Citation: | XU M D,WANG J F,GE J L,et al.Research advances of bioprocesses for NOx removal from flue gas: a critical review[J].Journal of Environmental Engineering Technology,2022,12(6):2049-2056 doi: 10.12153/j.issn.1674-991X.20210457 |
Nitrogen oxides (NOx), the precursors of PM2.5 and O3, are important air pollution control indices. Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are mature technologies for NOx removal from coal-fired industrial boiler flue gas. However, the application of the two technologies in small-and-medium denitrification engineering is limited because of their high investment costs, harsh operating conditions and other factors. In recent years, biological denitrification technologies have been used increasingly in small-and-medium flue-gas denitration projects. Many scholars have carried out extensive research on them. The advances of bioprocesses for NOx removal from flue gas were critically reviewed, and the denitrification principles and technical characteristics of related processes were summarized. The latest research directions of chemical absorption-biological denitrification (BioDeNOx) were reviewed, and the operational principles, reduction mechanism, reactor developments, operational parameters and influencing factors of complexation absorption-biological reduction (CABR) were emphatically elucidated. The obstacles of the CABR system and its solutions were systematically discussed, and the future trends of bioprocesses for NOx removal were prospected.
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