针对硅钢钝化液废水利用NaHSO_3处理Cr6+、CODcr超标的难题,改用FeSO4和H2O2为处理剂,利用Fe2+的还原性和在酸性条件下Fe2+与H2O2形成Fenton试剂的催化氧化特性,对废水中的Cr6+和CODcr,进行同步去除.FeSO4/H2O2处理硅钢钝化液废水适宜参数为:n(Fe2+):n(H2O2)=1:2、Fe2+投加量n(Fe2+):n(Cr6+)=5.2:1、pH值3-4、温度15-35℃.在此条件下,可使初始浓度为Cr6+=2959mg/L、CODcr=1351mg/L的废水,处理后Cr6+、CODcr分别降为0.421mg/L、25.6mg/L,去除率为99.99%和98.11%,达到了<钢铁工业水污染物排放标准>(GB13456-92)中的一级排放要求.
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