Kinetic study on regeneration of FeIIEDTA in the wet process of NO removal

Wu, Zhong Biao; Wang, Li; Zhao, Weirong

doi:10.1016/j.cej.2007.09.025

Cited by 22 publications

(19 citation statements)

References 26 publications

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“…Although Fe II -EDTA can obtain a high NO removal efficiency, it is easily oxidized to Fe III -EDTA that is not capable of binding NO [6,7]. Many methods [8][9][10][11] have been put forward to regenerate Fe II -EDTA to sustain the NO removal efficiency. The authors [12] put forward to utilize activated carbon as a catalyst to speed up the regeneration of iron(II)(EDTA).…”

Section: Introductionmentioning

confidence: 98%

Adsorption of EDTA on activated carbon from aqueous solutions

Zhu

Xiao

Mao

et al. 2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 98%

Adsorption of EDTA on activated carbon from aqueous solutions

Zhu

Xiao

Mao

et al. 2011

Journal of Hazardous Materials

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“…First, because the inhibitory effect of NO comes down to the suppressed overall microbial activity, the concomitant consequence of increasing N 2 O conversion efficiency is the prolonged reaction time, which is a negative factor for applications. Thus, further research can be devoted to N 2 O accumulation effect from other factors, for example, dissolved oxygen, acetylene, and sulfide addition, which are proven to be capable of triggering N 2 O accumulation by interaction with N 2 OR instead of overall activity of microorganisms. − Additionally, as Fe(II)EDTA can be partially oxidized to Fe(III)EDTA that is not capable of forming Fe(II)EDTA–NO, the regeneration process of Fe(II)EDTA is also a crucial factor for a successful application. − Therefore, a more comprehensive process with high NO removal efficiency, high N 2 O recovery, and meanwhile efficient Fe(II)EDTA regeneration should be further investigated.…”

Section: Discussionmentioning

confidence: 99%

Biological Reduction of Nitric Oxide for Efficient Recovery of Nitrous Oxide as an Energy Source

Wang

Chen

Wei

et al. 2021

Environ. Sci. Technol.

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Chemical absorption–biological reduction based on Fe(II)EDTA is a promising technology to remove nitric oxide (NO) from flue gases. However, limited effort has been made to enable direct energy recovery from NO through production of nitrous oxide (N2O) as a potential renewable energy rather than greenhouse gas. In this work, the enhanced energy recovery in the form of N2O via biological NO reduction was investigated by conducting short-term and long-term experiments at different Fe(II)EDTA–NO and organic carbon levels. The results showed both NO reductase and N2O reductase were inhibited at Fe(II)EDTA–NO concentration up to 20 mM, with the latter being inhibited more significantly, thus facilitating N2O accumulation. Furthermore, N2O accumulation was enhanced under carbon-limiting conditions because of electron competition during short-term experiments. Up to 47.5% of NO–N could be converted to gaseous N2O–N, representing efficient N2O recovery. Fe(II)EDTA–NO reduced microbial diversity and altered the community structure toward Fe(II)EDTA–NO-reducing bacteria-dominated culture during long-term experiments. The most abundant bacterial genus Pseudomonas, which was able to resist the toxicity of Fe(II)EDTA–NO, was significantly enriched, with its relative abundance increased from 1.0 to 70.3%, suggesting Pseudomonas could be the typical microbe for the energy recovery technology in NO-based denitrification.

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“…Thus NO removal efficiency drops immediately. Many methods [13][14][15][16][17] have been put forward to regenerate Fe II -EDTA to sustain the NO removal efficiency. Although iron-(III)(EDTA) can be reduced to iron(II)(EDTA) by sulfite/bisulfite ions, the regeneration rate is slow because of low rate constants and low sulfite/bisulfite concentration in limestone slurries.…”

Section: Introductionmentioning

confidence: 99%