软锰矿微生物催化氧化烟气脱硫  

Flue Gas Desulfuration by Catalysis and Oxidation of Pyrolusite and Bacteria

作　　者：魏文韫[1] 王向东[1] 代伟[1] 金燕[1] 蒋文举[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065

出　　处：《环境科学》2007年第1期48-52,共5页Environmental Science

基　　金：国家自然科学基金项目(50278059)

摘　　要：利用软锰矿与微生物联合催化氧化烟气SO2.分别选取氧化亚铁硫杆菌(T.ferrooxidans菌)和锰氧化细菌,研究微生物对SO32-的氧化性能和恢复体系中Mn(Ⅱ)和Fe(Ⅲ)的活性性能.采用紫外线诱变法,选育出了对SO32-和Fe2+转化效率高T.ferrooxidans菌的优势菌株,对Fe2+的完全氧化时间缩短为约24 h.通过分析细菌与软锰矿联合催化氧化脱除SO2的脱硫效率变化、液相中SO32-离子的变化,以及二者的关系,探讨了细菌在软锰矿脱硫体系中所起的作用,并用透射电子显微镜观察了反应前后锰氧化细菌的形态变化.结果表明Fe2+与T.ferrooxidans菌共同存在时,T.ferrooxidans菌对SO32-的转化速率可达到0.015 3 g/(L.min),优于化学氧化.T.ferrooxidans菌和锰氧化菌联合软锰矿脱硫实验结果表明,细菌对软锰矿脱硫存在强化作用;锰氧化细菌促进脱硫存在适应期,T.ferrooxidans菌和锰氧化菌存在协同效应,微生物可以完成铁锰催化剂的再生循环.A new method for flue gas desulfuration was carried out by catalysis and oxidation of pyrolusite and bacteria. Thiobacillus ferrooxidans and Manganese oxidizing bacteria were chosen to investigate the abilities of bacteria to oxidize SO3^2- and to restore the activities of Mn（ Ⅱ ） and Fe（ Ⅲ ） in the system. Optimum bacteria were cultivated from Thiobacillusferrooxidans and by ultraviolet radiation which has a high efficiency to the conversion of SO3^2- and Fe^2＋ . The time needed for complete oxidation of Fe^2＋ to Fe^3＋ by the optimum bacteria is reduced to 24 hours approximately. The function of bacteria in the system was discussed by analyzing the desulfuration rate and SO3^2- concentration in the aqueous phase. The modallties of manganese oxidizing bacteria before and after reaction were observed by a transmission electron microscope. The results show that the conversion rate of Thiobacillusferrooxidans coexisting with Fe^2＋ is 0.015 3 g/（ L·min）, which is higher than chemical oxidation. All the bacteria can realize a cycling regeneration of Mn（ Ⅱ ） and Fe（ Ⅲ ） which is necessary to oxidize SO2 to sulfate in the process of flue gas desulfuration. Also the results from the experiments of combination of ThiobaciUusferrooxidans and Manganese oxidizing bacteria prove that bacteria can strengthen the reaction and have a period of accommodation. There is a kind of synergistic effect to improve the desulfuration between Thiobacillus ferrooxidans and manganese oxidizing bacteria.

关 键 词：氧化亚铁硫杆菌 锰氧化细菌 软锰矿 二氧化硫 生物脱硫 透射电子显微技术 

分 类 号：X701.3[环境科学与工程—环境工程]