Pilot‐Scale Removal of Total and Hexavalent Chromium From Groundwater Using Stannous Chloride
Pilot‐Scale Removal of Total and Hexavalent Chromium From Groundwater Using Stannous Chloride
复制标题
使用氯化亚锡中试去除地下水中的总铬和六价铬
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Miguel S. Arias
中科院分区：
文献类型：
--
作者：
A. Kennedy;J. Korak;Leah C. Flint;C. Hoffman;Miguel S. Arias
从饮用水中去除六价铬（Cr（VI））的替代工艺继续受到公用事业的关注，尽管存在几种成熟的技术。氯化亚锡（SnCl 2）可以将Cr（VI）还原为三价铬，但研究有限，特别是与还原后总铬（Cr（T））的过滤性有关。在中试规模下，SnCl 2在三种地下水中的剂量范围内进行了测试，天然存在的Cr（VI）浓度范围为0.020至0.090 mg/L。研究发现，氯化亚锡在剂量<2 mg/L和接触时间<5 min时作为还原剂是有效的。锡与铬的摩尔剂量比为4足以将Cr（VI）还原至0.010 mg/L以下。在还原后，筒式过滤器实际上无法去除Cr（T），但标准设计的砂滤器能够将Cr（T）去除至<0.010 mg/L。
Alternative processes for hexavalent chromium (Cr(VI)) removal from drinking water continue to be of interest for utilities despite the existence of several established technologies. Stannous chloride (SnCl2) can reduce Cr(VI) to trivalent chromium, but research has been limited, especially related to the filterability of total chromium (Cr(T)) following reduction. At the pilot scale, SnCl2 was tested over a range of doses in three groundwaters with naturally occurring Cr(VI) concentrations ranging from 0.020 to 0.090 mg/L. Stannous chloride was found to be effective as a reductant at doses <2 mg/L and contact times <5 min. A tin‐to‐chromium molar dose ratio of 4 was sufficient for reducing Cr(VI) to below 0.010 mg/L. Cartridge filters were unable to practically remove Cr(T) following reduction, but a standard‐design sand filter was able to remove Cr(T) to <0.010 mg/L.