微生物代谢与Fe^(3+)催化氧化脱除烟气中SO_2的研究  

Bio-enhanced catalytic oxidation process for removing sulfur dioxide from flue gas

作　　者：李万全[1] 张永奎[1] 巫延斌[1] 陈晓[1] 周礼[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《环境污染与防治》2006年第9期690-692,702,共4页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.20176032)。

摘　　要：利用自制的鼓泡反应器,进行了含氧化亚铁硫杆菌的酸性铁溶液脱除烟气中SO2的实验研究。结果表明,细菌直接脱硫的效果较差;Fe3+在脱硫实验过程中既有催化作用,又有氧化作用;细菌主要起氧化Fe2+为Fe3+的作用,再通过Fe3+脱硫。Fe3+存在一个最佳质量浓度,在7~8g/L左右。当初始Fe3+质量浓度为7.37g/L时,脱硫10h,其效率仍高达80%。Acclimated Thiobacillus ferrooxidans was employed to enhance the removal of sulfur dioxide from a synthetic flue gas feed stream （230 mL/min with 9000 mg SO2/m^3） in acid ferric solution contained in a small bubble reactor （200 mL）. Desulfurization was accomplished primarily by catalytic oxidation which was enhanced by the pres ence of Thiobacillus ferrooxidans. Fe^3＋ in the solution catalyzed the oxidation of absorbed SO2 to sulfate while itself was reduced to Fe^2＋ ; the bacterial metabolism oxidized Fe^2 ＋ back to Fe^3＋ and thus enabled the flue gas desulfurization （FGD） to continue. The optimal Fe^3＋ range was 7-8 g/L. Staring with a 7.4 g Fe/L solution at pH = 2.1 and 32℃, 80% removal of SO2 was still achievable after 10 hr of continuous FGD treatment.

关 键 词：氧化亚铁硫杆菌 三价铁离子 烟气脱硫 

分 类 号：X511[环境科学与工程—环境工程]