JP5946044B2 - 放射性物質汚染土壌の除染方法 - Google Patents
放射性物質汚染土壌の除染方法 Download PDFInfo
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- JP5946044B2 JP5946044B2 JP2014172150A JP2014172150A JP5946044B2 JP 5946044 B2 JP5946044 B2 JP 5946044B2 JP 2014172150 A JP2014172150 A JP 2014172150A JP 2014172150 A JP2014172150 A JP 2014172150A JP 5946044 B2 JP5946044 B2 JP 5946044B2
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- potassium
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- 239000002689 soil Substances 0.000 title claims description 94
- 239000012857 radioactive material Substances 0.000 title claims description 47
- 238000005202 decontamination Methods 0.000 title claims description 33
- 230000002285 radioactive effect Effects 0.000 claims description 104
- TVFDJXOCXUVLDH-OUBTZVSYSA-N cesium-134 Chemical compound [134Cs] TVFDJXOCXUVLDH-OUBTZVSYSA-N 0.000 claims description 43
- TVFDJXOCXUVLDH-RNFDNDRNSA-N cesium-137 Chemical compound [137Cs] TVFDJXOCXUVLDH-RNFDNDRNSA-N 0.000 claims description 41
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 30
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 26
- 238000005342 ion exchange Methods 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 239000001103 potassium chloride Substances 0.000 claims description 15
- 235000011164 potassium chloride Nutrition 0.000 claims description 15
- 239000000276 potassium ferrocyanide Substances 0.000 claims description 14
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 13
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 13
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 13
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 13
- 235000011151 potassium sulphates Nutrition 0.000 claims description 13
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 12
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 12
- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000000941 radioactive substance Substances 0.000 claims description 7
- 229910001510 metal chloride Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 235000002639 sodium chloride Nutrition 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 32
- 239000000047 product Substances 0.000 description 28
- 230000003588 decontaminative effect Effects 0.000 description 26
- -1 salt compound Chemical class 0.000 description 23
- 229910052792 caesium Inorganic materials 0.000 description 22
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 22
- 238000000034 method Methods 0.000 description 22
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 21
- 229910052700 potassium Inorganic materials 0.000 description 21
- 239000011591 potassium Substances 0.000 description 21
- 229910052742 iron Inorganic materials 0.000 description 16
- 235000012249 potassium ferrocyanide Nutrition 0.000 description 13
- 239000004698 Polyethylene Substances 0.000 description 12
- 229920000573 polyethylene Polymers 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000011777 magnesium Substances 0.000 description 11
- 229910052749 magnesium Inorganic materials 0.000 description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 239000011575 calcium Substances 0.000 description 10
- 229910052791 calcium Inorganic materials 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 229910052788 barium Inorganic materials 0.000 description 9
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 9
- 238000011109 contamination Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- FLJPGEWQYJVDPF-UHFFFAOYSA-L caesium sulfate Chemical compound [Cs+].[Cs+].[O-]S([O-])(=O)=O FLJPGEWQYJVDPF-UHFFFAOYSA-L 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 6
