The €776.7 million contract was awarded by SIAAP, the wastewater authority for the Greater Paris area.
 
OTV will lead the project and coordinate all the participants in the Biosav consortium (architects, design firms, civil engineering and wastewater treatment process companies). OTV will also design and build the structures and supply the treatment process.
 
The project involves rebuilding a new, more efficient biological treatment train as part of the total renovation of the site. OTV and the Biosav partners will extend the existing biofiltration structures (BIOSTYR process) and construct a new membrane filtration treatment train.
 
Commissioning of the new facilities is planned for the end of 2017.
 
Seine Aval is the largest wastewater treatment plant in Europe.