Effects of NO2− and NO3− on the Fe(III)EDTA reduction in a chemical absorption–biological reduction integrated NOx removal system
Effects of NO2− and NO3− on the Fe(III)EDTA reduction in a chemical absorption–biological reduction integrated NOx removal system
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DOI：
10.1007/s00253-008-1837-z
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发表时间：
2009-01
影响因子：
5
通讯作者：
Shihan Zhang;Ling-Lin Cai;Yun Liu;Yao Shi;Wei Li
中科院分区：
文献类型：
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作者：
Shihan Zhang;Ling-Lin Cai;Yun Liu;Yao Shi;Wei Li
乙二胺四乙酸铁（EDTA）的生物还原是化学吸收-生物还原一体化工艺去除NO的关键步骤。由于典型的烟道气含有氧气，NO吸收后吸收溶液中会存在NO2-和NO3-。在本文中，NO2-，NO3-，和Fe（III）EDTA还原的相互作用进行了研究。实验结果表明，Fe（III）EDTA还原速率随NO2-或NO3-添加量的增加而降低。在存在10 mM NO2-或NO3-的情况下，Fe（III）EDTA在第一个6 h反应期间的平均还原速率分别为0.076和0.17 mM h-1，而在不存在NO2-和NO3-的情况下为1.07 mM h-1。Fe（III）EDTA和NO2−或NO3−还原同时发生。有趣的是，在Fe（III）EDTA的存在下，NO2-或NO3-的还原率得到提高。在NO2-和NO3-对Fe（III）EDTA还原实验的影响过程中观察到的抑制模式表明，大肠杆菌利用NO2-、NO3-和Fe（III）EDTA作为末端电子受体。
The biological reduction of Fe(III) ethylenediaminetetraacetic acid (EDTA) is a key step for NO removal in a chemical absorption–biological reduction integrated process. Since typical flue gas contain oxygen, NO2−and NO3−would be present in the absorption solution after NO absorption. In this paper, the interaction of NO2−, NO3−, and Fe(III)EDTA reduction was investigated. The experimental results indicate that the Fe(III)EDTA reduction rate decrease with the increase of NO2−or NO3−addition. In the presence of 10 mM NO2−or NO3−, the average reduction rate of Fe(III)EDTA during the first 6-h reaction was 0.076 and 0.17 mM h−1, respectively, compared with 1.07 mM h−1in the absence of NO2−and NO3−. Fe(III)EDTA and either NO2−or NO3−reduction occurred simultaneously. Interestingly, the reduction rate of NO2−or NO3−was enhanced in presence of Fe(III)EDTA. The inhibition patterns observed during the effect of NO2−and NO3−on the Fe(III)EDTA reduction experiments suggest thatEscherichia colican utilize NO2−, NO3−, and Fe(III)EDTA as terminal electron acceptors.