Bacterial Oxidation and Reduction of Iron in the Processes of Creation and Treatment of Acid Mining Waters

Bacterial Oxidation and Reduction of Iron in the Processes of Creation and Treatment of Acid Mining Waters

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Acid mine drainages (AMDs) arise at the weathering of sulphidic minerals.The occurrence of acidic streams is commonly associated with the human mining activities.Due to the disruption and excavation of sulphide deposits, the oxidation processes have initiated.Acidic products of sulphide oxidation accelerate the degradation of accompanying minerals.AMDs typically contain high concentrations of sulfuric acid and soluble metals and cause serious ecological problems due to the water pollution and the devastation of adjacent country.

Microbial life in these extremely acidic environments may be considerably diverse.AMDs are abundant in bacteria capable to oxidize and/or to reduce iron.The rate of bacterial oxidation of ferrous iron released from pyrite surfaces is up Epidemiological Survey of the Main Tick-Borne Pathogens Infecting Dogs from the Republic of Moldova to one million times faster than the chemical oxidation rate at low pH.Bacterial regeneration of ferric iron maintains the continuity of pyrite oxidation and the production of AMDs.Another group of microorganisms living in these environments are acidophilic ferric iron reducing bacteria.

This group of microorganisms has been discovered only relatively recently.Acidophilic heterotrophic bacteria reduce ferric iron in either soluble or solid forms to ferrous iron.The reductive dissolution of ferric iron minerals brings about a mobilization of iron as well as associated heavy Development and Application of an Integrated System for the Detection and Prediction of Harmful Algal Blooms in Korea metals.The Bacterial oxidation and reduction of iron play an important role in the transformation of either crystalline or amorphous iron-containing minerals, including sulphides, oxides, hydroxysulfates, carbonates and silicates.This work discusses the role of acidophilic bacteria in the natural iron cycling and the genesis of acidic effluents.

The possibilities of application of iron bacteria in the remediation of AMDs are also considered.