JP2015175742A - Radioactive contaminated water treatment device and treatment method - Google Patents

Radioactive contaminated water treatment device and treatment method Download PDF

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JP2015175742A
JP2015175742A JP2014052775A JP2014052775A JP2015175742A JP 2015175742 A JP2015175742 A JP 2015175742A JP 2014052775 A JP2014052775 A JP 2014052775A JP 2014052775 A JP2014052775 A JP 2014052775A JP 2015175742 A JP2015175742 A JP 2015175742A
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contaminated water
lead
silver
radioactive
chloride
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JP6258086B2 (en
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小川　尚樹
Naoki Ogawa
尚樹 小川
涼吉 ▲濱▼口
涼吉 ▲濱▼口
Ryokichi Hamaguchi
横山　裕
Yutaka Yokoyama
裕 横山
清水　義仁
Yoshihito Shimizu
義仁 清水
島田　隆
Takashi Shimada
隆 島田
俊 柴山
Takashi Shibayama
俊 柴山
和昌 須山
Kazumasa Suyama
和昌 須山
浩一 柿木
Koichi Kakinoki
浩一 柿木
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Mitsubishi Heavy Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a treatment device that removes chloride, at a low cost and a high level, from radioactive contaminated water comprising radioactive material and chloride.SOLUTION: The treatment device comprises lead addition means 2 for adding a lead compound to radioactive contaminated water PW comprising chloride to separate it into first contaminated water and lead chloride precipitate, and silver addition means 3 for adding a silver compound to the first contaminated water discharged from the lead addition means 2 to separate it into second contaminated water and silver chloride precipitate.

Description

本発明は、放射性汚染水から塩化物を除去するための処理装置および処理方法に関する。   The present invention relates to a processing apparatus and a processing method for removing chloride from radioactively contaminated water.

放射性物質を含む放射性汚染水は、貯蔵にあたり塩化物を除去することが好ましい。従来、例えば、特許文献１に記載の放射性廃液処理装置では、放射性廃液から塩素イオンを除去する脱塩素部として、硝酸銀や硫酸銀などを供給して反応させることで、塩化銀の沈殿を生成させて固相として除去することが示されている。   Radioactive contaminated water containing radioactive substances is preferably removed from chlorides during storage. Conventionally, for example, in the radioactive liquid waste treatment apparatus described in Patent Document 1, as a dechlorination unit that removes chlorine ions from the radioactive liquid waste, silver nitrate or silver sulfate is supplied and reacted to generate silver chloride precipitate. To be removed as a solid phase.

特開２０１３−１４８３６５号公報JP 2013-148365 A

特許文献１に記載の放射性廃液処理装置のように、銀化合物を添加して塩化銀の沈殿を生成することで高レベルで塩化物を除去することが可能である。その反面、銀は高価であるためランニングコストが増大する問題がある。   Like the radioactive liquid waste treatment apparatus described in Patent Document 1, it is possible to remove chloride at a high level by adding a silver compound to produce a silver chloride precipitate. On the other hand, since silver is expensive, there is a problem that the running cost increases.

本発明は上述した課題を解決するものであり、放射性物質および塩化物を含む放射性汚染水から低コストかつ高レベルで塩化物を除去することのできる放射性汚染水の処理装置および処理方法を提供することを目的とする。   This invention solves the subject mentioned above, and provides the processing apparatus and processing method of radioactive polluted water which can remove a chloride from the radioactive polluted water containing a radioactive substance and a chloride at low cost and a high level. For the purpose.

上述の目的を達成するために、第１の発明の放射性汚染水処理装置は、塩化物を含む放射性汚染水中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加手段と、前記鉛添加手段から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加手段と、を備えることを特徴とする。   In order to achieve the above-mentioned object, the radioactively contaminated water treatment apparatus according to the first aspect of the present invention is the addition of lead that separates the first contaminated water and the lead chloride precipitate by adding a lead compound to the radioactively contaminated water containing chloride. And a silver addition means for adding a silver compound to the first contaminated water discharged from the lead addition means and separating it into a second contaminated water and a silver chloride precipitate.

この放射性汚染水処理装置によれば、鉛添加手段で塩化物を粗く除去した後、銀添加手段で塩化物を高レベルで除去することで、高価な銀の使用量を低減することができる。この結果、塩化物を含む放射性汚染水から低コストかつ高レベルで塩化物を除去することができる。   According to this radioactively contaminated water treatment apparatus, the amount of expensive silver used can be reduced by removing chloride at a high level with the silver addition means after roughly removing the chloride with the lead addition means. As a result, chloride can be removed from radioactive contaminated water containing chloride at low cost and at a high level.

また、第２の発明の放射性汚染水処理装置は、第１の発明において、前記銀添加手段の後に、前記銀添加手段から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去手段を備えることを特徴とする。   Further, the radioactively contaminated water treatment apparatus according to the second invention is the first contaminated water according to the first invention, wherein hydrogen sulfide is added to the second contaminated water discharged from the silver adding means after the silver adding means. It is characterized by comprising a lead removing means for separating as lead sulfide from.

この放射性汚染水処理装置によれば、第二汚染水から硫化鉛として分離することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment apparatus, the separation of lead from the second contaminated water as lead sulfide makes it possible to suppress the mixing of lead into the secondary waste in consideration of the environment.

また、第３の発明の放射性汚染水処理装置は、第１または第２の発明において、前記鉛添加手段で分離された塩化鉛の沈殿物から鉛を回収する鉛回収手段を備えることを特徴とする。   Moreover, the radioactively contaminated water treatment device of the third invention is characterized in that, in the first or second invention, it comprises lead recovery means for recovering lead from the lead chloride precipitate separated by the lead addition means. To do.

この放射性汚染水処理装置によれば、塩化鉛の沈殿物から鉛を回収することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment device, by collecting lead from the lead chloride precipitate, it is possible to suppress the mixing of lead into the secondary waste in consideration of the environment.

また、第４の発明の放射性汚染水処理装置は、第１〜第３のいずれか一つの発明において、前記銀添加手段で分離された塩化銀の沈殿物から銀を回収する銀回収手段を備えることを特徴とする。   In addition, a radioactively contaminated water treatment apparatus according to a fourth aspect of the present invention includes, in any one of the first to third aspects of the invention, silver recovery means for recovering silver from the silver chloride precipitate separated by the silver addition means. It is characterized by that.

この放射性汚染水処理装置によれば、高価な銀を回収することで、銀を再利用することができる。   According to this radioactively contaminated water treatment apparatus, silver can be reused by collecting expensive silver.

また、第５の発明の放射性汚染水処理装置は、第１〜第４のいずれか一つの発明において、前記鉛添加手段から排出される塩化鉛を容器内の外周部に貯留し、当該塩化鉛の内部に前記銀添加手段から排出される排出物を収容する保管手段を備えることを特徴とする。   Moreover, the radioactive polluted water treatment apparatus of 5th invention is the 1st-4th invention. WHEREIN: The lead chloride discharged | emitted from the said lead addition means is stored in the outer peripheral part in a container, The said lead chloride It is characterized by comprising storage means for accommodating the waste discharged from the silver addition means.

この放射性汚染水処理装置によれば、放射線を遮蔽する鉛を容器内の外周部に貯留した内部に塩化銀の沈殿物を収容することで、保管にあたって放射性遮蔽機能を向上することができる。   According to this radioactively contaminated water treatment apparatus, the radioactive shielding function can be improved during storage by storing silver chloride precipitates in the lead stored in the outer periphery of the container in the container.

また、第６の発明の放射性汚染水処理装置は、第１〜第５のいずれか一つの発明において、前記鉛添加手段に導入される放射性汚染水または前記銀添加手段から排出される第二汚染水を濃縮する濃縮手段を備えることを特徴とする。   Moreover, the radioactive contamination water processing apparatus of 6th invention is the 2nd contamination discharged | emitted from the radioactive contamination water introduce | transduced into the said lead addition means or the said silver addition means in any one invention of 1st-5th. It comprises a concentration means for concentrating water.

