Table 1. Characteristics and operational conditions of bioreactors sampled in the study.
| WWTP | Code | Country | Technology | HRT (h) | SRT (d) | BODinf (mg/L) | BODeff (mg/L) | TNinf (mg-N/L) | TNeff (mg-N/L) | MLSS (g/L) | TPinf (mg-P/L) | TPeff (mg-P/L) | Dissolved Oxygen (mg-O/L) | Temperature (°C) | pH |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Amsterdam West | 1 | The Netherlands | CAS | 17 | - | 262 | < 5 | 53 | 10 | 5 | 9 | 1 | 1.5 | 20 | 7.2 |
| Harnaschpolder | 2 | The Netherlands | CAS | 27 | 25 | 343 | < 5 | 33 | 1.5 | 4 | 6.7 | <1 | 1.5 | 19 | – |
| Houtrust | 3 | The Netherlands | CAS | 15 | 14 | 350 | < 5 | 46.8 | 8.4 | 4,2 | 8.1 | 1.1 | 1 | 16.2 | – |
| Vianen | 4 | The Netherlands | CAS | 35 | 27 | 212 | 2.2 | 47 | 3.4 | 4 | 6.5 | 1.3 | 1 | 15 | 7.0 |
| Granada | 5 | Spain | CAS | 23 | – | 449 | 20 | 75 | 9 | 3.7 | 16 | 1 | 2.5 | 22 | 7.5 |
| Kralingseveer | 6 | The Netherlands | CAS | 16 | 20 | 107 | < 5 | 43 | 5.3 | 3.8 | 6 | 1.3 | 1.5 | 18.1 | 7.3 |
| Kortenoord | 7 | The Netherlands | CAS | 20 | 20 | 220 | < 5 | 56 | 2.6 | – | 10 | 0.3 | 1.5 | 18.8 | – |
| Dokhaven | 8 | The Netherlands | A-stage | 0.7 | 0.27 | 170 | < 5 | 44 | 12 | – | 6 | 1 | 1 | 18 | 7 |
| Breda | 9 | The Netherlands | A-stage | 0.41 | 0.60 | 207 | < 5 | 47 | 24 | 2.5 | 6 | 3.4 | 0.2 | 18 | 7 |
| Utrecht | 10 | The Netherlands | A-stage | 0.89 | 0.42 | 157 | < 5 | 45 | 10 | – | 7.6 | - | 0.2 | 18 | 7 |
All CAS plants have a presettling tank except Vianen and Kortenoord.