The Isle of Olonne has a wastewater treatment plant witha treatment capacity of 6,500 PE. The new treatment system includes the following structures:
- A discharge pipe from the old to the new wastewater treatment plant;
- Screening, compacting and bagging of rejects;
- A 250 m³ storage tank with a pump to return it to the water line;
- An aeration tank containing: a contact zone, an anaerobic zone, an aeration channel (phase syncopation), physico-chemical phosphorus precipitation.
- A deaerator ;
- A clarifier ;
- UV disinfection ;
- A recirculation sludge pit ;
- A discharge station for treated water with
metering; - A discharge pipe for around 900 m of
treated water into the Vertonne river; - Reuse of existing lagoons in the event of
overflow; - Sludge dewatering using a screw press;
- Storage of sludge in skips;
- Deodorisation using activated carbon.