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010893 paper waste Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- NAVJNPDLSKEXSP-UHFFFAOYSA-N Fe(CN)2 Chemical class N#C[Fe]C#N NAVJNPDLSKEXSP-UHFFFAOYSA-N 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- OYPRJOBELJOOCE-IGMARMGPSA-N Calcium-40 Chemical compound [40Ca] OYPRJOBELJOOCE-IGMARMGPSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- KEAYESYHFKHZAL-IGMARMGPSA-N sodium-23 atom Chemical compound [23Na] KEAYESYHFKHZAL-IGMARMGPSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 235000013311 vegetables Nutrition 0.000 description 2
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- TVFDJXOCXUVLDH-AKLPVKDBSA-N cesium-136 Chemical compound [136Cs] TVFDJXOCXUVLDH-AKLPVKDBSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000001730 gamma-ray spectroscopy Methods 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- CYPPCCJJKNISFK-UHFFFAOYSA-J kaolinite Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[O-][Si](=O)O[Si]([O-])=O CYPPCCJJKNISFK-UHFFFAOYSA-J 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910052680 mordenite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- KEAYESYHFKHZAL-BJUDXGSMSA-N sodium-22 Chemical compound [22Na] KEAYESYHFKHZAL-BJUDXGSMSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002195 synergetic effect Effects 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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Description
(2)前記多孔質粒状ペーパースラッジ炭化焼成物の製造工程には、KIの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及びセシウム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多孔質粒状ペーパースラッジ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500〜1,300℃、望ましくは700〜1,200℃の還元炭化焼成炉で炭化焼成する。さらに望ましくは、800〜1,100℃で炭化焼成する。
(6)前記多孔質粒状ペーパースラッジ炭化焼成物は、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)前記多孔質粒状ペーパースラッジ炭化焼成物は、容積空隙率が70%以上、空隙容積が1,000mm3/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。
放射性物質汚染土壌(100g、OD)、1%塩化カリウム(土壌重量に対する%)の順でポリエチレン袋に入れる。同様に、放射性物質汚染土壌(100g、OD)、1%塩化セシウム(土壌重量に対する%)の順で別のポリエチレン袋に入れる。ポリエチレン袋の内容をそれぞれよく混合し、25oC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。
6%CaCl2−PSCの調整は、次の手順で実施した。CaCl2・2H2O(23.838g)を蒸留水(300ml)に溶解し、次いで、浅い容器の中のPSC(300g、OD)上に注ぎ、25OCで、24〜48時間乾燥を行い、その間容器を2〜3回振った。同様の方法にて、KCl−PSC、BaCl2−PSC、MgCl2−PSC、CsCl−PSCを作成した。放射性物質汚染土壌(85g、OD)、前記塩化金属化合物−PSC(15g、OD)の順でポリエチレン袋に入れ、均一に混合し、25oCで、10日間放置した。ブランクテストは、放射性物質汚染土壌(85g、OD)とPSC(15g、OD)をポリエチレン袋の中で均一に混合し、同じ条件で試験を行った。その後、放射性セシウム134及び137を測定した。結果を表4に示す。
1%MgSO4−PSCは次の方法で調整した。硫酸マグネシウム(MgSO4、3g)を蒸留水(300ml)に溶解し、次いで浅い容器の中のPSC(300g、OD)上に注ぎ、25OCで、24〜48時間乾燥を行い、その間容器を2〜3回振った。同様な方法により、硫酸カリウムでK2SO4−PSCを、FeSO4・7H2OでFeSO4−PSCを、ZnSO4・7H2OでZnSO4−PSCを、CuSO4・5H2OでCuSO4−PSCを、硫酸セシウムでCsSO4−PSCを、それぞれ作成した。放射性物質汚染土壌(85g、OD)、硫酸金属塩−PSC(15g、OD)の順でポリエチレン袋に入れ、均一に混合し、25oCで、10日間放置した。ブランクテストは、放射性物質汚染土壌(85g、OD)とPSC(15g、OD)とをポリエチレン袋の中で均一に混合し、同じ条件で試験を行った。その後、放射性セシウム134と137の測定を行った。結果を表5に示す。
1%フェロシアン化カリウム−PSCは次の方法で調整した。K4[Fe(CN)6]3H2O(3.385g)を蒸留水(360ml)に溶解し、次いで浅い容器の中のPSC(300g、OD)上に注ぎ、25OCで、24〜48時間乾燥を行い、その間容器を2〜3回振った。放射性物質汚染土壌(85g、OD)、フェロシアン化カリウム−PSC(15g、OD)の順でポリエチレン袋に入れ、均一に混合し、25oCで、10日間放置した。ブランクテストは、放射性物質汚染土壌(85g、OD)とPSC(15g、OD)とをポリエチレン袋の中で均一に混合し、同じ条件で試験を行った。その後、放射性セシウム134と137の測定を行った。結果を表6に示す。
Claims (3)
- イオン交換可能な金属の塩化物を、ペーパースラッジからなる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放射性物質汚染土壌とを混合し、前記放射性物質汚染土壌の放射性セシウム134及び137とのイオン交換を行うものであり、
前記多孔質粒状炭化焼成物に含浸させる塩化物が塩化カリウムであり、この塩化カリウムが、前記多孔質粒状炭化焼成物の重量の0.5%以上5%以下である、
ことを特徴とする放射性物質汚染土壌の除染方法。 - イオン交換可能な金属の硫酸塩を、ペーパースラッジからなる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放射性物質汚染土壌とを混合し、前記放射性物質汚染土壌の放射性セシウム134及び137とのイオン交換を行うものであり、
前記硫酸塩が、硫酸カリウム、硫酸マグネシウム、及び硫酸銅からなる群から選択される1または2以上の硫酸塩であり、前記硫酸カリウムが前記多孔質粒状炭化焼成物の重量の1%以上5%以下、前記硫酸マグネシウムが前記多孔質粒状炭化焼成物の重量の1%以上5%以下、及び前記硫酸銅が前記多孔質粒状炭化焼成物の重量の1%である、
ことを特徴とする放射性物質汚染土壌の除染方法。 - 塩化カリウムが、ペーパースラッジからなる多孔質粒状炭化焼成物の重量の0.5%以上5%以下であり、
硫酸カリウムが、前記多孔質粒状炭化焼成物の重量の1%以上5%以下であり、
硫酸マグネシウムが、前記多孔質粒状炭化焼成物の重量の1%以上5%以下であり、
硫酸銅が、前記多孔質粒状炭化焼成物の重量の1%であり、
フェロシアン化カリウムが、前記多孔質粒状炭化焼成物の重量の0.5%以上5%以下であり、
前記塩化カリウム、前記硫酸カリウム、前記硫酸マグネシウム、前記硫酸銅、及びフェロシアン化カリウムからなる群から選択される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放射性物質汚染土壌とを混合し、前記放射性物質汚染土壌の放射性セシウム134及び137とのイオン交換を行う、
ことを特徴とする放射性物質汚染土壌の除染方法。
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