JP2017125785A - 放射性物質汚染粒状物質の除染方法 - Google Patents
放射性物質汚染粒状物質の除染方法 Download PDFInfo
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- JP2017125785A JP2017125785A JP2016005753A JP2016005753A JP2017125785A JP 2017125785 A JP2017125785 A JP 2017125785A JP 2016005753 A JP2016005753 A JP 2016005753A JP 2016005753 A JP2016005753 A JP 2016005753A JP 2017125785 A JP2017125785 A JP 2017125785A
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- radioactive
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- cesium
- radioactive material
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- PVGBHEUCHKGFQP-UHFFFAOYSA-N sodium;n-[5-amino-2-(4-aminophenyl)sulfonylphenyl]sulfonylacetamide Chemical compound [Na+].CC(=O)NS(=O)(=O)C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=C1 PVGBHEUCHKGFQP-UHFFFAOYSA-N 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
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Abstract
Description
特許文献3に記載されている抽出薬品溶液は、塩化第一鉄、塩化第二鉄、硫酸第一鉄、硫酸第二鉄、硝酸第一鉄、硝酸第二鉄及びポリ硫酸鉄の鉄塩、並びにアンモニウム塩、カリウム塩の塩化化合物である。この抽出液は、更に塩化セシウム、グリセリン又はエチレングリコールモノエチルエーテル(EGME:セロソルブ)にて処理される。
(2)前記ペーパースラッジからなる多孔質粒状炭化焼成物の製造工程には、ヨウ化カリウム(KI)溶液への含浸工程が含まれない場合、TEDAの溶液への含浸工程が含まれない場合、KIとTEDAとの混合物の溶液への含浸工程も含まれない場合、のいずれであってもよい。
(3)前記放射性物質汚染土壌は、放射性セシウム134及び137の合計濃度が800Bq/kg以上を含有する。
(4)前記放射性物質汚染土壌に拡散又は混合する前記ペーパースラッジからなる多孔質粒状炭化焼成物の添加量は、0.1〜6kg/m2(0.5〜50kg/m3)(乾土の0.1〜6重量%)、望ましくは1.0〜3.5kg/m2(8〜30kg/m3)(乾土の0.9〜3.3重量%)である。
(5)前記ペーパースラッジは、水分量50〜85%を有し、このペーパースラッジを造粒し、乾燥した後、乾留温度500〜1300℃、望ましくは700〜1200℃の還元炭化焼成炉で炭化焼成する。さらに望ましくは、800〜1100℃で炭化焼成する。
(6)前記ペーパースラッジからなる多孔質粒状炭化焼成物は、絶乾重量で、可燃分(炭素を含む):15〜25%、TiO2:0.5〜3.0%、Na2O:0.0001〜0.0005%、K2O:0.0001〜0.0005%、SiO2:15〜35%、Al2O3:8〜20%、Fe2O3:5〜15%、CaO:15〜30%、MgO:1〜8%、その他(不純物):0.5〜3.0%を含み、これらの合計が100%であり、JIS-C2141による吸水率が100〜160%、BET吸着法による比表面積が80〜150m2/gであり、連続気泡を有する。
(7)前記ペーパースラッジからなる多孔質粒状炭化焼成物は、容積空隙率が70%以上、空隙容積が1000mm3/g以上を有し、平均空隙半径が20〜60μmであり、全空隙容積に占める半径1μm以上の空隙が70%以上、長径が1〜10mmの球状、楕円状、円柱状等である混合物質であり、黒色である。
この放射性物質汚染粒状物質の除染方法は、塩化カリウム、硫酸マグネシウム、硫酸銅を含浸された多孔質粒状炭化焼成物を使用する前に放射性物質汚染粒状物質は、分散剤と混合する前処理工程を行い、粒状物質の成分を十分に分散させ、あるいは粒状物質の粘土の非拡張層と拡張層の間を膨潤させる。例として、土壌の場合には、分散剤を土壌に撒いてよく混合し、粘土が砂、シルト等から十分に離れ、さらに粘土の非拡張層と拡張層の間を膨潤させた後、塩化カリウム、硫酸マグネシウム、硫酸銅を含浸された多孔質粒状炭化焼成物を再び土壌に撒いてよく混合することにより、放射性物質汚染土壌の放射性セシウム134及び137とのイオン交換性を更に向上させるものである。
現在では、フレイドエッジサイトでのセシウム吸着の拡散反応は実験的に確認された(Man,C.K.,Chu,P.Y.,2004.Experimental and modelling studies of radiocesium retention in soils. J Radioanal Nucl Chem 262:339−344)。さらに、フレイドエッジサイトでの拡散反応の速度は、0.009exp(−4×10−5.t)(s−1)と算出され、ここでの反応時間t は秒である(Ohnuki,T.,1994.Sorption characteristics of cesium on sandy soils and their components.Radiochim.Acta 65,75−80)。
