| 贵州省务川汞矿区土法炼汞过程中汞释放量的估算 |
| 摘要点击 2423 全文点击 1829 投稿时间：2005-05-16 修订日期：2005-09-21 |
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| 中文关键词 汞释放量 汞释放因子 人为源 土法炼汞 务川汞矿区 |
| 英文关键词 mercury emission emission factors anthropogenic sources indigenous method of mercury smelting Wuchuan mercury mining areas |
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| 中文摘要 |
| 通过对酸性水溶液、含Fe3+水溶液、含Fe2+水溶液、细菌菌液和细菌培养基水溶液脱除二氧化硫的实验,探讨了微生物液相氧化二氧化硫的途径.以液相中SO42-浓度考察了Fe3+浓度、Fe2+浓度、进口SO2浓度以及温度对脱硫成酸的影响.微生物脱硫有2种机制:一是直接氧化作用,即氧化亚铁硫杆菌(Thiobacillus ferrooxidans)将S(IV)氧化成S(VI);二是间接催化氧化,氧化亚铁硫杆菌在酸性条件下具有快速氧化Fe2+成Fe3+,增强Fe3+对SO2的液相催化氧化能力,研究表明微生物脱硫以间接催化氧化为主.在浓度0～1.2g/L之间,Fe3+和Fe2+浓度越高,脱硫效果越好,氧化亚铁硫杆菌表现出对Fe3+/Fe2+体系氧化SO2的强化效果.入口SO2浓度越高,细菌脱硫效率越低,但液相中SO42-浓度随进口SO2浓度增加变化不大.温度对微生物脱硫影响较大,最佳脱硫温度为30～40℃. |
| 英文摘要 |
| The desulfurizations in dilute sulfuric acid solution,acidic ferric solution,acidic ferrous solution,microbial solution(Thiobacillus ferrooxidans) and microbial culture medium solution were conducted to discuss biodesulfurization mechanism.The effect of Fe3+ concentration,Fe2+ concentration,SO2 concentration and temperature on biodesulfurization was examined on SO42- concentration in the solution.Biodesulfurization has two ways: direct oxidation and indirect oxidation.In direct oxidation,Thiobacillus ferrooxidans oxidize S(IV) to S(VI).In indirect oxidation,Thiobacillus ferrooxidans can fast transform Fe2+ to Fe3+ in acidic conditions and then increase aqueous catalytic oxidation capacity of Fe3+ on SO2.It shows that indirect oxidation is the dominant way in biodesulfurization process.The desulfurization efficiency increase with concentration of Fe3+ or Fe2+ in the range of 0～1.2 g/L.Thiobacillus ferrooxidans enforce oxidation of SO2 in Fe3+/Fe2+ system.The removal of SO2 decrease as concentration of SO2 increase,however,concentrations of SO42- in the solution do not vary much in different inlet concentrations of SO2.Temperature has important effect on biodesulfurization.The optimal operative temperature range is 30～40℃. |
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