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    • 1. 发明专利
    • METHOD FOR DISPOSING OF WASTE OF MOLTEN SALT
    • JPH112694A
    • 1999-01-06
    • JP15523597
    • 1997-06-12
    • HITACHI LTD
    • ITO SHUICHISAWA TOSHIOHOSHIKAWA TADAHIROSUZUOKI AKIRA
    • G21F9/06
    • PROBLEM TO BE SOLVED: To dispose of a high-level radioactive waste of a used molten salt in the form of a homogeneous solidified body by desorbing radioactive metal constituents adsorbing in saturation to an inorganic ion exchanger and converting the desorbed molten salt and the radioactive metal constituents to radioactive solidified bodies according to their respective radioactive levels. SOLUTION: Zeolite, for example, is used as an inorganic ion exchanger. By feeding a waste of a molten salt to a zeolite column 12 and then supplying hyperpure water, an Na2 SO4 solution or a BaSO4 one by one to the zeolite column 12, a molten salt is desorbed from the zeolite in the ascending order of the interaction with zeolite and each of them is separated and recovered. After eluting the constituents of the molten salt occluded by weak force, in other words, an FP element (an element of a radioactive fission product) adsorbed by an ion exchange effect is desorbed, separated and recovered. Therefore, a waste of a molten salt generated from dry reprocessing can be disposed of as a borosilicate vitrified body or a similar homogeneous solidified body, just as in the case of a solidified body of a high-level radioactive waste made by the PUREX method.
    • 4. 发明专利
    • METHOD AND DEVICE FOR WASTE LIQUID TREATMENT
    • JPH07303821A
    • 1995-11-21
    • JP9975794
    • 1994-05-13
    • HITACHI LTD
    • SAWA TOSHIOSUGIMOTO YOSHIKAZUSETO CHIAKI
    • B01D61/36B01D61/44C01B21/42C01C1/10C02F1/469C02F9/00C25B7/00
    • PURPOSE:To provide a method for treating a waste liquid by which an adequate amount of nitrate ion and ammonium ion is removed from the waste liquid and nitric acid and ammonium of high purity and high concentration are recovered at high recovery rate by desalting the waste liquid efficiently without lowering the concentration of electrolytes in the waste liquid as well as a waste liquid treatment device. CONSTITUTION:A waste liquid flows into an evaporation part after being heated by a heating part, and is concentrated by the process that moisture moves as a vapor through a hydrophobic membrane and is condensed by cooling water. Further, the concentrated waste liquid is sent to an electrolytic dialysis part 1 after being cooled by a refrigeration part, and is supplied to the desalinization chamber of each dialysis chamber 1A to 1C. If a voltage is applied to an anode 390 and a cathode 31, NO3-and NH4+ of the waste liquid migrate to an anode chamber 10 or a cathod chamber 12 through an anion exchange membrane 11 and a cation exchange membrane 13. Nitric acid is introduced from a nitric acid recovery system 18 into the anode chamber 10, and is returned to a nitric acid liquid tank 34 for circulation after absorbing NO3-. Aqueous ammonia is introduced from ammonia recovery system 19 into the cathode chamber 12, and is returned to an aqueous ammonia tank 20 for circulation after absorbing NH4+.
    • 5. 发明专利
    • MEMBRANE DISTILLATION DEVICE
    • JPH07768A
    • 1995-01-06
    • JP14327693
    • 1993-06-15
    • HITACHI LTD
    • YOSHIOKA CHIKAKOKUROKAWA HIDEAKISAWA TOSHIO
    • B01D61/36C02F1/32C02F9/00
    • PURPOSE:To keep the surface tension of raw water and to prevent the infiltration of org. matter into generated water by setting a UV irradiation device as the pretreatment for membrane distillation and decomposing the org. matter in the raw water into low-mol.wt. material. CONSTITUTION:This membrane distillation device is formed by a membrane distillation part 2 consisting of a raw water circulating line 33 for supplying raw water 32 to a membrane distillation cell 21 and returning the undistilled water 34 to the raw water side and a generated water circulating line 35 for drawing off the high-purity water permeated through the membrane 22 of the cell 21 and a reaction part 1 for oxidizing and decomposing the org. impurities contained in the raw water 31. A UV irradiation device 11 is used in the reaction part 1. The raw water 32 is permeated through the hydrophobic porous membrane 22, distilled in the distillation part 2 and treated. Consequently, the org. matter in the raw water is irradiated with UV and decomposed into low- mol.wt. org. matter, and the surface tension of the liq. is not lowered. Accordingly, the membrane is not made hydrophilic in the distillation part, the org. matter is not infiltrated into the generated water and the pretreatment for membrane distillation is effectively performed.
