处理步骤是先加硫酸亚铁使之沉淀，然后过滤。
The treatment sequence involved addition of ferrous sulfate for precipitation, and subsequence filtration .
对硫酸亚铁法处理电镀含氰废水进行了试验研究，探讨了硫酸亚铁除氰的原理及其去除效果。
This paper studies the treatment of electroplating CN-contained wastewater by ferrous sulfate, and investigates the elements and the effect of this treatment.
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