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Volume 23 (2012)
- Issue 3 Pages 59-
- Issue 2 Pages 29-
- Issue 1 Pages 1-
Volume 23, Issue 1
Displaying 1-3 of 3 articles from this issue
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Review (Part of ion exchange for the treatment of nuclear high-level contaminated water)
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Kenji TAKESHITA, Takeshi OGATAArticle type: Review
2012 Volume 23 Issue 1 Pages 1-5
Published: 2012
Released on J-STAGE: February 02, 2012
JOURNAL FREE ACCESSBy the Fukushima nuclear disaster, large amounts of water and sea water polluted mainly with radioactive Cs were generated and the environment around the nuclear site was contaminated by the fallout from the nuclear site. The coagulation settling process using ferric ferrocyanide and an inorganic coagulant and the adsorption process using ferric ferrocyanide granulated by silica binder were applied to the treatment of polluted water. In the coagulation settling process, Cs was removed completely from polluted water and sea water (DF∼104). In the adsorption process, the recovery of trace Cs (10 ppb) in sea water, which was not suitable for the use of zeolite, was attained successfully. Finally, the recovery of Cs from sewage sludge was tested by a combined process with the hydrothermal process using subcritical water and the coagulation settling process using ferric ferrocyanide. 96% of radioactive Cs was recovered successfully from sewage sludge with the radioactivity of 10,000 Bq/kg.
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Review (Part of ion exchange for the treatment of nuclear high-level contaminated water (2))
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Hitoshi MIMURA, Isao YAMAGISHIArticle type: Review
2012 Volume 23 Issue 1 Pages 6-20
Published: 2012
Released on J-STAGE: February 02, 2012
JOURNAL FREE ACCESSLarge amounts of high-activity-level water accumulated in the reactor, turbine building and the trench in the facility were generated from the nuclear accident of Fukushima NPP1 caused by the Great East Japan Earthquake, which resulted in the operation obstacles and environmental contamination. As of October, 2011, the circulating injection cooling system is effectively operated and the cold shutdown is completed, while the amounts of high-activity-level water are estimated to be over 200,000 m3 in future. However, at present, the treatment and disposal methods for the solid wastes (zeolites, insoluble ferrocyanides and crystalline silicotitanate) are not yet decided. In particular, there is no experience in the treatment and disposal of high decontamination solid materials such as insoluble ferrocyanides and crystalline silicotitanate. Hence the development of effective treatment and disposal methods are very urgent and important subjects.
This special issue deals with the characterization and adsorption properties of selective adsorbents for high decontamination of cesium and the subjects for the treatment and disposal of solid wastes.
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Review (Annual Topics—Ionic Liquids)
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Takashi KAKIUCHIArticle type: Review
2012 Volume 23 Issue 1 Pages 21-27
Published: 2012
Released on J-STAGE: February 02, 2012
JOURNAL FREE ACCESSRecently, extraction of ions by use of ionic liquid-water two-phase systems has been intensively studied. However, the very fact that ionic liquids are salts that consist of cations and anions has been overlooked, except in interpreting the mechanism of the extraction, either in terms of ion-exchange or ion-pair extraction. In such systems, an electrochemical viewpoint is useful to see the fact that the partitioning of the ionic liquid between the ionic liquid-water two-phase system mainly determines the phase-boundary potential between the two phases, and the distribution and extraction of ions, accordingly.
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