Table 1.
Substrate concentrations in influent and effluent of the bioreactor
| Period | Time (day) | Influent (mM) | Effluent (μM)a | ||
|---|---|---|---|---|---|
| Ammonium | Nitrite | Ammonium | Nitrite | ||
| Anaerobic precultivation | 5–33 | 10 | 10 | 1712 | 1 |
| 34–58 | 10 | 11 | 1388 | 2 | |
| 59–72 | 10 | 12.5 | 484 | 1 | |
| Oxygen-limited operation with high (∼ 300 μM) residual ammonium | 73–85b | 10 | 12.5 | 0 | 340 |
| 86–139 | 10.5 | 12.5 | 305 | 6 | |
| Oxygen-limited operation with low (∼ 30 μM) residual ammonium | 140–370 | 11 | 12.5 | 35 | 40 |
a
The values of ammonium and nitrite concentrations are average concentrations in the effluent during each time period.
b
Period of unstable reactor operation.