Ferrous Ion-oxidizing In Thiobacillus ferrooxidans Batch Cultures: Influence Of Ph, temperature And Initial Concentration Of Fe~(2+)

摘要

The effects of pH, initial ferrous ion (Fe~(+2)) concentrations and temperature on Fe~(+2) oxidation by Thiobacillus ferrooxidans were examined. Ferric ions (Fe~(+3)) increased with increasing initial Fe~(+2) levels up to 2.6 g/L and, thereafter, initial Fe~(+2) concentrations higher than 2.6 g/L decreased Fe~(+3) levels. Complete Fe~(+2) oxidation, and also formation of higher Fe~(+3) amounts, could be only observed at pH 1.5. Greater pH values gave lower amounts of soluble Fe~(+3) because of the formed precipitates. The Fe~(+2) oxidation rate increased with increasing temperatures up to 301 K, and then decreased.