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Gubarevich, A.*; Kubo, Ryotaro*; Arisaka, Makoto; Osugi, Takeshi; Yoshida, Katsumi*; Takeshita, Kenji*
Journal of Nuclear Science and Technology, 10 Pages, 2025/00
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)To immobilize and solidify carbonate-based Advanced Liquid Processing System (ALPS) sediment wastes, this study introduces a chemical transformation process that converts these wastes into calcium and magnesium phosphate phases, followed by densification using a novel cold sintering press (CSP) technique. Simulated calcium-magnesium carbonate slurries were treated with phosphoric acid to synthesize calcium and magnesium phosphates, which were then sintered at 300-500
C using CSP. The effects of the calcium-to-magnesium ratio, strontium incorporation, and sodium chloride addition on phase composition and CSP densification were investigated. Dense bulk samples were successfully fabricated and characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and the Archimedes method. The results showed that the chemical transformation process led to the formation of whitlockite and newberyite, with the calcium-to-magnesium ratio determining the relative proportions of these phases. Strontium was effectively incorporated into the whitlockite crystal structure, while newberyite enhanced densification through a dehydration-driven process. Sodium chloride had no effect on chemical transformation and was not found in the final solid product. These results show that direct conversion of calcium-magnesium carbonate slurries to whitlockite-based phosphate ceramics, followed by CSP, enables stable solidification, making this method promising for ALPS sediment waste management.
Maamoun, I.; Rushdi, M.*; Falyouna, O.*; Eljamal, R.*; Eljamal, O.*
Separation and Purification Technology, 308, p.122863_1 - 122863_16, 2023/03
Times Cited Count：13 Percentile：48.79(Engineering, Chemical)
removal from aqueous solutions; Cost-effectiveness & parametric effectsMaamoun, I.; Eljamal, R.*; Eljamal, O.*
Chemosphere, 312, Part 1, p.137176_1 - 137176_11, 2023/01
Times Cited Count：32 Percentile：85.84(Environmental Sciences)
and nano zero-valent ironIslam, M. S.*; Maamoun, I.; Falyouna, O.*; Eljamal, O.*; Saha, B. B.*
Journal of Molecular Liquids, 370, p.121005_1 - 121005_11, 2023/01
Times Cited Count：60 Percentile：98.70(Chemistry, Physical)Idham, M. F.*; Falyouna, O.*; Eljamal, R.*; Maamoun, I.; Eljamal, O.*
Journal of Water Process Engineering (Internet), 50, p.103289_1 - 103289_16, 2022/12
Times Cited Count：38 Percentile：92.71(Engineering, Environmental)Kato, Chiaki; Yamagishi, Isao; Sato, Tomonori; Yamamoto, Masahiro*
Zairyo To Kankyo, 70(12), p.441 - 447, 2021/12
Zeolite particles have been used in a Cs adsorption vessel for purification of contaminated water in Fukushima Daiichi Nuclear Power Station (1F). The used Cs adsorption vessels were kept in storage space on 1F site. The risk of localized corrosion of stainless steel used in the vessel was worried. To evaluate the risk of localized corrosion, using specially designed electrochemical testing apparatus was used under gamma-ray irradiation test. And, real size mock-up test conducted. The results showed the potential change caused by creation of H
O by water radiolysis decreased by zeolite particles and the enrichment of chloride ion concentration in the vessel do not propagate during dry up procedure of Cs adsorption vessel. These data indicate the risk of localized corrosion of Cs adsorption vessel may stay at considerably low level.
Yamagishi, Isao; Mimura, Hitoshi*; Idemitsu, Kazuya*
Insights Concerning the Fukushima Daiichi Nuclear Accident, Vol.1; Fears and Concerns Just After the Accident, and Anxiety about Radiation, p.213 - 223, 2021/04
The completion of step 2, in regard to efforts to resolve the Fukushima Daiichi Nuclear Power Plant accident, was declared in December 2011. Temporarily installed water treatment system is being operated for circulating water cooling, which is supporting the cold shutdown state of the nuclear reactors. However, the installation of permanent water treatment system, and efforts to deal with the storage, processing, and disposal of secondary wastes generated by the contaminated water treatment are also required. In this paper, we outline the current status of contaminated water treatment, and explain the adsorbent performance as well as technical issues regarding future processing and disposal.
Shibata, Atsuhiro; Koma, Yoshikazu; Oi, Takao
Journal of Nuclear Science and Technology, 53(12), p.1933 - 1942, 2016/12
Times Cited Count：20 Percentile：82.98(Nuclear Science & Technology)Awual, M. R.; Eldesoky, G. E.*; Yaita, Tsuyoshi; Naushad, M.*; Shiwaku, Hideaki; Alothman, Z. A.*; Suzuki, Shinichi
Chemical Engineering Journal, 279, p.639 - 647, 2015/11
Times Cited Count：261 Percentile：99.06(Engineering, Environmental)
Cs in radioactive wastes generated from contaminated water treatment system in Fukushima Daiichi Nuclear Power StationKato, Jun; Meguro, Yoshihiro
E-Journal of Advanced Maintenance (Internet), 7(2), p.138 - 144, 2015/08
Concentration of Cs in radioactive wastes such as used cesium adsorption vessels and sludge generated from the cesium adsorption device, the 2nd cesium adsorption device, and the decontamination device, which have operated or been suspended as a part of the contaminated water treatment system in Fukushima Daiichi Nuclear Power Stations, was calculated by using analysis data of the contaminated water. The total decontamination amount of Cs from Jun 6, 2011 to Aug 12, 2014 was estimated.
Nakanishi, Tomoko*; Furukawa, Jun*; Matsubayashi, Masahito
Nuclear Instruments and Methods in Physics Research A, 424(1), p.136 - 141, 1999/00
Times Cited Count：16 Percentile：73.07(Instruments & Instrumentation)no abstracts in English
;
Radiation Physics and Chemistry, 24(1), p.99 - 115, 1984/00
no abstracts in English
PelletJAERI-M 7158, 23 Pages, 1977/07
no abstracts in English
Kato, Jun; Taniguchi, Takumi; Osugi, Takeshi; Nakazawa, Osamu; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
Contaminated water treatment secondary wastes have diversity and have property without processing achievement so far. Tasks for applicability evaluation of these wastes were extracted concerning solidification technologies with applied achievement for radioactive waste processing by FY2017. This report introduces research and development for solving the extracted tasks.
