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Leaching of copper and nickel in soil-water systems contaminated by bauxite residue (red mud) from Ajka, Hungary: the importance of soil organic matter

Lookup NU author(s): Dr Adam Jarvis

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Red mud is a highly alkaline (pH > 12) waste product from bauxite ore processing. The red mud spill at Ajka, Hungary, in 2010 released 1 million m(3) of caustic red mud into the surrounding area with devastating results. Aerobic and anaerobic batch experiments and solid phase extraction techniques were used to assess the impact of red mud addition on the mobility of Cu and Ni in soils from near the Ajka spill site. Red mud addition increases aqueous dissolved organic carbon (DOC) concentrations due to soil alkalisation, and this led to increased mobility of Cu and Ni complexed to organic matter. With Ajka soils, more Cu was mobilised by contact with red mud than Ni, despite a higher overall Ni concentration in the solid phase. This is most probably because Cu has a higher affinity to form complexes with organic matter than Ni. In aerobic experiments, contact with the atmosphere reduced soil pH via carbonation reactions, and this reduced organic matter dissolution and thereby lowered Cu/Ni mobility. These data show that the mixing of red mud into organic rich soils is an area of concern, as there is a potential to mobilise Cu and Ni as organically bound complexes, via soil alkalisation. This could be especially problematic in locations where anaerobic conditions can prevail, such as wetland areas contaminated by the spill.


Publication metadata

Author(s): Lockwood CL, Stewart DI, Mortimer RJG, Mayes WM, Jarvis AP, Gruiz K, Burke IT

Publication type: Article

Publication status: Published

Journal: Environmental Science and Pollution Research

Year: 2015

Volume: 22

Issue: 14

Pages: 10800-10810

Print publication date: 01/07/2015

Online publication date: 12/03/2015

Acceptance date: 24/02/2015

Date deposited: 05/04/2016

ISSN (print): 0944-1344

ISSN (electronic): 1614-7499

Publisher: Springer Berlin Heidelberg

URL: http://dx.doi.org/10.1007/s11356-015-4282-4

DOI: 10.1007/s11356-015-4282-4


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