Table 1 Summarized information for the studied WWTPs (as of 2022)
WWTP | Measured inlet loada | Generated sludge | Primary clarifyers | Nitrogen (N) removal | Phosphorus (P) removal | Sludge stabilization | Dewatering | Current sludge utilization |
|---|---|---|---|---|---|---|---|---|
p.e | t DW/year | |||||||
WWTP1 | 10 332 | 95 | no | DN | FeCl3 | AS | centrifuge | no data |
WWTP2 | 109 694 | 1263 | yes | DN | FeCl3 + Bio | MT | belt press | agriculture |
WWTP3 | 142 980 | 526 | yes | DN | FeCl3 | OD | centrifuge | recultivation |
WWTP4 | 75 939 | no data | yes | DN | not needed | EA and OD | drying beds | kept on site |
WWTP5 | 962 682 | 16,005 | yes | DN | FeCl3 + Bio | MT | belt press | agriculture |
WWTP6 | 28 308 | 153 | yes | DN | FeCl3 + Bio | AS | belt press | agriculture |
WWTP7 | 34 340 | 203 | yes | DN | FeCl3 | AS | centrifuge | kept on site |
WWTP8 | 36 634 | 183 | yes | DN | FeCl3 | MT | auger press | kept on site |