Performance of NO removal using Fe(Ⅱ)EDTA complexing absorption coupled with H2-MBfR
An integrated system of Fe(Ⅱ)EDTA complexing absorption coupled with H2-based membrane biofilm reactor(H2-MBfR)was constructed and a mixed bacterial strain capable of simultaneous denitrification and iron reduction was domesticated.Based on the maintenance of the stable denitrification of the reduction system,the effects of Fe(Ⅱ)EDTA concentration and pH on NO removal efficiency were investigated and the microbial community structure was analyzed.The results showed that the Fe(Ⅱ)EDTA complexing absorption coupled with H2-MBfR reduction integrated system had a stable NO removal efficiency,and the maximum removal efficiency was 99.50%.Elevating the initial Fe(Ⅱ)EDTA concentration facilitated the formation of Fe(Ⅱ)EDTA-NO,subsequently enhancing average NO removals in the system.The maximum removal rate of 44.68mg/(m3·h)was achieved at a Fe(Ⅱ)EDTA concentration of 10mmol/L.Increasing the pH hindered the accumulation of Fe(Ⅱ)EDTA-NO,and maintaining a pH of 6proved more suitable for optimal operation of the integration system.The microbial community structure analysis revealed that the dominant phylum in the integration stage were Proteobacteria,Bacteroidetes and Firmicutes,played important roles in this system,with abundance of 50.35%,16.43%and 14.98%,respectively.
hydrogen-based membrane biofilm reactor(H2-MBfR)flue gas denitrificationcomplexing absorptioninfluencing factors
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