Abstract
The kinetics of removal of inorganic sulfur (FeS 2 ) in coal by Triobacillus ferroxidans was studied in a we mixed batch reactor. Experiments were made at 30 o C and pH 2.0 on adsorption of the bacteria to coal particles and bacterial desulfurization. In the adsorption experiments, it was found that T. ferrooxidans was selectively adsorbed on inorganic sulfur in coal and that the equilibrium data obeyed the Langmuir isotherm. The coal desulfurization was found to occur by a direct bacterial oxidation of FeS 2 , the chemical oxidation via ferric iron being insignificant. The FeS 2 in coal was completely oxidized to sulfate ion, and the maximum conversion of 82% was achieved within two weeks
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