ISSN 1000-3665 CN 11-2202/P

    酸性矿坑水中铁锰离子去除工艺研究

    Removal process of iron and manganese ions in acid mine water

    • 摘要: 铁离子和锰离子是酸性矿坑水中的主要特征污染物,也是矿山地下水污染治理的重点和难点。本研究针对pH值低、铁离子浓度高以及锰离子浓度超标的酸性矿坑水,构建室内石灰石中和-垂直流反应器串联实验体系,探究不同铁锰离子浓度、水力停留时间和初始pH等条件下串联体系对酸性矿坑水的处理效果。研究结果表明,串联体系中铁(Fe2+、TFe)去除率可达99%,出水总铁质量浓度可降低至0.1 mg/L以下,锰(Mn2+)去除率可达97%,出水质量浓度低于0.2 mg/L。相较于单一处理体系,出水铁锰离子浓度显著降低。X射线衍射分析结果显示,中和过程的主要产物为针铁矿、氢氧化铁等,垂直流反应器中的主要产物为针铁矿、锰氧化物等。X射线光电子能谱和扫描电镜分析结果显示,铁锰异相催化氧化以及吸附作用是串联体系铁锰被进一步去除的主要原理。研究结果证明了石灰石中和-垂直流反应器串联系统是一种处理低酸高铁低锰矿坑水的有效方法,为酸性矿坑水处理提供了新的技术思路。

       

      Abstract: Iron and manganese ions are the primary characteristic pollutants in acid mine water (AMD) and present key challenges in the treatment of contaminated mine groundwater. This study constructed a laboratory-scale limestone neutralization–vertical flow reactor system to treat AMD characterized by low pH, high iron concentrations, and elevated manganese levels. The treatment effects of series system on AMD under different conditions such as iron and manganese concentrations, hydraulic retention time, and initial pH, were investigated. The results show that the removal rate of iron (Fe2+, TFe) in the series system can reach 99%, and the total iron concentration in the effluent can be reduced to less than 0.1 mg/L, while the removal rate of manganese (Mn2+) can reach 97%, with the effluent concentration less than 0.2 mg/L. Compared with the single treatment system, the concentrations of iron and manganese in the effluent were significantly reduced. XRD analysis showed that the main products of the neutralization process were goethite and iron hydroxide, and the main products in the vertical flow reactor were goethite and manganese oxide. XPS and SEM analysis indicated that heterogeneous catalytic oxidation and adsorption were the primary mechanisms driving further removal of iron and manganese. This study presents that the limestone neutralization-vertical flow reactor series system is an effective method for treating AMD with low acidity, high iron, and low manganese mine water, providing a new technical approach for mine water remediation.

       

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