NH4-N and NO3-N minimum residual concentration following initial start-up period and prior to breakthrough (±Std error)
| HRT (h) . | Influent NH4-N (mg·L−1) . | Min. effluent NH4-N (mg·L−1) . | Influent NO3-N (mg·L−1) . | Min. effluent NO3-N (mg·L−1) . |
|---|---|---|---|---|
| Site A | ||||
| 3 | 5.52 (0.02) | 3.30 (0.00) | 21.50 (0.20) | 12.8 (0.00) |
| 6 | 5.60 (0.40) | <0.001* | 18.75 (0.35) | 2.35 (0.15) |
| 12 | 3.89 (0.01) | <0.001* | 21.55 (0.25) | 1.00 (0.00) |
| 20 | 2.95 (0.05) | <0.001* | 19.85 (0.05) | 0.30 (0.00) |
| Site B | ||||
| 3 | 0.20 (0.02) | <0.001* | 40.90 (0.70) | 19.3 (0.10) |
| 6 | 0.51 (0.00) | <0.001* | 21.00 (0.00) | 1.00 (0.00) |
| 12 | 0.52 (0.02) | <0.001* | 27.50 (0.30) | 1.55 (0.05) |
| 20 | 0.33 (0.01) | <0.001* | 33.65 (0.35) | 0.40 (0.10) |
| Site C | ||||
| 3 | 2.61 (0.09) | <0.001* | 1.90 (0.10) | nd |
| 6 | 2.28 (0.40) | <0.001* | 1.35 (0.05) | nd |
| 12 | 2.75 (0.00) | <0.001* | nd | nd |
| 20 | 2.60 (0.13) | <0.001* | 3.30 (0.10) | 0.4 (0.00) |
| HRT (h) . | Influent NH4-N (mg·L−1) . | Min. effluent NH4-N (mg·L−1) . | Influent NO3-N (mg·L−1) . | Min. effluent NO3-N (mg·L−1) . |
|---|---|---|---|---|
| Site A | ||||
| 3 | 5.52 (0.02) | 3.30 (0.00) | 21.50 (0.20) | 12.8 (0.00) |
| 6 | 5.60 (0.40) | <0.001* | 18.75 (0.35) | 2.35 (0.15) |
| 12 | 3.89 (0.01) | <0.001* | 21.55 (0.25) | 1.00 (0.00) |
| 20 | 2.95 (0.05) | <0.001* | 19.85 (0.05) | 0.30 (0.00) |
| Site B | ||||
| 3 | 0.20 (0.02) | <0.001* | 40.90 (0.70) | 19.3 (0.10) |
| 6 | 0.51 (0.00) | <0.001* | 21.00 (0.00) | 1.00 (0.00) |
| 12 | 0.52 (0.02) | <0.001* | 27.50 (0.30) | 1.55 (0.05) |
| 20 | 0.33 (0.01) | <0.001* | 33.65 (0.35) | 0.40 (0.10) |
| Site C | ||||
| 3 | 2.61 (0.09) | <0.001* | 1.90 (0.10) | nd |
| 6 | 2.28 (0.40) | <0.001* | 1.35 (0.05) | nd |
| 12 | 2.75 (0.00) | <0.001* | nd | nd |
| 20 | 2.60 (0.13) | <0.001* | 3.30 (0.10) | 0.4 (0.00) |
nd = not determined, * = below limit of detection.