Process sSimulation of Desulfurization from Pyrite by Thiobacillus ferrooxidands in a Packed-Bed Medium-Recirculating Bioreactor under Different Recirculation Rates

摘要

Effect of medium-recirculation rate on desulfurization of pyrite by Thiobacillus ferrooxidans in a packed-bed bioreactor was examined for developing an efficient on-site desulfurization process of low grade coal. Linear relationship between elution rate of SO_4~(2-) and oxygen supply rate indicated that desulfurization rate was limited by dissolved oxygen (DO) supply which was dependent on the recirculation rate. Based on these results, a mathematical model consisting of DO limitation and product inhibition was constructed and satisfactorily simulated the performance in the on-site type desulfurization process.