Removal of cesium from simulated liquid waste with countercurrent two-stage adsorption followed by microfiltration

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• 作者：Fei Han ; Guang-Hui Zhang ; Ping Gu ; ^{guping@tju.edu.cn}
• 关键词：Cesium removal ; Copper ferrocyanide ; Countercurrent two-stage adsorption ; Microfiltration
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 出版时间：30 July, 2012
• 年：2012
• 卷：225-226
• 期：Complete
• 页码：107-113
• 全文大小：614 K

文摘

Copper ferrocyanide (CuFC) was used as an adsorbent to remove cesium. Jar test results showed that the adsorption capacity of CuFC was better than that of potassium zinc hexacyanoferrate. Lab-scale tests were performed by an adsorption-microfiltration process, and the mean decontamination factor (DF) was 463 when the initial cesium concentration was 101.3 ¦Ìg/L, the dosage of CuFC was 40 mg/L and the adsorption time was 20 min. The cesium concentration in the effluent continuously decreased with the operation time, which indicated that the used adsorbent retained its adsorption capacity. To use this capacity, experiments on a countercurrent two-stage adsorption (CTA)-microfiltration (MF) process were carried out with CuFC adsorption combined with membrane separation. A calculation method for determining the cesium concentration in the effluent was given, and batch tests in a pressure cup were performed to verify the calculated method. The results showed that the experimental values fitted well with the calculated values in the CTA-MF process. The mean DF was 1123 when the dilution factor was 0.4, the initial cesium concentration was 98.75 ¦Ìg/L and the dosage of CuFC and adsorption time were the same as those used in the lab-scale test. The DF obtained by CTA-MF process was more than three times higher than the single-stage adsorption in the jar test.