Biodesulphurized subbituminous coal by different fungi and bacteria studied by reductive pyrolysis. Part 1: Initial coal

摘要

One of the perspective methods for clean solid fuels production is biodesulphurization. In order to increase the effect of this approachudit is necessary to apply the advantages of more informative analytical techniques. Atmospheric pressure temperature programmingudreduction (AP-TPR) coupled with different detection systems gave us ground to attain more satisfactory explanation of the effects ofudbiodesulphurization on the treated solid products.udSubbituminous high sulphur coal from ‘‘Pirin” basin (Bulgaria) was selected as a high sulphur containing sample. Different types ofudmicroorganisms were chosen and maximal desulphurization of 26% was registered. Biodesulphurization treatments were performed withudthree types of fungi: ‘‘Trametes Versicolor” – ATCC No. 200801, ‘‘Phanerochaeta Chrysosporium” – ME446, Pleurotus Sajor-Caju andudone Mixed Culture of bacteria – ATCC No. 39327. A high degree of inorganic sulphur removal (79%) with Mixed Culture of bacteriaudand consecutive reduction by 13% for organic sulphur (Sorg) decrease with ‘‘Phanerochaeta Chrysosporium” and ‘‘Trametes Versicolor”udwere achieved.udTo follow the Sorg changes a set of different detection systems i.e. AP-TPR coupled ‘‘on-line” with mass spectrometry (AP-TPR/MS),udon-line with potentiometry (AP-TPR/pot) and by the ‘‘off-line” AP-TPR/GC/MS analysis was used. The need of applying differentudatmospheres in pyrolysis experiments was proved and their effects were discussed. In order to reach more precise total sulphur balance,udoxygen bomb combustion followed by ion chromatography was used.