Commissariat a L'energie Atomique

Compagnie Generale Des Matieres Nucleaires

Henri Barnier

Marc Lemaire

Jacques Foos

Alain Guy

Claude Gudin

Rodolph Chomel

Catherine Thepenier

Colette Bardot

Patrick F Ferreira Dos Santos

Eric Gaubert

Jean-Jacques Radecky

Alain Maurel

The invention relates to a process for separating sodium from aqueous effluents resulting from the reprocessing of spent nuclear fuel elements. According to the invention, the effluent (3) is introduced into a tangential filtration module (11), whose membranes are made from polyaramide, sulphonated polysulphone or perfluorinated ionomer, so as to collect a permeate P containing sodium, depleted in radioactive elements and a retentate R enriched in radioactive elements.

Process for separating sodium from aqueous effluents resulting from the

Process for the production and extraction of polysaccharides from a porphyridium cruentum culture and apparatus for performing the process. This production and extraction process comprises a stage of concentrating the polysaccharides consisting of leaving the culture medium (1) in a photoreactor (22) exposed to sunlight under stagnant conditions and at ambient temperature, leading to the formation of a polysaccharide-rich cream (23) and recovering said cream by skimming, a stage (24) of heating the concentrate obtained at a temperature between 60.degree. and 100.degree. C., a stage of separating the solid and liquid phases formed (26), a stage (30) of precipitating the polysaccharides contained in the liquid phase and a stage (16) of drying the precipitate obtained.

Process for the production and extraction of polysaccharides from a

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Aix en Provence, France

Henri Barnier