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Fe(II)EDTA-NO reduction by a newly isolated thermophilic Anoxybacillus sp. HA from a rotating drum biofilter for NOx removal. | LitMetric
The reduction of Fe(II)EDTA-NO is one of the core processes in BioDeNOx, an integrated physicochemical and biological technique for NOx removal from industrial flue gases. A newly isolated thermophilic Anoxybacillus sp. HA, identified by 16S rRNA sequence analysis, could simultaneously reduce Fe(II)EDTA-NO and Fe(III)EDTA. A maximum NO removal efficiency of 98.7% was achieved when 3mM Fe(II)EDTA-NO was used in the nutrient solution at 55°C. Results of this study strongly indicated that the biological oxidation of Fe(II)EDTA played an important role in the formation of Fe(III)EDTA in the anaerobic system. Fe(II)EDTA-NO was more competitive than Fe(III)EDTA as an electron acceptor, and the presence of Fe(III)EDTA slightly affected the reduction rate of Fe(II)EDTA-NO. At 55°C, the maximum microbial specific growth rate μmax reached the peak value of 0.022h(-1). The maximum NO removal efficiency was also measured (95.4%) under this temperature. Anoxybacillus sp. HA, which grew well at 50°C-60°C, is a potential microbial resource for Fe(II)EDTA-NO reduction at thermophilic temperatures.
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