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Lookup NU author(s): Dr Tobias Roetting
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Three laboratory column experiments were performed to test the suitability of two different MgO-rich reagents for removal of Mn and Al from the out-flowing waters of Shilbottle passive treatment system (Northumberland, UK). The input water was doped with 100 mg/L Zn in order to extrapolate results to waters in sulphide mining districts. One column was filled with a Dispersed Alkaline Substrate (DAS) containing 12.5% (v/v) caustic magnesia precipitator dust (CMPD) from Spain mixed with wood shavings, two columns were filled with DAS containing wood shavings and 12.5% or 25% (v/v), respectively, of dolomitic lime precipitator dust (DLPD) from Thrislington, UK. The two columns containing 12.5% of CMPD or DLPD completely removed the contaminants from the inflow water during the first 6 weeks of the experiment (mean removal of 88 mg/L Al, 96 mg/L Zn and 37 mg/L Mn), operating at an acidity load of 140 g acidity/m(2) day. At this moment, a substantial increase of the Al and Mn water concentration in the out-flowing waters of Shilbottle occurred (430 g acidity/m(2) day), leading to passivation of the reactive material and to the development of preferential flow paths within less than another 6 weeks, probably mainly due to Al precipitates. Al should be removed prior to MgO treatment. (C) 2010 Elsevier B.V. All rights reserved.
Author(s): Caraballo MA, Rotting TS, Silva V
Publication type: Article
Publication status: Published
Journal: Journal of Hazardous Materials
Year: 2010
Volume: 181
Issue: 1-3
Pages: 923-930
Print publication date: 01/09/2010
ISSN (print): 0304-3894
ISSN (electronic): 1873-3336
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.jhazmat.2010.05.100
DOI: 10.1016/j.jhazmat.2010.05.100
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