An attempt for the stabilization of supported liquid membrane

As a part of the investigation on the treatment of low-level radioactive wastewater using supported liquid membranes, a method for stabilizing a supported liquid membrane (SLM) is proposed. Aqueous Ce(III) solutions containing sodium nitrate and nitric acid were used as the simulated low level radio...

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Bibliographic Details
Published in:Separation and purification technology 2000-11, Vol.21 (1), p.137-144
Main Authors: Teramoto, Masaaki, Sakaida, Yasusi, Fu, Sheng Sheng, Ohnishi, Noriaki, Matsuyama, Hideto, Maki, Taisuke, Fukui, Toshiki, Arai, Kazihiro
Format: Article
Language:English
Subjects:
Applied sciences
Cerium
CMPO
Exact sciences and technology
Industrial wastewaters
Membrane separation
Pollution
Radioactive wastes
Radioactive wastewater
Stabilization
Supported liquid membrane
Wastes
Wastewater treatment
Wastewaters
Water treatment and pollution
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Summary:As a part of the investigation on the treatment of low-level radioactive wastewater using supported liquid membranes, a method for stabilizing a supported liquid membrane (SLM) is proposed. Aqueous Ce(III) solutions containing sodium nitrate and nitric acid were used as the simulated low level radioactive wastewater. The SLM consisted of octyl(phenyl)- N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO) as a carrier of Ce(III), tributyl phosphate (TBP) as a modifier and dodecane as a solvent. The strip solutions were aqueous solutions of chelating agents such as trisodium citrate and disodium hydrogen citrate. A small plate-and-frame type SLM module was used and circulation mode for both the feed and the strip solutions was adopted. The SLM was unstable and water permeation through the SLM occurred, suggesting replacement of the organic membrane solution in the pores of a support membrane by the aqueous feed solution. However, the SLM was stabilized by adding an organic membrane solution to the reservoir of the strip solution and by circulating the membrane solution through the strip side of the SLM module so that the SLM could frequently contact the membrane solution dispersed as droplets in the strip solution. By this method, the SLM was not degraded by repeated replacements of both the feed and the strip solutions. The effect of chelating agent in the strip solution on the permeation rate of Ce(III) was also investigated.
ISSN:1383-5866
1873-3794
DOI:10.1016/S1383-5866(00)00197-0