この放射性汚染水処理装置によれば、放射性汚染水または第二汚染水を濃縮することで、汚染水量を低減でき、保管容積や保管場所を減少することができ、かつ後処理を容易化することができる。   According to this radioactively contaminated water treatment device, the amount of contaminated water can be reduced by concentrating the radioactively contaminated water or the second contaminated water, the storage volume and storage location can be reduced, and post-treatment can be facilitated. Can do.

また、第７の発明の放射性汚染水処理方法は、塩化物を含む放射性汚染水中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加工程と、前記鉛添加工程から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加工程と、を含むことを特徴とする。   Moreover, the radioactive contamination water processing method of 7th invention adds the lead compound to the radioactive contamination water containing a chloride, and separates into the 1st contamination water and the precipitation of lead chloride, The said lead addition process And a silver addition step of adding a silver compound to the first contaminated water discharged from the water to separate the second contaminated water into a silver chloride precipitate.

この放射性汚染水処理方法によれば、鉛添加工程で塩化物を粗く除去した後、銀添加工程で塩化物を高レベルで除去することで、高価な銀の使用量を低減することができる。この結果、塩化物を含む放射性汚染水から低コストかつ高レベルで塩化物を除去することができる。   According to this radioactively contaminated water treatment method, the amount of expensive silver used can be reduced by removing chloride at a high level in the silver addition step after roughly removing the chloride in the lead addition step. As a result, chloride can be removed from radioactive contaminated water containing chloride at low cost and at a high level.

また、第８の発明の放射性汚染水処理方法は、第７の発明において、前記銀添加工程の後に、前記銀添加工程から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去工程を含むことを特徴とする。   Further, the radioactively contaminated water treatment method of the eighth invention is the seventh contaminated water according to the seventh invention, wherein hydrogen sulfide is added to the second contaminated water discharged from the silver addition step after the silver addition step. Including a lead removal step of separating the lead as lead sulfide.

この放射性汚染水処理方法によれば、第二汚染水から硫化鉛として分離することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment method, separation from the second contaminated water as lead sulfide makes it possible to suppress the mixing of lead into the secondary waste in consideration of the environment.

また、第９の発明の放射性汚染水処理方法は、第７または第８の発明において、前記鉛添加工程で分離された塩化鉛の沈殿物から鉛を回収する鉛回収工程を含むことを特徴とする。   The method for treating radioactive contaminated water according to the ninth aspect of the invention is characterized in that, in the seventh or eighth aspect of the invention, the method includes a lead recovery step of recovering lead from the lead chloride precipitate separated in the lead addition step. To do.

この放射性汚染水処理方法によれば、塩化鉛の沈殿物から鉛を回収することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment method, by collecting lead from the lead chloride precipitate, it is possible to suppress the mixing of lead into the secondary waste in consideration of the environment.

また、第１０の発明の放射性汚染水処理方法は、第７〜第９のいずれか一つの発明において、前記銀添加工程で分離された塩化銀の沈殿物から銀を回収する銀回収工程を含むことを特徴とする。   Moreover, the radioactive polluted water treatment method of the tenth invention includes a silver recovery step of recovering silver from the silver chloride precipitate separated in the silver addition step in any one of the seventh to ninth inventions. It is characterized by that.

この放射性汚染水処理方法によれば、高価な銀を回収することで、銀を再利用することができる。   According to this radioactively contaminated water treatment method, silver can be reused by collecting expensive silver.

また、第１１の発明の放射性汚染水処理方法は、第７〜第１０のいずれか一つの発明において、前記鉛添加工程で分離された塩化鉛の沈殿物を容器内の外周部に貯留し、当該塩化鉛の沈殿物の内部に前記銀添加工程で分離された塩化銀の沈殿物を収容する保管工程を含むことを特徴とする。   Moreover, the radioactive polluted water treatment method according to the eleventh aspect of the invention is that in any one of the seventh to tenth aspects of the invention, the lead chloride precipitate separated in the lead addition step is stored in the outer periphery of the container, The method includes a storage step of storing the silver chloride precipitate separated in the silver addition step inside the lead chloride precipitate.

この放射性汚染水処理方法によれば、放射線を遮蔽する鉛を容器内の外周部に貯留した内部に塩化銀の沈殿物を収容することで、保管にあたって放射性遮蔽機能を向上することができる。   According to this radioactively contaminated water treatment method, the radioactive shielding function can be improved in storage by storing the silver chloride precipitate in the inside where lead shielding the radiation is stored in the outer periphery of the container.

また、第１２の発明の放射性汚染水処理方法は、第７〜第１１のいずれか一つの発明において、前記鉛添加工程に導入される放射性汚染水または前記銀添加工程から排出される第二汚染水を濃縮する濃縮工程を含むことを特徴とする。   Moreover, the radioactive contamination water treatment method of the twelfth aspect of the invention is the second contamination discharged from the radioactive contamination water introduced into the lead addition step or the silver addition step in any one of the seventh to eleventh aspects of the invention. It includes a concentration step for concentrating water.

この放射性汚染水処理方法によれば、放射性汚染水ＰＷまたは第二汚染水を濃縮することで、汚染水量を低減でき、保管容積や保管場所を減少することができ、かつ後処理を容易化することができる。   According to this radioactively contaminated water treatment method, by concentrating the radioactively contaminated water PW or the second contaminated water, the amount of contaminated water can be reduced, the storage volume and storage location can be reduced, and post-treatment is facilitated. be able to.

本発明によれば、放射性物質および塩化物を含む放射性汚染水から低コストかつ高レベルで塩化物を除去することができる。   According to the present invention, chloride can be removed at low cost and at a high level from radioactive polluted water containing radioactive substances and chloride.

図１は、本発明の実施形態に係る放射性汚染水処理装置の概略図である。FIG. 1 is a schematic view of a radioactive polluted water treatment apparatus according to an embodiment of the present invention. 図２は、本発明の実施形態に係る放射性汚染水処理装置における塩化物除去処理装置の構成図である。FIG. 2 is a configuration diagram of a chloride removal treatment apparatus in the radioactively contaminated water treatment apparatus according to the embodiment of the present invention. 図３は、本発明の実施形態に係る放射性汚染水処理装置における濃縮処理装置の構成図である。FIG. 3 is a configuration diagram of the concentration treatment device in the radioactively contaminated water treatment device according to the embodiment of the present invention. 図４は、本発明の実施形態に係る放射性汚染水処理システムの構成図である。FIG. 4 is a configuration diagram of the radioactively contaminated water treatment system according to the embodiment of the present invention.

以下に、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、この実施形態によりこの発明が限定されるものではない。また、下記実施形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

図１は、本実施形態に係る放射性汚染水処理装置の概略図である。本実施形態の放射性汚染水処理装置は、放射性物質を含み、かつ塩化物を含む放射性汚染水を、貯蔵にあたり処理するためのものである。本実施形態では、主として、図１に示すように、塩化物除去処理装置１を有する。また、本実施形態では、図１に示すように、濃縮処理装置１０１を有する。これら、塩化物除去処理装置１と濃縮処理装置１０１とは、その処理順序は、いずれが先であってもよい。   FIG. 1 is a schematic diagram of a radioactively contaminated water treatment apparatus according to this embodiment. The radioactively contaminated water treatment apparatus of this embodiment is for treating radioactively contaminated water containing radioactive substances and containing chlorides during storage. In the present embodiment, mainly, as shown in FIG. Moreover, in this embodiment, as shown in FIG. Any of the chloride removal processing apparatus 1 and the concentration processing apparatus 101 may be processed first.

まず、塩化物除去処理装置１について説明する。図２は、本実施形態に係る放射性汚染水処理装置における塩化物除去処理装置の構成図である。塩化物除去処理装置１は、放射性汚染水であって、具体的には濃縮処理装置１０１に導入される放射性汚染水ＰＷ、または濃縮処理装置１０１から排出される再濃縮汚染水ＰＷ２に含まれる塩化物を除去するものである。この塩化物除去処理装置１は、図中一点鎖線で区切られて示されている鉛添加手段２と銀添加手段３とを備えて構成されている。   First, the chloride removal processing apparatus 1 will be described. FIG. 2 is a configuration diagram of a chloride removal treatment apparatus in the radioactively contaminated water treatment apparatus according to the present embodiment. The chloride removal treatment apparatus 1 is radioactive contaminated water, and specifically, chloride contained in the radioactive contaminated water PW introduced into the concentration treatment apparatus 101 or the reconcentrated contaminated water PW2 discharged from the concentration treatment apparatus 101. The thing is removed. The chloride removal treatment apparatus 1 includes a lead addition means 2 and a silver addition means 3 which are shown as being separated by a one-dot chain line in the figure.

