气升式反应器中微生物烟气脱硫研究
Study on flue gas biodesulfurization in an airlift reactor
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摘要: 基于微生物酸性铁溶液烟气脱硫特性，实验构建了一套内循环气升式反应器。在反应器中，利用处于对数生长期的氧化亚铁硫杆菌（Thiobacillus ferrooxidans）酸性铁溶液进行了模拟烟道气SO2脱除实验研究。为寻求高脱硫率，实验研究了铁离子浓度、入口氧含量、细菌数和pH值的变化对脱硫率的影响。考察了反应液中Fe(II)离子浓度的变化规律。实验表明,含T.f菌酸性铁溶液的脱硫效果较高；Fe离子浓度在7.67 g/L左右时脱硫率最佳；入口气中氧含量、反应液中细菌数和pH值越高，反应液的脱硫率也就越高。反应液中的Fe(II)离子浓度是一先扬后抑的变化过程。Abstract: According to the properties of the flue gas desulfurization by acid aqueous solution with iron ion and Thiobacillus ferrooxidans (T.f), an airlift reactor of internal circulation was constructed. Experimental investigations were carried out on the removal of simulated flue gas SO2 using acid iron ion aqueous solution which contains logarithmic phase T.f in the reactor. For seeking the optimal desulfurization efficiency, the effects of the concentration of iron ion, the content of intake O2, the cell counts and the pH value were investigated. In addition, the change rule of ferrous ion in the reaction solution was explored. The experimental results showed that desulfurization efficiency was superior by acid iron ion aqueous solution which contains T.f. The optimal desulfurization efficiency was about 7.67 g/L iron ion. The desulfurization efficiency of the reaction solution increase with the content of intake O2 or the cell count and the value of pH. The change of ferrous ion concentration is a course which first is up and then is down.
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Key words:
- airlift reactor /
- Thiobacillus ferrooxidans /
- iron ion /
- flue gas desulfurization
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