METHOD FOR THE DECONTAMINATION OF A RADIOACTIVE LIQUID EFFLUENT WITH ONE OR MORE RADIOACTIVE CHEMICAL ELEMENTS BY SOLID-LIQUID EXTRACTION USING A RECYCLING LOOP

摘要

The invention relates to a continuous method for the decontamination of a radioactive liquid effluent including one or more radioactive chemical elements to be removed that comprises the following steps: the step of contacting, in a first reactor, said radioactive liquid effluent with solid particles capable of trapping and retaining said radioactive chemical element(s) to be removed, thus providing a solid particle suspension containing the radioactive chemical element(s) to be removed; in a second reactor, the step of letting the suspension settle in order to obtain a solid phase including solid particles containing the radioactive chemical element(s) to be removed, and a liquid phase that with few or no radioactive chemical element(s) to be removed; the step of separating said solid phase and said liquid phase; characterised in that a portion of the solid phase obtained after the settling step is re-injected into the first reactor in order to implement a contacting step as defined above. The invention can be used for processing radioactive liquid effluents from nuclear power plants.