Table 3.
Short-term stress test set-up
| Stressor | Day 1 | Day 2 | Day 3 | Day 4 |
|---|---|---|---|---|
| Control | – | – | – | – |
| Ammonium (mg TAN l−1) | 1000 | 2000 | 4000 | 6000 |
| Sulfate (mg l−1) | 500 | 1000 | 2000 | 4000 |
| High OLR (g COD l−1 day−1)a | 2 | 4 | 6 | 8 |
| Acidification with HCl (mmol l−1) | 2 | 6 | 12 | 18 |
| Acidification with HCl (final pH) | 7.27 ± 0.05 | 6.97 ± 0.06 | 6.72 ± 0.04 | 6.44 ± 0.02 |
a
In every treatment, the OLR was 1 g COD l−1 day−1, except for the high organic loading rate treatment in which the OLR was raised every day, as presented in the table.
The values presented for ammonium, sulfate and acidification are final concentrations in the reactor (n = 3).