膜分離と電気透析操作を伴うThiobacillus ferrooxidansの反復回分培養によるパイライトイオウの溶解

概要

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The solubilization of pyritic sulfur by Thiobacillus ferrooxidans Y5-9 was inhibited by SO42- (product resulting from the solubilization process) above its concentration of 150 mol/m3. In the repeated batch culture of T. ferrooxidans Y5-9 with a membrane-type bioreactor, the SO42- level in filtrate was kept less than about 150 mol/m3 by electrodialysis with SO42- removal. As a result, the solubilization activity of the bacterium was maintained throughout a culture of 600 h, and the values of average sulfate fromation rate in three times-repeated batch cultures during 600 h were 0.71 (the first batch), 0.42 (the second batch) and 0.38 (the third batch) mol/ (m3·h).