微生物脱硫工艺条件的研究

通过对比酸性水溶液、含Fe³⁺的酸性水溶液及细菌菌液脱除SO₂的效果,研究了Fe³⁺浓度、pH值和通气时间变化对脱硫率的影响.实验表明:酸性水溶液中SO₂的吸收仅为物理吸收;Fe³⁺能催化氧化SO₂,这种催化氧化效果随着Fe³⁺浓度的升高、pH值的增大而变得明显(pH值2.0、Fe³⁺1.5g/L时,通气时间近170min,脱硫率仍高达90%);细菌菌液脱硫的效果同样受Fe³⁺浓度、pH值的影响;氧化亚铁硫杆菌不仅具有氧化Fe²⁺的能力,还具有氧化S(Ⅳ)的能力,在Fe³⁺浓度1.5g/L,pH值1.5时效果最为明显.

Technology of Biodesulfurization from Flue Gases

The desufurization in dilute sulfuric acid solution, acidic ferric solution, and microbial solution (Thiobacillus ferrooxidans) was studied in this paper. The concentration of ferric, pH value and time all affect the rate of desulfurization. The experimental results showed that in dilute sulfuric acid solution the absorption of SO2 was a physical absorption. In acidic ferric solution, the ion of ferric can not only catalyze but also oxidize SO2. The effects of desulfurization became obvious along with high concentration of ferric and pH value. Desulfurization rate was up to 90% when pH value was 2.0 and the concentration of ferric was 1.5 g/L. In microbial solution, the effects were also influenced by the concentration of ferric and pH value. Thiobacillus ferrooxidans had an ability of oxiding the ion of ferrous and S(IV). The results of desulfurization was the best at the concentration of ferric 1.5 g/L and pH 2.0.