Published on 23.01.2012
The new wastewater treatment unit in Arenthon (Upper Savoy, France) was opened on Saturday, October 22, 2011. In 2005, reconstruction work was begun to replace the wastewater treatment plant’s former facilities, which were at capacity and could no longer meet water treatment standards. Today, the new plant has a treatment capacity of 90,000 RE and can treat urban wastewater from 8 municipalities, representing an annual total of 1,500,000 m3. BG, in association with Jean-Philippe Besson Architectures and IRAP, has acted as the prime contractor for this project.
The treatment plant was built on the same site as the existing Arenthon facility, which meant that the work done by the Degrémont-Pugnat-Degrémont Services group and subcontractor Mauro, begun in October 2008, was subject to significant scheduling constraints. Construction of the operations building and renovation of the existing digester could not begin until new facilities had been brought on line and existing ones demolished. Wastewater treatment services were provided continuously during the entire project.
The treatment plant construction requested during peak activity 90 people on site, 16,000 m3 of preloading material to stabilise the ground, 26,000 m3 of excavation, 8,000 m3 or nearly 20,000 metric tons of concrete, 620 metric tons of stainless steel pipes and collectors, 20 km of electrical cable and 2,000 entrances and leads allowing for 160 motor outlets.
Wastewater treatment in the new plant is divided into three distinct pathways:
A water treatment pathway, consisting of
A sludge treatment pathway, consisting of
A pathway to treat contaminated air, consisting of two lines of three physical and chemical deodorising towers.
To enhance the reliability of the facility, each treatment pathway consists of two identical treatment lines operating in parallel.