Evaluation of NO Removal from Flue Gas by a Chemical Absorption鈥揃iological Reduction Integrated System: Complexed NO Conversion Pathways and Nitrogen Equilibrium Analysis

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• 作者：Wei Li ; Lei Zhang ; Nan Liu ; Yun Shi ; Yinfeng Xia ; Jingkai Zhao ; Meifang Li
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：July 17, 2014
• 年：2014
• 卷：28
• 期：7
• 页码：4725-4730
• 全文大小：373K
• ISSN：1520-5029

文摘

The conversion of complexed nitrogen oxide [Fe(II)EDTA鈥揘O] is the core process in the chemical absorption鈥揵iological reduction (CABR) integrated system. Additionally, flue gas of power plants in China contains 3鈥?% oxygen (O₂), which plays a dominant role in the system. However, previous studies on the reduction of complexed NO were conducted in strictly anaerobic vials. Nitrogen utilization for microorganism growth was not taken into consideration. In this study, the mechanism and conversion pathways of complexed NO were investigated with 0鈥?0% O₂. Results demonstrated that, with O₂, except for being complexed as Fe(II)EDTA鈥揘O, a part of NO was oxidized to NO₂. Then, Fe(II)EDTA鈥揘O and NO₂ were oxidized to NO₂^{鈥?/sup>/NO₃鈥?/sup> via nitrosification/nitrification or direct chemical reaction, and NO₂鈥?/sup>/NO₃鈥?/sup> were reduced to N₂ by complexed NO-reducing bacteria. Besides, 75% of nitrogen was discharged by gas, mainly as N₂. There was 18 and 3% of nitrogen accumulated in biological and liquid phases, respectively.}