Toggle Main Menu Toggle Search

Open Access padlockePrints

Use of caustic magnesia to remove cadmium, nickel, and cobalt from water in passive treatment systems: Column experiments

Lookup NU author(s): Dr Tobias Roetting

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

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.


Publication metadata

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


Altmetrics

Altmetrics provided by Altmetric


Share