Abstract
Microbial desulfurization of a domestic anthracite coal by using an acidophilic, sulfuroxidizing bacterium, Thiobacillus ferrooxidans has been studied in an airlift slurry reactor of 12 L volume. Effects of coal slurry density and CO 2 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 ∼ 95 % of the sulfur in the coal could be removed in 15 ∼ 20 days. The efficiency of microbial desulfurization was significantly improved with CO 2 enriched air supply for high coal slurry densities.
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