利用弱碱阴离子交换树脂去除饮用水源中微量铬(Ⅵ)

Removal of chromate(Ⅵ) from drinking water by weak base anion exchange resins

针对中国部分地区饮用水源中出现的不同程度重金属铬 ( )污染 ,提出了利用弱碱阴离子交换树脂选择性去除水源中痕量铬 ( )的工艺路线。静态和动态实验表明 :在所研究的外界条件下 ,弱碱阴离子树脂对铬 ( )的吸附等温线可以近似为线形 ;尽管天然水体中存在常量的 SO2 -4 ,NO-3 ,Cl-等同类阴离子 ,弱碱阴离子交换树脂 (如 IRA- 6 7和 Purolite A845 )仍能够有效去除其中的痕量铬 ,并能同时去除部分有机污染物。该工艺具有运行周期长 。

This paper studied the use of weak base anion exchange resins to remove the trace pollutant Cr(Ⅵ) from drinking water resources. The results demonstrated that for some conditions the isotherm curves are linearly related to the adsorption of Cr by the weak base anion exchange resins. Chromate anions can be effectively eliminated by the weak base anion exchange resins (e.g., IRA-67 and Purolite A845) even with sulfate, nitrate, chloride and other competitive anions at normal concentrations in natural water. Parts of the organic matter were also removed. This process has excellent potential for the removal of Cr(Ⅵ) with a long service period and simple regeneration.