Chemical speciation in mining affected waters: the case study of Asarel-Medet mine

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Chemical speciation in mining affected waters: the case study of Asarel-Medet mine

Rabadjieva, Diana Tepavitcharova, Stefka Todorov, Tihomir and Dassenakis, Manos Paraskevopoulou, Vasiliki Petrov, Mihail

scientific_publication_article
Επιστημονική δημοσίευση - Άρθρο Περιοδικού (EL)
Scientific publication - Journal Article (EN)

2009


The inorganic chemical species in Maresh and Luda Yana rivers affected by the Cu-Mo Asarel-Medet mine, Bulgaria were determined during a low-flow and a high-flow period. The mining activities, the weathering and the oxidation processes strongly influenced the physicochemical processes in the whole water system. The main pollution source was a small lake receiving the acid effluents of the mining activities. High levels of SO42-, Cu, Mg, Al, Mn and Fe were determined at the mining polluted and affected stations. Cu2+ and CuCO30 species (1: 1) were present in the reference waters and Cu2+ and CuSO40 species (1: 1) in the polluted and affected waters; Cu2+ species was dominating downstream. Me2+ followed by MeSO40 (Me = Mn, Zn, Cd and Pb), PbCO30 and PbHCO3+ species as well as Fe(OH)(2)(+), Al(OH)(4)(-), Al(OH)(2)(+), Al(OH)(3)(0) were prevailing in the system. MeSO4+ ans Me(SO4)(2)(-) (Me = Fe, Al), Me(SO4)(2)(2-) (Me = Zn, Cd and Pb), Me(SO4)(3)(4-) (Me = Zn, Cd) and Cd(SO4)(4)(6-) species appeared in polluted and affected waters.The trace element concentrations decreased downstream due to dilution, sorption processes and precipitation, but the percentage of free metal species, which are more toxic, increased. An exception was iron and aluminum of which the dominant hydroxy colloidal and sulphate species were easily incorporated into the suspended phase. (EN)

English

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