Abstract
The treatment of acid mine drainage by neutralization produces large quantities of iron rich sludge. This iron can be recovered by acidification with H2SO4 and then used as a wastewater coagulant for phosphorus removal. In addition, a process which recycles the acid mine drainage sludge during the neutralization process has been found to require less lime while producing a sludge which requires less acid for recovery. Two acid mine drainage sludges from the field and two from the lab were analyzed and iron recovery for each was optimized for time, pH, and concentration. The optimum pH range for recovery was 1.5 to 2.0, while approximately 3 hours were required for the process. Solution iron concentrations varied from 5100 to 11,400 mg/l. It was found that the recovered iron solutions work very well when used as a wastewater coagulant.
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