用Fenton试剂处理福建某铜锌选矿废水

福建某铜锌选矿厂经过混凝沉降初级处理后的生产废水清澈透明，pH为中性，固体悬浮物和重金属离子含量达到国家排放标准，但由于含大量丁黄药等有机质而使COD值高达377.2 mg/L，既不能直接排放也不能直接回用。为将该废水的COD值降到100 mg/L以下以满足排放或回用的要求，采用Fenton试剂对其进行了去除COD的试验研究。试验结果表明：在初始pH为3、H₂O₂溶液（浓度30%）用量为2 mL/L、FeSO₄·7H₂O用量为0.5 g/L的条件下搅拌反应60 min，废水的COD值可降低至25.2 mg/L，相应的COD去除率高达93.32%，从而显示出Fenton试剂降解有色金属矿选矿废水中黄药等有机质的高效性。

Wastewater Treatment from Fujian Copper Zinc Ore Flotation Plant with Fenton Reagent

The production wastewater from a copper and zinc dressing plant in Fujian appears clear with neutral Ph value after primarily treated by the flocculating setting process.The content of suspended solids and heavy metal ion in wastewater reach the national emission standards，but it contains a lot of organic matter，such as butyl xanthate lifting the COD value up to 377.2 mg/L，neither directly discharged nor directly reused.In order to drop the COD value to be 100 mg/L or less to meet the requirement of discharge or reuse，Fenton reagent was adopted to carry out the experiments for removal of COD.The results showed that:with the initial pH of 3，the dosage of H₂O₂ solution(30% in concentration) 2 mL/L，and dosage of FeSO₄·7H2O 0.5 g/L，and stirring for 60 min，COD value in the wastewater was reduced to 25.2 mg/L，and the corresponding COD removal was up to 93.32%，thus showing that Fenton reagent own a high efficiency in the degradation of xanthate and other organic matter in wastewater from beneficiation of non-ferrous metal ore.