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Implementation of an MgO-based metal removal step in the passive treatment system of Shilbottle, UK: Column experiments

Lookup NU author(s): Dr Tobias Roetting

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Abstract

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.


Publication metadata

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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Funding

Funder referenceFunder name
Spanish Government
RITA-CT-2003-506069European Commission

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