1. The plant will be located behind the sewage treatment plant.
The creation of the anaerobic digestion plant is located behind the current wastewater treatment plant, located between Dijon and Longvic. The site will be carried out by Odivea, owned by the Suez group at 51% and by the metropolis of Dijon at 49%. Twelve companies will be mobilized on this site, including seven local. The end is scheduled for 2023. Odivaa has been in charge, since its creation in April 2021, of the production and distribution of drinking water as well as the treatment of wastewater in several municipalities in the metropolis (1).
2. The ambition to “achieve positive energy”
The sludge is extracted from the purification basins and is then methanized. This process results in the transformation of biogas into biomethane. This will be injected directly into the GRDF gas distribution network. The remaining sludge will be used for composting. The ambition is to “achieve zero waste and even positive energy, by producing more energy than that consumed. This is a first in France ”.
3. The equivalent of the consumption of 4000 homes per year
Energy production that aims to be ecological: The methanization of sludge from the treatment plant will produce 10 GWh / year, ie the equivalent of the consumption of around 4,000 homes. Thanks to this anaerobic digestion, the objective is to reduce the volume of this sludge by 40%, thus making it possible to reduce the pollution generated by their transport (passage from 900 to 480 trucks).
4. A significant cost of 15 M €
The project to build the anaerobic digestion plant represents a cost of 15 million euros, financed to the tune of 9.5 million by Odivea and 5.5 million euros in aid by the State with the France plan.
5. The first site in a long series
Three other projects will follow that on the methanization of sludge, including the thermal recovery of sludge, the extension of the storm basin and the treatment of micropollutants. In total, 100 million euros will be invested by 2030 to finance them. The breakdown is 40% for the production and distribution of drinking water (network renewal, fight against leaks, etc.) and 60% for wastewater treatment (construction of the anaerobic digestion plant, construction of a new storm basin, thermal recovery of sludge by incineration and treatment of plastic micropollutants).
This is the cost represented by the project to build the anaerobic digestion plant financed to the tune of € 9.5 million by Odivea and € 5.5 million in aid by the State.