鉛添加手段２は、塩化物を含む放射性汚染水ＰＷに鉛化合物を添加して放射性汚染水（第一汚染水）ＰＷと塩化鉛の沈殿物に分離するものである。   The lead addition means 2 adds a lead compound to radioactive contaminated water PW containing chloride and separates it into radioactive contaminated water (first contaminated water) PW and lead chloride precipitates.

鉛添加手段２は、鉛添加部２１を有する。鉛添加部２１は、凝集沈殿槽２１ａおよび固液分離槽２１ｂで構成されている。   The lead addition means 2 has a lead addition part 21. The lead addition unit 21 includes a coagulation sedimentation tank 21a and a solid-liquid separation tank 21b.

凝集沈殿槽２１ａは、塩化物（Ｃｌ−）を含む放射性汚染水ＰＷに、鉛化合物である水酸化鉛（Ｐｂ（ＯＨ）２）または硝酸鉛（Ｐｂ（ＮＯ３）２）を加えて塩化鉛（ＰｂＣｌ２）の沈殿物を生成するものである。凝集沈殿槽２１ａは、汚染水貯留部（図示せず）に貯留された放射性汚染水ＰＷがポンプ２２で配管内を圧送されて導入される。また、凝集沈殿槽２１ａは、鉛化合物貯留部（図示せず）に貯留された鉛化合物がポンプ２３で配管内を圧送されて導入される。 The agglomeration sedimentation tank 21a adds lead hydroxide (Pb (OH) 2 ) or lead nitrate (Pb (NO 3 ) 2 ), which is a lead compound, to radioactive polluted water PW containing chloride (Cl − ) to lead chloride This produces a precipitate of (PbCl 2 ). In the coagulation sedimentation tank 21a, radioactive contaminated water PW stored in a contaminated water storage section (not shown) is pumped through the piping by a pump 22 and introduced. Further, in the coagulation sedimentation tank 21a, the lead compound stored in the lead compound storage section (not shown) is introduced by being pumped through the piping by the pump 23.

固液分離槽２１ｂは、凝集沈殿槽２１ａに連通され、塩化鉛の沈殿物と、放射性汚染水ＰＷとを分離するものである。分離された塩化鉛の沈殿物（ＰｂＣｌ２スラリー）は、脱水機２４に導入され、放射性汚染水ＰＷは銀添加手段３に導入される。 The solid-liquid separation tank 21b communicates with the coagulation sedimentation tank 21a, and separates the lead chloride precipitate from the radioactively contaminated water PW. The separated lead chloride precipitate (PbCl 2 slurry) is introduced into the dehydrator 24, and the radioactive contaminated water PW is introduced into the silver addition means 3.

なお、塩化鉛の沈殿物と、放射性汚染水ＰＷとを分離するにあたり、凝集沈殿以外に、高速凝集沈殿や凝集膜ろ過などであってもよい。   In addition, when separating the precipitate of lead chloride and the radioactive polluted water PW, high-speed coagulation sedimentation or coagulation membrane filtration may be used in addition to the coagulation sedimentation.

脱水機２４は、塩化鉛の沈殿物を脱水処理するものである。脱水機２４は、遠心脱水、フィルタプレス、ベルトプレスなどの形態がある。脱水された塩化鉛の沈殿物は塩化鉛の固体（ＰｂＣｌ２ケーキ）として後述の鉛回収手段２６に導入される。また、脱水機２４から排出される脱水は放射性汚染水ＰＷと共に鉛添加部２１に導入される。 The dehydrator 24 dehydrates the lead chloride precipitate. The dehydrator 24 may be in the form of centrifugal dewatering, filter press, belt press or the like. The dehydrated lead chloride precipitate is introduced into the lead recovery means 26 described later as a lead chloride solid (PbCl 2 cake). Further, the dehydration discharged from the dehydrator 24 is introduced into the lead addition unit 21 together with the radioactively contaminated water PW.

鉛回収手段２６は、塩化鉛の沈殿物から鉛を回収するものである。鉛回収手段２６は、塩化鉛の固体を溶解し、鉛とその他の残留物とに分離し鉛を回収する。一方、残留物は、排出物として鉛添加手段２から排出され、後述の保管手段５で保管される。なお、鉛回収手段２６を有さない場合、脱水機２４で脱水された塩化鉛の沈殿物は塩化鉛の固体（ＰｂＣｌ２ケーキ）の排出物として鉛添加手段２から排出され、後述の保管手段５で保管される。 The lead recovery means 26 recovers lead from the lead chloride precipitate. The lead recovery means 26 dissolves lead chloride solid, separates it into lead and other residues, and recovers lead. On the other hand, the residue is discharged from the lead addition means 2 as discharge and stored in the storage means 5 described later. If the lead recovery means 26 is not provided, the lead chloride precipitate dehydrated by the dehydrator 24 is discharged from the lead addition means 2 as a lead chloride solid (PbCl 2 cake) discharge, which will be described later. Stored at 5.

また、銀添加手段３は、鉛添加手段２から排出される塩化物を含む放射性汚染水（第一汚染水）ＰＷに銀化合物を添加して放射性汚染水（第二汚染水）ＰＷと塩化銀の沈殿物に分離するものである。   In addition, the silver addition means 3 adds a silver compound to the radioactively contaminated water (first contaminated water) PW containing chloride discharged from the lead addition means 2 to add radioactive silver (second contaminated water) PW and silver chloride. It separates into the precipitates.

銀添加手段３は、銀添加部３１を有する。銀添加部３１は、凝集沈殿槽３１ａおよび固液分離槽３１ｂで構成されている。   The silver addition means 3 has a silver addition part 31. The silver addition part 31 is comprised by the coagulation sedimentation tank 31a and the solid-liquid separation tank 31b.

凝集沈殿槽３１ａは、塩化物（Ｃｌ−）を含む放射性汚染水（第一汚染水）ＰＷに、銀化合物である硝酸銀（ＡｇＮＯ３）または硫酸銀（Ａｇ２ＳＯ４）を加えて塩化銀（ＡｇＣｌ）の沈殿物を生成するものである。凝集沈殿槽３１ａは、鉛添加手段２から排出される放射性汚染水ＰＷがポンプ３２で配管内を圧送されて導入される。また、凝集沈殿槽３１ａは、銀化合物貯留部（図示せず）に貯留された銀化合物がポンプ３３で配管内を圧送されて導入される。 The coagulation sedimentation tank 31a adds silver nitrate (AgNO 3 ) or silver sulfate (Ag 2 SO 4 ), which is a silver compound, to radioactive contaminated water (first contaminated water) PW containing chloride (Cl − ) to add silver chloride ( AgCl) precipitate is produced. In the coagulation sedimentation tank 31a, the radioactive contaminated water PW discharged from the lead addition means 2 is introduced by being pumped through the piping by the pump 32. In addition, the silver compound stored in the silver compound storage section (not shown) is introduced into the coagulation sedimentation tank 31 a by being pumped through the pipe by the pump 33.

固液分離槽３１ｂは、凝集沈殿槽３１ａに連通され、塩化銀の沈殿物と、放射性汚染水ＰＷとを分離するものである。分離された塩化銀の沈殿物（ＡｇＣｌスラリー）は、脱水機３４に導入され、放射性汚染水（第二汚染水）ＰＷは鉛除去手段２５に導入される。   The solid-liquid separation tank 31b communicates with the coagulation sedimentation tank 31a and separates the silver chloride precipitate and the radioactively contaminated water PW. The separated silver chloride precipitate (AgCl slurry) is introduced into the dehydrator 34, and the radioactive contaminated water (second contaminated water) PW is introduced into the lead removing means 25.

