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In this study, sulfate-reducing bioreactors (SRBRs) efficiently treated acid mine drainage (AMD) for a contiguous period of 5 months. The AMD was sourced from an active coal mine on the South Island of New Zealand and typically had a pH < 3, 1,700 mg/L of sulfate, 50 mg/L of Fe, 18 mg/L of Al, 15 mg/L of Mn, 4 mg/L of Zn, and lower concentrations of other contaminants. Two alkalinity-generating...