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Lookup NU author(s): Dr Tobias Roetting
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In the present study caustic magnesia obtained from calcination of magnesium carbonate was tested in column experiments as an alternative material for passive remediation systems to remove divalent metals. Caustic magnesia reacts with water to form magnesium hydroxide, which dissolves increasing the pH to values higher than 8.5. At these pH values, cadmium is precipitated as otavite and to a minor amount as a hydroxide. Cobalt and nickel are precipitated as hydroxides which form isostructural solids with brucite. Thus, metal concentrations as high as 75 mg/L in the inflowing water are depleted to values below 10 mu g/L. Magnesia dissolution is sufficiently fast to treat flows as high as 0.5 m(3)/m(2), day. For reactive grain size of 2-4 mm, the column efficiency ends due to coating of the grains by precipitates, especially when iron and aluminum are present in the solution.
Author(s): Rötting T, Cama J, Ayora C, Cortina J-L, De Pablo J
Publication type: Article
Publication status: Published
Journal: Environmental Science and Technology
Year: 2006
Volume: 40
Issue: 20
Pages: 6438-6443
ISSN (print): 1382-3124
URL: http://dx.doi.org/10.1021/es061092g
DOI: 10.1021/es061092g
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