Reduction of Fe(II)EDTA‐NO using Paracoccus denitrificans and changes of Fe(II)EDTA in the system

Abstract

BACKGROUND: In the BioDeNOX technology for NOX removal from flue gas, bioreduction of Fe(II)EDTA‐NO and Fe(III)EDTA are core processes. In this study, a newly isolated strain, Paracoccus denitrificans, was used to reduce Fe(II)EDTA‐NO with glucose and Fe(II)EDTA as donor electrons. To better understand the change law of Fe(II)EDTA, the process of Fe(II)EDTA‐NO reduction by P. denitrificans with glucose and Fe(II)EDTA as electron donors was investigated, and the factors that might affect Fe(II)EDTA concentration were studied. RESULTS: For the bioreduction process of Fe(II)EDTA‐NO, P. denitrificans could use glucose and Fe(II)EDTA as electron donors. At different stages, primary electron donors were different, thereby affecting the concentration of Fe(II)EDTA in the system. It was also proved that this strain not only reduced Fe(III)EDTA with glucose as the electron donor but also secreted several substances that reacted with Fe(III)EDTA, resulting in increased Fe(II)EDTA concentration in the solution. CONCLUSIONS: This work has shown that P. denitrificans can reduce Fe(II)EDTA‐NO and Fe(III)EDTA simultaneously to regenerate NOX absorption solution. © 2012 Society of Chemical Industry

Evaluation of a newly isolated Klebsiella sp. DL-1 and its interaction with Klebsiella sp. FD-3 in regenerating nitrogen oxide scrubbing liquor using ethylenediaminetetraacetic acid iron(II) as absorbent

“…However, their reductions either take a long time or exhibit unsatisfactory efficiencies. Some researchers therefore proposed to find new strains that could reduce Fe(II)EDTA-NO and Fe(III)EDTA simultaneously (Chen et al,2015;Dong et al, 2012;Dong et al 2014;Li et al, 2013;Liu et al, 2011 andZhang et al, 2007).…”

Simultaneous Biological and Chemical Removal of Sulfate and Fe(II)EDTA-NO in Anaerobic Conditions and Regulation of Sulfate Reduction Products

“…Other studies have shown that N 2 O accumulation was inhibited with a high C/N ratio, sufficient electron donor and a low sulfite concentration [45]. However, N 2 as the final product of Fe(II)EDTA-NO reduction was recognized by most researchers [7][8][9][10][11]13,20,35,37,38,[45][46][47].…”

“…The Fe(II)EDTA-NO solution was added into the reactor with the influent through a peristaltic pump. The preparation of Fe(III)EDTA solution referred to the original method where the concentrations were 4-6 mM [20].…”

Evaluation of FeIIEDTA‐NO reduction by thiourea dioxide in NO removal with FeIIEDTA

“…Zhang et al 28 and Li et al 29 studied the color change during reducing Fe II EDTA-NO, finding that the color of the Fe II EDTA-NO solution changed from black-brown Fe II EDTA-NO to colorless Fe II EDTA. Zhang et al 28 and Li et al 29 studied the color change during reducing Fe II EDTA-NO, finding that the color of the Fe II EDTA-NO solution changed from black-brown Fe II EDTA-NO to colorless Fe II EDTA.…”

“…Meanwhile, the Fe II EDTA-NO color change during the reduction process has a significant instruction. Zhang et al 28 and Li et al 29 studied the color change during reducing Fe II EDTA-NO, finding that the color of the Fe II EDTA-NO solution changed from black-brown Fe II EDTA-NO to colorless Fe II EDTA. In this research, it can be observed from Figure 3 that the color was changed from black-brown color into colorless after reduction by TD, and when the NO and N 2 mixture was imported into the colorless solution, the black-brown color was restored.…”