Table 1.
Operational conditions of the two treatment systems (CAS and AGS) at the Vroomshoop and Garmerwolde WWTPs during the sampling campaign - December 2017 to May 2018.
| Parameters | Vroomshoop |
Garmerwolde |
||
|---|---|---|---|---|
| CAS | AGS | CAS | AGS | |
| Average Dry flow (ADF) (m3/d) | 2140 | 1541 | 27,645 | 20,355 |
| Average peak flow (m3/h) | 1125 | 140 | 7148 | 4200 |
| Population equivalent COD based | 13,100 | 9500 | 210,000 | 140,000 |
| Organic loading rate (kg COD/m3/d) (aerated) | 0.50 | 0.65 | 0.53 | 0.50 |
| Mixed liquor suspended solids range (g/m3) | 3–6 | 9–14 | 5–8 | 10–14 |
| Aerated basin, O2 (g/m3) | 0.3–1.8 | 1.5–2.8 | 1.0–2.0 | 0.2–2.4 |
| Water temperature (◦C) range | 8.5–17.8 | 8.5–17.8 | 8.6–18.0 | 8.6–8.0 |
| Hydraulic retention time (HRT) at ADF(h) | 27 | 11–24 | 24 | 10–12 |
| Sludge retention time (d) | 27 | >21 | 23 | >30 |