Advantages of Preozonation in the Upgrading of the Mont Valérien Plant in France

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Abstract
The Mont Valérien plant supplies water to the western suburbs of Paris. Raw water comes from the River Seine downstream from the city. The old plant comprised two treatment lines: a slow sand filtration line built 80 years ago and a rapid settling and filtration line built in 1960. The process for the upgraded plant was determined after an in-depth study including industrial-scale experiments and laboratory tests. The new treatment line includes the following: preozonation, oagulationflocculation and settling in a sludge-blanket type settling tank (PULSATOR), rapid gravity sand filtration, ozonation, and granular activated carbon filtration. Results from laboratory tests used for the design are presented: ozonation rate, advantages for the quality of the treated water, expected reagejit savings, etc.

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