Renovation of the Haliotis wastewater treatment plant

At the cutting edge of the ecological transition.

The Nice Côte d’Azur metropolitan area has decided to completely refurbish its Haliotis wastewater treatment complex to ensure that it is in line with its policy of ecological transition.

It has entrusted a consortium, to which Artelia belongs, with the construction of an exemplary infrastructure that must meet very high environmental standards combining energy sobriety and recovery, preservation of water resources and enhanced landscape integration.


Located in the south of France, Métropole Nice Côte d’Azur has a population of almost 550,000 spread over 51 communes in an area of 1,400 km2. For many years, this inter-municipality has given great importance to the environmental dimension of its development projects. The renovation of the Haliotis wastewater treatment complex was therefore an opportunity to develop a highly ambitious ecological transition programme.

The project includes the implementation of innovative processes for capturing microplastics, treating micropollutants, reducing sludge and reusing wastewater (REUT). It is also at the cutting edge in terms of energy production and efficiency. The future plant aims to produce four times more energy than it consumes, using a range of technologies: a photovoltaic plant, recovery of waste heat, incineration of dried sludge, and production of biomethane for injection into the gas network. Particular care will also be taken to ensure that it fits in with the urban environment. Built on the seafront, close to the Promenade des Anglais, a key tourist attraction, the station will feature extensive green spaces (4.5 hectares, 600 trees) and facilities dedicated to reducing noise and odour pollution. The project is aiming for BREEAM and ECOVALLEE certification.

As part of a consortium led by Suez, Artelia is involved in various aspects of the project, including BIM design, construction supervision, environmental certification and management of contaminated soil.