The VOG wastewater treatment plant is the first in the Canton of Fribourg able to eliminate micropollutants. The chosen process adds doses of powdered activated carbon (PAC) directly to the sand filters. The PAC separation is performed by five two-layer sand filter cells. This fourth stage was commissioned in July 2023. Tests show that the system is reliable and delivers very high purification performance.
Our tasks
HOLINGER was the general planner from the planning to the realization of the expansion:
- Expansion from 22,000 to 48,000 PE.
- New biology
- Treatment of micropollutants with PAHs and double-layer sand filtration
- Renovation of the digestion towers, new gasometer
- Treatment and feed-in of biogas
- Heat recovery from the treated wastewater using heat pumps
- New rainwater basin
