France – Sewerage work – Sécurisation du fonctionnement hydraulique de la station de pompage VL2 à Villeneuve Saint Georges

The reliability of the interdepartmental pumping station VL2 located in Villeneuve Saint Georges, owned by the Syndicat Interdépartemental pour l'Assainissement de l'Agglomération Parisienne and operated by the Val de Marne departmental council (Direction des Services de l'Environnement et de l'Assainissement). The VL2 pumping station was built in 1991 to supply the STEP of Valenton (Seine amont - SAM) with effluents collected in the Val de Marne and to relieve Seine aval. The present project aims to implement the results of the hydraulic reliability study and the AMDEC carried out from 2016 to 2018 for all that was noted as unacceptable criticality of degree 1, namely: - Modification of pumping to ensure continuous compliance with the flow rates of the STEP regardless of pump failure occurrences, - Securing the discharge tank, - Partitioning of the TGBT and transformers, - Modification of the screening system to evacuate the grindings, - Replacement of the post inlet valves. The objectives are threefold: - On the one hand, to ensure the availability and backup of the VL2 pumping in line with the purification objectives of SAM (flow rate of 6m3/s) and thus reduce the routing to SESAME and Charenton - On the other hand, to make the equipment of the VL2 station reliable, the analysis of the failure modes (AMDEC) of which has highlighted an unacceptable criticality, - Finally, to improve the quality of the effluent pumped to the Valenton plant by eliminating the screening refusals at the source (shared desire in the SIAAP area to reduce the silting of the pre-treatment and thus improve the efficiency of the wastewater treatment plant).