Table 1.
Organic loading rate (gVS L−1 day−1) of reactor ROLR and urea dosage (g d−1) of reactor RUREA. The OLR of RUREA was constant at 3.2 g VS L−1 d−1 from day 20. The urea dose was regulated according to the resulting FAN concentration in ROLR, and thus the dosage varied somewhat throughout the operation
| Days | OLR (g VS L−1 day−1) | Urea dose (g day−1) |
|---|---|---|
| 0–20 | Increase from 2.3 to 3.2 | – |
| 21–99 | 3.2 | – |
| 100–134 | 3.4 | 0.11 |
| 135–178 | 3.7 | 0.24 |
| 179–208 | 3.9 | 0.37 |
| 209–251 | 4.2 | 0.61–1.2 |
| 252–314 | 3.9 | 0.48–0.70 |
| 315–442 | 4.2 | 0.83 |
| 443–495 | 4.8 | 1.2–1.7 |
| 496–539 | 5.3 | 1.6–2.3 |
| 540– | 6.0 | 2.0–3.6 |