    • 7. 发明专利
    • METHOD AND DEVICE FOR CONVERTING CARBON DIOXIDE
    • JPH05193920A
    • 1993-08-03
    • JP1011992
    • 1992-01-23
    • HITACHI LTD
    • UETAKE NAOTOSAWA TOSHIO
    • B01J23/755B01J23/78C01B31/02C07C1/00C07C9/04
    • PURPOSE:To efficiently convert carbon dioxide into methane at a relatively low temp. by passing carbon dioxide and hydrogen through a ferrite to deposit carbon on the ferrite surface and heating the ferrite in hydrogen. CONSTITUTION:A gas contg. carbon dioxide is supplied to a carbon dioxide separator 2 and passed through a separation. membrane, and the permeated carbon dioxide is sent to a moisture remover 3 to remove the moisture in the carbon dioxide. The carbon dioxide is then introduced through a switching valve 4 into a first reaction furnace 5 contg. a ferrite lump 6 kept at 300-400 deg.C, and hydrogen is supplied to the first reaction furnace 5 from a pipe 17. The carbon dioxide is reduced on the surface of the ferrite lump 6, and carbon is deposited. The gas leaving the first reaction furnace 5 is introduced into a hydrogen separator 8, and the hydrogen permeated through an palladium membrane is recycled. A ferrite lump 11 coated with carbon is introduced into a second reaction furnace 10 kept at >=about 600 deg.C. Hydrogen is supplied to the second reaction furnace 10 from the pipe 17, and the carbon deposited on the ferrite lump 11 is allowed to react with the hydrogen and converted into methane.
    • 8. 发明专利
    • WATER TREATING EQUIPMENT
    • JPH04290597A
    • 1992-10-15
    • JP5459091
    • 1991-03-19
    • HITACHI LTD
    • KUROKAWA HIDEAKISAWA TOSHIOMITANI KENJI
    • B01D1/18B01D46/10B01D46/18B01D46/24B01D53/22B01D53/26C02F1/12C02F9/00
    • PURPOSE:To provide the recycled water treating equipment capable of completely separating the impurities from the concd. water generated from a water treating device and capable of being operated even in an agravity state. CONSTITUTION:The concd. water 106 from a water treating device 101 (mainly for membrane distillation) is atomized by a nozzle 108 in a crystallization part 117, brought into contact with the gas 107 heated by a heater 104 and vaporized, hence the impurities in concd. water are suspended in the gas as solid particles, and the particles are removed by a filter 111. The high-humidity gas 112 freed of the particles is separated by a dehumidifier 103 into water 114 and a gas 113, and the water 114 is returned to the water treating device 101 and the gas 113 to the heater 104. The moisture in the high-humidity gas 112 is absorbed in a liq. absorbent through a hydrophobic porous membrane in the dehumidifier 103, the moisture in the absorbent is recovered as water through another hydrophobic porous membrane, or the moisture in the gas 112 is cooled and condensed and then the water droplets and the gas are separated by the hydrophobic porous membrane.
    • 10. 发明专利
    • METHOD AND DEVICE FOR TREATING SOLUTION CONTAINING SALTS
    • JPH04187218A
    • 1992-07-03
    • JP31391990
    • 1990-11-21
    • HITACHI LTD
    • YAMAGUCHI TETSUOFUNABASHI KIYOMISAWA TOSHIOKIKUCHI JUN
    • B01D61/36
    • PURPOSE:To prevent a soln. contg. salts from being mixed in cooling water and to keep the purity of the recovered water high by keeping the deaerated cooling water to be introduced into the cooling chamber of a membrane evaporative concentrator at a pressure higher than that of the soln. contg. salts to be introduced into an evaporation chamber opposed to the cooling chamber with a hydrophobic porous membrane in between. CONSTITUTION:A soln. contg. salts in a storage tank 4 is heated to a specified temp., supplied to the evaporation chamber 13 of a membrane evaporative concentrator 1 through a circulating line 2 and circulated through a circulating line 2A. Meanwhile, the pure water in a storage tank 7 is cooled to a specified temp., supplied to the cooling chamber 14 of the concentrator 1 through a circulating line 3 and circulated through a circulating line 3A and a deaerator 10. The high-temp. soln. in the evaporation chamber 13 and the low-temp. cooling water in the cooling chamber 14 are separated by a membrane 12. Since a hydrophobic porous membrane is used as the membrane 12, only the steam generated from the soln. is passed through the pores of the membrane and condensed on the cooling water side. An excess of the condensed water is recovered, for example, from the tank 7 of the lines 3 and 3A.