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Effect of Oxygen Content on NO Removal and Microbial Communities of a Hybrid Catalytic Membrane Biofilm Reactor

Abstract

The effect of oxygen content on NO removal and microbial communities of a hybrid catalytic membrane biofilm reactor (HCMBR) has been investigated. NO removal efficiency reached 84.8%, 85.1%, 94% and 94.5% at oxygen content of 2%, 6%, 10% and 17% in flue gas (H₂, H₆, H₁₀ and H₁₇), respectively. NO removal increased with increasing oxygen content.

Denitrification was dominant in H₂, H₆; simultaneous nitrification and denitrification occurred in H₁₀, H₁₇. Oxygen content influenced the microbial community in HCMBR as shown by 16S rDNA, metagenomics sequencing method. The dominant phylum was Fluviicola, Arcobacter, Brachymonasin H₂, H₆, H₁₀, while Brachymonas, denitrificans, vadinCA02 in H₁₇. Fluviicola, Acrobacter, Brachymonas and Brachymonas were dominant denitrifiers in H₂, H₆, H₁₀ and H₁₇, respectively. Primary coordinate analysis (PcoA) indicated phylogenic structures in H₁₀ and H₁₇ were highly alike but dissimilar to those in H₂ and H₆. Canonical correlation analysis (CCA) classified visualized oxygen content dependence distinction of bacterial genera.

Z.S. Wei, J.L. Pei, Z.S. Huang, X.L. Xiao, M.R. Tang, B.L Li, X. Zhang

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