【作者】 代伟；

【导师】 蒋文举；

【作者基本信息】 四川大学 ， 环境工程， 2006， 硕士

【摘要】 用软锰矿浆催化氧化吸收SO₂过程中，随着反应的进行，脱硫效率会显著降低。通过向软锰矿浆中加入细菌，利用微生物的作用，恢复体系中Fe、Mn对SO₂的催化活性，从而实现催化剂的再生循环，保持较高的脱硫率，是一种新的脱硫思路。软锰矿与铁、锰细菌催化氧化SO₂过程是一个涉及气、液、固三相间传质、液相中的化学反应、液固表面化学反应、氧化—还原反应、催化氧化以及微生物反应等的复杂体系。本文对软锰矿与锰氧化细菌、氧化亚铁硫杆菌联合体系的脱硫过程与机理、主要操作条件对软锰矿与细菌催化脱硫的影响、软锰矿与细菌催化氧化SO₂产酸过程的反应动力学进行了深入研究，对促进其工业应用有着重要的理论价值。 通过对软锰矿、软锰矿与锰氧化细菌、氧化亚铁硫杆菌和铁锰混合细菌四种体系的脱硫过程研究，结果表明：铁锰氧化细菌对软锰矿催化脱硫有促进作用，但细菌促进脱硫存在一个适应期，该适应期对锰细菌约为20min，对氧化亚铁硫杆菌和混合细菌约为50min；其后的强化作用随细菌浓度增加而增加。随着反应的进行，高浓度细菌反应体系产酸优势明显，体系中pH值下降趋势明显快于低浓度细菌反应体系。各反应体系中pH值最终稳定在1.0～2.0间。 研究了氧浓度和软锰矿浓度对软锰矿与细菌催化脱硫的影响。研究表明：随着氧浓度的增加，O₂向液相的传质得到加强，较高氧浓度下硫酸根的生成量明显大于较低氧浓度下硫酸根的生成量。2小时后，21％氧浓度条件下SO₄^2-浓度是5％氧浓度条件下SO₄^2-浓度的1.69～2.53倍。氧浓度大于10％对脱硫催更多还原

【Abstract】 Catalysis oxidation of SO₂ by pyrolusite slurry is a new method of flue gas desulphurization. With the reaction time increased, the desulphurization efficiency will be decreased notably. A new idea was proposed that bacteria were added into pyrolusite slurry to renew iron and manganese ion’s catalytic activities, for keeping a higher desulphurization efficiency. Catalytic oxidation of SO₂ by pyrolusite and bacterium is a complex system related to mass transfer among gas, liquid and solid phase, chemical reactions including in the aqueous phase, on the surface of solid phase. This paper studied on catalytic oxidation process of SO₂ by pyrolusite slurry, pyrolusite slurry combined with Acidithiobacillus ferrooxidans and Manganese bacteria. The effect of main operation factors on desulphurization and reaction kinetics was also discussed.The 4 kinds of desulphurization processes in pyrolusite slurry system, pyrolusite-Manganese bacteria system, pyrolusite-Acidithiobacillus ferrooxidans system, pyrolusite-mixing of Acidithiobacillus ferrooxidans and Manganese bacteria system were studied. It is shown that Acidithiobacillus and Manganese bacteria promot the oxidation for SO₂ in pyrolusite slurry, but there was an adapting phase to the positive effect of bacterium. The adapting phase is about 20min to Manganese bacteria and 50min to Acidithiobacillus ferrooxidans and mixed cell. The higher bacterium concentration system will cause the higher concentration of更多还原