矿山酸碱混合废水的氧化处理

针对某铜矿矿山酸性废水具有低pH值,含大量Fe3+、Fe2+以及Cu2+等金属离子和浮选废水中存在大量残留浮选药剂,废水COD较高等特点,分别研究了NaClO,O3和Fe2+/H2O2三种氧化剂对该混合废水中残留浮选药剂的降解处理效果.研究表明:利用H2O2氧化方法降低混合废水的COD是可行的,而NaClO和O3的氧化效果则较差;H2O2最佳的投加浓度为340mg/L时,COD的去除率可达91.6%.对H2O2氧化机理的研究表明,混合废水中的Fe2+与H2O2在低pH值下反应生成活性自由基是残留浮选药剂去除的关键.最后,应用动力学模型对Fenton氧化反应进行了模拟.

Treatment of Acid-Alkali Mixed Mine Wastewater with Oxidation Process

Acid mine drainage(AMD) in a copper mine is characterized as low pH and high concentrations of metal ions such as Fe3+,Fe2+ and Cu2+,while flotation wastewater often contains amounts of residual flotation reagents,which lead to high COD(chemical oxygen demand) value.AMD and flotation wastewater were firstly pre-mixed at a ratio of 1∶1 and then were treated by use of NaClO,O3 and Fe2+/H2O2 oxidation techniques respectively.The experimental results indicate that H2O2 as the oxidants is feasible and effective for the treatment of the mixed wastewater,while NaClO and O3 oxidation exhibites poor degradation efficiency towards COD removal.91.6% COD of the mixed wastewater can be removed when the optimum H2O2 dosage(340 mg/L) was applied.The high reactive free radical generated from the Fenton reaction may be responsible for COD elimination.Fenton reaction mechanism was discussed by fitting a two-step kinetic model.