Table 2.
NH4+-N, NO2−-N, and TN removal efficiency and biofilm mass of denitrifying MBBR at different FRs.
| FR(%) | NH4+-N (mg/L) | NO2-N (mg/L) | TN (mg/L) | Biofilm mass (mg/g-carriers) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Influent | Effluent | Removal rate (%) | Influent | Effluent | Removal rate (%) | Influent | Effluent | Removal rate (%) | ||
| 20 | 0.7 ± 0.2 | 0.5 ± 0.3 | 27.9 ± 39.1 | 0.6 ± 0.2 | 0.8 ± 0.5 | −21.1 ± 61.9 | 8.7 ± 5.2 | 2.6 ± 3.2 | 74.5 ± 16.0 | 4.86 |
| 30 | 1.4 ± 0.5 | 0.8 ± 0.4 | 38.5 ± 28.0 | 0.8 ± 0.4 | 0.9 ± 0.4 | −29.6 ± 65.7 | 11.0 ± 3.0 | 6.2 ± 2.2 | 42.1 ± 16.2 | 3.29 |
| 40 | 1.4 ± 0.5 | 0.9 ± 0.5 | 35.0 ± 31.9 | 0.8 ± 0.4 | 1.0 ± 0.6 | −27.3 ± 54.6 | 11.0 ± 3.0 | 6.2 ± 2.6 | 42.8 ± 20.0 | 2.51 |
| 50 | 0.9 ± 0.6 | 0.6 ± 0.2 | 19.4 ± 39.6 | 0.7 ± 0.2 | 0.7 ± 0.3 | −4.9 ± 26.7 | 8.9 ± 4.8 | 1.9 ± 2.0 | 80.4 ± 11.4 | 2.17 |