なお、塩化銀の沈殿物と、放射性汚染水ＰＷとを分離するにあたり、凝集沈殿以外に、高速凝集沈殿や凝集膜ろ過などであってもよい。   In addition, when separating the silver chloride precipitate and the radioactively contaminated water PW, in addition to the aggregation precipitation, high-speed aggregation precipitation, aggregation membrane filtration, or the like may be used.

脱水機３４は、塩化銀の沈殿物を脱水処理するものである。脱水機３４は、遠心脱水、フィルタプレス、ベルトプレスなどの形態がある。脱水された塩化鉛の沈殿物は塩化銀の固体（ＡｇＣｌケーキ）として銀回収手段３５に導入される。また、脱水機３４から排出される脱水は放射性汚染水ＰＷと共に銀添加部３１に導入される。   The dehydrator 34 dehydrates the silver chloride precipitate. The dehydrator 34 may be in the form of centrifugal dehydration, filter press, belt press or the like. The dehydrated lead chloride precipitate is introduced into the silver recovery means 35 as a silver chloride solid (AgCl cake). Further, the dehydration discharged from the dehydrator 34 is introduced into the silver addition unit 31 together with the radioactive contaminated water PW.

銀回収手段３５は、塩化銀の沈殿物から銀を回収するものである。銀回収手段３５は、塩化銀の固体を溶解した後、電析により銀とその他の残留物とに分離し銀を回収する。一方、残留物は、排出物として銀添加手段３から排出され保管手段５で保管される。なお、銀回収手段３５を有さない場合、脱水機３４で脱水された塩化銀の沈殿物は塩化銀の固体（ＡｇＣｌケーキ）の排出物として銀添加手段３から排出され、保管手段５で保管される。   The silver recovery means 35 recovers silver from the silver chloride precipitate. The silver recovery means 35 dissolves the silver chloride solid and then separates it into silver and other residues by electrodeposition to recover the silver. On the other hand, the residue is discharged from the silver addition means 3 as discharge and stored in the storage means 5. If the silver recovery means 35 is not provided, the silver chloride precipitate dehydrated by the dehydrator 34 is discharged from the silver addition means 3 as a silver chloride solid (AgCl cake) discharge and stored in the storage means 5. Is done.

保管手段５は、鉛添加手段２において排出される塩化鉛の固体と、銀添加手段３から排出される排出物（残留物または塩化銀の固体）とを保管するものである。保管手段５では、塩化鉛の固体を容器内の外周部に貯留し、当該塩化鉛の固体の内部に排出物を収容する。   The storage unit 5 stores the lead chloride solid discharged from the lead addition unit 2 and the discharge (residue or silver chloride solid) discharged from the silver addition unit 3. In the storage means 5, lead chloride solid is stored in the outer periphery of the container, and the discharge is accommodated inside the lead chloride solid.

鉛除去手段２５は、先に鉛添加手段２で添加され、銀添加手段３から排出される放射性汚染水ＰＷ中に残存し得る鉛を除去するものである。鉛除去手段２５は、放射性汚染水ＰＷが導入される鉛除去槽に、硫化水素（Ｈ２Ｓ）を添加して硫化鉛（ＰｂＳ）の沈殿物を生成することで、鉛を除去する。硫化鉛（ＰｂＳ）は、鉛除去槽に設けたフィルタで除去される。そして、鉛を除去された放射性汚染水ＰＷは、後処理手段に導入される。なお、後処理手段とは、濃縮処理装置１０１や、塩化物が除去された放射性汚染水（第二汚染水）ＰＷを保管する保管処理手段（図示せず）などがある。 The lead removing means 25 removes lead that can be left in the radioactively contaminated water PW previously added by the lead adding means 2 and discharged from the silver adding means 3. The lead removing means 25 removes lead by adding hydrogen sulfide (H 2 S) to a lead removing tank into which radioactive polluted water PW is introduced to generate a precipitate of lead sulfide (PbS). Lead sulfide (PbS) is removed by a filter provided in the lead removal tank. And the radioactive polluted water PW from which lead was removed is introduced into the post-treatment means. The post-treatment means includes a concentration treatment apparatus 101 and a storage treatment means (not shown) for storing radioactive contaminated water (second contaminated water) PW from which chlorides have been removed.

このように、塩化物除去処理装置１は、鉛添加手段２で塩化物を除去した後、銀添加手段３でさらに塩化物を除去する。つまり、塩化鉛より塩化銀のほうが溶解度が小さいため、鉛添加手段２で塩化物を粗く除去した後、銀添加手段３で塩化物を高レベルで除去する。具体的に、放射性汚染水ＰＷに塩化物が１００００ｍｇ／Ｌ含まれているとした場合、鉛添加手段２では１０００ｍｇ／Ｌまで塩化物を除去でき、銀添加手段３では、１０ｍｇ／Ｌまで塩化物を除去できる。すなわち、銀添加手段３のほうが塩化物の除去性能が高い。しかし、銀添加手段３だけで１００００ｍｇ／Ｌから１０ｍｇ／Ｌまで塩化物を除去するには、１Ｌあたり３０ｇの銀を要する。一方、鉛添加手段２で塩化物を粗く除去しておけば（１００００ｍｇ／Ｌから１０００ｍｇ／Ｌまで塩化物を除去するのに１Ｌあたり５３ｇの鉛を要する）、その後に銀添加手段３で塩化物を高レベルで除去するのに１Ｌあたり３ｇの銀しか要さない。   As described above, the chloride removing apparatus 1 removes chloride by the lead addition means 2 and then further removes chloride by the silver addition means 3. That is, since the solubility of silver chloride is smaller than that of lead chloride, after the chloride is roughly removed by the lead addition means 2, the chloride is removed at a high level by the silver addition means 3. Specifically, assuming that the radioactive polluted water PW contains 10000 mg / L of chloride, the lead addition means 2 can remove chloride up to 1000 mg / L, and the silver addition means 3 can remove chloride up to 10 mg / L. Can be removed. That is, the silver addition means 3 has higher chloride removal performance. However, to remove chloride from 10000 mg / L to 10 mg / L with the silver addition means 3 alone, 30 g of silver is required per liter. On the other hand, if the chloride is roughly removed by the lead addition means 2 (53 g of lead per liter is required to remove chloride from 10000 mg / L to 1000 mg / L), then the chloride addition means 3 Only 3 g of silver per liter is required to remove at a high level.

次に、濃縮処理装置１０１について説明する。図３は、本実施形態に係る放射性汚染水処理装置における濃縮処理装置の構成図である。   Next, the concentration processing apparatus 101 will be described. FIG. 3 is a configuration diagram of the concentration treatment apparatus in the radioactively contaminated water treatment apparatus according to the present embodiment.

濃縮処理装置１０１は、図３に示すように、主構成として加熱器１０２と、蒸発器１０３と、圧縮機１０４と、を備える。   As shown in FIG. 3, the concentration processing apparatus 101 includes a heater 102, an evaporator 103, and a compressor 104 as main components.

加熱器１０２は、放射性汚染水ＰＷを加熱し、放射性汚染水を含む濃縮汚染水ＰＷ１と排水ＤＷとに分離するものである。放射性汚染水ＰＷは、貯留部（図示せず）に貯留され、汚染水ポンプ１０５で配管内を圧送されて加熱器１０２に導入される。加熱器１０２は、加熱容器内に過熱蒸気ＯＳおよび放射性汚染水ＰＷが導入され、過熱蒸気ＯＳで放射性汚染水ＰＷを加熱することで、放射性汚染水ＰＷを濃縮汚染水ＰＷ１と排水ＤＷとに分離する。濃縮汚染水ＰＷ１は、蒸発器１０３に導入され、排水ＤＷは、排水ポンプ１０６で配管内を圧送されて後述の排水側予熱器１０７に導入される。   The heater 102 heats the radioactively contaminated water PW and separates it into the concentrated contaminated water PW1 containing the radioactively contaminated water and the drainage DW. The radioactive contaminated water PW is stored in a storage unit (not shown), and is pumped through the piping by the contaminated water pump 105 and introduced into the heater 102. In the heater 102, the superheated steam OS and the radioactive contaminated water PW are introduced into the heating container, and the radioactive contaminated water PW is separated into the concentrated contaminated water PW1 and the drainage DW by heating the radioactive contaminated water PW with the superheated steam OS. To do. The concentrated contaminated water PW1 is introduced into the evaporator 103, and the drainage DW is pumped through the piping by the drainage pump 106 and introduced into the drainage side preheater 107 described later.

