Catchment Area
| Compilation if the keeping threshold values |
| Parameter |
EU-guidelines |
Dimensioning of the plant |
| CSB |
125 |
75 |
| BSB5 |
25 |
15 |
| Nges |
10 |
10 |
| Pges |
1 |
1 |
| GUS |
35 |
30 |
ARA Tobl serves 14 communities in the Puster Valley and has a catchment area of 900 km2.
These communities make up 10% of the total area of South Tyrol. During the initial operation in 1996, the Central Puster Valley associated wastewater treatment plant clarified the wastewater of the following communities: St. Lorenzen, Bruneck, Percha, parts of Olang and Rasen-Antholz.
In 1997, Sand in Taufers, the community Ahrntal to Steinhaus and the remaining part of Rasen-Antholz followed. In 1998, Prettau und Mühlwald joined the association. In 2000 where connected the communities of St. Vigil, Wengen and St. Martin.
Dimensioning Principles
| Population Data |
| Hydraulic load: 95.000 inhabitants and population equivalent respectively |
| Specific sewage flow rate per head: |
300 l/Day |
| Dry weather flow QDWF: |
570 l/s |
| Wet weather flow QWWF: |
1.140 l/s |
| Daily quantity of sewage |
28.500 m3/day |
| Biological Load: 130.000 inhabitants and population equivalent respectively |
BOD5 - loads:
Specific load value: |
60 g/E day 7.800 kg/day |
COD - load:
Specific load value: |
110 g/E day 14.300 kg/day |
NKj -loads:
Specific load value: |
12 g/E day 1.560 kg/day |
NH4-N -loads
Daily loads: |
910 kg/day |
NO3-N -loads
Daily loads: |
60 kg/day |
Ntotal -loads
Daily loads: |
1.620 kg/day |
Phosphor P - loads
Daily loads: |
3 g/day 390 kg/day |