| The Fukushima nuclear leak in Japan in 2011 has drawn the attention of society to study of radioactive contamination.As a major country of the development and application of nuclear energy,China attaches great importance to the study of radioactive contamination control.To deal with the potential radioactive cesium pollution in drinking water,in this paper,the design of the pilot scale reactor system was based on the process parameters which were obtained in the previous study and lab-scale experimental results.Then,the differences between the two kinds of adsorbent in particle size,particle size distribution and adsorption performance were compared.The results showed that the particle size of adsorbent prepared by the laboratory was evenly distributed,and the average particle size was about 30 nm.While,the adsorbent prepared by the pilot scale was seriously aggregated and the average size was about100 nm.For the latter,the particle size was larger,settlement rate was faster,but the adsorption performance decreased.According to the design,all water pumps,dosing pumps,stirrers,liquidometers and programmable control system were debugged.The results showed the system can run steadily and the flow calibration of the dosing pump was important for the tests.In the study,the original water target concentration was 100?g/L and the tests were conducted with adsorbent dose of 40 mg/L and 20mg/L,respectively.When the dose of adsorbent was 40 mg/L,the average decontamination factor(DF)was 132,and the membrane fouling rate was11.22~34.07 L/(m~2·h.m~2).When the dose of adsorbent was 20 mg/L,the average DF was 83,and the membrane fouling rate was 1.45~7.39 L/(m~2·h.m~2).The concentration factors in the two tests were both higher than 2000.In summary,because of the decrease of adsorbent performance and the influence of stirring intensity,the DF obtained by pilot scale tests was much lower than that obtained by lab-scale tests,the former was about 1/9 of the latter. |
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