Effect of pH, inoculation and coal burden on bio-desulfurization of coal by Acidithiobacillus ferrooxidans LX5
pH、接种量及固形物含量对氧化亚铁硫杆菌LX5煤炭生物脱硫的影响

Great attention has been paid to the air pollution caused by combustion of high sulfur coal. Bio-desulfurization performances of Acidithiobacillus ferrooxidans LX5 at various pH, inoculation and coal burden were evaluated through batch experiment. In a strong acid culture for 15 days, when initial pH were 2.0, 2.5, 3.0 and 4.0, the desulfurization efficiency by strain LX5 quickly reached 43.1%, 73.3%, 61.9% and 37.3%, respectively. When the batch cultures were carried out 5, 10 and 15 mL of bacterial suspension, the maximum desulfurization efficiencies by strain LX5 were 44.2%, 68.1% and 72.2%, respectively. Different coal loads had strong influence on the bio-desulfurization performance of strain LX5. The maximum desulfurization efficiencies under the coal loads of 5%, 10% and 15% were 73.1%, 72.2% and 56.3%, respectively. The optimal conditions of bio-desulfurization by LX5 were initial pH of 2.5, inoculation of 10% and loads of 10%, respectively. A mean desulfurization efficiency of 69.2%, especially for pyrite sulfur removal efficiency of 78% were achieved in a 5 L sequencing batch reactor.