State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 10012, China.
School of Environment, Liaoning University, Shenyang, 110036, Liaoning, China.
Environ Sci Pollut Res Int. 2023 Nov;30(55):117970-117980. doi: 10.1007/s11356-023-30378-y. Epub 2023 Oct 24.
Red mud is an environmental burden during the alumina production process. To mitigate the hazards associated with red mud storage, this study investigated the utilization of alkaline red mud as a treatment agent for acidic mine drainage (AMD) with high concentrations of Fe(II) and Mn(II). This study explored the influence of reaction times, addition amounts of red mud, and pH values on the removal efficiency of Fe (II) and Mn(II) from high-concentration AMD. Various parameters such as suspended solids levels, effluent pH, and zeta potentials were measured to meet discharge standards. The adsorption mechanism of red mud was examined using SEM, XRD, EDX, XPS, and 3D-EEM analysis. Optimal conditions were determined as a reaction time of 2 h, pH value of 5.01 and the addition of 100 g/L red mud, achieving effective removal of Fe(II) (reduced from 1000 to 0.224 mg/L) and Mn (II) (reduced from 20 to 1.03 mg/L). The treated AMD meets discharge standards with reduced suspended matter content of 37.4 mg/L. These findings provided valuable insights for the utilization of red mud waste in engineering applications.
赤泥是氧化铝生产过程中的环境负担。为了减轻赤泥储存带来的危害，本研究探讨了利用碱性赤泥作为处理剂处理高浓度 Fe(II)和 Mn(II)的酸性矿山排水（AMD）。本研究考察了反应时间、赤泥添加量和 pH 值对高浓度 AMD 中 Fe(II)和 Mn(II)去除效率的影响。通过测量悬浮固体水平、出水 pH 值和 ζ 电位等参数，以满足排放标准。通过 SEM、XRD、EDX、XPS 和 3D-EEM 分析研究了赤泥的吸附机理。确定的最佳条件为反应时间 2 h、pH 值 5.01 和添加 100 g/L 赤泥，实现了对 Fe(II)（从 1000 降低至 0.224 mg/L）和 Mn(II)（从 20 降低至 1.03 mg/L）的有效去除。处理后的 AMD 悬浮物质含量降低至 37.4 mg/L，符合排放标准。这些发现为赤泥废物在工程应用中的利用提供了有价值的见解。
