Flocculation improves uptake of Sr and Cs from radioactive effluents |
| |
| Authors: | Tapan K Rout Dilip K Sengupta Laxmidhar Besra |
| |
| Institution: | 1. Tata Iron and Steel Company Ltd, Jamshedpur-831007, India;2. Mineral Processing Technology Division, Regional Research Laboratory (Council of Scientific and Industrial Research), Bhubaneswar-751013, India |
| |
| Abstract: | This paper presents the results of investigation on uptake of radioactive species 90Sr and 137Cs present in the liquid effluents from nuclear processing plants. Chemical precipitation process is adopted to remove radioactivity from the effluents with low and intermediate level of activity. In this process, radioactive 90Sr and 137Cs are co-precipitated along with copper ferrocyanide, ferric hydroxide and either calcium phosphate or barium sulphate. These precipitates being fine in size require flocculation for enhanced settling rate in clarifier/thickener. The flocculation by some selected high molecular weight polyacrylamide based polymers has improved the uptake of radioactive metal ions. The adsorption of these radioactive species has been found to increase in the presence of these flocculants thereby improving the decontamination factor (DF). While flocculating the precipitates, there may be some complex formation with Sr2+/Cs+, flocculant and the substrate. This has enhanced the uptake of the radioactive metal ions from the liquid component. The plant trials have indicated the improvement of DF value due to flocculation by cationic flocculant. |
| |
| Keywords: | Radioactive effluent Synthetic sludge 90Sr and 137Cs uptake flocculation |
| 本文献已被 ScienceDirect 等数据库收录！ |