蒸発器１０３は、濃縮汚染水ＰＷ１を減圧して濃縮しつつフラッシュ蒸気ＦＳを抽出するものである。抽出されたフラッシュ蒸気ＦＳは、圧縮機１０４に導入され、濃縮汚染水ＰＷ１が濃縮された再濃縮汚染水ＰＷ２は、後述の再濃縮汚染水側予熱器１０８に導入される。   The evaporator 103 extracts the flash vapor FS while concentrating the concentrated contaminated water PW1 by reducing the pressure. The extracted flash steam FS is introduced into the compressor 104, and the reconcentrated contaminated water PW2 obtained by concentrating the concentrated contaminated water PW1 is introduced into the reconcentrated contaminated water side preheater 108 described later.

圧縮機１０４は、蒸発器１０３により抽出されたフラッシュ蒸気ＦＳを圧縮し加熱器１０２に導入する過熱蒸気ＯＳを生成するものである。すなわち、本実施形態において、加熱器１０２は、圧縮機１０４で圧縮された過熱蒸気ＯＳによって放射性汚染水ＰＷを加熱する。   The compressor 104 generates superheated steam OS that compresses the flash steam FS extracted by the evaporator 103 and introduces it into the heater 102. That is, in this embodiment, the heater 102 heats the radioactive polluted water PW with the superheated steam OS compressed by the compressor 104.

従って、この濃縮処理装置１０１によれば、圧縮機１０４において、蒸発器１０３により抽出されたフラッシュ蒸気ＦＳを圧縮し加熱器１０２に導入する過熱蒸気ＯＳを生成するため、ボイラを用いたり、ヒータを用いたりすることなく、過熱蒸気ＯＳが得られる。この結果、装置構成が簡素化され、かつ加熱にかかる燃料消費を低減できるため、放射性物質を含む放射性汚染水を低コストで濃縮することができる。   Therefore, according to the concentration processing apparatus 101, the compressor 104 compresses the flash steam FS extracted by the evaporator 103 and generates the superheated steam OS to be introduced into the heater 102. The superheated steam OS can be obtained without using it. As a result, since the apparatus configuration is simplified and the fuel consumption for heating can be reduced, the radioactive polluted water containing the radioactive substance can be concentrated at low cost.

また、加熱器１０２で分離された排水ＤＷが導入される排水側予熱器１０７は、加熱器１０２に導入される以前の放射性汚染水ＰＷが導入される。この排水側予熱器１０７は、加熱器１０２から排出される排水ＤＷと加熱器１０２に導入される以前の放射性汚染水ＰＷとを非接触で熱交換させることで放射性汚染水ＰＷを予熱する。排水側予熱器１０７で予熱に用いられた排水ＤＷは、濃縮処理装置１０１外に排出される。   Moreover, the waste water side preheater 107 into which the waste water DW separated by the heater 102 is introduced is introduced with the radioactively contaminated water PW before being introduced into the heater 102. The drain side preheater 107 preheats the radioactive contaminated water PW by exchanging heat between the waste water DW discharged from the heater 102 and the radioactive contaminated water PW before being introduced into the heater 102 in a non-contact manner. Drainage DW used for preheating in the drainage side preheater 107 is discharged out of the concentration treatment apparatus 101.

従って、この濃縮処理装置１０１によれば、排水側予熱器１０７により放射性汚染水ＰＷを予熱することで、加熱器１０２における放射性汚染水ＰＷの過熱効率を向上することができる。   Therefore, according to the concentration treatment apparatus 101, the preheating of the radioactive contaminated water PW by the drain side preheater 107 can improve the overheating efficiency of the radioactive contaminated water PW in the heater 102.

また、蒸発器１０３で再濃縮された再濃縮汚染水ＰＷ２が導入される再濃縮汚染水側予熱器１０８は、加熱器１０２に導入される以前の放射性汚染水ＰＷが導入される。この再濃縮汚染水側予熱器１０８は、蒸発器１０３から排出される再濃縮汚染水ＰＷ２と加熱器１０２に導入される以前の放射性汚染水ＰＷとを非接触で熱交換させることで放射性汚染水ＰＷを予熱する。再濃縮汚染水側予熱器１０８で予熱に用いられた再濃縮汚染水ＰＷ２は、濃縮処理装置１０１外に排出される。   Further, the reconcentrated contaminated water side preheater 108 into which the reconcentrated contaminated water PW2 reconcentrated in the evaporator 103 is introduced is introduced with the radioactive contaminated water PW before being introduced into the heater 102. The reconcentrated contaminated water side preheater 108 performs heat exchange in a non-contact manner between the reconcentrated contaminated water PW2 discharged from the evaporator 103 and the radioactive contaminated water PW before being introduced into the heater 102 in a non-contact manner. Preheat PW. The reconcentrated contaminated water PW2 used for preheating in the reconcentrated contaminated water side preheater 108 is discharged out of the concentration processing apparatus 101.

従って、この濃縮処理装置１０１によれば、再濃縮汚染水側予熱器１０８により放射性汚染水ＰＷを予熱することで、加熱器１０２における放射性汚染水ＰＷの過熱効率を向上することができる。   Therefore, according to the concentration treatment apparatus 101, the reconcentrated contaminated water side preheater 108 preheats the radioactive contaminated water PW, so that the superheat efficiency of the radioactive contaminated water PW in the heater 102 can be improved.

これら、排水側予熱器１０７と再濃縮汚染水側予熱器１０８とは、放射性汚染水ＰＷが汚染水ポンプ１０５で圧送されて加熱器１０２に導入される配管の途中に並列して設けられ、双方で放射性汚染水ＰＷを予熱する。   The drain side preheater 107 and the reconcentrated contaminated water side preheater 108 are provided in parallel in the middle of a pipe where the radioactive contaminated water PW is pumped by the contaminated water pump 105 and introduced into the heater 102. Preheat the radioactive contaminated water PW.

また、加熱器１０２から排出される排水ＤＷが排水ポンプ１０６で圧送される配管の途中に、フィルタ１０９が設けられている。本実施形態では、フィルタ１０９は、配管において排水ポンプ１０６と排水側予熱器１０７との間に設けられている。このフィルタ１０９は、活性炭などにより排水ＤＷに含まれる可能性がある放射性ヨウ素を除去する。   Further, a filter 109 is provided in the middle of a pipe through which the drainage DW discharged from the heater 102 is pumped by the drainage pump 106. In the present embodiment, the filter 109 is provided between the drain pump 106 and the drain side preheater 107 in the pipe. This filter 109 removes radioactive iodine that may be contained in the wastewater DW by activated carbon or the like.

従って、この濃縮処理装置１０１によれば、排水ＤＷから放射性ヨウ素を除去することで、排水ＤＷの取り扱いを安全に行うことができる。   Therefore, according to this concentration processing apparatus 101, the wastewater DW can be handled safely by removing radioactive iodine from the wastewater DW.

なお、加熱器１０２において、過熱蒸気ＯＳにより放射性汚染水ＰＷを加熱する際、濃縮汚染水ＰＷ１および排水ＤＷ以外に水蒸気Ｓが排出される。この水蒸気Ｓは、凝縮器１１０で冷却され、冷却された冷却水は加熱器１０２より排出された排水ＤＷに導入され、残ったオフガスＧは濃縮処理装置１０１外に排出される。   In the heater 102, when the radioactively contaminated water PW is heated by the superheated steam OS, the steam S is discharged in addition to the concentrated contaminated water PW1 and the drainage DW. The water vapor S is cooled by the condenser 110, the cooled cooling water is introduced into the drainage DW discharged from the heater 102, and the remaining offgas G is discharged out of the concentration processing apparatus 101.

従って、この濃縮処理装置１０１によれば、加熱器１０２において排出される水蒸気Ｓを凝縮させて排水ＤＷに導入することで、水蒸気Ｓに放射性物質が含まれている場合に、安全に処理することができる。   Therefore, according to the concentration treatment apparatus 101, the steam S discharged in the heater 102 is condensed and introduced into the drainage DW, so that when the radioactive material is contained in the steam S, it can be processed safely. Can do.

