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Cesium separation using electrically switched ion exchange

机译：使用电开关离子交换分离铯

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摘要

Electrically switched ion exchange (ESIX) is a separation technology being developed at Pacific Northwest National Laboratory as an alternative to conventional ion exchange for removing metal ions from wastewater. In ESIX, which combines ion exchange and electrochemistyr, ion uptake and elution can be controlled directly by modulating the potential of an ion exchange film that has been electrochemically deposited onto an electrode. This paper presents the results of experiments on high surface area electrodes and the development of a flow system for cesium ion separation. Bench-scale flow system studies showed no change in capacity or performance of the ESIX films at a flow rate up to 113 bed volumes/h (BV/h), the maximum flow rate tested, and breakthrough curves supported once-through waste processing. A comparison of results for a stacked five-electrode cell versus a single-electrode cell showed enhanced breackthrough performance. In the stacked configuration, breakthrough began at approximately 120 BV for a feed containing 0.2 ppm cesium at a flow rate of 13 BV/h. A case study for the KE Basin (a spent nuclear fuel storage basin) on the Hanford Site demonstrated that KE Basin wastewater could be processed continuously with minimal waste generation, reduced disposal costs, and lower capital expenditures.
机译：电交换离子交换（ESIX）是太平洋西北国家实验室开发的一种分离技术，是常规离子交换的一种替代方法，用于去除废水中的金属离子。在结合离子交换和电化学的ESIX中，可以通过调节已经电化学沉积到电极上的离子交换膜的电势来直接控制离子的吸收和洗脱。本文介绍了高表面积电极的实验结果以及铯离子分离流动系统的发展。实验室规模的流动系统研究表明，在最高113床体积/小时（BV / h）的流速，测试的最大流速和突破性曲线支持一次性废物处理的条件下，ESIX膜的容量或性能没有变化。堆叠式五电极电池与单电极电池的结果比较显示出增强的穿透性能。在堆叠配置中，对于含0.2 ppm铯，流速为13 BV / h的进料，突破速度约为120 BV。对汉福德基地的KE盆地（一个乏核燃料存储盆地）进行的案例研究表明，KE盆地的废水可以连续处理，产生的废物最少，降低了处置成本，并降低了资本支出。

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