TABLE 1.
Operating data for three reactorsa
| Reactor | Period | Days | HRT (d) | OLR (mmol C L−1 d−1) |
Gas flow rate (L d−1) |
Sparged with |
|---|---|---|---|---|---|---|
| R1 | 1 | 75 to 142 | 8.9 ± 0.3 | 1.4 × 102 ± 7.9 | 0 | No gas |
| 2 | 143 to 184 | 9.6 ± 0.3 | 1.2 × 102 ± 6.7 | 3.38 ± 4.86 | N2 off/on | |
| 3 | 185 to 234 | 9.0 ± 0.3 | 1.4 × 102 ± 6.5 | 24.7 ± 13.7 | N2 | |
| R2 | 1 | 75 to 142 | 8.9 ± 0.5 | 1.4 × 102 ± 8.4 | 0 | No gas |
| 2 | 143 to 184 | 9.0 ± 0.2 | 1.3 × 102 ± 8.8 | 2.45 ± 3.53 | N2 and H2 off/on | |
| 3 | 185 to 234 | 8.9 ± 0.3 | 1.4 × 102 ± 8.2 | 6.14 ± 7.00 | N2, H2 | |
| R3 | 1 | 75 to 142 | 7.8 ± 0.3 | 1.6 × 102 ± 7.6 | 0.50 ± 0.31 | No gas |
| 2 | 143 to 184 | 8.4 ± 0.5 | 1.3 × 102 ± 13 | 5.02 ± 5.64 | N2 off/on | |
| 3 | 185 to 234 | 7.0 ± 0.6 | 1.8 × 102 ± 15 | 10.2 ± 4.83 | N2 |
a
We report the hydraulic retention time (HRT), organic loading rate (OLR), and gas flow rate for each reactor and each period. The gas flow rate was measured at the outlet of each reactor system. Different gases were utilized as indicated. During Period 2, gas sparging was periodically on and off to the reactors, whereas it was on all the time during Period 3. Mean ± s.e. is reported. R1–3 are Reactors 1–3.