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.

摘要: Abstract A series of pilot-scale tests were conducted with a continuous system composed stirring tank reactor, settling tank, and sand filter. In order to treat acidic drainage from Pb–Zn mine containing high levels heavy metals, the potential use coal-mine sludge (CMDS) was examined. The showed that CMDS could effectively neutralize due its alkalinity production. previous study revealed calcite goethite contained in contributed dissolutive coprecipitation complexation metals. not only has removal efficiencies (97.2–99.8%), but also large total rate constants (Ktotal, 0.21–10.18 h−1) for all More specifically, pilot much higher Zn(II) loading (45.3 g m−3 day−1) than other reference systems, such as aerobic wetland coupled algal mats anoxic limestone drains. optimum conditions found be 280 g L−1 flow 8 L day−1, necessary quantity 91.3 g L−1 day−1, replacement cycle determined 70 days.