Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Volume 66 , Issue 1
Showing 1-10 articles out of 10 articles from the selected issue
Special Issue : ”A View of Development of Seawater Integrated Utilization Technology”
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Original Paper
  • Hideaki SASAKI, Kentaro KURIKI, Akinobu OSHIMA, Akio ISHIDA, Shinichi ...
    2012 Volume 66 Issue 1 Pages 30-35
    Published: 2012
    Released: November 01, 2013
    The effect of the amount of proline transporter ProP expression on the mechanism of quick adaptation of Escherichia coli cells under high salinity was analyzed. The ProP gene derived from E. coli expression plasmid was introduced into E. coli cells, and a ProP high expression strain was developed. Under 1.2 M NaCl culture conditions, the growth of normal E. coli cell was inhibited, whereas ProP high expression cells showed remarkable growth. The uptake of proline by E. coli as a compatible solute accorded well with those of cell growth. These data suggested that the amount of proline transporter ProP expression played an important role in quick adaptation of E. coli cells under 1.2 M NaCl culture conditions.
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  • Masahiko NAGAI, Kanji MATSUMOTO, Kazuho NAKAMURA, Mitsuyoshi HIRAI, Ta ...
    2012 Volume 66 Issue 1 Pages 36-44
    Published: 2012
    Released: November 01, 2013
    When using a microfiltration/ultrafiltration membrane system for the pretreatment of seawater in a reverse osmosis (SWRO) desalination plant, back washing and air scrubbing are often used to prevent performance deterioration of membrane pretreatment systems.  Although it is common to manage the differential pressure of the membrane unit by monitoring equipment performance, this differential pressure is a whole unit of differential pressure, including the pipes and valves. So the differential pressure of the membrane (trans-membrane pressure, TMP) of itself, which was affected by fouling, is not necessarily measured. The calculation method for the estimation of TMP and the resistance coefficient using the measured differential pressure of the whole unit and the filtrate flow rate is proposed. Furthermore, the flow rate and TMP at filtration and back washing were examined theoretically for the vertical hollow fiber membrane module, and membrane resistance was calculated. The effects on the membrane performance recovery of chlorine injection and air scrubbing for back washing in pilot plant operation were examined by analyzing TMP and membrane resistance behavior. With these results, the effectiveness of monitoring membrane resistance was clarified in the operation of a membrane pretreatment system for SWRO plant.
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