Saint-Cloud drinking water production plant (France)

Eau de Paris entrusted SUEZ and AAE companies with the design and construction of the latest drinking water refining unit in one of the compartments at the Saint Cloud reservoir.

The water to be treated comes from the Avre aqueduct located in the area of Dreux, France. It is transported via a 102 km-long supply pipeline measuring 1.8m in diameter. Considered as one of the essential components of water supply system to Paris, this unit, with a 100,000 m³/day capacity, guarantees Parisians with quality water thanks to the Cristal® process combined activated carbon and membrane ultrafiltration.

Three industrial buildings with a total surface area of 4,000 m² house this new unit whose hydraulic yield is higher than 99.9%.

treatment processes

treated water line

• reactor for bringing water and powder activated carbon into contact
• feed pumping
• (4 x 1.550 m³/h pumps: 3 + 1 emergency backup)
• 200 microns prefiltration
• ultrafiltration using the Cristal® process: 16 blocks
• disinfection using chlorine
• gravity distribution to reservoirs

dirty water treatment line

• storage of dirty wash water
• lamellar settling
• pumping of settled water
• 200 microns prefiltration
• 2 stage ultrafiltration (3 UF blocks)
• recirculation to the plant inlet

sludge treatment line

• storage of sludge from settling
• sludge thickening
• centrifugal dewatering
• dewatered sludge storage
• sludge discharge to a drying plant

cristal® process

The Cristal® process combines the properties of ultrafiltration membranes and activated carbon. A flourishing technology in water treatment, ultrafiltration consists in using a membrane to physically stop all elements with a size exceeding a value known as the cut-off threshold. Equipped with 18 Ultrazur® blocks of 24 ultrafiltration membrane modules with a cut-off threshold of 0.01µm, the Saint-Cloud plant produces an excellent quality drinking water in terms of both traditional physico-chemical parameters (turbidity, organic matter, etc.) and organolepetic parameters (taste, odour, clarity) as well as germ removal (bacteria, viruses).

a high environmental quality approach

The implementation of an HEQ approach guarantees maximum limitation of noise nuisances in particular by covering works likely to generate noise. Located in a urban zone, particular attention has been paid to landscape and architectural integration in order to maintain a vast green area.