ところで、図４は、本実施形態に係る放射性汚染水処理システムの構成図である。放射性汚染水処理システムは、図３に示す濃縮処理装置１０１が、図４に示すように、汚染水処理モジュール１５１や排水処理モジュール１５２としてモジュール化され複合されることで構成されている。   By the way, FIG. 4 is a block diagram of the radioactive contamination water processing system which concerns on this embodiment. The radioactively contaminated water treatment system is configured by modularizing and concentrating the concentration treatment apparatus 101 shown in FIG. 3 as a contaminated water treatment module 151 and a wastewater treatment module 152 as shown in FIG.

汚染水処理モジュール１５１は、当該汚染水処理モジュール１５１を構成する濃縮処理装置１０１から排出される再濃縮汚染水ＰＷ２を処理する汚染水処理系統として複合されている。汚染水処理モジュール１５１は、複数（本実施形態では２つ）が順次連続して配置され、前段の汚染水処理モジュール１５１から排出される再濃縮汚染水ＰＷ２−１を、後段の汚染水処理モジュール１５１に放射性汚染水ＰＷとして導入する。すなわち、本実施形態に係る放射性汚染水処理システムでは、複数の汚染水処理モジュール１５１により、前段の汚染水処理モジュール１５１で放射性汚染水ＰＷを濃縮処理し、この濃縮された放射性汚染水ＰＷを後段の汚染水処理モジュール１５１でさらに濃縮処理する。   The contaminated water treatment module 151 is combined as a contaminated water treatment system for treating the re-concentrated contaminated water PW2 discharged from the concentration treatment apparatus 101 that constitutes the contaminated water treatment module 151. A plurality (two in this embodiment) of the contaminated water treatment modules 151 are sequentially arranged, and the reconcentrated contaminated water PW2-1 discharged from the previous contaminated water treatment module 151 is used as the subsequent contaminated water treatment module. 151 is introduced as radioactive polluted water PW. That is, in the radioactively contaminated water treatment system according to the present embodiment, the radioactively contaminated water PW is concentrated in the upstream contaminated water treatment module 151 by the multiple contaminated water treatment modules 151, and the concentrated radioactively contaminated water PW is converted into the subsequent stage. The contaminated water treatment module 151 performs further concentration treatment.

従って、この放射性汚染水処理システムによれば、放射性汚染水ＰＷを複数段階で濃縮することで、汚染水量をより低減でき、保管容積や保管場所を減少することができ、かつ後処理を容易化することができる。   Therefore, according to this radioactive contaminated water treatment system, the amount of contaminated water can be further reduced by concentrating the radioactive contaminated water PW in a plurality of stages, the storage volume and storage location can be reduced, and post-treatment is facilitated. can do.

また、汚染水処理系統において、放射性汚染水ＰＷに塩化物が含まれる場合は、初段の汚染水処理モジュール１５１と次段の汚染水処理モジュール１５１との間に、上述した塩化物除去処理装置（塩化物除去手段）１が配置される。つまり、塩化物除去処理装置１は、初段の汚染水処理モジュール１５１から排出される再濃縮汚染水ＰＷ２−１に含まれる塩化物を除去する。   Further, in the contaminated water treatment system, when the radioactive contaminated water PW contains chloride, the above-described chloride removal treatment apparatus (the above-described chloride water treatment module 151 (between the contaminated water treatment module 151 and the next contaminated water treatment module 151) A chloride removing means) 1 is arranged. That is, the chloride removal treatment device 1 removes chloride contained in the reconcentrated contaminated water PW2-1 discharged from the first-stage contaminated water treatment module 151.

従って、この放射性汚染水処理システムによれば、初段の汚染水処理モジュール１５１から排出される再濃縮汚染水ＰＷ２−１に含まれる塩化物を除去することで、次段の汚染水処理モジュール１５１における汚染水の濃縮度を向上し、保管容積や保管場所を減少することができる。   Therefore, according to this radioactive contaminated water treatment system, the chloride contained in the reconcentrated contaminated water PW2-1 discharged from the first-stage contaminated water treatment module 151 is removed, so that in the next-stage contaminated water treatment module 151 The concentration of contaminated water can be improved, and the storage volume and storage location can be reduced.

また、汚染水処理系統において、固体化モジュール１５３が配置されている。固体化モジュール１５３は、終段の汚染水処理モジュール１５１から排出される再濃縮汚染水ＰＷ２−２を乾燥させることで汚染物を固体化させて固体物ＰＳを得るものである。   Further, a solidification module 153 is disposed in the contaminated water treatment system. The solidification module 153 is to dry the reconcentrated contaminated water PW2-2 discharged from the final stage contaminated water treatment module 151 to solidify the contaminants to obtain a solid material PS.

従って、この放射性汚染水処理システムによれば、汚染物を固体化させることで、保管時の管理を容易化して安全性を向上することができる。   Therefore, according to this radioactively contaminated water treatment system, management during storage can be facilitated and safety can be improved by solidifying the contaminants.

排水処理モジュール１５２は、当該排水処理モジュール１５２を構成する濃縮処理装置１０１から排出される排水ＤＷを処理する排水処理系統として複合されている。排水処理モジュール１５２は、複数（本実施形態では３つ）が順次連続して配置され、前段の排水処理モジュール１５２から排出される排水ＤＷ−１，ＤＷ−２を、後段の排水処理モジュール１５２に放射性汚染水ＰＷとして導入する。すなわち、本実施形態に係る放射性汚染水処理システムでは、複数の排水処理モジュール１５２により、前段の排水処理モジュール１５２で放射性汚染水ＰＷを蒸留処理し、この蒸留により排出される排水ＤＷ−１，ＤＷ−２を後段の排水処理モジュール１５２でさらに蒸留処理する。   The waste water treatment module 152 is combined as a waste water treatment system for treating the waste water DW discharged from the concentration treatment apparatus 101 that constitutes the waste water treatment module 152. A plurality (three in the present embodiment) of the waste water treatment modules 152 are sequentially arranged, and the waste water DW-1 and DW-2 discharged from the front waste water treatment module 152 are replaced with the waste water treatment module 152 at the rear stage. Introduced as radioactive polluted water PW. That is, in the radioactively contaminated water treatment system according to the present embodiment, the radioactively contaminated water PW is distilled by the plurality of wastewater treatment modules 152 in the preceding wastewater treatment module 152, and the wastewaters DW-1 and DW discharged by this distillation are discharged. -2 is further subjected to distillation treatment by the waste water treatment module 152 at the subsequent stage.

従って、この放射性汚染水処理システムによれば、排水ＤＷを再蒸留することで、排水ＤＷの放射線量および保管量を減少することができる。   Therefore, according to this radioactively contaminated water treatment system, the radiation dose and the storage amount of the wastewater DW can be reduced by re-distilling the wastewater DW.

また、排水処理系統において、後段の排水処理モジュール１５２から排出される再濃縮汚染水ＰＷ２−３，ＰＷ２−４を、前段の排水処理モジュール１５２に導入される同等の放射線濃度の放射性汚染水ＰＷ、排水ＤＷ−１と共に導入する。すなわち、後段の排水処理モジュール１５２から排出される再濃縮汚染水ＰＷ２−３，ＰＷ２−４を、前段の排水処理モジュール１５２に戻して蒸留処理する。   Further, in the wastewater treatment system, the reconcentrated contaminated water PW2-3 and PW2-4 discharged from the subsequent wastewater treatment module 152 are converted into radioactive contaminated water PW having an equivalent radiation concentration introduced into the previous wastewater treatment module 152, It is introduced together with the drainage DW-1. That is, the reconcentrated contaminated water PW2-3 and PW2-4 discharged from the latter-stage wastewater treatment module 152 are returned to the former-stage wastewater treatment module 152 and subjected to distillation treatment.

従って、この放射性汚染水処理システムによれば、低濃度の汚染水を再蒸留することで、汚染水の放射線量および保管量を減少することができる。   Therefore, according to this radioactively contaminated water treatment system, it is possible to reduce the radiation dose and storage amount of contaminated water by redistilling low-concentration contaminated water.

