a 36 million euro site for wastewater


In order to protect the Jalle de Blanquefort from wastewater, a pipeline will link Eysines and Blanquefort. Two years of work for a 36 million euros project financed by Bordeaux Métropole

Bordeaux Métropole is continuing its major works program, notably with the creation of a link between the treatment plants of Cantinolle, in Eysines, and Lille, in Blanquefort. For this, major work was undertaken this summer to lay new conduits allowing the transfer of wastewater collected from the Eysines Cantinolle treatment plant to the Lille one located in Blanquefort.

The objective of this project is twofold: on the one hand, to eliminate the discharge into the Jalle de Blanquefort of treated water from the Cantinolle wastewater treatment plant, by transferring it to the Garonne via the Lille wastewater treatment plant, and thus to better protect the Jalle, a sensitive natural environment; on the other hand, to increase Cantinolle’s processing capacity, in line with the increase in the population in this sector of the metropolis.

A microtunnel machine put into service

This week, the site is entering a new phase with the commissioning of the microtunneler. In fact, two parallel pipes, one for the wastewater already treated by the Cantinolle treatment plant and one for the wastewater to be treated, are being laid over 9 km, of which 7.6 km in trenches and 1, 4 km by microtunnelier.

Two sections are affected by the microtunnelier in Blanquefort: near rue du Déhez (passage under the railway tracks) and at avenue du Port du Roy. The works are scheduled in order to limit the impact on traffic as much as possible by favoring the installation of networks under the shoulders.

However, certain phases of the work will require the establishment of a one-way street on Avenue du Port-du-Roy (underway then between October 2021 and March 2022), as well as the closure of Avenue du 11 novembre, from June to September 2021. A detour will provide service to the Blanquefort industrial zone.

The site will require a total of two years of work, for 36 million euros including tax of investments on the part of Bordeaux Métropole. When the new system is put in place, 3,050 cubic meters per hour of treated water will be transferred to the Garonne.

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