All issues
Volume 42, Issue 1
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Noriko SHIMIZU, Noboru OGATA1988 Volume 42 Issue 1 Pages 3-6
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe effects of temperature and flow rate on solution velocity constant of sodium chloride were theoretically induced and experimentally measured for quantitative estimation in the change of solution velocity in various conditions of solution. Finally, an estimation formula on solution velocity constant in each condition was induced. In this work, the solution velocity constant was based on the assumption from Nernst's theory that the mass transfer coefficient was decided by liquid diffusion constant/thickness of boundary layer. The experimental values agreed with the theoretical ones in the case of boundary layer δ=0.03Re-0.5.View full abstractDownload PDF (2446K) -
Tatsuo HIRAI, Norihiko SAKATA, Michimasa YAMADA, Junichi TSUJITANI, Mo ...1988 Volume 42 Issue 1 Pages 7-14
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSBased on the concept of adsorber previously proposed by some of the present authors, a submarine adsorber system utilizing the energy of ocean current was proposed. In order to make the concept of adsorber practical, the system design was made by taking into account the support of equipment in the sea, the equipment structure, the packed bed of adsorbents, the mooring method and the replacement of adsorbents.
An estimation equation of adsorber cost was derived for the present type of adsorber. The optimum dimensions of adsorber were determined under the restrictions such as the size of dock in a shipbuilding factory and the stability in towing and mooring the equipment. The calculated results suggested that the adsorber cost decreased by around 30% under the optimum condition. And the transportation system of the adsorbent was investigated. In the case where a mother ship system was adopted, the transportation cost was 5,000 yen/ton-adsorbent.
It was made clear that the total recovery cost of uranium from the seawater could be reduced to 140,000yen/kg-U from 190,000yen/kg-U based on the above consideration. It was also considered necessary to further improve the adsorption capacity of adsorbent in order to realize a sharp reduction in the recovery cost of uranium.View full abstractDownload PDF (5242K) -
Tadashi SHIROTSUKA, Kaoru ONOE, Seiichi MOCHIZUKI1988 Volume 42 Issue 1 Pages 15-21
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA study was condtcted on the effect of the diameter of amidoxime-type fibrous adsorbents on their physical properties, and on the kinetics and mechanism of adsorption. The specific surface area was increased by thinning, thereby improving the adsorption rate. Experiments on the contacting properties of sheet-type fibrous adsorbents showed that mass transfer resistance between liquid and the fiber at sea flow rate could be ignored. A current-driven system which considerably reduces the operating costs can be used. The intrafiber diffusion coefficient for alkali-treated superfine fiber amidoxime fiber (SFF-AOF) was determined to be 5.0×10-14m2/s. This is four times greater than that of untreated SFF-AOF, owing to the increase in the number of hydrophilic groups.View full abstractDownload PDF (5243K) -
Studies on Environmental Analysis (Part 37)Futoshi SUGIMOTO, Yoshimichi MAEDA, Takatugu AZUMI1988 Volume 42 Issue 1 Pages 22-27
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA method of preconcentration with iron (III) was studied for graphite furnace atomic absorption spectrometry (GFAAS) of trace amount of chromium in sea and river waters. A ten milliliters of 10 w/v% ammonium carbonate buffer was added to 100 ml of sample water, the pH of which was adjusted to about 7.5, followed by adding 3 mg of iron (III). Only chromium (III) was quantitatively coprecipitated. The coprecipitate was collected onto a membrane filter paper. Chromium (VI) was then coprecipitated by adding (1+11) HCl of 20 ml and 3 mg of iron (II) to the membrane filtrate, and adjusting the pH to about 7.5. The coprecipitate was also collected onto another membrane filter paper. The precipitate containing chromium (III) was dissolved with 25 ml of (1+20) HCl, and the solution was used as the sample solution for GFAAS. The linear range of calibration curve was from 0.5 to 5μg/l, and the detection limit for chromium was 0.26μg/l, and the lower limit of determination was 0.85μg/l in the case of using 100 ml of sample water. This method was not influenced by sample water from 100 to 1,000 ml, and was satisfactorily applied to the separation analysis of trace of chromium in sea water and river water.View full abstractDownload PDF (5679K) -
Atsushi TOMITA1988 Volume 42 Issue 1 Pages 28-32
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESS -
Takesi FUJITA1988 Volume 42 Issue 1 Pages 33-40
Published: 1988
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (7073K)
- |<
- <
- 1
- >
- >|