Redesign of Clichy wastewater treatment plant

Redesign of Clichy wastewater treatment plant
Context & Issues

The Clichy plant is a key wastewater treatment facility in the Greater Paris area, pretreating effluent from an area measuring 108 km2 with a population of more than two million. Modernising and extending the plant, without interrupting operations, requires a highly complex organisation and schedule that Artelia is overseeing as lead firm in the project management consortium. On completion of five years of works, this plant will comply with the most stringent environmental standards: limited discharges into the river Seine, recovery of heat, HQE (green building) certified buildings, and minimised noise and odour nuisance.


Project characteristics

Surface areas: treatment plant: 15,000 m² - site: 40,000 m²
Pretreatment (screening and degritting) of dry-weather or mild rain-condition effluent (up to 22 m3/s) generated by the Greater Paris sewerage network.

  • Conveyance to the Seine Aval and Seine Centre plants via outfalls CAB and CAA, or potentially outfall CLB for the Seine Aval plant.
  • Pumped conveyance to the Seine Centre and Seine Grésillons plants via the general outfall.
  • Discharge of excess stormwater into the river Seine.
  • Protection of the Greater Paris sewerage network from river Seine floods using a pumping system.