A continuous pilot-scale system using coal-mine drainage sludge to treat acid mine drainage contaminated with high concentrations of Pb, Zn, and other heavy metals

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• 作者：Mingcan Cui^a ; ^b ; Min Jang^c ; ^{mjang@mireco.or.kr} ; Sang-Hyun Cho^c ; Jeehyeong Khim^a ; ^{hyeong@korea.ac.kr} ; Fred S. Cannon^d
• 关键词：Sludge ; Acid mine drainage ; Heavy metal ; Stirring tank reactor
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 May, 2012
• 卷：215-216
• 期：Complete
• 页码：122-128
• 文件大小：515 K

摘要

A series of pilot-scale tests were conducted with a continuous system composed of a stirring tank reactor, settling tank, and sand filter. In order to treat acidic drainage from a Pb-Zn mine containing high levels of heavy metals, the potential use of coal-mine drainage sludge (CMDS) was examined. The pilot-scale tests showed that CMDS could effectively neutralize the acidic drainage due to its high alkalinity production. A previous study revealed that calcite and goethite contained in CMDS contributed to dissolutive coprecipitation and complexation with heavy metals. The continuous system not only has high removal efficiencies (97.2-99.8%), but also large total rate constants (K_total, 0.21-10.18 h^鈭?) for all heavy metals. More specifically, the pilot system has a much higher Zn(II) loading rate (45.3 g m^鈭? day^鈭?) than other reference systems, such as aerobic wetland coupled with algal mats and anoxic limestone drains. The optimum conditions were found to be a CMDS loading of 280 g L^鈭? and a flow rate of 8 L day^鈭?, and the necessary quantity of CMDS was 91.3 g L^鈭? day^鈭?, as the replacement cycle of CMDS was determined to be 70 days.