ 第１の透水部材
１１Ｃ 第２の透水部材
１１Ｄ 顆粒状ゼオライト
１１Ｅ 不織布フィルタ
１１Ｆ ゼオライト含有部材
１２Ａ，１２Ｂ 押さえ金物 DESCRIPTION OF SYMBOLS 1 Coagulation sedimentation processing tank 2 Contaminated water processing unit 3 Reservoir tank 41, 42, 43, 44 Pipe 42A, 43A Flange 5 Fine particle 61 Contaminated water 62 Treated water 10 Case part 10A Filter accommodating part 10B, 10C Flange 11 Filter part 11A Annular Member 11B First water-permeable member 11C Second water-permeable member 11D Granular zeolite 11E Non-woven filter 11F Zeolite-containing member 12A, 12B Pressing metal

Claims (3)

放射性セシウムイオンを含む汚染水から前記放射性セシウムイオンを除去する汚染水処理ユニットであって、
複数の粒状ゼオライトを保持する保持部材を備え、
前記保持部材は、前記複数の粒状ゼオライトを、前記汚染水と接触し、かつ前記保持部材からの流出を阻止する状態に保持することを特徴とする汚染水処理ユニット。 A contaminated water treatment unit for removing radioactive cesium ions from contaminated water containing radioactive cesium ions,
A holding member for holding a plurality of granular zeolites;
The contaminated water treatment unit, wherein the holding member holds the plurality of granular zeolites in contact with the contaminated water and in a state of preventing outflow from the holding member. 前記保持部材は、前記複数の粒状ゼオライトを充填可能な内部空間を有する容器状を成し、
前記汚染水を前記内部空間に透水する第１の透水部と、粒状ゼオライト間を通過した水を前記保持部材の外部に透水する第２の透水部とを備えることを特徴とする請求項１に記載の汚染水処理ユニット。 The holding member has a container shape having an internal space capable of being filled with the plurality of granular zeolites,
The first water-permeable portion that allows the contaminated water to pass through the internal space, and a second water-permeable portion that allows water that has passed between the granular zeolites to flow to the outside of the holding member. Contaminated water treatment unit as described. 前記保持部材は、繊維状物質で形成された透水性を有する部材であり、
繊維状物質の隙間に粒状ゼオライトを定着させて保持することを特徴とする請求項１に記載の汚染水処理ユニット。 The holding member is a water-permeable member formed of a fibrous material,
2. The contaminated water treatment unit according to claim 1, wherein granular zeolite is fixed and held in the gap between the fibrous substances.
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