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Evaluation of complexed NO reduction mechanism in a chemical absorption–biological reduction integrated NOx removal system

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Abstract

Biological reduction of nitric oxide (NO) from Fe(II) ethylenediaminetetraacetic acid (EDTA)-NO to dinitrogen (N2) is a core process for the continual nitrogen oxides (NOx) removal in the chemical absorption–biological reduction integrated approach. To explore the biological reduction of Fe(II)EDTA-NO, the stoichiometry and mechanism of Fe(II)EDTA-NO reduction with glucose or Fe(II)EDTA as electron donor were investigated. The experimental results indicate that the main product of complexed NO reduction is N2, as there was no accumulation of nitrous oxide, ammonia, nitrite, or nitrate after the complete depletion of Fe(II)EDTA-NO. A transient accumulation of nitrous oxide (N2O) suggests reduction of complexed NO proceeds with N2O as an intermediate. Some quantitative data on the stoichiometry of the reaction are experimental support that reduction of complexed NO to N2 actually works. In addition, glucose is the preferred and primary electron donor for complexed NO reduction. Fe(II)EDTA served as electron donor for the reduction of Fe(II)EDTA-NO even in the glucose excessive condition. A maximum reduction capacity as measured by NO (0.818 mM h−1) is obtained at 4 mM of Fe(II)EDTA-NO using 5.6 mM of glucose as primary electron donor. These findings impact on the understanding of the mechanism of bacterial anaerobic Fe(II)EDTA-NO reduction and have implication for improving treatment methods of this integrated approach.

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Acknowledgement

This work was sponsored by the National High Technology Research and Development Program of China (No. 2006AA06Z345), the National Natural Science Foundation of China (No. 20676120), and the Science and Technology Project of Zhejiang Province, China (No. 2006C23064).

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Correspondence to Wei Li.

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Zhang, S., Mi, X., Cai, L. et al. Evaluation of complexed NO reduction mechanism in a chemical absorption–biological reduction integrated NOx removal system. Appl Microbiol Biotechnol 79, 537–544 (2008). https://doi.org/10.1007/s00253-008-1469-3

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Keywords

  • Fe(II)EDTA-NO
  • Electron donor
  • Biological reduction
  • Mechanism
  • Stoichiometry