Effect of Pulp Density on Biodesulfurization of Mongolian Lignite Coal

Authors: Ashish Pathak, Dong-Jin Kim, Byoung-Gon Kim

Abstract:

Biological processes based on oxidation of sulfur compounds by chemolithotrophic microorganisms are emerging as an efficient and eco-friendly technique for removal of sulfur from the coal. In the present article, study was carried out to investigate the potential of biodesulfurization process in removing the sulfur from lignite coal sample collected from a Mongolian coal mine. The batch biodesulfurization experiments were conducted in 2.5 L borosilicate baffle type reactors at 35 ºC using Acidithiobacillus ferrooxidans. The effect of pulp density on efficiency of biodesulfurization was investigated at different solids concentration (1-10%) of coal. The results of the present study suggested that the rate of desulfurization was retarded at higher coal pulp density. The optimum pulp density found 5% at which about 48% of the total sulfur was removed from the coal.

Keywords: Biodesulfurization, bioreactor, coal, pyrite.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1112145

References:

[1] Gungor, A. “Prediction of SO2 and NOx emissions for low grade Turkish lignites in CFB combustors” Chemical Engineering Journal. Vol. 146, p. 388-400, 2012.
[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. Vol. 91 (9), p. 1162–1167, 2010.
[3] Vaccaro, S. “Demineralization and desulfurization process to generate clean coal” Chemical Engineering Transactions. Vol. 21, p.1489-1494, 2010.
[4] Cardona, I.C., Marquez, M.A. “Biodesulfurization of two Colombian coals with native microorganisms” Fuel Processing Technology. Vol. 90, p. 1099-1106, 2009.
[5] Aditiawati, P., Akhmaloka, Astuti, D.I., Sugilubin, Pikoli, M.R. “Biodesulfurization of subbituminous coal by mixed culture bacteria isolated from coal mine soil of south Sumatra” Biotechnology. Vol. 12(1), p. 46-53, 2013.
[6] Acharya, C., Kar, R., Sukla, L. “Bacterial removal of sulfur from three different coals” Fuel. Vol. 80, p. 2207-2216, 2001.
[7] Golshani, T., Jorjani, E., Chelgani, S.C., Shafaei, S.Z., Nafechi, Y.H. “Modelling and process optimization for microbial desulfurization of coal by using a two-level full factorial design” International Journal of Mining Science and Technology, Vol. 23(2), p. 261-265, 2013.
[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 metallosphaerasedula” Applied and Environmental Microbiology, Vol. 59 (8), p. 2375-2379, 1993.
[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, Vol. 85, p.679-686, 2006.
[11] Pandey, R.A., Raman, V.K., Bodkhe, S.Y., Handa, B.K., Bal, A.S. “Microbial desulphurization of coal containing pyritic sulphur in a continuously operated bench scale coal slurry reactor” Fuel. Vol. 84, p. 81-87, 2004.