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Mechanistic insights into collaborative removal of NO and chromium from flue gas in denitrifying biotrickling filter by Huiying Wang; Zhuoyao Chen; Haixu Liu; Yunyan Liu; Zaishan Wei is a Environmental Science article available to read on EtoBox.

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Nitrogen oxides (NO x ) and chromium can cause harm to human health and ecological environment. An aerobic denitrifying biotrickling filter (DBTF) for simultaneous removal of NO x and chromium from flue gas was investigated. NO x and chromium removal efficiency could reach up to 98 % and 88 %, respectively. Halomonas, Stappia, Pseudomonas and UG_Peptococcaceae were the core chromium-resistance- denitrifying genus. Anti-oxidative stress proteins (RpoS, SOD, OxyR and catalase) and anti-heavy metal proteins (MntA, FbpA, TorB and ChrE etc.) and the denitrifying enzymes (NarH, NarI, NapA, NapB, NirK, NirS and NorB) involved in the regulation of chromium stress and the reduction of NO x , as shown by 16 S rDNA, metagenomic and metaproteomic sequencing. The biofilm was characterized by FTIR, XPS, EEM, and SEM-EDS. XPS spectra indicated the formation of a chromium carbonate by microbial induced carbonate precipitation. Chromium speciation in biofilm mainly consisted of 52.8 % organic matter bound state, 35.1 % carbonate bound state and 10.7 % exchangeable state. Flue gas chromium could be removed in the form of chromium carbonate bioprecipitate and HA-Cr via complexation of humic acids in

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Author

Huiying Wang; Zhuoyao Chen; Haixu Liu; Yunyan Liu; Zaishan Wei

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)