努力减少盐水（即氯化物）的使用和排放，以软化钡 伊利诺伊州水晶湖市评估了强酸钙的使用情况 用于去除钡的阳离子交换。进行了台架试验，以 评估使用氯化钙代替氯化钠再生强碱的效果 酸性阳离子树脂。钙型树脂用于选择性地去除钡 不影响水的总硬度。选择性地去除钡可以提供 再生之间的运行周期更长，因此氯化物使用量显著减少 然后出院。使用直径为1英寸的玻璃40进行台架试验- 英寸长，床深20英寸。下行服务模式是在一个较低的温度下运行的 每小时11床体积（BV）的流速。离子交换柱一直运行到 钡突破达到1.0 mg/L。离子交换系统在1.0 mg/L下运行 不同的循环使用不同的氯化钙再生浓度和空 床上接触时间（EBCT）。使用盐酸（HCl）来恢复 本研究还对树脂进行了评估。结果表明，钙离子的使用 exchange可以成功地去除钡，同时显著减少氯化物的使用和腐蚀 排出同样的技术也可用于从电池中去除镭或锶 水包括参考、表格、数字。

In an effort to reduce brine (i.e., chloride) use and discharge for softening and barium removal, the city of Crystal Lake, Illinois evaluated the use of calcium-form strong acid cation exchange for the removal of barium. Bench-scale pilot testing was conducted to evaluate the use of calcium chloride in lieu of sodium chloride for regenerating strong acid cation resin. The calcium-form resin was used to selectively remove the barium without affecting total hardness of the water. The selective removal of barium provides longer run cycles between regenerations and thus a considerable decrease in chloride use and discharge. The bench-scale testing was performed using 1-inch diameter glass 40- inches long with 20-inches of bed depth. The downflow service mode was operated at a flowrate of 11 bed-volumes (BV) per hour. The ion exchange column was operated until barium breakthrough was reached at 1.0 mg/L. The ion exchange system was operated at different cycles using different calcium chloride regeneration concentrations and empty bed contact times (EBCT). The use of hydrochloric acid (HCl) to restore the capacity of the resin was also evaluated in this study. The results show that the use of calcium cation exchange can successfully remove barium while significantly reducing chloride use and discharge. The same technology can be used to remove radium or strontium from the water. Includes reference, table, figures.