Experimental study on oxidation of elemental mercury by UV/Fenton system
Experimental study on oxidation of elemental mercury by UV/Fenton system
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UV/Fenton体系氧化单质汞的实验研究
DOI：
10.1016/j.cej.2013.07.082
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发表时间：
2013-10
影响因子：
15.1
通讯作者：
Jinfeng Ma
中科院分区：
文献类型：
--
作者：
Xing Zhang;Lingkui Zhao;Jie Zhang;Jinfeng Ma
为了在湿式洗涤器中实施 Hg0 控制策略，研究了 UV/Fenton 系统对模拟燃煤烟气中元素汞 (Hg0) 的氧化。研究了不同操作参数的影响，包括初始溶液pH、H2O2、TiO2和Fe2+浓度、溶液温度、气体流量和烟气组分（O2、SO2和NO）。分析了溶液中的主要离子产物。实验结果表明，随着初始溶液pH值和气体流量的增加，Hg0的氧化受到抑制。此外，随着H2O2、TiO2、Fe2+浓度和溶液温度的增加，Hg0氧化效率先增强至最大，然后下降。当烟气中不含O2时，SO2和NO能显着抑制Hg0的氧化，但当烟气中存在9%O2时，氧化能力又恢复。 SO2对Hg0氧化有抑制作用，但SO2浓度较高时抑制作用减弱。实验条件下不同NO浓度对Hg0氧化过程影响不显着。在存在和不存在烟气组分（9% O2、800 ppm SO2、600 ppm NO）的情况下，在最佳条件（pH=1、[H2O2]=0.05mol/L；[TiO2]=0.6g/L；[Fe2+]/[H2O2]=1/2；T=40℃）下，平均氧化效率为Hg0可分别达到94.4%和98.5%。
In order to implement Hg0control strategy in a wet scrubber, oxidation of elemental mercury (Hg0) in the simulated coal-fired flue gas by UV/Fenton system was investigated. Effects of different operation parameters have been studied, including initial solution pH, H2O2, TiO2and Fe2+concentration, solution temperature, gas flow rate and flue gas components (O2, SO2and NO). The main ion products in the solution have been analyzed. The experimental results suggested that oxidation of Hg0was inhibited with the increase of initial solution pH and gas flow rate. Additionally, with the increase of the H2O2, TiO2, Fe2+concentration and solution temperature, the Hg0oxidation efficiency was enhanced to the maximum at first and then decreased. Hg0oxidation can be significantly inhibited by SO2and NO when the flue gas was absence of O2, but the oxidation capacity was recovered with 9% O2exist in the flue gas. SO2showed an inhibition effect on Hg0oxidation, while the inhibition was weakened at higher SO2concentration. Different NO concentration had an insignificant effect on Hg0oxidation process under the experimental conditions. In the case of presence and absence of flue gas components (9% O2, 800 ppm SO2, 600 ppm NO) and under the optimal conditions (pH = 1, [H2O2] = 0.05 mol/L; [TiO2] = 0.6 g/L; [Fe2+]/[H2O2] = 1/2;T= 40 °C), the average oxidation efficiency of Hg0can reach to 94.4% and 98.5%, respectively.
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12.8
作者：
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影响因子：
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作者：
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通讯作者：
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