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为了解决某大型铜矿废水COD不达标问题,采用Fenton氧化对原有高浓度泥浆(HDS)工艺进行改进。探讨了Fenton氧化矿山废水各指标的去除效果以及H2O2浓度对出水COD去除效果的影响,结果表明,Fenton氧化-电石乳中和-絮凝-沉淀工艺处理矿山废水是可行的,最优实验条件为:pH稳定在3.0～4.5,H2O2投加量0.5 mL/L,电石乳投加量8.5 g/L,PAM投加量1.5 mg/L;系统对废水COD的去除机理是加入的H2O2和矿山酸性废水中的Fe2+离子在低pH下形成Fenton试剂;系统对TFe、Zn2+、Cu2+的去除效果比Mn2+的去除效果更稳定。
In order to solve the problem of non-compliance of COD in a large copper mine wastewater, Fenton oxidation was used to improve the original HDS process. The effects of removal of various indicators of Fenton oxidation mine wastewater and the effect of H2O2 concentration on effluent COD removal were discussed. The results show that it is feasible to treat mine wastewater with Fenton oxidation - electrification rock - coagulation - precipitation process. The optimal experimental conditions are as follows: The pH was stable at 3.0-4.5, the dosage of H2O2 was 0.5 mL / L, the dosage of calcium carbide emulsion was 8.5 g / L, the dosage of PAM was 1.5 mg / L. The removal mechanism of COD in wastewater system was the addition of H2O2 and mine acid wastewater Fe2 + ions formed Fenton reagent at low pH. The removal of TFe, Zn2 + and Cu2 + was more stable than that of Mn2 + removal.