【摘要】 通过对酸性水溶液、含Fe3+水溶液、含Fe2+水溶液、细菌菌液和细菌培养基水溶液脱除二氧化硫的实验,探讨了微生物液相氧化二氧化硫的途径.以液相中SO42-浓度考察了Fe3+浓度、Fe2+浓度、进口SO2浓度以及温度对脱硫成酸的影响.微生物脱硫有2种机制:一是直接氧化作用,即氧化亚铁硫杆菌(Thiobacillus ferrooxidans)将S(IV)氧化成S(VI);二是间接催化氧化,氧化亚铁硫杆菌在酸性条件下具有快速氧化Fe2+成Fe3+,增强Fe3+对SO2的液相催化氧化能力,研究表明微生物脱硫以间接催化氧化为主.在浓度0~1.2g/L之间,Fe3+和Fe2+浓度越高,脱硫效果越好,氧化亚铁硫杆菌表现出对Fe3+/Fe2+体系氧化SO2的强化效果.入口SO2浓度越高,细菌脱硫效率越低,但液相中SO42-浓度随进口SO2浓度增加变化不大.温度对微生物脱硫影响较大,最佳脱硫温度为30~40℃.更多还原

【Abstract】 The desulfurizations in dilute sulfuric acid solution,acidic ferric solution,acidic ferrous solution,microbial solution（Thiobacillus ferrooxidans） and microbial culture medium solution were conducted to discuss biodesulfurization mechanism.The effect of Fe³⁺concentration,Fe²⁺ concentration,SO₂ concentration and temperature on biodesulfurization was examined on SO^2-₄ concentration in the solution.Biodesulfurization has two ways: direct oxidation and indirect oxidation.In direct oxidation,Thiobacillus ferrooxidans oxidize S（IV） to S（VI）.In indirect oxidation,Thiobacillus ferrooxidans can fast transform Fe²⁺ to Fe³⁺ in acidic conditions and then increase aqueous catalytic oxidation capacity of Fe³⁺ on SO₂.It shows that indirect oxidation is the dominant way in biodesulfurization process.The desulfurization efficiency increase with concentration of Fe³⁺ or Fe²⁺ in the range of 0～1.2 g/L.Thiobacillus ferrooxidans enforce oxidation of SO₂ in Fe³⁺/Fe²⁺ system.The removal of SO₂ decrease as concentration of SO₂ increase,however,concentrations of SO^2-₄ in the solution do not vary much in different inlet concentrations of SO₂.Temperature has important effect on biodesulfurization.The optimal operative temperature range is 30～40℃.更多还原