Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 41, Issue 1
Displaying 1-3 of 3 articles from this issue
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  • Present State of Japanese Water Usage and Reusable Water Utilization (II)
    Shunichiro UCHIDA
    1987 Volume 41 Issue 1 Pages 3-37
    Published: 1987
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.41.3
    JOURNAL FREE ACCESS
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  • The Influence of Adsorbent Properties on Uranium Recovery Cost
    Susumu NAKAMURA, Yoshiro ITO, Masayoshi KANNO
    1987 Volume 41 Issue 1 Pages 38-46
    Published: 1987
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.41.38
    JOURNAL FREE ACCESS
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    The authors made a study as to how the variations of adsorbent properties would affect the unit production cost of uranium when it was extracted from sea water by the pumping and fixed-bed system. The study was conducted on the following assumption: hydrous titanium oxide was used as adsorbent, and the size of a plant was of the production capacity of 1,000t-U/y. The linear flow rate of sea water, the thickness of the bed, and adsorption time were changed according to the variations of adsorbent properties, and the optimum conditions of plant operation were set up. Taking into consideration of the depression of uranium concentration in sea water along with the direction of water flow in the bed, the amount of uranium adsorbed was calculated by using diffusion equations.
    The analyses of the system showed that the linear flow rate of sea water was not independent of the bed thickness, and the best combination yielded the minimum uranium cost. The effect of the equilibrated adsorption capacity of adsorbent upon the reduction of the unit production cost was small, but that of the liquid-film mass transfer coefficient kf was pretty large. The optimum adsorption time per cycle was about 25 days. As a result of cost estimations, the unit costs ranged from $289.2/1b to $190.2/1b U3O8 (1976 dollars) were obtained for the plant of the production rate of 1,000 t-U/y.
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  • New Technic of Electrodialyzer for Salt Production by Ion Exchange Membranes
    Yasutoshi KOBUCHI, Koichi DOI, Fumio HANADA, Hideo SHINOZUKA
    1987 Volume 41 Issue 1 Pages 47-50
    Published: 1987
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.41.47
    JOURNAL FREE ACCESS
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    An energy-saving demonstration plant which was equipped with the latest model, TSX-200, was built at Sanuki Salt Manufacturing Co. of Shikoku Island in August, 1983.
    For its operation started in July, 1985, there were employed CIMS membranes which were newly developed, having high permselectivity to monovalent cation, and new type ACS membranes with low electric resistance. Also, the electrodialyzer was modified. Thus, the following excellent results were obtained: the power consumption of 150kWh/t, NaCl content of 200g/l, current efficiency of 94%, and NaCl purity of 94%. The CIMS membrane does not require such selectivity treatment on the spot as required by the existing membranes.
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