JP2015045624A - 放射性物質汚染水の処理方法 - Google Patents
放射性物質汚染水の処理方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/006—Radioactive compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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Abstract
【解決手段】放射性物質を含有する汚染水から界面前進凍結濃縮処理により前記放射性物質の濃度を低減させた氷を凍結させるとともに残余の汚染水にて前記放射性物質を濃縮させる凍結濃縮工程を有する放射性物質汚染水の処理方法である。前記凍結濃縮工程の前工程として、前記汚染水の酸素溶存量を低減するとともに窒素ガスを溶解させる窒素置換工程を有することが好適である。前記放射性物質として放射性セシウムに好適に適用できる。
【選択図】図1
Description
本発明の態様は、放射性物質を含有する汚染水から界面前進凍結濃縮処理により水を凍結させて前記放射性物質の濃度を低減させた氷を生成するとともに残余の汚染水にて前記放射性物質を濃縮させる凍結濃縮工程を有するものである。
まず、回収した汚染水を適宜のタンクなどに供給して貯水する貯水工程を行う(ステップS1)。次に、貯水した汚染水の酸素溶存量を低減して窒素ガスを溶解させる窒素置換工程を行う(ステップS2)。この窒素置換工程は、必須ではなく好適工程である。続いて、水の凍結温度に冷却された結氷面上に窒素置換された汚染水を流下させるように循環供給し、結氷面上に氷を層状に生成させる界面前進凍結濃縮処理を適用した凍結濃縮工程を行う(ステップS3)。水が凍結して氷を生成する際には、水溶性物質及び非水溶性物質を固相から液相に排除する作用がある。これにより、放射性物質の濃度を低減された氷が得られると同時に、残留する水溶液においては放射性物質が濃縮される。最後に、生成した氷を取り出すとともに、濃縮された残留汚染水を取り出す排出工程を行う(ステップS4)。
水温(℃) 酸素溶存量DO(mg/L)
0 14.6
10 10.9
20 8.8
図2に示した処理装置と同様の構成の処理装置であって、試験用の小規模の装置を用いて窒素置換試験を行った。
<試験方法>
貯水タンクに300リットルの原水(試験のため、水道水で行った)を充填し、エアコンプレッサ1の供給圧力0.2MPaで3時間半、窒素ガスを注入した。
時間 水温(℃) 酸素溶存量DO(mg/L)
開始時 : 8.4 4.99
1時間後 : 9.1 3.13
2時間後 : 9.6 3.02
3時間半後: 9.2 1.36
試験結果が示すように、窒素ガスを水中に注入することにより、水中の酸素溶存量は大きく減少する。
図2に示した処理装置を用いて、さらに別の窒素置換試験を行った。
<試験方法>
貯水タンク11に20,000リットルの原水(このテストでは塩分濃度3%の海水を用いた)を充填した。その後、窒素ガス生成器12の圧力0.2MPaの窒素ガスを8時間、原水に注入した。原水は冷凍機16により冷却された。その後、原水を3℃にて16時間半放置した。
時間 水温(℃) 酸素溶存量DO(mg/L)
開始時 : 20.6 5.21
1時間後 : 18.1 3.15
2時間後 : 15.6 1.85
3時間後 : 12.9 1.29
4時間後 : 10.6 1.09
5時間後 : 8.5 0.91
6時間後 : 6.5 0.84
7時間後 : 4.9 0.76
8時間後 : 3.2 0.70
試験結果が示すように、窒素ガスを海水中に注入することにより、海水中の酸素溶存量は大きく減少する。
12 窒素ガス生成器
12a 窒素ガス供給管
13 熱交換器
14 ポンプ
15 循環パイプ
16 冷却器
21 濃縮用貯水槽
22 ポンプ
23 循環パイプ
24 散水管
25 水切り板
26 水受け容器
26a 水溜まり部
26b 孔
31 冷凍機
32 冷媒供給管
33 結氷板
34 冷媒戻り管
35 ホットガス源
36 ホットガス供給管
37 熱交換器
L1 窒素置換汚染水
L2 濃縮汚染水
D 沈殿物
F 氷
V1〜V5 バルブ
Claims (3)
- 放射性物質を含有する汚染水から界面前進凍結濃縮処理により水を凍結させて前記放射性物質の濃度を低減させた氷を生成するとともに残余の汚染水にて前記放射性物質を濃縮させる凍結濃縮工程を有する、放射性物質汚染水の処理方法。
- 前記凍結濃縮工程の前工程として、前記汚染水の酸素溶存量を低減させるとともに窒素ガスを溶解させる窒素置換工程を有する、請求項1に記載の放射性物質汚染水の処理方法。
- 前記放射性物質が放射性セシウムである、請求項1又は2に記載の放射性物質汚染水の処理方法。
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JP2015045624A true JP2015045624A (ja) | 2015-03-12 |
JP5935782B2 JP5935782B2 (ja) | 2016-06-15 |
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FR (1) | FR3009301B1 (ja) |
Families Citing this family (8)
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WO2009123350A1 (ja) * | 2008-04-04 | 2009-10-08 | 株式会社 城 | 結晶ろ過の方法および装置 |
JP6236614B2 (ja) * | 2015-05-14 | 2017-11-29 | 株式会社昭和冷凍プラント | 窒素置換角氷製造システム及び製造方法 |
FR3036699B1 (fr) * | 2015-06-01 | 2019-05-24 | Nobuyoshi Morimoto | Procede de traitement de l'eau contaminee par rayonnement et procede de traitement de scellement de centrale nucleaire |
US9849409B2 (en) * | 2015-10-13 | 2017-12-26 | E. David Jones | Water reclaiming container |
KR102647818B1 (ko) * | 2017-10-06 | 2024-03-13 | 캔두 에너지 인코포레이티드 | 원자력 발전에서 유체를 여과하기 위한 방법 및 장치 |
CN112489846A (zh) * | 2020-11-26 | 2021-03-12 | 中国核动力研究设计院 | 含氯离子放射性废液处理系统及方法 |
CN112466486B (zh) * | 2020-12-03 | 2022-09-06 | 中广核工程有限公司 | 余热排出系统接入反应堆冷却剂系统的除氧方法 |
JP2024501443A (ja) * | 2020-12-09 | 2024-01-12 | アトキンス エナジー プロダクツ アンド テクノロジー エルエルシー | 放射性物質を含む流体を処理するシステムおよび方法 |
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FR3009301B1 (fr) | 2020-07-31 |
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