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The paper presents the new membrane plant built by the Syndicat des Eaux d’Ile de France(SEDIF) in Merysur-Oise. The drinking water plant is able to produce a maximum of 340,000 m3/d of water (90 MGD) for the North Paris Region. A facility with membrane for 140,000 m3/d (37 MGD) is operated in parallel to the existing conventional plant. The commissioning of the membrane plant took place in 1999 and the first thousand cubic meters of water were provided to the distribution system on September 22, 1999. The paper describes how the 9,120 membrane elements were control-checked before commissioning, and how the integrity of the membrane system has been secured. It emphasises the capability of the pre-treatment to provide good quality water in order to control the fouling of the membranes.

The M&y-sur-Oise membrane facility has produced 140,000 m’ of permeate per day since September 1999. This new facility allows, starting from the highly degraded and variable waters of the Oise, to produce water that is exceptionally pure. The quantity of organic matter is very low and the biodegradable part of its organic matters below the limits of detection of the measuring. The operation of the new facility is ensured by the conventional personnel assisted by a maximum degree of automation. The cost of the entire operation, including the new plant and various adaptations to the conventional plant, is around 130 million Euro excluding VAT. The additional cost of treating water by nanotiltration is estimated at 0.12 Euro C. Ventresque et al. iDesalination J.C. Kruithof, J.C. Schippers, P.C. Kamp, H.C. Folmer and J.A.M.H. Hofman,. Proc., AWWA Annual Conf., D (1998) 387. [IO] B. van der Bruggen, J. Schaep, W. Maes, D. Wilms and C. Vandecasteele, Desalination, 117(1998) 139. [ 1l] Manual of water supply practices. Reverse Osmosis and Nanofiltration, AWWA Manual M46, First