Evaluation of complexed NO reduction mechanism in a chemical absorption-biological reduction integrated NO(x) removal system

Applied Microbiology and Biotechnology
Shi-Han ZhangWei Li

Abstract

Biological reduction of nitric oxide (NO) from Fe(II) ethylenediaminetetraacetic acid (EDTA)-NO to dinitrogen (N(2)) is a core process for the continual nitrogen oxides (NO(x)) 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 N(2), 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 (N(2)O) suggests reduction of complexed NO proceeds with N(2)O as an intermediate. Some quantitative data on the stoichiometry of the reaction are experimental support that reduction of complexed NO to N(2) 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 prim...Continue Reading

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Citations

Feb 24, 2015·Bioprocess and Biosystems Engineering·Jun ChenJianmeng Chen
Oct 7, 2017·Environmental Science and Pollution Research International·Xiang-Li LongMing-Lei Jia
Sep 8, 2020·Environmental Science and Pollution Research International·Nan LiuJi-Hong Zhao
Jan 13, 2021·Environmental Science & Technology·Li-Kun WangBing-Jie Ni
Apr 7, 2009·Journal of Hazardous Materials·Jun ChenWei Zhang

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