Achères « Seine Aval » Waste Water Treatment Plant : Rebuilding of the inlet and distribution structure
Client: Hydratec - Model scale: 1:12
Exceptional scale model with unusual large dimensions and numerous electronical equipement (measurement instrumentation and automatized control).
Context
The joint venture OTV / STEREAU / HYDRATEC / ARTELIA was commisioned by SIAAP for a « design and build » for the rebuilding of the biggest treatment plant in Europe, « Seine Aval » in Achères, west of Paris. The aim is to introduce a new primary decantation step with lift station between pretreatment and biological treatment. HYDRATEC subcontracted ARTELIA for a hydraulic physical model study, from the outlet of the pretreatment to the 4 pumping stations, in order to confirm/optimize the hydraulic design and to ensure proper and safe operation.
Description of the physical scale model Scale model of the inlet and distribution structures
Large number of measuring devices : 11 electromagnetic flowmeters, 22 level sensors, gates position monitoring
New control-command system : motorized gates and electronical monitoring
Spatial and temporal monitoring of the disjunction wave, in case of partial / general electrical shutdown
Aims of the physical scale model
Improvement of the hydraulic operation : headlosses, surface vortices, prerotation at the pump suction, transition between existing structures and project structures.
Operation of the emergency weirs (by-pass)
Study of the transient phenomena and surge analysis (in case of pumping station electrical disjunction)
