School of Civil & Environmental Engineering, Yonsei University, 134 Shinchondong, Seoul 120-749, South Korea.
Water Sci Technol. 2010;62(9):2115-20. doi: 10.2166/wst.2010.406.
The objective of this study was to evaluate the ozone oxidation of dissolved heavy metals in an abandoned mine drainage (AMD) by conducting a pilot-scale operation at two different ozone doses of 7.5 and 24.0 g O(3)/h into an ozone reactor. A portion of the abandoned mine drainage near the Jungam Mine in Samchuck, Korea was pumped into this pilot-scale plant and used as an influent for the ozone oxidation. Some possible precipitates of metal oxides and hydroxides that resulted from the pilot-scale ozone oxidation of the dissolved Fe and Mn ions in the AMD (with a hydraulic retention time of 106 seconds in the ozone reactor) were effectively removed via sand filtration. A six-hour ozone oxidation with an ozone dose of 24.0 g O(3)/h and subsequent sand filtration, before backwashing the sand filter bed, can meet Korean drinking water quality standards (less than 0.3 mg/L) for Fe and Mn in the sand filter effluent under the operating conditions that were used in this study. The SO(4)(-2) concentrations and alkalinities of the influents were not affected by the ozone oxidation. The pH values of the influents were neutral or slightly alkaline, and after the six-hour oxidation, increased very slightly. These experiment results show that the ozone oxidation of dissolved heavy metals and the subsequent sand filtration of metal precipitates are desirable alternatives to removing heavy metals in an abandoned mine drainage.
本研究的目的是通过在两个不同的臭氧剂量（7.5 和 24.0 g O3/h）下在臭氧反应器中进行中试规模操作，评估溶解重金属在废弃矿山排水（AMD）中的臭氧氧化。将韩国 Samchuck 附近 Jungam 矿附近的一部分废弃矿山排水抽入该中试厂，作为臭氧氧化的进水。通过砂滤，可以有效去除通过中试规模臭氧氧化 AMD 中溶解的 Fe 和 Mn 离子（在臭氧反应器中的水力停留时间为 106 秒）产生的某些金属氧化物和氢氧化物的可能沉淀物。在砂滤床反冲洗之前，六小时的臭氧氧化，臭氧剂量为 24.0 g O3/h，随后进行砂滤，可以满足韩国饮用水质量标准（Fe 和 Mn 的浓度小于 0.3 mg/L）在本研究中使用的操作条件下，砂滤出水中的。进水的 SO4(-2)浓度和碱度不受臭氧氧化的影响。进水的 pH 值为中性或微碱性，氧化六小时后，仅略有增加。这些实验结果表明，溶解重金属的臭氧氧化和随后的金属沉淀物的砂滤是去除废弃矿山排水中重金属的理想替代方法。
