Application of Acidithiobacillus ferrooxidans in Desulfurization of US Coal: 10 L Batch Stirred Reactor Study

The desulfurization of coal using biological methods is an emerging technology. The biodesulfurization process uses the catalytic activity of chemolithotrophic acidpohiles in removing sulfur and pyrite from the coal. The present study was undertaken to examine the potential of Acidithiobacillus ferrooxidans in removing the pyritic sulfur and iron from high iron and sulfur containing US coal. The experiment was undertaken in 10 L batch stirred tank reactor having 10% pulp density of coal. The reactor was operated under mesophilic conditions and aerobic conditions were maintained by sparging the air into the reactor. After 35 days of experiment, about 64% of pyrite and 21% of pyritic sulfur was removed from the coal. The findings of the present study indicate that the biodesulfurization process does have potential in treating the high pyrite and sulfur containing coal. A good mass balance was also obtained with net loss of about 5% showing its feasibility for large scale application.

• Ashish Pathak
• Dong-Jin Kim
• S. Singh
• H. Srichandan
• Byoung-Gon Kim

• At.ferrroxidans
• Batch reactor
• Coal desulfurization
• Pyrite.

[1] Acharya, C., Sukla, L.B., Misra, V.N. Biodepyritisation of coal. Journal of Chemical Technology and Biotechnology 79 (1) 1-12 (2004).
[2] Li, Z.L., Sun, T.H., Jia, J.P. An extremely rapid, convenient and mild coal desulfurization new process: sodium borohydride reduction. Fuel Processing Technology 91 (9) 1162-1167 (2010).
[3] Cara, J., Vargas, M., Moran, A., Gomez, E., Martinez, 0., Garcia, F.J. Biodesulfurization of a coal by packed-column leaching. Simultaneous thermogravimetric and mass spectrometric analyses. Fuel 85: 1756-1762 (2006).
[4] Cardona, I.C., Marquez, M.A. Biodesulfurization of two Colombian coals with native microorganisms. Fuel Processing Technology 90: 1099-1106 (2009).
[5] Ivanov, I.P. Main trends in the biotechnological processing of coals: a review. Solid Fuel Chemistry 1: 3-10 (2007).
[6] Acharya, C., Kar, R., Sukla, L. Bacterial removal of sulfur from three different coals. Fuel 80: 2207-2216 (2001).
[7] Kargi, F., Robinson, J.M. Biological removal of pyritic sulphur from coal by the thermophile organisms Sulfolobus acidocaldarius. Biotechnology and bioengineering 27:41-49 (1985).
[8] Larsson, R.T. Licentiate thesis. University of Lund, Lund, Swedan (1982).
[9] Clark, T.R., Baldi, F., Olson, G.J. Coal depyritization by thermophilic archaeon metallosphaera sedula. Applied and Environmental Microbiology 59 (8): 2375-2379 (1193).
[10] Hu, J., Zheng, B., Finkleman, R.B., Wang, B., Wang, M., Li, S., Wu, D. Concentration and distribution of sixty-one elements in coals from DPR Korea. Fuel 85:679-686 (2006).
[11] Tuttle, J.H., Dugan, P. R. Inhibition of growth, iron, and sulphur oxidation in Thiobacillus ferrooxidans by simple organic compounds. Canadian Journal of Microbiology 22(5): 719-730 (1976).