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Volume 40 (1986 - 198･･･
- Issue 6 Pages 323-
- Issue 5 Pages 265-
- Issue 4 Pages 211-
- Issue 3 Pages 135-
- Issue 2 Pages 78-
- Issue 1 Pages 3-
Volume 40, Issue 6
Displaying 1-5 of 5 articles from this issue
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Shunichiro UCHIDA1987 Volume 40 Issue 6 Pages 323-341
Published: 1987
Released on J-STAGE: February 19, 2013
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Yasuo MIYAKE, Katsuko SARUHASHI, Takeshi SAGI, Teruko KANAZAWA1987 Volume 40 Issue 6 Pages 342-349
Published: 1987
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSTotal contents of biophile elements such as C, N, P etc. in the ocean should be constant owing to their longer residence time. This idea was proved to be true by using the dry combustionmethod of analysis of organic matters. In addition, it was found that the concentration of their inorganic and organic forms was expressed respectively as a sum of a constant term (the primary concentration) and a variable term (plus or minus).
In the upper layer from the surface to the depth of 1,000m, the variation of concentration of each element was determined mainly by organic production, while in the deeper layer, by oxidative decomposition.
Results of study in the Pacific Ocean showed that the total concentrations of C, Nand P in sea water were respectively 2,410, 48.2 and 3.48μg at/kg, and the respective primary concentrations were 2, 150, 20.2 and 1.58μg at/kg for inorganic forms, and 260, 28 and 1.9μg at/kgfor organic forms. The primary concentration was defined as the ideal concentration of a biophile lementof each form when there were no organic production and oxidative decomposition in the ocean.
The coefficients related to AOU were 0.4, 0.043 and 0.0029 respectively for C, N and P. On the basis of above values, the ratios of concentration among these biophile elements in inorganic forms at different location and depth were calculated, the results of which agreed quite well with observations.View full abstractDownload PDF (6826K) -
Studies on Pretreatment of Sea Water for the Electrodializer with an Ion-Exchange MembraneKen-ichi KAGIWADA, Satoshi NAGATSUKA, Kiyomi SOGA, Shizuo SUGITA1987 Volume 40 Issue 6 Pages 350-355
Published: 1987
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSFor the purpose of the pretreatment of sea water for electrodializer with an ion-exchange membrane for a long time, authors studied on the secondary sea water filtration by the three companies' membranes of superfiltration and ultrafiltration.
The results were as follows:
1) The permeate flux of K, P and S companies' membranes was 280,100 and 200l/m2·h·atm, respectively.
2) On the permeate quality, the decreasing rate of number of suspended matters to the first sand filtrate was over 94%, and the decreasing rate of iron content was in the range of 46-64% except the measured value of P company's membrane at 0.5kg/cm2.
3) In regard to the resistance of permeation, K company's membrane is the least at non adherence on the membrane, but in case of the suspended matters adhered on the membrane, the resistance increases, and the permeate flux has a tendency to decrease as compared with other two membranes.
4) The effective washing method of membrane is a dipping method in sodium hypochlorite solution or sodium hydrooxide solution for two hours, and then the permeate flux recovers about double over the previous level.
5) The quality of the treated sea water by three companies' membranes are fitting for the electrodializer with ion-exchange membranes. But it is considered that the practical use is difficult because of its small scale of apparatus and its high washing cost at the present time.View full abstractDownload PDF (3386K) -
Studies on Pretreatment of Sea Water for the Electrodializer with an Ion-Exchange Membrane (Part 2)Satoshi NAGATSUKA, Ken-ichi KAGIWADA, Kiyomi SOGA, Shizuo SUGITA1987 Volume 40 Issue 6 Pages 356-362
Published: 1987
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSBy using a 2dm2 electrodializer, an experiment was carried out for a fifty days without electriccurrent to investigate the effect of qualities of four treated sea waters on the adhered matter of membrane.
The followings were made clear by the investigation on the sea water quality, the pressure rise in the electrodializer, the adhesion rate of suspended matter and the composition of adhered matter:
1) The qualities of the first and the second sand filtrate were changed in the turbidity of the raw sea water. But the quantity of filtrate by superfiltration membrane was stable, and a longrun operation seemed to be possible.
2) The quality difference between the treated sea water by ozone the first sand filtered sea water was not recognized, but the adhesion rate of the former was considerably smaller than the latter.
3) The term of continuous operation was estimated by an experimental equation concerning the MFT (membrane filtration time).
4) The adhesion rate of suspended matters of the membrane and the spacer was decreased in the order of the first sand filtrate, the second sand filtrate, the ozone treated sea water and the super filtration membrane filtrate, and these ratios were 100:50:30:18.
5) The composition of the adhered matters of the membrane and the spacers was principally organic matters in the super filtered sea water, and all filtrates adhered matters were similar to those of salt-making factories.View full abstractDownload PDF (4944K) -
Shuichi KIMURA1987 Volume 40 Issue 6 Pages 363-375
Published: 1987
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (9391K)
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