Abstract
Abstract The genesis of acid mine drainage (AMD) is conditioned by existence of indigenous chemolithotrophic iron and sulfur oxidizing bacteria, especially of genus Acidithiobacillus. The result of the oxidizing weathering of metal sulfides is a sequential formation of ochreous precipitates in drainage systems and in the surroundings of AMD seepage on the surface. The long-term monitoring of AMD waters collected at the shaft Pech that receives the majority of waters draining the flooded Smolník mine area point out the enduring contamination risk of particular components in the environment of Smolník mine area. Elemental analysis, X-ray diffraction, Mossbauer spectroscopy and scanning electron microscopy of the ochreous precipitates formed from Smolník AMD stream revealed schwertmannite as the dominant solid phase in the precipitates. The chemical analysis of AMD effluents and the elemental composition of related sediments indicated considerable scavenging potential of the ochreous precipitates towards metal cations and oxyanions of arsenic and sulfate
Highlights
Acidic environment occurs naturally, though they are more frequently associated with human activities, the mining of coals and metal ores (JOHNSON, 1991)
Most research interest has focused on the iron-oxidizing bacteria since their metal mobilizing activities are exploited in the biological processing of sulphidic ores, and because their oxidation of mineral sulfides is a primary cause of acid mine drainage formation (NORRIS, 1990)
Schwertmannite formation does not require the presence of monovalent or divalent cations and removes more ferric iron and fewer sulfates from the solution phase compared to jarosite precipitation
Summary
Acidic environment (pH
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