MICROBIAL COAL DESULFURIZATION IN AN AIRLIFT BIOREACTOR BY SULFUR-OXIDIZING BACTERIUM THIOBACILLUS-FERROOXIDANS

Microbial desulfurization of a domestic anthracite coal by using an ac idophilic, sulfur-oxidizing bacterium, Thiobacillus ferrooxidans has b een studied in an airlift slurry reactor of 12 L volume. Effects of co al slurry density and CO2 supplement on microbial pyrite removal have been evaluated. High sulfur removal rates have been obtained even for very high coal slurry densities (up to 70% w/v). About 90 similar to 9 5 % of the sulfur in the coal could be removed in 15 similar to 20 day s. The efficiency of microbial desulfurization was significantly impro ved with C0(2) enriched air supply for high coal slurry densities.