また、排水処理系統において、汚染水処理系統の後段の汚染水処理モジュール１５１から排出される排水ＤＷ−４を、前段となる排水処理モジュール１５２に導入される同等の放射線濃度の放射性汚染水ＰＷと共に導入する。すなわち、汚染水処理モジュール１５１から排出される排水ＤＷ−４を、前段の排水処理モジュール１５２に導入して蒸留処理する。なお、後段の排水処理モジュール１５２から排出される排水ＤＷ−３は有害物質を含まないことを確認し放水する。   In the wastewater treatment system, the wastewater DW-4 discharged from the contaminated water treatment module 151 in the subsequent stage of the contaminated water treatment system is combined with the radioactive contaminated water PW having the same radiation concentration introduced into the wastewater treatment module 152 in the previous stage. Introduce. That is, the waste water DW-4 discharged from the contaminated water treatment module 151 is introduced into the preceding waste water treatment module 152 and subjected to a distillation treatment. In addition, it confirms that the waste water DW-3 discharged | emitted from the waste water treatment module 152 of a back | latter stage does not contain a harmful substance, and discharges water.

従って、この放射性汚染水処理システムによれば、低濃度の排水を再蒸留することで、排水の放射線量および保管量を減少することができる。   Therefore, according to this radioactively contaminated water treatment system, it is possible to reduce the radiation amount and storage amount of wastewater by re-distilling low-concentration wastewater.

また、排水処理系統において、汚染水処理系統が固体化モジュール１５３を備える場合、当該固体化モジュール１５３から排出される排水ＤＷ−５を、排水処理モジュール１５２に導入される同等の放射線濃度の放射性汚染水（排水ＤＷ−１）として導入する。すなわち、固体化モジュール１５３から排出される排水ＤＷ−５を、排水処理モジュール１５２に導入して蒸留処理する。   Further, in the wastewater treatment system, when the contaminated water treatment system includes the solidification module 153, the wastewater DW-5 discharged from the solidification module 153 is radioactively contaminated with the same radiation concentration introduced into the wastewater treatment module 152. Introduced as water (drainage DW-1). That is, the wastewater DW-5 discharged from the solidification module 153 is introduced into the wastewater treatment module 152 and distilled.

従って、この放射性汚染水処理システムによれば、排水を再蒸留することで、固体化モジュール１５３から排出される排水の放射線量および保管量を減少することができる。   Therefore, according to this radioactively contaminated water treatment system, the radiation amount and storage amount of the wastewater discharged from the solidification module 153 can be reduced by re-distilling the wastewater.

以上説明したように、本実施形態の放射性汚染水処理装置は、塩化物を含む放射性汚染水ＰＷ中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加手段２と、鉛添加手段２から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加手段３と、を備える。   As described above, the radioactively contaminated water treatment apparatus according to the present embodiment adds the lead compound to the radioactively contaminated water PW containing chloride and separates it into the first contaminated water and the lead chloride precipitate 2. And a silver addition means 3 for adding a silver compound to the first contaminated water discharged from the lead addition means 2 and separating it into a second contaminated water and a silver chloride precipitate.

また、本実施形態の放射性汚染水処理方法は、塩化物を含む放射性汚染水ＰＷ中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加工程と、鉛添加工程から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加工程と、を含む。   Moreover, the radioactively contaminated water treatment method of the present embodiment includes a lead addition step in which a lead compound is added to the radioactively contaminated water PW containing chloride and separated into first contaminated water and lead chloride precipitates, and a lead addition step. A silver addition step of adding a silver compound to the first contaminated water discharged from the water to separate the second contaminated water into a silver chloride precipitate.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、鉛添加手段２（鉛添加工程）で塩化物を粗く除去した後、銀添加手段３（銀添加工程）で塩化物を高レベルで除去することで、高価な銀の使用量を低減することができる。この結果、塩化物を含む放射性汚染水ＰＷから低コストかつ高レベルで塩化物を除去することができる。   According to this radioactively contaminated water treatment apparatus and radioactively contaminated water treatment method, after the chloride is roughly removed by the lead addition means 2 (lead addition process), the chloride is at a high level by the silver addition means 3 (silver addition process). By removing, the amount of expensive silver used can be reduced. As a result, chloride can be removed from the radioactively contaminated water PW containing chloride at a low cost and at a high level.

本実施形態の放射性汚染水処理装置は、銀添加手段３の後に、銀添加手段３から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去手段２５を備える。   The radioactively contaminated water treatment apparatus of the present embodiment includes a lead removing means for adding hydrogen sulfide to the second contaminated water discharged from the silver adding means 3 after the silver adding means 3 and separating it as lead sulfide from the second contaminated water. 25.

また、本実施形態の放射性汚染水処理方法は、銀添加工程の後に、銀添加工程から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去工程を含む。   Further, in the radioactively contaminated water treatment method of this embodiment, the lead removal step of adding hydrogen sulfide to the second contaminated water discharged from the silver addition step and separating it as lead sulfide from the second contaminated water after the silver addition step. including.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、第二汚染水から硫化鉛として分離することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment apparatus and radioactively contaminated water treatment method, by separating as lead sulfide from the second contaminated water, it is possible to suppress the mixing of lead into secondary waste in consideration of the environment. .

本実施形態の放射性汚染水処理装置は、鉛添加手段２で分離された塩化鉛の沈殿物から鉛を回収する鉛回収手段２６を備える。   The radioactively contaminated water treatment apparatus of this embodiment includes lead recovery means 26 that recovers lead from the lead chloride precipitate separated by the lead addition means 2.

また、本実施形態の放射性汚染水処理方法は、鉛添加工程で分離された塩化鉛の沈殿物から鉛を回収する鉛回収工程を含む。   Moreover, the radioactively contaminated water treatment method of the present embodiment includes a lead recovery step of recovering lead from the lead chloride precipitate separated in the lead addition step.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、塩化鉛の沈殿物から鉛を回収することで、環境に考慮して二次廃棄物中への鉛の混入を抑制することができる。   According to this radioactively contaminated water treatment apparatus and radioactively contaminated water treatment method, by collecting lead from the lead chloride precipitate, it is possible to suppress the mixing of lead into the secondary waste in consideration of the environment. .

本実施形態の放射性汚染水処理装置は、銀添加手段３で分離された塩化銀の沈殿物から銀を回収する銀回収手段３５を備える。   The radioactively contaminated water treatment apparatus of this embodiment includes a silver recovery unit 35 that recovers silver from the silver chloride precipitate separated by the silver addition unit 3.

また、本実施形態の放射性汚染水処理方法は、銀添加工程で分離された塩化銀の沈殿物から銀を回収する銀回収工程を含む。   Further, the radioactively contaminated water treatment method of the present embodiment includes a silver recovery step of recovering silver from the silver chloride precipitate separated in the silver addition step.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、高価な銀を回収することで、銀を再利用することができる。   According to this radioactively contaminated water treatment apparatus and radioactively contaminated water treatment method, silver can be reused by collecting expensive silver.

本実施形態の放射性汚染水処理装置は、鉛添加手段２から排出される塩化鉛を容器内の外周部に貯留し、当該塩化鉛の内部に銀添加手段３から排出される排出物を収容する保管手段５を備える。   The radioactively contaminated water treatment apparatus of the present embodiment stores lead chloride discharged from the lead addition means 2 in the outer periphery of the container, and accommodates the discharge discharged from the silver addition means 3 inside the lead chloride. Storage means 5 is provided.

また、本実施形態の放射性汚染水処理方法は、鉛添加工程で分離された塩化鉛の沈殿物を容器内の外周部に貯留し、当該塩化鉛の沈殿物の内部に銀添加工程で分離された塩化銀の沈殿物を収容する保管工程を含む。   In the radioactively contaminated water treatment method of the present embodiment, the lead chloride precipitate separated in the lead addition step is stored in the outer periphery of the container, and separated in the lead chloride precipitate in the silver addition step. A storage step for containing the silver chloride precipitate.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、放射線を遮蔽する鉛を容器内の外周部に貯留した内部に塩化銀の沈殿物を収容することで、保管にあたって放射性遮蔽機能を向上することができる。   According to this radioactively contaminated water treatment device and radioactively contaminated water treatment method, the radioactive shielding function is improved in storage by storing silver chloride precipitates inside the container where lead for shielding radiation is stored in the outer periphery of the container. can do.

