Table 2.
Key properties of WWTPs sampled.
| Acronym | WWTP | Treatment process | Design capacitya PEdesign [–] |
Nominal number of connected residentsb PEnom [–] |
Annual wastewater flow in 2019a [m3/a] | Actual wastewater flow on April 8th, 2020b Qactual [m3/day] |
Sample ID and sampling location on April 8th, 2020 | |
|---|---|---|---|---|---|---|---|---|
| KLEM | Kläranlage Emscher-mündungc | AS | 2,400,000 | 2,228,933 | 347,602,053 | 1,159,488 | P1 | Inflow |
| P2 | Effluent | |||||||
| DU | Duisburg-Kaßlerfeld | AS | 450,000 | 257,262 | 33,028,604 | 82,957 | P3 | Inflow |
| E | Essen-Süd | AS | 135,000 | 119,226 | 12,543,902 | 29,695 | P4 | Inflow |
| MO | Moers-Gerdt | AS | 250,000 | 118,018 | 8,626,863 | 25,299 | P5 | Inflow |
| MG | Mönchenglad-bach-Neuwerk | AS | 632,500 | 494,077 | 33,382,628 | 85,131 | P6 | Inflow |
| EUS | Euskirchen-Kessenich | AS | 132,000 | 69,496 | 8,213,543 | 20,285 | P7 | Inflow |
| ERFT | Bergheim-Kenten | AS | 120,000 | 98,898 | 7,331,398 | 13,432 | P8 | Inflow |
| DN | Düren | AS | 310,000 | 134,723 | 20,104,329 | 54,253 | P9 | Inflow |
| P10 | Effluent | |||||||
| AC | Aachen-Soers | AS followed by full-scale ozonation and filtration | 458,000 | 205,000 | 25,057,198 | 66,052 | P11 | Inflow |
| P12 | After tertiary treatment | |||||||
| P13 | Effluent after ozonation and filtration | |||||||
AS: activated sludge treatment, PE: population equivalent.
a
Data from ELWAS (2020).
b
Data provided by operator.
c
WWTP KLEM treats the complete flow of river Emscher. PEnom refers to the complete upstream catchment area, including PEnom of all upstream WWTPs discharging into river Emscher.