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 37, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • Limiting Current Density of the Electrodialytic Equipment with Ion Exchange Membranes
    Hirofumi MIYOSHI, Takeshi KATAOKA
    1983 Volume 37 Issue 2 Pages 70-81
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.70
    JOURNAL FREE ACCESS
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  • The Nature of Free and Bound Water in Water and Solute Permeation of Cellulose Acetate Membranes in Reverse Osmosis
    Yoshihiro OGAWA, Sho SUZUKI
    1983 Volume 37 Issue 2 Pages 82-89
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.82
    JOURNAL FREE ACCESS
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    Cellulose acetate membranes were prepared from several Manjikian type casting solutions by changing the ratio of weight percent of formamide (F) to cellulose acetate (CA), that is, F/CA-value from 0.74 to 2.94. For these membranes, their transport coefficients (Lp, σ, and P) in Spiegler-Kedem equation and coupling coefficient Lpπ were obtained by reverse osmosis experiment. The free and bound water content in these membranes were investigated by means of differential scanning calorimetry.
    An attempt was made to obtain the correlation between both the free and bound water content and the phenomenological coefficients (Lp and Lpπ). The Lp and (-Lpπ) can be represented in terms of the external velocity of water (υw/ΔP) and the velocity of solute relative to that of water (υw-υs)/ΔP, per unit pressure, respectively, as reported by Katchalsky and Curran.
    It was stated that the coupling coefficient (-Lpπ)=(υw-υs)/ΔP was concerned with the bound water content, and the hydraulic permeability Lp=(υw/ΔP), also with the bound water content so far as 2 of F/CA-value, but above 2, the Lp, with the free water content.
    In the range (F/CA-value<2) that the role of bound water take spart in water permeation, the increase of the bound water content gave little effect on the solute permeation, but in the range (F/CA-value>2) that the role of free water does part in water permeation, the amount of solute permeation through the membranes increased steeply.
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  • Equilibria of NaCl-KCl-MgCl2-CaCl2-H2O System at 110°C
    Kyunosuke MAJIMA, Shumpei OKA
    1983 Volume 37 Issue 2 Pages 90-96
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.90
    JOURNAL FREE ACCESS
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    This paper reports the isotherm of the quinary system of NaCl-KCl-MgCl2-CaCl2-H20 at 110°C. In order to obtain the isotherm of the quinary system at 110°C, the authors made the experiment to get the isotherms of the ternary and quaternary systems comprising some of these salts which had not been made clear yet. Then the isotherm of the quinary system has been determined by putting the published literature and experimental results together.
    The isotherm of NaCl-KCl-MgCl2-CaCl2-H2O system at 110°C resembles that of KCl-MgCl2-CaCl2-H2O system at the same temperature. As the temperature rises, the contents of sodium chloride, potassium chloride and magnesium chloride increase, but that of calcium chloride decreases. Similarly, as the temperature rises, the production areas of the double salt of CaCl2·KCl, tachhydrite and carnallite are enlarged, but that of MgCl2·6H2O is reduced.
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  • Consideration on the Solar Desalination
    Yoshihiro NAKASHIMA, Ichiro FUJIWARA, Totaro GOTO
    1983 Volume 37 Issue 2 Pages 97-100
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.97
    JOURNAL FREE ACCESS
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    Feasibility of indirect solar seawater desalination process was studied numerically. It was hypothesized that the collector area was 2,500m2, rainfall was collected, collect efficiency of rain was 80% and water consumption was 10m3/day, and then water ballance was calculated.
    Potable water production by solar desalination is high in summer, but in winter it becomes 20% or less of summer.
    Rainfall is high in June and September, and greatly varied by seasonally and daily. It was concluded that very large storage was necessary for constant water supply.
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  • Development of Coastal Forest
    Jiro SUGI
    1983 Volume 37 Issue 2 Pages 101-108
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.101
    JOURNAL FREE ACCESS
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  • Fuel Conversion from Oil
    Seiichi OME
    1983 Volume 37 Issue 2 Pages 109-123
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.109
    JOURNAL FREE ACCESS
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  • Countermeasures against Corrosion and Biofouling on the Structure and Facilities Subject to Marine Environment
    Shunya ISO
    1983 Volume 37 Issue 2 Pages 124-134
    Published: 1983
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.37.124
    JOURNAL FREE ACCESS
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