总铬Cr（III）和六价铬[Cr（VI）]- 自年以来，一直受到国家饮用水法规的监管 1975年，总铬的联邦最高污染物水平（MCL）为 设置为100微克/升，加利福尼亚州的MCL为50微克/升。增加 公众对饮用水供应中六价铬的关注 建立Cr（VI）特定MCL的州授权，以及 在联邦和加州都有更严格的规定 引发了人们对经济高效的治疗技术的兴趣 可将Cr（VI）去除至低µg/L浓度。 本研究评估了五家供应商提供的产品的性能 确定有效治疗方案的技术 演示规模测试。这些系统包括强大的基础 阴离子和弱碱阴离子交换柱，强碱阴离子 交换和颗粒活性炭柱，磁化离子 使用连续反应器、沸石吸附介质进行交换， 然后用亚硫酸氢钠或亚硫酸钠还原 过滤。初步测试确定了几种有效的治疗方法 选项，所有这些选项都有可能从中去除Cr（VI） 饮用水的浓度低于甚至远低于5- µg/L本研究的目标。 以前的研究主要集中在将Cr（VI）降低到一定水平上 10-1000倍于该测试的目标。如果 低MCL是为Cr（VI）颁布的，或者消费者开始关注 关于饮用高浓度的水，水 公用事业经理现在有治疗选择考虑 有效降低Cr（VI）至低水平。包括21个参考文献、表格和图表。

Total chromium-Cr(III) and hexavalent chromium [Cr(VI)]- have been regulated by national drinking water regulations since 1975. The federal maximum contaminant level (MCL) for total Cr is set at 100 µg/L, and the California MCL is 50 µg/L. Increasing public concern about Cr(VI) in drinking water supplies, a California state mandate to establish a Cr(VI)-specific MCL, and the potential for stricter regulations at both the federal and California levels have sparked interest in cost-effective treatment technologies that can remove Cr(VI) to low µg/L concentrations. This research evaluated the performance of five vendor-provided technologies to identify an effective treatment option for demonstration-scale testing. The systems included strong-base anion and weak-base anion exchange columns, strong-base anion exchange and granular activated carbon columns, magnetized ion exchange using a continuous reactor, zeolite adsorptive media, and reduction with sodium bisulfite or sodium sulfite followed by filtration. The pilot testing identified several effective treatment options, all of which have the potential for removing Cr(VI) from drinking water to concentrations below or even far below the 5- µg/L goal of this research. Previous studies focused on reduction of Cr(VI) to levels 10-1,000 times greater than those targeted by this testing. If a low MCL is promulgated for Cr(VI) or consumers become concerned about drinking water with elevated concentrations, water utility managers now have treatment options to consider that effectively reduce Cr(VI) to low levels. Includes 21 references, tables, figures.