化学沉淀法去除电镀废水中铬的实验研究

Removing Chromium from Electroplating Wastewater by Chemical Precipitation

文章采用化学沉淀的方法处理含铬电镀废水,以FeSO4还原电镀废水中的Cr6+,转化为危害较小的Cr3+,并通过调pH使之形成Cr(OH)3沉淀。反应过程中涉及的影响因素有还原剂投加量、Cr6+被还原时的pH值、转化为Cr3+时的pH值、电镀废水中Cr的初始浓度等。通过实验研究获得了上述影响因素的最佳参数值。最后实验效果表明:化学沉淀法能够快速、有效地去除电镀废水中的铬,总铬去除率在90%左右。

This paper reports a bench-scale experiment on treatment of electroplating wastewater containing Cr（Ⅳ）, Cu and other heavy metals, focusing on removing Cr by oxidation-reduction reactions using FeSO4 as the reductant, which lead to the formation of precipitation of chromic hydroxide. Based on the experiment optimum condition in terms of pH and dosage of the reductant is obtained.