Performance and kinetics of rotating drum biofilter aerobic simultaneous purifying SO2 and NOx.

The rotating drum biofilter (RDB) was investigated as a biological process for purifying SO₂ and NO_x. After 25 days of film hanging, the inlet concentration was less than 2800 mg·m⁻³, and the NO_x inlet concentration was less than 800 mg·m⁻³, with greater than 90% desulphurisation and denitration efficiency. Bacteroidetes and Chloroflexi were the dominant bacteria in desulphurisation, while Proteobacteria were the dominant bacteria in denitrification. The sulphur and nitrogen in RDB were balanced when the SO₂ inlet concentration was 1200 mg·m⁻³ and the NO_x inlet concentration was 1000 mg·m⁻³. The best results were obtained SO₂-S removal load was 28.12 mg·L⁻¹·h⁻¹ and NO_x-N removal load was 9.78 mg·L⁻¹·h⁻¹. when SO₂ concentration was 1200 mg·m⁻³, NO_x concentration was 800 mg·m⁻³, and empty bed retention time (EBRT) was 75.36 s. The liquid phase dominated the SO₂ purification process, and the experimental data fit better with the liquid phase mass transfer model. NO_x purification was governed by the biological and liquid phases, with the modified biological-liquid phase mass transfer model fitting the experimental data better. [ABSTRACT FROM AUTHOR]