Performance and kinetics of rotating drum biofilter aerobic simultaneous purifying SO and NO.

The rotating drum biofilter (RDB) was investigated as a biological process for purifying SO and NO. After 25 days of film hanging, the inlet concentration was less than 2800 mg·m, and the NO inlet concentration was less than 800 mg·m, with greater than 90% desulphurisation and denitration efficiency. and were the dominant bacteria in desulphurisation, while were the dominant bacteria in denitrification. The sulphur and nitrogen in RDB were balanced when the SO inlet concentration was 1200 mg·m and the NO inlet concentration was 1000 mg·m. The best results were obtained SO-S removal load was 28.12 mg·L·h and NO-N removal load was 9.78 mg·L·h. when SO concentration was 1200 mg·m, NO concentration was 800 mg·m, and empty bed retention time (EBRT) was 75.36 s. The liquid phase dominated the SO purification process, and the experimental data fit better with the liquid phase mass transfer model. NO purification was governed by the biological and liquid phases, with the modified biological-liquid phase mass transfer model fitting the experimental data better.