Abstract
This study evaluated the effectiveness of using barium bicarbonate to remove sulphate from neutralized AMD. The Ba(HCO3)2 was produced by dosing a BaCO3 solution with CO2 to form Ba(HCO3)2. This greatly increased the barium ion concentration, which rapidly removed sulphate linked to either calcium or magnesium. Following sulphate removal, the Ca(HCO3)2 or Mg(HCO3)2 containing water can be stabilised by CO2 stripping with air, which results in CaCO3 precipitation. The MgCO3 remains in solution.
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