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《Environmental Science》 2007-01
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Flue Gas Desulfuration by Catalysis and Oxidation of Pyrolusite and Bacteria

WEI Wen-yun,WANG Xiang-dong,DAI Wei,JIN Yan,JIANG Wen-ju(College of Architecture and Environment,Sichuan University,Chengdu 610065,China)  
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 SO~(2-)_3 and to restore the activities of Mn(Ⅱ) and Fe(Ⅲ) in the system.Optimum bacteria were cultivated from Thiobacillus ferrooxidans and by ultraviolet radiation which has a high efficiency to the conversion of SO~(2-)_3 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 SO~(2-)_3 concentration in the aqueous phase.The modalities of manganese oxidizing bacteria before and after reaction were observed by a transmission electron microscope.The results show that the conversion rate of Thiobacillus ferrooxidans 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 SO_2 to sulfate in the process of flue gas desulfuration.Also the results from the experiments of combination of Thiobacillus ferrooxidans 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.
【Fund】: 国家自然科学基金项目(50278059)
【CateGory Index】: X701.3
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