放射性物質汚染土壌(80g、絶乾(OD:oven dried)重量)、5%KCl−PSC(20g、OD重量)の順でポリエチレン袋に入れ、よく混合し、25℃で、10日間放置した後、放射性セシウム134及び137を測定した。放射性物質汚染土壌の放射性セシウム134及び137は、厚生労働省「緊急時における食品の放射線測定マニュアル」、文部科学省「ゲルマニウム半導体検出器によるγ線スペクトロメトリー」を基に、Canberra製同軸型ゲルマニウム検出器で測定した。
1%MgSO4−PSC及び1%CuSO4−PSCにおいても、5%KCl−PSCと同様な手順で実験を行った。その結果を図3に示す。
放射性物質汚染土壌(80g、OD重量)、ヘキサメタリン酸ナトリウム(SHMP)の5%、10%、20%(土壌重量に対する%)の3水準でポリエチレン袋に入れ、よく混合し、25℃で、2日間放置した。その後、5%KCl−PSC、1%MgSO4−PSC、1%CuSO4−PSC(各20g、OD重量)を各SHMP水準のポリエチレン袋に添加し、再びよく混合し、25℃で、10日間放置した後、放射性セシウム134及び137を測定した。その結果を図3に示す。
また、放射性物質汚染土壌をヘキサメタリン酸ナトリウム(SHMP)と混合させ、前処理することにより、5%KCl−PSC、1%MgSO4−PSC及び1%CuSO4−PSCの除染率は、前処理をしていない5%KCl−PSC、1%MgSO4−PSC及び1%CuSO4−PSCの除染率よりも上がった。SHMPの添加率が5〜20%の範囲では、添加率10%で前処理したものが、最も高い除染率を示し、5%KCl−PSC、1%MgSO4−PSC、1%CuSO4−PSCの除染率は、全て約1.4倍増加した。特に、5%KCl−PSCの除染率が最も高く、約60%であった。これらの結果より、SHMPは土壌の粘土、砂、シルト等を分散したあるいは粘土の非拡張層と拡張層の間を広がれ、または分解/分裂されたと考えられる。
放射性物質汚染粒状物質を含む土壌を用い、各10%の、ヘキサメタリン酸ナトリウム(SHMP)、トリポリリン酸ナトリウム(STPP)、テトラピロリン酸ナトリウム(TSPP)で前処理を行った後、5%KCl−PSC、1%MgSO4−PSC、1%CuSO4−PSCと混合(除染)し、放射性セシウム134及び137を測定した。実験方法は、実施例1と同様に行い、その結果を図4に示す。
PSCと放射性物質汚染土壌との混合時において、放射性物質汚染土壌に含まれる放射性セシウム134及び137等の放射性物質のPSCへの影響を、ラボテストにて調査した。この試験では、2012年夏に福島県飯舘村で採取した放射性物質汚染土壌(100g、OD)をポリエチレン袋に入れ、メシュ袋に入れたPSC(10g、OD)を放射性物質汚染土壌に埋設し、25℃で10日間放置した。一方、ブランク試験では、同放射性物質汚染土壌(100g、OD)とPSC(10g、OD)とをポリエチレン袋に入れてよく混ぜた後、同じ条件下で試験を行った。放射性物質汚染土壌、PSCの各々の放射性セシウム134及び137、pH、イオン交換容量(CEC:cation exchange capacity)、汚染前後のPSCの金属組成を測定した。放射性物質汚染土壌及びPSCの品質結果を表1および図5に示し、汚染前後のPSCの金属組成を表2に示す。なお、2011年3月11日に起きた東日本大震災における原子力発電所事故により、福島県では一部の土壌に放射性物質汚染粒状物質が含まれている。
Claims (3)
- 放射性物質汚染粒状物質をリン酸ナトリウム系の分散剤と混合する前処理工程と、
前記前処理工程を行った放射性物質汚染粒状物質を、ペーパースラッジからなる多孔質粒状炭化焼成物と混合することで、前記放射性物質汚染粒状物質の放射性セシウム134及び137を前記多孔質粒状炭化焼成物に取り込む除染工程と、を有する、
ことを特徴とする放射性物質汚染粒状物質の除染方法。 - 前記リン酸ナトリウム系の分散剤は、ヘキサメタリン酸ナトリウム、トリポリリン酸ナトリウム及びテトラピロリン酸ナトリウムの郡から選択される1又は2以上の化合物を含有する、
ことを特徴とする請求項1に記載の放射性物質汚染粒状物質の除染方法。 - イオン交換可能な、塩化カリウム、硫酸マグネシウム及び硫酸銅の郡から選択される1又は2以上の化合物を前記多孔質粒状炭化焼成物に含浸させ、
この多孔質粒状炭化焼成物と前記前処理工程を行った放射性物質汚染粒状物質とを混合し、前記放射性物質汚染粒状物質の前記放射性セシウム134及び137をイオン交換により、前記多孔質粒状炭化焼成物に取り込む、
ことを特徴とする請求項1又は請求項2に記載の放射性物質汚染粒状物質の除染方法。
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KR102452825B1 (ko) * | 2020-08-31 | 2022-10-12 | 한국원자력연구원 | 부식산화막 제염제 및 이를 이용한 부식산화막의 제염방법 |
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CA3003233C (en) | 2020-07-21 |
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US20180330838A1 (en) | 2018-11-15 |
US10706981B2 (en) | 2020-07-07 |
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JP6238214B2 (ja) | 2017-11-29 |
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