本実施形態の放射性汚染水処理装置は、鉛添加手段２に導入される放射性汚染水ＰＷまたは銀添加手段３から排出される第二汚染水を濃縮する濃縮処理手段（濃縮手段）１０１を備える。   The radioactive contaminated water treatment apparatus of this embodiment includes a concentration treatment means (concentration means) 101 for concentrating the radioactive contaminated water PW introduced into the lead addition means 2 or the second contaminated water discharged from the silver addition means 3.

また、本実施形態の放射性汚染水処理方法は、鉛添加工程に導入される放射性汚染水または銀添加工程から排出される第二汚染水を濃縮する濃縮工程を含む。   Moreover, the radioactive contaminated water processing method of this embodiment includes the concentration process which concentrates the 2nd contaminated water discharged | emitted from the radioactive contaminated water introduced into a lead addition process, or a silver addition process.

この放射性汚染水処理装置および放射性汚染水処理方法によれば、放射性汚染水ＰＷまたは第二汚染水を濃縮することで、汚染水量を低減でき、保管容積や保管場所を減少することができ、かつ後処理を容易化することができる。   According to this radioactively contaminated water treatment apparatus and radioactively contaminated water treatment method, the amount of contaminated water can be reduced by concentrating the radioactively contaminated water PW or the second contaminated water, the storage volume and storage location can be reduced, and Post-processing can be facilitated.

１ 塩化物除去処理装置
２ 鉛添加手段
３ 銀添加手段
５ 保管手段
２１ 鉛添加部
２１ａ 凝集沈殿槽
２１ｂ 固液分離槽
２２ ポンプ
２３ ポンプ
２４ 脱水機
２５ 鉛除去手段
２６ 鉛回収手段
３１ 銀添加部
３１ａ 凝集沈殿槽
３１ｂ 固液分離槽
３２ ポンプ
３３ ポンプ
３４ 脱水機
３５ 銀回収手段
１０１ 濃縮処理装置 DESCRIPTION OF SYMBOLS 1 Chloride removal processing apparatus 2 Lead addition means 3 Silver addition means 5 Storage means 21 Lead addition part 21a Coagulation sedimentation tank 21b Solid-liquid separation tank 22 Pump 23 Pump 24 Dehydrator 25 Lead removal means 26 Lead recovery means 31 Silver addition part 31a Coagulation sedimentation tank 31b Solid-liquid separation tank 32 Pump 33 Pump 34 Dehydrator 35 Silver recovery means 101 Concentration processor

Claims (12)

塩化物を含む放射性汚染水中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加手段と、
前記鉛添加手段から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加手段と、
を備えることを特徴とする放射性汚染水処理装置。 A lead addition means for adding lead compound to radioactive contaminated water containing chloride and separating it into first contaminated water and lead chloride precipitate;
A silver addition means for adding a silver compound to the first contaminated water discharged from the lead addition means to separate the second contaminated water and a silver chloride precipitate;
A radioactively contaminated water treatment apparatus comprising: 前記銀添加手段の後に、前記銀添加手段から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去手段を備えることを特徴とする請求項１に記載の放射性汚染水処理装置。   The lead removal means for adding hydrogen sulfide to the second contaminated water discharged from the silver addition means and separating it from the second contaminated water as lead sulfide is provided after the silver addition means. The radioactive contaminated water treatment apparatus as described. 前記鉛添加手段で分離された塩化鉛の沈殿物から鉛を回収する鉛回収手段を備えることを特徴とする請求項１または２に記載の放射性汚染水処理装置。   The radioactive polluted water treatment apparatus according to claim 1, further comprising lead recovery means for recovering lead from the lead chloride precipitate separated by the lead addition means. 前記銀添加手段で分離された塩化銀の沈殿物から銀を回収する銀回収手段を備えることを特徴とする請求項１〜３のいずれか一つに記載の放射性汚染水処理装置。   The radioactive polluted water treatment apparatus according to any one of claims 1 to 3, further comprising a silver recovery unit that recovers silver from the silver chloride precipitate separated by the silver addition unit. 前記鉛添加手段から排出される塩化鉛を容器内の外周部に貯留し、当該塩化鉛の内部に前記銀添加手段から排出される排出物を収容する保管手段を備えることを特徴とする請求項１〜４のいずれか一つに記載の放射性汚染水処理装置。   The lead chloride discharged from the lead addition means is stored in an outer peripheral portion in a container, and the storage means for storing the discharge discharged from the silver addition means in the lead chloride is provided. The radioactive contamination water processing apparatus as described in any one of 1-4. 前記鉛添加手段に導入される放射性汚染水または前記銀添加手段から排出される第二汚染水を濃縮する濃縮手段を備えることを特徴とする請求項１〜５のいずれか一つに記載の放射性汚染水処理装置。   The radioactivity according to any one of claims 1 to 5, further comprising a concentration means for concentrating the radioactive contaminated water introduced into the lead addition means or the second contaminated water discharged from the silver addition means. Contaminated water treatment equipment. 塩化物を含む放射性汚染水中に鉛化合物を添加して第一汚染水と塩化鉛の沈殿物に分離する鉛添加工程と、
前記鉛添加工程から排出される第一汚染水中に銀化合物を添加して第二汚染水と塩化銀の沈殿物に分離する銀添加工程と、
を含むことを特徴とする放射性汚染水処理方法。 A lead addition process in which lead compounds are added to radioactive contaminated water containing chloride and separated into first contaminated water and lead chloride precipitate;
A silver addition step in which a silver compound is added to the first contaminated water discharged from the lead addition step and separated into a second contaminated water and a silver chloride precipitate;
A method for treating radioactive polluted water, comprising: 前記銀添加工程の後に、前記銀添加工程から排出される第二汚染水中に硫化水素を添加して第二汚染水から硫化鉛として分離する鉛除去工程を含むことを特徴とする請求項７に記載の放射性汚染水処理方法。   The method according to claim 7, further comprising a lead removal step of adding hydrogen sulfide to the second contaminated water discharged from the silver addition step and separating it as lead sulfide from the second contaminated water after the silver addition step. The radioactive contamination water treatment method as described. 前記鉛添加工程で分離された塩化鉛の沈殿物から鉛を回収する鉛回収工程を含むことを特徴とする請求項７または８に記載の放射性汚染水処理方法。   The radioactive polluted water treatment method according to claim 7 or 8, further comprising a lead recovery step of recovering lead from the lead chloride precipitate separated in the lead addition step. 前記銀添加工程で分離された塩化銀の沈殿物から銀を回収する銀回収工程を含むことを特徴とする請求項７〜９のいずれか一つに記載の放射性汚染水処理方法。   The radioactive contaminated water treatment method according to any one of claims 7 to 9, further comprising a silver recovery step of recovering silver from the silver chloride precipitate separated in the silver addition step. 前記鉛添加工程で分離された塩化鉛の沈殿物を容器内の外周部に貯留し、当該塩化鉛の沈殿物の内部に前記銀添加工程で分離された塩化銀の沈殿物を収容する保管工程を含むことを特徴とする請求項７〜１０のいずれか一つに記載の放射性汚染水処理方法。   A storage step of storing the lead chloride precipitate separated in the lead addition step in the outer periphery of the container, and storing the silver chloride precipitate separated in the silver addition step inside the lead chloride precipitate The method for treating radioactive contaminated water according to any one of claims 7 to 10, wherein: 前記鉛添加工程に導入される放射性汚染水または前記銀添加工程から排出される第二汚染水を濃縮する濃縮工程を含むことを特徴とする請求項７〜１１のいずれか一つに記載の放射性汚染水処理方法。   The radioactivity according to any one of claims 7 to 11, further comprising a concentration step of concentrating the radioactive contaminated water introduced into the lead addition step or the second contaminated water discharged from the silver addition step. Contaminated water treatment method.
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