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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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Abstract

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−1 in 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 that Escherichia coli can utilize NO2 , NO3 , and Fe(III)EDTA as terminal electron acceptors.

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Acknowledgment

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., Cai, L., Liu, Y. et al. Effects of NO2 and NO3 on the Fe(III)EDTA reduction in a chemical absorption–biological reduction integrated NOx removal system. Appl Microbiol Biotechnol 82, 557–563 (2009). https://doi.org/10.1007/s00253-008-1837-z

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Keywords

  • NO2
  • NO3
  • Fe(III)EDTA
  • Biological reduction
  • Inhibition